A screw compressor with forward and reverse compression and expansion

Abstract

The present invention discloses a screw compressor with forward and reverse compression and expansion, including a body, an injection assembly, a limit block and a symmetrically arranged positioning block. The injection assembly is provided with a mounting part, a pressure member, a limit member and a sealing member, the pressure member is provided with an annular groove, the pressure member is provided with a locking member matched with the annular groove, and the locking member is mounted on the pressure member through the positioning block and the limit block. The screw compressor with forward and reverse compression and expansion can realize automatic sealing of the oil filling port through the injection assembly, thereby preventing the leakage of the engine oil and the entry of external impurities into the interior, thereby affecting the operation of the internal gears. In addition, the locking member cooperates with the limit of the limit block and the positioning block to achieve the position of the pressure member in the injection assembly to keep stationary, enhance stability, and at the same time prevent the screw compressor that is vibrating during operation from shaking the pressure member and the mounting member loose, resulting in leakage of the machine head.

Description

Technical Field

[0001] The invention relates to screw compressor technology, and in particular to a screw compressor with forward and reverse compression and expansion functions. Background Art

[0002] A screw compressor is a machine widely used in industry to compress gases, especially air.

[0003] Screw compressors use a pair of intermeshing screws (commonly called rotors) to compress gas. The two screws rotate in the compressor housing to form a sealed chamber. As the screws rotate, the volume of the chamber gradually decreases, thereby compressing the gas. Its equipment has the advantages of high efficiency, reliability, strong adaptability, low vibration and low noise, making screw compressors widely used in industrial production, aerodynamic equipment, refrigeration and air-conditioning systems, petrochemicals, food processing, pharmaceutical manufacturing and other fields. With the development of technology, the design and manufacturing technology of screw compressors have been continuously improved, including new screw design, material science, intelligent control systems, energy recovery technology, etc. Modern screw compressor design focuses on energy saving and environmental protection, and reduces the impact on the environment by improving efficiency, reducing energy consumption, and using environmentally friendly refrigerants. With the development of industrial automation and intelligent manufacturing, the design and manufacturing of screw compressors tend to be more intelligent and integrated. However, the existing screw compressor equipment has a single function and is limited to gas compression, and does not have strong market competitiveness in the field of energy storage.

[0004] Screw compressors are divided into single screw compressors and twin screw compressors. Screw (i.e. twin screw) refrigeration compressors have a pair of rotors with helical teeth that mesh with each other and in opposite directions. One end of the rotor is connected by gear meshing. Lubricating oil is required between the gears to achieve cooling effect. However, since the compressor will vibrate when working, the existing oil filling port is sealed with bolts, which will not only loosen the compressor when working, causing lubricating oil leakage, but also allow external impurities to enter the interior, affecting the meshing operation of the gears, thus causing the compressor to not work properly. Summary of the invention

[0005] In order to solve the defects of the above-mentioned prior art, the present invention proposes a screw compressor with forward and reverse compression and expansion.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A screw compressor with forward and reverse compression and expansion, comprising:

[0008] The machine body is provided with a partition and a cooling shell, and the cooling shell and the partition are mounted on the machine body by bolts.

[0009] An injection assembly is arranged on a cooling shell, the cooling shell is provided with a mounting hole, the injection assembly is arranged in the mounting hole, the injection assembly is provided with a mounting piece, a pressure piece, a limit piece and a sealing piece, the lower end of the mounting piece is provided with a first threaded portion, the interior of the mounting hole is provided with a first threaded hole matched with the first threaded portion, the limit piece cooperates with the pressure piece to arrange the sealing piece in the middle of the mounting piece, a spring is provided between the mounting piece and the sealing piece, the spring pushes the sealing piece to move upward to maintain a seal between the sealing piece and the mounting piece, the pressure piece is provided with a second threaded portion, and the sealing piece is provided with a second threaded hole matched with the second threaded portion,

[0010] A limit block and a symmetrically arranged positioning block are arranged on the cooling shell, an annular groove is arranged on the pressure piece, a locking piece matching the annular groove is arranged on the pressure piece, and the locking piece is installed on the pressure piece through the positioning block and the limit block.

