Linear motor device

Abstract

The invention relates to the technical field of straight lines, and provides a linear motor device which comprises a motor shell, an air cylinder, a piston and an electromagnetic conversion structure, a containing cavity is formed in the piston, the electromagnetic conversion structure is arranged in the containing cavity, and the electromagnetic conversion structure achieves conversion of mechanical energy and electric energy along with reciprocating motion of the piston. The electromagnetic conversion structure is arranged in the containing cavity of the piston and can synchronously reciprocate along with the piston, the internal space of the piston is effectively utilized through the structure, compared with a traditional motor structure, the overall size of the motor is effectively reduced, the structure is more compact, and the problem that the occupied space of the motor is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of linear motors, and in particular to a linear motor device. Background Art

[0002] Linear motors achieve the conversion between mechanical energy and electrical energy through reciprocating motion, and do not require complex intermediate transmission devices. They have low vibration and noise. The motor's piston uses leaf spring support or air flotation technology to achieve frictionless piston movement. The system reliability and efficiency are very high. Linear motors can be used as electric motors to compress gas or as generators to output electrical work. When used as a compressor, the linear motor converts electrical energy into mechanical energy and generates pressure waves; when used as a generator, the linear motor reciprocates under the impetus of pressure waves to change the coil magnetic flux and convert mechanical energy into electrical output.

[0003] like Figure 1 As shown, the structure of the traditional linear motor includes a motor housing 1, a cylinder 2, a piston 3, a mover 43, an inner stator 41 and an outer stator 42, wherein the cylinder 2 is arranged in the motor housing 1, a back cavity 22 is formed between the cylinder 2 and the motor housing 1, the cylinder 2 and the back cavity 22 are filled with gas, the piston 3 is arranged in the cylinder 2, the piston 3 reciprocates in the cylinder 2, the mover 43 is arranged outside the cylinder 2 and is connected to the piston 3 to maintain synchronous movement with the piston 3, the inner stator 41 and the outer stator 42 are arranged on both sides of the mover 43, and the piston 3 drives the mover 43 to reciprocate synchronously, so that the mover 43 changes the magnetic flux of the coils in the inner stator 41 and the outer stator 42, thereby realizing the conversion between mechanical energy and electrical energy.

[0004] However, in this traditional structure, when the impedance angle of the compressed gas is close to the standing wave phase of 90°, the required piston diameter is large, and the size of the magnetic circuit structure of the motor is relatively small. If the traditional layout method is still followed and the magnetic circuit structure is designed on the periphery of the cylinder, the total diameter of the motor will be larger, resulting in the motor occupying a larger space, which is not conducive to practical application. Summary of the invention

[0005] In view of this, the present invention proposes a linear motor device to solve or at least partially solve the technical defects existing in the prior art.

[0006] The present invention provides a linear motor device, comprising:

[0007] Motor housing;

[0008] A cylinder, wherein the cylinder is disposed in the motor housing and divides the interior of the motor housing into a compression chamber and a back chamber, wherein the inner side of the cylinder is the compression chamber, and the back chamber is between the cylinder and the motor housing;

[0009] A piston, the piston is movably disposed in the cylinder and can reciprocate along the axial direction of the cylinder, and the piston has an accommodating cavity inside;

[0010] An electromagnetic conversion structure is arranged in the accommodating cavity, and the electromagnetic conversion structure realizes the conversion of mechanical energy and electrical energy as the piston moves back and forth.

[0011] According to the linear motor device provided by the present invention, the electromagnetic conversion structure includes:

[0012] One of the stator component and the mover (43) is connected to the cylinder (2), and the other is connected to the inner wall of the accommodating chamber (31).

[0013] According to the linear motor device provided by the present invention, the stator component includes an inner stator and an outer stator, the inner stator and the outer stator are respectively connected to the cylinder, and the outer stator is arranged on the outer side of the inner stator;

[0014] A mover is connected to the inner wall of the accommodating cavity and is arranged between the inner stator and the outer stator.

[0015] According to the linear motor device provided by the present invention, one end of the accommodating cavity is a closed end, and the other end of the accommodating cavity is an open end, the mover is connected to the side wall of the closed end, and the inner stator and the outer stator extend into the accommodating cavity from the open end.

[0016] According to the linear motor device provided by the present invention, the electromagnetic conversion structure further includes:

[0017] A stator frame, one end of which is connected to a side of the cylinder away from the piston, and the other end of which is connected to the inner stator and the outer stator, respectively, so that the inner stator and the outer stator are connected to the cylinder;

[0018] A connecting frame, one end of which is connected to the closed end side wall of the accommodating cavity, and the other end of which is connected to the mover, so that the mover is connected to the piston.

[0019] According to the linear motor device provided by the present invention, the mover is a permanent magnet, and an induction coil is provided in the outer stator.

