A novel drain for oil-free screw systems

Abstract

This utility model relates to the technical field of oil-free screw systems, specifically to a novel drainage device for oil-free screw systems. The Airtac heavy-duty mechanical valve ZM3 (three-port, two-position) is used as the stroke control element, connected to a normally closed pneumatic shut-off valve via a first pipe, achieving pneumatic discharge control of condensate, avoiding high-frequency switching losses of electrically driven components. The float assembly rises and falls with the liquid level in the water tank, converting buoyancy into mechanical force through a rocker arm and slider mechanism, triggering the mechanical valve to open for drainage. A second pipe connects to a silencer, maintaining pressure balance inside and outside the water tank through an air vent balance hole. The normally closed pneumatic shut-off valve extends to the outside of the water tank, ensuring complete drainage of condensate and preventing backflow of compressed air, forming a liquid seal to ensure system energy efficiency. The entire device adopts a purely mechanical pneumatic structure, requiring no electrical components, utilizing the energy of compressed air itself to complete the drainage action, significantly reducing the failure rate and maintenance costs of solenoid valves.

Description

Technical Field

[0001] This utility model relates to the field of oil-free screw system technology, and in particular to a novel drainage device for oil-free screw systems. Background Technology

[0002] Oil-free screw air compressors have undergone years of development and are now widely used in industries such as food, pharmaceuticals, electronics and semiconductors, and textiles. Compared to centrifugal air compressors, oil-free screw air compressors offer high reliability with stable and efficient operation, relatively simple systems, convenient operation, and fewer vulnerable parts. With the addition of variable frequency control, they also offer high energy efficiency and versatility. However, due to the high temperature of oil-free screw systems, a shell-and-tube cooler with a high cooling water volume is required. After the compressed air is cooled in the shell-and-tube cooler, a significant amount of condensate is produced. A zero-air-consumption electromagnetic drainer should be used to remove this condensate from the system. Otherwise, excessive condensate will increase energy consumption in the oil-free screw system and affect the lifespan of the male and female rotors.

[0003] However, the air-distribution shell-and-tube cooler contains a lot of condensate, and the zero-air-consumption electromagnetic drain has a small water collection capacity. This will increase the switching frequency of the solenoid valve of the zero-air-consumption electromagnetic drain, which can easily cause the solenoid valve coil to burn out and water to enter the electromagnetic drain valve coil, making it easy to burn out. The zero-air-consumption electromagnetic drain will then become unusable, and replacing it will be expensive. Utility Model Content

[0004] The purpose of this utility model is to provide a novel drainage device for oil-free screw systems, aiming to solve the technical problems of existing gas separator shell-and-tube coolers having excessive condensate and small water collection capacity, which increases the switching frequency of the solenoid valve, easily causing the solenoid valve coil to burn out and the solenoid drain valve coil to become waterlogged and burn out; the zero-air-consumption electromagnetic drainer is unusable, and the cost of replacing the zero-air-consumption electromagnetic drainer is high.

[0005] To achieve the above objectives, this utility model employs a novel drainage device for an oil-free screw system, comprising a stroke control element and a water tank. The stroke control element has a first duct connected to its A end and a second duct connected to its R end. A rotary joint is provided at the rolling end of the stroke control element, and a rocker stroke valve arm is provided at the rotating end of the rotary joint. Multiple sliders are provided on the rocker stroke valve arm, and a float assembly is provided at the end of the rocker stroke valve arm away from the rotary joint. An air vent balance through-hole is provided on the water tank. The stroke control element is fixedly connected to the water tank and located on one inner side of the water tank.

[0006] The stroke control element is an Airtac heavy-duty mechanical valve, a three-port two-position ZM3.

[0007] Wherein, a normally closed pneumatic shut-off valve is provided at the end of the first Asia-Pacific pipe away from the stroke control element, and the normally closed pneumatic shut-off valve extends to the outside of the water tank.

[0008] The second Asia-Pacific pipe has a silencer at the end furthest from the stroke control element, and the silencer extends out of the other inner side of the water tank.