[0011] In the present invention, an annular support is provided on the outer wall of the mounting member, the annular support is used to support the spring, and a first through hole is formed in the middle of the mounting member.

[0012] In the present invention, an annular protrusion and a carrier are provided on the inner wall of the first through hole.

[0013] In the present invention, the limiting member is installed in the first through hole, the lower end of the limiting member is provided with a placement body matched with the carrier, the upper end is provided with an elastic arm, and the elastic arm is provided with a first undercut portion.

[0014] In the present invention, the seal is composed of a sealing disk and a movable cylinder, a second through hole is formed in the middle of the seal, a sealing portion is provided inside the movable cylinder, an accommodating hole for accommodating a limiting member is formed between the sealing portion and the inner wall of the movable cylinder, and an annular recess cooperating with the annular protrusion is provided on the outer wall of the movable cylinder.

[0015] In the present invention, a third through hole and a stepped hole are formed in the middle of the pressure member, the stepped hole is arranged at the lower end of the third through hole, the inner diameter of the stepped hole is smaller than the inner diameter of the third through hole, a stepped surface is formed between the third through hole and the stepped hole, and the first undercut portion is placed on the stepped surface between the stepped hole and the third through hole.

[0016] In the present invention, a first active area is formed between the limiting member and the pressure member, and a second active area is formed between the sealing member and the limiting member.

[0017] In the present invention, the locking member is composed of a cover plate, a fixing body is provided on the lower end surface of the cover plate, symmetrically arranged elastic arms are provided on the fixing body, a connecting arc segment is provided between the elastic arms at one end close to the fixing body, and a limiting area for accommodating the limiting block is formed at the end away from the fixing body.

[0018] In the present invention, a second undercut portion is provided on the elastic arm, the second undercut portion is in the limiting area, a guiding slope is provided on the second undercut portion, a positioning protrusion cooperating with the positioning block is provided in the middle of the elastic arm, and an annular arc segment cooperating with the annular groove is provided on the connecting arc segment.

[0019] In the present invention, an escape groove is formed between the cover plate and the elastic arm, and a sealing surface is provided in the escape groove.

[0020] The screw compressor with forward and reverse compression and expansion of the present invention has the following beneficial effects: the screw compressor with forward and reverse compression and expansion can automatically block the oil filling port through the injection assembly, thereby preventing the leakage of engine oil and the entry of external impurities into the interior, thereby affecting the operation of the internal gears. In addition, the locking member cooperates with the limit block and the positioning block to keep the pressure member in the injection assembly stationary, thereby enhancing stability, and at the same time, it can also prevent the screw compressor that is vibrating during operation from loosening the pressure member and the mounting member, thereby causing leakage of the machine head. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a screw compressor with forward and reverse compression and expansion capabilities of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the cooling shell and injection assembly structure;

[0023] Figure 3 for Figure 2 A top view of

[0024] Figure 4 for Figure 3 The cross-sectional view at AA in FIG.

[0025] Figure 5 for Figure 2 Schematic diagram of the injection component structure in;

[0026] Figure 6 for Figure 5 Exploded diagram of

[0027] Figure 7 for Figure 6 A schematic diagram of the locking member structure;

[0028] Figure 8 for Figure 6 A schematic diagram of the pressure member structure;

[0029] Fig. 9 for Figure 6 Schematic diagram of the limit block and positioning block structure;

[0030] Fig.10 for Figure 6 The cross-sectional view of the seal structure in FIG.

[0031] Fig.11 for Figure 6 The cross-sectional view of the limiter structure in FIG.

[0032] Fig.12 for Figure 6 The cross-sectional view of the mounting structure;

[0033] Fig.13 It is a schematic diagram of the unlocking state of the unlocking member, the locking member, the pressure member, the limiting member and the positioning member structure in the present invention;

[0034] Fig.14 It is a schematic diagram of the installation state of the pressure member, the limit member, the spring, the limit member and the installation member structure in the present invention;

[0035] Fig.15 for Figure 4 A local enlarged view of point B in FIG.

