Linear compressor driven by electric spark expansion and control method thereof

Abstract

The invention discloses a linear compressor driven by electric spark expansion and a control method thereof.The compressor comprises a liquid containing cavity cylinder body, a middle baffle, an air cylinder and an exhaust cavity cylinder body which are sequentially connected, a piston shaft penetrates through a through hole of the middle baffle to be installed, and the two ends of the piston shaft are connected with a first piston and a second piston correspondingly; the first piston is arranged in the liquid containing cavity cylinder body, and the second piston is arranged in the air cylinder. A first spring is arranged between the first piston and the middle baffle, an air suction hole is formed in the second piston, and an air inlet hole is formed in the air cylinder. An exhaust valve is arranged between the exhaust cavity cylinder body and the air cylinder, a second spring is arranged between the exhaust valve and the inner wall of the exhaust cavity cylinder body, and an exhaust hole is formed in the exhaust cavity cylinder body; the liquid containing cavity cylinder body is filled with expansion liquid, and positive and negative electrodes are arranged on the liquid containing cavity cylinder body and connected with an electric spark discharge system. The reciprocating compressor has remarkable advantages in the aspects of energy efficiency, stability, reliability and the like, and the control cost of the reciprocating compressor is reduced.

Description

Technical Field

[0001] The invention belongs to the field of compressors, and in particular relates to a linear compressor driven by electric spark expansion and a control method thereof. Background Art

[0002] Traditional reciprocating compressors need to use a crank-connecting rod mechanism to convert the rotary motion of the motor into the reciprocating linear motion of the piston. The crank-connecting rod mechanism will cause the piston and cylinder of the reciprocating compressor to have unavoidable periodic forces and friction, which will deteriorate the energy efficiency, vibration and noise level of the reciprocating compressor. Due to the motion characteristics of the crank-connecting rod mechanism, when the piston reciprocates in the cylinder, it will be subject to the combined action of periodic gas pressure and mechanical friction. This not only increases energy consumption, but also may cause rapid wear of components, thereby affecting the reliability and life of the compressor. Friction consumes part of the input power and converts it into heat energy instead of useful compression work, thereby reducing the energy efficiency of the compressor. In addition, the periodically changing load may also cause the motor to operate at a non-optimal efficiency point, further reducing the overall energy efficiency. The unbalanced force and inertial force of the crank-connecting rod mechanism are one of the main sources of vibration and noise in the compressor. These vibrations not only affect the stable operation of the equipment, but may also be transmitted to the surrounding environment through the structure, causing noise pollution. In the past, by improving the geometry and material selection of the crank-connecting rod, friction and wear can be reduced and mechanical efficiency can be improved. The use of high-performance lubricants and advanced lubrication systems can effectively reduce the friction coefficient, energy loss and component wear. The use of wear-resistant and high-temperature resistant high-performance materials to manufacture pistons and cylinders can extend component life and improve compressor reliability. However, these approaches cannot fundamentally solve the problem.

[0003] Reciprocating compressors that use linear motor technology eliminate the crank-connecting rod mechanism, which can effectively reduce the contact between the piston and the cylinder and improve the integration performance of the compressor. However, since the electromagnetic force of the motor directly drives the piston, a high-frequency controller is required to achieve precise control of the piston position through precise electromagnetic control, which significantly increases the use cost of this type of compressor. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and to provide a linear compressor driven by spark expansion and a control method thereof, which can fundamentally solve the problem that the contact between the piston and the cylinder caused by the crank-connecting rod machine deteriorates the performance of the reciprocating compressor, and the problem that the high-frequency controller used in traditional linear motor drives has a high cost.

