Compressor

Abstract

To provide a compressor capable of preventing a piston top that has dropped from affecting a member excluding a cylinder even when the piston top that moves vertically has dropped from a connecting rod.SOLUTION: A compressor 10 includes: a cylinder 22; a piston top 33 oscillating within the cylinder 22; a connecting rod 32 having one end side to which a crank shaft 24 is connected and the other end side to which the piston top 33 is connected; a crank case 21 that erects the cylinder 22 and accommodates the crank shaft 24; and a partition plate 50 for partitioning inside of the cylinder 22 and inside of the crank case 21 and having an opening 51 through which the connecting rod 32 is inserted. The size of the opening 51 is larger than that of a support part 32b that is a portion of the connecting rod 32 inserted through the opening 51 in upper surface view of the partition plate 50, and is smaller than a piston ring 35 that is the largest portion of the piston top 33.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to compressors. [Background technology]

[0002] Claim 1 of Patent Document 1 describes a reciprocating compressor comprising: a crankcase having a rotationally driven crankshaft; a cylinder containing a piston to form a compression chamber; a piston rod that reciprocates and connects the crankshaft and the piston via a cross guide mechanism provided between the crankcase and the cylinder; an oil thrower provided in a partition separating the cylinder and the cross guide mechanism, and into which the piston rod that penetrates the partition is slidably inserted; a diaphragm that compresses gas by reducing the volume of the diaphragm compression chamber; and a diaphragm rod that is connected to the crankshaft of the crankcase via a cross guide mechanism separate from the cross guide mechanism and reciprocates the diaphragm, wherein gas discharged from the compression chamber of the cylinder is discharged to the outside through the diaphragm compression chamber, and wherein a suction line of the cylinder is connected to a space on the partition wall side of the cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-155487 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 discloses a multi-stage compressor that combines a piston-type compressor mechanism and a diaphragm-type compressor mechanism. In the cylinder-piston compressor mechanism of the compressor, the piston is cylindrical so that the piston can move linearly within the cylinder. Therefore, even if the piston top were to fall off the connecting rod, the fallen piston top is unlikely to affect components other than the connecting rod. However, in a compressor in which the piston top oscillates within the cylinder, if the piston top falls off the connecting rod, the fallen piston top could affect components other than the connecting rod. The problem to be solved by the present disclosure is to provide a compressor in which, even if the swinging piston top falls off the connecting rod, the detached piston top is unlikely to affect components other than the connecting rod. [Means for solving the problem]

[0005] The compressor of the present disclosure includes a cylinder, a piston top that oscillates within the cylinder, a connecting rod having one end connected to a crankshaft and the other end connected to the piston top, a crankcase that holds the cylinder upright and houses the crankshaft, and a partition plate that separates the interior of the cylinder from the interior of the crankcase and has an opening through which the connecting rod is inserted, wherein the size of the opening, when viewed from above, of the partition plate is larger than the portion of the connecting rod that inserts through the opening and smaller than the largest portion of the piston top. [Effects of the Invention]

[0006] According to the present disclosure, a compressor can be provided in which, even if the swinging piston top falls off the connecting rod, the fallen piston top is unlikely to affect components other than the connecting rod. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a compressor of the present disclosure. [Figure 2] FIG. 2 is a diagram showing the internal structure of a compressor body. [Figure 3A] FIG. 2 is a front view of the piston top and the connecting rod. [Figure 3B] FIG. 2 is a cross-sectional view of a piston top and a connecting rod. [Figure 4A] FIG. 10 is a diagram showing the position of the piston top when the crank angle is 0 degrees. [Figure 4B] FIG. 10 is a diagram showing the position of the piston top when the rocking angle is maximum. [Figure 4C] FIG. 10 is a diagram showing the position of the piston top when the piston top is at bottom dead center. [Figure 4D] FIG. 10 is a diagram showing the position of the piston top when the rocking angle is minimum. [Figure 4E] FIG. 10 is a diagram showing the position of the piston top when the piston top is at top dead center. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a perspective view of a partition plate according to another embodiment. [Figure 8] FIG. 10 is a perspective view of a partition plate according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, modes for carrying out the present disclosure (hereinafter referred to as "embodiments") will be described with reference to the drawings. In the following description of one embodiment, other embodiments applicable to the one embodiment will also be described as appropriate. The present disclosure is not limited to the one embodiment described below, and different embodiments can be combined with each other or modified as desired without significantly impairing the effects of the present disclosure. Furthermore, the same components will be given the same reference numerals, and redundant descriptions will be omitted. Furthermore, components having the same functions will be given the same names. The contents shown are merely schematic, and for convenience of illustration, changes may be made from the actual configuration within the scope of not significantly impairing the effects of the present disclosure, and some components may be omitted or modified between drawings. Furthermore, the same embodiment does not necessarily have to include all of the configurations.

