Rotary compressor and refrigeration cycle system

Abstract

The present invention discloses a rotary compressor and a refrigeration cycle system, wherein the rotary compressor includes a casing, a motor, a compression mechanism, an input pipe, an output pipe, and a refrigerant diverter, wherein the motor is arranged in the casing and has a crankshaft, the compression mechanism is arranged in the casing and driven by the crankshaft of the motor, the compression mechanism has a compression chamber, the input pipe is suitable for passing refrigerant, the output pipe is connected to the compression chamber, the refrigerant diverter is located outside the casing, the refrigerant diverter is connected to the input pipe, the refrigerant diverter is connected to the output pipe, and the refrigerant diverter can connect and disconnect the output pipe and the input pipe according to the pressure difference ΔP between the suction pressure and the exhaust pressure of the compression chamber, and when the refrigerant diverter connects the output pipe and the input pipe, the refrigerant in the input pipe is suitable for entering the output pipe through the refrigerant diverter and entering the compression chamber through the output pipe. The rotary compressor of the present invention can reduce manufacturing costs and improve the reliability of temperature control.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a rotary compressor and a refrigeration cycle system having the rotary compressor. Background Art

[0002] Household air conditioners are equipped with rotary compressors and come in two types: dual-purpose cooling and heating, and cooling-only. Dual-purpose cooling and heating air conditioners are used in warm climates, while cooling-only air conditioners are used in tropical and subtropical regions. For cooling-only air conditioners, measures are typically required to prevent compressor overheating and maintain performance. Summary of the Invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] The prior art method for preventing compressor overheating involves detecting the compressor's exhaust temperature and controlling a two-way valve to inject refrigerant. The inventors discovered that this prior art method requires the cost of adding a two-way valve and control, and also lacks high reliability in compressor temperature control.

[0005] To this end, one aspect of the present invention provides a rotary compressor that can reduce manufacturing costs and improve reliability of temperature control.

[0006] Another aspect of the present invention provides a refrigeration cycle system.

[0007] According to an embodiment of the first aspect of the present invention, a rotary compressor includes: a casing; a motor, the motor is arranged in the casing and has a crankshaft; and a compression mechanism, the compression mechanism is arranged in the casing and driven by the crankshaft of the motor, the compression mechanism having a compression chamber; an input pipe, the input pipe is suitable for passing refrigerant; an output pipe, the output pipe is connected to the compression chamber; a refrigerant diverter, the refrigerant diverter is located outside the casing, the refrigerant diverter is connected to the input pipe, the refrigerant diverter is connected to the output pipe, and the refrigerant diverter can connect and disconnect the output pipe and the input pipe according to the pressure difference ΔP between the suction pressure and the exhaust pressure of the compression chamber, and when the refrigerant diverter connects the output pipe and the input pipe, the refrigerant in the input pipe is suitable for entering the output pipe through the refrigerant diverter and entering the compression chamber through the output pipe.

[0008] According to an embodiment of the present invention, a rotary compressor is provided with a refrigerant diverter on the outside of the casing, and refrigerant is transported into the refrigerant diverter via an input pipe. The refrigerant diverter and the compression chamber in the rotary compressor are connected via an output pipe. The refrigerant diverter can open and close the output pipe and the input pipe according to the pressure difference ΔP between the suction pressure and the discharge pressure of the compression chamber. As a result, the rotary compressor of the present invention can automatically control the flow of refrigerant according to the pressure difference ΔP, and the refrigerant diverter has a simple structure. This rotary compressor can reduce manufacturing costs and improve the reliability of temperature control.

[0009] In some embodiments, when the pressure difference ΔP≤K, the refrigerant diverter disconnects the output pipe and the input pipe, and when the pressure difference ΔP>K, the refrigerant diverter connects the output pipe and the input pipe.

[0010] In some embodiments, the refrigerant diverter includes: a first shell, having a first cavity therein, the pressure in the input pipe is the same as the pressure in the casing, the input pipe is connected to the first cavity, the output pipe is connected to the first shell, and the output pipe and the first cavity can be connected and disconnected; a first sliding valve, the first sliding valve is arranged in the first cavity and can be moved in the first cavity along the length direction of the first shell to connect and disconnect the first cavity and the output pipe.

[0011] In some embodiments, the first sliding valve includes a first valve body and a first elastic member. The first valve body is generally cylindrical, and the first end of the first valve body is open. At least a portion of the first elastic member is located in the first valve body. One end of the first elastic member abuts against the inner wall surface of the second end of the first valve body, and the other end of the first elastic member abuts against the inner wall surface of the first end of the first shell. The first elastic member has an elastic force that pushes the first valve body toward the second end of the first shell. The first valve body can move along the length direction of the first shell in the first cavity to connect the output pipe and the first cavity.

[0012] In some embodiments, the input tube is connected to the second end of the first shell, the first shell includes a first side wall section connecting the first end and the second end thereof, and the output tube is connected to the first side wall section.

[0013] In some embodiments, the refrigerant diverter also includes a limit member, which is arranged on the outer wall surface of the second end of the first valve body, and the limit member is located in the first cavity, and the limit member is suitable for abutting and moving away from the inner wall surface of the second end of the first shell.

[0014] In some embodiments, the rotary compressor further includes a high-pressure pipe, which is connected to the refrigerant diverter and the interior of the casing. The refrigerant diverter includes: a second shell, wherein the second shell has a second cavity, the input pipe is connected to the second shell, and the input pipe and the second cavity are connectable and disconnectable, the output pipe is connected to the second shell, and the output pipe and the second cavity are connectable and disconnectable; a second sliding valve, the second sliding valve is arranged in the second cavity and is movable in the second cavity along the length direction of the second shell to connect and disconnect the second cavity and the input pipe and connect and disconnect the second cavity and the output pipe.

[0015] In some embodiments, the second sliding valve includes a second valve body and a second elastic member, the second valve body is generally cylindrical, and the first end of the second valve body is open, the outer circumferential surface of the second valve body is provided with an annular groove, at least part of the second elastic member is located in the second valve body, one end of the second elastic member abuts against the inner wall surface of the second end of the second valve body, and the other end of the second elastic member abuts against the inner wall surface of the first end of the second shell, and the second elastic member has an elastic force that pushes the second valve body toward the second end of the second shell; the second valve body can move along the length direction of the second shell in the second cavity to connect the input pipe and the output pipe through the annular groove.

[0016] In some embodiments, the second shell includes a second side wall section between the first end and the second end thereof, the input pipe and the output pipe are both connected to the second side wall section, and the input pipe and the output pipe are spaced apart in the circumferential direction of the second shell.

[0017] In some embodiments, the compression mechanism is provided with an inlet hole and an injection hole, the inlet hole is connected to the output pipe, and the injection hole is connected to the inlet hole and the compression chamber.

[0018] In some embodiments, the compression mechanism includes: a cylinder having the compression chamber therein; a piston, the piston rotating eccentrically in the compression chamber; a first bearing and a second bearing, the first bearing being arranged at the top of the cylinder and the second bearing being arranged at the bottom of the cylinder, and the crankshaft being rotatably supported by the first bearing and the second bearing.

[0019] In some embodiments, the introduction hole and the injection hole are provided on one of the first bearing and the second bearing.

