Crankcase for refrigeration compressor

Abstract

A crankshaft placing hole is formed in the middle of a crankshaft box base, a gap-free crankshaft box cylinder body is installed at the position, close to one side, of the upper surface of the crankshaft box base, the gap-free crankshaft box cylinder body is in sliding fit with a piston, the piston is hinged to a connecting rod, the connecting rod is hinged to a crankshaft, and the crankshaft placing hole is formed in the middle of the crankshaft box base. The crankshaft is arranged in a crankshaft box shaft sleeve in a sleeved mode, and the crankshaft box shaft sleeve is installed at the crankshaft placing hole from the lower surface of the crankshaft box base and fixedly installed with the crankshaft box base. The crank case adopts a split installation method, the assembly process is changed, the integrity of the unnotched crank case cylinder body is kept, and compared with the situation that a connecting rod and a piston of a traditional crank case need to be assembled in the crank case cylinder body, the connecting rod and the piston can be placed in the unnotched crank case cylinder body after being assembled, so that the connecting rod and the piston are convenient to assemble. And the assembling flexibility is greatly improved.

Description

Technical Field

[0001] This utility model relates to liquid displacement machinery, specifically to a crankcase for a refrigeration compressor that is a part, component or accessory specifically designed for pumps or pumping systems for elastic fluids. Background Technology

[0002] Refrigeration compressors have a simple structure and can effectively produce compressed gas for refrigeration, making them widely used in air conditioning, refrigerators, and other fields. Reciprocating compressors, also known as piston compressors, are one of the oldest and most widely used compressor types in the refrigeration and air conditioning industry. Their basic working principle originates from the piston movement of an internal combustion engine, making them a positive displacement compressor. Their core mechanism involves an electric motor driving a crankshaft to rotate, which in turn drives a piston in a reciprocating linear motion within the cylinder via a connecting rod.

[0003] Traditional reciprocating compressors are cast in one piece, which inevitably requires openings in the crankcase cylinder bore to secure the connection between the piston and connecting rod. For example, the patent application CN116164027A, titled "A Piston-Type High-Efficiency Compressor Connecting Rod Structure and its Assembly Method," while avoiding the need for machining crescent grooves on the cylinder block by using separate machining and assembly of the connecting rod bore, negatively impacts the transmission precision between the connecting rod and crankshaft. Utility Model Content

[0004] The purpose of this utility model is to provide a split-type crankcase for a refrigeration compressor, which is convenient for processing, manufacturing, transportation and storage. A further purpose of this utility model is to design the crankcase in a split manner so that the piston and connecting rod can be assembled without machining grooves on the notched crankcase cylinder block, thus ensuring the integrity of the notched crankcase cylinder block and increasing the piston stroke.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0006] A crankcase for a refrigeration compressor includes a crankcase base with a crankshaft insertion hole in the middle. A notched crankcase cylinder is mounted on the upper surface of the crankcase base near one side. The notched crankcase cylinder slides with a piston. The piston is hinged to a connecting rod, which is hinged to the crankshaft. The crankshaft is sleeved in a crankcase bushing. The crankcase bushing is mounted from the lower surface of the crankcase base at the crankshaft insertion hole and is fixedly installed with the crankcase base.

[0007] Furthermore, one end of the connecting rod is provided with a connecting rod hole, and the piston is provided with a piston hole in the middle. The connecting rod hole and the piston hole are connected by a piston pin to achieve hinge connection, and the piston pin is located inside the piston.

[0008] Preferably, the bushing section of the unnotched crankcase cylinder body is unnotched, and the unnotched crankcase cylinder body does not overlap with the crankshaft insertion hole.

[0009] Furthermore, the crankshaft passes through the crankshaft insertion hole from the lower surface of the crankcase base, and the crankshaft crank is hinged to the connecting rod large hole of the connecting rod.

[0010] Furthermore, the crankshaft's crankshaft turntable and the crankpin are located on the upper surface of the crankcase base;

[0011] The majority of the crankshaft shaft portion is located on the lower surface of the crankcase base.

[0012] Furthermore, the bushing disc of the crankcase bushing is fitted to the lower surface of the crankcase base, the crankcase bushing is provided with a bushing mounting hole, and the crankcase base is provided with a base mounting hole, the bushing mounting hole and the base mounting hole are fitted together.

