A new water-lubricated screw air compressor

Abstract

This invention provides a novel water-lubricated screw air compressor, relating to the field of air compressors. The front and rear partitions of the casing, and the front and rear end covers of the casing, are secured together by a tie rod assembly and locking components, forming a high-rigidity unit. A shaft seal completely separates the compression chamber from the two end isolation and heat dissipation chambers, preventing water vapor and airflow from entering the chamber. Simultaneously, the independent isolation and heat dissipation chambers provide heat dissipation for the rotating parts while offering new air intake points for the male and female rotors, improving air compression efficiency. Through an integrated technical solution encompassing overall structural innovation, optimized material selection, integrated air path design, and sealing and isolation protection, this invention comprehensively addresses industry pain points of traditional air compressors, such as high processing difficulty, high cost, easy bearing corrosion and contamination, low heat dissipation efficiency, easy air source contamination, and poor structural stability, from core dimensions including manufacturing cost, structural strength, corrosion resistance, heat dissipation and lubrication, air source cleanliness, and operational stability, achieving a systematic improvement in overall machine performance.

Description

Technical Field

[0001] This invention relates to the field of air compressor technology, and more particularly to a novel water-lubricated screw air compressor. Background Technology

[0002] Water-lubricated screw air compressors, with their oil-free, clean, environmentally friendly, and highly adaptable characteristics, are widely used in fields such as food, pharmaceuticals, and precision manufacturing where high air purity is required, representing an important development direction in the air compressor industry. Their core actuator is the compressor head, mainly composed of a casing, male and female rotors, bearings, end covers, and a water-lubricated cooling system. Water is used to lubricate and cool the rotors, ensuring oil-free operation of the compression chamber.

[0003] Currently, traditional water-lubricated screw air compressor heads in the industry have many technical defects in terms of structural design, material selection, cooling and heat dissipation, and sealing and isolation, as detailed below: (1) When the traditional extrusion head housing is made of cast iron, the production cost is low, but the material has poor water corrosion resistance and is prone to rust and leakage during long-term operation. When stainless steel is used, although it has excellent corrosion resistance, the processing is difficult, the cost is high, and the production efficiency is low. Although aluminum alloy extrusion housing is low in cost and easy to process, it has the problem of weak tensile strength. There is no suitable fastening structure to make up for the shortcomings, and the overall structure stability is insufficient.

[0004] (2) Traditional machine head bearings are directly cooled by cooling water. The direct contact between the cooling water and the bearing can easily cause water pollution. At the same time, water vapor enters the bearing cavity, which will corrode the bearing and end cover and shorten the bearing life. Moreover, the water cooling heat dissipation efficiency is limited, and the bearing operating temperature is too high, which affects the overall machine operating efficiency.

[0005] (3) Traditional compressor heads do not have an independent sealing and isolation structure. The compression working chamber and the bearing mounting chamber are interconnected, and water vapor and compressed gas are easy to cross the chamber, which will not only aggravate the corrosion of components, but also pollute the compressed gas source, and cannot meet the requirements for clean gas use. Summary of the Invention

[0006] The present invention provides a novel water-lubricated screw air compressor to solve at least one of the technical problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides a novel water-lubricated screw air compressor, comprising: The main body of the casing has openings at both ends and is provided with an air inlet and an air outlet respectively; the wall panel of the main body of the casing is provided with an air inlet channel and an air return channel connecting the low-pressure area inside the main body of the casing. The front and rear partitions of the housing are respectively fastened to the openings at both ends of the main body of the housing, forming a sealed cavity with the main body of the housing; the front and rear partitions of the housing are provided with air holes that communicate with the air intake channel and the air return channel; The front cover and rear cover of the housing are respectively fastened to the outer sides of the front partition and the rear partition of the housing, and fixed to the main body of the housing. They respectively press the front partition and the rear partition of the housing into the inner side, forming an isolation heat dissipation cavity; the isolation heat dissipation cavity is connected to the air intake channel and the air return channel. The male and female rotors have their ends passing through the front partition and the rear partition of the housing, respectively, and are rotatably connected to the front end cover and the rear end cover of the housing at the corresponding ends by a rotating component; at least part of the sidewall of the rotating component is located inside the isolation and heat dissipation cavity.

