Compressor without impeller pump

Abstract

The invention relates to a compressor without an impeller pump. The compressor without the impeller pump comprises a cylinder body, a separating mechanism is arranged on one side of the cylinder body, and a piston cavity is connected between the cylinder body and the separating mechanism; the compressor main shaft penetrates through the top of the cylinder body and is in transmission connection with the motor main shaft, the output end of the compressor main shaft is connected with a piston, and the piston is arranged in the piston cavity; the oil return pipeline is provided with a first end and a second end which are oppositely arranged, the first end of the oil return pipeline is communicated with the separation mechanism, and the second end of the oil return pipeline is communicated with the cylinder body; and the flow controller is arranged between the first end and the second end of the oil return pipeline. Oil in the separation mechanism can be guided into the oil return pipeline by means of pressure difference, and stable oil return is achieved by means of the flow controller.

Description

Technical Field

[0001] The present invention relates to a vehicle-mounted compressor, in particular to an impeller-less pump compressor. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and may not constitute prior art.

[0003] With the increasing variety of new energy vehicles, some models of new energy vehicles are equipped with on-board refrigerators, which use motors to drive the compressor and keep the refrigerator running.

[0004] Existing car refrigerator compressors typically require oil for lubricating pistons and other devices. However, this oil inevitably mixes with the refrigerant, necessitating an oil return system to separate the oil from the refrigerant and redirect it to the piston for lubrication. The prior art typically accumulates the separated oil in an oil chamber at the bottom of the compressor, and an impeller pump located at the top of the compressor lifts the oil from the chamber and redirects it back into the cylinder. However, due to the impeller pump mechanism located at the top, the compressor motor cannot be located at the top of the compressor, making it difficult to meet diverse layout requirements. Furthermore, the impeller pump mechanism is expensive, easily damaged, and difficult to maintain in a closed structure.

[0005] It should be noted that the above technical background is merely provided to provide a clear and complete description of the technical solutions of the present invention and to facilitate understanding by those skilled in the art. Simply because these solutions are described in the technical background section of the present invention, it should not be assumed that the above technical solutions are well known to those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a compressor without an impeller pump, which can guide the oil in the separation mechanism into the oil return pipeline by means of a pressure difference and achieve stable oil return by means of a flow controller.

[0007] In order to achieve the above-mentioned object, the present invention discloses the following impellerless pump compressor, which is installed at the bottom of a motor, wherein the motor includes a motor main shaft, and the impellerless pump compressor includes:

[0008] A cylinder body, a separation mechanism is provided on one side of the cylinder body, and a piston chamber is connected between the cylinder body and the separation mechanism;

[0009] A compressor main shaft, the compressor main shaft passing through the top of the cylinder body and being drivingly connected to the motor main shaft, the output end of the compressor main shaft being connected to a piston, the piston being disposed in the piston cavity;

[0010] an oil return line, the oil return line having a first end and a second end oppositely disposed, the first end of the oil return line being connected to the separation mechanism, and the second end of the oil return line being connected to the cylinder body;

[0011] A flow controller is provided between the first end and the second end of the oil return pipeline.

[0012] As a further description of the above technical solution, the flow controller is configured as a throttle tube, and the throttle tube is provided with a high-pressure side and a low-pressure side. The high-pressure side of the throttle tube is provided on the side facing the separation mechanism, and the low-pressure side of the throttle tube is provided on the side facing the cylinder body.

[0013] As a further description of the above technical solution, the first end of the oil return pipeline is arranged at the bottom position of the separation mechanism.

[0014] As a further description of the above technical solution, the second end of the oil return pipeline is arranged on the side wall of the cylinder body.

[0015] As a further description of the above technical solution, the oil return pipeline includes a first section, a second section, a third section and a fourth section which are connected in sequence. The first section extends obliquely downward from the bottom of the separation mechanism, the second section is arranged at the bottom of the cylinder body, the third section extends in a direction perpendicular to the cylinder body, and the fourth section extends obliquely downward and is connected to the side wall of the cylinder body.

[0016] As a further description of the above technical solution, the flow controller is arranged at the fourth section of the oil return pipeline.

[0017] As a further description of the above technical solution, the piston cavity extends in a horizontal direction, and the middle position of the separation mechanism is connected to the piston cavity.

[0018] As a further description of the above technical solution, the compressor main shaft is vertically inserted into the cylinder body from the top of the cylinder body.

