A semi-automatic inflation and deflation system of heavy truck off-road motor home

Abstract

A kind of semi-automatic inflation and deflation system of heavy truck off-road motor home, it is related to motor home technical field, including the control branch and inflation branch of gas source separation, manual control device, relay valve, Y-shaped filter and pressure gauge in parallel at the output end of relay valve.The utility model discloses the double branch structure of control and air supply separation, improves system stability and response speed;Automatic inflation and deflation is realized without high pressure operation using relay valve, high safety and without electronic component, applicable to field no electricity environment;Check valve prevents gas backflow, guarantees pressure regulating accuracy and sealing reliability;Y-shaped filter effectively filters impurities, prolongs element life;Pressure gauge provides real-time tire pressure feedback, enhances monitorability and maintenance convenience, overall structure is simple, reliable, can flexibly adapt to the demand of different road conditions on tire ground pressure.

Description

Technical Field

[0001] This utility model relates to the field of RV technology, and in particular to a semi-automatic inflation and deflation system for a heavy-duty off-road RV. Background Technology

[0002] In the application scenarios of heavy-duty trucks and off-road RVs, traditional tire inflation and deflation systems have significant limitations and shortcomings. Early inflation and deflation systems mostly relied on manual operation, requiring operators to adjust tire pressure on-site according to different road conditions and needs. This was not only time-consuming and labor-intensive, but also prone to errors during adjustment, leading to tire damage or affecting vehicle driving safety. Furthermore, manual adjustment makes it difficult to precisely control tire pressure, especially in complex and varied off-road environments, such as deserts, muddy roads, and other low-traction surfaces, as well as paved roads and other hard surfaces. Different road conditions have drastically different requirements for tire contact pressure, posing challenges to driving experience and road safety.

[0003] While traditional electronic control systems offer a degree of automation, their complexity and heavy reliance on power supply make them unsuitable for use in remote or low-power environments. Electronic components are susceptible to harsh weather conditions (such as high temperatures, high humidity, and dust storms), increasing system failure rates and maintenance costs. Furthermore, the response speed and control precision of critical components like solenoid valves are limited by the stability and accuracy of electronic signals, resulting in poor performance in rapid response and precise control of high-pressure gases, failing to meet the demands of off-road RVs in extreme conditions.

[0004] Furthermore, existing integrated inflation / deflation systems often combine control and gas supply functions, which can easily lead to control signal fluctuations that interfere with the stability of the main gas supply. Therefore, there is an urgent market need for a semi-automatic inflation / deflation solution that can maintain high reliability while providing rapid response, precise control, and adaptability to various environmental conditions. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a semi-automatic inflation and deflation system for heavy-duty off-road RVs.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A semi-automatic inflation / deflation system for a heavy-duty off-road RV includes: The gas source is divided into two routes: one is the control branch, and the other is the filling branch. The manual control device has its air inlet connected to the corresponding control branch of the air source; The relay valve has its inlet connected to the inflation branch of the air source, and its control port connected to the outlet of the manual control device. The output pressure of the relay valve is controlled by the control branch. During inflation / deflation, the two output terminals of the relay valve are connected to the tires on the left and right sides of the heavy-duty off-road RV, respectively. When the tire pressure is higher than the output pressure of the relay valve, it automatically deflates through the pressure relief port of the relay valve, and vice versa.

[0007] Preferably, the manual control device includes: The three-way valve has its first port connected to the corresponding inflation branch of the gas source. The first pressure regulating valve is connected to the second port of the three-way valve at its inlet end; The second pressure regulating valve is connected to the third port of the three-way valve at its inlet end; The three-way valve has its first port connected to the outlet of the first pressure regulating valve, its second port connected to the outlet of the second pressure regulating valve, and its third port connected to the control port of the relay valve. The first pressure regulating valve and the second pressure regulating valve are used to preset the inflation pressure, respectively.

[0008] Preferably, both the first and second ports of the tee are equipped with one-way valves.

[0009] Preferably, the preset pressure of the first pressure regulating valve is 0.25±0.01MPa, and the preset pressure of the second pressure regulating valve is 0.6±0.01MPa.

[0010] Preferably, the gas source is divided into two paths by a Y-shaped filter.

[0011] Preferably, a pressure gauge is connected in parallel to the output end of the relay valve.

[0012] By adopting the technical solution described above, this utility model has the following beneficial effects: (1) This utility model has a simple structure. By separating the control function from the gas supply function into a dual-branch structure, the stability and response speed of the system are significantly improved. The system uses a gas storage tank equipped with a gas filling pump as a high-pressure gas source, ensuring that the gas supply to the system is both stable and reliable. In particular, since the control signal and the main gas supply channel are independent of each other, the influence of control signal fluctuations on the gas supply stability is avoided, making the entire system more precise and efficient in operation.