[0008] Preferably, in the above-mentioned preferred embodiment of a novel water-lubricated screw air compressor, a shaft seal component is fitted at the position where the male and female rotors penetrate the front partition and the rear partition of the housing, thereby separating the inner cavity of the housing body and the isolation heat dissipation cavity into two independent areas.

[0009] Preferably, in the above-mentioned preferred embodiment of the novel water-lubricated screw air compressor, the wall panel of the housing body is provided with a pull rod channel; the front partition of the housing, the rear partition of the housing, the front end cover of the housing, and the rear end cover of the housing are all provided with pull rod holes that match the pull rod channel; The pull rod component passes sequentially through the pull rod holes of the front cover and the front partition of the housing, the pull rod channel of the main body of the housing, and the pull rod holes of the rear partition and the rear cover of the housing, and is locked and fixed at both ends by locking components.

[0010] Preferably, in the above-mentioned preferred embodiment of a novel water-lubricated screw air compressor, the main body of the casing is made of aluminum alloy by extrusion molding and undergoes surface anti-corrosion treatment; the front cover and the rear cover of the casing are both made of cast iron by casting molding.

[0011] Preferably, in the above-mentioned preferred embodiment of the novel water-lubricated screw air compressor, the air inlet is located at the top of the low-pressure zone of the main body of the casing; the outlet of the return air passage is located at the bottom of the low-pressure zone of the main body of the casing.

[0012] Preferably, in the above-mentioned preferred embodiment of the novel water-lubricated screw air compressor, the air intake channel is preset inside the top wall of the housing body, communicates with the hole wall of the air inlet, and extends towards the front partition and the rear partition of the housing respectively, and can communicate with the air holes of the front partition and the rear partition of the housing.

[0013] Preferably, in the above-mentioned preferred embodiment of a novel water-lubricated screw air compressor, the return air passage is located in the low-pressure zone and has a return air passage outlet facing the male and female rotors.

[0014] Preferably, in the above-mentioned preferred embodiment of the novel water-lubricated screw air compressor, a purge channel is also pre-set in the side wall of the main body of the casing. The purge channel is connected to the side wall of the air outlet and has an independent exhaust port.

[0015] Preferably, in the above-mentioned preferred embodiment of the novel water-lubricated screw air compressor, a cooling water cavity is further provided in the side wall of the main body of the casing. The cooling water cavity is provided with an inlet connected to an external water supply device and an outlet that penetrates the inner cavity of the main body of the casing and faces the male and female rotors.

[0016] Preferably, in the preferred embodiment of the above-mentioned novel water-lubricated screw air compressor, the air inlet is connected to an airflow supply device; A one-way valve is provided at the connection between the air inlet and the air supply device, and a one-way valve is provided at the connection between the air outlet and the downstream device; an electric regulating valve is provided at the exhaust port.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) External dry airflow enters the isolation heat dissipation cavity through the air intake channel, directly wrapping the rotating parts to achieve dry air cooling. After cooling, the airflow returns to the low-pressure area inside the main body of the casing through the return air channel, forming a closed-loop airflow circulation. This eliminates the traditional bearing water cooling method and completely avoids cooling water pollution. The continuous dry airflow efficiently removes heat from the rotating parts, significantly reducing the bearing operating temperature and improving the service life and operational stability of the rotating parts.

[0018] The top air intake and bottom air return are designed to match the natural airflow direction in the low-pressure zone, forming a dual air intake point. This optimizes the airflow circulation path and provides sufficient gas for the male and female rotors to be compressed, thereby improving the efficiency of air compression.

[0019] (2) The shaft seal component forms a physical sealing barrier, blocking the water vapor and compressed gas in the inner cavity of the housing from flowing into the dry airflow of the isolation heat dissipation cavity; preventing water vapor from entering the isolation heat dissipation cavity and corroding the rotating parts and end cover, and extending the service life of the end parts.

[0020] (3) Aluminum alloy extrusion molding is easy to process and low in cost, and the surface is easy to be treated with anti-corrosion; the cast iron end cap ensures the structural strength of the end, and the through tie rod bears the axial tension, directly avoiding the weakness of aluminum alloy in tensile strength. It greatly reduces the processing cost and manufacturing difficulty of the housing, and the aluminum alloy housing has excellent water corrosion resistance after surface treatment; the composite material takes into account lightweight, low cost and structural strength, and the through fastening improves the assembly rigidity and structural stability of the whole machine, which is suitable for long-term high-pressure operation conditions.