[0020] In some embodiments, the crankshaft includes a first eccentric portion, a second eccentric portion and an intermediate shaft connected between the first eccentric portion and the second eccentric portion; the cylinder includes a first cylinder and a second cylinder, the first cylinder and the second cylinder both have the compression chamber, a partition is provided between the first cylinder and the second cylinder, the partition is provided with a central cavity passing through the partition along the axial direction of the crankshaft, and at least part of the intermediate shaft is fitted in the central cavity; the piston includes a first piston and a second piston, the first eccentric portion is fitted in the first piston to drive the first piston to rotate eccentrically in the compression chamber of the first cylinder, and the second eccentric portion is fitted in the second piston to drive the second piston to rotate eccentrically in the compression chamber of the second cylinder.

[0021] In some embodiments, the introduction hole and the injection hole are provided on the partition plate, and at least one of the compression chamber of the first cylinder and the compression chamber of the second cylinder is in communication with the injection hole.

[0022] According to an embodiment of the second aspect of the present invention, a refrigeration cycle system includes a compressor, a condenser, an expansion device, an evaporator and a liquid reservoir. The compressor is a rotary compressor described in any one of the above embodiments. The liquid reservoir is connected to the compression chamber through an intake pipe. The refrigeration cycle system also includes a refrigerant injection pipe, which is connected to the condenser and the refrigerant injection pipe is connected to the input pipe.

[0023] The refrigeration cycle system according to an embodiment of the present invention includes a compressor, a condenser, an expansion device, an evaporator and a liquid reservoir, wherein the compressor is a rotary compressor as described in any of the above embodiments, the rotary compressor is provided with a refrigerant diverter on the outside of the casing, and the refrigerant is transported into the refrigerant diverter through an input pipe, the refrigerant diverter and the compression chamber in the rotary compressor are connected through an output pipe, and the refrigerant diverter can open and close the output pipe and the input pipe according to the pressure difference ΔP between the suction pressure and the exhaust pressure of the compression chamber. Thus, the rotary compressor of the present invention can automatically control the introduction of the refrigerant according to the pressure difference ΔP, and the refrigerant diverter has a simple structure. The refrigeration cycle system can reduce manufacturing costs and improve the reliability of temperature control.

[0024] In some embodiments, the refrigeration cycle system further includes a low-pressure pipe, wherein the low-pressure pipe is connected to the refrigerant diverter, and the low-pressure pipe is connected to the intake pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a refrigeration cycle system according to an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 Cross-sectional view of the XX section of the rotary compressor in the refrigeration cycle system.

[0027] Figure 3 yes Figure 1 Schematic diagram of the refrigerant splitter in the refrigeration cycle system.

[0028] Figure 4 yes Figure 1 A cross-sectional view of a refrigerant flow divider in a refrigeration cycle system is shown, with the first sliding valve disconnecting the output pipe and the input pipe.

[0029] Figure 5 yes Figure 1 A cross-sectional view of a refrigerant flow divider in a refrigeration cycle system is shown, with the first sliding valve connecting the output pipe and the input pipe.

[0030] Figure 6 is a schematic diagram of a refrigeration cycle system according to another embodiment of the present invention.

[0031] Figure 7 yes Figure 6 A cross-sectional view of a refrigerant flow divider in a refrigeration cycle system is shown, with the second sliding valve disconnecting the output pipe and the input pipe.

[0032] Figure 8 yes Figure 6 A cross-sectional view of a refrigerant flow divider in a refrigeration cycle system is shown, with the second sliding valve connecting the output pipe and the input pipe.

[0033] Figure 9 is a schematic diagram of a rotary compressor according to one embodiment of the present invention.

[0034] Figure 10 yes Figure 9 A cross-sectional view of the compression mechanism in a rotary compressor.

[0035] Figure 11 This is a characteristic diagram of the three refrigerants R32, R410A, and R22 used in the present invention.

[0036] Reference numerals:

[0037] Rotary compressor 1, casing 2, exhaust pipe 3, motor 4, compression mechanism 5, lubricating oil 8, first bearing 10, plate 10A, inlet hole 11, injection hole 12, muffler 14, second bearing 15, cylinder 20, compression chamber 20A, first cylinder 201, second cylinder 202, partition 203, central cavity 204, suction pipe 21, bypass pipe 23, refrigerant diverter 30, first shell 301, upper opening 3011, first side opening 3012, first cavity 302, first sliding valve 31, first valve body 31a, first elastic member 32, limit member 30 3, second housing 304, second cavity 305, second side opening 3041, third side opening 3042, output pipe 33, input pipe 34a, low-pressure pipe 34b, crankshaft 35, intermediate shaft 35a, first eccentric portion 351, second eccentric portion 352, piston 36, first piston 361, second piston 362, vane 38, accumulator 40, refrigerant injection pipe 45, condenser 50, high-pressure refrigerant diameter 50A, expansion device 51, evaporator 52, second sliding valve 61, second valve body 62, annular groove 621, second elastic member 63, high-pressure pipe 64a. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] The following describes a rotary compressor and a refrigeration cycle system according to embodiments of the present invention with reference to the accompanying drawings.

[0040] like Figures 1-10 As shown, the rotary compressor 1 according to the embodiment of the present invention includes a casing 2 , a motor 4 , a compression mechanism 5 , an input pipe 34 a , an output pipe 33 and a refrigerant splitter 30 .

[0041] The motor 4 is arranged in the housing 2 and has a crankshaft 35. Figure 1 and Figure 2 As shown, the housing 2 extends in the vertical direction. The outer peripheral contour of the cross section of the housing 2 is approximately circular. The housing 2 has a cavity inside. The motor 4 is disposed in the cavity and adjacent to the top of the housing 2. The crankshaft 35 extends in the vertical direction. The upper end of the crankshaft 35 is connected to the motor 4, and the lower end of the crankshaft 35 extends to the bottom of the housing 2 and is spaced apart from the bottom of the housing 2.

[0042] The compression mechanism 5 is disposed in the housing 2 and driven by the crankshaft 35 of the motor 4. The compression mechanism 5 has a compression chamber 20A. Figure 1 As shown, the compression mechanism 5 is disposed inside the casing 2 and adjacent to the bottom of the casing 2. The compression mechanism 5 is connected to the lower end of the crankshaft 35. The compression mechanism 5 has a compression chamber 20A.

[0043] The input pipe 34a is suitable for passing refrigerant, the output pipe 33 is connected to the compression chamber 20A, the refrigerant diverter 30 is located outside the casing 2, the refrigerant diverter 30 is connected to the input pipe 34a, the refrigerant diverter 30 is connected to the output pipe 33, and the refrigerant diverter 30 can connect and disconnect the output pipe 33 and the input pipe 34a according to the pressure difference ΔP between the suction pressure and the exhaust pressure of the compression chamber 20A, and when the refrigerant diverter 30 connects the output pipe 33 and the input pipe 34a, the refrigerant in the input pipe 34a is suitable for entering the output pipe 33 through the refrigerant diverter 30 and entering the compression chamber 20A through the output pipe 33.

