Square linear compressor

Abstract

The present invention relates to the technical field of linear compressors, and discloses a square linear compressor, which includes a machine base, a square linear oscillating motor, and a plurality of cylinder-piston assemblies. The square linear oscillating motor includes a stator component and a rotor component. The stator component is fixedly connected to the machine base, and one end of the rotor component is inserted into the air gap formed by the stator component; the cylinder-piston assembly includes a piston and a cylinder. The cylinder is fixedly connected to the machine base, and the end of the piston is flexibly connected to the other end of the rotor component; the front end of the piston is movably installed in the cylinder in a reciprocating manner, and the front end wall surface of the piston and the cylinder enclose a compression chamber, and a suction valve is installed on the front end wall surface of the piston; at least one piston is provided with a suction hole, and at least one compression chamber of the cylinder is provided with an exhaust valve. This square linear compressor realizes the circumferential positioning of the square rotor component by flexibly connecting a plurality of cylinder-piston assemblies to the rotor component, which can prevent the circumferential rotation of the rotor component of the square linear motor and avoid causing the rotor to jam.

Description

Technical Field

[0001] The present invention relates to the technical field of linear compressors, and particularly to a square linear compressor. Background Art

[0002] An air compressor is a fluid machine that converts the mechanical energy of a prime mover into the energy of a gas, used to pressurize and transport the gas. A traditional piston-type air compressor is mainly driven by a rotating motor. The rotational motion of the rotor of the rotating motor is converted into the reciprocating linear motion of a piston through a crank, a connecting rod slider, and a piston rod. This type of compressor has a complex structure, many vulnerable parts, and low mechanical efficiency.

[0003] In 1992, Beale and Redlich in the United States proposed a moving magnet linear oscillating motor of the Redlich type structure. This type of moving magnet linear oscillating motor has a magnetic circuit structure in which a magnetic conductive material is installed on the circumference of an excitation coil to form a cylindrical air gap concentric with the excitation coil. The air gap is composed of a cylindrical inner stator and an outer stator, and a radially magnetized cylindrical permanent magnet reciprocates in the air gap. The Redlich type structure linear motor has the advantages of a relatively optimal magnetic circuit structure design and small magnetic circuit losses. The existing technical application uses a cylindrical linear oscillating motor of the Redlich structure as a driver, and a cylinder and a piston component are arranged inside the cylinder of the inner stator. This structure causes the heat generated during the gas compression process of the linear compressor and the heat generated by the motor itself to affect each other, affecting the compression efficiency. At the same time, the overall structure of the compressor is biased towards being short and tall. The shape characteristic of this cylindrical structure compressor is a small aspect ratio of length to diameter, and it is biased towards being short and tall. It is also more difficult to assemble the inner and outer stators radially on the circumference.

[0004] For some small refrigeration devices, especially equipment such as refrigerators and cold storage boxes, a square linear compressor with a low height, horizontal, and slender shape occupies less space and can increase the effective usable space of the equipment. However, when the square linear compressor bears a load during operation, the mover component will rotate circumferentially, causing wear on the contact surface and resulting in structural instability. Summary of the Invention

[0005] An embodiment of the present invention provides a square linear compressor to solve the problem that the mover component of the existing square linear compressor is prone to circumferential rotation, resulting in wear on the contact surface and structural instability.

[0006] An embodiment of the present invention provides a square linear compressor, including a machine base, a square linear oscillating motor, and a plurality of cylinder-piston assemblies. The square linear oscillating motor includes a stator component and a mover component. The stator component is fixedly connected to the machine base, and one end of the mover component is inserted into the air gap formed by the stator component.

[0007] The cylinder piston assembly includes a piston and a cylinder. The cylinder is fixedly connected to the machine base, and the end of the piston is flexibly connected to the other end of the mover component. The front end of the piston is movably installed in the cylinder. The front end wall surface of the piston and the cylinder enclose a compression chamber, and an intake valve is installed on the front end wall surface of the piston. At least one of the pistons is provided with an intake hole, and at least one of the compression chambers of the cylinders is provided with an exhaust valve, so that gas enters the compression chamber through the intake hole and is compressed and then discharged from the cylinder through the exhaust valve.

[0008] Among them, n cylinder piston assemblies in a plurality of the cylinder piston assemblies are sequentially connected to form an n-stage compression mechanism, where n is an integer greater than or equal to 2.

[0009] The front end of the nth-stage piston of the nth-stage cylinder piston assembly divides the interior of the nth-stage cylinder into an nth-stage intake chamber and an nth-stage compression chamber, and the front end of the nth-stage piston is provided with a through hole to communicate the nth-stage intake chamber and the nth-stage compression chamber. The compressed gas in the nth-stage compression chamber is discharged through the nth-stage exhaust valve.