[0019] As a further description of the above technical solution, the side of the compressor main shaft facing away from the cylinder body is connected to the motor main shaft.

[0020] As a further description of the above technical solution, a shaft seal is installed between the compressor main shaft and the motor main shaft.

[0021] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0022] The impeller-less pump compressor of the present invention can guide the oil in the separation mechanism into the return oil pipeline with the help of pressure difference, and realize stable oil return with the help of a flow controller. Specifically, the separation mechanism is set at the end of the piston working position, which has a higher pressure. Therefore, the oil can be guided into the return oil pipeline at the end of the separation mechanism with the help of a pressure difference, and the oil pressure can be regulated with the help of a flow controller in the return oil pipeline, so that the oil can be stably and continuously transported back to the cylinder body, and the piston and other mechanisms can be continuously lubricated. At the same time, since the present invention does not adopt an impeller pump mechanism, the compressor main shaft can be set at the top position of the cylinder body, and the motor can be installed on the top outside of the cylinder body, realizing flexible and diverse layout forms.

[0023] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1-2 It is a partial cross-sectional schematic diagram of an impellerless pump compressor provided in an embodiment of this specification;

[0026] Figure 3 It is a three-dimensional schematic diagram of an impellerless pump compressor provided in an embodiment of this specification;

[0027] Figure 4 1 is a cross-sectional schematic diagram of an impellerless pump compressor provided in an embodiment of this specification;

[0028] Figure 5 This is a schematic diagram of a separation mechanism of an impellerless pump compressor provided in an embodiment of this specification;

[0029] Figure 6 This is an exploded schematic diagram of a multifunctional compression system provided in an embodiment of this specification;

[0030] In the picture:

[0031] 1. Refrigerator compressor; 11. Compressor main shaft; 12. Cylinder block; 13. Piston; 14. Separation mechanism; 15. Piston chamber; 16. Oil return line; 161. First section; 162. Second section; 163. Third section; 164. Fourth section; 165. Flow controller;

[0032] 2. Air compressor; 21. Air compressor main shaft;

[0033] 3. Motor; 31. Motor main shaft; 32. Motor base; 33. Air compressor bearing; 34. Bearing limit corrugated plate; 35. Shaft seal retaining ring; 36. Shaft seal; 37. Thrust bearing; 38. Overrunning clutch; 39. Counterweight; 310. Deep groove ball bearing; 311. Sleeve. DETAILED DESCRIPTION

[0034] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this specification without creative effort shall fall within the scope of protection of this specification.

[0035] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0036] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term "or" as used herein may include any one or more combinations of the associated listed items, as appropriate.

[0037] See Figure 1-5 , is an impellerless pump compressor of this embodiment, which is installed at the bottom position of the motor 3. The motor 3 includes a motor main shaft 31, wherein the impellerless pump compressor includes:

[0038] A cylinder body 12, a separation mechanism 14 is provided on one side of the cylinder body 12, and a piston chamber 15 is connected between the cylinder body 12 and the separation mechanism 14;

[0039] The compressor main shaft 11 passes through the top of the cylinder 12 and is in driving connection with the motor main shaft 31. The output end of the compressor main shaft 11 is connected to the piston 13, which is disposed in the piston chamber 15.

[0040] An oil return line 16 having a first end and a second end opposite to each other, the first end of the oil return line 16 being connected to the separation mechanism 14 , and the second end of the oil return line 16 being connected to the cylinder body 12 ;

[0041] The flow controller 165 is disposed between the first end and the second end of the oil return line 16 .

[0042] Based on the above structure, during use, please refer to Figure 3 The motor 3 is mounted on one side of the top of the cylinder 12. When the motor 3 is running, it drives the motor shaft 31 to rotate. The motor shaft 31 drives the compressor shaft 11 to rotate, causing the piston 13 at its end to reciprocate in the piston chamber 15, continuously compressing the refrigerant in the piston chamber 15. At the same time, the oil mixed with the compressed refrigerant is pushed into the separation mechanism 14 at the end of the piston 13. Since the refrigerant is in gaseous form, it is absorbed and discharged by the corresponding mechanism, while the oil is in a liquid state with a higher density. After being sprayed onto the wall of the separation mechanism 14, it slides down and gathers under the action of gravity.