[0044] like Figure 1 As shown, the input pipe 34a, the refrigerant diverter 30, and the output pipe 33 are all arranged outside the casing 2. The input pipe 34a is connected to the refrigerant diverter 30 and is suitable for conveying the refrigerant into the refrigerant diverter 30. The output pipe 33 is connected to the refrigerant diverter 30 and the compression chamber 20A. The refrigerant diverter 30 opens and closes the output pipe 33 and the input pipe 34a according to the pressure difference ΔP between the suction pressure and the discharge pressure of the compression chamber 20A. When the refrigerant diverter 30 connects the output pipe 33 and the input pipe 34a, the refrigerant passes through the input pipe 34a, the refrigerant diverter 30, and the output pipe 33 in sequence before entering the compression chamber 20A.

[0045] According to the rotary compressor 1 of the embodiment of the present invention, a refrigerant diverter 30 is provided on the outside of the casing 2, and refrigerant is transported into the refrigerant diverter 30 via an inlet pipe 34a. The refrigerant diverter 30 is connected to the compression chamber 20A in the rotary compressor 1 via an outlet pipe 33. The refrigerant diverter 30 can open and close the outlet pipe and the inlet pipe according to the pressure difference ΔP between the suction pressure and the discharge pressure of the compression chamber 20A. Thus, the rotary compressor 1 of the present invention can automatically control the refrigerant supply according to the pressure difference ΔP, and the refrigerant diverter has a simple structure. This rotary compressor 1 can reduce manufacturing costs and improve the reliability of temperature control.

[0046] In some embodiments, when the pressure difference ΔP≤K, the refrigerant splitter 30 disconnects the output pipe 33 and the input pipe 34a, and when the pressure difference ΔP>K, the refrigerant splitter 30 connects the output pipe 33 and the input pipe 34a.

[0047] like Figure 3-Figure 5 As shown, K is a pre-set safety threshold. When the pressure difference ΔP ≤ K, the refrigerant splitter 30 disconnects the output pipe 33 and the input pipe 34a, and the refrigerant cannot flow into the compression chamber 20A. When the pressure difference ΔP > K, the refrigerant splitter 30 connects the output pipe 33 and the input pipe 34a, and the refrigerant can flow into the compression chamber 20A.

[0048] In some embodiments, the refrigerant flow divider 30 includes a first shell 301 and a first sliding valve 31 .

[0049] The first shell 301 has a first cavity 302 therein, the pressure in the input pipe 34a is the same as the pressure in the casing 2, the input pipe 34a is connected to the first cavity 302, the output pipe 33 is connected to the first shell 301, and the output pipe 33 and the first cavity 302 can be connected and disconnected.

[0050] like Figure 1-Figure 5 As shown, the first housing 301 extends in the vertical direction. The inner circumference of the cross-section of the first housing 301 is approximately circular, and the first housing 301 defines a first cavity 302. An inlet pipe 34a is connected to the first cavity 302, and the pressure within the inlet pipe 34a is the same as the pressure within the housing 2. Thus, refrigerant can flow into the housing 2 through the inlet pipe 34a. The output pipe 33 is connected to the first housing 301, and the output pipe 33 can be connected and disconnected to the first cavity 302.

[0051] The first sliding valve 31 is disposed in the first cavity 302 and is located in the first cavity 302 along the length direction of the first housing 301 (eg Figure 1 The first cavity 302 and the output tube 33 can be moved in the up and down directions to connect and disconnect the first cavity 302 and the output tube 33.

[0052] like Figure 1-Figure 5 As shown, the outer contour of the cross-section of the first sliding valve 31 is approximately circular. The first sliding valve 31 is disposed within the first cavity 302, and the outer circumference of the first sliding valve 31 is tightly fitted with the inner circumference of the first housing 301. The first sliding valve 31 is freely movable vertically within the first cavity 302 to connect and disconnect the first cavity 302 and the output pipe 33.

[0053] In some embodiments, the first sliding valve 31 includes a first valve body 31a and a first elastic member 32. The first valve body 31a is generally cylindrical, and the first end of the first valve body 31a (eg Figure 3 The lower end of the first valve body 31a is opened.

[0054] At least a portion of the first elastic member 32 is located in the first valve body 31a. One end of the first elastic member 32 (eg Figure 3 The upper end of the first elastic member 32) and the second end of the first valve body 31a (such as Figure 3 The other end of the first elastic member 32 (such as the upper end of the first valve body 31a) abuts against the inner wall surface. Figure 3 The lower end of the first elastic member 32) and the first end of the first shell 301 (such as Figure 3 The first elastic member 32 has a second end (such as the lower end of the first shell 301) facing the inner wall surface of the first shell 301. Figure 3The first valve body 31a is movable along the length of the first housing 301 within the first cavity 302 to connect the output pipe 33 with the first cavity 302.

[0055] like Figure 3-Figure 5 As shown, the first valve body 31a is generally cylindrical and includes an upper end and a lower end. The lower side surface of the upper end of the first valve body 31a is connected to the upper side surface of the lower end of the first valve body 31a. The first elastic member 32 is disposed within the first cavity 302. The lower end of the first elastic member 32 is connected to the bottom wall of the first housing 301. The upper end of the first elastic member 32 is located within the lower end of the first valve body 31a, and the upper end of the first elastic member 32 is connected to the lower side surface of the upper end of the first valve body 31a. The first elastic member 32 has an elastic force that pushes the first valve body 31a toward the top wall of the first housing 301. The first valve body 31a can move vertically within the first cavity 302 to connect the output pipe 33 and the first cavity 302.

[0056] In some embodiments, the input tube 34a is connected to the second end of the first shell 301, and the first shell 301 includes a first side wall segment (such as Figure 3 The output pipe 33 is connected to the first side wall section.

[0057] like Figure 3-Figure 5 As shown, an upper opening 3011 is provided on the top wall of the first housing 301. The upper opening 3011 extends vertically through the top wall of the first housing 301, and the inlet pipe 34a is connected to the upper opening 3011. A first side opening 3012 is provided on the peripheral side wall of the first housing 301. The first side opening 3012 extends inwardly through the peripheral side wall of the first housing 301, and the outlet pipe 33 is connected to the first side opening 3012.

[0058] In some embodiments, the refrigerant diverter 30 also includes a limit member 303, which is arranged on the outer wall surface of the second end of the first valve body 31a, and the limit member 303 is located in the first cavity 302. The limit member 303 is suitable for abutting and staying away from the inner wall surface of the second end of the first shell 301.

[0059] like Figure 3-Figure 5 As shown, the stopper 303 is approximately cylindrical and is located on the upper side of the upper end of the first valve body 31a. The extended axis of the stopper 303 coincides with the extended axis of the first valve body 31a. The first valve body 31a drives the stopper 303 to move vertically within the first cavity 302. When the first valve body 31a moves toward the top wall of the first housing 301, the stopper 303 is adapted to abut the top wall of the first housing 301.

[0060] In some embodiments, the rotary compressor 1 further includes a high-pressure pipe 64a, which communicates with the refrigerant diverter 30 and the interior of the casing 2. The refrigerant diverter 30 further includes a second housing 304 and a second sliding valve 61. The second housing 304 defines a second cavity 305. The input pipe 34a is connected to the second housing 304 and can be disconnected from the second cavity 305. The output pipe 33 is connected to the second housing 304 and can be disconnected from the second cavity 305.

