Large-air-flow low-pressure energy-saving screw air compressor

Abstract

The utility model discloses a large-air-flow low-pressure energy-saving screw air compressor which comprises an air compressor main machine, an air filtering mechanism, an air suction box and an oil-gas separation mechanism, the air filtering mechanism comprises a plurality of air filters, the air filters are installed on the air suction box, and the oil-gas separation mechanism is installed on the air suction box. The multiple air filters are arranged in the air suction box, the input ends of the multiple air filters communicate with the multiple openings in the air suction box correspondingly, the output ends of the multiple air filters communicate with the input end of the air compressor main machine, the oil-gas separation mechanism comprises multiple oil-gas separators, and the oil-gas separators are used for separating oil-gas mixtures. The output end of the air compressor main machine communicates with the multiple oil-gas separators. According to the large-air-flow low-pressure energy-saving screw air compressor, the service life of an air filtering system is prolonged, the internal pressure drop of the air compressor is effectively reduced, and the overall energy efficiency of the air compressor is improved.

Description

Technical Field

[0001] The utility model specifically relates to a large-volume, low-pressure, energy-saving screw air compressor. Background Art

[0002] With the development of domestic light industry and the upgrading of enterprise equipment, the pressure requirements for air compressors in many industries, such as textiles and glass, have dropped to 3-3.5 bar. At the same time, due to limited factory land, equipment procurement is primarily focused on high-capacity equipment. The low pressure and high-capacity characteristics of the air compressor place high demands on the air filtration system and oil-gas separation system.

[0003] The air filtration system is used to filter impurities before air compression and is an important part of ensuring the normal operation of the air compressor. The conventional design of a large-volume air filtration system is to make an iron filter box and install multiple air filter elements in it. This method has high requirements on the air tightness of the filter box and is difficult to manufacture. At the same time, this design abandons the original pre-filtration system of the air filter, which will increase the burden on the filter element and reduce its service life.

[0004] The oil-gas separation system is used to separate the oil-gas mixture compressed by the air compressor main unit into clean compressed air and compressor lubricating oil. The system consists of an oil-gas separator and an oil filter element. The oil-gas separator mainly performs primary separation of the oil-gas mixture, which can remove the vast majority of the lubricating oil. The oil filter element performs secondary fine separation on the compressed air after primary separation, removing the remaining lubricating oil and ensuring the cleanliness of the compressed air. Due to the production and processing capabilities of many oil-gas separator manufacturers, the size of the oil-gas separator cannot be made too large, which also causes the external dimensions of the oil filter element installed in the oil-gas separator to be relatively small. Increasing the processing capacity of the oil filter element can only be achieved by increasing the internal filter area of ​​the oil filter element. For example, by using an inner and outer letter core, that is, by adding an oil separator core inside the original oil separator core for a third filtration to achieve oil-gas separation. This method invisibly doubles the pressure drop of the oil separator core, which is not conducive to the overall energy saving of the air compressor. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a large-volume, low-pressure, energy-saving screw air compressor in response to the above-mentioned deficiencies in the prior art. The large-volume, low-pressure, energy-saving screw air compressor is beneficial to prolonging the service life of the air filtration system, and effectively reducing the internal pressure drop of the air compressor, thereby improving the overall energy efficiency of the air compressor.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A large-volume, low-pressure, energy-saving screw air compressor comprises an air compressor main unit, an air filtering mechanism, an air intake box, and an oil-gas separation mechanism. The air filtering mechanism comprises a plurality of air filters, which are mounted on the air intake box, and the input ends of the plurality of air filters are respectively connected to a plurality of openings on the air intake box, and the output ends of the plurality of air filters are all connected to the input end of the air compressor main unit. The oil-gas separation mechanism comprises a plurality of oil-gas separators, which are used to separate an oil-gas mixture, and the output end of the air compressor main unit is respectively connected to a plurality of oil-gas separators.

[0008] Preferably, two air filters are provided, and the two air filters are arranged in parallel; two oil-gas separators are provided, and the two oil-gas separators are arranged in parallel.

[0009] Preferably, the large-volume, low-pressure, energy-saving screw air compressor also includes a connecting pipe, and the connecting pipe includes a first pipe and a second pipe, one end of the first pipe is connected to the input end of the air compressor main unit, and the other end is divided into two paths and respectively connected to the output ends of two air filters; one end of the second pipe is connected to the output end of the air compressor main unit, and the other end is divided into two paths and respectively connected to the input ends of two oil-gas separators.

[0010] Preferably, the first pipeline is connected to the output end of the air filter through an air suction hose, and the air suction hose is used to filter the vibration of the air compressor host during operation.