[0020] According to the linear motor device provided by the present invention, a gas spring chamber is formed between the accommodating chamber and the stator frame, and the pressure in the gas spring chamber can be adjusted to adapt to the movement frequency of the piston.

[0021] According to the linear motor device provided by the present invention, a plurality of convection holes are evenly distributed on the stator frame, the plurality of convection holes can connect the gas spring cavity and the back cavity, and the plurality of convection holes are used to adjust the pressure in the gas spring cavity.

[0022] According to the linear motor device provided by the present invention, the cylinder is connected to the motor housing through a flange.

[0023] According to the linear motor device provided by the present invention, an air floating structure is provided on the piston, and the air floating structure is used to support the piston in the cylinder.

[0024] Beneficial effects: The linear motor device provided by the present invention includes a motor housing, a cylinder, a piston and an electromagnetic conversion structure. The piston has a accommodating cavity inside, and the electromagnetic conversion structure is arranged in the accommodating cavity. The electromagnetic conversion structure realizes the conversion of mechanical energy and electrical energy as the piston reciprocates. By arranging the electromagnetic conversion structure in the accommodating cavity of the piston and being able to reciprocate synchronously with the piston, this structure effectively utilizes the space inside the piston. Compared with the traditional motor structure, it effectively reduces the overall size of the motor, makes the structure more compact, and also improves the reliability of the moving parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0026] Figure 1 It is a schematic diagram of the structure of a traditional linear motor;

[0027] Figure 2 Schematic diagram of the structure of the linear motor device in an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Motor housing; 2. Cylinder; 21. Compression chamber; 22. Back chamber; 3. Piston; 31. Accommodating chamber; 4. Electromagnetic conversion structure; 41. Inner stator; 42. Outer stator; 421. Induction coil; 43. Mover; 44. Stator frame; 45. Connecting frame; 5. Gas spring chamber; 6. Flange. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Linear motors achieve the conversion between mechanical energy and electrical energy through reciprocating motion, and do not require complex intermediate transmission devices. They have low vibration and noise. The motor's piston uses leaf spring support or air flotation technology to achieve frictionless piston movement. The system reliability and efficiency are very high. Linear motors can be used as electric motors to compress gas or as generators to output electrical work. When used as a compressor, the linear motor converts electrical energy into mechanical energy and generates pressure waves; when used as a generator, the linear motor reciprocates under the impetus of pressure waves to change the coil magnetic flux and convert mechanical energy into electrical output.

[0035] like Figure 1As shown, the structure of the traditional linear motor includes a motor housing 1, a cylinder 2, a piston 3, a mover 43, an inner stator 41 and an outer stator 42, wherein the cylinder 2 is arranged in the motor housing 1, a back cavity 22 is formed between the cylinder 2 and the motor housing 1, the cylinder 2 and the back cavity 22 are filled with gas, the piston 3 is arranged in the cylinder 2, the piston 3 reciprocates in the cylinder 2, the mover 43 is arranged outside the cylinder 2 and is connected to the piston 3 to maintain synchronous movement with the piston 3, the inner stator 41 and the outer stator 42 are arranged on both sides of the mover 43, and the piston 3 drives the mover 43 to reciprocate synchronously, so that the mover 43 changes the magnetic flux of the coils in the inner stator 41 and the outer stator 42, thereby realizing the conversion between mechanical energy and electrical energy.

[0036] However, in this traditional structure, when the impedance angle of the compressed gas is close to the standing wave phase of 90°, the required piston diameter is large, and the size of the magnetic circuit structure of the motor is relatively small. If the traditional layout method is still followed and the magnetic circuit structure is designed on the periphery of the cylinder, the total diameter of the motor will be relatively large, which is not conducive to practical application.

[0037] In the embodiment of the present invention, the electromagnetic conversion structure is arranged in the accommodating cavity of the piston and is able to reciprocate synchronously with the piston. This structure effectively utilizes the space inside the piston. Compared with the traditional motor structure, it effectively reduces the overall size of the motor, makes the structure more compact, and improves the reliability of the moving parts.

[0038] Combine the following Figure 1 and Figure 2 The linear motor device of the present invention is described.