[0021] (4) When an independent airflow is introduced into the purging channel, the outlet and the inner cavity of the casing are purged to remove residual water vapor and impurities. The independent exhaust port realizes the directional discharge of purging exhaust gas. This effectively avoids the problem of water vapor residue in the inner cavity of the casing corroding the inner wall and internal structural components such as the male and female rotors, and ensures the purity of the airflow at the outlet. Independent purging and exhaust do not interfere with the main compression air circuit, improving the overall reliability of the machine operation.

[0022] (5) The air supply device provides a stable drying and purging airflow, and the electric regulating valve precisely controls the discharge path of the high-pressure gas and the purging gas, adapting to different operating conditions. It can ensure the dryness of the internal components of the main body of the machine, avoid the problem of rusting of components in humid environments, ensure the good durability of the device, and ensure product quality. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the external structure of a novel water-lubricated screw air compressor according to the present invention; Figure 2 This is a side view schematic diagram of a novel water-lubricated screw air compressor according to the present invention; Figure 3 This is a top view schematic diagram of a novel water-lubricated screw air compressor according to the present invention; Figure 4 yes Figure 3 Cross-sectional view in the CC direction; Figure 5 yes Figure 3 Cross-sectional view in the DD direction; Figure 6-7 These are cross-sectional views of the internal structure of a novel water-lubricated screw air compressor according to the present invention from different perspectives; Figure 8 This is a schematic diagram of the cooling water chamber in the main body of the casing of a novel water-lubricated screw air compressor according to the present invention.

[0025] Figure label: 1. Main body of the casing; 10. Air inlet; 11. Air outlet; 12. Air inlet channel; 120. Air inlet channel inlet; 130. Air return channel inlet; 131. Air return channel outlet; 14. Tie rod assembly; 15. Bolt; 16. Purge channel; 17. Exhaust port; 19. Cooling water chamber; 2. Front partition of the casing; 3. Rear partition of the casing; 4. Front cover of the casing; 40. Isolation and heat dissipation cavity; 5. Rear cover of the casing; 6. Male and female rotors; 7. Rotating parts; 8. Shaft seal assembly. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] The present invention provides the following embodiments. Example 1

[0030] This invention provides a novel water-lubricated screw air compressor, such as... Figures 1-8 As shown, a novel water-lubricated screw air compressor includes: a housing body 1, a front housing partition 2, a rear housing partition 3, a front housing cover 4, a rear housing cover 5, and male and female rotors 6.

[0031] Specifically, the main body 1 is a horizontally placed cylindrical shell with openings at both ends, and the top and bottom of the side wall of the main body 1 are respectively provided with an air inlet 10 and an air outlet 11; the air inlet 10 faces the low-pressure area of ​​the inner cavity of the main body 1, and the air outlet 11 corresponds to the high-pressure area of ​​the inner cavity of the main body 1; an air intake channel 12 and a return air channel connecting the low-pressure area of ​​the inner cavity of the main body 1 are formed in the wall panel of the main body 1.

[0032] Furthermore, the intake passage 12 is formed within the top wall of the housing body 1, communicating with the hole wall of the intake port 10, serving as the intake passage inlet 120, and extending to both ends, namely the direction of the front partition 2 and the rear partition 3 of the housing, with the extended ends forming intake passage outlets in the housing body 1; the return passage is formed within the bottom wall of the housing body 1, with its two ends forming return passage inlets 130 on the end faces of the housing body. The return passage is located in the low-pressure area and has return passage outlets facing the male and female rotors.

[0033] It is foreseeable that the intake channel 12 extends bidirectionally along the top wall to adapt to the front and rear partitions, while the return channel is arranged based on the bottom wall. The protrusion raises the return outlet to prevent liquid accumulation and blockage, and under the action of airflow, it can effectively prevent humid airflow from entering the return channel. All gas channels are integrated within the wall panel, without occupying the compression cavity. The built-in air passages in the wall panel can maximize the effective volume of the compression cavity and improve air compression efficiency. The air passage layout conforms to the airflow direction in the low-pressure area, improving the smoothness of airflow circulation. In the low-pressure area, an upper intake area and a lower intake area are formed. The symmetrical upper and lower intake can make the gas pressure more evenly distributed in the circumferential direction of the rotor, offsetting some of the radial imbalance force caused by gravity or unilateral airflow, thereby reducing the bearing load. The bottom intake port 10 generates a continuous upward airflow drag force. This force is like a "wind sweep," which re-entrains water into the airflow, atomizes it, and participates in circulation, ensuring both the water balance of the water lubrication system and the safety of the intake.