[0011] Preferably, an air intake valve is provided on the first pipeline, and the air intake valve is used to control the unidirectional flow of compressed gas and proportionally adjust the gas volume.

[0012] Preferably, a partition is provided in the oil-gas separator, which divides the interior of the oil-gas separator into a primary separation area and a fine separation area. The lubricating oil in the oil-gas mixture settles to the bottom of the oil-gas separator in the primary separation area, and the gas in the oil-gas mixture enters the fine separation area through the partition. The fine separation area is provided with an oil-gas separation filter element, which is used to remove residual lubricating oil.

[0013] Preferably, the connecting pipeline further includes a third pipeline and a fourth pipeline, wherein both ends of the third pipeline are respectively connected to the primary separation areas of the two oil-gas separators, and both ends of the fourth pipeline are respectively connected to the fine separation areas of the two oil-gas separators.

[0014] Preferably, the connecting pipe also includes a fifth pipe, one end of the fifth pipe is connected to the fourth pipe, and the other end is connected to the compressed air cooling equipment. The compressed air separated in the oil-gas separator enters the fifth pipe through the fourth pipe, and enters the compressed air cooling equipment from the fifth pipe for cooling treatment.

[0015] Preferably, a minimum pressure valve is provided on the fifth pipeline, and the minimum pressure valve is used to control the unidirectional flow of compressed gas and control the minimum operating internal pressure of the air compressor.

[0016] The large-volume, low-pressure, energy-saving screw air compressor in this utility model is equipped with two parallel air filters on the air intake box. The air inlets of the two air filters are exposed to the atmosphere at the same position, and the air outlets are connected and merged before entering the air compressor main unit. This ensures that the pressure difference between the front and back of the two air filters is consistent, the filtering volume is consistent, and the service life is nearly the same. The two air filters can be replaced at the same time, saving air filter replacement time. In addition, the air filtration mechanism in this utility model can retain the original pre-filtration function of the air filter, improving the filtering effect while also extending the service life of the air filter.

[0017] The utility model adopts two oil-gas separators connected in parallel, which effectively solves the problem of difficulty in manufacturing large-sized oil-gas separators in the existing technology, thereby increasing the external dimensions of the oil filter element, effectively reducing the pressure drop of the oil filter element, improving the overall energy efficiency of the air compressor, and achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the large-volume, low-pressure, energy-saving screw air compressor in Example 1 of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the air suction box in Example 1 of the present utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the suction box in Example 1 of the present utility model;

[0021] Figure 4 This is a schematic diagram of the connection between the air compressor main unit and the air filter in Example 1 of the present utility model;

[0022] Figure 5 This is a schematic diagram of the connection between the air compressor main unit and the oil-gas separator in Example 1 of the present utility model;

[0023] Figure 6 This is a diagram of the internal structure of the oil-gas separator in Example 1 of the present utility model.

[0024] In the figure: 100-air compressor main unit, 110-electric motor, 200-air filter, 300-oil-gas separator, 310-spacer, 320-primary separation area, 330-fine separation area, 340-oil-gas separation filter element, 400-first pipeline, 410-second pipeline, 420-third pipeline, 430-fourth pipeline, 440-fifth pipeline, 450-intake hose, 460-interference joint, 470-intake valve, 480-minimum pressure valve, 500-compressed air cooling equipment, 600-intake box, 610-guide sealing plate. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions of the utility model in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of the utility model.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "connect," "dispose," "install," "fix," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0029] The utility model provides a large-volume, low-pressure, energy-saving screw air compressor, comprising an air compressor main unit, an air filtering mechanism, an air intake box, and an oil-gas separation mechanism. The air filtering mechanism comprises a plurality of air filters, which are mounted on the air intake box, and the input ends of the plurality of air filters are respectively connected to a plurality of openings on the air intake box, and the output ends of the plurality of air filters are all connected to the input end of the air compressor main unit. The oil-gas separation mechanism comprises a plurality of oil-gas separators, which are used to separate an oil-gas mixture, and the output ends of the air compressor main unit are respectively connected to the plurality of oil-gas separators.

[0030] Example 1

[0031] like Figure 1-6 As shown, this embodiment discloses a large-volume, low-pressure, energy-saving screw air compressor, comprising an air compressor main unit 100, an air filtration mechanism, an air intake box 600, and an oil-gas separation mechanism. The air filtration mechanism includes a plurality of air filters 200, which are mounted on the air intake box 600. The input ends of the plurality of air filters 200 are respectively connected to a plurality of openings on the air intake box 600, and the output ends of the plurality of air filters 200 are all connected to the input end of the air compressor main unit 100. The oil-gas separation mechanism includes a plurality of oil-gas separators 300, which are used to separate the oil-gas mixture. The output ends of the air compressor main unit 100 are respectively connected to the plurality of oil-gas separators 300.