[0013] Furthermore, the area of ​​the bushing disc is larger than the area of ​​the crankshaft insertion hole, and the bushing disc covers the crankshaft insertion hole.

[0014] Furthermore, the rotary disk contact portion of the crankcase bushing engages with the crankshaft rotary disk.

[0015] Furthermore, the crankcase bushing is hollow, and the outer wall of the crankcase bushing is provided with a bushing disc portion, which divides the crankcase bushing into a rotary disc contact portion and a bushing portion.

[0016] Preferably, crankcase support feet are provided at the four corners of the lower surface of the crankcase base.

[0017] This invention has the following benefits:

[0018] Compared to existing technologies that compromise the structural integrity of the connection between the connecting rod and the crankshaft, this invention changes the assembly process by using a split-assembly method for the crankcase, thereby maintaining the integrity of the unbroken crankcase cylinder block. Compared to the traditional crankcase where the connecting rod and piston need to be assembled in the crankcase cylinder block, the connecting rod and piston of this invention can be placed into the unbroken crankcase cylinder block after assembly, greatly improving assembly flexibility. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the exploded structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the assembly cross-sectional structure of this utility model.

[0021] Figure 3This is a three-dimensional structural diagram of the present invention.

[0022] In the figure, 1-crankcase base, 11-crankcase support foot, 12-base mounting hole, 13-crankshaft insertion hole, 2-piston, 21-piston hole, 3-connecting rod, 31-connecting rod small hole, 32-connecting rod large hole, 4-piston pin, 5-crankshaft, 51-crankshaft rotary table, 52-crank crank, 6-crankcase bushing, 61-rotary table contact part, 62-shoulder part, 63-shoulder plate part, 64-shoulder mounting hole, 7-unnotched crankcase cylinder block. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0024] Example 1:

[0025] like Figures 1 to 3 As shown, a crankcase for a refrigeration compressor has a crankcase base 1 with a crankshaft insertion hole 13 in the middle. A notched crankcase cylinder 7 is installed on the upper surface of the crankcase base 1 near one side. The notched crankcase cylinder 7 is slidably fitted with a piston 2. The piston 2 is hinged to a connecting rod 3. The connecting rod 3 is hinged to a crankshaft 5. The crankshaft 5 is sleeved in a crankcase bushing 6. The crankcase bushing 6 is installed from the lower surface of the crankcase base 1 at the crankshaft insertion hole 13 and is fixedly installed with the crankcase base 1.

[0026] The crankcase of this utility model has the following structural and functional components:

[0027] A crankcase base 1, which is the main support structure of the crankcase, includes components such as a seamless crankcase bore 7, a crankshaft 5, and a crankcase bushing 6, all of which are mounted on the crankcase base 1. A crankshaft insertion hole 13 is provided in the central region of the crankcase base 1, and the crankshaft insertion hole 13 radially penetrates the crankcase base 1. The crankshaft insertion hole 13 is used to install and position the crankshaft 5 and the crankcase bushing 6. The crankcase base 1 also has a base mounting hole 12, which is arranged around the outside of the crankshaft insertion hole 13. The crankcase base 1 and the crankcase bushing 6 are fixedly connected through the base mounting hole 12.

[0028] A notched crankcase cylinder block 7 is fixedly installed on the upper surface of the crankcase base 1, near one side of the crankcase base 1. The notched crankcase cylinder block 7 does not have the crescent-shaped notch found on the piston cylinder block of a traditional crankcase. This is because traditional crankcases are all cast as a single piece, while the piston, connecting rod, and crankshaft are assembled later, leaving less space for these components.

[0029] This means that the fixing of the piston and connecting rod can only be completed within the piston cylinder body. Furthermore, traditional piston cylinders require the crankshaft and piston to be installed together at their respective positions within the piston cylinder before being connected by the connecting rod. Therefore, the assembly of the piston and connecting rod takes place inside the piston cylinder, necessitating the machining of openings in the piston cylinder body for installing pins that securely connect the connecting rod and piston.

