A two-stage piston refrigeration compressor

Abstract

The utility model discloses a two -stage piston type refrigeration compressor, including compressor casing and permanent magnet motor, permanent magnet motor is located in the compressor casing, both sides of compressor casing are equipped with two low pressure level cylinders and two high pressure level cylinders respectively, still be equipped with exhaust valve on compressor casing, still include intermediate cooler, intermediate cooler fixed connection is in on compressor casing, and intermediate cooler communicates two low pressure level cylinders, two high pressure level cylinders and exhaust valve. The utility model discloses through with two low pressure level cylinders, two high pressure level cylinders, exhaust valve and intermediate cooler are connected, and two -stage compression technology divides the whole compression process into two stages, has reduced the compression ratio and energy consumption of each stage, has improved the gas transmission coefficient and volumetric efficiency of compressor simultaneously, makes it can adapt to lower evaporation temperature requirement, satisfies the application occasion such as refrigerated warehouse, frozen food processing and needs to reach lower evaporation temperature.

Description

Technical Field

[0001] This utility model belongs to the field of compressor equipment technology, specifically relating to a two-stage reciprocating refrigeration compressor. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, compresses it by driving a piston through the operation of a motor, and then discharges high-temperature, high-pressure refrigerant gas through the discharge pipe, providing power for the refrigeration cycle.

[0003] In many practical applications, compressors need to operate under high compression ratios. Using single-stage compression can lead to several problems, such as: increased exhaust temperature, which can easily damage the equipment; decreased lubricant viscosity with increasing temperature, necessitating the use of high-ignition-point lubricants; a significant reduction in the compressor's unit cooling capacity and unit volumetric cooling capacity; and increased power consumption and a decreased coefficient of performance (COP). Therefore, when the compression ratio is too high, using a single-stage compression cycle is uneconomical and even impossible. Utility Model Content

[0004] The purpose of this invention is to solve the aforementioned technical problems in the prior art and to provide a two-stage reciprocating refrigeration compressor. This compressor connects two low-pressure stage cylinders, two high-pressure stage cylinders, an exhaust valve, and an intercooler. The refrigerant vapor, initially compressed in the low-pressure stage cylinders, is cooled by the intercooler before entering the high-pressure stage cylinders for further compression. In the high-pressure stage cylinders, the pressure and temperature of the refrigerant vapor further increase. The high-pressure stage vapor is then discharged through the exhaust valve after cooling in the intercooler. This two-stage compression technology divides the entire compression process into two phases, reducing the compression ratio and energy consumption of each stage while improving the compressor's delivery coefficient and volumetric efficiency. This allows it to adapt to lower evaporation temperature requirements, meeting the needs of applications such as cold storage and frozen food processing where lower evaporation temperatures are required.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A two-stage reciprocating refrigeration compressor includes a compressor housing and a permanent magnet motor, with the permanent magnet motor housed within the compressor housing. Two low-pressure stage cylinders and two high-pressure stage cylinders are respectively located on both sides of the compressor housing. An exhaust valve is also provided on the compressor housing. An intercooler is also included, fixedly connected to the compressor housing, and connects the two low-pressure stage cylinders, the two high-pressure stage cylinders, and the exhaust valve. This invention connects the two low-pressure stage cylinders, the two high-pressure stage cylinders, the exhaust valve, and the intercooler. The refrigerant vapor, initially compressed in the low-pressure stage cylinders, is cooled by the intercooler before entering the high-pressure stage cylinders for further compression. In the high-pressure stage cylinders, the pressure and temperature of the refrigerant vapor are further increased. The high-pressure stage vapor is then cooled by the intercooler and discharged through the exhaust valve. The two-stage compression technology divides the entire compression process into two stages, reducing the compression ratio and energy consumption of each stage while improving the compressor's delivery coefficient and volumetric efficiency. This allows it to adapt to lower evaporation temperature requirements, meeting the needs of applications such as cold storage and frozen food processing where lower evaporation temperatures are required.

