A linear compressor driven by electric spark expansion and its control method

Abstract

A linear compressor driven by electric spark expansion and its control method are disclosed. The compressor comprises a liquid-containing cylinder body, an intermediate baffle, a cylinder, and an exhaust chamber cylinder body, which are connected in sequence. A piston shaft is installed through a through hole in the intermediate baffle. The ends of the piston shaft are connected to a first piston and a second piston, respectively. The first piston is disposed within the liquid-containing cylinder body, and the second piston is disposed within the cylinder. A first spring is disposed between the first piston and the intermediate baffle. The second piston has an air intake hole, and the cylinder has an air intake hole. An exhaust valve is disposed between the exhaust chamber cylinder body and the cylinder. A second spring is disposed between the exhaust valve and the inner wall of the exhaust chamber cylinder body. The exhaust chamber cylinder body has an exhaust hole. The liquid-containing cylinder body is filled with expansion liquid. Positive and negative electrodes are disposed on the liquid-containing cylinder body, and the positive and negative electrodes are connected to an electric spark discharge system. The present invention has significant advantages in terms of energy efficiency, stability, and reliability, reducing the control cost of a reciprocating compressor.

Description

Technical Field

[0001] The present 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 rely on a crank-connecting rod mechanism to convert the motor's rotary motion into reciprocating linear motion of the piston. This mechanism inevitably creates periodic forces and friction between the piston and cylinder, degrading the compressor's energy efficiency, vibration, and noise levels. Due to the kinematic characteristics of the crank-connecting rod mechanism, the piston is subject to periodic gas pressure and mechanical friction as it reciprocates within the cylinder. This not only increases energy consumption but can also lead to rapid component wear, compromising compressor reliability and lifespan. Friction dissipates some input power, converting it into heat rather than useful compression work, thereby reducing compressor energy efficiency. Furthermore, cyclically fluctuating loads can cause the motor to operate at suboptimal efficiency, further reducing overall energy efficiency. Unbalanced forces and inertia within the crank-connecting rod mechanism are a major source of compressor vibration and noise. These vibrations not only affect stable operation but can also be transmitted through the structure to the surrounding environment, causing noise pollution. Improvements to the crank-connecting rod geometry and material selection have been used to reduce friction and wear and improve mechanical efficiency. Using high-performance lubricants and advanced lubrication systems can effectively reduce friction, energy loss, and component wear. Using high-performance, wear-resistant, and high-temperature-resistant materials for pistons and cylinders can extend component life and improve compressor reliability. However, these approaches don't fundamentally solve the problem.

[0003] Reciprocating compressors using linear motor technology eliminate the crank-connecting rod mechanism, which can effectively reduce the contact between the piston and the cylinder and improve the integrated 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 operating 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 provide a linear compressor driven by electric 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 traditional linear motor drive uses a high-frequency controller with 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 accommodating chamber cylinder body, an intermediate baffle, a cylinder, and an exhaust chamber cylinder body connected in sequence, wherein 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, and both ends of the piston shaft are respectively connected to a first piston and a second piston, the first piston is arranged inside the liquid accommodating 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 intake 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 intake hole on the cylinder, and then enters the compression cavity through the air intake 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, and 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 discharge the gas; the liquid accommodating chamber cylinder body is filled with expansion liquid, and positive and negative electrodes are provided on the liquid accommodating 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, which 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. 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 opened on the liquid accommodating 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 comprises a central ring and an outer ring, and a plurality of gear link plates connected between the central ring and the outer ring; an annular protrusion for fixing and mounting the first spring is provided on the surface of the first piston and the surface of each gear link plate;

[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 both suction holes through suction valve seats.

[0016] As a preferred solution, a first piston sealing ring is provided between the outer periphery of the first piston and the inner wall of the liquid accommodating chamber cylinder, and a second piston sealing ring is provided 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 circuit is closed, and the positive and negative electrodes provided on the liquid chamber cylinder are discharged through the high-voltage pulse capacitor, causing an electric spark explosion in 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 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 returns 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 process is repeated to complete 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, requiring a high-frequency controller 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 chamber cylinder with expansion liquid, the liquid chamber 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 chamber cylinder, and the liquid expansion drives the piston to move, compressing the gas; when the explosion ends, the liquid expansion force in the liquid chamber disappears, and the collapse force generated by the disappearance of the expansion force drives the piston to reset, and the alternating operation is carried out to achieve reciprocating linear motion of the piston of the compressor. 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, the electric spark discharge system of the present invention is provided with a discharge control system, which 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. 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 combination of the Hall sensor and the electromagnetic relay can 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 electromagnetic control without the need for a high-frequency controller can realize precise control of the piston position, which is easy to use and reduces costs. 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, which simplifies the equipment structure and effectively ensures 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 following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

[0029] In the accompanying drawings: 1 - liquid chamber cylinder body; 2 - first piston sealing ring; 3 - first spring; 4 - intermediate baffle; 5 - retaining ring; 6 - bolt; 7 - cylinder; 8 - O-ring; 9 - exhaust chamber cylinder body; 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 - resistor; 105 - high-voltage pulse capacitor; 106 - electromagnetic relay; 107 - Hall sensor; 401 - center ring; 402 - outer ring; 403 - gear connecting plate; 404 - annular protrusion. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0032] See also Figure 1 and Figure 2 An 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 connected in sequence. The components are connected by bolts 6 to form a closed shell. A bracket for fixing the compressor body is designed under 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 provided between the first piston 17 and the intermediate baffle 4, an intake hole is provided on the second piston 14, and an intake hole is provided on the cylinder 7. The gas enters the internal cavity of the cylinder 7 from the intake hole on the cylinder 7, and then enters the compression cavity through the intake hole of the second piston 14; an exhaust valve 11 is provided between the exhaust cavity cylinder body 9 and the cylinder 7, a second spring 10 is provided between the exhaust valve 11 and the inner wall of the exhaust cavity cylinder body 9, and an exhaust hole is provided 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 discharge the gas.