[0030] Traditional piston cylinders suffer from bore strength issues due to notches in the cylinder body, increasing bore deformation and reducing compressor performance. In contrast, the comparative technology, by making the bore detachable, increases the assembly volume of the connecting rod's bore end, requiring additional fasteners to secure it. This affects the piston cylinder's range of motion during operation and its assembly with other components.

[0031] The central opening of the unnotched crankcase cylinder 7 is used to accommodate the piston 2. The piston 2 is configured to perform reciprocating linear motion within the cylinder 7.

[0032] The piston 2 is cylindrical, with the diameter of the two end cylinders being larger than that of the middle cylinder. At the position of the middle cylinder, there is a piston hole 21 for mounting the piston pin 4 and the connecting rod hole 31 of the connecting rod 3. The hole portion of the connecting rod hole 31 of the connecting rod 3 coincides and is aligned with the axis of the hole portion of the piston hole 21. The piston pin 4 passes through the piston hole 21 and the connecting rod hole 31 to fix the piston 2 and the connecting rod 3, thereby achieving a hinged connection.

[0033] Connecting rod 3 connects piston 2 and crankshaft 5. Connecting rod 3 converts the rotation of crankshaft 5 into reciprocating linear motion of piston 2 within the unnotched crankcase 7. One end of connecting rod 3 has a small connecting rod hole 31, and the other end has a large connecting rod hole 32. The small connecting rod hole 31 and piston hole 21 are hinged together by piston pin 4. After installation, piston pin 4 is positioned within both piston hole 21 and connecting rod hole 31.

[0034] The crankshaft 5 is a key component that transmits power and converts rotational motion into reciprocating motion of the piston. The crankshaft 5 includes a crankshaft shaft portion sleeved in the crankcase bushing, a crankshaft rotary disk 51 for eccentrically mounting the crank 52, and a crank 52 for hinged to the piston bore 32.

[0035] The crank 52 is the journal portion connecting the connecting rod bore 32. Its axis is eccentrically set with respect to the main rotation axis of the crankshaft 5, and this eccentricity determines the piston stroke. The crank 52 is hinged to the connecting rod bore 32 of the connecting rod 3.

[0036] The crankshaft 5 is installed by passing upward through the crankshaft insertion hole 13 from the lower surface of the crankcase base 1. The crankshaft rotary table 51 and crank 52 of the crankshaft 5 are mainly located on one side of the upper surface of the crankcase base 1, while the main journal portion or most of the shaft portion of the crankshaft 5 is located on one side of the lower surface of the crankcase base 1.

[0037] The crankcase bushing 6 is fitted onto the crankshaft shaft portion of the crankshaft 5 and covers the lower surface of the crankcase base 1. The lower end face of the crankshaft rotary disk 51 of the crankshaft 5 presses against the rotary disk contact portion 61 of the crankcase bushing 6. The lower end of the crankshaft shaft portion of the crankshaft 5 is hollow. The diameter of the crankshaft rotary disk 51 is smaller than that of the crankshaft insertion hole 13, and the crankshaft rotary disk 51 rotates within the crankshaft insertion hole 13.

[0038] To support the crankshaft 5 and ensure its smooth rotation, a crankcase bushing 6 is provided. The crankcase bushing 6 is installed on the lower surface of the crankcase base 1, covering the crankshaft insertion hole 13, and the rotary disc contact portion 61 extends into the crankshaft insertion hole 13. The thickness of the rotary disc contact portion 61 is less than the thickness of the crankshaft insertion hole 13. The crankcase bushing 6 is fixedly installed to the crankcase base 1.

[0039] The crankcase bushing 6 is a hollow structure, with its inner hole used to accommodate and support the crankshaft shaft portion of the crankshaft 5 and the crankshaft rotary disk 51. An integrally formed bushing disc portion 63 is provided on the outer wall of the crankcase bushing 6. The bushing disc portion 63 is a radially outward-extending disc. The bushing disc portion 63 divides the crankcase bushing 6 into two functional sections axially: the rotary disk contact portion 61 located above the bushing disc portion 63 and the bushing body portion 62 located below the bushing disc portion 63. The inner diameter of the crankcase bushing 6 matches the shaft diameter of the crankshaft shaft portion of the crankshaft 5.

