Single-machine two-stage compressor with screw and piston connected in series

Abstract

The utility model relates to a single-machine two-stage compressor with a screw rod and a piston connected in series. The motor comprises a motor body and a rotor body, a motor stator and a motor rotor which are matched with each other are arranged in the motor body, one end of the rotor body is connected with one end of the motor body, and a male rotor and a female rotor which are meshed with each other are arranged in the rotor body. One end of the connecting machine body is connected with the other end of the rotor machine body, a worm gear and worm shell is fixed to the inner wall of a sealing plate of the connecting machine body, a worm gear and a worm which are matched with each other are arranged in the worm gear and worm shell, a driven bevel gear is arranged at one end of the worm, and a driving bevel gear is arranged at the rear end of the male rotor. One end of the connecting pipe is connected with a sealing plate of the connecting machine body, and the other end of the connecting pipe is connected with one end of the air cylinder machine body. The utility model has the advantages of reasonable structural design, reliable performance and low noise.

Description

Technical Field

[0001] The utility model relates to a single-unit two-stage compressor in which a screw and a piston are connected in series, belonging to the technical field of compressors. Background Art

[0002] The adaptability of a twin-screw single-unit two-stage compressor is poor. In applications with lower evaporation temperatures, the performance of a twin-screw single-unit two-stage compressor will be greatly limited and cannot meet the working requirements under large pressure difference conditions of low evaporation or high condensation.

[0003] To improve the adaptability of single-unit two-stage compressors, single-unit two-stage compressors with a screw and piston in series are currently available. However, existing single-unit two-stage compressors with a screw and piston in series have poor safety and generate relatively loud noise during operation. This is because the structural design of existing single-unit two-stage compressors with a screw and piston in series is unreasonable. The screw and piston units are generally connected by a reduction gear, and the low-frequency pulsation of the piston unit can easily affect the rotation of the screw unit, shortening the life of the screw bearings, adversely affecting the screw unit, compromising safety, and causing relatively loud noise.

[0004] Currently, there is no single-unit two-stage compressor with a screw and a piston in series that has a reasonable structural design, reliable safety performance, and low noise. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a single-unit two-stage compressor with a screw and a piston connected in series, which has a reasonable structural design, reliable safety performance and low noise.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problems is: the single-machine two-stage compressor with a screw and a piston in series includes a motor body, a terminal block and a rotor body, the motor body is provided with a motor stator and a motor rotor that cooperate with each other, the motor body is provided with an air inlet, and the terminal block is installed on the motor body; one end of the rotor body is connected to one end of the motor body by a flange, and a male rotor and a female rotor that mesh with each other are provided in the rotor body, and the front end of the male rotor is fixed to the motor rotor in the motor body; its structural characteristics are: it also includes a connecting body, a connecting pipe and a cylinder body, one end of the connecting body is connected to the other end of the rotor body by a flange, the other end of the connecting body is provided with a sealing plate for sealing, the connecting body is provided with an air supply port, the interior of the connecting body is installed with an exhaust end body, the rear of the male rotor and the rear of the female rotor are both installed on the exhaust end body; the inner wall of the sealing plate of the connecting body is fixed with a worm gear The worm housing is provided with a worm gear and a worm gear that cooperate with each other, and one end of the worm gear is provided with a driven bevel gear, and the rear end of the male rotor is provided with an active bevel gear, which meshes with the driven bevel gear; the cylinder body is fixed to the outer wall of the sealing plate of the connecting body, and a crankshaft is installed in the cylinder body, one end of the crankshaft extends into the connecting body and is coaxially fixed with the worm gear, and several piston chambers are provided in the cylinder body, and the top of each piston chamber is provided with a piston intake port and a piston exhaust port, and the piston intake port and the piston exhaust port are respectively provided with an intake valve plate and an exhaust valve plate, and a piston is installed in each piston chamber, and each piston is connected to the crankshaft through a connecting rod; one end of the connecting pipe is connected to the sealing plate of the connecting body, and the connecting pipe is connected to the interior of the connecting body, the other end of the connecting pipe is connected to one end of the cylinder body, and the connecting pipe is connected to the interior of the cylinder body, and the other end of the cylinder body is provided with an outlet.

