Pneumatic control cabinet

Abstract

The application provides a pneumatic control cabinet, which comprises a cabinet door and a cabinet body, the cabinet door is fixed to the cabinet body through a hinged mode, the cabinet body comprises an inner plate and an outer plate, a device mounting cavity is arranged in the inner plate, and a certain gap is arranged between the inner plate and the outer plate, so that a closed cavity is formed between the inner plate and the outer plate, and a liquid is arranged in the cavity. A thin layer of water can effectively block the sound outside, and after a small amount of sound waves successfully enter the liquid, the propagation process of the sound waves in the liquid will rapidly attenuate due to the viscosity and internal friction of the liquid, and the sound energy is converted into heat energy. The greater the density and viscosity of the liquid, the more significant the absorption effect. The inner plate and the outer plate are made of steel plates, so the sound needs to be transmitted from the air to the inner plate and then to the liquid. The density of the inner plate and the liquid is different, and the acoustic impedance is also different. Therefore, a part of the sound is bounced back and a part of the sound is absorbed by the liquid during the transmission process, and when the sound reaches the outer plate, the sound intensity is greatly reduced, that is, the sound insulation effect is good.

Description

Technical Field

[0001] This application relates to the field of pneumatic control technology, and in particular to a pneumatic control cabinet. Background Technology

[0002] Pneumatic actuators, unlike electric actuators, do not produce electrical sparks, making them widely used in explosion-proof applications. Furthermore, for the same volume and weight, pneumatic actuators (such as cylinders) can generate greater linear thrust or rotational torque than electric actuators. For simple linear reciprocating motion, the cost of a single cylinder, solenoid valve, and associated piping is typically far lower than a combination of a servo motor, driver, and precision lead screw. Compressed air itself is compressible, giving pneumatic systems a natural "flexibility." When the actuator encounters an obstacle or reaches the end of its stroke, the air can be compressed, acting as a buffer and preventing hard damage to the mechanism. Pneumatic control cabinets typically require numerous solenoid valves and magnetic switches, generating significant noise during pneumatic circuit control, especially with frequent changes in control. The repeated engagement and disengagement of electromagnets further increases the noise frequency. Since some control cabinets are located near offices, noise levels are a concern. Increasing the airtightness of the control cabinet can reduce noise, but it will decrease heat dissipation.

[0003] Chinese patent application CN216345452U, entitled "Pneumatic Control Cabinet," discloses a pneumatic control cabinet relating to the field of laser cutting technology. The cabinet includes a cabinet body with an oxygen inlet pipe connected to the lower end of its side wall for supplying laser combustion gas. Above the oxygen inlet pipe, the cabinet body is connected to a pressure regulating structure for supplying gas to pneumatic actuators. This pressure regulating structure includes an intermediate pipe, a first pressure reducing valve, a three-way pipe, a solenoid valve, an air inlet pipe, and a connecting pipe for the pneumatic actuators. The three-way pipe has an air inlet pipe and a first pressure reducing valve fixed to its ends, respectively. An intermediate pipe is fixedly connected between the first pressure reducing valve and the solenoid valve, and the solenoid valve is fixedly connected to the connecting pipe for the pneumatic actuators. Above the pressure regulating structure, the cabinet body has a cooling structure for cooling. Even though this control cabinet uses a solenoid valve for control, frequent switching can cause the solenoid valve to generate noise during operation. Utility Model Content

[0004] This application provides a pneumatic control cabinet to at least solve the problem of excessive noise in the prior art.

[0005] According to this application, a pneumatic control cabinet is provided, including a cabinet door and a cabinet body. The cabinet door is fixed to the cabinet body by a hinge. The cabinet body includes an inner panel and an outer panel. The inner panel has a device mounting cavity. There is a certain gap between the inner panel and the outer panel so that a sealed cavity is formed between the inner panel and the outer panel. The cavity contains liquid.