[0009] The rotation angle of the rolling end of the stroke control element is 0 to 75°, and the opening threshold of the stroke control element is 20N.

[0010] This invention discloses a novel drainage device for an oil-free screw system. The Airtac heavy-duty mechanical valve ZM3 (three-port, two-position) serves as the stroke control element, connected to a normally closed pneumatic shut-off valve via the first pipe, enabling pneumatic discharge control of condensate and avoiding high-frequency switching losses of electrically driven components. The float assembly rises and falls with the liquid level in the tank, converting buoyancy into mechanical force through the rocker arm and slider mechanism, triggering the mechanical valve to open for drainage. The second pipe connects to a silencer, reducing exhaust noise while maintaining pressure balance inside and outside the tank through the air vent balance hole. The normally closed pneumatic shut-off valve extends to the outside of the tank, ensuring complete drainage of condensate and preventing backflow of compressed air, forming a liquid seal to ensure system energy efficiency. The entire device employs a purely mechanical pneumatic structure, requiring no electrical components, utilizing the energy of compressed air itself to complete the drainage action, significantly reducing the failure rate and maintenance costs of solenoid valves. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a front view of the novel drainage device for an oil-free screw system according to this utility model.

[0013] Figure 2 This is the utility model Figure 1 A cross-sectional view along line AA in the middle.

[0014] Figure 3 This is an internal schematic diagram of the novel drainage device for an oil-free screw system according to this utility model.

[0015] 1-Stroke control element, 2-Float assembly, 3-Water tank body, 4-Normally closed pneumatic shut-off valve, 5-Slider, 6-Silencer, 7-Air vent balance through hole. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0017] Please see Figures 1 to 3 This utility model provides a novel drainage device for an oil-free screw system, including a stroke control element 1 and a water tank 3. The A end of the stroke control element 1 is connected to a first duct, and the R end of the stroke control element 1 is provided with a second duct. The rolling end of the stroke control element 1 is provided with a rotary joint, and the rotating end of the rotary joint is provided with a rocker stroke valve arm. The rocker stroke valve arm is provided with multiple sliders 5. The end of the rocker stroke valve arm away from the rotary joint is provided with a float assembly 2. The water tank 3 is provided with an air vent balance through hole 7. The stroke control element 1 is fixedly connected to the water tank 3 and is located on one inner side of the water tank 3.

[0018] In this embodiment, the buoyancy is converted into mechanical force by the liquid level sensing of the float assembly 2 to push the rocker stroke valve arm, triggering the stroke control element 1 to open the drainage, thus avoiding the high-frequency switching loss of the electric drive element. At the same time, the air vent balance through hole 7 maintains the pressure balance inside and outside the water tank, ensuring the stable operation of the drainage system. This purely mechanical structure significantly reduces the failure rate of the solenoid valve and extends the service life of the equipment.

[0019] Furthermore, the stroke control element 1 is an Airtac heavy-duty mechanical valve, a three-port two-position ZM3.

[0020] In this embodiment, when the condensate level rises, the float assembly 2 pushes the rocker arm of the mechanical valve by mechanical force, causing the valve body to open and releasing compressed air through the first air pipe, thereby driving the normally closed pneumatic shut-off valve 4 to open the drain outlet. This pneumatic control method requires no electricity and utilizes the system's own compressed air energy to achieve zero-air-consumption drainage, while avoiding the risk of the solenoid valve coil burning out.

[0021] Furthermore, a normally closed pneumatic shut-off valve 4 is provided at the end of the first Asia-Pacific pipe away from the stroke control element 1, and the normally closed pneumatic shut-off valve 4 extends to the outside of the water tank body 3.

[0022] In this embodiment, when the stroke control element 1 triggers drainage, compressed air passes through the first Asia-Pacific pipe to open the normally closed pneumatic shut-off valve 4. When the pressure inside the water tank 3 is greater than the external ambient pressure, the condensate is carried out of the system by the pressure difference. After drainage is completed, the valve automatically closes, forming a liquid seal by utilizing the liquid level difference to prevent compressed air leakage. This design ensures drainage efficiency and maintains stable system pressure, avoiding increased energy consumption and equipment wear caused by condensate accumulation.