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

[0036] The liquid chamber cylinder 1 is filled with expansion liquid, and positive and negative electrodes are provided on the liquid chamber cylinder 1, which 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 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 the positive and negative electrodes via a circuit with a diode, igniting the expanding liquid inside the liquid-containing cylinder 1. Furthermore, the spark discharge system is provided with a discharge control system, which includes an electromagnetic relay 106 and a Hall sensor 107. The Hall sensor 107 is positioned at the starting position of the first piston 17 inside the liquid-containing 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 based on the detection signal of the Hall sensor 107.

[0037] When the Hall sensor senses the piston reset in the linear compressor, the induction circuit containing electromagnetic relay 106 is connected, the moving and static contacts touch, and the discharge circuit closes. After the spark discharge circuit closes, the electricity stored in high-voltage pulse capacitor 105 is discharged through the positive and negative electrodes, causing a spark explosion in the liquid chamber cylinder 1 of the linear compressor. The liquid expands, pushing the first piston 17 and the second piston 14 to move, compressing the gas. When the explosion ends, 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 returns to its initial position, electromagnetic relay 106 is activated, the induction circuit is connected, and the next operation process begins, completing the compression process in a repetitive cycle. The liquid chamber cylinder 1 is provided with an expansion liquid replenishment hole, through which the expansion liquid consumed by combustion is replenished.

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

[0039] like Figure 2 As shown, in one possible embodiment, a linear bearing 16 is mounted in the through-hole of the intermediate baffle 4, supporting the piston shaft 18. The outer ring of the linear bearing 16 has a retaining groove, and a retaining ring 5 is mounted in the retaining groove to prevent the linear bearing 16 from moving within the bearing seat during operation, thereby securing the linear bearing 16.

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

[0041] See also Figure 2 In one possible embodiment, 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). PTFE has excellent chemical stability, a very low coefficient of friction, good electrical insulation, and a high operating temperature range. It prevents gas leakage during compression and also provides lubrication.

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

[0044] The electric spark discharge system loop is closed, and the positive and negative electrodes provided on the liquid storage chamber cylinder body 1 are discharged through the high-voltage pulse capacitor 105, causing an electric spark explosion in the liquid storage chamber cylinder body 1. The force generated by the explosion pushes the liquid in the liquid storage 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 liquid storage 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 returns to its 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 piston movement, replacing 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 traditional compressors. The use of a new control system can effectively ensure the smooth operation of the compressor.

[0048] It will be apparent 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 invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations that come within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the scope of protection.

[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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various 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) connected in sequence, wherein a through hole is provided at the center of the intermediate baffle (4), a piston shaft (18) is installed through the through hole of the intermediate baffle (4), and 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 provided 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) , 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 intake hole of the second piston (14); an exhaust valve (11) is provided between the exhaust cavity cylinder body (9) and the cylinder (7), a second spring (10) is provided between the exhaust valve (11) and the inner wall of the exhaust cavity cylinder body (9), and an exhaust hole is provided 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 discharge the gas; the liquid holding cavity cylinder body (1) is filled with expansion liquid, and positive and negative electrodes are provided on the liquid holding cavity cylinder body (1), and the positive and negative electrodes are connected to the electric spark discharge system; The electric spark discharge system includes a power supply (101), the power supply (101) is connected to the low-voltage side of a step-up transformer (103) through a diode (102), the high-voltage side of the step-up transformer (103) is connected to a high-voltage pulse capacitor (105) through a resistor (104), and 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); The spark discharge system is provided with a discharge control system, which 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). 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).

2. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: An expansion liquid replenishing hole is provided on the liquid accommodating cavity cylinder (1), and the expansion liquid consumed by combustion is replenished through the expansion liquid replenishing hole.

3. 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 to the exhaust valve (11), and the small end of the conical spring is fixed to the inner wall of the exhaust chamber cylinder (9).

4. 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).

5. The linear compressor driven by electric spark expansion according to claim 4, 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.

6. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: Two suction holes are symmetrically formed on the second piston (14), and suction valve plates (12) are installed on both suction holes through suction valve seats (13).

7. The linear compressor driven by electric spark expansion according to claim 1, characterized in that: 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 (1), and 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); the first piston sealing ring (2) is made of polytetrafluoroethylene material.

8. A method for controlling a linear compressor driven by 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). The force generated by the explosion pushes the liquid in the liquid chamber cylinder (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 (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 reciprocating process completes the control and driving of the linear compressor.

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