[0034] In fluid mechanics, the flow area is inversely proportional to the fluid resistance. The dual inlets (top and bottom) effectively increase the total intake cross-sectional area, reducing the airflow velocity entering the tooth grooves. Gas can more evenly fill the inter-tooth volume of the rotor axially and radially, reducing kinetic energy loss caused by turbulence and eddies; it also reduces pressure loss during intake, significantly increasing the total amount of gas intake per unit time, especially under high flow conditions; the protrusion structure completely prevents the return air passage from being blocked by liquid accumulation, ensuring a continuous and stable cooling airflow.

[0035] Specifically, the fastening surfaces of the front partition 2 and the rear partition 3 of the housing are provided with stepped structures that are adapted to the end face of the main body 1 of the housing, and are fastened to the open end faces at both ends of the main body 1 of the housing through the fastening surfaces, forming a sealed cavity with the main body 1 of the housing; both the front partition 2 and the rear partition 3 of the housing are provided with air holes that are adapted to the air intake channel outlet of the air intake channel 12 and the air return channel inlet 130 of the air return channel; the air holes can communicate with the air intake channel 12 and the air return channel.

[0036] It is foreseeable that the stepped structure enables precise positioning and assembly, the sealing gasket blocks air leakage from the cavity, and the air vents ensure uninterrupted air passage, thereby improving the airtightness of the inner cavity of the main body 1 of the casing, preventing compressed gas leakage, and ensuring compression efficiency; precise positioning reduces assembly difficulty and improves the overall assembly accuracy and efficiency.

[0037] Furthermore, to improve the sealing effect of the inner cavity of the main body 1, sealing gaskets are provided on the contact surfaces of the front partition 2 and the rear partition 3 of the housing with the main body 1.

[0038] Specifically, the mating surfaces of the front cover 4 and the rear cover 5 of the housing are provided with groove structures, and the groove structures connect the air intake channel 12 and the air return channel. When the front cover 4 and the rear cover 5 of the housing are respectively fastened to the outer sides of the front partition 2 and the rear partition 3 of the housing and fixed to the housing body 1, the front partition 2 and the rear partition 3 of the housing are pressed tightly to the inner side, and the isolation heat dissipation cavity 40 can be formed on both sides respectively; that is, the isolation heat dissipation cavity 40 connects the air intake channel 12 and the air return channel.

[0039] It is foreseeable that the grooved structure encloses an independent heat dissipation space. Dry airflow enters the isolation heat dissipation chamber 40 through the intake channel 12, and then flows back to the low-pressure area through the return channel, forming a closed-loop dry heat dissipation cycle. This achieves dry air cooling of the bearings, abandoning the traditional water cooling method and eliminating cooling water pollution; the closed-loop airflow circulation consumes no additional energy, improving the overall energy utilization rate of the machine.

[0040] Furthermore, the wall panel of the main body 1 of the housing is pre-set with multiple pull rod channels; the front partition 2, the rear partition 3, the front cover 4, and the rear cover 5 of the housing are all provided with pull rod holes that match the pull rod channels; the pull rod component 14 passes through the pull rod holes of the front cover 4 and the front partition 2 of the housing, the pull rod channels of the main body 1 of the housing, and the pull rod holes of the rear partition 3 and the rear cover 5 of the housing in sequence, and is locked and fixed at both ends by locking components.

[0041] Furthermore, multiple threaded holes are opened on the side walls at both ends of the main body 1 of the housing; the front partition 2 and the rear partition 3 of the housing are provided with through holes that match the threaded holes; the front cover 4 and the rear cover 5 of the housing are both provided with countersunk through holes that match the threaded holes. Bolts 15 can pass through the front cover 4 and the front partition 2 of the housing, and the rear cover 5 and the rear partition 3 of the housing, respectively, and tighten and fix the front cover 4 and the front partition 2, and the rear cover 5 and the rear partition 3 of the housing to the main body 1 of the housing, forming an auxiliary fixation.

[0042] It should be noted that a lock nut can be used as the locking component.