[0007] Preferably, the connecting body of the present invention is a gradually expanding cylindrical structure.

[0008] Preferably, the rear portion of the male rotor and the rear portion of the female rotor of the present invention are both mounted on the exhaust end body via bearings.

[0009] Preferably, the air intake valve plate of the present invention is located on the side of the piston air intake port close to the piston.

[0010] Preferably, the exhaust valve plate of the present invention is located on the side of the piston exhaust port away from the piston.

[0011] Preferably, the motor body of the present invention has a cylindrical structure.

[0012] Preferably, the rotor body of the present invention has a cylindrical structure.

[0013] Preferably, the piston air intake port of the present invention is a cylindrical through-hole structure, and the piston exhaust port is a cylindrical through-hole structure.

[0014] Preferably, the number of piston chambers in the cylinder body of the present invention is 2 to 12.

[0015] Preferably, the cylinder body of the present invention has a rectangular parallelepiped structure.

[0016] A compression method for a single-unit two-stage compressor in which a screw and a piston are connected in series, wherein the compression method comprises the following steps:

[0017] a. When the power supply is connected to the terminal block, the motor rotor starts to rotate, driving the male rotor to rotate. The female rotor meshes with the male rotor, and the male rotor drives the female rotor to rotate.

[0018] b. As the male rotor rotates, the driving bevel gear on the male rotor rotates along with the male rotor. The driving bevel gear meshes with the driven bevel gear, and the driving bevel gear drives the driven bevel gear to rotate.

[0019] c. The worm and the driven bevel gear rotate synchronously. The worm drives the worm wheel, which drives the crankshaft. The crankshaft drives the connecting rod to perform periodic motion, which in turn drives the piston to perform reciprocating motion.

[0020] d. The working fluid to be compressed enters the compressor from the air inlet, passes through the interior of the motor body, and reaches the air intake of the male and female rotors in the rotor body. As the male and female rotors rotate, the working fluid is continuously compressed and moves toward the exhaust end body. The compressed working fluid is discharged from the exhaust end body and then reaches the interior of the connecting body;

[0021] e. While the working fluid flows inside the connecting body, it exchanges heat with the outside world, lowering the temperature of the internal working fluid. Furthermore, low-temperature gas is added to the gas inlet, where it mixes with the working fluid inside the connecting body, lowering the temperature of the working fluid inside the connecting body. This achieves interstage cooling, significantly reducing the working fluid temperature.

[0022] f. The working fluid inside the connecting body enters the cylinder body through the connecting pipe. The connecting pipe is exposed to the outside. After the working fluid flows through the connecting pipe, it also achieves a cooling effect. When the external temperature is low, the cooling effect here is better.

[0023] g. After the cooled working fluid enters the cylinder body, the piston reciprocates under the action of the crankshaft. When the piston is moving away from the piston intake port, the intake valve plate opens and the exhaust valve plate closes, allowing the working fluid to enter the piston cavity through the piston intake port. When the piston is moving toward the piston intake port, the intake valve plate closes and the exhaust valve plate opens, allowing the working fluid in the piston cavity to be discharged through the piston exhaust port, thereby leaving the piston cavity.

[0024] h. The working fluid leaving the piston chamber is eventually discharged through the outlet and leaves the compressor, thus completing the compression of the working fluid.

[0025] Compared with the prior art, the present invention has the following advantages and effects:

[0026] (1) Compared with the existing twin-screw two-stage compressor, the advantages of this utility model are as follows:

[0027] ① Better compression efficiency and refrigeration capacity

[0028] On the one hand, the screw-and-piston two-stage compressor uses two-stage continuous compression and intercooling technology. The high-temperature gas after the first stage of compression is cooled by the intercooler before entering the second stage of compression. This can significantly reduce the temperature of the gas and improve the efficiency of the next stage of compression. This design makes the gas compression process closer to isothermal compression and reduces power consumption. Therefore, it can show higher compression efficiency and refrigeration capacity under conditions requiring large cooling output or low temperature operation.