[0010] When n is greater than 2, the front end of the (n - 1)th-stage piston of the (n - 1)th-stage cylinder piston assembly divides the interior of the (n - 1)th-stage cylinder into an (n - 1)th-stage intake chamber and an (n - 1)th-stage compression chamber, and the front end of the (n - 1)th-stage piston is provided with a through hole to communicate the (n - 1)th-stage intake chamber and the (n - 1)th-stage compression chamber. The (n - 1)th-stage compression chamber is communicated to a closed (n - 1)th-stage exhaust chamber through the (n - 1)th-stage exhaust valve. The (n - 1)th-stage exhaust chamber is communicated to the nth-stage intake chamber through the nth-stage intake passage.

[0011] The front end wall surface of the first-stage piston of the first-stage cylinder piston assembly and the first-stage cylinder enclose a first-stage compression chamber. The first-stage piston is provided with the intake hole, so that gas enters the first-stage compression chamber through the intake hole. The first-stage compression chamber is communicated to a closed first-stage exhaust chamber through the first-stage exhaust valve. The first-stage exhaust chamber is communicated to the second-stage intake chamber through the second-stage intake passage.

[0012] Among them, at least one of the plurality of cylinder piston assemblies is a single-stage compression cylinder piston assembly. The single-stage compression cylinder piston assembly includes a single-stage piston and a single-stage cylinder. The single-stage piston is provided with the intake hole, and the compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve, so that gas enters the compression chamber of the single-stage cylinder through the intake hole and is compressed and then discharged from the single-stage cylinder through the single-stage exhaust valve.

[0013] Among them, at least one of the multiple cylinder piston assemblies is a gas spring cylinder piston assembly. The gas spring compression cylinder piston assembly includes a gas spring piston and a gas spring cylinder. The gas spring piston is provided with the suction hole. The compression chamber of the gas spring cylinder is a closed cavity, so that gas enters the compression chamber of the gas spring cylinder through the suction hole and forms a gas spring after being compressed.

[0014] Among them, the stator component includes two E-shaped intermediate magnetic conductor stators, two side magnetic conductor stators and a coil winding; the openings of the two intermediate magnetic conductor stators are arranged oppositely, and the coil winding is sleeved in the openings of the two intermediate magnetic conductor stators; the two side magnetic conductor stators are respectively arranged on both sides of the intermediate magnetic conductor stator at intervals to form two groups of the air gaps.

[0015] The rotor component includes two sheet-shaped permanent magnets respectively inserted into the air gaps.

[0016] Among them, the rotor component further includes a rotor bracket. The two sheet-shaped permanent magnets are installed at both ends of one side of the rotor bracket in parallel; one side of the rotor bracket is connected to the stator component through a first resonance spring, and the other side of the rotor bracket is connected to the cylinder through a second resonance spring. The axes of the first resonance spring and the second resonance spring are parallel to each other.

[0017] Among them, the outer edge of the rotor bracket is provided with a spring positioning flange for installing the first resonance spring, and the middle part of the rotor bracket is provided with a spring positioning recess for installing the second resonance spring.

[0018] Among them, the suction valve is a suction valve plate fixedly connected to the front end wall surface of the piston; one end of the exhaust valve abuts against the exhaust port of the compression chamber, and the other end of the exhaust valve is connected to the cylinder through a pre-tightening spring.

[0019] Among them, an oil pump is further included, and the oil pump is used to pump lubricating oil to the moving interfaces of the cylinder and the piston.

[0020] Among them, the flexible connection method between the piston and the rotor component includes piston pin connection, ball head connection or elastic threaded screw rod connection.

[0021] The square linear compressor provided by an embodiment of the present invention includes a machine base, a square linear oscillating motor, and multiple cylinder-piston assemblies. The mover component of the square linear oscillating motor is inserted into the air gap formed by the stator component, and the mover component is driven to reciprocate by electromagnetic force. The number of cylinder-piston assemblies is at least two, and each cylinder-piston assembly includes a piston and a cylinder. The end of the piston is flexibly connected to the mover component, and the front end of the piston is reciprocally movably installed in the cylinder to transmit the reciprocating motion of the mover component to the piston to generate compressed gas. At the same time, at least two pistons are flexibly connected to the mover component to achieve circumferential positioning of the square mover component. This square linear compressor realizes the circumferential positioning of the square mover component by flexibly connecting multiple cylinder-piston assemblies to the mover component, which can prevent the circumferential rotation of the mover component of the square linear motor and avoid the jamming of the mover, so as to improve the structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a cross-sectional view of a square linear compressor in a top view angle in an embodiment of the present invention;