[0032] The air compressor main unit 100 compresses the sucked gas. During the compression process, lubricating oil is injected through the internal oil passage for cooling, sealing, and noise reduction. Therefore, what is finally discharged from the air compressor main unit 100 is an oil-gas mixture.

[0033] In this embodiment, two air filters 200 are provided, arranged in parallel. Accordingly, the air intake box 600 has two openings, and the two air filters 200 are mounted on the air intake box 600, with their input ends connected to the two openings in the air intake box 600. Ambient air at the same location enters the two air filters 200 through the openings in the air intake box 600, thereby ensuring that the atmospheric pressure at the air inlets of the two air filters 200 is consistent. In this embodiment, two oil-gas separators 300 are provided, arranged in parallel.

[0034] like Figure 2 、 3 As shown, the outer end face of the air intake box is provided with a guide sealing plate 610, and a sound-absorbing and noise-reducing sponge is attached to the guide sealing plate 610 to reduce the noise during air intake, while preventing the air intake port of the air filter 200 from being directly exposed to the outside, preventing larger objects from being sucked in when the equipment is running, causing damage to the equipment, and avoiding harm to the operator.

[0035] like Figure 4 、 5 As shown, the high-volume, low-pressure, energy-saving screw air compressor also includes connecting pipes, including a first pipe 400 and a second pipe 410. One end of the first pipe 400 is connected to the input of the air compressor main unit 100, and the other end is divided into two paths, which are respectively connected to the output ends of the two air filters 200. In other words, the compressed air filtered by the two air filters 200 is combined through the first pipe 400 before entering the air compressor main unit 100.

[0036] like Figure 4 As shown, the first pipeline 400 includes a main pipe and a branch pipe. The bottom end of the main pipe is connected to the input end of the air compressor main unit 100. The branch pipe has two branches, which respectively connect the two air filters 200 and the main pipe. The two branch pipes are suction hoses 450, which can filter vibrations during the operation of the air compressor main unit 100.

[0037] One end of the second pipe 410 is connected to the output of the air compressor main unit 100, and the other end is split into two paths, each connected to the input of the two oil-gas separators 300. In other words, the compressed air and lubricating oil mixture compressed by the air compressor main unit 100 enters the two oil-gas separators 300 separately, ensuring that the gas pressure entering the two oil-gas separators 300 is the same.

[0038] like Figure 5 As shown, the second pipeline 410 also includes a main pipe and two branch pipes. The bottom end of the main pipe is connected to the output end of the air compressor main unit 100, and the other end is divided into two paths and connected to the two branch pipes. Specifically, the two branch pipes are connected to the main pipe via a flexible joint 460. The flexible joint 460 is equipped with a rubber sealing ring inside. This seals and filters the vibration of the air compressor main unit 100 during operation, avoids the rigid connection between the oil-gas separator 300 and the air compressor main unit 100, and increases the stability of the air compressor main unit 100.

[0039] like Figure 4 As shown, an air intake valve 470 is provided on the first pipeline 400. The air intake valve 470 is a check valve used to control the compressed gas to flow only from the air filter 200 to the air compressor main unit 100, and also has the function of proportionally adjusting the gas volume and loading and unloading control.

[0040] like Figure 6 As shown, the oil-gas separator 300 is a cylindrical body with an annular partition 310 disposed therein. The partition 310 divides the interior of the oil-gas separator 300 into a primary separation area 320 and a fine separation area 330. The outlet of the second pipe 410 is connected to the primary separation area 320 of the oil-gas separator 300, and is used to transport the oil-gas mixture to the primary separation area 320. In the primary separation area 320, the oil-gas mixture continuously rotates and falls along the annular area between the outer wall of the cylinder and the partition. The majority of the lubricating oil in the oil-gas mixture settles to the bottom of the oil-gas separator 300 in the primary separation area 320, while the gas enters the fine separation area 330 through the partition 310.

[0041] The fine separation area 330 is provided with an oil-gas separation filter element 340 . Gas with a small amount of lubricating oil passes through the oil-gas separation filter element 340 to remove the residual lubricating oil, and the clean compressed air is discharged through the top outlet of the oil-gas separator 300 .