[0029] On the other hand, the high-pressure stage adopts piston compression, which is essentially a contact seal, is easier to implement, and has less internal leakage and higher performance than the screw compression form.

[0030] ② Wider scope of application

[0031] On the one hand, the gas is cooled by an intercooler between the two stages of compression, which can significantly reduce the temperature of the gas. This design makes the gas closer to isothermal compression during the compression process, reduces power consumption, and helps to achieve a lower evaporation temperature.

[0032] On the other hand, the piston compression method as the second-stage compression can adapt to situations where the difference between the suction and exhaust pressures is large, such as continuing to compress the gas under low temperature and low pressure or high temperature and high pressure conditions, thereby meeting the requirements of lower evaporation temperature or higher condensation temperature. Therefore, in applications where a large difference between the suction and exhaust pressures is required, the screw plus piston two-stage compressor can ensure stable operation of the system while meeting this requirement, thus having a wider range of applications.

[0033] (2) Compared with the existing screw plus piston single-unit two-stage compressor, the advantages of this utility model are as follows:

[0034] ① Higher reliability

[0035] In existing single-unit two-stage compressors with a screw and piston connected in series, the screw and piston units are generally connected by a reduction gear. The piston unit has low-frequency pulsation, which, when transmitted to the screw, can easily affect the rotation of the screw unit, adversely affecting the unit. The present utility model incorporates a worm gear and worm gear with a built-in speed reducer function. The piston and crankshaft have low-frequency pulsation, and the worm gear and worm gear have a self-locking function, meaning the worm gear cannot drive the worm gear, blocking the transmission of low-frequency pulsation. Therefore, the self-locking function of the worm gear and worm gear achieves "one-way transmission," eliminating the possibility of piston and crankshaft pulsation affecting the screw unit in reverse, resulting in higher reliability.

[0036] ② Smooth transmission and low noise

[0037] On the one hand, the kinematic pair of the worm gear transmission is a helical pair, so the transmission is smooth and less prone to vibration and noise. This stable transmission method allows the worm gear connection to maintain a low noise level even at high speeds, improving the overall performance of the equipment.

[0038] On the other hand, the transmission ratio of the worm gear transmission can be between 8-100. Compared with the gear transmission, its transmission ratio is larger and can achieve a larger reduction ratio, which means that the speed of the crankshaft of the piston part can be further reduced, which helps to reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments and / or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 It is a schematic diagram of the three-dimensional structure of a single-unit two-stage compressor in which a screw and a piston are connected in series in an embodiment of the present utility model.

[0041] Figure 2 It is a three-dimensional structural schematic diagram from another perspective of a single-unit two-stage compressor in which a screw and a piston are connected in series in an embodiment of the present invention.

[0042] Figure 3 This is a three-dimensional structural diagram from another perspective of a single-unit two-stage compressor in which the screw and the piston are connected in series in an embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram of the main structure of a single-unit two-stage compressor in which the screw and the piston are connected in series in an embodiment of the present invention.

[0044] Figure 5 It is a bottom view structural schematic diagram of a single-unit two-stage compressor in which a screw and a piston are connected in series in an embodiment of the utility model.

[0045] Figure 6 yes Figure 4 The cross-sectional structure diagram of the AA plane is shown in the figure, and the direction of working medium flow is indicated in the figure.

[0046] Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure of the middle BB surface.

[0047] Figure 8 yes Figure 5 Schematic diagram of the enlarged cross-sectional structure of the middle CC surface.

[0048] Figure 9 yes Figure 4 Schematic diagram of the enlarged cross-sectional structure of the middle DD surface.

[0049] Figure 10 yes Figure 5 The cross-sectional enlarged structural diagram of the middle EE surface is shown, and the direction of working medium flow is indicated in the figure.

[0050] Figure 11 yes Figure 5 Schematic diagram of the enlarged cross-sectional structure of the middle FF surface.

