CN108757382A - It is a kind of to dynamic formula linear compressor - Google Patents

Abstract

The invention belongs to the field of compressors, and specifically discloses a counter-moving linear compressor, which includes a casing, a linear motor and two cylinders. End covers are arranged at both ends of the casing, and an organic casing air intake is provided on the casing. hole and casing exhaust hole; the linear motor is arranged in the casing, which includes a piston, a permanent magnet, a coil and a yoke, and the permanent magnet is embedded outside the piston and wrapped in the casing; One end of the cylinder is inserted between the piston and the housing as a gas bearing, the other end is connected to the end cover, and an exhaust valve plate is arranged inside, and an exhaust valve is arranged on the exhaust valve plate, which is connected to the end cover. There are preloaded springs in between. The invention can increase the refrigeration capacity of the compressor, so that it can meet the air-conditioning requirements of large spaces such as automobiles, and has the characteristics of high compression efficiency, low vibration and noise, and no oil lubrication.

Description

A counter-moving linear compressor

technical field

The invention belongs to the field of compressors, and more specifically relates to a counter-moving linear compressor.

Background technique

Electric vehicles are widely used due to their non-pollution, low noise, and diversification. Automobile air conditioners are one of the essential components of automobiles. Since electric vehicles cannot use traditional fuel-driven air-conditioning compressors to operate, battery-driven air-conditioning systems are generally used. However, due to the limited battery capacity, the energy consumption of the air conditioner has a great impact on the journey of the electric vehicle after one charge. Due to the operation of the air conditioning system, the cruising range of the electric vehicle is reduced by about 20-30%. Therefore, being able to design a high-efficiency and energy-saving electric air-conditioning system will play a strong role in promoting the development of the electric vehicle market.

The compressor is the main energy-consuming component in the air-conditioning system, and its energy consumption accounts for about 80% of the total energy consumption of the air-conditioning system. Therefore, it is very important to improve the efficiency of the compressor and reduce its energy consumption for electric vehicles. Electric car air-conditioning compressor generally adopts electric frequency conversion scroll compressor at present, for example a kind of scroll electric car air-conditioning compressor disclosed by CN207048984U, a kind of car air-conditioning rotary vane electric compressor disclosed by CN107091231B, although the above-mentioned compressor efficiency Compared with the crank-connecting rod compressor, it is much higher, but the price is high, and the scroll compressor needs lubricating oil to lubricate, which has a higher requirement for the oil content of the high-pressure gas discharged from the compressor, and the discharged gas takes away too much oil , will affect the refrigeration efficiency, and even cause compressor burnout accidents caused by insufficient oil in the compressor circulating oil circuit.

Contents of the invention

Aiming at the problems of high price and insufficient efficiency of scroll compressors for air conditioners of electric vehicles, efficiency reduction and compressor burnout caused by oil lubrication, the present invention proposes a counter-moving linear compressor, which uses the linear motor as a key component The research and design of the structure and the specific arrangement of other components can increase the cooling capacity of the linear compressor to meet the needs of air conditioning in large spaces such as automobiles. It has the characteristics of high compression efficiency, low vibration and noise, and no oil lubrication.

In order to achieve the above object, the present invention proposes a counter-moving linear compressor, which includes a casing, a linear motor and two cylinders, wherein:

The two ends of the casing are provided with end covers, and the casing is provided with an organic casing air intake hole and a casing exhaust hole;

The linear motor is arranged in the casing, which includes a piston, a permanent magnet, a coil and a yoke. The piston is a symmetrical structure, and a piston air inlet is opened on it, and an air suction valve is arranged at both ends of the piston. It is hollow, and the outer middle part is provided with a groove for embedding the permanent magnet, and the outer part of the piston is also covered with a casing that wraps the permanent magnet inside, and a casing is opened on the casing corresponding to the piston inlet hole. a body air intake hole, the coil is wound outside the casing, and is opposite to the permanent magnet inside the casing, and the yoke is arranged between the casing and the casing for wrapping the coil;

The two cylinders are located at both ends of the piston, one end of each cylinder is inserted into the gap between the piston and the housing, and the other end is connected to the end cover, wherein the cylinder is inserted between the piston and the housing One end of the gap between them is used as a gas bearing, on which holes are evenly distributed along the circumference of the cylinder, and an exhaust valve plate is arranged inside the end connected to the end cover of the cylinder, the distance between the exhaust valve plate and the end cover There is a pre-tightening spring between them, and the exhaust valve plate is also equipped with an exhaust valve. In addition, an air guide hole connected to the hole opened on the gas bearing is opened on the shell, and a cylinder exhaust hole is also opened on the cylinder. .