[0006] Furthermore, the compressor housing has a cylinder head corresponding to the two low-pressure stage cylinders, with an exhaust port on the cylinder head and an inlet port on the intercooler. The exhaust port and the inlet port are connected by a connecting pipe. This design allows the refrigerant vapor to directly enter the intercooler for cooling after compression in the low-pressure stage cylinders, avoiding the overheating problem that may occur in traditional single-stage compressors where the refrigerant vapor directly enters the high-pressure stage cylinder after compression, thus improving compression efficiency and system stability.

[0007] Furthermore, the compressor housing has cylinder heads two corresponding to the two high-pressure stage cylinders. Each cylinder head two has an exhaust port two and an intake port two. The intercooler has an exhaust port one and an intake port three. Exhaust port one and intake port two are connected by a connecting pipe two, and exhaust port two and intake port three are connected by a connecting pipe three. This design allows the refrigerant vapor to undergo secondary cooling in the intercooler after compression in the high-pressure stage cylinders, ensuring that the temperature of the refrigerant vapor discharged from the high-pressure stage cylinders remains within a safe range, thus avoiding system failures and increased energy consumption due to excessively high temperatures.

[0008] Furthermore, the intercooler is equipped with a second vent, which is connected to the exhaust valve via a fourth connecting pipe. This design allows the refrigerant vapor to be directly discharged through the exhaust valve after being cooled by the intercooler, avoiding the complex process of transmission through additional pipelines required in traditional compressors. This simplifies the system structure and improves operating efficiency and reliability.

[0009] Furthermore, a mounting slot is provided on the top of the compressor housing, and the intercooler is fixedly connected to the mounting slot by a fixing mechanism. This design makes the installation of the intercooler more stable and reliable, avoiding problems such as reduced cooling effect and system failure caused by insecure installation.

[0010] Furthermore, the fixing mechanism includes diagonal bracing assemblies and support brackets. The diagonal bracing assemblies are located on both sides of the compressor housing and abut against the side wall of the mounting groove. The support brackets are located at both ends of the compressor housing, and their bottoms are fixedly connected to the mounting groove. This dual fixing by the diagonal bracing assemblies and support brackets ensures the stability and reliability of the intercooler during operation, preventing reduced cooling performance and system malfunctions caused by insecure fixing.

[0011] Furthermore, the diagonal bracing assembly includes a base and a telescopic block. The base abuts against the side wall of the mounting groove, and a mounting seat is formed by an upward protrusion at the center of the base. The mounting seat has a mounting cavity with a top opening. The telescopic block is movably connected to the mounting cavity. Connecting screw holes are evenly distributed on both sides of the telescopic block, and connecting holes are provided on both sides of the mounting seat. The connecting holes communicate with the mounting cavity, and connecting screws are screwed into the connecting holes and tightened into the connecting screw holes. Through the movable connection of the telescopic block and the tightening of the connecting screws, the base can abut against the side wall of the mounting groove, ensuring the stability and reliability of the diagonal bracing assembly under different working conditions.

[0012] Furthermore, the support bracket includes a clamping sleeve, an adjusting screw, and a support block. The clamping sleeve comprises an upper semi-circular sleeve and a lower semi-circular sleeve, which are fixedly connected by a fastening screw and nut. The bottom of the lower semi-circular sleeve has a threaded hole, and the top of the adjusting screw is threaded into the threaded hole. The bottom of the adjusting screw is rotatably connected to the top of the support block, which is fixedly connected to the mounting groove. The clamping of the clamping sleeve increases the stability of the intercooler. The adjusting screw adjusts the distance between the support block and the intercooler, allowing the support block to rest firmly in the mounting groove, increasing the stability of the intercooler installation and preventing reduced cooling performance and system malfunctions due to insecure fixing.