[0009] FIG. 1 is a front view of a compressor 10 according to the present disclosure. The compressor 10 (particularly the compressor body 1) is a structure that compresses gas, and is, for example, an oil-free compressor. Therefore, the compressor 10 does not require oil, such as lubricating oil, for its operation (e.g., the sliding of a piston top 33 (FIG. 2) inside a cylinder 22 (FIG. 2)). The compressor 10 is, for example, a rocking piston compressor, and its specific configuration, type, model, application, and the like are not particularly limited. In a rocking piston compressor, the piston top 33 is driven integrally with a connecting rod 32 (FIG. 2) as the connecting rod 32 is driven. The compressor 10 includes a compressor body 1, an electric motor 2 that drives the compressor body 1, a tank 3 that stores gas discharged from the compressor body 1, and an operating unit 7 that receives control operations for the compressor 10. The operating unit 7 is operated, for example, by a user standing in front of the compressor 10. The internal structure of the compressor body 1 will be described later with reference to FIG.

[0010] The compressor body 1 is fixed on top of the tank 3. A crankshaft 24 (FIG. 2) constituting the compressor body 1 is disposed parallel to the rotation shaft (not shown) of the electric motor 2. A pulley 4 (compressor pulley) is fixed to the crankshaft 24. The pulley 4 has blades (not shown) and generates cooling air toward the compressor body 1 as the pulley 4 rotates, thereby promoting heat dissipation from the compressor body 1. A pulley 5 (electric motor pulley) is fixed to the rotation shaft (not shown) of the electric motor 2. A belt 6 (transmission belt) is wound around the pulleys 4 and 5 to transmit power between the pulleys 4 and 5. When the rotation shaft of the electric motor 2 rotates, the pulley 5, belt 6, and pulley 4 rotate. This causes the crankshaft 24 to which the pulley 4 is fixed to rotate, causing the compressor body 1 to compress the gas.

[0011] 1, for the sake of simplicity, the compressor body 1 and the electric motor 2, which is separate from the compressor body 1, are connected via a belt 6. However, the compressor body 1 and the electric motor 2 may be integrally configured by directly joining the crankshaft 24 and the rotating shaft of the electric motor 2 using a joining mechanism (not shown) such as a coupling.

[0012] 2 is a diagram showing the internal structure of the compressor body 1. The compressor body 1 includes, as elements of the compressor 10, a cylinder 22, a cylinder head 23, a valve plate 26, a connecting rod 32, a piston top 33, a crankcase 21, and a partition plate 50. Therefore, the compressor 10 includes these components.

[0013] The cylinder 22 is a structure that protrudes vertically from the crankcase 21, for example, upward (or in another direction). The cylinder 22 and the crankcase 21 are separate members (components), and the cylinder 22 is fixed to the upper surface of the crankcase 21 with fasteners (not shown, bolts, etc.). The cylinder 22 is hollow and has, for example, a circular interior shape, and is, for example, a metal cylinder. A piston top 33 is slidably housed inside the cylinder 22. A connecting rod 32 is connected to the piston top 33. In the illustrated example, only one cylinder 22 is provided. A valve plate 26 that closes the upper opening of the cylinder 22 is provided at the upper end of the cylinder 22 (the side opposite to the side connected to the crankcase 21). A cylinder head 23 is provided above the valve plate 26.