[0043] It is worth noting that because the separator 14 contains compressed refrigerant, the pressure in the separator 14 increases, creating a pressure differential with the external oil return line 16. This pressure differential causes the accumulated oil to be pressed into the oil return line 16. The high-pressure oil in the oil return line 16 accumulates and flows downstream of the oil return line 16. After reaching the flow controller 165 in the oil return line 16, the pressure is reduced. As a result, the oil is evenly sprayed back into the cylinder 12 at a more stable pressure, participating in the subsequent lubrication of the piston 13.

[0044] In the above-described embodiment, the oil in the separator 14 can be directed into the oil return line 16 by utilizing a pressure differential, and a flow controller can be used to achieve stable oil return. Specifically, because the separator 14 is located at the end of the piston 15 at the working position, which has a higher pressure, the oil can be directed into the oil return line 16 at the end of the separator by utilizing a pressure differential. The oil pressure can then be regulated by a flow controller 165 in the oil return line 16, thereby achieving stable and continuous oil return to the cylinder 12, thereby continuously lubricating the piston 13 and other components.

[0045] At the same time, since the present invention does not use an impeller pump mechanism, the compressor main shaft 11 can be set at the top position of the cylinder body 12, and the motor 3 can be installed on the top outside of the cylinder body 12, realizing flexible and diverse layout forms.

[0046] The following description will be made by taking an embodiment in which one of the motors 3 is installed on the top as an example.

[0047] See Figure 3 、 4 Between the first end of the motor main shaft 31 and the compressor main shaft 11, an air compressor bearing 33, a bearing stop corrugated plate 34, a shaft seal retaining ring 35, a shaft seal 36, and a thrust bearing 37 are sequentially sleeved along the direction from the second end to the first end, and are restrained within the cylinder 12 of the refrigerator compressor. The air compressor bearing 33 primarily serves to directly connect to the motor main shaft 31 and primarily bears radial loads perpendicular to the axis of the rotating shaft, maintaining the radial concentricity of the rotor and reducing friction to ensure smooth rotation. Similarly, the thrust bearing 37 is positioned closest to the compressor main shaft 11 and primarily serves to bear axial thrust in a direction parallel to the axis of the rotating shaft, preventing the rotor from overrunning due to the axial force generated by the pressure difference. The bearing stop corrugated plate 34 is axially elastic and is used to apply a constant axial preload, eliminate bearing clearance, suppress vibration, and increase stiffness. Through the elastic deformation of its own wave spring, it applies an initial force to both ends in the axial direction, maintaining stable contact.

[0048] In this embodiment, the refrigerator and the air compressor are actually driven by the two ends of the motor main shaft 31 of the same motor 3. Therefore, the motor 3 can and can only be installed at the top position of the cylinder body 12 in this embodiment. The shaft seal retaining ring 35 and the shaft seal 36 structure in this embodiment are the most different from the existing connection structure. Since the refrigerator compressor 1, the air compressor and the motor 3 in this embodiment may actually be connected, and the refrigerator compressor 1 side is mainly used for refrigerant processing, and the air compressor side is mainly used for air processing, and the refrigerant and the air cannot contact each other, the shaft seal retaining ring 35 and the shaft seal 36 need to be provided to effectively block the compressor 1 and the air compressor 2 from contacting each other. Specifically, the outer wall of the shaft seal 36 is in contact with the inner wall of the cylinder body 12 of the refrigerator compressor 1, so that the first end side and the second end side of the shaft seal 36 are completely isolated by the shaft seal 36.

[0049] In the prior art refrigerator compressor with an impeller pump, a closed impeller pump structure needs to be provided at the top of the cylinder 12. The impeller pump structure is generally a separate, enclosed box covering the top of the cylinder 12 for the sake of sealing and integration. Therefore, under such conditions, it is difficult to synchronously set the motor 3 at the top of the cylinder 12. In this embodiment, the return oil line 16 controls the return oil with the help of a pressure difference and a flow controller 165, avoiding the encapsulation of the impeller pump structure at the top, and realizing a structural design with spare space at the top of the cylinder 12 for the connection and sealing of the compressor main shaft 11 and the motor main shaft 31. In the above embodiment, a single motor 3 can be used to drive both the air conditioning part and the air compressor part, saving space and cost, and achieving a good sealing effect.