[0036] Fig.16 It is a schematic diagram of the structure of the compression stage of the compressed air energy storage in the present invention;

[0037] Fig.17 It is a schematic diagram of the expansion stage structure of the compressed air energy storage in the present invention.

[0038] In the figure: body 1, injection assembly 2, limit block 3, positioning block 4, locking member 5, partition 6, cooling shell 7, mounting hole 8, mounting member 9, pressure member 10, limit member 11, sealing member 12, first threaded portion 13, first threaded hole 14, spring 15, second threaded portion 16, second threaded hole 17, annular groove 18, annular support 19, first through hole 20, annular protrusion 21, carrier 22, first active area 23, second active area 24, placement body 25, support surface 26, elastic arm 27, first undercut portion 28, third through hole 29, stepped hole 30, stepped surface 31, sealing disk 32, movable cylinder 3 3. second through hole 34, sealing portion 35, accommodating hole 36, notch 37, first vertical surface 38, first arcuate surface 39, second vertical surface 40, second arcuate surface 41, annular recess 42, first cylinder 43, second cylinder 44, positioning portion 45, mounting plate 46, positioning hole 47, cover plate 48, fixing body 49, connecting arc segment 50, limiting area 51, second undercut portion 52, guiding inclined surface 53, positioning protrusion 54, annular arc segment 55, first inclined surface 56, bearing surface 57, second inclined surface 58, contact surface 59, avoidance groove 60, sealing surface 61, unlocking member 62, guide surface 63, third arcuate surface 64. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] like Figures 1 to 17 As shown, the screw compressor with forward and reverse compression and expansion of the present invention comprises a body 1, an injection assembly 2, a limit block 3 and a positioning block 4. The limit block 3 and the injection assembly 2 are used to limit the position of the injection assembly 2 and ensure the stable installation of the injection assembly 2. The injection assembly 2 is used in conjunction with the locking member 5 to achieve a secondary sealing effect, thereby preventing external impurities from entering the cooling shell 7 and preventing the internal oil from leaking.

[0041] A partition 6 and a cooling shell 7 are provided on the machine body 1. The cooling shell 7 and the partition 6 are installed on the machine body 1 by bolts. The partition 6 is used to separate the machine body 1 and the cooling shell 7, and then a screw is installed inside the machine body 1. Gears are arranged in the cooling shell 7. The gears need to be lubricated and cooled by engine oil during movement.

[0042] The injection assembly 2 is arranged on the cooling shell 7, and the cooling shell 7 is provided with a mounting hole 8, and the injection assembly 2 is arranged in the mounting hole 8. The injection assembly 2 is provided with a mounting member 9, a pressure member 10, a stopper 11 and a sealing member 12. The mounting member 9 is used to connect with the cooling shell 7, and the pressure member 10 is used to connect with the external oil injection pipe. The stopper 11 is used to realize the connection between the sealing member 12 and the mounting member 9, so that the sealing member 12 can seal between the mounting member 9 and the outside, and at the same time, the position of the sealing member 12 and the pressure member 10 is limited by the stopper 11 to prevent the sealing member 12 and the pressure member 10 from being separated from the mounting member 9.

[0043] The lower end of the mounting member 9 is provided with a first threaded portion 13, and the interior of the mounting hole 8 is provided with a first threaded hole 14 that matches the first threaded portion 13. The stopper 11 cooperates with the pressure member 10 to set the seal 12 in the middle of the mounting member 9, and a spring 15 is provided between the mounting member 9 and the seal 12, and the spring 15 pushes the seal 12 to move upward to maintain the seal between the seal 12 and the mounting member 9. The upper end of the spring 15 contacts the seal 12, and the lower end contacts the mounting member 9. The pressure member 10 is provided with a second threaded portion 16, and the seal 12 is provided with a second threaded hole 17 that matches the second threaded portion 16.

[0044] The limit block 3 and the symmetrically arranged positioning block 4 are arranged on the cooling shell 7, the pressure piece 10 is provided with an annular groove 18, the pressure piece 10 is provided with a locking piece 5 that cooperates with the annular groove 18, and the locking piece 5 is installed on the pressure piece 10 through the positioning block 4 and the limit block 3.