[0024] Figure 2 is Figure 1 the front view of the square linear compressor in

[0025] Figure 3 is Figure 1 the cross-sectional view of the square linear compressor in a front view angle in

[0026] Figure 4 is a cross-sectional view of another square linear compressor in a top view angle in an embodiment of the present invention;

[0027] Figure 5 is Figure 4 the front view of the square linear compressor in

[0028] Figure 6 is Figure 4 the cross-sectional view of the square linear compressor in a front view angle in

[0029] Figure 7 is a cross-sectional view of yet another square linear compressor in a top view angle in an embodiment of the present invention;

[0030] Figure 8 is Figure 7Front view of the square linear compressor in

[0031] Figure 9 is Figure 7 Cross-sectional view of the square linear compressor in the front view angle in

[0032] Explanation of reference numerals:

[0033] 1, Base; 2, Intermediate magnetic conductor stator; 3, Side magnetic conductor stator;

[0034] 4, Coil winding; 5, Air gap; 6, Permanent magnet;

[0035] 7, Rotor bracket; 8, First resonance spring; 9, Second resonance spring;

[0036] 10, Oil pump; 11, Piston pin; 12, Suction hole;

[0037] 13, First-stage cylinder piston assembly; 131, First-stage cylinder;

[0038] 132, First-stage piston; 133, First-stage compression chamber; 134, First-stage exhaust valve;

[0039] 135, First-stage cylinder head; 136, First-stage suction valve; 137, First-stage preloading spring;

[0040] 138, First-stage exhaust chamber;

[0041] 14, Second-stage cylinder piston assembly; 141, Second-stage cylinder;

[0042] 142, Second-stage piston; 143, Second-stage compression chamber; 144, Second-stage exhaust valve;

[0043] 145, Second-stage cylinder head; 146, Second-stage suction valve; 147, Second-stage preloading spring;

[0044] 148, Second-stage exhaust chamber; 149, Second-stage suction passage 140, Second-stage suction chamber;

[0045] 15, Oil supply passage; 16, First single-stage cylinder; 17, Second single-stage cylinder;

[0046] 18, First single-stage piston; 19, Second single-stage piston; 20, Single-stage suction valve;

[0047] 21, Single-stage exhaust valve; 22, Single-stage preloading spring; 23, Single-stage exhaust chamber;

[0048] 24, Single-stage cylinder head; 25, Gas spring cylinder; 26, Gas spring piston;

[0049] 27. Gas spring suction valve. Specific implementation manner

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "first" and "second" are used for numbering product components for clear description and do not represent any substantial difference. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] It should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the invention can be understood according to specific circumstances.

[0053] As Figures 1 to 9 shown, a square linear compressor provided by an embodiment of the present invention includes a machine base 1, a square linear oscillating motor, and a plurality of cylinder piston assemblies. The square linear oscillating motor includes a stator component and a rotor component. The stator component is fixedly connected to the machine base 1, and one end of the rotor component is inserted into the air gap 5 formed by the stator component. Specifically, the machine base 1 includes a bottom plate and three parallel vertical plates standing on the bottom plate. The two left vertical plates are used to fix the square linear oscillating motor, and the one right vertical plate is used to fix the plurality of cylinder piston assemblies. The outer shape of the square linear oscillating motor is rectangular, which can meet the space utilization requirements of some small refrigeration devices, such as low-height horizontal devices like refrigerators and refrigerated cabinets. At the same time, compared with the internal and external stators of a cylindrical motor that need to be radially assembled on the circumference respectively, the assembly of the square linear oscillating motor is simpler. The square linear oscillating motor mainly uses electromagnetic force to generate vibration, and then combines mechanical resonance to push the piston to reciprocate and compress the gas. The square linear oscillating motor can adopt a moving magnet type, a moving coil type, or a moving iron type. In this embodiment, the moving magnet type is mainly used as an example for description.

[0054] The number of cylinder piston assemblies is greater than or equal to two. There can be various arrangements for multiple cylinder piston assemblies. For example, two cylinder piston assemblies are arranged along the length direction or height direction of the square linear oscillating motor, or three or more cylinder piston assemblies are arranged in a circular shape or collinearly. The specific arrangement can be designed according to actual usage requirements and is not limited here as long as the axial direction of the piston is parallel to the movement direction of the mover component. Compared with the existing square linear compressor that only has a single cylinder piston assembly at the central axis, when the square linear motor has unstable circumferential rotation, in this embodiment, by setting multiple cylinder piston assemblies, a reverse torque can be generated to prevent the mover component from having circumferential rotation and make the motor operate more stably.