[0050] In this embodiment, the flow controller 165 is configured as a throttle tube having a high-pressure side and a low-pressure side. The high-pressure side of the throttle tube is disposed on the side facing the separation mechanism 14, while the low-pressure side of the throttle tube is disposed on the side facing the cylinder body 12. Therefore, high-pressure oil transmitted from one side of the separation mechanism 14 is converted into acceptable low-pressure, stable oil after being processed by the throttle tube and injected back into the cylinder body 12, achieving a stable lubrication effect.

[0051] See Figure 1 、 2 The oil return line 16 includes a first section 161, a second section 162, a third section 163, and a fourth section 164, which are connected in sequence. The first section 161 extends obliquely downward from the bottom of the separation mechanism 14, the second section 162 is located at the bottom of the cylinder 12, the third section 163 extends in a direction perpendicular to the cylinder 12, and the fourth section 164 extends obliquely downward and is connected to the side wall of the cylinder 12. For details, please refer to Figure 5 The first end of the return oil line 16 is positioned at the bottom of the separation mechanism 14. That is, the first section 161 of the return oil line 16 in this embodiment is docked with the bottom of the separation mechanism 14, better absorbing the oil accumulated by gravity and transporting it more smoothly to the second section 162 in an oblique manner. Under the action of high oil pressure, the third section 163 rapidly pulls the oil vertically to the fourth section 164. A throttle valve, serving as a flow controller 165, is positioned at the fourth section 164, which serves as the final section. This throttle valve quickly reduces the oil pressure and stably transports the oil back to the cylinder body 12 in a similarly oblique downward manner. This structural layout does not occupy an excessive amount of space in the cylinder body 12 and maintains stable and rapid oil transportation. It is worth noting that, to meet structural avoidance requirements, the multiple sections of the return oil line 16 can be supplemented with other sections of different directions and lengths as needed.

[0052] It is worth noting that, see Figure 1In this embodiment, the fourth section 164 for installing the throttle is directly connected to the outside and is sealed by a bolt, so that the throttle can be maintained and installed more conveniently.

[0053] Of course, in some other embodiments, the oil return line 16 may be arranged in other ways according to the shape of the cylinder body 12, as long as it can maintain smooth flow.

[0054] See Figure 4 In this embodiment, the compressor main shaft 11 is vertically inserted into the cylinder body 12 from the top of the cylinder body 12. Therefore, the motor 3 is directly and stably installed in contact with the top center position of the cylinder body 12, which has good connection strength and can keep the operating center of gravity of the compressor main shaft 11 stable.

[0055] In this embodiment, the end of the compressor main shaft 11 is vertically connected to the piston 13, and the rotation of the compressor main shaft 11 drives the piston 13 to move along the Figure 1 The piston moves in the left and right directions.

[0056] Please see Figure 6 , is a complete multifunctional compression system, wherein the multifunctional compression system includes:

[0057] A refrigerator compressor 1, the refrigerator compressor 1 includes a compressor main shaft 11;

[0058] Air compressor 2, air compressor 2 includes an air compressor main shaft 21;

[0059] The motor 3 includes a motor shaft 31 extending therethrough, and the motor shaft 31 has a first end and a second end opposite to each other;

[0060] The first end of the motor main shaft 31 is in driving connection with the compressor main shaft 11, so that when the motor 3 rotates forward, the first end of the motor main shaft 31 can drive the compressor main shaft 11 to rotate in a first direction, and when the motor 3 rotates reversely, the first end of the motor main shaft 31 can drive the compressor main shaft 11 to rotate in a second direction;

[0061] The second end of the motor main shaft 31 is connected to the air compressor main shaft 21 through an overrunning clutch 38 for unidirectional rotation, so that when the motor 3 rotates forward, the second end of the motor main shaft 31 can drive the air compressor main shaft 21 to rotate along the third direction. When the motor 3 rotates reversely, the second end of the motor main shaft 31 idles and the air compressor main shaft 21 is stationary.

[0062] Through the above structure, when in use, the operator can input commands through an external vehicle-mounted computer host. The vehicle-mounted computer host is used to control the operation of the motor 3, and is used to control the start and stop, forward rotation, reverse rotation, or the speed of the motor 3.