[0013] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: This invention connects two low-pressure stage cylinders, two high-pressure stage cylinders, an exhaust valve, and an intercooler. The refrigerant vapor, initially compressed in the low-pressure stage cylinders, is cooled by the intercooler before entering the high-pressure stage cylinders for further compression. In the high-pressure stage cylinders, the pressure and temperature of the refrigerant vapor are further increased. After being cooled by the intercooler, the vapor is discharged through the exhaust valve. This two-stage compression technology divides the entire compression process into two phases, reducing the compression ratio and energy consumption of each stage while improving the compressor's delivery coefficient and volumetric efficiency. This allows the compressor to adapt to lower evaporation temperature requirements, meeting the needs of applications such as cold storage and frozen food processing where lower evaporation temperatures are required.

[0014] In this invention, the compressor housing has cylinder heads corresponding to the two low-pressure stage cylinders, each with an exhaust port. The intercooler has an inlet port, and the exhaust port and inlet port are connected by a connecting pipe. This design allows refrigerant vapor to directly enter the intercooler for cooling after compression in the low-pressure stage cylinders, avoiding the overheating problem that can occur in traditional single-stage compressors where the refrigerant vapor directly enters the high-pressure stage cylinder after compression. This improves compression efficiency and system stability.

[0015] The fixing mechanism of this utility model includes a diagonal brace assembly and a support bracket. The diagonal brace assembly is located on both sides of the compressor housing and abuts against the side wall of the mounting groove. The support bracket is located at both ends of the compressor housing, and the bottom of the support bracket is fixedly connected to the mounting groove. Through the dual fixing of the diagonal brace assembly and the support bracket, the stability and reliability of the intercooler during operation are ensured, avoiding reduced cooling effect and system failures caused by insecure fixing. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a two-stage reciprocating refrigeration compressor according to the present invention; Figure 2 This is a schematic diagram of the compressor housing in this utility model; Figure 3 This is a schematic diagram of the structure of the intercooler in this utility model; Figure 4 This is a schematic diagram of the support bracket in this utility model; Figure 5 This is a schematic diagram of the diagonal brace component in this utility model.

[0017] In the diagram, 1-compressor housing; 2-low-pressure stage cylinder; 3-high-pressure stage cylinder; 4-exhaust valve; 5-intercooler; 6-cylinder head 1; 7-connecting pipe 1; 8-cylinder head 2; 9-connecting pipe 2; 10-connecting pipe 3; 11-connecting pipe 4; 12-mounting slot; 13-diagonal brace assembly; 14-support bracket; 15-base; 16-telescopic block; 17-mounting seat; 18-connecting screw; 19-upper semi-circular sleeve; 20-adjusting screw; 21-support block; 22-lower semi-circular sleeve. Detailed Implementation

[0018] like Figures 1 to 5 As shown, this utility model discloses a two-stage reciprocating refrigeration compressor, which includes a compressor housing 1 and a permanent magnet motor. The permanent magnet motor is located inside the compressor housing 1. Two low-pressure stage cylinders 2 and two high-pressure stage cylinders 3 are respectively provided on both sides of the compressor housing. An exhaust valve 4 is also provided on the compressor housing 1. The compressor housing 1 also includes an intercooler 5, which is fixedly connected to the compressor housing 1 and connects the two low-pressure stage cylinders 2, the two high-pressure stage cylinders 3 and the exhaust valve 4.

[0019] The compressor housing 1 has cylinder heads 6 corresponding to the two low-pressure stage cylinders 2. Each cylinder head 6 has an exhaust port, and the intercooler 5 has an inlet port. The exhaust port and the inlet port are connected by a connecting pipe 7. This design allows the refrigerant vapor to directly enter the intercooler 5 for cooling after compression in the low-pressure stage cylinder 2, avoiding the overheating problem that may occur in traditional single-stage compressors where the refrigerant vapor directly enters the high-pressure stage cylinder 3 after compression. This improves compression efficiency and system stability.