As a further preference, the air intake hole of the casing communicates with the air intake hole of the casing through an air intake pipe.

As a further preference, a resonant spring is arranged between the gas bearing and the side wall of the groove of the piston, and the resonant spring is sleeved on the piston.

As a further preference, the pre-tension spring is installed on the end cover, and the exhaust valve plate is pressed against the stepped surface inside the cylinder by means of the pre-tension spring, and the pre-tension force of the pre-tension spring is greater than that of the compressor when the compressor is in normal operation. Cylinder exhaust pressure.

As a further preference, a groove structure is provided on the side of the exhaust valve plate facing the suction valve, the groove structure is opposite to the suction valve, and its depth is greater than the thickness of the suction valve; A groove structure is also provided on the side of the valve plate facing away from the suction valve.

As a further preference, the inner surface of the cylinder is coated with a fluorocarbon nanocoating; the contact surface between the piston and the cylinder is coated with a fluorocarbon nanocoating.

As a further preference, a high temperature resistant anti-collision gasket is arranged in the groove structure on the side of the exhaust valve plate facing the intake valve.

Generally speaking, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:

1. The present invention adopts a dual-cylinder arrangement, which improves the cooling capacity of a single linear compressor, reduces vibration and noise, and improves efficiency. Traditional single-cylinder linear compressors can only complete compression, exhaust, and expansion in sequence The two cylinders share one piston, so the opposite process can be completed in the two cylinders at the same time, so the suction, exhaust, and cooling capacity are twice that of the single cylinder. , to meet the demand for higher cooling capacity; the gas force of the double-cylinder counter-moving linear compressor is symmetrically distributed, there is no movement midpoint offset, and the displacement does not change under variable working conditions, eliminating the need for offset detection and adjustment , It is easier to achieve precise clearance control, and the vibration is smaller, the stability is better, and the noise is smaller when the double-cylinder counter-moving type works.

2. The invention can recover the clearance volume high-pressure gas expansion work. The two cylinder working chambers of the double-cylinder counter-moving structure are in the opposite working process. When one cylinder working chamber is in the compression process, the other working chamber is just in the expansion process. , the high-pressure gas in the clearance volume pushes the piston to expand to do work, that is, the expansion work in the expansion process can be used to do the compression work in the compression process, so almost all of the clearance volume high-pressure gas expansion work can be recovered to improve the efficiency of the compressor.

3. The present invention adopts the gas bearing to realize oil-free lubrication. The present invention integrates the design of the gas bearing and the cylinder, and uses the cylinder exhaust gas to separate the piston from the cylinder. The inner wall surface of the bearing is coated with fluorocarbon nanomaterials to improve the wall surface characteristics, thus realizing oil-free lubrication.

4. The present invention embeds the permanent magnet into the groove in the middle position outside the piston, so that the piston can be used as the mover of the linear motor at the same time, and the permanent magnet and the piston reciprocate together under the action of the alternating magnetic field, so the piston of the present invention As the piston of the cylinder and as a part of the motor mover (it can be called the mover piston), the integrated design of the piston and the motor mover simplifies the structure of the linear motor, and adopts an embedded structure to embed the permanent magnet into the piston In the groove, the radial size of the motor is effectively reduced, thereby reducing the radial size of the entire motor.

Description of drawings

Fig. 1 is a structural schematic diagram of a counter-moving linear compressor provided by an embodiment of the present invention;

Fig. 2 is a sectional view of the compressor casing;

Fig. 3 is a sectional view of the piston;

Fig. 4 is a sectional view of the cylinder;

Fig. 5 is a sectional view of the housing;

Fig. 6 is a sectional view of the exhaust valve plate;

Fig. 7 is a schematic diagram of the working principle of the gas bearing.