[0040] In the installed state, the upper surface of the bushing disc 63 is in close contact with the lower surface of the crankcase base 1. For fixation, the bushing disc 63 is provided with a plurality of bushing mounting holes 64, which correspond one-to-one with the base mounting holes 12 on the crankcase base 1. The crankcase bushing 6 is securely mounted on the crankcase base 1 by fasteners passing through the bushing mounting holes 64 and the base mounting holes 12.

[0041] The coverage area of ​​the bushing disc 63 is larger than the opening area of ​​the crankshaft insertion hole 13. Therefore, when the bushing 6 is installed in place, the bushing disc 63 can completely cover the crankshaft insertion hole 13, enhancing the sealing performance.

[0042] Furthermore, the upper end face or specific contact area of ​​the rotary disc contact portion 61 of the crankcase bushing 6 is in contact with the lower surface or corresponding axial positioning surface of the crankshaft rotary disc 51. This contact fit is used to provide axial support and limit the axial movement of the crankshaft 5, as well as to serve as a bearing surface for the lubricating oil film.

[0043] Example 2:

[0044] The structure of this embodiment is the same as that of Embodiment 1, and the assembly process of this utility model is described in addition.

[0045] like Figures 1 to 3 As shown, a crankcase for a refrigeration compressor has a crankcase base 1 with a crankshaft insertion hole 13 in the middle. A notched crankcase cylinder 7 is installed on the upper surface of the crankcase base 1 near one side. The notched crankcase cylinder 7 is slidably fitted with a piston 2. The piston 2 is hinged to a connecting rod 3. The connecting rod 3 is hinged to a crankshaft 5. The crankshaft 5 is sleeved in a crankcase bushing 6. The crankcase bushing 6 is installed from the lower surface of the crankcase base 1 at the crankshaft insertion hole 13 and is fixedly installed with the crankcase base 1.

[0046] The crankcase of this utility model has the following structural and functional components:

[0047] A crankcase base 1, which is the main support structure of the crankcase, includes components such as a seamless crankcase bore 7, a crankshaft 5, and a crankcase bushing 6, all of which are mounted on the crankcase base 1. A crankshaft insertion hole 13 is provided in the central region of the crankcase base 1, and the crankshaft insertion hole 13 radially penetrates the crankcase base 1. The crankshaft insertion hole 13 is used to install and position the crankshaft 5 and the crankcase bushing 6. The crankcase base 1 also has a base mounting hole 12, which is arranged around the outside of the crankshaft insertion hole 13. The crankcase base 1 and the crankcase bushing 6 are fixedly connected through the base mounting hole 12.

[0048] A notched crankcase cylinder block 7 is fixedly installed on the upper surface of the crankcase base 1, near one side of the crankcase base 1. The notched crankcase cylinder block 7 does not have the crescent-shaped notch found on the piston cylinder block of a traditional crankcase. This is because traditional crankcases are all cast as a single piece, while the piston, connecting rod, and crankshaft are assembled later, leaving less space for these components.

[0049] This means that the fixing of the piston and connecting rod can only be completed within the piston cylinder body. Furthermore, traditional piston cylinders require the crankshaft and piston to be installed together at their respective positions within the piston cylinder before being connected by the connecting rod. Therefore, the assembly of the piston and connecting rod takes place inside the piston cylinder, necessitating the machining of openings in the piston cylinder body for installing pins that securely connect the connecting rod and piston.

[0050] Traditional piston cylinders suffer from bore strength issues due to notches in the cylinder body, increasing bore deformation and reducing compressor performance. In contrast, the comparative technology, by making the bore detachable, increases the assembly volume of the connecting rod's bore end, requiring additional fasteners to secure it. This affects the piston cylinder's range of motion during operation and its assembly with other components.

[0051] The central opening of the unnotched crankcase cylinder 7 is used to accommodate the piston 2. The piston 2 is configured to perform reciprocating linear motion within the cylinder 7.

[0052] The piston 2 is cylindrical, with the diameter of the two end cylinders being larger than that of the middle cylinder. At the position of the middle cylinder, there is a piston hole 21 for mounting the piston pin 4 and the connecting rod hole 31 of the connecting rod 3. The hole portion of the connecting rod hole 31 of the connecting rod 3 coincides and is aligned with the axis of the hole portion of the piston hole 21. The piston pin 4 passes through the piston hole 21 and the connecting rod hole 31 to fix the piston 2 and the connecting rod 3, thereby achieving a hinged connection.