[0039] like Figure 2 As shown, an embodiment of the present invention provides a linear motor device, including a motor housing 1, a cylinder 2, a piston 3 and an electromagnetic conversion structure 4, wherein the cylinder 2 is arranged in the motor housing 1, and the interior of the motor housing 1 is divided into a compression chamber 21 and a back chamber 22, the inner side of the cylinder 2 is the compression chamber 21, and the back chamber 22 is between the cylinder 2 and the motor housing 1, the piston 3 is movably arranged in the cylinder 2, and can reciprocate along the axial direction of the cylinder 2, the piston 3 has an accommodating chamber 31, and the electromagnetic conversion structure 4 is arranged in the accommodating chamber 31, the electromagnetic conversion structure 4 can specifically include a closed circuit coil and a magnetic rod, or a stator and a mover arranged with each other, and generate an induced current by utilizing the electromagnetic induction phenomenon, through the movement of the magnetic rod or the mover, when a part of the conductor of the closed circuit cuts the magnetic flux line, an induced current is generated, and the conversion of mechanical energy and electrical energy is realized. The specific arrangement structure of the closed circuit coil and the magnetic rod or the arrangement structure of the stator and the mover is not limited in this embodiment, as long as the form of the electromagnetic conversion structure 4 can realize the conversion of mechanical energy and electrical energy with the reciprocating motion of the piston 3.

[0040] In this embodiment, the electromagnetic conversion structure 4 is arranged in the accommodating chamber 31 of the piston 3, and is able to reciprocate synchronously with the piston 3. This structure effectively utilizes the space inside the piston 3. Compared with the traditional motor structure, it effectively reduces the overall size of the motor, makes the structure more compact, and improves the reliability of the moving parts.

[0041] In some embodiments of the present invention, the electromagnetic conversion structure 4 includes a stator component and a mover 43, such as Figure 2 In the structure, the stator component is connected to the cylinder 2, and the mover 43 is connected to the inner wall of the accommodating chamber 31. Specifically, the stator component includes an inner stator 41 and an outer stator 42, wherein the inner stator 41 and the outer stator 42 are respectively connected to the cylinder 2, the outer stator 42 is arranged on the outer side of the inner stator 41, the mover 43 is connected to the inner wall of the accommodating chamber 31, and the mover 43 is arranged between the inner stator 41 and the outer stator 42, the mover 43 reciprocates synchronously with the piston 3, and the mover 43 changes the magnetic flux in the inner stator 41 and the outer stator 42, generating alternating current to output electric work to the external circuit.

[0042] In some embodiments of the present invention, one end of the accommodating chamber 31 is a closed end, and the other end of the accommodating chamber 31 is an open end. The mover 43 is arranged in the accommodating chamber 31 and connected to the side wall of the closed end. The inner stator 41 and the outer stator 42 extend into the accommodating chamber 31 from the open end of the accommodating chamber 31. This structural setting enables the mover 43 to move synchronously with the piston 3, while the inner stator 41 and the outer stator 42 are fixed. The movement of the mover 43 changes the magnetic flux in the inner stator 41 and the outer stator 42, generating alternating current to output electric work to the external circuit.

[0043] In some other optional embodiments of the present invention, the stator component can also be arranged in the piston 3 and connected to the inner wall of the accommodating chamber 31 in the piston 3, while the mover 43 is connected to the cylinder 2, so that the stator component and the piston 3 can also reciprocate synchronously. With the reciprocating motion of the piston 3, the mover 43 changes the magnetic flux in the inner stator 41 and the outer stator 42, generating alternating current to output electric work to the external circuit.

[0044] In some embodiments of the present invention, the electromagnetic conversion structure 4 further includes a stator frame 44 and a connecting frame 45. Both the stator frame 44 and the connecting frame 45 are annular structures. One end of the stator frame 44 is connected to the side of the cylinder 2 away from the piston 3, and the other end of the stator frame 44 is connected to the inner stator 41 and the outer stator 42 respectively, so that the inner stator 41 and the outer stator 42 are connected to the cylinder 2, and the mover 43 is connected to the closed end side wall of the accommodating cavity 31 through one end of the connecting frame 45, and the other end of the connecting frame 45 is connected to the mover 43, so that the mover 43 is connected to the piston 3. The inner stator 41, the outer stator 42 and the mover 43 are placed in the accommodating cavity 31 in the piston 3, and are fixedly connected by the stator frame 44 and the connecting frame 45 respectively. This structure reduces the total diameter of the linear motor, makes the structure more compact, and also improves the reliability between the moving parts of the piston 3, the inner stator 41, the outer stator 42 and the mover 43.

[0045] Furthermore, the mover 43 is selected as a permanent magnet, and an induction coil 421 is provided in the outer stator 42. The permanent magnet changes the magnetic flux in the induction coil 421 as the piston 3 reciprocates, and the induction coil 421 generates alternating current to output electric work to the external circuit.

[0046] In some embodiments of the present invention, a gas spring chamber 5 is formed between the accommodating chamber 31 and the stator frame 44. The air pressure in the gas spring chamber 5 can be adjusted. By adjusting the air pressure in the gas spring chamber 5, the different movement frequencies of the piston 3 can be adapted, thereby improving the stability and working efficiency of the linear motor device.