[0005] In order to achieve the above object, the present invention has the following technical solutions:

[0006] In a first aspect, a linear compressor driven by electric spark expansion is provided, comprising a liquid containing chamber cylinder body, an intermediate baffle, a cylinder and an exhaust chamber cylinder body connected in sequence, a through hole is provided at the center of the intermediate baffle, a piston shaft is installed through the through hole of the intermediate baffle, two ends of the piston shaft are respectively connected to a first piston and a second piston, the first piston is arranged inside the liquid containing chamber cylinder body, and the second piston is arranged inside the cylinder; a first spring is provided between the first piston and the intermediate baffle, an air suction hole is provided on the second piston, and an air inlet hole is provided on the cylinder, gas enters the internal cavity of the cylinder from the air inlet hole on the cylinder, and then enters the compression cavity through the air suction hole of the second piston; an exhaust valve is provided between the exhaust chamber cylinder body and the cylinder, a second spring is provided between the exhaust valve and the inner wall of the exhaust chamber cylinder body, an exhaust hole is provided on the exhaust chamber cylinder body, when the gas pressure inside the compression cavity is greater than the elastic force of the second spring, the exhaust valve opens to exhaust the gas; the liquid containing chamber cylinder body is filled with expansion liquid, positive and negative electrodes are provided on the liquid containing chamber cylinder body, and the positive and negative electrodes are connected to the electric spark discharge system.

[0007] As a preferred solution, the electric spark discharge system includes a power supply, which is connected to the low-voltage side of the step-up transformer through a diode, and the high-voltage side of the step-up transformer is connected to the high-voltage pulse capacitor through a resistor. The high-voltage pulse capacitor is connected to the positive and negative electrodes through a circuit with a diode to ignite the expanding liquid inside the liquid cavity cylinder.

[0008] As a preferred solution, a discharge control system is provided in the spark discharge system, and the discharge control system includes an electromagnetic relay and a Hall sensor. The Hall sensor is arranged at the starting position of the first piston inside the liquid cavity cylinder body, and the electromagnetic relay is connected to the high-voltage pulse capacitor and the Hall sensor. The electromagnetic relay controls the spark discharge of the high-voltage pulse capacitor on and off according to the detection signal of the Hall sensor.

[0009] As a preferred solution, an expansion liquid replenishing hole is provided on the liquid containing chamber cylinder body, and the expansion liquid consumed by combustion is replenished through the expansion liquid replenishing hole.

[0010] As a preferred solution, the intermediate baffle adopts a wheel-shaped structure, and a plurality of first springs are provided;

[0011] The intermediate baffle has a central ring and an outer ring, and a plurality of gear connecting plates connected between the central ring and the outer ring; the surface of the first piston and the surface of each gear connecting plate are provided with an annular protrusion for fixing and installing the first spring;

[0012] The second spring is a conical spring, the large end of the conical spring is fixed on the exhaust valve, and the small end of the conical spring is fixed on the inner wall of the exhaust chamber cylinder.

[0013] As a preferred solution, a linear bearing is installed on the through hole of the intermediate baffle, and the piston shaft is supported by the linear bearing.

[0014] As a preferred solution, the outer ring of the linear bearing is provided with a retaining groove, and a retaining ring is installed on the retaining groove to prevent the linear bearing from moving during operation.

[0015] As a preferred solution, two suction holes are symmetrically provided on the second piston, and suction valve plates are installed on the two suction holes through suction valve seats.

[0016] As a preferred solution, a first piston sealing ring is arranged between the outer periphery of the first piston and the inner wall of the liquid chamber cylinder body, and a second piston sealing ring is arranged between the outer periphery of the second piston and the inner wall of the cylinder; the first piston sealing ring is made of polytetrafluoroethylene material.

[0017] In a second aspect, a control method for a linear compressor driven by spark expansion is provided, comprising:

[0018] The electric spark discharge system loop is closed, and the positive and negative electrodes provided on the liquid chamber cylinder are discharged through the high-voltage pulse capacitor, so that an electric spark explosion is generated in the chamber of the liquid chamber cylinder. The force generated by the explosion pushes the liquid in the liquid chamber cylinder to expand outward, pushing the first piston to move; after the explosion is completed, the expansion force of the liquid in the chamber of the liquid chamber cylinder disappears, and the collapse force generated by the disappearance of the expansion force drives the first piston to reset;