[0006] Compared with the prior art, the pneumatic control cabinet of this application has the following advantages: Liquids are excellent sound insulation media, typically far superior to gases (such as air). Both media have different acoustic impedances; air has very low acoustic impedance, while liquids have very high acoustic impedance (approximately 3600 times that of air). When sound attempts to travel from air to water, the vast majority of the sound wave energy (over 99.9%) fails to penetrate the water and is reflected back at the air-water interface. A thin layer of water can effectively block sound. Even if a small amount of sound waves successfully enters the liquid, its propagation is rapidly attenuated due to the liquid's viscosity and internal friction, converting sound energy into heat. The higher the density and viscosity of the liquid, the more significant this absorption effect. Since the inner and outer panels are made of steel, sound must travel from air to the inner panel, then to the liquid. The difference in density and acoustic impedance between the inner panel and the liquid causes some sound to be reflected and absorbed during transmission, resulting in a significant decrease in sound intensity by the time it reaches the outer panel, thus providing good sound insulation.

[0007] In one embodiment, the cabinet is equipped with an air inlet pipe, which is at least partially located within the cavity and in contact with the liquid. This allows for heat exchange using the liquid, reducing the temperature of the air inlet pipe. The air inlet pipe typically uses a compressor to supply high-pressure air, which causes the air temperature to rise. High temperatures can accelerate the aging of the sealing rubber. Therefore, cooling the air inlet pipe with liquid can improve the service life of the entire pneumatic system. In addition, a slide valve can be installed on the air inlet pipe to control the gas flow, facilitating control cabinet maintenance.

[0008] In one embodiment, the intake pipe is provided with a U-shaped section located inside the cavity, which allows for sufficient heat exchange, reduces the air temperature inside the cylinder and other components, and extends their service life. In one embodiment, the cabinet door is equipped with a sound insulation panel. The sound insulation panel has a hollow structure with a liquid cavity containing liquid. This design provides better sound insulation and also has a certain heat dissipation effect. In one embodiment, the cabinet is provided with an exhaust vent, and a filter block is provided inside the exhaust vent. An exhaust fan is provided inside the filter block. The filter block not only has a certain sound insulation effect, but also blocks and adsorbs dust, ensuring the cleanliness of the cabinet.

[0009] In one embodiment, the cabinet has multiple air inlet and outlet pipe mounting holes on its side, thus forming a relatively enclosed space with better sound insulation and noise reduction.

[0010] In one embodiment, a display screen and control buttons are provided on the front side of the cabinet door, which facilitates the control and observation of the pneumatic system operation.

[0011] In one embodiment, the device mounting cavity is equipped with a filter, a pressure reducing valve, and an oil mist lubricator. The air inlet pipe passes through the filter, the pressure reducing valve, and the oil mist lubricator in sequence. The filter can filter particulate matter and moisture in the air, the pressure reducing valve can adjust the air pressure to a suitable state, and the oil mist lubricator can provide lubrication for the system and extend the service life of the system.

[0012] In one embodiment, the device mounting cavity is equipped with a control switch, a solenoid valve, a thermometer, and a vacuum pressure gauge, which facilitates the control and monitoring of the control box operation. In one embodiment, an alarm light is provided above the cabinet so that an alarm can be triggered when the system is abnormal, thus making it convenient to observe the working status of the control box and the pneumatic system.

[0013] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0014] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0015] Figure 1 This paper shows a schematic diagram of the structure of the pneumatic control cabinet in the half-open state of Embodiment 1 of this application; Figure 2 This diagram shows the pneumatic control cabinet of Embodiment 1 of this application with the inner panel and sound insulation panel removed. Figure 3 A schematic diagram of the right side of the pneumatic control cabinet of Embodiment 1 of this application is shown; Figure 4 It shows Figure 3 Schematic diagram of half section at point AA; Figure 5 This shows a front view of the pneumatic control cabinet in the half-open state of Embodiment 1 of this application; Figure 6 It shows Figure 5 Schematic diagram of half section at point BB; Figure 7 A schematic diagram of the sound insulation panel structure of the pneumatic control cabinet in Embodiment 1 of this application is shown; Figure 8 A half-sectional schematic diagram of the pneumatic control cabinet of Embodiment 2 of this application is shown.