[0045] An annular support 19 is provided on the outer wall of the mounting member 9, and the annular support 19 is used to support the spring 15. A first through hole 20 is formed in the middle of the mounting member 9, and the first through hole 20 is used to install the limiting member 11 and the sealing member 12.

[0046] An annular protrusion 21 and a carrier 22 are provided on the inner wall of the first through hole 20. The annular protrusion 21 is used to limit the position of the sealing member 12, and the carrier 22 is used to limit the downward movement distance of the sealing member 12. A first active area 23 is formed between the limiting member 11 and the pressure member 10, and a second active area 24 is formed between the sealing member 12 and the limiting member 11.

[0047] The limiting member 11 is installed in the first through hole 20. The lower end of the limiting member 11 is provided with a placement body 25 that cooperates with the carrier 22. The placement body 25 is provided with a support surface 26, and the support surface 26 is used to support the sealing member 12. An elastic arm 27 is provided at the upper end of the limiting member 11, and a first undercut portion 28 is provided on the elastic arm 27. The first undercut portion 28 on the elastic arm 27 is used to limit the position of the pressure member 10. A third through hole 29 and a stepped hole 30 are formed in the middle of the pressure member 10. The stepped hole 30 is arranged at the lower end of the third through hole 29. The inner diameter of the stepped hole 30 is smaller than the inner diameter of the third through hole 29. A stepped surface 31 is formed between the third through hole 29 and the stepped hole 30. The first undercut portion 28 is placed on the stepped surface 31 between the stepped hole 30 and the third through hole 29.

[0048] The seal 12 is composed of a sealing disk 32 and a movable cylinder 33. A second through hole 34 is formed in the middle of the seal 12, and a sealing portion 35 is provided inside the movable cylinder 33. A receiving hole 36 for receiving the stopper 11 is formed between the sealing portion 35 and the inner wall of the movable cylinder 33. A notch 37 matching the placement body 25 is formed at the lower end of the movable cylinder 33. When the seal 12 moves downward, the notch 37 can be placed on the placement body 25, and the first vertical surface 38 and the first arc surface 39 on the seal 35 are ensured to be separated from the second vertical surface 40 and the second arc surface 41 on the stopper 11, thereby maintaining a gap between the stopper 11 and the seal 12, so as to facilitate the flow of engine oil into the cooling shell 7.

[0049] An annular recess 42 cooperating with the annular protrusion 21 is provided on the outer wall of the movable cylinder 33 . The height of the annular recess 42 is greater than that of the annular protrusion 21 , so that the annular protrusion 21 can move up and down in the annular recess 42 .

[0050] The pressure member 10 is composed of a first cylinder 43 and a second cylinder 44, wherein the second cylinder 44 is disposed at the lower end of the first cylinder 43, and the first cylinder 43 and the second cylinder 44 are connected via an annular groove 18. A positioning portion 45 is disposed at the bottom of the pressure member 10, and a positioning hole 47 is disposed in the middle of the mounting plate 46. The positioning portion 45 cooperates with the positioning hole 47, so that the second threaded portion 16 is matched and installed with the second threaded hole 17.

[0051] Since the mounting member 9 is fixed, when the pressure member 10 is pressed, the spring 15 is compressed, driving the sealing member 12 to press downward and move in the first active area 23 and the second active area 24, but the limiting member 11 is supported by the carrier 22, so it will not move downward, and a third arc surface 64 is provided on the limiting member 11, and the arc angle of the arc surface 64 is greater than 180°, so that it can be installed in the second through hole 34 without deviation, and the injection of engine oil can be ensured at the same time.

[0052] The locking member 5 is composed of a cover plate 48, a fixing body 49 is provided on the lower end surface of the cover plate 48, and symmetrically arranged elastic arms 27 are provided on the fixing body 49. A connecting arc segment 50 is provided between the elastic arms 27 at one end close to the fixing body 49, and a limiting area 51 for accommodating the limiting block 3 is formed at the end away from the fixing body 49.