[0061] like Figure 6-Figure 8 As shown, a side opening 2a is provided on the peripheral side wall of the casing 2, one end of the high-pressure pipe 64a is connected to the refrigerant diverter 30, and the other end of the high-pressure pipe 64a is connected to the side opening 2a.

[0062] The second housing 304 extends in the vertical direction. The inner circumference of the cross section of the second housing 304 is approximately circular. The second housing 304 has a second cavity 305 inside. The input pipe 34a is connected to the second housing 304 and the second cavity 305 and can be connected and disconnected. The output pipe 33 is connected to the second housing 304 and can be connected and disconnected with the second cavity 305. The second sliding valve 61 is disposed in the second cavity 305 and extends along the length direction of the second housing 304 (such as Figure 6 The upper and lower directions in the middle are movable to connect and disconnect the second cavity 305 and the input pipe 34a and to connect and disconnect the second cavity 305 and the output pipe 33.

[0063] like Figure 6-Figure 8 As shown, the outer circumference of the cross-section of the second sliding valve 61 is approximately circular. The second sliding valve 61 is disposed within the second cavity 305, and the outer circumference of the second sliding valve 61 is in close contact with the inner circumference of the second housing 304. The second sliding valve 61 is freely movable vertically within the second cavity 305 to connect and disconnect the second cavity 305 with the input pipe 34a, and to connect and disconnect the second cavity 305 with the output pipe 33.

[0064] In some embodiments, the second sliding valve 61 includes a second valve body 62 and a second elastic member 63. The second valve body 62 is generally cylindrical, and the first end of the second valve body 62 (such as Figure 7 The lower end of the second valve body 62 is open, and an annular groove 621 is provided on the outer peripheral surface of the second valve body 62.

[0065] At least a portion of the second elastic member 63 is located in the second valve body 62, and one end of the second elastic member 63 (such as Figure 7 The upper end of the second elastic member 63) and the second end of the second valve body 62 (such as Figure 7 The inner wall surface of the second valve body 62 is abutted, and the other end of the second elastic member 63 (such as Figure 7The lower end of the second elastic member 63) and the first end of the second shell 304 (such as Figure 7 The second elastic member 63 has a second end (such as the lower end of the second shell 304) facing the inner wall surface of the second shell 304. Figure 7 The second valve body 62 is pushed by the elastic force of the second housing 304. The second valve body 62 can move along the length direction of the second housing 304 in the second cavity 305 to connect the input pipe 34a and the output pipe 33 through the annular groove 621.

[0066] like Figure 6-Figure 8 As shown, the second valve body 62 is generally cylindrical and includes an upper end and a lower end. An annular groove 621 is provided on the outer peripheral surface of the upper end of the second valve body 62, and the lower side surface of the upper end of the second valve body 62 is connected to the upper side surface of the lower end of the second valve body 62.

[0067] The second elastic member 63 is arranged in the second cavity 305, the lower end of the second elastic member 63 is connected to the bottom wall of the second shell body 304, the upper end of the second elastic member 63 is located inside the lower end portion of the second valve body 62, and the upper end of the second elastic member 63 is connected to the lower side surface of the upper end portion of the second valve body 62. The second elastic member 63 has an elastic force that pushes the second valve body 62 toward the top wall of the second shell body 304. The second valve body 62 can move in the up and down directions in the second cavity 305 to connect the input pipe 34a and the output pipe 33 through the annular groove 621.

[0068] In some embodiments, the second shell 304 includes a second side wall section between its first end and second end, the input pipe 34a and the output pipe 33 are both connected to the second side wall section, and the input pipe 34a and the output pipe 33 are spaced apart in the circumferential direction of the second shell 304.

[0069] like Figure 6-Figure 8 As shown, a second side opening 3041 and a third side opening 3042 are defined on the circumferential side wall of the second housing 304. The second side opening 3041 and the third side opening 3042 are spaced apart in the circumferential direction of the second housing 304. At least a portion of the second side opening 3041 and at least a portion of the third side opening 3042 are located in the same horizontal plane. The inlet pipe 34a is connected to the second side opening 3041, and the outlet pipe 33 is connected to the third side opening 3042. When the second valve body 62 moves vertically within the second cavity 305, at least a portion of the second side opening 3041, at least a portion of the annular groove 621, and at least a portion of the third side opening 3042 can be located in the same horizontal plane, and the annular groove 621 allows communication between the inlet pipe 34a and the outlet pipe 33.

[0070] In some embodiments, the compression mechanism 5 is provided with an inlet hole 11 and an injection hole 12 . The inlet hole 11 is connected to the output pipe 33 , and the injection hole 12 is connected to the inlet hole 11 and the compression chamber 20A.

[0071] like Figure 1 and Figure 2 As shown, an inlet hole 11 is provided on the outer circumferential surface of the compression mechanism 5. The inlet hole 11 extends in the inward-outward direction from the outer circumferential surface of the compression mechanism 5 to the interior of the compression mechanism 5. The inlet hole 11 is connected to the output pipe 33. The injection hole 12 extends in the up-down direction. The upper end of the injection hole 12 is connected to the injection hole 12, and the lower end of the injection hole 12 is connected to the compression chamber 20A. The refrigerant in the refrigerant diverter 30 passes through the output pipe 33, the inlet hole 11, and the injection hole 12 in sequence before entering the compression chamber 20A.

[0072] In some embodiments, the compression mechanism 5 includes a cylinder 20, a piston 36, a first bearing 10, and a second bearing 15. The cylinder 20 defines a compression chamber 20A, and the piston 36 rotates eccentrically within the compression chamber 20A. The first bearing 10 is disposed at the top of the cylinder 20, and the second bearing 15 is disposed at the bottom of the cylinder 20. The crankshaft 35 is rotatably supported by the first bearing 10 and the second bearing 15.

[0073] like Figure 1 As shown, the cylinder 20 is approximately cylindrical, with a circular inner circumference in cross section. A compression chamber 20A is defined within the cylinder 20. The cylinder 20 includes an upper end face and a lower end face. A first bearing 10 is connected to the upper end face of the cylinder 20, while a second bearing 15 is connected to the lower end face of the cylinder 20. The compression chamber 20A is located between the first bearing 10 and the second bearing 15. Both the first bearing 10 and the second bearing 15 have through-holes. The lower end of the crankshaft 35 passes through the through-holes of the first bearing 10 and the second bearing 15, respectively. The first and second bearings 10 and 15 rotatably support the crankshaft 35. A piston 36 is located within the compression chamber 20A and is sleeved on the crankshaft 35. The crankshaft 35 drives the piston 36 to rotate eccentrically within the compression chamber 20A.

[0074] In some embodiments, the introduction hole 11 and the injection hole 12 are provided on one of the first bearing 10 and the second bearing 15 .

[0075] like Figure 1 As shown, the inlet hole 11 and the injection hole 12 are provided on the first bearing 10, the inlet hole 11 extends from the outer peripheral surface of the first bearing 10 to the interior of the first bearing 10 along the inward and outward directions, the injection hole 12 extends along the up and down directions, the upper end of the injection hole 12 is connected to the inlet hole 11, and the lower end of the injection hole 12 is connected to the compression chamber 20A.

[0076] It is understandable that the present invention is not limited thereto. In some optional embodiments, the introduction hole 11 and the injection hole 12 may also be provided on the second bearing 15 .