[0051] In the figure: 1-air inlet; 2-motor body; 3-terminal block; 4-rotor body; 5-connecting body; 6-connecting pipe; 7-cylinder body; 8-air supply port; 9-air outlet; 10-motor stator; 11-motor rotor; 12-male rotor; 13-female rotor; 14-exhaust end body; 15-driving bevel gear; 16-driven bevel gear; 17-worm; 18-worm wheel; 19-worm gear housing; 20-crankshaft; 21-connecting rod; 22-piston; 23-piston intake port; 24-piston exhaust port; 25-intake valve plate; 26-exhaust valve plate; 27-piston chamber; 28-sealing plate. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0053] Example

[0054] See also Figures 1 to 11 The single-unit two-stage compressor with the screw and piston connected in series in this embodiment includes a motor body 2, a terminal block 3, a rotor body 4, a connecting body 5, a connecting pipe 6 and a cylinder body 7.

[0055] In this embodiment, a motor body 2 is provided with a motor stator 10 and a motor rotor 11 that cooperate with each other. The motor body 2 is provided with an air inlet 1, and a terminal block 3 is mounted on the motor body 2. When the terminal block 3 is energized, the motor stator 10 causes the motor rotor 11 to rotate.

[0056] One end of the rotor body 4 in this embodiment is connected to one end of the motor body 2 through a flange. A male rotor 12 and a female rotor 13 that mesh with each other are provided in the rotor body 4. The front end of the male rotor 12 is fixed to the motor rotor 11 in the motor body 2. After the motor rotor 11 rotates, it can drive the male rotor 12 to rotate, and the male rotor 12 drives the female rotor 13 to rotate, thereby realizing the function of the male rotor 12 and the female rotor 13 to compress the working medium.

[0057] In this embodiment, one end of the connecting body 5 is connected to the other end of the rotor body 4 via a flange. The other end of the connecting body 5 is provided with a sealing plate 28 for sealing. The connecting body 5 is provided with an air supply port 8, and the working medium can enter the compressor from the air supply port 8. An exhaust end body 14 is installed inside the connecting body 5, and the rear part of the male rotor 12 and the rear part of the female rotor 13 are both installed on the exhaust end body 14, that is, the rear part of the male rotor 12 is rotatably installed on one exhaust end body 14, and the rear part of the female rotor 13 is rotatably installed on the other exhaust end body 14. The working medium in the rotor body 4 can enter the connecting body 5 through the exhaust end body 14. Normally, the rear part of the male rotor 12 and the rear part of the female rotor 13 are both installed on the exhaust end body 14 through bearings.

[0058] In this embodiment, a worm gear housing 19 is fixed to the inner wall of the sealing plate 28 of the connecting body 5. Within this housing 19 are positioned a worm gear 18 and a worm 17, which cooperate with each other. A driven bevel gear 16 is positioned at one end of the worm 17, and a driving bevel gear 15 is positioned at the rear end of the male rotor 12. This driving bevel gear 15 meshes with the driven bevel gear 16. Rotation of the male rotor 12 drives the driving bevel gear 15, which in turn drives the driven bevel gear 16. This, in turn, drives the worm 17, which in turn, in turn, drives the worm gear 17. The rotation of the worm 17, in turn, drives the worm gear 18.

[0059] In this embodiment, the cylinder body 7 is fixed to the outer wall of the sealing plate 28 of the connecting body 5. A crankshaft 20 is installed in the cylinder body 7. One end of the crankshaft 20 extends into the connecting body 5 and is coaxially fixed with the worm gear 18. The rotation of the worm gear 18 drives the crankshaft 20 to rotate. Four piston chambers 27 are provided in the cylinder body 7. The number of piston chambers 27 can be determined according to actual conditions. Typically, the number of piston chambers 27 in the cylinder body 7 ranges from 2 to 12. Each piston chamber 27 is provided at the top with a piston intake port 23 and a piston exhaust port 24. The piston intake port 23 is provided with an intake valve plate 25, located on the side of the piston intake port 23 closest to the piston 22. The intake valve plate 25 can be opened and closed in response to changes in the force of the working medium. The piston exhaust port 24 is provided with an exhaust valve plate 26, located on the side of the piston exhaust port 24 away from the piston 22. The exhaust valve plate 26 can be opened and closed in response to changes in the force of the gas. A piston 22 is installed in each piston chamber 27, and each piston 22 is connected to the crankshaft 20 through a connecting rod 21, that is, one end of the connecting rod 21 is connected to the piston 22, and the other end of the connecting rod 21 is connected to the crankshaft 20. Through the rotation of the crankshaft 20, under the action of the connecting rod 21, the piston 22 can make reciprocating motion in the piston chamber 27.