In all the drawings, the same reference numerals are used to denote the same elements or structures, among them: 1-piston, 2-permanent magnet, 3-resonant spring, 4-housing, 5-cylinder, 6-end cover, 7-exhaust valve plate, 8-preload spring, 9-exhaust valve, 10-suction valve, 11-coil, 12-yoke, 13-casing, 14-intake pipe, 15-base, 16 -exhaust pipe, 17-gas bearing, 18-casing air intake, 19-casing exhaust, 20-piston air intake, 21-cylinder exhaust, 22-casing air intake, 23- Piston suction hole, 24-exhaust valve exhaust hole.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

At present, some linear compressors still use lubricating oil to lubricate moving parts. Using lubricating oil to lubricate moving parts requires installing a lubricating oil pump and setting up an oil circuit, which makes the structure of the compressor complex, and the lubricating oil entering the refrigeration system will also affect the replacement. The heat exchange of the heater reduces the efficiency of the air conditioning system. Moreover, due to the small cooling capacity, the general linear compressor is mostly used in small-capacity occasions such as refrigerators and Stirling refrigerators, and almost no one applies it to electric vehicles. Aiming at the above-mentioned present situation, the present invention proposes a counter-moving linear compressor. The compressor adopts a double-cylinder counter-moving arrangement, is driven by the principle of electromagnetic and mechanical resonance, and can be lubricated without oil by using a gas bearing. The present invention adopts a double-cylinder The counter-moving structure is equivalent to combining two linear compressors into one, increasing the cooling capacity twice that of ordinary linear compressors, so it can be applied to automotive air conditioners, and the two cylinders of the double-cylinder counter-moving structure The working chamber is in the opposite working process. When one cylinder working chamber is in the compression process, the other working chamber is just in the expansion process. The expansion work in the expansion process can be used to do the compression work in the compression process, so almost all the clearance volume can be recovered. High pressure The gas expansion work increases the efficiency of the compressor. In the present invention, the gas bearing is cleverly used on the linear compressor, and a layer of gas film can be formed between the piston and the cylinder, so as to realize oil-free lubrication. The linear compressor of the present invention has a large refrigerating capacity, which can meet the needs of automobiles. The movement of the double cylinders can recover all the expansion work of the high-pressure gas in the clearance volume of the compression chamber, and improve efficiency. The structure is simple, and the vibration and noise are very small. The radial force is small and there is almost no friction loss. The cooling capacity can be adjusted conveniently by adjusting the voltage to the coil. It is simpler and more reliable than frequency conversion adjustment. It has the advantages of low cost, higher efficiency, less power consumption, and no oil lubrication.

The counter-moving linear compressor of the present invention has a symmetrical structure as a whole. As shown in FIG. 1 , it is left-right symmetrical. The supporting part is used to install the linear motor and two cylinders, and the linear motor is used to drive the piston to reciprocate to do work on the cylinders at both ends of the piston. Gap volume high-pressure gas expansion work, improve compressor efficiency.

As shown in Figures 1 and 2, the casing 13 is a hollow cylinder, and the two ends of the casing 13 are provided with end caps 6, which seal the casing, and the casing 13 is provided with an organic casing air inlet 18 and Casing exhaust hole 19. Specifically, there are two casing air inlets 18 and two casing air outlets 19, and the two casing air inlets 18 are symmetrically arranged, and the two casing air outlets 19 are also symmetrically arranged, that is, the casing 13 Left and right symmetrical along the radial center line, there is an air intake hole of the same size at the same position on the left and right ends of the center line, which is used to connect the intake pipe, and an exhaust port of the same size is opened at the same position on the left and right ends of the center line Holes for connecting exhaust pipes. In order to facilitate the placement and support of the counter-moving linear compressor, four bases 15 are provided at the bottom of the casing 13 .

As shown in Figure 1 and Figures 3-5, the linear motor is arranged in the casing 13, which includes a piston 1, a permanent magnet 2, a coil 11 and a yoke 12, wherein the permanent magnet 2, the coil 11 and the yoke 12 constitute a The moving magnet type oscillating motor of the present invention. As shown in Figure 3, the piston 1 is a symmetrical structure (left and right, up and down are symmetrical), on which a piston air inlet 20 is provided, and an air intake valve 10 is arranged at both ends thereof, the piston 1 is an internal hollow structure, and the external The middle part is provided with a groove for inlaying and installing the permanent magnet 2, and the casing 4 wrapping the permanent magnet 2 is also set on the outside of the piston 1. The casing 4 can be, for example, an aluminum shell, which corresponds to the air inlet of the piston. The air inlet hole of the shell is opened at the position, the coil 11 is wound outside the shell 4, and is opposite to the permanent magnet 2 inside the shell 4, the yoke 12 is arranged between the shell 4 and the casing 13, and is used for coiling 11 packages included. Specifically, the two ends of the piston 1 are provided with a piston suction hole 23 , and through the opening and closing of the suction valve 10 , the connection and closure between the piston suction hole 23 and the outside world are realized.