[0043] It is foreseeable that the through-rod bears the axial tensile force of the whole machine, the bolt 15 achieves local reinforcement, the double fixation improves the structural rigidity, avoids the shortcoming of weak tensile strength of aluminum alloy, and the rigidity of the whole machine assembly is greatly improved; there is no loosening or deformation under high pressure operation conditions, and the structural stability and operational safety are significantly improved.

[0044] Furthermore, the main body 1 of the casing is made of aluminum alloy through extrusion molding and undergoes surface anti-corrosion treatment, such as anodizing, electrophoretic coating, or spraying with a water-resistant corrosion-resistant coating, to enhance its water corrosion resistance and suitability for long-term use in water-lubricated environments. The front cover 4 and rear cover 5 of the casing are both made of cast iron through casting processes, such as sand casting. The front partition 2 and rear partition 3 of the casing can be made of aluminum alloy through extrusion molding or stainless steel, ensuring water corrosion resistance.

[0045] It is foreseeable that aluminum alloy casting is easy and inexpensive to process, and surface treatment significantly improves corrosion resistance, which can greatly reduce the manufacturing cost of the housing. Due to the excellent water corrosion resistance of the aluminum alloy housing, the service life of the whole machine can be extended; at the same time, the overall structural strength is ensured by the cast iron end caps.

[0046] The system employs a composite material combination of an extruded aluminum alloy shell and cast iron end caps, along with a double-fastening structure consisting of a through-type tie rod and 15 bolts. This design retains the advantages of aluminum alloy, such as easy processing, low cost, and water resistance after surface anti-corrosion treatment. Meanwhile, the cast iron end caps and high-strength tie rods compensate for the insufficient tensile strength of aluminum alloy, significantly reducing overall manufacturing and processing costs. Simultaneously, it significantly improves the shell structure strength, assembly rigidity, and operational sealing. By utilizing composite materials, it balances production costs, overall product strength, corrosion resistance, and durability, achieving a balance between low cost, lightweight design, and high strength. This allows the equipment to be adapted to high-pressure, continuous operation conditions for extended periods, effectively extending the overall service life of the machine.

[0047] Specifically, the male and female rotors 6 include a male rotor and a female rotor that mesh with each other. The two ends of the male rotor and the female rotor pass through the front partition 2 and the rear partition 3 of the housing, respectively, and are rotatably connected to the front end cover 4 and the rear end cover 5 of the housing at the corresponding ends through the rotating component 7. One end of the male rotor is the power end, which is used to connect to the power device. At least part of the side wall of the rotating component 7 is located in the isolation heat dissipation cavity 40, such as part of the inner side wall, outer side wall, or any other side wall of the rotating component 7. When gas enters the isolation heat dissipation cavity 40 and flows out, it can blow away and dissipate heat from the rotating component 7 exposed in the isolation heat dissipation cavity 40, and carry the heat out of the isolation heat dissipation cavity 40.

[0048] It should be noted that the rotating component 7 can be a self-lubricating bearing. The dry airflow continuously blows the rotating component 7 inside the isolation heat dissipation cavity 40, directly carrying away the operating heat. The self-lubricating bearing does not require an additional lubricating medium. This significantly reduces the operating temperature of the rotating component 7 and extends the service life of the bearing. The self-lubricating bearing avoids the contamination of the air source by the lubricating medium, making it suitable for high-purity air usage scenarios. The airflow supply device ensures a stable heat dissipation airflow and a continuous and reliable heat dissipation effect.

[0049] Furthermore, a shaft seal component 8, such as a shaft water seal component, is fitted onto the position where the male and female rotors 6 pass through the front partition 2 and the rear partition 3 of the housing, separating the inner cavity of the main body 1 and the heat dissipation cavity 40 into two independent areas.

[0050] It is foreseeable that the shaft seal component 8 forms a physical sealing barrier, blocking the flow of water vapor and gas in the compressed cavity and the dry airflow in the isolation heat dissipation cavity 40, preventing water vapor from entering the isolation heat dissipation cavity 40 and corroding the rotating parts 7 and the end cover, and extending the service life of the end parts; avoiding the dry airflow from contaminating the compressed air source, and ensuring the oil-free cleanliness of the compressed air.

[0051] Furthermore, the air inlet 10 is connected to an airflow supply device; It should be noted that the air supply device can be an existing air supply device, such as a fan, to continuously supply gas, ensure the air supply to the compressor, and at the same time ensure the heat dissipation effect of the rotating part 7.