[0042] In this embodiment, the connecting pipes further include a third pipe 420 and a fourth pipe 430. The ends of the third pipe 420 are connected to the primary separation areas 320 of the two oil-gas separators 300, respectively. This ensures that the internal pressures of the two oil-gas separators 300 are consistent, and thus that the flow rate of the oil-gas mixture entering the two oil-gas separators 300 is the same. If the oil-gas separation filter element 340 becomes clogged, this may result in different internal pressures in the two oil-gas separators 300. Inconsistent internal pressures can cause inconsistent gas flow rates entering the two oil-gas separators 300, resulting in a greater separation load on the side with the greater gas flow rate, suboptimal separation performance, and oil leakage.

[0043] The two ends of the fourth pipe 430 are respectively connected to the fine separation areas 330 of the two oil-gas separators 300. Specifically, the fourth pipe 430 is connected to the top openings of the two oil-gas separators 300 to ensure that the pressure of the compressed air remains consistent after the secondary fine separation through the oil-gas separation filter element 340.

[0044] like Figure 5 As shown, the connecting pipeline also includes a fifth pipeline 440, one end of the fifth pipeline 440 is connected to the middle of the fourth pipeline 430, that is, the top openings of the two oil-gas separators 300 are connected to the fifth pipeline 440; the other end of the fifth pipeline 440 is connected to the compressed air cooling equipment 500, and the compressed air separated in the oil-gas separator 300 enters the fifth pipeline 440 through the fourth pipeline 430, and enters the compressed air cooling equipment 500 from the fifth pipeline 440 for cooling treatment. The cooled compressed air is transported to the gas-using end for use.

[0045] In this embodiment, a minimum pressure valve 480 is provided on the fifth pipeline 440. The minimum pressure valve 480 is used to control the compressed gas to flow only from the fourth pipeline 430 to the fifth pipeline 440, and to control the minimum operating internal pressure of the air compressor.

[0046] In this embodiment, an oil drain pipe is provided at the bottom of the oil-gas separator 300, which is connected to the air compressor main unit 100. The separated lubricating oil re-enters the air compressor main unit 100 through the oil drain pipe for recycling.

[0047] like Figure 4 As shown, an electric motor 110 is provided near the air compressor main unit 100 , and the electric motor 110 is used to drive the air compressor main unit 100 to move.

[0048] The working process of the large volume low pressure energy-saving screw air compressor of this embodiment is as follows:

[0049] Air filtration process:

[0050] The starting motor 110 drives the air compressor main unit 100 to run, and relies on the negative pressure of the air intake port of the air compressor main unit 100 to suck air from the atmosphere into the air filter 200. The sucked air is divided equally into two air filters 200. The air is first pre-filtered in the two air filters 200 (in the flow channel of the air filter 200 outer shell, cyclone separation is performed by centrifugal force to separate larger particles, and the larger particles are concentrated in the air filter dust hopper driven by wind). The air after cyclone separation is then filtered with high precision through the filter element in the air filter. The filtered air is collected at the valve port of the intake valve 470 through the first pipe 400, and then enters the air compressor main unit 100 for compression after passing through the intake valve 470.

[0051] Oil and gas separation process:

[0052] After compression by the air compressor main unit 100, the oil-gas mixture enters the two oil-gas separators 300 through the second pipeline 410. The oil-gas mixture first enters the primary separation area 320 of the oil-gas separator 300, where it undergoes cyclonic separation to separate the majority of the lubricating oil and converge at the bottom. After the primary separation, the compressed air passes through the oil-gas separation filter 340 for fine separation to remove the remaining lubricating oil. Finally, the clean compressed air enters the fourth pipeline 430 and the fifth pipeline 440 through the top opening of the oil-gas separator 300. The two pipelines merge into one, then pass through the minimum pressure valve 480 and enter the post-compressed air cooling device 500 for cooling before being delivered to the gas user.

[0053] The oil-gas separation system of this embodiment adopts two parallel oil-gas separators 300, which effectively solves the problem of difficulty in manufacturing large-sized oil-gas separators 300 in the prior art, thereby improving the external dimensions of the oil filter element, effectively reducing the pressure drop of the oil filter element, and improving the overall energy efficiency of the air compressor, achieving energy-saving effects.

[0054] The large-volume, low-pressure, energy-saving screw air compressor of this embodiment is equipped with two parallel air filters 200 on the air intake box 600. The air inlets of the two air filters 200 are connected to the atmosphere at the same position, and the air outlets are connected and merged before entering the air compressor main unit 100. This ensures that the front-to-back pressure difference of the two air filters 200 is consistent, the filtering volume is consistent, and the service life is nearly the same. Both air filters 200 can be replaced at the same time, saving the replacement time of the air filters 200. In addition, the air filtration mechanism of the present invention can retain the original pre-filtration function of the air filter 200, improving the filtering effect while also extending the service life of the air filter 200.