[0077] In some embodiments, the crankshaft 35 includes a first eccentric portion 351 , a second eccentric portion 352 , and an intermediate shaft 35 a connected between the first eccentric portion 351 and the second eccentric portion 352 .

[0078] The cylinder 20 includes a first cylinder 201 and a second cylinder 202. Each of the first and second cylinders 201 and 202 defines a compression chamber 20A. A partition plate 203 is disposed between the first and second cylinders 201 and 202. The partition plate 203 defines a central cavity 204 extending axially through the partition plate 203 along the crankshaft 35. At least a portion of the intermediate shaft 35a fits within the central cavity 204. The piston 36 includes a first piston 361 and a second piston 362. The first eccentric portion 351 fits within the first piston 361 to drive the first piston 361 to eccentrically rotate within the compression chamber 20A of the first cylinder 201. The second eccentric portion 352 fits within the second piston 362 to drive the second piston 362 to eccentrically rotate within the compression chamber 20A of the second cylinder 202.

[0079] like Figure 9 and Figure 10 As shown, the first cylinder 201 and the second cylinder 202 are arranged vertically spaced apart within the casing 2, with the first cylinder 201 positioned above the second cylinder 202. A partition 203 is disposed between the first and second cylinders 201, 202. The partition 203 defines a central cavity 204 extending vertically through the partition 203. A first eccentric portion 351 is disposed within the first cylinder 201, while a second eccentric portion 352 is disposed within the second cylinder 202. An intermediate shaft 35a extends through the central cavity 204. The upper end of the intermediate shaft 35a is connected to the first eccentric portion 351, while the lower end of the intermediate shaft 35a is connected to the second eccentric portion 352. A first piston 361 is disposed within the first cylinder 201 and sleeved on the first eccentric portion 351. The first eccentric portion 351 drives the first piston 361 to rotate eccentrically within the compression chamber 20A of the first cylinder 201. The second piston 362 is disposed in the second cylinder 202 and sleeved on the second eccentric portion 352 . The second eccentric portion 352 drives the second piston 362 to rotate eccentrically in the compression chamber 20A of the second cylinder 202 .

[0080] In some embodiments, the introduction hole 11 and the injection hole 12 are provided on the partition plate 203 , and at least one of the compression chamber 20A of the first cylinder 201 and the compression chamber 20A of the second cylinder 202 is in communication with the injection hole 12 .

[0081] like Figure 10 As shown, the inlet hole 11 and the injection hole 12 are provided on the partition 203, the inlet hole 11 extends from the outer peripheral surface of the partition 203 to the interior of the partition 203 along the inward and outward directions, the injection hole 12 and the inlet hole 11 are connected and extend along the up and down directions, the upper end of the injection hole 12 is connected to the compression chamber 20A in the first cylinder 201, and the lower end of the injection hole 12 is connected to the compression chamber 20A in the second cylinder 202.

[0082] It will be understood that the present invention is not limited thereto, and in some optional embodiments, the injection hole 12 is only connected to the compression chamber 20A in the first cylinder 201 , or the injection hole 12 is only connected to the compression chamber 20A in the second cylinder 202 .

[0083] like Figure 1 and Figure 6 As shown, a refrigeration cycle system according to an embodiment of the present invention includes a compressor, a condenser 50, an expansion device 51, an evaporator 52, and a liquid accumulator 40. The compressor is a rotary compressor 1 according to any embodiment of the present invention. The liquid accumulator 40 is connected to the compression chamber 20A via the suction pipe 21. The refrigeration cycle system also includes a refrigerant injection pipe 45, which is connected to the condenser 50 and the refrigerant injection pipe 45 is connected to the input pipe 34a.

[0084] like Figure 1 and Figure 6 As shown, the condenser 50, expansion device 51, evaporator 52, liquid reservoir 40, and refrigerant injection pipe 45 are all disposed outside the rotary compressor 1. An opening is provided at the top of the rotary compressor 1, through which the rotary compressor 1 communicates with the inlet of the condenser 50. The outlet of the condenser 50 communicates with the inlet of the expansion device 51 and the inlet of the refrigerant injection pipe 45, respectively. The inlet of the refrigerant injection pipe 45 communicates with the refrigerant diverter 30.

[0085] The outlet of the expansion device 51 is communicated with the inlet of the evaporator 52 , the outlet of the evaporator 52 is communicated with the inlet of the accumulator 40 , and the accumulator 40 is communicated with the compression chamber 20A through the intake pipe 21 .

[0086] The refrigeration cycle system according to an embodiment of the present invention includes a compressor, a condenser 50, an expansion device 51, an evaporator 52 and a liquid accumulator 40, wherein the compressor is the rotary compressor 1 described in any of the above embodiments. The rotary compressor 1 is provided with a refrigerant diverter 30 on the outside of the casing 2, and the refrigerant is transported into the refrigerant diverter 30 through the input pipe 34a. The refrigerant diverter 30 and the compression chamber 20A in the rotary compressor 1 are connected through the output pipe 33. The refrigerant diverter 30 can open and close the output pipe 34a and the input pipe 33 according to the pressure difference ΔP between the suction pressure and the discharge pressure of the compression chamber 20A. Thus, the rotary compressor 1 of the present invention can automatically control the introduction of the refrigerant according to the pressure difference ΔP, and the refrigerant diverter 30 has a simple structure. The refrigeration cycle system can reduce manufacturing costs and improve the reliability of temperature control.

[0087] In some embodiments, the refrigeration cycle system further includes a low-pressure pipe 34 b , which is in communication with the refrigerant splitter 30 and the intake pipe 21 .

[0088] like Figure 1 and Figure 6 As shown, the upper end of the low-pressure pipe 34 b is connected to the refrigerant distributor 30 , and the lower end of the low-pressure pipe 34 b is connected to the intake pipe 21 .

[0089] Please refer to the following Figure 6-10 Some specific exemplary refrigeration cycle systems according to the present invention are described.

[0090] As attached Figure 6-10 As shown, the refrigeration cycle system according to the embodiment of the present invention includes a rotary compressor 1 according to the embodiment of the present invention, a condenser 50, an expansion device 51, an evaporator 52, a liquid accumulator 40 and a refrigerant splitter 30.

[0091] The rotary compressor 1 according to the embodiment of the present invention has an opening at the top, through which the rotary compressor 1 communicates with the inlet of the condenser 50. The outlet of the condenser 50 communicates with the inlet of the expansion device 51 and the inlet of the refrigerant injection pipe 45, respectively. The inlet of the refrigerant injection pipe 45 communicates with the refrigerant diverter 30. The outlet of the expansion device 51 communicates with the inlet of the evaporator 52, which communicates with the inlet of the accumulator 40. The accumulator 40 communicates with the compression chamber 20A via the suction pipe 21, and the refrigerant diverter 30 communicates with the suction pipe 21 via the low-pressure pipe 34b.

[0092] Specifically, the rotary compressor 1 includes a casing 2 , a motor 4 , a compression mechanism 5 and a crankshaft 35 .

[0093] The housing 2 extends vertically, with a cross-sectional outer contour of approximately a circle. The housing 2 defines a cavity within. The motor 4 is disposed within this cavity, adjacent to the top of the housing 2. The crankshaft 35 extends vertically, with the upper end of the crankshaft 35 connected to the motor 4 and the lower end of the crankshaft 35 extending to and spaced apart from the bottom of the housing 2.