[0053] The elastic arm 27 is provided with a second undercut portion 52, which is located in the limiting area 51, and a guiding inclined surface 53 is provided on the second undercut portion 52. A positioning protrusion 54 cooperating with the positioning block 4 is provided in the middle of the elastic arm 27, and an annular arc segment 55 cooperating with the annular groove 18 is provided on the connecting arc segment 50. A first inclined surface 56 and a bearing surface 57 are provided in the annular groove 18, and a second inclined surface 58 cooperating with the first inclined surface 56 and a contact surface 59 cooperating with the bearing surface 57 are provided on the annular arc segment 55.

[0054] An escape groove 60 is formed between the cover plate 48 and the elastic arm 27 . A sealing surface 61 is provided in the escape groove 60 . The sealing surface 61 is disposed on the third through hole 29 to seal the third through hole 29 .

[0055] The elastic arm 27 remains tilted when not installed, and the tilt angle decreases after installation. The distance between the limiting areas 51 before installation is H1, and the distance after installation is H2, H1<H2, so that the second undercut portion 52 is clamped on the limiting block 3 and locked.

[0056] The distance between the elastic arms 27 and 27 is greater than the diameter of the first cylinder 43 and the second cylinder 44 on the pressure member 10. Therefore, when installing the locking member 5, the guiding inclined surface 53 on the second undercut portion 52 is first used to guide, and then the distance between the elastic arms 27 is increased, so as to facilitate the first cylinder 43 to enter between the elastic arms 27 and 27. Then, the positioning protrusion 54 is placed between the limit block 3 and the positioning block 4, and then the locking member 5 is pushed toward the limit block 3, so that the second undercut portion 52 on the opened elastic arm 27 passes over the limit block 3, and then the locking member 5 is pressed down, so that the connecting arc segment 50 enters the annular groove 18, and the elastic arm 27 is reset under its own elastic force and clamped on the limit block 3, so that the locking member 5 is locked.

[0057] When removing the locking member 5, the unlocking member 62 is required. The unlocking member 62 is provided with a symmetrical guide surface 63. The guide surface 63 cooperates with the guide inclined surface 53 to push the elastic arm 27 to open, and then pull the locking member 5 toward the positioning block 4, so that the connecting arc segment 50 is disengaged from the annular groove 18, and then the locking member 5 can be picked up, and then the oil filling pipe is connected to the third through hole 29 of the pressure member 10, and then the pressure member 10 is pressed to realize the oil filling operation. After the oil filling is completed, the spring 15 pushes the pressure member 10 to move up to achieve automatic sealing.

[0058] like Fig.16 and 17 As shown, this application optimizes the structure and operation mode of the existing screw compressor in view of the characteristics that the compressed air energy storage field requires both a compressor and an expander. Its main innovations are as follows: When the screw compressor rotor rotates, the chamber formed at the suction end gradually decreases in volume as the screw rotates, thereby compressing the gas. On the contrary, the screw reverses and the chamber gradually expands, so that the suction end of the compression process becomes the discharge end, and the discharge end of the compression process becomes the suction end, thereby realizing the gradual expansion process of high-pressure gas.

[0059] The schematic diagram of this application is a simulation of the operating nodes of the entire system. Taking 6Mpa compressed air energy storage as an example, the equipment therein is mainly composed of No. 1 compression expander, No. 2 compression expander, No. 3 compression expander, heat exchanger and high-pressure storage tank.

[0060] This application takes the 6Mpa compressed air energy storage system as an example to describe the product, which is not limited to the medium and the pressure can reach 3-16Mpa. The entire system process is mainly divided into two stages, the energy storage stage and the energy release and power generation stage.

[0061] Energy storage stage: During the low-peak period of electricity consumption at night, the normal temperature and pressure gaseous air in the atmosphere is compressed step by step through the forward rotation of the screw of the compression expansion unit to form high-temperature and high-pressure gaseous air. The generated heat energy is cooled through the heat exchange system and stored, completing the process of air compression and energy storage at night.