[0019] The position of the first piston is detected by the Hall sensor. When the first piston is reset to the starting position, the moving contact and the static contact of the electromagnetic relay are connected. The electromagnetic relay controls the high-voltage pulse capacitor to discharge the positive and negative electrodes set on the liquid chamber cylinder again, thereby pushing the first piston to move again. This reciprocating process completes the control and drive of the linear compressor.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] Although the traditional reciprocating compressor using linear motor technology has eliminated the crank-connecting rod mechanism, the electromagnetic force of the motor directly drives the piston, and a high-frequency controller is required to achieve precise control of the piston position through precise electromagnetic control, which increases the cost of use. The present invention is different from the existing motor-driven reciprocating compressor. By filling the liquid cavity cylinder with expansion liquid, the liquid cavity cylinder is provided with positive and negative electrodes, and the positive and negative electrodes are connected to the electric spark discharge system. An electric spark explosion occurs inside the liquid cavity cylinder, and the liquid expansion drives the piston to move and compress the gas; when the explosion ends, the liquid expansion force in the liquid cavity disappears, and the collapse force generated by the disappearance of the expansion force drives the piston to reset, and the compressor operates alternately to achieve reciprocating linear motion of the piston. The present invention replaces the traditional use of linear motors to drive the piston, and has significant advantages in energy efficiency, stability, reliability, etc., reduces the control cost of reciprocating compressors, and provides a reliable and efficient solution for industrial production.

[0022] Furthermore, a discharge control system is provided in the electric spark discharge system of the present invention, and the discharge control system includes an electromagnetic relay and a Hall sensor. The Hall sensor is arranged at the starting position of the first piston inside the liquid cavity cylinder body, and the electromagnetic relay is connected to the high-voltage pulse capacitor and the Hall sensor. The electromagnetic relay controls the discharge of the high-voltage pulse capacitor according to the detection signal of the Hall sensor. The Hall sensor and the electromagnetic relay are combined to realize automatic detection of the reset status of the first piston, and automatically control the discharge of the high-voltage pulse capacitor according to the detection signal. The precise position of the piston can be precisely controlled through precise electromagnetic control without the need for a high-frequency controller. The use is convenient and the cost is reduced. An expansion liquid replenishing hole is opened on the liquid cavity cylinder body, and the expansion liquid consumed by combustion can be replenished through the expansion liquid replenishing hole, thereby simplifying the equipment structure and effectively ensuring the smooth operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the design principle of the electric spark discharge system and the discharge control system according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic cross-sectional structure diagram of a linear compressor driven by electric spark expansion according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the moving parts of a linear compressor driven by electric spark expansion according to an embodiment of the present invention;

[0027] Figure 4 This is a front structural schematic diagram of an intermediate baffle of a linear compressor driven by electric spark expansion according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the front structure of an air intake valve of a linear compressor driven by electric spark expansion according to an embodiment of the present invention;

[0029] In the attached drawings: 1-liquid chamber cylinder; 2-first piston sealing ring; 3-first spring; 4-middle baffle; 5-stop ring; 6-bolt; 7-cylinder; 8-O-ring; 9-exhaust chamber cylinder; 10-second spring; 11-exhaust valve; 12-intake valve plate; 13-intake valve seat; 14-second piston; 15-second piston sealing ring; 16-linear bearing; 17-first piston; 18-piston shaft;

[0030] 101-power supply; 102-diode; 103-step-up transformer; 104-resistance; 105-high-voltage pulse capacitor; 106-electromagnetic relay; 107-Hall sensor; 401-center ring; 402-outer ring; 403-gear tooth connecting plate; 404-annular protrusion. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] See also Figure 1 and Figure 2 The embodiment of the present invention proposes a linear compressor driven by electric spark expansion, which structurally includes a liquid chamber cylinder body 1, an intermediate baffle 4, a cylinder 7 and an exhaust chamber cylinder body 9 which are connected in sequence. The components are connected by bolts 6 to form a closed shell. A bracket for fixing the compressor body is designed below the liquid chamber cylinder body 1 and the cylinder 7.