[0020] The compressor housing 1 has cylinder heads 8 corresponding to the two high-pressure stage cylinders 3. Each cylinder head 8 has an exhaust port 2 and an intake port 2. The intercooler 5 has an exhaust port 1 and an intake port 3. The exhaust port 1 and intake port 2 are connected by a connecting pipe 2 9, and the exhaust port 2 and intake port 3 are connected by a connecting pipe 3 10. This design allows the refrigerant vapor to undergo secondary cooling in the intercooler 5 after compression in the high-pressure stage cylinders 3, ensuring that the temperature of the refrigerant vapor discharged from the high-pressure stage cylinders 3 is within a safe range, thus avoiding system failures and increased energy consumption due to excessively high temperatures.

[0021] The intercooler 5 is equipped with a second air outlet, which is connected to the exhaust valve 4 via a connecting pipe 11. This design allows the refrigerant vapor to be directly discharged through the exhaust valve 4 after being cooled by the intercooler 5, avoiding the complex process of passing through additional pipelines after cooling in traditional compressors, simplifying the system structure, and improving operating efficiency and reliability.

[0022] The compressor housing 1 has a mounting groove 12 on its top, and the intercooler 5 is fixedly connected to the mounting groove 12 by a fixing mechanism. This design makes the installation of the intercooler 5 more stable and reliable, avoiding the reduction in cooling effect and system failure caused by insecure installation.

[0023] The fixing mechanism includes a diagonal brace assembly 13 and a support bracket 14. The diagonal brace assembly 13 is located on both sides of the compressor housing 1 and abuts against the side wall of the mounting groove 12. The support bracket 14 is located at both ends of the compressor housing 1, and its bottom is fixedly connected to the mounting groove 12. Through the dual fixing of the diagonal brace assembly 13 and the support bracket 14, the stability and reliability of the intercooler 5 during operation are ensured, avoiding reduced cooling effect and system failures caused by insecure fixing.

[0024] The diagonal brace assembly 13 includes a base 15 and a telescopic block 16. The base 15 abuts against the side wall of the mounting groove 12. A mounting seat 17 is formed by an upward protrusion at the center of the base 15. The mounting seat 17 has a mounting cavity with a top opening. The telescopic block 16 is movably connected to the mounting cavity. Connecting screw holes are evenly distributed on both sides of the telescopic block 16. Connecting holes are provided on both sides of the mounting seat 17, and the connecting holes communicate with the mounting cavity. Connecting screws 18 are screwed into the connecting holes and tightened in the connecting screw holes. Through the movable connection of the telescopic block 16 and the tightening of the connecting screws 18, the base 15 can abut against the side wall of the mounting groove 12, ensuring the stability and reliability of the diagonal brace assembly 13 under different working conditions.

[0025] The support bracket 14 includes a clamping sleeve, an adjusting screw 20, and a support block 21. The clamping sleeve includes an upper semi-circular sleeve 19 and a lower semi-circular sleeve 22, which are fixedly connected by a fastening screw and nut. The bottom of the lower semi-circular sleeve 22 has a threaded hole, the top of which is threaded into the adjusting screw 20, and the bottom of which is rotatably connected to the top of the support block 21. The support block 21 is fixedly connected to the mounting groove 12. The clamping of the clamping sleeve increases the stability of the intercooler 5. The adjusting screw 20 adjusts the distance between the support block 21 and the intercooler 5, allowing the support block 21 to be supported on the mounting groove 12, increasing the stability of the intercooler 5 installation and avoiding reduced cooling effect and system failure due to insecure fixing.