[0094] The compression mechanism 5 includes a first bearing 10 , a second bearing 15 , a cylinder 20 , a partition plate 203 , and a piston 36 .

[0095] The cylinder 20 includes a first cylinder 201 and a second cylinder 202. The first cylinder 201 and the second cylinder 202 are arranged in the casing 2 at intervals in the vertical direction. The first cylinder 201 is located above the second cylinder 202. There is a compression chamber 20A in the first cylinder 201 and the second cylinder 202.

[0096] A partition plate 203 is disposed between the first cylinder 201 and the second cylinder 202. The partition plate 203 has a central cavity 204 extending vertically therethrough. The partition plate 203 also has an inlet hole 11 and an injection hole 12. The inlet hole 11 extends inwardly and outwardly from the outer circumference of the partition plate 203 to the interior of the partition plate 203. The injection hole 12 is connected to the inlet hole 11 and extends vertically. The upper end of the injection hole 12 communicates with the compression chamber 20A in the first cylinder 201, and the lower end of the injection hole 12 communicates with the compression chamber 20A in the second cylinder 202.

[0097] The crankshaft 35 includes a first eccentric portion 351, a second eccentric portion 352, and an intermediate shaft 35a. The first eccentric portion 351 is disposed within the first cylinder 201, and the second eccentric portion 352 is disposed within the second cylinder 202. The intermediate shaft 35a extends through the central cavity 204. The upper end of the intermediate shaft 35a is connected to the first eccentric portion 351, and the lower end of the intermediate shaft 35a is connected to the second eccentric portion 352.

[0098] The piston 36 includes a first piston 361 and a second piston 362. The first piston 361 is disposed within the first cylinder 201 and is sleeved on the first eccentric portion 351. The first eccentric portion 351 drives the first piston 361 to rotate eccentrically within the compression chamber 20A of the first cylinder 201. The second piston 362 is disposed within the second cylinder 202 and is sleeved on the second eccentric portion 352. The second eccentric portion 352 drives the second piston 362 to rotate eccentrically within the compression chamber 20A of the second cylinder 202.

[0099] The refrigerant diverter 30 includes a second shell 304 and a second sliding valve 61. A side opening 2a is provided on the peripheral side wall of the casing 2. One end of the high-pressure pipe 64a is connected to the refrigerant diverter 30, and the other end of the high-pressure pipe 64a is connected to the side opening 2a.

[0100] The second shell 304 extends in the vertical direction. The inner circumference of the cross section of the second shell 304 is approximately circular. The second shell 304 has a second cavity 305 inside. The side wall of the second shell 304 is provided with a second side opening 3041 and a third side opening 3042. The second side opening 3041 and the third side opening 3042 are spaced apart in the circumferential direction of the second shell 304. The input pipe 34a is connected to the second side opening 3041, and the output pipe 33 is connected to the third side opening 3042.

[0101] The second sliding valve 61 is disposed in the second cavity 305 . The outer circumference of the second sliding valve 61 is in close contact with the inner circumference of the second housing 304 . The second sliding valve 61 includes a second valve body 62 and a second elastic member 63 .

[0102] The second valve body 62 includes an upper end and a lower end. An annular groove 621 is provided on the outer peripheral surface of the upper end of the second valve body 62 . The lower side surface of the upper end of the second valve body 62 is connected to the upper side surface of the lower end of the second valve body 62 .

[0103] The lower end of the second elastic member 63 is connected to the bottom wall of the second shell body 304, the upper end of the second elastic member 63 is located inside the lower end portion of the second valve body 62, and the upper end of the second elastic member 63 is connected to the lower side surface of the upper end portion of the second valve body 62. The second elastic member 63 has an elastic force that pushes the second valve body 62 toward the top wall of the second shell body 304. The second valve body 62 can move in the up and down directions in the second cavity 305 to connect the input pipe 34a and the output pipe 33 through the annular groove 621.

[0104] Please refer to the following Figure 1-5 Some other specific exemplary refrigeration cycle systems according to the present invention are described.

[0105] As attached Figure 1-5 As shown, the refrigeration cycle system according to the embodiment of the present invention includes a rotary compressor 1 according to the embodiment of the present invention, a condenser 50, an expansion device 51, an evaporator 52, a liquid accumulator 40 and a refrigerant splitter 30.

[0106] The refrigerant diverter 30 includes a first shell 301 and a first sliding valve 31 .

[0107] The first housing 301 extends vertically. The inner circumference of the cross-section of the first housing 301 is approximately circular, and the first housing 301 defines a first cavity 302. An upper opening 3011 is defined on the top wall of the first housing 301. The upper opening 3011 extends vertically through the top wall of the first housing 301, and the inlet pipe 34a is connected to the upper opening 3011. A first side opening 3012 is defined on the side wall of the first housing 301. The first side opening 3012 extends inwardly through the side wall of the first housing 301, and the outlet pipe 33 is connected to the first side opening 3012.

[0108] The outer peripheral contour of the cross section of the first sliding valve 31 is approximately circular. The first sliding valve 31 is disposed in the first cavity 302 . The outer peripheral surface of the first sliding valve 31 is tightly fitted with the inner peripheral surface of the first housing 301 . The first sliding valve 31 includes a first valve body 31 a and a first elastic member 32 .

[0109] The first valve body 31a includes an upper end and a lower end. The lower side of the upper end of the first valve body 31a is connected to the upper side of the lower end of the first valve body 31a. The lower end of the first elastic member 32 is connected to the bottom wall of the first housing 301. The upper end of the first elastic member 32 is located inside the lower end of the first valve body 31a, and the upper end of the first elastic member 32 is connected to the lower side of the upper end of the first valve body 31a. The first elastic member 32 has an elastic force that pushes the first valve body 31a toward the top wall of the first housing 301. The first valve body 31a can move vertically within the first cavity 302 to connect the output pipe 33 and the first cavity 302.

[0110] The limit member 303 is approximately cylindrical and is arranged on the upper side surface of the upper end of the first valve body 31a. The extension line of the axis of the limit member 303 coincides with the extension line of the axis of the first valve body 31a. The first valve body 31a drives the limit member 303 to move in the up and down directions within the first cavity 302.

[0111] Figure 1-Figure 5 Other structures of the refrigeration cycle system shown can be Figures 6-10 The embodiments shown are the same and will not be described in detail here.

[0112] The specific working process of the refrigeration cycle system according to the embodiment of the present invention is as follows:

[0113] The refrigerants used in the present invention include but are not limited to R32, R410A and R22. Among them, R32 is difluoromethane (HFC-32), a halogenated hydrocarbon with the chemical formula CH2F2. R22 is a member of the Freon family and belongs to the hydrochlorofluorocarbon class. As the most widely used medium and low temperature refrigerant today, R22 is widely used in air conditioning systems. On the other hand, in order to improve the global environment, the use of R22 was restricted or banned starting in 1998. R410A is a new environmentally friendly refrigerant. R410A does not damage the ozone layer. The operating pressure of R410A is about 1.6 times that of ordinary R22 air conditioners, and the cooling (heating) efficiency is higher. R410A is composed of two quasi-azeotropic mixtures, mainly composed of hydrogen, fluorine and carbon elements. In terms of global warming potential (GWP), R32 is about 30% of R410A. Since the pressure characteristics of R32 and R410A are similar, it has the advantage of not requiring design changes to the compressor and air conditioner.