[0033] A through hole is opened in the center of the middle baffle 4, and the piston shaft 18 is installed through the through hole of the middle baffle 4. The two ends of the piston shaft 18 are respectively connected to the first piston 17 and the second piston 14. The first piston 17 is arranged inside the liquid chamber cylinder body 1, and the second piston 14 is arranged inside the cylinder 7.

[0034] A first spring 3 is arranged between the first piston 17 and the middle baffle 4, an air suction hole is opened on the second piston 14, and an air inlet hole is opened on the cylinder 7. The gas enters the internal cavity of the cylinder 7 from the air inlet hole on the cylinder 7, and then enters the compression cavity through the air suction hole of the second piston 14; an exhaust valve 11 is arranged between the exhaust cavity cylinder body 9 and the cylinder 7, a second spring 10 is arranged between the exhaust valve 11 and the inner wall of the exhaust cavity cylinder body 9, and an exhaust hole is opened on the exhaust cavity cylinder body 9. When the gas pressure inside the compression cavity is greater than the elastic force of the second spring 10, the exhaust valve 11 opens to exhaust the gas.

[0035] The interior of the liquid containing chamber cylinder body 1 and the cylinder 7 is designed with limiting parts of the first piston 17 and the second piston 14.

[0036] The liquid containing cylinder 1 is filled with expansion liquid, and positive and negative electrodes are arranged on the liquid containing cylinder 1, and the positive and negative electrodes are connected to the electric spark discharge system. Figure 1 As shown, the spark discharge system includes a power supply 101, which is connected to the low-voltage side of a step-up transformer 103 through a diode 102, and the high-voltage side of the step-up transformer 103 is connected to a high-voltage pulse capacitor 105 through a resistor 104. The high-voltage pulse capacitor 105 is connected to positive and negative electrodes through a circuit with a diode to ignite the expanding liquid inside the liquid chamber cylinder 1. At the same time, a discharge control system is provided in the spark discharge system, and the discharge control system includes an electromagnetic relay 106 and a Hall sensor 107. The Hall sensor 107 is provided at the starting position of the first piston 17 inside the liquid chamber cylinder 1, and the electromagnetic relay 106 is connected to the high-voltage pulse capacitor 105 and the Hall sensor 107. The electromagnetic relay 106 controls the on and off of the spark discharge of the high-voltage pulse capacitor 105 according to the detection signal of the Hall sensor 107.

[0037] When the Hall sensor senses that the piston in the linear compressor is reset, the induction circuit where the electromagnetic relay 106 is located is connected, the moving and static contacts are in contact, and the discharge circuit is closed. After the electric spark discharge circuit is closed, the electricity stored in the high-voltage pulse capacitor 105 is discharged through the positive and negative electrodes, and an electric spark explosion occurs in the liquid chamber cylinder 1 of the linear compressor. The liquid expansion pushes the first piston 17 and the second piston 14 to move, compressing the gas; when the explosion is over, the liquid expansion force in the liquid chamber cylinder 1 disappears, and the collapse force generated by the disappearance of the liquid expansion force drives the first piston 17 and the second piston 14 to reset. When the piston is reset to the initial position, the electromagnetic relay 106 is activated, the induction circuit is connected, and the next operation process is carried out, and the compression process is completed in a cycle. An expansion liquid replenishing hole is opened on the liquid chamber cylinder 1, and the expansion liquid consumed by combustion is replenished through the expansion liquid replenishing hole.

[0038] See also Figure 3 and Figure 4In a possible implementation, the intermediate baffle 4 adopts a wheel-shaped structure, and a plurality of first springs 3 are provided; the intermediate baffle 4 has a center ring 401 and an outer ring 402, and a plurality of gear connecting plates 403 connected between the center ring 401 and the outer ring 402; the surface of the first piston 17 and the surface of each gear connecting plate 403 are provided with an annular protrusion 404 for fixing and installing the first spring 3; the second spring 10 adopts a conical spring, the large end of the conical spring is fixed on the exhaust valve 11, and the small end of the conical spring is fixed on the inner wall of the exhaust chamber cylinder body 9. The conical spring 10 of this embodiment can quickly respond to changes in external loads, thereby achieving rapid opening or closing.