Concretely, as shown in Fig. 3, several piston inlet holes 20 are evenly opened symmetrically on both sides of the middle part of the piston. On the right side, there are 6 piston air intake holes uniformly opened along the circumference of the piston, and the piston air intake holes on both sides are left and right symmetrical; the permanent magnet 2 is embedded in the groove in the middle of the piston 1, and is evenly distributed in a ring shape along the circumference; the yoke The iron 12 is stacked by silicon steel sheets into an arc shape, and is installed and fixed in the middle of the compressor casing 13 by the tube expansion method; the outer surface of the piston is also coated with a fluorocarbon nano-coating to improve its surface characteristics.

As shown in Figures 1 and 4, two cylinders 5 are located at both ends of the piston 1, and the two cylinders are symmetrically distributed at 180°, share one piston, and the two cylinders are installed in the same installation manner. Next, take the cylinder on the right side in Figure 1 as an example to illustrate the assembly relationship between the cylinder and other components. One end of the cylinder 5 is inserted into the gap formed between the right end of the piston 1 and the right end of the housing 4, and the other end is connected to the right end of the casing. The end cover 6 is connected, and one end of the cylinder 5 inserted in the gap between the piston 1 and the housing 4 (that is, the left end of the cylinder on the right side in Fig. 1) is used as a gas bearing 17, and there are holes evenly distributed along the circumference of the cylinder on it. hole, and the end of the cylinder 5 connected to the right end cover of the casing (that is, the right end of the right cylinder in Figure 1) is provided with an exhaust valve plate 7, between the exhaust valve plate 7 and the right end cover of the casing A pre-tension spring 8 is provided, an exhaust valve 9 is also arranged on the exhaust valve plate 7, and a cylinder exhaust hole 21 is also provided on the end of the right cylinder near the right end cover. Specifically, the exhaust valve plate 7 is provided with an exhaust valve exhaust hole 24, and through the opening and closing of the exhaust valve 9, the conduction between the exhaust valve exhaust hole 24 and the exhaust cavity on the outer surface of the exhaust valve plate is realized. Pass and close. The cylinder on the left side is arranged symmetrically with the cylinder on the right side, and its assembly method is completely consistent with that on the right side, so details will not be repeated here.

Specifically, the inner surface of the cylinder 5 is coated with a fluorocarbon nano-coating to improve the surface properties. As shown in Figures 4 and 5, the holes on the gas bearing are evenly arranged along the circumference, and there are several rows in a circular array, which are used for the exhaust gas of the compressor to enter the inner wall from the outer wall surface, and on the housing 4 and the cylinder 5 In the matching place, a hole with the same position as that on the gas bearing is made so that it is completely concentric and has the same diameter. In the present invention, one end of the cylinder is directly used as a gas bearing by opening holes uniformly distributed along the circumference, so that the gas bearing and the cylinder are processed in an integrated manner. , that is, the gas bearing is a part of the cylinder 5, eliminating the installation and fixing of the gas bearing, and the gas bearing must be coaxial with the cylinder. Further, a resonant spring 3 is arranged between the gas bearing and the side wall of the groove of the piston 1, and the resonant spring 3 is set on the piston 1. Since the two ends of the piston are symmetrically arranged with a cylinder, the resonant spring 3 is symmetrically set on it, Symmetrically arranged resonant springs are set in compression with equal preload. In addition, the air inlet of the casing is connected with the air inlet of the casing through an air inlet pipe 14 , and an exhaust pipe 16 is connected to the air outlet of the casing. The part where the piston 1 cooperates with the gas bearing and the inner wall of the cylinder 5 are coated with fluorocarbon nano-coating, which improves the wall surface characteristics and reduces the friction coefficient. The fluorocarbon nano-coating increases the thickness to nanometer level, which can effectively improve the roughness of the solid wall surface , Reduce the surface friction coefficient. After adding nano-fluorocarbon coating, the friction coefficient between walls is lower than that of lubricating oil, so that the compressor can achieve higher efficiency.