[0055] The cylinder piston assembly includes a piston and a cylinder. The cylinder is fixedly connected to the machine base 1, and the end of the piston is flexibly connected to the other end of the mover component to prevent the mover of the square linear oscillating motor from getting stuck. The flexible connection methods here include piston pin 11 connection, ball joint connection, or elastic threaded screw rod connection, etc. Elastic threaded screw rod connection is to process a spring wire into a screw rod form. In this embodiment, the piston pin 11 connection is taken as an example for illustration. As Figure 3 shown, both ends of the piston pin 11 are fixed to the mover component by threads, and the end of the piston is sleeved on the middle part of the piston pin 11 and can rotate around the axis of the piston pin 11. Therefore, when the linear oscillating motor has circumferential deflection, it can prevent getting stuck through flexible connections such as the piston pin 11.

[0056] The front end of the piston is reciprocally movably installed in the cylinder. The front end wall surface of the piston and the cylinder enclose a compression chamber, and a suction valve is installed on the front end wall surface of the piston. When the piston moves towards the mover component, a certain negative pressure is formed in the cylinder, and the suction valve opens, and the gas enters the compression chamber through the suction valve; when the piston moves away from the mover component, after the gas in the compression chamber is compressed by the piston, the gas pressure rises. When the pressure reaches a certain value, the exhaust valve opens, and the gas is discharged out of the compression chamber.

[0057] Among multiple cylinder piston assemblies, at least one piston of the cylinder piston assembly is provided with a suction hole, and at least one compression chamber of the cylinder of the cylinder piston assembly is provided with an exhaust valve, so that the gas enters the compression chamber through the suction hole and is compressed and then discharged from the cylinder through the exhaust valve. The cylinder piston assembly can have various forms. For example, it can form a single-cylinder single-stage compression structure, a multi-cylinder single-stage compression structure, a multi-cylinder multi-stage compression structure, or a gas spring resonance structure, etc. The multiple cylinder piston assemblies in this embodiment can be freely arranged and combined by the above various forms of structures as long as the number of cylinder piston assemblies is greater than or equal to two.

[0058] A square linear compressor provided in this embodiment includes a base, a square linear oscillating motor, and multiple cylinder-piston assemblies. The mover component of the square linear oscillating motor is inserted into the air gap formed by the stator component, and the mover component is driven to reciprocate by electromagnetic force. The number of cylinder-piston assemblies is at least two. Each cylinder-piston assembly includes a piston and a cylinder. The end of the piston is flexibly connected to the mover component, and the front end of the piston is reciprocally movably installed in the cylinder to transmit the reciprocating motion of the mover component to the piston to generate compressed gas. At the same time, at least two pistons are flexibly connected to the mover component to achieve circumferential positioning of the square mover component. This square linear compressor realizes the circumferential positioning of the square mover component by flexibly connecting multiple cylinder-piston assemblies to the mover component, which can prevent the circumferential rotation of the mover component of the square linear motor and avoid the jamming of the mover, so as to improve the structural stability.

[0059] Further, as Figures 1 to 3 shown, n cylinder-piston assemblies among multiple cylinder-piston assemblies are sequentially connected to form an n-stage compression mechanism, where n is an integer greater than or equal to 2;

[0060] The front end of the nth-stage piston of the nth-stage cylinder-piston assembly divides the interior of the nth-stage cylinder into an nth-stage suction chamber and an nth-stage compression chamber, and the front end of the nth-stage piston is provided with a through hole to communicate the nth-stage suction chamber and the nth-stage compression chamber; the nth-stage compression chamber discharges the compressed gas through the nth-stage exhaust valve.

[0061] When n is greater than 2, the front end of the (n - 1)th-stage piston of the (n - 1)th-stage cylinder-piston assembly divides the interior of the (n - 1)th-stage cylinder into an (n - 1)th-stage suction chamber and an (n - 1)th-stage compression chamber, and the front end of the (n - 1)th-stage piston is provided with a through hole to communicate the (n - 1)th-stage suction chamber and the (n - 1)th-stage compression chamber; the (n - 1)th-stage compression chamber is communicated to the closed (n - 1)th-stage exhaust chamber through the (n - 1)th-stage exhaust valve; the (n - 1)th-stage exhaust chamber is communicated to the nth-stage suction chamber through the nth-stage suction passage; when n is greater than 2, the second-stage to the (n - 1)th-stage cylinder-piston assemblies are all the same.

[0062] When n = 2, there are only two-stage cylinder-piston assemblies, namely the first stage and the second stage, and the second stage is the nth stage.