[0053] Connecting rod 3 connects piston 2 and crankshaft 5. Connecting rod 3 converts the rotation of crankshaft 5 into reciprocating linear motion of piston 2 within the unnotched crankcase 7. One end of connecting rod 3 has a small connecting rod hole 31, and the other end has a large connecting rod hole 32. The small connecting rod hole 31 and piston hole 21 are hinged together by piston pin 4. After installation, piston pin 4 is positioned within both piston hole 21 and connecting rod hole 31.

[0054] The crankshaft 5 is a key component that transmits power and converts rotational motion into reciprocating motion of the piston. The crankshaft 5 includes a crankshaft shaft portion sleeved in the crankcase bushing, a crankshaft rotary disk 51 for eccentrically mounting the crank 52, and a crank 52 for hinged to the piston bore 32.

[0055] The crank 52 is the journal portion connecting the connecting rod bore 32. Its axis is eccentrically set with respect to the main rotation axis of the crankshaft 5, and this eccentricity determines the piston stroke. The crank 52 is hinged to the connecting rod bore 32 of the connecting rod 3.

[0056] The crankshaft 5 is installed by passing upward through the crankshaft insertion hole 13 from the lower surface of the crankcase base 1. The crankshaft rotary table 51 and crank 52 of the crankshaft 5 are mainly located on one side of the upper surface of the crankcase base 1, while the main journal portion or most of the shaft portion of the crankshaft 5 is located on one side of the lower surface of the crankcase base 1.

[0057] The crankcase bushing 6 is fitted onto the crankshaft shaft portion of the crankshaft 5 and covers the lower surface of the crankcase base 1. The lower end face of the crankshaft rotary disk 51 of the crankshaft 5 presses against the rotary disk contact portion 61 of the crankcase bushing 6. The lower end of the crankshaft shaft portion of the crankshaft 5 is hollow. The diameter of the crankshaft rotary disk 51 is smaller than that of the crankshaft insertion hole 13, and the crankshaft rotary disk 51 rotates within the crankshaft insertion hole 13.

[0058] To support the crankshaft 5 and ensure its smooth rotation, a crankcase bushing 6 is provided. The crankcase bushing 6 is installed on the lower surface of the crankcase base 1, covering the crankshaft insertion hole 13, and the rotary disc contact portion 61 extends into the crankshaft insertion hole 13. The thickness of the rotary disc contact portion 61 is less than the thickness of the crankshaft insertion hole 13. The crankcase bushing 6 is fixedly installed to the crankcase base 1.

[0059] The crankcase bushing 6 is a hollow structure, with its inner hole used to accommodate and support the crankshaft shaft portion of the crankshaft 5 and the crankshaft rotary disk 51. An integrally formed bushing disc portion 63 is provided on the outer wall of the crankcase bushing 6. The bushing disc portion 63 is a radially outward-extending disc. The bushing disc portion 63 divides the crankcase bushing 6 into two functional sections axially: the rotary disk contact portion 61 located above the bushing disc portion 63 and the bushing body portion 62 located below the bushing disc portion 63. The inner diameter of the crankcase bushing 6 matches the shaft diameter of the crankshaft shaft portion of the crankshaft 5.

[0060] In the installed state, the upper surface of the bushing disc 63 is in close contact with the lower surface of the crankcase base 1. For fixation, the bushing disc 63 is provided with a plurality of bushing mounting holes 64, which correspond one-to-one with the base mounting holes 12 on the crankcase base 1. The crankcase bushing 6 is securely mounted on the crankcase base 1 by fasteners passing through the bushing mounting holes 64 and the base mounting holes 12.

[0061] The coverage area of ​​the bushing disc 63 is larger than the opening area of ​​the crankshaft insertion hole 13. Therefore, when the bushing 6 is installed in place, the bushing disc 63 can completely cover the crankshaft insertion hole 13, enhancing the sealing performance.