[0014] Fig. 3A is a front view of the piston top 33 and the connecting rod 32. Fig. 3B is an exploded perspective view of the piston top 33 and the connecting rod 32. The line segment 28, the center 33b, the partition plate 50, and the opening 51 will be described later.

[0015] The piston top 33 is a structure that swings (and, for example, reciprocates up and down) within the cylinder 22. The piston top 33 is a separate member (component) from the connecting rod 32, but they are fixed (fastened) together with a fastener 36 (bolt, screw, etc.) so that they move as a unit. That is, the connecting rod 32 is a structure in which the crankshaft 24 (FIG. 2) is connected to one end (for example, the lower end) and the piston top 33 is connected to the other end (for example, the upper end). The piston top 33 and one end of the connecting rod 32 are connected by the fastener 36. The connection is made at a connection portion 32a that is a part of the connecting rod 32. The fastener 36 is inserted in the reciprocating direction through through holes (not shown) formed in the piston top 33 and the connecting rod 32, respectively.

[0016] A piston insert 41 made of, for example, metal is placed on the upper surface 32c of the connecting rod 32. An edge 41a of the piston insert 41 is fitted inside the piston top 33. This secures the piston insert 41 to the piston top 33. A fastener 36 also secures the piston insert 41 to the connecting rod 32. As a result, the piston top 33 and the connecting rod 32 are secured together via the fastener 36 and the piston insert 41. A hollow portion 41b is formed between the piston insert 41 and the connecting rod 32.

[0017] The outer peripheral surface 33a of the piston top 33 has a spherical surface with a diameter slightly smaller than that of the inner peripheral surface 22a (FIG. 2) of the cylinder 22. The outer peripheral surface 33a that comes into contact with the inner peripheral surface 22a and the upper surface 33c of the piston top 33 that faces the valve plate 26 (FIG. 2) are made of a wear-resistant resin. A piston ring 35 fits into a ring groove 33d provided in the piston top 33 with a certain gap. The piston ring 35 functions as a sealing material.

[0018] The piston top 33 smoothly reciprocates (reciprocating) and oscillates within the cylinder 22. For this reason, the portion of the piston top 33 that comes close to or slides against the interior of the cylinder 22 has a substantially spherical shape. A compression chamber 34 (FIG. 2) in which gas is compressed is formed between an upper surface 33c, which is the leading edge of the piston top 33, and the inner circumferential surface 22a (FIG. 2) of the cylinder 22.

[0019] The connecting rod 32 includes a connection portion 32a, a support portion 32b, and a bearing attachment portion 31. The connection portion 32a is the end of the connecting rod 32, and as described above, is the portion to which the piston top 33 is connected. The connection portion 32a is a relatively thick portion located above the fastener 36 inserted into the through-hole. The connection portion 32a has a circular shape in a top view of the connecting rod 32. The support portion 32b is a portion connected to the connection portion 32a on the side opposite the fixed side (connection side) of the piston top 33. The support portion 32b is a portion that is relatively thinner than the connection portion 32a. The support portion 32b has a rectangular shape (the corners may be chamfered) that is smaller than the connection portion 32a in a top view of the connecting rod 32. The bearing attachment portion 31 is the end of the connecting rod 32 opposite the side where the connection portion 32a is located. The bearing attachment portion 31 is a circular portion to which the crankshaft 24 is connected. The crankshaft 24 is rotatably connected to the bearing attachment portion 31. The bearing attachment portion 31 has a shape larger than the support portion 32b when viewed from the front of the connecting rod 32 (as shown in FIGS. 3A and 3B).

[0020] Returning to Figure 2, the crankcase 21 is a structure that houses the cylinder 22 and the crankshaft 24. The cylinder 22 stands upright from the crankcase 21, for example, in an upward direction. The crankcase 21 is hollow. The crankshaft 24 is rotatably supported in the front-to-rear direction at approximately the center inside the crankcase 21.