[0114] In Example 1, lubricating oil 8 is stored at the bottom of the casing 2, a flat plate 10A is provided on the upper surface of the first bearing 10 in the compression mechanism 5, the flat plate 10A is connected to the inner circumferential surface of the casing 2, the cylinder 20 is connected to the lower surface of the first bearing 10, and the second bearing 15 is connected to the lower surface of the cylinder 20.

[0115] The crankshaft 35 is in sliding engagement with the first bearing 10 and the second bearing 15 . The intermediate shaft 35 a in the crankshaft 35 causes the piston 36 in the compression chamber 20A to rotate eccentrically. The eccentrically rotating piston 36 compresses the low-pressure gas (pressure Ps) flowing from the intake pipe 21 into high-pressure gas (pressure Pd) at a high temperature. The piston 36 discharges the high-pressure gas into the muffler 14 .

[0116] After being discharged from the muffler 14 , the high-pressure gas flows to the lower part of the motor 4 , and the high-pressure gas at this time is heated. After passing through the motor 4 , the high-pressure gas flows to the condenser 50 through the exhaust pipe 3 , and the high-pressure gas in the exhaust pipe 3 condenses in the condenser 50 .

[0117] The refrigerant is passed from the high-pressure refrigerant path 50A into the expansion device 51 for decompression, and the low-pressure gas evaporated in the evaporator 52 flows into the compression chamber 20A through the intake pipe 21 connected to the liquid storage tank 40, so that the refrigeration cycle is established.

[0118] The refrigerant injection pipe 45 is connected to the high-pressure refrigerant path 50A, and can also be connected to the refrigerant outlet of the condenser 50. The expansion device 51 uses an electronic expansion valve or a capillary tube.

[0119] A refrigerant manifold 30 is provided on the outside of the housing 2. An inlet pipe 34a at the upper end and a low-pressure pipe 34b at the lower end of the refrigerant manifold 30 are connected to the refrigerant injection pipe 45 and the suction pipe 21, respectively. The outlet pipe 33 is connected to the inlet hole 11, which is connected to the outer periphery of the flat plate 10A of the first bearing 10. The injection hole 12 is connected to the compression chamber 20A.

[0120] When the compression mechanism 5 is operating, when the pressure difference ΔP between the pressure Pd of the high-pressure refrigerant path 50A, which is equal to the pressure of the casing 2, and the pressure Ps of the intake pipe 21 exceeds the predetermined design value K, that is, ΔP=Pd-Ps>K (MPaG), the output pipe 33 is connected.

[0121] A portion of the refrigerant passing through the high-pressure refrigerant path 50A passes through the refrigerant injection pipe 45 and the refrigerant diverter 30, through the output pipe 33 and the inlet hole 11, and the refrigerant is discharged into the compression chamber 20A from the injection hole 12.

[0122] On the other hand, when ΔP=Pd-Ps≦K, the output pipe 33 of the refrigerant diverter 30 is disconnected, so the refrigerant in the refrigerant injection pipe 45 is stagnant and does not flow, and the low-pressure refrigerant gas temperature of the intake pipe 21 and the internal high-pressure gas temperature of the casing 2 are closely related to the pressure Ps and the pressure Pd, respectively.

[0123] The refrigeration cycle system of the embodiment of the present invention controls the injection of refrigerant into the compression chamber 20A by the refrigerant diverter 30 through the pressure difference ΔP between the gas pressure Ps of the intake pipe 21 and the gas pressure Pd of the casing 2, thereby simplifying the temperature management of the motor 4 and the lubricating oil 8 and improving the reliability of the rotary compressor 1.

[0124] The input pipe 34a of the refrigerant diverter 30 is connected to the refrigerant injection pipe 45, the low-pressure pipe 34b is connected to the intake pipe 21 via the bypass pipe 23, and the output pipe 33 of the refrigerant diverter 30 is connected to the injection hole 12 via the inlet hole 11. The injection hole 12 opens or closes with the eccentric rotation of the piston 36. The injection hole 12 injects liquid refrigerant into the high-temperature gas in the high-pressure chamber divided by the slide 38, so the exhaust temperature of the compression chamber 20A decreases proportionally with the injection amount.

[0125] The upper surface of the refrigerant splitter 30 shell is connected to the input pipe 34a, the lower surface of the refrigerant splitter 30 shell is connected to the low-pressure pipe 34b, and the side of the refrigerant splitter 30 shell is connected to the output pipe 33. A first sliding valve 31 is provided in the first cavity 302, which slides up and down.

[0126] like Figure 4 As shown, when the compression mechanism 5 is in operation, the pressure of the input pipe 34a is Pd, the pressure of the low-pressure pipe 34b is Ps, the pressure difference ΔP=Pd-Ps, ΔP≦K, the output pipe 33 is disconnected.

[0127] like Figure 5 As shown, when ΔP>K, output pipe 33 is open, and the refrigerant in refrigerant injection pipe 45 can flow out of output pipe 33. As ΔP increases, the conductive area of ​​output pipe 33 increases. The pressure K that determines the opening and closing of output pipe 33 is a value determined during the design of rotary compressor 1. The K value can be optimized based on the characteristics of the refrigerant used, the heat generation of motor 4, the viscosity of lubricating oil 8, etc., to ensure the reliability of the compressor.

[0128] like Figure 11 The figure shows the characteristic diagram of three refrigerants: R32, R410A and R22. The horizontal axis represents the gas temperature T (°C) and the vertical axis represents the pressure P (MPaG).

[0129] R410A is composed of 50% R32 and the remaining 50% azeotropic refrigerant R125. Compared to R22, R32 and R410A have a larger pressure slip (P / T), the ratio of gas pressure P to gas temperature. Using R32 or R410A increases the sensitivity of the refrigerant manifold 30 and improves temperature control accuracy.

[0130] For example, assuming that the suction temperature T of the compression chamber 20A is 10°C and the exhaust temperature of the compression chamber 20A is 56°C when the air conditioner is operating stably under cooling conditions, since ΔP=Pd-Ps=2.2<K, the output pipe 33 is disconnected and the liquid refrigerant is not sprayed into the compression chamber 20A.

[0131] On the other hand, assuming that the intake temperature T is 10°C and the exhaust temperature T rises to 70°C, at this time K=3.4, ΔP>K, so the output pipe 33 is connected, and the refrigerant with a high-pressure refrigerant diameter of 50A is sprayed into the compression chamber 20A from the refrigerant injection pipe 45 through the refrigerant diverter 30.

[0132] In addition, if the value of K is further increased, the amount of refrigerant sprayed out of the injection hole 12 increases proportionally with the value of K. However, since the maximum conduction area of ​​the output pipe 33 and the aperture of the injection hole 12 can be designed according to actual conditions, the refrigerant will not flow out excessively.

[0133] In Example 2, Figure 6-Figure 8 As shown, the refrigerant in the refrigerant injection pipe 45 can flow into the introduction hole 11 through the inlet pipe 34 a and the outlet pipe 33 of the refrigerant splitter 30 .