[0060] In this embodiment, one end of the connecting pipe 6 is connected to the sealing plate 28 of the connecting body 5, and the connecting pipe 6 and the interior of the connecting body 5 are in communication. The other end of the connecting pipe 6 is connected to one end of the cylinder body 7, and the connecting pipe 6 and the interior of the cylinder body 7 are in communication. The working medium inside the connecting body 5 can enter the cylinder body 7 through the connecting pipe 6. An outlet 9 is provided at the other end of the cylinder body 7, and the compressed working medium is discharged from the compressor through the outlet 9.

[0061] In this embodiment, the connecting body 5 has a gradually expanding cylindrical structure, that is, it gradually expands along the direction of the working medium flow. The motor body 2 has a cylindrical outer structure, and the rotor body 4 also has a cylindrical outer structure. The piston intake port 23 is a cylindrical through-hole structure, and the piston exhaust port 24 is also a cylindrical through-hole structure. The cylinder body 7 has a rectangular parallelepiped outer structure.

[0062] The steps of the compression method of a single-unit two-stage compressor with a screw and a piston in series in this embodiment are as follows:

[0063] a terminal block 3 is powered on, the motor rotor 11 begins to rotate, and drives the male rotor 12 to rotate, the female rotor 13 engages with the male rotor 12, the male rotor 12 drives the female rotor 13 to rotate;

[0064] b. Under the rotation of the positive rotor 12, the driving bevel gear 15 on the positive rotor 12 rotates with the positive rotor 12, the driving bevel gear 15 and the driven bevel gear 16 mesh, and the driving bevel gear 15 drives the driven bevel gear 16 to rotate;

[0065] c. The worm 17 rotates synchronously with the driven bevel gear 16, the worm 17 drives the worm gear 18 to rotate, the worm gear 18 drives the crankshaft 20 to rotate, the crankshaft 20 drives the connecting rod 21 to perform cyclic motion, and the connecting rod 21 drives the piston 22 to reciprocate;

[0066] d. The working fluid to be compressed enters the compressor from the air inlet 1, passes through the interior of the motor body 2, and reaches the air intake of the male and female rotors in the rotor body 4. As the male rotor 12 and the female rotor 13 rotate, the working fluid is continuously compressed and moves toward the exhaust end body 14. The compressed working fluid is discharged from the exhaust port of the exhaust end body 14 and then reaches the interior of the connecting body 5;

[0067] e. While the working fluid flows within the connecting body 5, the connecting body 5 exchanges heat with the outside world, thereby lowering the temperature of the internal working fluid. Furthermore, low-temperature gas is introduced into the gas supply port 8, where it mixes with the working fluid within the connecting body 5, lowering the temperature of the working fluid within the connecting body 5. This achieves an interstage cooling effect, significantly lowering the working fluid temperature. This significant cooling of the working fluid is primarily achieved by introducing low-temperature gas into the gas supply port 8. The low-temperature gas introduced into the gas supply port 8 is typically low-temperature fluorine. Of course, heat exchange between the connecting body 5 and the outside world also achieves the effect of lowering the temperature of the working fluid within the connecting body 5.

[0068] f. The working fluid located inside the connecting body 5 enters the cylinder body 7 through the connecting pipe 6. The connecting pipe 6 is exposed to the outside. After the working fluid flows through the connecting pipe 6, the cooling effect is achieved. When the outside temperature is low, the cooling effect is better here.

[0069] g. After the cooled working fluid enters the cylinder body 7, the piston 22 reciprocates under the action of the crankshaft 20. When the piston 22 is moving away from the piston intake port 23, the intake valve plate 25 opens and the exhaust valve plate 26 closes, allowing the working fluid to enter the piston chamber 27 from the piston intake port 23. When the piston 22 is moving closer to the piston intake port 23, the intake valve plate 25 closes and the exhaust valve plate 26 opens, allowing the working fluid in the piston chamber 27 to be discharged from the piston exhaust port 24, thereby leaving the piston chamber 27.