[0021] In the compressor main body 1, rotation of the crankshaft 24 applies a rotational force to the other end of the connecting rod 32. This causes the piston top 33 in the cylinder 22 to swing together with one end of the connecting rod 32. As a result, gas is drawn into the compression chamber 34 from outside the cylinder 22, and the gas compressed in the compression chamber 34 is discharged into the tank 3. In addition, along with the expansion and compression in the compression chamber 34, the gas in the crankcase 21 is also repeatedly expanded and compressed. For this reason, gas flows into and is discharged from the crankcase 21 via the breathing filter 27, which communicates between the inside and outside of the crankcase 21.

[0022] In the example of the present disclosure, for the sake of simplicity, the compressor body 1 is shaped as a one-cylinder, one-stage compressor having only one pair of piston tops 33 and cylinders 22, but the compressor body 1 may also be a compressor having multiple piston tops 33 and cylinders 22 arranged in series or radially relative to the crankshaft 24.

[0023] FIG. 4A shows the position of the piston top 33 when the crank angle is 0 degrees. FIG. 4A and FIGS. 4B to 4E, which will be described later, show the state when the crankshaft 24 rotates once. FIG. 4A shows the relative positions of a line segment 28 connecting the center 31a of the bearing mount 31 (FIG. 3A) and the center 33b of the outer circumferential surface 33a (FIG. 3A), an upper surface 33c of the piston top 33 (FIG. 3A), and the center of rotation 24a of the crankshaft 24 when the crank angle is 0 degrees. The upper surface 33c extends horizontally. However, because the center of rotation 24a of the crankshaft 24 is misaligned with the cylinder center L, when the center 31a is located at the top end of the rotation range of the bearing mount 31 (shown by the dashed line in the figure), the upper surface 33c is not perpendicular to the line segment 28. The cylinder center L is a straight line extending directly downward (vertically) from the center 33b.

[0024] 4B is a diagram showing the position of piston top 33 when oscillation angle θ is at its maximum (crank angle 90 degrees). Oscillation angle θ, which is the angle between cylinder center L and line segment 28, is at its maximum. Top surface 33c extends at an angle relative to the horizontal. Center 31a is located in the center in the up-down direction within the rotation range of bearing mount portion 31, so top surface 33c is not perpendicular to line segment 28.

[0025] 4C is a diagram showing the position of the piston top 33 when the piston top 33 is at bottom dead center. The rotation center 24a is located on the line segment 28. The center 31a is located at a position slightly shifted from the lowest end of the rotation range of the bearing mount portion 31.

[0026] 4D is a diagram showing the position of the piston top 33 when the oscillation angle θ is minimum (crank angle 270 degrees). The oscillation angle θ is extremely small. The upper surface 33c extends at an angle relative to the horizontal. The center 31a is located in the vertical center of the rotation range of the bearing mount portion 31, so the upper surface 33c is not perpendicular to the line segment 28.

[0027] 4E is a diagram showing the position of piston top 33 when piston top 33 is at top dead center. Center of rotation 24a is located on a straight line obtained by extending line segment 28 toward center of rotation 24a.

[0028] Returning to Figure 2, as described above, the cylinder 22 is fixed to the top surface of the crankcase 21 by a fastener. However, the partition plate 50 is interposed between the cylinder 22 and the crankcase 21. Therefore, the partition plate 50 can be simply sandwiched when assembling the cylinder 22 to the crankcase 21, improving the ease of assembling the partition plate 50. The partition plate 50 separates the interior of the cylinder 22 from the interior of the crankcase 21, and has an opening 51 through which the connecting rod 32 is inserted.

[0029] FIG. 5 is a perspective view of the partition plate 50. The partition plate 50 has a rectangular shape with chamfered corners. The partition plate 50 has a shape that prevents it from protruding outside the cylinder 22 when the cylinder 22 is assembled to the crankcase 21. However, the material, thickness, shape, size, etc. of the partition plate 50 are not particularly limited as long as the strength of the partition plate can be ensured. Circular openings 55 provided at the four corners of the partition plate 50 are openings through which fasteners (not shown, bolts, etc.) for fastening the cylinder 22 to the crankcase 21 are passed. The openings 55 have an inner diameter that allows the fasteners to be inserted therethrough.

[0030] The opening 51 is disposed in the center of the partition plate 50. In the example of the present disclosure, the opening 51 has a shape that combines a circular opening 52 and a rectangular opening 53. However, the opening 51 may have a shape that is composed of only at least one of the openings 52 and 53.