[0047] In some other embodiments of the present invention, a plurality of convection holes are evenly distributed on the stator frame 44, and the plurality of convection holes can connect the gas spring chamber 5 with the back chamber 22. The pressure in the gas spring chamber 5 is adjusted through the plurality of convection holes to adapt to different movement frequencies of the piston 3, thereby improving the stability and working efficiency of the linear motor device.

[0048] In order to further ensure the stability of the linear motor device, the cylinder 2 can be connected to the motor housing 1 through the flange 6, and the piston 3 can also be provided with an air flotation structure, and the piston 3 is supported in the cylinder 2 by the air flotation structure, that is, the piston is supported radially by the air flotation structure. Specifically, an air cavity is provided inside the piston 3, and a plurality of mounting holes are provided on the circumferential side wall of the piston 3. Each mounting hole is connected to the air cavity and the outside of the piston 3 along the radial direction of the piston 3. Each mounting hole is arranged around the central axis of the piston 3, and the central angle between any two adjacent mounting holes is equal. A capillary is passed through each mounting hole, and the capillary is sealed and connected to the mounting hole. The mounting hole and the capillary form a throttle structure. The throttle structure forms an air film between the piston 3 and the inner wall of the cylinder 2, thereby realizing the floating of the piston 3. By evenly arranging the mounting holes on the side wall of the piston 3, the circumference of the piston 3 can be evenly stressed, so that the piston 3 can be stably suspended in the cylinder 2.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. 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 embodiments of the present invention.

Claims

1. A linear motor device, characterized in that: include: Motor housing (1); A cylinder (2), the cylinder (2) being arranged in the motor housing (1) and dividing the interior of the motor housing (1) into a compression chamber (21) and a back chamber (22), the inner side of the cylinder (2) being the compression chamber (21), and the back chamber (22) being between the cylinder (2) and the motor housing (1); A piston (3), the piston (3) being movably disposed in the cylinder (2) and capable of reciprocating along the axial direction of the cylinder (2), and the piston (3) having an accommodating chamber (31) therein; An electromagnetic conversion structure (4), wherein the electromagnetic conversion structure (4) is arranged in the accommodating chamber (31), and the electromagnetic conversion structure (4) can realize the conversion of mechanical energy and electrical energy as the piston (3) reciprocates.

2. The linear motor device according to claim 1, characterized in that: The electromagnetic conversion structure (4) comprises: The stator component and the mover (43), one of which is connected to the cylinder (2), and the other is connected to the inner wall of the accommodating chamber (31).

3. The linear motor device according to claim 2, characterized in that: The stator component comprises an inner stator (41) and an outer stator (42), wherein the inner stator (41) and the outer stator (42) are respectively connected to the cylinder (2), and the outer stator (42) is arranged on the outer side of the inner stator (41); A mover (43), the mover (43) is connected to the inner wall of the accommodating cavity (31) and is arranged between the inner stator (41) and the outer stator (42).

4. The linear motor device according to claim 3, characterized in that: One end of the accommodating cavity (31) is a closed end, and the other end of the accommodating cavity (31) is an open end. The mover (43) is connected to the side wall of the closed end, and the inner stator (41) and the outer stator (42) extend from the open end into the accommodating cavity (31).

5. The linear motor device according to claim 4, characterized in that: The electromagnetic conversion structure (4) further comprises: a stator frame (44), one end of the stator frame (44) being connected to a side of the cylinder (2) away from the piston (3), and the other end of the stator frame (44) being connected to the inner stator (41) and the outer stator (42) respectively, so that the inner stator (41) and the outer stator (42) are connected to the cylinder (2); A connecting frame (45), one end of the connecting frame (45) is connected to the closed end side wall of the accommodating chamber (31), and the other end of the connecting frame (45) is connected to the mover (43), so that the mover (43) is connected to the piston (3).

6. The linear motor device according to any one of claims 3 to 5, characterized in that: The mover (43) is a permanent magnet, and an induction coil (421) is provided inside the outer stator (42).

7. The linear motor device according to claim 5, characterized in that: A gas spring chamber (5) is formed between the accommodating chamber (31) and the stator frame (44), and the pressure in the gas spring chamber (5) can be adjusted to adapt to the movement frequency of the piston (3).

8. The linear motor device according to claim 7, characterized in that: A plurality of convection holes are evenly distributed on the stator frame (44), the plurality of convection holes being capable of connecting the gas spring chamber (5) with the back chamber (22), and the plurality of convection holes being used to adjust the pressure in the gas spring chamber (5).

9. The linear motor device according to claim 1, characterized in that: The cylinder (2) is connected to the motor housing (1) via a flange (6).

10. The linear motor device according to claim 9, characterized in that: An air floating structure is provided on the piston (3), and the air floating structure is used to support the piston (3) in the cylinder (2).

Images