[0063] The front end wall surface of the first-stage piston 132 of the first-stage cylinder-piston assembly 13 and the first-stage cylinder 131 enclose a first-stage compression chamber 133. The first-stage piston 132 is provided with a suction hole 12 to enable gas to enter the first-stage compression chamber 133 through the suction hole 12; the first-stage compression chamber 133 is communicated to the closed first-stage exhaust chamber 138 through the first-stage exhaust valve 134; the first-stage exhaust chamber 138 is communicated to the second-stage suction chamber 140 through the second-stage suction passage 149.

[0064] As Figures 1 to 3As shown, this embodiment is specifically described by taking n=2 as an example.

[0065] The first-stage cylinder piston assembly 13 includes a first-stage cylinder 131, a first-stage piston 132, a first-stage compression chamber 133, a first-stage exhaust valve 134, a first-stage cylinder head 135, a first-stage intake valve 136, a first-stage preload spring 137 and a first-stage exhaust chamber 138. The first-stage cylinder 131 can be a cylinder with both ends open. The right end of the first-stage cylinder 131 is fixedly connected with a closed first-stage cylinder head 135 to form a closed first-stage exhaust chamber 138. The first-stage exhaust valve 134 is pressed against the right end opening of the first-stage cylinder 131 by a first-stage preload spring 137 installed on the inner wall of the first-stage cylinder head 135. The first-stage preload spring 137 can be a conical spring, a column spring or a leaf spring. The first stage piston 132 may be stepped, the front end diameter of the first stage piston 132 is larger than the rear end diameter, and the front end wall of the first stage piston 132 , the first stage cylinder 131 and the first stage exhaust valve 134 together enclose a first stage compression chamber 133 .

[0066] The first-stage suction valve 136 is located in the first-stage compression chamber 133 and can be in the form of a suction valve plate, on which a suction port is provided. The size of the suction valve plate can be slightly larger than the inner diameter of the first-stage cylinder 131, and the suction valve plate has a certain degree of flexibility. One end of the suction valve plate is fixedly connected to the first-stage piston 132, and the other end of the suction valve plate can be attached to or away from the first-stage piston 132 as the first-stage piston 132 reciprocates, and the position of the suction hole 12 of the first-stage piston 132 corresponds to the closed valve body part on the suction valve plate, staggered from the suction port, so that when the suction valve plate is attached to the first-stage piston 132, the suction hole 12 is blocked, and the suction valve plate is in a closed state; when the other end of the suction valve plate is away from the first-stage piston 132, the suction hole 12 is opened, and the suction valve plate is in an open state. When the first-stage piston 132 moves to the left, the gas enters the first-stage compression chamber 133 through the suction hole 12 and the suction port of the suction valve plate; when the first-stage piston 132 moves to the right, the suction valve plate is close to the front end wall of the first-stage piston 132, thereby blocking the suction hole 12, and the gas in the first-stage compression chamber 133 is compressed; until the pressure in the first-stage compression chamber 133 exceeds the preload force of the first-stage preload spring 137, the first-stage exhaust valve 134 is pushed open, and the compressed gas enters the first-stage exhaust chamber 138.

[0067] The second-stage cylinder piston assembly 14 includes a second-stage cylinder 141, a second-stage piston 142, a second-stage compression chamber 143, a second-stage exhaust valve 144, a second-stage cylinder head 145, a second-stage suction valve 146, a second-stage pre-tightening spring 147, a second-stage exhaust chamber 148, a second-stage suction passage 149, and a second-stage suction chamber 140. The second-stage cylinder 141 is a cylinder with a closed left end and an open right end, and the second-stage cylinder 141 can share a cylinder wall with the first-stage cylinder 131. The right end of the second-stage cylinder 141 is fixedly connected to the second-stage cylinder head 145, and the second-stage cylinder head 145 is provided with an exhaust port for outputting compressed air. The second-stage exhaust valve 144 is pressed against the right-end opening of the second-stage cylinder 141 by the second-stage pre-tightening spring 147 installed on the inner wall of the second-stage cylinder head 145, and the second-stage pre-tightening spring 147 can be a conical spring, a cylindrical spring, or a leaf spring.

[0068] The second-stage piston 142 is also stepped. However, different from the first-stage piston 132, the second-stage piston 142 is not provided with a suction hole 12 communicating with the outside. The front end of the second-stage piston 142 divides the interior of the second-stage cylinder 141 into a second-stage suction chamber 140 and a second-stage compression chamber 143, and the front end of the second-stage piston 142 is provided with a through hole to communicate the second-stage suction chamber 140 and the second-stage compression chamber 143. The second-stage suction chamber 140 is further communicated with the first-stage exhaust chamber 138 through the second-stage suction passage 149 to inhale the gas after the first-stage compression. The second-stage suction valve 146 is located in the second-stage compression chamber 143 and can also be in the form of a suction valve plate. When the second-stage piston 142 moves to the left, the gas after the first-stage compression in the second-stage suction chamber 140 enters the second-stage compression chamber 143 through the through hole of the second-stage piston 142 and passes through the suction port of the suction valve plate; when the second-stage piston 142 moves to the right, the suction valve plate closely adheres to the front end wall surface of the second-stage piston 142, thereby blocking the through hole of the second-stage piston 142, and the gas in the second-stage compression chamber 143 is subjected to the second-stage compression; until the pressure in the second-stage compression chamber 143 exceeds the pre-tightening force of the second-stage pre-tightening spring 147, the second-stage exhaust valve 144 is pushed open, and the gas after two-stage compression enters the second-stage exhaust chamber 148 and is discharged from the compressor.