[0134] The high-pressure pipe 64a is connected to the side of the casing 2, and the low-pressure pipe 34b is connected to the intake pipe 21. The pressure of the high-pressure pipe 64a is equal to the internal pressure of the shell 2, and the internal pressure of the shell 2 is equal to the pressure of the high-pressure refrigerant diameter 50A.

[0135] The input pipe 34 a and the output pipe 33 are located on the side of the second housing 304 . The second sliding valve 61 sliding inside the second housing 304 has an annular groove 621 that moves up and down according to the pressure difference ΔP between the high-pressure pipe 64 a and the low-pressure pipe 64 b. The annular groove 621 opens or closes the input pipe 34 a and the output pipe 33.

[0136] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0137] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0138] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0139] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0140] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0141] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rotary compressor, characterized in that: include: chassis; a motor, the motor being disposed in the housing and having a crankshaft; and a compression mechanism, the compression mechanism being disposed in the housing and driven by the crankshaft of the motor, the compression mechanism having a compression chamber; an input pipe, wherein the input pipe is suitable for introducing a refrigerant; an output pipe, the output pipe being in communication with the compression chamber; a refrigerant diverter, the refrigerant diverter being located outside the casing, the refrigerant diverter being connected to the input pipe, the refrigerant diverter being connected to the output pipe, and the refrigerant diverter being capable of connecting and disconnecting the output pipe and the input pipe according to a pressure difference ΔP between a suction pressure and a discharge pressure of the compression chamber, and when the refrigerant diverter connects the output pipe and the input pipe, the refrigerant in the input pipe is adapted to pass through the refrigerant diverter into the output pipe and then into the compression chamber via the output pipe; The refrigerant diverter includes: a first shell, wherein the first shell has a first cavity therein, the pressure in the input pipe is the same as the pressure in the housing, the input pipe is in communication with the first cavity, the output pipe is connected to the first shell, and the output pipe and the first cavity are connectable and disconnectable; A first sliding valve is provided in the first cavity and is movable in the first cavity along the length direction of the first shell to connect and disconnect the first cavity and the output pipe.

2. The rotary compressor according to claim 1, characterized in that When the pressure difference ΔP≤K, the refrigerant diverter disconnects the output pipe and the input pipe, and when the pressure difference ΔP>K, the refrigerant diverter connects the output pipe and the input pipe.

3. The rotary compressor according to claim 1, wherein The first sliding valve includes a first valve body and a first elastic member. The first valve body is generally cylindrical, and the first end of the first valve body is open. At least a portion of the first elastic member is located in the first valve body. One end of the first elastic member abuts against the inner wall surface of the second end of the first valve body, and the other end of the first elastic member abuts against the inner wall surface of the first end of the first housing. The first elastic member has an elastic force that pushes the first valve body toward the second end of the first housing. The first valve body is movable in the first cavity along the length direction of the first shell to connect the output pipe and the first cavity.

4. The rotary compressor according to claim 3, characterized in that The input pipe is connected to the second end of the first shell, the first shell includes a first side wall section connecting the first end and the second end thereof, and the output pipe is connected to the first side wall section.

5. The rotary compressor according to claim 3, characterized in that The refrigerant diverter also includes a limiter, which is provided on the outer wall surface of the second end of the first valve body and is located in the first cavity. The limiter is suitable for abutting and moving away from the inner wall surface of the second end of the first shell.

6. The rotary compressor according to claim 1, characterized in that The refrigerant flow divider further comprises a high-pressure pipe, the high-pressure pipe being in communication with the refrigerant flow divider and the interior of the housing, the refrigerant flow divider comprising: a second shell, the second shell replacing the first shell, the second shell having a second cavity therein, the input tube connected to the second shell and being connectable and disconnectable to the second cavity, and the output tube connected to the second shell and being connectable and disconnectable to the second cavity; a second sliding valve, which replaces the first sliding valve; the second sliding valve is disposed in the second cavity and is movable in the second cavity along the length direction of the second housing to connect and disconnect the second cavity and the input pipe and connect and disconnect the second cavity and the output pipe.

7. The rotary compressor according to claim 6, characterized in that The second sliding valve includes a second valve body and a second elastic member. The second valve body is generally cylindrical, and the first end of the second valve body is open. An annular groove is provided on the outer circumferential surface of the second valve body. At least a portion of the second elastic member is located in the second valve body. One end of the second elastic member abuts against the inner wall surface of the second end of the second valve body, and the other end of the second elastic member abuts against the inner wall surface of the first end of the second housing. The second elastic member has an elastic force that pushes the second valve body toward the second end of the second housing. The second valve body is movable in the second cavity along the length direction of the second housing to connect the input pipe and the output pipe through the annular groove.

8. The rotary compressor according to claim 7, characterized in that The second shell includes a second side wall section between the first end and the second end thereof. The input pipe and the output pipe are both connected to the second side wall section, and the input pipe and the output pipe are spaced apart in the circumferential direction of the second shell.

9. The rotary compressor according to any one of claims 1 to 8, characterized in that: The compression mechanism is provided with an introduction hole and an injection hole. The introduction hole is communicated with the output pipe, and the injection hole is communicated with the introduction hole and the compression chamber.

10. The rotary compressor according to claim 9, characterized in that The compression mechanism comprises: a cylinder, wherein the compression chamber is provided in the cylinder; a piston, the piston rotating eccentrically within the compression chamber; a first bearing and a second bearing, wherein the first bearing is provided at the top of the cylinder and the second bearing is provided at the bottom of the cylinder, and the crankshaft is rotatably supported by the first bearing and the second bearing.

11. The rotary compressor according to claim 10, characterized in that The introduction hole and the injection hole are provided on one of the first bearing and the second bearing.

12. The rotary compressor according to claim 10, characterized in that The crankshaft includes a first eccentric portion, a second eccentric portion, and an intermediate shaft connected between the first eccentric portion and the second eccentric portion. The cylinder includes a first cylinder and a second cylinder, each of the first cylinder and the second cylinder has the compression chamber, a partition is provided between the first cylinder and the second cylinder, the partition has a central cavity extending through the partition along the axial direction of the crankshaft, and at least a portion of the intermediate shaft is fitted in the central cavity; The piston includes a first piston and a second piston. The first eccentric portion is engaged in the first piston to drive the first piston to rotate eccentrically in the compression chamber of the first cylinder. The second eccentric portion is engaged in the second piston to drive the second piston to rotate eccentrically in the compression chamber of the second cylinder.

13. The rotary compressor according to claim 12, characterized in that The introduction hole and the injection hole are provided on the partition plate, and at least one of the compression chamber of the first cylinder and the compression chamber of the second cylinder is communicated with the injection hole.

14. A refrigeration cycle system, characterized in that: The refrigeration cycle system includes a compressor, a condenser, an expansion device, an evaporator and a liquid reservoir. The compressor is a rotary compressor according to any one of claims 1 to 13. The liquid reservoir is connected to the compression chamber through an intake pipe. The refrigeration cycle system also includes a refrigerant injection pipe, which is connected to the condenser and the input pipe.

15. The refrigeration cycle system according to claim 14, characterized in that: It also includes a low-pressure pipe, which is connected to the refrigerant diverter and the intake pipe.

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