[0070] h. The working fluid leaving the piston chamber 27 is eventually discharged through the gas outlet 9 and leaves the compressor, thereby completing the compression of the working fluid.

[0071] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is merely an example of the structure of the utility model. Any equivalent changes or simple changes made based on the structure, features and principles described in the concept of the utility model patent are included in the scope of protection of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should fall within the scope of protection of the utility model.

Claims

1. A single-unit two-stage compressor with a screw and a piston connected in series, comprising a motor body (2), a terminal block (3) and a rotor body (4), wherein a motor stator (10) and a motor rotor (11) that cooperate with each other are provided in the motor body (2), an air inlet (1) is provided on the motor body (2), and the terminal block (3) is mounted on the motor body (2); one end of the rotor body (4) is connected to one end of the motor body (2), and a male rotor (12) and a female rotor (13) that mesh with each other are provided in the rotor body (4), and the front end of the male rotor (12) is fixed to the motor rotor (11) in the motor body (2); and characterized in that: It also includes a connecting body (5), a connecting pipe (6) and a cylinder body (7), one end of the connecting body (5) is connected to the other end of the rotor body (4), the other end of the connecting body (5) is provided with a sealing plate (28) for sealing, the connecting body (5) is provided with an air supply port (8), an exhaust end body (14) is installed inside the connecting body (5), and the rear part of the male rotor (12) and the rear part of the female rotor (13) are both installed on the exhaust end body (14); the connecting body (5) is provided with a connecting pipe (6) and a connecting pipe (7), wherein ... A worm gear housing (19) is fixed to the inner wall of the sealing plate (28) of the body (5), wherein the worm gear housing (19) is provided with a worm gear (18) and a worm (17) that cooperate with each other, and a driven bevel gear (16) is provided at one end of the worm (17), and a driving bevel gear (15) is provided at the rear end of the male rotor (12), and the driving bevel gear (15) and the driven bevel gear (16) are meshed; the cylinder body (7) is fixed to the outer wall of the sealing plate (28) connected to the body (5). A crankshaft (20) is installed in the cylinder body (7), one end of the crankshaft (20) extends into the connecting body (5) and is coaxially fixed with the worm gear (18), and a plurality of piston chambers (27) are provided in the cylinder body (7), and a piston air intake port (23) and a piston air exhaust port (24) are provided at the top of each piston chamber (27), and an air intake valve plate (25) and an air exhaust valve plate (26) are provided on the piston air intake port (23) and the piston air exhaust port (24), respectively. A piston (22) is installed in each cavity (27), and each piston (22) is connected to the crankshaft (20) through a connecting rod (21); one end of the connecting pipe (6) is connected to the sealing plate (28) of the connecting body (5), and the connecting pipe (6) and the interior of the connecting body (5) are communicated; the other end of the connecting pipe (6) is connected to one end of the cylinder body (7), and the connecting pipe (6) and the interior of the cylinder body (7) are communicated; the other end of the cylinder body (7) is provided with an air outlet (9).

2. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The connecting body (5) is a gradually expanding cylindrical structure.

3. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The rear portion of the male rotor (12) and the rear portion of the female rotor (13) are both mounted on the exhaust end body (14) via bearings.

4. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The air intake valve plate (25) is located on a side of the piston air intake port (23) close to the piston (22).

5. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The exhaust valve plate (26) is located on a side of the piston exhaust port (24) away from the piston (22).

6. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The motor body (2) has a cylindrical outer shape.

7. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The rotor body (4) has a cylindrical structure.

8. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The piston air intake port (23) is a cylindrical through-hole structure, and the piston air exhaust port (24) is a cylindrical through-hole structure.

9. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The number of piston chambers (27) in the cylinder body (7) is 2 to 12.

10. The single-unit two-stage compressor with a screw and a piston connected in series according to claim 1, characterized in that: The cylinder body (7) has a rectangular parallelepiped structure.

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