The above-mentioned intake pipe 14, piston air intake hole 20, suction valve 10, exhaust valve 9, exhaust valve plate 7, cylinder exhaust hole 21 and exhaust pipe constitute the suction and discharge structure of the linear compressor of the present invention , the air inlet pipe 14 is welded with the air inlet hole 18 of the casing and inserted into the air inlet interface of the casing 4, and sealedly connected with it, and the exhaust pipe 16 is inserted into the air outlet hole 19 of the casing and welded. As shown in FIG. 5 , the casing 4 is left-right symmetrical along the radial centerline, and a casing air inlet 22 of the same size is opened at the same position at the left and right ends of the centerline for connecting the air intake pipe. The left and right sides of the symmetry axis of the housing 4 are evenly arranged with gas bearing air intake holes along the circumference, and the two air intake pipes connecting the two housing air intake holes 22 will be connected outside the compressor casing through a larger air intake pipe. Together, the two exhaust pipes are also connected together by a larger diameter exhaust pipe.

Furthermore, the pre-tension spring 8 is installed on the end cover 6, and the exhaust valve plate 7 is pressed against the step surface inside the cylinder by means of the pre-tension spring 8. Pressure, the specific pretightening force can be designed according to actual needs, as long as it is ensured that when the compressor is working normally, the pretightening force pushes the exhaust valve plate against the end of the cylinder, and when the compressor is not working normally (the piston is about to hit the cylinder), the cylinder will The internal pressure will be greater than the normal exhaust pressure. Before the piston hits the cylinder, the pressure in the cylinder is greater than the pre-tightening force to push the exhaust valve plate open to prevent the cylinder from hitting. Therefore, when the compressor is working normally, the cylinder wall, the piston and the side of the exhaust valve plate facing the suction valve 10 together form a sealed cylinder compression chamber. When the piston stroke is too large, the end of the piston will hit the exhaust valve plate , the gas pressure in the compression chamber of the cylinder will be greater than the pre-tightening force of the pre-tightening spring 8. At this time, the exhaust valve plate will automatically spring open, avoiding the problem of the compressor hitting the cylinder, and improving the operating stability and life of the compressor. The cylinder wall, the end cover and the side of the exhaust valve plate facing the end cover together form an exhaust cavity, and the cylinder exhaust hole is connected to the exhaust cavity. Since the preload spring 8 is added in the exhaust cavity, the structural size becomes larger. , can effectively reduce noise, so the compressor of the present invention can no longer be provided with a muffler.

As shown in Figure 6, the inner plane of the exhaust valve plate 7 (closer to the side plane of the suction valve 10) is set in a groove structure, the depth of which is slightly greater than the thickness of the suction valve 10, so that the left and right dead points of the piston can reach the exhaust valve inside of the board. Because the valve plate has to withstand higher exhaust pressure and pre-tightening force of the pre-tightening spring, the valve plate is thicker, so the outer surface of the exhaust valve plate is also provided with the same groove as the inner surface, which can further reduce the residual pressure. Clearance volume, when the piston stroke is the largest, the clearance volume is only a small cylindrical volume in the middle of the valve plate, and the grooves on the inner and outer sides have the same structure, the same depth, and the same size, which is convenient for the processing of the valve plate. The groove structure is in communication with the vent hole 24 of the exhaust valve. In addition, a circle of high-temperature resistant anti-collision gaskets can be set on the inner plane of the exhaust valve plate to further protect the suction valve.