[0052] It should be noted that the air compression process in this scheme is as follows: the power unit drives the male and female rotors 6 to continuously mesh and rotate; external air is sent into the air inlet 10 at the top of the main body 1 of the casing by the air supply device, part of which directly enters the low-pressure area of ​​the compression cavity, and the other part of the air enters the low-pressure area of ​​the compression cavity through the air intake channel → isolation heat dissipation cavity → return air channel; the rotor meshing performs volumetric compression of the air in the low-pressure area, and the air is pushed from the low-pressure area to the high-pressure area. After the compression is completed, high-pressure compressed air is output from the air outlet 11 at the bottom of the main body 1 of the casing.

[0053] The dry closed-loop cooling process of rotating component 7 is as follows: the dry airflow provided by the airflow supply device enters the isolation cooling cavity 40 inside the front and rear end covers through the air intake channel 12 on the top wall of the main body 1 and the matching air holes of the front and rear partitions; the dry airflow continuously blows the rotating component 7 (self-lubricating bearing) in the cavity, taking away the heat of bearing operation; the airflow after blowing flows back to the low-pressure area of ​​the compression cavity through the return air channel on the bottom wall of the main body 1 and the return air outlet of the bottom protrusion, forming a dry circulation cooling without water contact.

[0054] Compared to traditional solutions, the above-mentioned technical solution uses a housing body 1, front / rear housing partitions, and front / rear housing covers, all connected by a pull rod component 14 through a pull rod channel and corresponding pull rod holes. Both ends are secured with locking devices and bolts 15 for further fixation, forming a high-rigidity machine. A sealing gasket is placed between the front / rear housing partitions and the housing body 1 to ensure a sealed compression cavity. A shaft seal component 8 is fitted at the point where the male and female rotors 6 pass through the partitions, completely separating the compression cavity of the housing body 1 from the two end isolation and heat dissipation cavities 40, preventing moisture and airflow from entering the cavity. Simultaneously, the independent isolation and heat dissipation cavities 40 provide heat dissipation for the rotating components 7 while also providing new air intake points for the male and female rotors 6, improving air compression efficiency. Through integrated technical solutions including overall structural innovation, optimized material matching, integrated air circuit design, and sealing and isolation protection, this system comprehensively addresses industry pain points of traditional water-lubricated screw air compressors, such as high processing difficulty, high cost, easy corrosion and contamination of bearings, low heat dissipation efficiency, easy contamination of air source, and poor structural stability, from core dimensions such as manufacturing cost, structural strength, corrosion resistance, heat dissipation and lubrication, air source cleanliness, and operational stability, thereby achieving a systematic improvement in overall machine performance.

[0055] Example 2

[0056] Based on Example 1, such as Figure 6 As shown, a purge channel 16 is also pre-set in the side wall of the main body 1 of the housing. The purge channel 16 is connected to the side wall of the air outlet 11 and is provided with an independent exhaust port 17.

[0057] Furthermore, the bottom of the air outlet 11 is a flared opening, and a one-way valve is provided at the connection between the air inlet 10 and the upstream airflow supply device that supplies dry gas, and a one-way valve is provided at the connection between the air outlet 11 and the downstream device; an electric regulating valve is provided at the exhaust port 17.

[0058] Furthermore, the male and female rotors 6 can be made of materials such as aluminum alloy, cast iron, and titanium alloy. Compared with traditional stainless steel materials, this reduces the rotor weight, significantly lowers material costs and processing difficulty, reduces bearing load, and improves the stability and economy of the entire machine operation.

[0059] Compared to traditional solutions, when the device is finished and requires purging and drying, one-way valve one is opened, one-way valve two is closed, and the electric regulating valve of exhaust port 17 is opened simultaneously. Drying gas is blown in through air inlet 10. The drying gas directly or indirectly purifies the inner cavity of the main body 1 through the return air channel outlet 131, removing residual liquid water and moisture from the inner wall of the main body 1 and the surfaces of the male and female rotors 6 along the path of air outlet → purging channel → exhaust port. After purging, one-way valve one and the electric regulating valve are closed, ensuring that a dry and sealed cavity is formed inside the main body 1. This ensures that the internal rotors and other components remain dry for a long time, solving the problem of rust in humid environments. Therefore, even if rotor components with lower rust-resistant materials are selected, good durability can still be guaranteed, while further reducing the overall cost of the product and ensuring product quality.