[0026] This invention connects two low-pressure stage cylinders 2, two high-pressure stage cylinders 3, an exhaust valve 4, and an intercooler 5. The refrigerant vapor, initially compressed by the low-pressure stage cylinders 2, is cooled by the intercooler 5 and then enters the high-pressure stage cylinders 3 for deep compression. In the high-pressure stage cylinders 3, the pressure and temperature of the refrigerant vapor further increase. After being cooled by the intercooler 5, the vapor is discharged through the exhaust valve 4. The two-stage compression technology divides the entire compression process into two stages, reducing the compression ratio and energy consumption of each stage, while improving the compressor's delivery coefficient and volumetric efficiency. This allows it to adapt to lower evaporation temperature requirements, meeting the needs of applications such as cold storage and frozen food processing where lower evaporation temperatures are required.

[0027] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A two-stage piston refrigeration compressor, comprising a compressor housing and a permanent magnet motor, the permanent magnet motor is arranged in the compressor housing, two low-pressure stage cylinders and two high-pressure stage cylinders are arranged on both sides of the compressor housing respectively, and an exhaust valve is further arranged on the compressor housing, characterized in that: The intermediate cooler is fixedly connected to the compressor shell and is communicated with the two low-pressure stage cylinders, the two high-pressure stage cylinders and the exhaust valve.

2. A two-stage piston refrigeration compressor according to claim 1, characterized in that: The compressor shell is provided with a cylinder cover one corresponding to the two low-pressure stage cylinders, the cylinder cover one is provided with an exhaust hole one, the intermediate cooler is provided with an air inlet hole one, and the exhaust hole one and the air inlet hole one are communicated through a connecting pipe one.

3. A two-stage piston refrigeration compressor according to claim 1, characterized in that: The compressor shell is provided with a cylinder cover two corresponding to the two high-pressure stage cylinders, the cylinder cover two is respectively provided with an exhaust hole two and an air inlet hole two, the intermediate cooler is provided with an air outlet hole one and an air inlet hole three, the air outlet hole one and the air inlet hole two are communicated through a connecting pipe two, and the exhaust hole two and the air inlet hole three are communicated through a connecting pipe three.

4. A two-stage piston refrigeration compressor according to claim 1, characterized in that: The intermediate cooler is provided with an air outlet hole two, and the air outlet hole two and the exhaust valve are communicated through a connecting pipe four.

5. A two-stage piston refrigeration compressor according to claim 1, characterized in that: The top of the compressor shell is provided with a mounting groove, and the intermediate cooler is fixedly connected to the mounting groove through a fixing mechanism.

6. A two-stage piston refrigeration compressor according to claim 5, characterized in that: The fixing mechanism comprises an inclined support assembly and a support bracket, the inclined support assembly is arranged on both sides of the compressor shell, the inclined support assembly abuts against the side wall of the mounting groove, the support bracket is arranged at both ends of the compressor shell, and the bottom of the support bracket is fixedly connected to the mounting groove.

7. A two-stage piston refrigeration compressor according to claim 6, characterized in that: The inclined support assembly comprises a base and an expansion block, the base abuts against the side wall of the mounting groove, the center of the base is upwardly protruded to form a mounting seat, the mounting seat is provided with an open-top mounting cavity, the expansion block is movably connected to the mounting cavity, the two sides of the expansion block are uniformly provided with connecting screw holes, the two sides of the mounting seat are provided with connecting holes, the connecting holes are communicated with the mounting cavity, connecting screws are screwed into the connecting holes, and the connecting screws are screwed into the connecting screw holes.

8. A two-stage piston refrigeration compressor according to claim 6, characterized in that: The support bracket comprises a clamping sleeve, an adjusting screw and a support block, the clamping sleeve comprises an upper semicircular sleeve and a lower semicircular sleeve, the upper semicircular sleeve and the lower semicircular sleeve are fixedly connected through a fastening screw and a nut, the bottom of the lower semicircular sleeve is provided with a threaded hole, the top of the adjusting screw is threadedly connected to the threaded hole, the bottom of the adjusting screw is rotatably connected to the top of the support block, and the support block is fixedly connected to the mounting groove.

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