As shown in Figure 7, the principle of the gas bearing is as follows: refrigerant vapor or other gases enter the inner cavity of the piston through the intake pipe 14 and the piston intake hole 20 in sequence, and then enter the compression chamber of the cylinder through the piston suction hole 23 and the suction valve 10 to carry out During the compression process, the compressed high-pressure gas is discharged to the outside of the exhaust valve plate through the exhaust valve exhaust hole 24 and the exhaust valve 9, and is discharged to the outer cavity through the cylinder exhaust hole 21. Most of the high-pressure exhaust in the outer cavity passes through The exhaust pipe 16 is discharged from the compressor. Since the gas pressure in the outer chamber is greater than the gas pressure on the contact surface between the gas bearing and the piston, a small part of the high-pressure exhaust gas will enter into the housing and the hole of the gas bearing 17 due to the pressure difference. The contact surface of the piston and the cylinder enters the working chamber of the compressor, so a layer of gas film is formed on the contact surface of the piston, cylinder and gas bearing to avoid direct contact between the piston and the cylinder and gas bearing. In addition, by designing the distance between the holes on the gas bearing and the intake pipe, as well as the number and diameter of the holes, the high-pressure exhaust gas in the gas bearing will not mix with the intake air at the outlet of the intake pipe. The actual needs are comprehensively determined based on the dimensions of the various components of the compressor, as long as the high-pressure exhaust in the gas bearing does not mix with the intake air at the outlet of the intake pipe. The gas bearing can realize oil-free lubrication, has a simple structure and is convenient to process, and avoids the problem of efficiency reduction caused by an oil circuit system and lubricating oil.

The working principle of the counter-moving linear compressor of the present invention will be described below.

The coil 11 is fed with an alternating current to generate an alternating magnetic field, and the permanent magnet 2 is forced to reciprocate in the alternating magnetic field, driving the piston 1 to reciprocate in the left and right cylinders 5, compressing the gas to do work, and the resonant spring 3 moves with the piston 1 For motion, the resonant spring and the moving parts resonate at the design frequency to achieve the design effect, and the specific frequency can be designed according to the needs. Because the linear compressor of the present invention is left-right symmetrical (as shown in Figure 1), the working processes in the left and right cylinders are opposite, so it is assumed that the piston first moves to the left, and the principle is explained with the right cylinder as an example. When the piston 1 moves from right to left, gas such as refrigerant vapor enters the casing 4 from the intake pipe 14, and enters the inner cavity of the piston 1 through the piston air intake hole 20. When the gas pressure difference can open the suction valve 10, the gas in the piston 1 enters the cylinder 5 to start the suction process until the piston 1 reaches the left dead center position under the action of the resonant spring 3 and the moving magnet oscillating motor. At the end of the suction process, the suction valve 10 closes the suction hole under the action of its own spring force, and the piston 1 starts to move to the right under the action of the resonant spring 3 and the moving magnet oscillating motor, so that the volume of the cylinder 5 is reduced, and the cylinder 5 The gas such as refrigerant vapor in the cylinder is compressed, and when the gas pressure difference between the gas pressure in the cylinder 5 and the gas pressure on the outer surface of the exhaust valve plate 7 can open the exhaust valve 9, the exhaust valve 9 opens, and the gas in the cylinder is discharged into the The outer surface of the exhaust valve plate 7 is discharged into the cavity formed by the cylinder, the outer wall surface of the casing and the inner wall surface of the compressor casing through the cylinder exhaust hole 21 (referred to as the outer cavity), and most of the gas in the outer cavity passes through The exhaust pipe 16 is discharged from the compressor, and a small part enters the contact surface of the piston, the gas bearing and the cylinder through the gas bearing, and forms a circle of gas film along the cylindrical surface to avoid direct contact between the piston, the gas bearing and the cylinder; when the piston 1 reaches the right At the dead point, the exhaust process ends, the exhaust valve closes the exhaust hole under the action of its own elastic force, and the piston 1 starts to move to the left under the action of the resonant spring 3 and the moving magnet oscillating motor, and the expansion process begins. When the gas pressure in the piston 1 and the gas pressure difference in the cylinder 5 can open the suction valve 10, the gas in the piston 1 enters the cylinder 5 to carry out the suction process and start a new round of suction- Compression-exhaust-expansion-suction cycle. At the same time, the left cylinder performs a cycle of exhaust-expansion-suction-compression-exhaust.

When an accident occurs, such as a fault or error in the control of the moving magnet oscillating motor, causing the piston 1 to hit the exhaust valve plate 7, the piston 1 will collide with the anti-collision gasket on the exhaust valve plate, causing the exhaust valve plate 7 to push the preload spring 8. The exhaust valve plate 7 is opened as a whole, and the compressed gas and the piston 1 enter the exhaust chamber, which avoids the severe damage of the piston 1 or the exhaust valve plate 7 or both of them due to head-on collision between the piston 1 and the exhaust valve plate 7 as a result of. And when the moving magnet oscillating motor returns to normal, the exhaust valve plate 7 returns to its original position under the action of the pre-tension spring 8, and the compressor continues to run stably.