[0016] Explanation of the labels in the diagram: 1. Cabinet door; 2. Cabinet body; 3. Filter; 4. Pressure reducing valve; 5. Oil mist lubricator; 6. Control switch; 7. Solenoid valve; 8. Thermometer; 9. Vacuum pressure gauge; 10. Sound insulation panel; 11. Display screen; 12. Control button; 13. Emergency stop button; 14. Alarm light; 20. Component mounting cavity; 21. Inner panel; 22. Outer panel; 23. Cavity; 24. Left side; 25. Right side; 26. Bottom end; 27. Rear panel; 28. Top panel; 29. ​​Air inlet pipe; 30. U-shaped pipe section; 31. Exhaust vent; 32. Filter block; 33. Exhaust fan; 34. Mounting hole; 35. Rubber block; 36. Mounting beam; 37. Fins; 38. Air inlet; 39. Sealing strip. Detailed Implementation

[0017] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] like Figure 1 and Figure 2 As shown, a pneumatic control cabinet includes a cabinet door 1 and a cabinet body 2. The cabinet door 1 is fixed to the cabinet body 2 by a hinge. The cabinet body 2 includes an inner panel 21 and an outer panel 22. The inner panel 21 is provided with a device mounting cavity 20. There is a certain gap between the inner panel 21 and the outer panel 22 so that a sealed cavity 23 is formed between the inner panel 21 and the outer panel 22. The cavity 23 is filled with liquid.

[0019] Example 1: like Figure 1 and Figure 4 As shown, for ease of manufacturing, only the left side 24, right side 25, and lower end 26 of the cabinet 2 are equipped with inner panels 21, forming a U-shaped cavity 23. The rear side panel 27 and upper side panel 28 are equipped with shock-absorbing sponge pads or sound-absorbing rubber pads. The outer side of the outer panel 22 is equipped with fins 37 for heat dissipation. The front side of the cabinet 2 is equipped with a sealing strip 39 that matches the cabinet door 1 to ensure the sealing performance of the cabinet 2.

[0020] like Figure 2 , Figure 3 and Figure 4As shown, in one embodiment, the cabinet 2 is provided with an air inlet pipe 29, which is at least partially located within the cavity 23 and in contact with the liquid. A larger contact area between the air inlet pipe 29 and the liquid results in better heat exchange, but it also increases air resistance and reduces system efficiency. Therefore, a suitable length of the air inlet pipe 29 can be selected according to different pneumatic systems. Extending the length of the air inlet pipe 29 allows for heat exchange using the liquid, reducing the temperature of the air inlet pipe 29. The air inlet pipe 29 typically uses a compressor to supply high-pressure air. Compressing air causes the air temperature to rise, and high temperatures accelerate the aging of the sealing rubber. Therefore, cooling the air inlet pipe 29 with liquid can improve the service life of the entire pneumatic system. Additionally, a slide valve can be installed on the air inlet pipe 29 to control the gas flow, facilitating control cabinet maintenance.

[0021] The pneumatic control cabinet can be equipped with a negative pressure pipeline, but the negative pressure pipeline does not need to be heat exchanged. It can directly enter the cabinet 2 from the outside and connect to the control element. The control element is usually a solenoid valve, and there is no need to install other filters or other results.

[0022] like Figure 2 and Figure 6 As shown, in one embodiment, the intake pipe 29 is provided with a U-shaped pipe section 30, which is located inside the cavity 23. The U-shaped pipe section 30 has connectors at both ends for easy connection with other pipes, that is, the compressor pipes can be directly inserted into the cabinet 2 and connected to the U-shaped pipe section 30, and connected to other components through the U-shaped pipe section 30.