[0031] Opening 53 is formed to overlap opening 52. The length L1 of opening 53 in the short direction is greater than the neck width of connecting rod 32. The length L2 of opening 53 in the long direction is approximately the same as (for example, within ±10%) the inner diameter of cylinder 22. Therefore, opening 52, which has an inner diameter D1 shorter than length L2, is positioned so as to narrow the internal cross-sectional area of ​​cylinder 22, which has a circular inner shape.

[0032] The size of opening 51, when viewed from above partition plate 50 (as viewed from above compressor 10 and compressor body 1; the same applies below), is larger than the portion of connecting rod 32 that passes through opening 51 (for example, support portion 32b shown in FIGS. 3A and 3B ) and smaller than the largest portion of piston top 33 (for example, piston ring 35). This prevents partition plate 50 from interfering with the up and down movement of connecting rod 32 (oscillation of piston top 33) when connecting rod 32 moves up and down. In addition, even if piston top 33 should fall off connecting rod 32, the fallen piston top 33 can be retained inside cylinder 22, making it less likely that the fallen piston top 33 will affect components other than connecting rod 32. Therefore, the size (minimum value) of the opening 51 is set to a dimension such that the rod portion (support portion 32b) of the connecting rod 32 does not come into contact with the partition plate 50 within the range from the maximum swing angle (crank angle 90 degrees) in FIG. 4B to the minimum swing angle (crank angle 270 degrees) in FIG. 4D.

[0033] 6 is a top view of the partition plate 50. In addition to the opening 51, Fig. 6 also shows the outer diameter of the piston ring 35 and the outer edge of the connection portion 32a of the connecting rod 32 (the largest part of the connecting rod 32).

[0034] As shown in FIG. 6 , the connecting portion 32a, which is the uppermost portion of the connecting rod 32, has a circular shape when viewed from above the partition plate 50. The diameter of the connecting portion 32a is shorter than the diameter of the opening 52 that forms the opening 51. Therefore, the opening 51 does not obstruct the connecting rod 32 as it moves up and down. On the other hand, the outer diameter of the piston ring 35 (the size of the longest portion of the piston top 33) is longer than the diameter of the opening 52 that forms the opening 51. Therefore, even if the piston top 33 were to fall off the connecting rod 32, the detached piston top 33 can be prevented from dropping below the partition plate 50.

[0035] Thus, the piston ring 35, which is the largest part of the piston top 33, is larger than the connecting portion 32a of the connecting rod 32 where the piston top 33 is connected. The opening 51 is also larger than the connecting portion 32a and is sized so as not to interfere with the connecting rod 32 (support portion 32b) that moves left and right. This allows the piston top 33 to be lowered close to the partition plate 50, widening the sliding range of the piston top 33 and improving compression efficiency. It also prevents the piston top 33 from falling off the partition plate 50.

[0036] Returning to FIG. 5, and explaining based on FIG. 5, the inner diameter D1 of opening 52 of opening 51 is slightly larger than the connecting portion 32a which is the joint between the connecting rod 32 and the piston top 33. Specifically, for example, the inner diameter D1 is greater than 1 time and not greater than 1.1 times the outer diameter of the circular connecting portion 32a. Also, the inner diameter D1 is slightly smaller than the piston top 33 (particularly, the annular piston ring 35 provided on the piston top 33). Specifically, for example, the inner diameter D1 is less than 1 time and not less than 0.9 times the outer diameter of the piston ring 35.

[0037] As described above, opening 51 has a shape that corresponds to the shape (outer shape) of connecting portion 32a of connecting rod 32 where it connects to piston top 33. In the illustrated example, connecting portion 32a is circular in top view, as described above. Therefore, opening 51 has circular opening 52. By doing so, opening 51 can be made just the right size, which can both suppress interference with the drive of connecting rod 32 and ensure the strength of partition plate 50.

[0038] Note that "a shape corresponding to the shape of the connection portion 32a" means, for example, that when viewed from above the partition plate 50, the shape of the connection portion 32a with the piston top 33 is similar to the shape of the opening 51, but they do not have to be strictly similar.