[0039] like Figure 2 As shown, in a possible implementation, a linear bearing 16 is installed on the through hole of the intermediate baffle 4, and the piston shaft 18 is supported by the linear bearing 16. The outer ring of the linear bearing 16 is provided with a retaining groove, and a retaining ring 5 is installed on the retaining groove to prevent the linear bearing 16 from moving in the bearing seat during operation, thereby playing a fixing role.

[0040] See also Figure 3 and Figure 5 In a possible implementation manner, two suction holes are symmetrically opened on the second piston 14 , and suction valve plates 12 are installed on both suction holes through suction valve seats 13 .

[0041] See also Figure 2 In a possible implementation, a first piston sealing ring 2 is provided between the outer periphery of the first piston 17 and the inner wall of the liquid chamber cylinder body 1, a second piston sealing ring 15 is provided between the outer periphery of the second piston 14 and the inner wall of the cylinder 7, and an O-ring 8 is also installed at the interface between the cylinder 7 and the exhaust chamber cylinder body 9.

[0042] The first piston sealing ring 2 is made of polytetrafluoroethylene (PTFE) material. Polytetrafluoroethylene (PTFE) has excellent chemical stability, extremely low friction coefficient, good electrical insulation and a high operating temperature range. The first piston sealing ring 2 is used to prevent gas leakage during the compression process and has a lubricating effect.

[0043] Another embodiment of the present invention further provides a control method for a linear compressor driven by electric spark expansion, comprising:

[0044] The electric spark discharge system loop is closed, and the positive and negative electrodes provided on the liquid chamber cylinder body 1 are discharged through the high-voltage pulse capacitor 105, so that an electric spark explosion is generated in the chamber of the liquid chamber cylinder body 1. The force generated by the explosion pushes the liquid in the liquid chamber cylinder body 1 to expand outward, pushing the first piston 17 to move; after the explosion is completed, the expansion force of the liquid in the chamber of the liquid chamber cylinder body 1 disappears, and the collapse force generated by the disappearance of the expansion force drives the first piston 17 to reset;

[0045] The position of the first piston 17 is detected by the Hall sensor 107. When the first piston 17 is reset to the starting position, the armature of the electromagnetic relay 106 moves, the moving contact and the static contact are connected, and the electromagnetic relay 106 controls the high-voltage pulse capacitor 105 to discharge the positive and negative electrodes provided on the liquid chamber cylinder 1 again, thereby pushing the first piston 17 to move again;

[0046] This process is repeated repeatedly to complete the control and driving of the linear compressor.

[0047] The linear compressor driven by electric spark expansion in the present invention is different from the existing traditional motor compressor. It uses electric spark expansion to drive the piston movement instead of the traditional motor drive, which simplifies the operation of the equipment and reduces the energy loss caused by the crank-connecting rod mechanism used in the traditional compressor. The new control system can effectively ensure the smooth operation of the compressor.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the scope of protection involved.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A linear compressor driven by electric spark expansion, characterized in that: The invention comprises a liquid containing chamber cylinder body (1), an intermediate baffle (4), a cylinder (7) and an exhaust chamber cylinder body (9) which are connected in sequence. A through hole is provided at the center of the intermediate baffle (4). A piston shaft (18) is installed by passing through the through hole of the intermediate baffle (4). The two ends of the piston shaft (18) are respectively connected to a first piston (17) and a second piston (14). The first piston (17) is arranged inside the liquid containing chamber cylinder body (1), and the second piston (14) is arranged inside the cylinder (7). A first spring (3) is arranged between the first piston (17) and the intermediate baffle (4). An air suction hole is provided on the second piston (14), and an air inlet hole is provided on the cylinder (7). , gas enters the internal cavity of the cylinder (7) from the air inlet hole on the cylinder (7), and then enters the compression cavity through the air intake hole of the second piston (14); an exhaust valve (11) is arranged between the exhaust cavity cylinder body (9) and the cylinder (7), a second spring (10) is arranged between the exhaust valve (11) and the inner wall of the exhaust cavity cylinder body (9), and an exhaust hole is opened on the exhaust cavity cylinder body (9); when the gas pressure inside the compression cavity is greater than the elastic force of the second spring (10), the exhaust valve (11) opens to exhaust the gas; the liquid containing cavity cylinder body (1) is filled with expansion liquid, and positive and negative electrodes are arranged on the liquid containing cavity cylinder body (1), and the positive and negative electrodes are connected to the electric spark discharge system.

2. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: The electric spark discharge system comprises a power supply (101), the power supply (101) is connected to the low voltage side of a step-up transformer (103) via a diode (102), the high voltage side of the step-up transformer (103) is connected to a high voltage pulse capacitor (105) via a resistor (104), the high voltage pulse capacitor (105) is connected to positive and negative electrodes via a circuit with a diode, and ignites the expanding liquid inside the liquid chamber cylinder (1).

3. The linear compressor driven by electric spark expansion according to claim 2, characterized in that: The spark discharge system is provided with a discharge control system, which comprises an electromagnetic relay (106) and a Hall sensor (107). The Hall sensor (107) is provided at the starting position of the first piston (17) inside the liquid chamber cylinder (1). The electromagnetic relay (106) is connected to the high-voltage pulse capacitor (105) and the Hall sensor (107). The electromagnetic relay (106) controls the spark discharge of the high-voltage pulse capacitor (105) to be turned on and off according to the detection signal of the Hall sensor (107).

4. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: The liquid containing chamber cylinder (1) is provided with an expansion liquid replenishing hole, through which the expansion liquid consumed by combustion is replenished.

5. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: The intermediate baffle (4) adopts a wheel-shaped structure, and a plurality of the first springs (3) are provided; The intermediate baffle (4) comprises a central ring (401) and an outer ring (402), and a plurality of gear link plates (403) connected between the central ring (401) and the outer ring (402); an annular protrusion (404) for fixing and mounting the first spring (3) is provided on the surface of the first piston (17) and the surface of each gear link plate (403); The second spring (10) is a conical spring, the large end of the conical spring is fixed on the exhaust valve (11), and the small end of the conical spring is fixed on the inner wall of the exhaust chamber cylinder body (9).

6. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: A linear bearing (16) is installed on the through hole of the intermediate baffle (4), and the piston shaft (18) is supported by the linear bearing (16).

7. The linear compressor driven by electric spark expansion according to claim 6, characterized in that: The outer ring of the linear bearing (16) is provided with a retaining groove, and a retaining ring (5) is installed on the retaining groove to prevent the linear bearing (16) from moving during operation.

8. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: The second piston (14) is symmetrically provided with two air suction holes, and an air suction valve sheet (12) is installed on both air suction holes via an air suction valve seat (13).

9. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: A first piston sealing ring (2) is arranged between the outer periphery of the first piston (17) and the inner wall of the liquid containing chamber cylinder body (1), and a second piston sealing ring (15) is arranged between the outer periphery of the second piston (14) and the inner wall of the cylinder (7); the first piston sealing ring (2) is made of polytetrafluoroethylene material.

10. A control method for a linear compressor driven by electric spark expansion, characterized in that: include: The electric spark discharge system loop is closed, and the positive and negative electrodes provided on the liquid chamber cylinder (1) are discharged through the high-voltage pulse capacitor (105), so that an electric spark explosion is generated in the chamber of the liquid chamber cylinder (1), and the force generated by the explosion pushes the liquid in the liquid chamber cylinder (1) to expand outward, thereby pushing the first piston (17) to move; after the explosion is completed, the expansion force of the liquid in the chamber of the liquid chamber cylinder (1) disappears, and the collapse force generated by the disappearance of the expansion force drives the first piston (17) to reset; The position of the first piston (17) is detected by the Hall sensor (107). When the first piston (17) is reset to the starting position, the moving contact and the static contact of the electromagnetic relay (106) are connected, and the electromagnetic relay (106) controls the high-voltage pulse capacitor (105) to discharge the positive and negative electrodes provided on the liquid chamber cylinder (1) again, thereby pushing the first piston (17) to move again; this process is repeated to complete the control and driving of the linear compressor.

Images