The gas bearing assembly of the present invention can be applied to other existing linear compressor assemblies, as long as part of the cylinder exhaust gas is introduced into the gas bearing by using the pressure difference between the cylinder exhaust and suction, oil-free lubrication can be realized, that is, other linear compressor applications The gas bearing of the present invention should also belong to the protection scope of the present invention. The moving magnet linear oscillating motor and oil-free lubrication technology of the present invention can be applied in combination with other exhaust valve structures. A new type of linear compressor composed of the moving magnet linear oscillating motor of the present invention, the oil-free lubrication technology and the exhaust mechanism of other structures should also belong to the protection scope of the present invention.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (7)

1. A counter-moving linear compressor is characterized in that it comprises a casing (13), a linear motor and two cylinders (5), wherein: The two ends of the casing (13) are provided with end covers (6), and the casing (13) is provided with an organic casing air intake hole and a casing exhaust hole; The linear motor is arranged in the casing (13), which includes a piston (1), a permanent magnet (2), a coil (11) and a yoke (12), and the piston (1) is a symmetrical structure, on which There is a piston air intake hole, its two ends are provided with suction valves (10), the inside of the piston (1) is hollow, and the outer middle part is provided with a groove for embedding the permanent magnet (2), the piston (1) ) is also sleeved with a housing (4) that wraps the permanent magnet (2) inside, and the housing (4) is provided with a housing air inlet at a position corresponding to the piston air inlet, and the coil (11) Winding outside the casing (4) and facing the permanent magnet (2) inside the casing (4), the yoke (12) is arranged between the casing (4) and the casing (13) for Wrapping the coil (11) inside; The two cylinders (5) are respectively arranged at the two ends of the piston (1), one end of each cylinder (5) is inserted in the gap between the piston (1) and the housing (4), and the other end is connected to the The end caps (6) are connected together, and one end of the cylinder (5) inserted in the gap between the piston (1) and the housing (4) is used as a gas bearing, and holes evenly distributed along the circumference of the cylinder are opened on it, And the inside of one end of the cylinder (5) connected to the end cover is provided with an exhaust valve plate (7), and a pre-tension spring (8) is arranged between the exhaust valve plate (7) and the end cover (6). The exhaust valve plate (7) is also provided with an exhaust valve (9). In addition, the housing (4) is also provided with an air guide hole leading to the hole provided on the gas bearing, and the cylinder (5) is also provided with a Cylinder vent. 2. The counter-moving linear compressor according to claim 1, characterized in that the air intake hole of the casing and the air intake hole of the casing are connected through an air intake pipe (14). 3. The counter-moving linear compressor according to claim 1, characterized in that a resonant spring (3) is arranged between the gas bearing and the side wall of the groove of the piston (1), and the resonant spring (3) is sleeved on the on the piston (1). 4. The counter-acting linear compressor according to claim 1, characterized in that, the pre-tension spring (8) is installed on the end cover (6), and the exhaust valve plate (7) relies on the pre-tension spring (8) Compressed on the step surface inside the cylinder, the pre-tightening force of the pre-tightening spring (8) is greater than the exhaust pressure of the cylinder during normal operation of the compressor. 5. The counter-acting linear compressor according to claim 1, characterized in that a groove structure is opened on the side of the discharge valve plate (7) facing the suction valve (10), and the groove structure The structure is opposite to the suction valve (10), and its depth is greater than the thickness of the suction valve; the side of the exhaust valve plate (7) facing away from the suction valve (10) is also provided with a groove structure. 6. The counter-acting linear compressor according to any one of claims 1-5, characterized in that, the inner surface of the cylinder (5) is coated with a fluorocarbon nano-coating; the piston (1) and The contact surface of the cylinder is coated with fluorocarbon nano coating. 7. The counter-moving linear compressor according to any one of claims 1-6, characterized in that, a high temperature resistant anti-collision pad is arranged in the groove structure on the side of the exhaust valve plate facing the suction valve piece.