[0063] Specifically, in the default state, the motor 3 is in the reverse state. In the reverse state, the motor shaft 31 of the motor 3 rotates, and the first end of the motor shaft 31 drives the compressor shaft 11 to rotate in the second direction, which is the reverse direction in this embodiment. The compressor shaft 11 drives the piston in the refrigerator compressor 1 to move, compressing the refrigerant, so that the vehicle refrigerator remains refrigerated. At the same time, because the second end of the motor shaft 31 is connected to an overrunning clutch 38, specifically, the overrunning clutch 38 is a one-way bearing that is locked in the forward rotation and rotates freely in the reverse rotation. Therefore, during the reverse rotation, the two ends of the overrunning clutch 38 cannot achieve a rotational connection, so that the motor shaft 31 cannot drive the air compressor shaft 21 to rotate synchronously. Therefore, the air compressor shaft 21 is not controlled by the motor shaft 21. Finally, only the refrigerator compressor 1 drives the vehicle refrigerator to operate in a refrigeration manner.

[0064] In special circumstances, when the operator wishes to adjust the height of the air suspension, they input a command through the vehicle computer, instructing it to control motor 3 to rotate forward. In this forward rotation state, motor 3's motor shaft 31 rotates, and the first end of motor shaft 31 drives compressor shaft 11 to rotate in a first direction (in this embodiment, the forward direction). This causes compressor shaft 11 to move the piston in refrigerator compressor 1, compressing the refrigerant and maintaining the vehicle refrigerator's cooling. Simultaneously, overrunning clutch 38 is locked in the forward rotation state. Therefore, during forward rotation, the two ends of overrunning clutch 38 are rotationally connected, causing motor shaft 31 to drive compressor shaft 21 to rotate in a third direction (in this embodiment, the forward direction). This causes compressor shaft 21 to move the corresponding piston on the compressor side, achieving adjustment of the air suspension's firmness and height to meet the operator's needs. Meanwhile, refrigerator compressor 1 continues to drive the vehicle refrigerator in cooling operation.

[0065] Of course, the above-mentioned “forward” and “reverse” are two relative directions, which can be replaced and have no limiting meaning.

[0066] After the operator has adjusted the air suspension to its proper position, he inputs a command through the on-board computer host to control the on-board computer to reverse the motor 3. At this time, the transmission connection between the second end of the motor main shaft 31 and the dynamic air compressor main shaft 21 is eliminated, the air suspension is maintained, and the on-board air conditioner continues to run.

[0067] Among them, the overrunning clutch 38 can adopt a conventional multi-ring one-way bearing, similar to a ratchet structure. The overrunning clutch 38 can rotate freely in one direction (in the reverse direction of the motor 3 in this embodiment), and is locked in the other direction (in the forward direction of the motor 3 in this embodiment). The metal shell of the overrunning clutch 38 contains many rollers, needles or balls, and the shape of its rolling seat (hole) makes it only able to roll in one direction, while it will generate great resistance in the other direction. When resistance is generated, the two ends of the overrunning clutch 38 can be connected in rotation, so that the motor main shaft 31 drives the air compressor main shaft 21 to rotate.

[0068] Of course, in other embodiments, other types of clutches may also be used, as long as they can achieve locking of the motor main shaft 31 in the forward direction and disengagement in the reverse direction.

[0069] The refrigerator compressor also includes a cylinder 12, and the cylinder 12 is connected to the motor 3 via a motor base 32. The motor 3 in this embodiment is as shown in FIG. Figure 6 As shown, it is configured as a cone with a reduced radial dimension at the first end, and the motor base 32 is just sleeved on the cone structure. The contact surface between the motor base 32 and the motor 3 is large to achieve a better sealed connection.

[0070] In the above embodiment, the shaft seal 36 may be in the form of Figure 6 The ring shown has a groove along the axial direction and is tightly pressed against the inner wall of the cylinder body 12 at the outer periphery, effectively preventing gas and liquid from passing through it. The shaft seal retaining ring 35 is configured as an elastic or C-shaped spring retaining ring installed in the shaft groove, used to axially locate and fix the shaft seal 36 as a sealing member. The retaining ring is clamped in the groove, and when the shaft seal 36 presses against the shaft seal retaining ring 35, it is precisely fixed in place.