[0039] 3A and 4C, when the piston top 33 is positioned closest to the crankcase 21 (at the bottom in the illustrated example), the connecting portion 32a fits into the opening 51 of the partition plate 50. This allows the piston top 33 to be lowered close to the partition plate 50, widening the sliding range of the piston top 33 and improving compression efficiency.

[0040] The opening 51 has a shape that corresponds to the shape of the portion of the connecting rod 32 that passes through the opening 51 when the piston top 33 swings. In the example of the present disclosure, the opening 51 has a rectangular opening 53 that corresponds to the shape of the support portion 32b, which is the portion of the connecting rod 32 that passes through the opening 51. This prevents the partition plate 50 from interfering with the support portion 32b when the piston top 33 swings.

[0041] "A shape corresponding to the shape of support portion 32b" means, for example, that the shape of support portion 32b and the shape of opening 53 are similar when viewed from above on partition plate 50, but they do not need to be strictly similar. Furthermore, the size of support portion 32b when viewed from above can vary in the height direction of connecting rod 32. Therefore, it is preferable that the size of opening 53 be larger than the size of support portion 32b (rod portion) that passes through opening 51 when connecting rod 32 moves up and down.

[0042] In the example of the present disclosure, when the piston top 33 is at bottom dead center ( FIGS. 3A and 4C ), depending on the stroke length, the connecting portion 32a fits into the opening 51 of the partition plate 50, and the entire support portion 32b is located closer to the crankcase 21 than the partition plate 50. Therefore, by providing the opening 52, the opening 51 widens in the center of the partition plate 50, preventing the partition plate 50 from interfering with the connecting portion 32a of the connecting rod 32. However, when the connecting portion 32a is located above the partition plate 50, the opening 51 only needs to be large enough to ensure a space that does not interfere with the support portion 32b when the connecting rod 32 swings.

[0043] 7 is a perspective view of a partition plate 50 of another embodiment. In addition to the opening 51 (first opening), the partition plate 50 has an opening 57 (second opening) that connects the inside of the cylinder 22 with the inside of the crankcase 21. The provision of the opening 57 makes it easier for blow-by in the cylinder 22 to flow into the crankcase 21, and suppresses deterioration of the piston top 33 due to a rise in temperature.

[0044] A plurality of openings 57 are arranged along the edge of opening 51 so as to surround opening 51. Openings 57 are arranged line-symmetrically about the longitudinal direction of opening 51. However, the arrangement of openings 57 is not limited to the example in FIG.

[0045] 8 is a perspective view of a partition plate 50 according to another embodiment. The partition plate 50 is an assembly 60 of divided bodies 61, which are formed by dividing the partition plate 50 into a plurality of (for example, two) bodies so as to separate the openings 51. Although the divided bodies 61 are shown separately arranged in FIG. 8, in reality, the divided bodies 61 are joined together and interposed between the cylinder 22 and the crankcase 21.

[0046] As described above, the connecting rod 32 passes through the opening 51. For this reason, it may be difficult to pass the connecting rod 32 through the opening 51 depending on the dimensions and shape of the connecting rod 32, the state in which the connecting rod 32 is assembled to the piston top 33, and other factors. To address this issue, segments 61 formed to divide the opening 51 are positioned to sandwich the connecting rod 32 from multiple directions, and the segments 61 are joined together, making it possible to pass the connecting rod 32 through the opening 51. This makes it possible to position the partition plate 50 in the desired position, even if the connecting rod 32 and the piston top 33 have already been assembled and the connecting rod 32 cannot be passed through the opening 51 in the configuration shown in FIG. 5 above.

[0047] The multiple segments 61 have the same shape. Therefore, when arranging the segments 61 around the connecting rod 32, the segments 61 can be arranged without having to consider the relative positions of the segments 61, thereby improving assembly ease.