[0062] Energy release stage: During the peak period of electricity consumption during the day, the normal temperature and high pressure gaseous air in the high pressure tank is expanded step by step through the reverse rotation of the screw of the compression expansion unit. The low pressure and high speed airflow generated drives the generator to generate electricity, forming low temperature and low pressure gaseous air. The generated cold energy is heated up through the heat exchange system, the heat energy is consumed, and the cold energy is stored, completing the process of air expansion and power generation during the day.

[0063] The compression in the entire energy storage stage and the expansion and power generation in the energy release stage are all completed by the same set of screw compressors, that is, the dual functions of compression and expansion are achieved through the forward and reverse rotation of the screw inside the screw compressor.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw compressor with forward and reverse compression and expansion, characterized in that: include: The machine body is provided with a partition and a cooling shell, and the cooling shell and the partition are mounted on the machine body by bolts. An injection assembly is arranged on a cooling shell, the cooling shell is provided with a mounting hole, the injection assembly is arranged in the mounting hole, the injection assembly is provided with a mounting piece, a pressure piece, a limit piece and a sealing piece, the lower end of the mounting piece is provided with a first threaded portion, the interior of the mounting hole is provided with a first threaded hole matched with the first threaded portion, the limit piece cooperates with the pressure piece to arrange the sealing piece in the middle of the mounting piece, a spring is provided between the mounting piece and the sealing piece, the spring pushes the sealing piece to move upward to maintain a seal between the sealing piece and the mounting piece, the pressure piece is provided with a second threaded portion, and the sealing piece is provided with a second threaded hole matched with the second threaded portion, A limit block and a symmetrically arranged positioning block are arranged on the cooling shell, the pressure piece is provided with an annular groove, the pressure piece is provided with a locking piece that cooperates with the annular groove, and the locking piece is installed on the pressure piece through the positioning block and the limit block; An annular support is provided on the outer wall of the mounting member, the annular support is used to support the spring, and a first through hole is formed in the middle of the mounting member; An annular protrusion and a carrier are provided on the inner wall of the first through hole; The limiting member is installed in the first through hole, the lower end of the limiting member is provided with a placement body matched with the carrier, the upper end is provided with an elastic arm, and the elastic arm is provided with a first undercut portion; The sealing member is composed of a sealing disk and a movable cylinder, a second through hole is formed in the middle of the sealing member, a sealing portion is provided inside the movable cylinder, a receiving hole for receiving the limiter is formed between the sealing portion and the inner wall of the movable cylinder, and an annular recess is provided on the outer wall of the movable cylinder to cooperate with the annular protrusion; A third through hole and a stepped hole are formed in the middle of the pressure member, the stepped hole is arranged at the lower end of the third through hole, the inner diameter of the stepped hole is smaller than the inner diameter of the third through hole, a stepped surface is formed between the third through hole and the stepped hole, and the first undercut portion is placed on the stepped surface between the stepped hole and the third through hole.

2. The screw compressor with forward and reverse compression and expansion according to claim 1, characterized in that: A first active area is formed between the limiting member and the pressure member, and a second active area is formed between the sealing member and the limiting member.

3. The screw compressor with forward and reverse compression and expansion according to claim 1, characterized in that: The locking member is composed of a cover plate, a fixing body is provided on the lower end surface of the cover plate, symmetrically arranged elastic arms are provided on the fixing body, a connecting arc segment is provided between the elastic arms at one end close to the fixing body, and a limiting area for accommodating a limiting block is formed at the end away from the fixing body.

4. The screw compressor with forward and reverse compression and expansion according to claim 3, characterized in that: The elastic arm is provided with a second undercut portion, the second undercut portion is in the limiting area, the second undercut portion is provided with a guiding slope, the middle of the elastic arm is provided with a positioning protrusion that cooperates with the positioning block, and the connecting arc segment is provided with an annular arc segment that cooperates with the annular groove.

5. The screw compressor with forward and reverse compression and expansion according to claim 4, characterized in that: An escape groove is formed between the cover plate and the elastic arm, and a sealing surface is arranged in the escape groove.

Images