[0071] Please continue to see Figure 6 A counterweight 39 and a deep groove ball bearing 310 are sequentially sleeved between the second end of the motor main shaft 21 and the air compressor main shaft 11 in the direction from the first end to the second end, wherein the counterweight 39 is sleeved outside the overrunning clutch 38. The function of the counterweight 39 is mainly to match the crank structure on one side of the air compressor main shaft 21 to balance the unbalanced components of the reciprocating inertia force of the piston and the rotational inertia force of the crank to prevent excessive vibration, thereby effectively maintaining the stable rotation of the air compressor main shaft 21. In this embodiment, the overrunning clutch 38 is installed in the counterweight 39, which saves more axial space and avoids the disengagement of the overrunning clutch 38, thereby having a certain limiting effect on it. The deep groove ball bearing 310 is used to simultaneously bear large radial loads and bidirectional axial loads, forming a stable support effect between the motor main shaft 31 and the air compressor main shaft 21 structure.

[0072] The motor 3 in this embodiment has a motor shaft 31 that can synchronously output to two corresponding structures from both ends. Since the second end of the motor 1 has a sleeved overrunning clutch 38 device, it has different effects in forward and reverse rotation. In the forward rotation, it can provide a stable transmission connection to the structure at the second end, and in the reverse rotation, it disconnects the transmission connection to structures such as the air compressor main shaft 21.

[0073] At the same time, a motor base 32 is installed at the first end of the motor 3 in this embodiment, and a sleeve 311 is also provided to cover the outer wall of the motor 3. The first end of the sleeve 311 is installed with the motor 3, and the second end of the sleeve 311 is docked with the structure of the air compressor 2. A permanent magnet is attached to the inner wall of the sleeve 311, which serves as the stator of the motor 3.

[0074] In this embodiment, the compressor main shaft 11 is away from the motor main shaft 31 and is connected to the piston 13 in a transmission manner, so that no matter whether the compressor main shaft 11 rotates forward or reversely under the drive of the motor main shaft 31, the piston 13 can regularly compress the refrigerant to keep the refrigerator running continuously.

[0075] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the description and drawings of the present invention are included in the scope of the patent application of the present invention.

[0076] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0077] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and variations to the present application without departing from the spirit of the present application. It is intended that the appended embodiments include these modifications and variations without departing from the present application.

Claims

1. An impellerless pump compressor, mounted at the bottom of a motor, the motor comprising a motor shaft, characterized in that: The impellerless pump compressor comprises: A cylinder body, a separation mechanism is provided on one side of the cylinder body, and a piston chamber is connected between the cylinder body and the separation mechanism; A compressor main shaft, the compressor main shaft passing through the top of the cylinder body and being drivingly connected to the motor main shaft, the output end of the compressor main shaft being connected to a piston, the piston being disposed in the piston cavity; an oil return line, the oil return line having a first end and a second end oppositely disposed, the first end of the oil return line being connected to the separation mechanism, and the second end of the oil return line being connected to the cylinder body; A flow controller is provided between the first end and the second end of the oil return pipeline.

2. The impellerless pump compressor according to claim 1, characterized in that: The flow controller is configured as a throttle tube, which is provided with a high-pressure side and a low-pressure side. The high-pressure side of the throttle tube is provided on a side facing the separation mechanism, and the low-pressure side of the throttle tube is provided on a side facing the cylinder body.

3. The impellerless pump compressor according to claim 1, characterized in that: The first end of the oil return pipeline is arranged at the bottom position of the separation mechanism.

4. The impellerless pump compressor according to claim 1, characterized in that: The second end of the oil return pipeline is arranged on the side wall of the cylinder body.

5. The impellerless pump compressor according to claim 1, characterized in that: The oil return pipeline includes a first section, a second section, a third section and a fourth section that are connected in sequence. The first section extends obliquely downward from the bottom of the separation mechanism, the second section is arranged at the bottom of the cylinder body, the third section extends in a direction perpendicular to the cylinder body, and the fourth section extends obliquely downward and is connected to the side wall of the cylinder body.

6. The impellerless pump compressor according to claim 5, characterized in that: The flow controller is arranged at the fourth section of the oil return pipeline.

7. The impellerless pump compressor according to claim 6, characterized in that: The piston cavity extends in a horizontal direction, and the middle position of the separation mechanism is communicated with the piston cavity.

8. The impellerless pump compressor according to claim 1, characterized in that: The compressor main shaft is vertically inserted into the cylinder body from the top of the cylinder body.

9. The impellerless pump compressor according to claim 8, characterized in that: The side of the compressor main shaft facing away from the cylinder body is connected to the motor main shaft.

10. The impellerless pump compressor according to claim 1, characterized in that: A shaft seal is installed between the compressor main shaft and the motor main shaft.

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