[0023] Furthermore, a silencer 6 is provided at the end of the second Asia-Pacific pipe away from the stroke control element 1, and the silencer 6 extends out of the other inner side of the water tank body 3.

[0024] In this embodiment, when the stroke control element 1 discharges control gas through the second Asia-Pacific pipe, the silencer 6 reduces airflow vibration through a multi-stage diffuser structure, keeping the noise within a reasonable range. This design improves the equipment operating environment, avoids the impact of noise on operators, and enhances the overall system applicability.

[0025] Furthermore, the rotation angle of the rolling end of the stroke control element 1 is 0 to 75°, and the opening threshold of the stroke control element 1 is 20N.

[0026] In this embodiment, the rotation angle of the rolling end of the stroke control element 1 is designed to be 0–75°, and the opening threshold is set to 20N, ensuring the mechanical valve's sensitive response and stable control to changes in liquid level. When the float assembly 2 rises with the liquid level, it needs to overcome an opening force of 20N to push the rocker arm, avoiding malfunctions caused by slight fluctuations. The 75° rotation angle limits excessive valve opening, preventing waste of compressed air. This parameter optimization ensures drainage reliability, improves system energy efficiency, and extends the service life of the mechanical valve.

[0027] In this invention, the water tank 3 is installed below the drain outlet of the air-distribution shell-and-tube cooler, and the pressure inside and outside the water tank is maintained in balance through the air vent balance hole 7. When condensate in the cooler flows into the water tank 3, causing the liquid level to rise, the float assembly 2 floats with the liquid level. With the assistance of the slider 5, it smoothly pushes the rocker stroke valve arm, triggering the opening of the Airtac heavy-duty mechanical valve three-port two-position ZM3. At this time, compressed air passes through the first Asia Pacific pipe to open the normally closed pneumatic shut-off valve 4, discharging the condensate outside the system. After drainage is completed, the liquid level drops, causing the float assembly 2 to fall back. The mechanical valve releases control gas through the second Asia Pacific pipe to the silencer 6 for noise reduction before being discharged. At the same time, the normally closed pneumatic shut-off valve 4 automatically closes, using the remaining liquid level to form a liquid seal to prevent compressed air leakage. The entire process requires no electric drive, relying only on the system's own compressed air and mechanical structure linkage to achieve efficient, reliable, and zero-air-consumption condensate discharge.

[0028] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A novel drainage device for an oil-free screw system, characterized in that, The device includes a stroke control element and a water tank. The A end of the stroke control element is connected to a first Asia-Pacific pipe, and the R end of the stroke control element is provided with a second Asia-Pacific pipe. The rolling end of the stroke control element is provided with a rotary joint, and the rotating end of the rotary joint is provided with a rocker stroke valve arm. The rocker stroke valve arm is provided with multiple sliders, and the end of the rocker stroke valve arm away from the rotary joint is provided with a float assembly. The water tank is provided with an air vent balance through hole. The stroke control element is fixedly connected to the water tank and located on one inner side of the water tank.

2. The novel drainage device for an oil-free screw system as described in claim 1, characterized in that, The stroke control element is an Airtac heavy-duty mechanical valve, three-port two-position ZM3.

3. The novel drainage device for an oil-free screw system as described in claim 2, characterized in that, A normally closed pneumatic shut-off valve is provided at the end of the first Asia-Pacific pipe away from the stroke control element, and the normally closed pneumatic shut-off valve extends to the outside of the water tank.

4. The novel drainage device for an oil-free screw system as described in claim 3, characterized in that, A silencer is provided at the end of the second Asia-Pacific pipe away from the stroke control element, and the silencer extends out of the other inner side of the water tank.

5. The novel drainage device for an oil-free screw system as described in claim 4, characterized in that, The rotation angle of the rolling end of the stroke control element is 0 to 75°, and the opening threshold of the stroke control element is 20N.

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