[0023] like Figure 1 and Figure 2 As shown, in one possible embodiment, the cabinet door 1 is provided with a sound insulation panel 10, such as... Figure 7 As shown, the sound insulation panel 10 has a hollow structure with a liquid cavity containing liquid, and the sound insulation panel 10 has multiple cable mounting holes 40. like Figure 1 , Figure 2 and Figure 4As shown, in one embodiment, the cabinet 2 is provided with an exhaust vent 31, a filter block 32 is provided inside the exhaust vent 31, and an exhaust fan 33 is provided inside the filter block 32. The filter block 32 is a sponge or other breathable foam structure, which can block dust and has a certain sound insulation effect. The filter block 32 is designed to be detachable or has an inspection panel, allowing for regular maintenance, cleaning or replacement of the filter media, as well as inspection or maintenance of the exhaust fan 33 as needed. This design facilitates regular maintenance and ensures continuous optimal ventilation performance. The exhaust fan 33 is an axial fan, which can provide the power for axial airflow, thus forming flowing air to reduce the temperature of the cabinet 2. When the ambient temperature is low, the temperature of the cabinet 2 can be directly dissipated through the outer surface, without causing malfunctions due to overheating. However, some workshop working environments are harsh, and the ambient temperature in summer may exceed 40°C, making it difficult for the cabinet 2 to dissipate heat and potentially causing other malfunctions. Therefore, a temperature sensor can be installed in the cabinet 2 to monitor the temperature. When the temperature of the cabinet 2 exceeds 55°C, the exhaust fan 33 can be activated for heat dissipation. Different activation temperatures can also be set for different usage environments. The cabinet 2 can be equipped with an air inlet 38, and a filter block 32 can be installed in the air inlet 38. An exhaust fan 33 can also be installed, but the air flow direction is opposite, that is, to deliver air into the cabinet 2.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the side of the cabinet 2 is provided with multiple air inlet pipes 29 and air outlet pipe mounting holes 34. The mounting holes 34 are set on the rubber block 35. The rubber block 35 has a thin area that can be pierced directly with a sharp object. That is, when the cabinet 2 is designed with different numbers of air inlet pipes 29 and air outlet pipes, the corresponding number of mounting holes 34 can be pierced. This can ensure that the inside of the cabinet 2 is cleaner and has a better sound insulation effect.

[0025] like Figure 3 As shown, in one possible embodiment, a display screen 11 and control buttons 12 are provided on the front side of the cabinet door 1. The display screen 11 monitors system parameters in real time, including air pressure, flow rate, and system status. The control buttons 12 are arranged in logical order next to the display screen and include at least an emergency stop button 13. The display screen 11 is a touch screen 11, which allows operators to adjust pressure settings, activate or deactivate the pneumatic system, and program or control it online for some equipment.

[0026] like Figure 1 , Figure 4 and Figure 5As shown, in one embodiment, the device mounting cavity 20 is provided with a mounting beam 36, which mounts a filter 3, a pressure reducing valve 4, and an oil mist lubricator 5. An air inlet pipe 29 passes sequentially through the filter 3, pressure reducing valve 4, and oil mist lubricator 5, and then connects to pneumatic control elements and pneumatic actuators. The control elements are mainly solenoid valves, and the actuators are cylinders and pneumatic motors. The filter 3 has a transparent cup body, allowing visual inspection of collected contaminants and indicating when maintenance is needed. The filter element is replaceable, made of sintered bronze, and can capture particles as small as 5 micrometers as needed. A manual drain valve at the bottom of the cup body allows for periodic removal of accumulated moisture and contaminants without disassembling the system.

[0027] The pressure reducing valve 4 uses an adjustable spring mechanism, allowing for a calibrated output pressure range of 15 to 120 psi. An integrated pressure gauge displays the current pressure value. The adjustment knob features a locking mechanism to prevent unexpected pressure changes during operation.

[0028] The oil mist lubricator 5 employs a precision needle valve system, allowing for fine adjustment of the amount of oil entering the airflow. The oil tank is transparent, facilitating visual monitoring of the lubricating oil level. The oil mist lubricator 5 operates based on the Venturi principle; the airflow passes through a narrow channel, creating a pressure difference that draws oil from the tank and introduces it into the airflow in the form of a fine mist.

[0029] Filter 3, pressure reducing valve 4 and oil mist lubricator 5 can be combined together to form a triple unit and installed and used simultaneously.

[0030] like Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, the device mounting cavity 20 is equipped with a control switch 6, a solenoid valve 7, a thermometer 8, and a vacuum pressure gauge 9. Electronic instruments are less stable than mechanical instruments; therefore, for more critical equipment, both electronic and mechanical instruments can be installed, and the instruments can be calibrated periodically. The control switch 6 can be a PLC-controlled relay or a manually operated switch.