[0069] In this embodiment, a multi-stage compression mechanism is formed by sequentially connecting multiple cylinder piston assemblies, so that a single compressor can achieve multi-stage compression, which is beneficial to reducing the single-stage compression ratio and improving the compressor efficiency.

[0070] Furthermore, as Figures 4 to 6As shown, at least one of the multiple cylinder piston assemblies is a single-stage compression cylinder piston assembly. The single-stage compression cylinder piston assembly includes a single-stage piston and a single-stage cylinder. The single-stage piston is provided with an air intake hole 12, and the compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve 21, so that gas enters the compression chamber of the single-stage cylinder through the air intake hole 12, and is discharged from the single-stage cylinder through the single-stage exhaust valve 21 after being compressed. Specifically, as Figure 4 shown, in this embodiment, two single-stage compression cylinder piston assemblies are taken as an example for illustration. The principles and structures of the first single-stage compression cylinder piston assembly and the second single-stage compression cylinder piston assembly are substantially the same. The first single-stage compression cylinder piston assembly includes a first single-stage cylinder 16, a first single-stage piston 18, a single-stage intake valve 20, a single-stage exhaust valve 21, a single-stage pre-tightening spring 22, a single-stage exhaust chamber 23, and a single-stage cylinder head 24; the second single-stage compression cylinder piston assembly includes a second single-stage cylinder 17, a second single-stage piston 19, a single-stage intake valve 20, a single-stage exhaust valve 21, a single-stage pre-tightening spring 22, a single-stage exhaust chamber 23, and a single-stage cylinder head 24. The difference is that the first single-stage cylinder 16 is a cylinder with both ends open, while the second single-stage cylinder 17 is a cylinder with the left end closed and the right end open; correspondingly, the oil supply passage 15 of the first single-stage piston 18 is one section less than that of the second single-stage piston 19.

[0071] The working process of the first single-stage compression cylinder piston assembly is taken as an example for illustration below. When the first single-stage piston 18 moves to the left, gas enters the compression chamber of the single-stage cylinder through the air intake hole 12 and passes through the intake port of the single-stage intake valve 20; when the first single-stage piston 18 moves to the right, the single-stage intake valve 20 blocks the air intake hole 12, and the gas in the compression chamber of the single-stage cylinder is compressed until the pressure in the compression chamber of the single-stage cylinder exceeds the pre-tightening force of the single-stage pre-tightening spring 22, and the single-stage exhaust valve 21 is pushed open. The gas after single-stage compression enters the single-stage exhaust chamber 23 and is discharged outside the compressor. In this embodiment, multiple single-stage compression cylinder piston assemblies directly suck air from the compressor back pressure chamber at the same time to form a multi-cylinder compressor, which is beneficial to increasing the exhaust volume of the compressor.

[0072] Furthermore, as Figures 7 to 9As shown, at least one of the multiple cylinder piston assemblies is a gas spring cylinder piston assembly. The gas spring compression cylinder piston assembly includes a gas spring piston 26 and a gas spring cylinder 25. The gas spring piston 26 is provided with an air suction hole 12. The compression chamber of the gas spring cylinder 25 is a closed cavity, so that gas enters the compression chamber of the gas spring cylinder 25 through the air suction hole 12 and forms a gas spring after being compressed. Specifically, in this embodiment, a combination of a gas spring cylinder piston assembly and a single-stage compression cylinder piston assembly is taken as an example for illustration. The structure and principle of the single-stage compression cylinder piston assembly are as described in the above embodiment and will not be elaborated here. The gas spring compression cylinder piston assembly includes a gas spring cylinder 25 with an open left end and a closed right end, a columnar gas spring piston 26, and a gas spring suction valve 27. The gas spring suction valve 27 can adopt a suction valve plate. More specifically, the axial length of the gas spring piston 26 is shorter than the axial length of the single-stage piston. When the single-stage piston moves to the top dead center position, there is still a certain distance between the end of the gas spring piston 26 and the end of the gas spring cylinder 25. Therefore, a gas spring is formed to play a role in resonant support. Among them, the top dead center position refers to the farthest point that the single-stage piston can reach without hitting the exhaust valve.