[0062] Furthermore, the upper end face or specific contact area of ​​the rotary disc contact portion 61 of the crankcase bushing 6 is in contact with the lower surface or corresponding axial positioning surface of the crankshaft rotary disc 51. This contact fit is used to provide axial support and limit the axial movement of the crankshaft 5, as well as to serve as a bearing surface for the lubricating oil film.

[0063] After the notched crankcase cylinder block 7 is fixedly connected to the crankcase base 1 by welding or fasteners, the connecting rod 3 and piston 2 are first assembled using piston pin 4. Then, the assembled piston 2 is placed into the notched crankcase cylinder block 7, and the crankshaft 5 is installed into the crankcase bushing 6. The assembled crankshaft 5 is then inserted from below the crankcase base 1 through the crankshaft insertion hole 13, and the crankshaft 52 is assembled with the connecting rod large hole 32. Finally, the crankcase bushing 6 and the crankcase base 1 are fixedly installed using fasteners through the mating of the bushing mounting hole 64 and the base mounting hole 12.

Claims

1. A crankcase for a refrigeration compressor, characterized in that, A crankshaft insertion hole (13) is provided in the middle of the crankcase base (1). A notched crankcase cylinder (7) is installed on the upper surface of the crankcase base (1) near one side. The notched crankcase cylinder (7) is slidably engaged with the piston (2). The piston (2) is hinged to the connecting rod (3). The connecting rod (3) is hinged to the crankshaft (5). The crankshaft (5) is sleeved in the crankcase bushing (6). The crankcase bushing (6) is installed from the lower surface of the crankcase base (1) at the crankshaft insertion hole (13) and is fixedly installed with the crankcase base (1).

2. The crankcase for a refrigeration compressor according to claim 1, characterized in that, One end of the connecting rod (3) is provided with a connecting rod hole (31), and the piston is provided with a piston hole (21) in the middle. The connecting rod hole (31) and the piston hole (21) are connected by a piston pin (4) to achieve hinge connection. The piston pin (4) is located inside the piston (2).

3. A crankcase for a refrigeration compressor according to claim 1, characterized in that, The bushing section of the unnotched crankcase cylinder (7) is unnotched, and the unnotched crankcase cylinder (7) does not overlap with the crankshaft insertion hole (13).

4. A crankcase for a refrigeration compressor according to claim 1, 2, or 3, characterized in that, The crankshaft (5) passes through the crankshaft insertion hole (13) from the lower surface of the crankcase base (1), and the crank (52) of the crankshaft (5) is hinged to the connecting rod large hole (32) of the connecting rod (3).

5. A crankcase for a refrigeration compressor according to claim 4, characterized in that, The crankshaft (5) crankshaft turntable (51) and the crank (52) are located on the upper surface of the crankcase base (1); The majority of the crankshaft (5) is located on the lower surface of the crankcase base (1).

6. A crankcase for a refrigeration compressor according to claim 1, 2, 3, or 5, characterized in that, The bushing disc (63) of the crankcase bushing (6) is in contact with the lower surface of the crankcase base (1). The crankcase bushing (6) is provided with a bushing mounting hole (64), and the crankcase base (1) is provided with a base mounting hole (12). The bushing mounting hole (64) and the base mounting hole (12) are in cooperation.

7. A crankcase for a refrigeration compressor according to claim 6, characterized in that, The area of ​​the bushing disc (63) is larger than the area of ​​the crankshaft insertion hole (13), and the bushing disc (63) covers the crankshaft insertion hole (13).

8. A crankcase for a refrigeration compressor according to claim 5, characterized in that, The rotary disk contact portion (61) of the crankcase bushing (6) is in contact with the crankshaft rotary disk (51).

9. A crankcase for a refrigeration compressor according to claim 1, 2, 3, 5, 7, or 8, characterized in that, The crankcase bushing (6) is hollow, and the outer wall of the crankcase bushing (6) is provided with a bushing disc (63). The bushing disc (63) divides the crankcase bushing (6) into a rotary disc contact part (61) and a bushing part (62).

10. A crankcase for a refrigeration compressor according to any one of claims 1, 2, 3, 5, 7, or 8, characterized in that, Crankcase support feet (11) are provided at the four corners of the lower surface of the crankcase base (1).

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