[0060] Example 3

[0061] Based on Example 2, such as Figure 8 As shown, a cooling water chamber 19 is also pre-set in the side wall of the main body 1 of the housing. The cooling water chamber 19 is provided with an inlet for connecting to an external water supply device and an outlet that penetrates the inner cavity of the main body 1 of the housing and faces the male and female rotors 6.

[0062] Compared to traditional solutions, the above-mentioned technical solution directly lubricates and cools the rotor by directionally spraying cooling water through a cavity onto the rotor meshing parts. The cooling water is precisely applied to the working area, improving rotor lubrication and cooling efficiency; the independent cavity avoids cross-interference between water and air paths, prevents water source contamination, and ensures long-term stable water lubrication performance.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel water-lubricated screw air compressor, characterized in that, include: The main body of the casing has openings at both ends and is provided with an air inlet and an air outlet respectively; the wall panel of the main body of the casing is provided with an air inlet channel and an air return channel connecting the low-pressure area inside the main body of the casing. The front and rear partitions of the housing are respectively fastened to the openings at both ends of the main body of the housing, forming a sealed cavity with the main body of the housing; the front and rear partitions of the housing are provided with air holes that communicate with the air intake channel and the air return channel; The front cover and rear cover of the housing are respectively fastened to the outer sides of the front partition and the rear partition of the housing, and fixed to the main body of the housing, respectively pressing the front partition and the rear partition of the housing on the inner side, forming an isolation and heat dissipation cavity; The isolation and heat dissipation cavity is connected to the air intake channel and the air return channel; The male and female rotors have their ends passing through the front partition and the rear partition of the housing, respectively, and are rotatably connected to the front end cover and the rear end cover of the housing at the corresponding ends by a rotating component; at least part of the sidewall of the rotating component is located inside the isolation and heat dissipation cavity.

2. A novel water-lubricated screw air compressor according to claim 1, characterized in that, The male and female rotors are fitted with shaft seal components at the positions where they pass through the front partition and the rear partition of the housing, separating the inner cavity of the housing body from the heat dissipation cavity into two independent areas.

3. A novel water-lubricated screw air compressor according to claim 1, characterized in that, The wall panel of the main body of the housing is provided with a pull rod channel; the front partition of the housing, the rear partition of the housing, the front end cover of the housing and the rear end cover of the housing are all provided with pull rod holes that match the pull rod channel; The pull rod component passes sequentially through the pull rod holes of the front cover and the front partition of the housing, the pull rod channel of the main body of the housing, and the pull rod holes of the rear partition and the rear cover of the housing, and is locked and fixed at both ends by locking components.

4. A novel water-lubricated screw air compressor according to claim 3, characterized in that, The main body of the casing is made of aluminum alloy through extrusion molding and has undergone surface anti-corrosion treatment; the front cover and the rear cover of the casing are both made of cast iron through casting molding.

5. A novel water-lubricated screw air compressor according to claim 2, characterized in that, The air inlet is located at the top of the low-pressure zone of the main body of the housing; the outlet of the return air channel is located at the bottom of the low-pressure zone of the main body of the housing.

6. A novel water-lubricated screw air compressor according to claim 5, characterized in that, The air intake channel is pre-set inside the top wall of the main body of the housing, communicates with the hole wall of the air intake, and extends towards the front partition and the rear partition of the housing respectively, and can communicate with the air holes of the front partition and the rear partition of the housing.

7. A novel water-lubricated screw air compressor according to claim 6, characterized in that, The return air passage is located in the low-pressure area and has a return air passage outlet facing the male and female rotors.

8. A novel water-lubricated screw air compressor according to any one of claims 1-7, characterized in that, The main body of the casing is also provided with a purge channel in the side wall. The purge channel is connected to the side wall of the air outlet and has an independent exhaust port.

9. A novel water-lubricated screw air compressor according to claim 8, characterized in that, The side wall of the main body of the casing is also provided with a cooling water cavity. The cooling water cavity is provided with an inlet for connecting to an external water supply device and an outlet that runs through the inner cavity of the main body of the casing and faces the male and female rotors.

10. A novel water-lubricated screw air compressor according to claim 8, characterized in that, The air inlet is connected to an airflow supply device; A one-way valve is provided at the connection between the air inlet and the air supply device, and a one-way valve is provided at the connection between the air outlet and the downstream device; an electric regulating valve is provided at the exhaust port.

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