[0073] In this embodiment, the compression space formed by the gas spring piston and the gas spring cylinder is used as a gas spring resonance element, which can reduce a set of exhaust devices and improve the stiffness of the compressor resonance spring at the same time.

[0074] On the basis of the above embodiment, as Figures 1 to 9 shown, the stator component includes two E-shaped intermediate magnetic conductor stators 2, two side magnetic conductor stators 3, and a coil winding 4. The openings of the two intermediate magnetic conductor stators 2 are arranged opposite to each other, and the coil winding 4 is sleeved in the openings of the two intermediate magnetic conductor stators 2. The two side magnetic conductor stators 3 are respectively arranged on both sides of the intermediate magnetic conductor stator 2 at intervals to form two sets of air gaps 5. The rotor component includes two sheet-shaped permanent magnets 6 respectively inserted into the air gaps 5. Among them, the intermediate magnetic conductor stator 2 and the side magnetic conductor stator 3 are magnetic conductor laminations. The intermediate magnetic conductor stator 2 and the side magnetic conductor stators 3 on both sides form a symmetric magnetic circuit. The coil winding 4 passes through alternating current to generate a magnetic field, and through the symmetric magnetic circuit, a magnetic field alternating in positive and negative directions is formed in the long strip-shaped air gap 5. Under the action of the magnetic field, the permanent magnet 6 generates an axial reciprocating electromagnetic driving force, which further pushes the piston in the cylinder to compress the gas.

[0075] Furthermore, the mover component further includes a mover bracket 7, and two sheet-shaped permanent magnets 6 are installed at both ends of one side of the mover bracket 7 in parallel. One side of the mover bracket 7 is connected to the stator component through a first resonance spring 8, and the other side of the mover bracket 7 is connected to the cylinder through a second resonance spring 9. The axes of the first resonance spring 8 and the second resonance spring 9 are parallel to each other and are both parallel to the reciprocating motion direction of the mover. Specifically, the mover bracket 7 can be made of shaped materials such as plastic, glass fiber, or carbon fiber. The axes of the first resonance spring 8 and the second resonance spring 9 can be conical springs, cylindrical springs, gas springs, or leaf springs.

[0076] Furthermore, a spring positioning flange for installing the first resonance spring 8 is provided on the outer edge of the mover bracket 7, and a spring positioning recess for installing the second resonance spring 9 is provided in the middle of the mover bracket 7. Both the spring positioning flange and the spring positioning recess are provided with metal or non-metal connectors for spring installation and positioning. This embodiment can achieve partial dimension overlapping installation of the resonance springs on both sides of the mover bracket 7, improving the stability of resonance.

[0077] Furthermore, an oil pump 10 is further included, and the oil pump 10 is used to pump lubricating oil to the moving interfaces of the cylinder and the piston. Oil supply channels 15 that communicate with each other are provided in the cylinder wall, inside the piston, and inside the piston pin 11.