[0048] The joint surface 61a between the segments 61 is defined by a line segment L4 connecting the edge 51a of the opening 51 and the outer edge 50a of the partition plate 50 in a top view of the partition plate 50. The line segment L4 extends in a direction other than the front side of the compressor 10 (in the illustrated example, the left-right direction of the compressor 10). That is, of the outer edges of the segments 61 that form the joint surface 61a, the edge (joint surface 61a) that faces another segment 61 faces in a direction other than the front side of the compressor 10. This configuration prevents driving noise from the connecting rod 32 that drives the cylinder 22 and the crankcase 21 from leaking to the front side through the gap between the opposing joint surfaces 61a. This configuration reduces the noise perceived by the worker, who is usually present in front of the compressor 10.

[0049] The line segment L4 may be made up of only straight lines, a combination of straight lines and curved lines, or only curved lines. Furthermore, the line segment L4 may be made up of only a single line segment without bending, or may be made up of multiple line segments (at least one of straight lines and curved lines) with one or more bends.

[0050] Furthermore, the openings 52 have an angular shape (a linear shape) instead of the circular shape in the example of Fig. 4. This makes it easier to process, for example, a metal plate to manufacture the divided body 65. [Explanation of symbols]

[0051] 1 Compressor body 10 Compressor 2 electric motor 21 Crankcase 22 cylinders 22a Inner surface 23 Cylinder head 24 crankshaft 24a Center of rotation 26 Valve plate 27 Breathing Filter 28 line segments 3 Tank 31 Bearing mounting part 31a center 32 Connecting rod 32a Connection 32b Support part 32c top surface 33 Piston top 33 In case of piston top 33a Outer surface 33b center 33c top surface 33d ring groove 34 Compression chamber 35 Piston rings 36 Fixtures 4 pulleys 41 Piston insert 41a Edge 41b Hollow part 5 pulleys 50 Divider 50a outer edge 51 Opening (1st opening) 51a Edge 52 Aperture 53 Aperture 55 Aperture 57 Opening (Second Opening) 6 Belt 60 Aggregate 61 Split body 61a Joint surface 7 Control section D1 Inner diameter L Cylinder center L1 length L2 length L4 line segment θ Oscillation angle

Claims

1. A cylinder; a piston top that swings within the cylinder; a connecting rod having one end connected to a crankshaft and the other end connected to the piston top; a crankcase that supports the cylinder and houses the crankshaft; a partition plate that separates an interior of the cylinder from an interior of the crankcase and has an opening through which the connecting rod is inserted, When viewed from above, the size of the opening is larger than the portion of the connecting rod that passes through the opening and smaller than the largest portion of the piston top. A compressor characterized by:

2. 2. The compressor according to claim 1, The opening has a shape corresponding to the shape of the connecting portion of the connecting rod that is connected to the piston top. A compressor characterized by:

3. 3. The compressor according to claim 2, The opening has a shape that corresponds to the shape of the portion of the connecting rod that passes through the opening when the piston top swings. A compressor characterized by:

4. 3. The compressor according to claim 2, When the piston top is positioned closest to the crankcase, the connecting portion fits into the opening of the partition plate. A compressor characterized by:

5. 2. The compressor according to claim 1, the largest portion of the piston top is larger than a portion of the connecting rod that is connected to the piston top; The opening is larger than the connection portion. A compressor characterized by:

6. 2. The compressor according to claim 1, The partition plate has, in addition to the first opening as the opening, a second opening that communicates the inside of the cylinder with the inside of the crankcase. A compressor characterized by:

7. 2. The compressor according to claim 1, The partition plate is an assembly of divided bodies obtained by dividing the partition plate into a plurality of parts so as to separate the opening. A compressor characterized by:

8. 8. The compressor according to claim 7, a joint surface between the divided bodies is formed by a line segment connecting an edge of the opening and an outer edge of the partition plate when viewed from above the partition plate, The line segment extends in a direction other than the front side of the compressor. A compressor characterized by:

9. 8. The compressor according to claim 7, The plurality of divided bodies have the same shape. A compressor characterized by:

10. 2. The compressor according to claim 1, The cylinder and the crankcase are separate members, The partition plate is interposed between the cylinder and the crankcase. A compressor characterized by:

11. 2. The compressor according to claim 1, The compressor is an oil-free compressor. A compressor characterized by:

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