[0055] The above-mentioned oil-gas separator 300 and air filter 200 are both conventional general products, which can realize the commonality of key components and have high versatility, can reduce procurement costs, reduce the difficulty and cost of component production, and shorten the production cycle.

[0056] Furthermore, the primary separation area 320 and the final separation area 330 of the two oil-gas separators 300 are connected via the third pipe 420 and the fourth pipe 430, respectively. This effectively ensures that the pressures in the two oil-gas separators 300 are consistent before the oil-gas mixture enters the system, at the end of primary separation, and at the end of final separation, thereby ensuring a consistent separation rate in the two oil-gas separators 300. Furthermore, the two oil-gas separators 300 are conventional products with high versatility, which can reduce procurement costs and time.

[0057] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A large volume, low pressure and energy-saving screw air compressor, characterized in that: It comprises an air compressor main unit (100), an air filtering mechanism, an air suction box (600), and an oil-gas separation mechanism. The air filtering mechanism comprises a plurality of air filters (200), wherein the plurality of air filters (200) are mounted on the air suction box (600), and the input ends of the plurality of air filters (200) are respectively connected to a plurality of openings on the air suction box (600), and the output ends of the plurality of air filters (200) are all connected to the input end of the air compressor main unit (100). The oil-gas separation mechanism comprises a plurality of oil-gas separators (300), the oil-gas separators (300) being used to separate the oil-gas mixture, and the output ends of the air compressor main engine (100) are respectively connected to the plurality of oil-gas separators (300).

2. The large volume, low pressure and energy-saving screw air compressor according to claim 1 is characterized in that: The air filters (200) are provided with two, and the two air filters (200) are arranged in parallel; Two oil-gas separators (300) are provided, and the two oil-gas separators (300) are arranged in parallel.

3. The large volume, low pressure and energy-saving screw air compressor according to claim 2 is characterized in that: Also included is a connecting pipeline, wherein the connecting pipeline includes a first pipeline (400) and a second pipeline (410), One end of the first pipe (400) is connected to the input end of the air compressor main unit (100), and the other end is divided into two paths and respectively connected to the output ends of two air filters (200); One end of the second pipeline (410) is connected to the output end of the air compressor main unit (100), and the other end is divided into two paths and respectively connected to the input ends of the two oil-gas separators (300).

4. The large volume, low pressure and energy-saving screw air compressor according to claim 3 is characterized in that: The first pipeline (400) is connected to the output end of the air filter (200) via an air suction hose (450), and the air suction hose (450) is used to filter vibrations generated when the air compressor main unit (100) is in operation.

5. The large volume, low pressure and energy-saving screw air compressor according to claim 3 is characterized in that: The first pipeline (400) is provided with an air intake valve (470), and the air intake valve (470) is used to control the unidirectional flow of compressed gas and proportionally adjust the gas volume.

6. The large volume, low pressure and energy-saving screw air compressor according to claim 3 is characterized in that: The oil-gas separator (300) is provided with a partition (310), and the partition (310) divides the interior of the oil-gas separator (300) into a primary separation area (320) and a fine separation area (330). The lubricating oil in the oil-gas mixture settles to the bottom of the oil-gas separator (300) in the primary separation area (320), and the gas in the oil-gas mixture enters the fine separation area (330) through the partition (310). The fine separation area (330) is provided with an oil-gas separation filter element (340), and the oil-gas separation filter element (340) is used to remove residual lubricating oil.

7. The large volume, low pressure and energy-saving screw air compressor according to claim 6 is characterized in that: The connecting pipeline further includes a third pipeline (420) and a fourth pipeline (430), The two ends of the third pipeline (420) are respectively connected to the primary separation areas (320) of the two oil-gas separators (300). Both ends of the fourth pipeline (430) are respectively connected to the fine separation areas (330) of the two oil-gas separators (300).

8. The large volume, low pressure and energy-saving screw air compressor according to claim 7 is characterized in that: The connecting pipeline also includes a fifth pipeline (440), one end of which is connected to the fourth pipeline (430), and the other end of which is connected to the compressed air cooling device (500). The compressed air separated in the oil-gas separator (300) enters the fifth pipeline (440) through the fourth pipeline (430), and enters the compressed air cooling device (500) from the fifth pipeline (440) for cooling.

9. The large volume, low pressure and energy-saving screw air compressor according to claim 8, characterized in that: The fifth pipeline (440) is provided with a minimum pressure valve (480), and the minimum pressure valve (480) is used to control the unidirectional flow of compressed gas and control the minimum operating internal pressure of the air compressor.

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