[0078] As can be seen from the above embodiments, the square linear compressor provided by the present invention includes a machine base, a square linear oscillating motor, and multiple cylinder-piston assemblies. The mover component of the square linear oscillating motor is inserted into the air gap formed by the stator component, and the mover component is driven to reciprocate by electromagnetic force; the number of cylinder-piston assemblies is at least two, and each cylinder-piston assembly includes a piston and a cylinder. The end of the piston is flexibly connected to the mover component, and the front end of the piston is reciprocally movably installed in the cylinder to transmit the reciprocating motion of the mover component to the piston to generate compressed gas. At the same time, at least two pistons are flexibly connected to the mover component to achieve circumferential positioning of the square mover component. This square linear compressor realizes circumferential positioning of the square mover component by flexibly connecting multiple cylinder-piston assemblies to the mover component, which can prevent circumferential rotation of the mover component of the square linear motor, avoid causing the mover to get stuck, and improve the structural stability.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A square linear compressor, characterized in that, It includes a machine base, a square linear oscillating motor, and multiple cylinder-piston assemblies. The square linear oscillating motor includes a stator component and a rotor component, and the stator component is fixedly connected to the machine base; The cylinder-piston assembly includes a piston and a cylinder. The cylinder is fixedly connected to the machine base. The front end of the piston is reciprocally movably installed in the cylinder. The front end wall surface of the piston and the cylinder enclose a compression chamber. An intake valve is installed on the front end wall surface of the piston; at least one of the pistons is provided with an intake hole, and at least one of the compression chambers of the cylinders is provided with an exhaust valve, so that gas enters the compression chamber through the intake hole, and after being compressed, is discharged from the cylinder through the exhaust valve; The stator component and the multiple cylinder-piston assemblies are respectively arranged on both sides of the rotor component. One end of the rotor component is inserted into the air gap formed by the stator component. The ends of the pistons of the multiple cylinder-piston assemblies are flexibly connected to the other end of the rotor component, and the pistons of the multiple cylinder-piston assemblies are arranged at intervals; n cylinder-piston assemblies among the multiple cylinder-piston assemblies are sequentially connected to form an n-stage compression mechanism, where n is an integer greater than or equal to 2; The front end of the nth-stage piston of the nth-stage cylinder-piston assembly divides the interior of the nth-stage cylinder into an nth-stage intake chamber and an nth-stage compression chamber, and the front end of the nth-stage piston is provided with a through hole to communicate the nth-stage intake chamber and the nth-stage compression chamber; The compressed gas in the nth-stage compression chamber is discharged through the nth-stage exhaust valve; When n is greater than 2, the front end of the (n - 1)th-stage piston of the (n - 1)th-stage cylinder-piston assembly divides the interior of the (n - 1)th-stage cylinder into an (n - 1)th-stage intake chamber and an (n - 1)th-stage compression chamber, and the front end of the (n - 1)th-stage piston is provided with a through hole to communicate the (n - 1)th-stage intake chamber and the (n - 1)th-stage compression chamber; the (n - 1)th-stage compression chamber is communicated to a closed (n - 1)th-stage exhaust chamber through the (n - 1)th-stage exhaust valve; the (n - 1)th-stage exhaust chamber is communicated to the nth-stage intake chamber through the nth-stage intake passage; The front end wall surface of the first-stage piston and the first-stage cylinder of the first-stage cylinder-piston assembly enclose a first-stage compression chamber. The first-stage piston is provided with the intake hole, so that gas enters the first-stage compression chamber through the intake hole; the first-stage compression chamber is communicated to a closed first-stage exhaust chamber through the first-stage exhaust valve; the first-stage exhaust chamber is communicated to the second-stage intake chamber through the second-stage intake passage.

2. The square linear compressor according to claim 1, wherein, At least one of the multiple cylinder-piston assemblies is a single-stage compression cylinder-piston assembly. The single-stage compression cylinder-piston assembly includes a single-stage piston and a single-stage cylinder. The single-stage piston is provided with the intake hole, and the compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve, so that gas enters the compression chamber of the single-stage cylinder through the intake hole, and after being compressed, is discharged from the single-stage cylinder through the single-stage exhaust valve.

3. The square linear compressor according to claim 2, wherein, At least one of the multiple cylinder piston assemblies is a gas spring cylinder piston assembly, which includes a gas spring piston and a gas spring cylinder. The gas spring piston is provided with the suction hole, and the compression chamber of the gas spring cylinder is a closed cavity, so that gas enters the compression chamber of the gas spring cylinder through the suction hole and forms a gas spring after being compressed.

4. The square linear compressor according to claim 1, wherein The stator component includes two E-shaped intermediate magnetic conductor stators, two side magnetic conductor stators and a coil winding; the openings of the two intermediate magnetic conductor stators are arranged opposite to each other, and the coil winding is sleeved in the openings of the two intermediate magnetic conductor stators; the two side magnetic conductor stators are respectively arranged on both sides of the intermediate magnetic conductor stators at intervals to form two sets of air gaps. The rotor component includes two sheet-shaped permanent magnets respectively inserted into the air gaps.

5. The square linear compressor according to claim 4, wherein, The rotor component further includes a rotor bracket. The two sheet-shaped permanent magnets are installed at both ends of one side of the rotor bracket in parallel; one side of the rotor bracket is connected to the stator component through a first resonant spring, and the other side of the rotor bracket is connected to the cylinder through a second resonant spring. The axes of the first resonant spring and the second resonant spring are parallel to each other.

6. The square linear compressor according to claim 5, wherein, The outer edge of the rotor bracket is provided with a spring positioning flange for installing the first resonant spring, and the middle part of the rotor bracket is provided with a spring positioning recess for installing the second resonant spring.

7. The square linear compressor according to claim 1, wherein The suction valve is a suction valve sheet fixedly connected to the front end wall surface of the piston; one end of the exhaust valve abuts against the exhaust port of the compression chamber, and the other end of the exhaust valve is connected to the cylinder through a pre-tightening spring.

8. The square linear compressor according to claim 1, wherein It further includes an oil pump for pumping lubricating oil to the moving interfaces of the cylinder and the piston.

9. The square linear compressor according to any one of claims 1 to 8, characterized in that, The flexible connection mode between the piston and the rotor component includes piston pin connection, ball head connection or elastic threaded screw rod connection.

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