[0031] like Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, an alarm light 14 is provided on top of the cabinet 2 to trigger an alarm in case of system malfunction. The alarm light 14 is securely fixed to the top of the cabinet 2 using mounting hardware, ensuring stability while allowing maintenance access when needed. The connection between the alarm light 14 and the cabinet 2 is designed to be weather-resistant and durable, capable of withstanding various environmental conditions while maintaining operational reliability.

[0032] Alarm light 14 is electrically connected to the monitoring circuitry of the system within the cabinet. This electrical connection enables alarm light 14 to receive signals from the system diagnostic components. When the monitoring circuitry detects abnormal operating conditions, a signal is transmitted to alarm light 14, activating its visual warning function.

[0033] The alarm light 14 uses a high-visibility lighting element that produces a bright, eye-catching light when activated. The light design ensures clear visibility, guaranteeing that operators or maintenance personnel will notice any abnormalities promptly, even in well-lit environments, regardless of ambient lighting conditions. The alarm light 14 can be used in conjunction with a horn, employing both light and sound to signal potential risks.

[0034] Example 2: like Figure 8 As shown, the inner panel 21 of the cabinet 2 forms a semi-enclosed device mounting cavity 20, which can be closed by the front cabinet door 1. There is no exhaust vent 31 or air inlet 38. The outer panel 22 is arranged around the outside of the inner panel 21. There is a certain gap between the inner panel 21 and the outer panel 22, so that a sealed cavity 23 is formed between the inner panel 21 and the outer panel 22. The cavity 23 contains liquid, which is water, and surrounds the inner panel 21 in five directions: top, bottom, left, right and back. In this way, the cabinet 2 has good thermal conductivity, and there is no need to set up an exhaust structure for heat dissipation. The sound insulation effect is also better. Fins 37 can be set on the outside of the outer panel 22 to increase the heat dissipation effect.

[0035] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description.

[0036] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pneumatic control cabinet, comprising a cabinet door (1) and a cabinet body (2), wherein the cabinet door (1) is fixed to the cabinet body (2) by a hinge, characterized in that: The cabinet (2) includes an inner panel (21) and an outer panel (22). The inner panel (21) has a device mounting cavity (20). There is a certain gap between the inner panel (21) and the outer panel (22) so that a closed cavity (23) is formed between the inner panel (21) and the outer panel (22). The cavity (23) contains liquid.

2. The pneumatic control cabinet according to claim 1, characterized in that: The cabinet (2) is provided with an air inlet pipe (29), which is at least partially located in the cavity (23) and in contact with the liquid.

3. The pneumatic control cabinet according to claim 2, characterized in that: The air intake pipe (29) is provided with a U-shaped pipe section (30), which is located inside the cavity (23).

4. The pneumatic control cabinet according to claim 2, characterized in that: The cabinet door (1) is provided with a sound insulation panel (10), which is a hollow structure with a liquid cavity, and the liquid cavity contains liquid.

5. The pneumatic control cabinet according to claim 2, characterized in that: The cabinet (2) is provided with an exhaust vent (31), and a filter block (32) is provided inside the exhaust vent (31), and an exhaust fan (33) is provided inside the filter block (32).

6. The pneumatic control cabinet according to any one of claims 2-5, characterized in that: The cabinet (2) has multiple mounting holes (34) for the air inlet pipe (29) and the air outlet pipe on its side.

7. The pneumatic control cabinet according to claim 6, characterized in that: The cabinet door (1) is equipped with a display screen (11) and control buttons (12) on the front side.

8. The pneumatic control cabinet according to claim 7, characterized in that: The device mounting cavity (20) is provided with a filter (3), a pressure reducing valve (4) and an oil mist lubricator (5), and the air inlet pipe (29) passes through the filter (3), the pressure reducing valve (4) and the oil mist lubricator (5) in sequence.

9. The pneumatic control cabinet according to claim 8, characterized in that: The device mounting cavity (20) is equipped with a control switch (6), a solenoid valve (7), a thermometer (8), and a vacuum pressure gauge (9).

10. The pneumatic control cabinet according to claim 9, characterized in that: An alarm light (14) is provided above the cabinet (2) so that an alarm can be issued when the system is abnormal.

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