[0013] (2) This utility model utilizes the pilot control principle of a relay valve, allowing operators to complete the tire inflation or deflation process without directly handling high air pressure, greatly improving safety and ease of use. Furthermore, the system can achieve bidirectional pressure regulation without additional solenoid valves or electronic controllers, which not only simplifies the structure and reduces the failure rate but also makes it ideal for applications in environments without or with low electrical power. Therefore, whether facing soft sand or paved roads, this system can meet the optimal tire contact pressure requirements for different road conditions through simple mode switching, thereby improving vehicle passability and driving stability.

[0014] (3) To further improve the reliability and pressure regulation accuracy of the system, a check valve is installed on the pipeline between the tee and the two pressure regulating valves. This prevents gas from flowing back into the unused pressure regulating valves, avoiding problems such as pressure drift and sealing failure caused by reverse flow, while also enhancing the independence and stability of the output pressure of each pressure regulating valve. This improvement effectively ensures the overall control accuracy of the system and provides solid support for complex and ever-changing operating environments.

[0015] (4) By adding a Y-shaped filter at the air source outlet and installing a filter screen or filter element inside it, this utility model can effectively intercept oil and solid particulate impurities that may be carried in the compressed air, protecting the subsequent precision pneumatic components from damage and extending the service life of the system. At the same time, the pressure gauge connected in parallel at the output end of the relay valve can display the actual gas pressure delivered to the tire in real time, providing intuitive feedback for on-site operation, enhancing the system's monitorability and diagnosability, and making maintenance work simpler. Attached Figure Description

[0016] Figure 1 This is a simplified connection diagram of the present invention.

[0017] In the diagram: 1. Relay valve; 2. Three-way valve; 3. First pressure regulating valve; 4. Second pressure regulating valve; 5. Three-way valve; 6. Check valve; 7. Y-type filter; 8. Pressure gauge. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Example 1:

[0021] Combined with appendix Figure 1 A semi-automatic inflation / deflation system for a heavy-duty off-road RV includes an air source, a manual control device, and a relay valve 1. The air source is an air tank equipped with an air pump, with a storage pressure of not less than 1 MPa, providing a stable and reliable high-pressure air supply to the system. The air tank's outlet is divided into two branches: a control branch and an inflation branch. The control branch supplies control gas to the manual control device to adjust the output pressure of the relay valve 1; the inflation branch is directly connected to the air inlet of the relay valve 1, serving as the main air supply channel. This dual-branch structure separates the control function from the air supply function, effectively avoiding interference with the stability of the main air supply caused by control signal fluctuations, while improving the system's response speed and control accuracy.

[0022] The control branch is connected to the air inlet of the manual control device, the inflation branch is connected to the air inlet of relay valve 1, and the control port of relay valve 1 is connected to the air outlet of the manual control device. By applying a pressure regulating signal from the control branch to the control port of relay valve 1, the output pressure of relay valve 1 can be precisely set, thereby achieving automatic regulation of the tire inflation / deflation process. This design utilizes the pilot control principle of relay valve 1, enabling a large flow of gas to enter or exit the tire at a relatively low control pressure. This significantly reduces the operator's need for direct high-pressure control, improving the system's safety and ease of use.

[0023] During inflation or deflation, the two output terminals of relay valve 1 are connected to the left and right tires of the heavy-duty off-road RV, respectively. When the current tire pressure is higher than the set output pressure of relay valve 1, excess gas is automatically discharged through the pressure relief channel inside relay valve 1, achieving automatic deflation. Conversely, if the tire pressure is lower than the set value, relay valve 1 opens the inflation channel, allowing high-pressure gas to enter the tire from the inflation branch through relay valve 1, completing automatic inflation. This mechanism does not require additional solenoid valves or electronic controllers; it relies solely on pneumatic logic to achieve bidirectional pressure regulation. It features a simple structure, low failure rate, and is particularly suitable for use in heavy-duty off-road RVs in environments with no or weak electricity.

[0024] Specifically, the manual control device includes a three-way valve 2, a first pressure regulating valve 3, a second pressure regulating valve 4, and a three-way valve 5. The first port of the three-way valve 2 is connected to the gas supply's charging branch; the second port of the three-way valve 2 is connected to the air inlet of the first pressure regulating valve 3; and the third port of the three-way valve 2 is connected to the air inlet of the second pressure regulating valve 4. The three-way valve 2 has an L-shaped structure, meaning that during operation switching, only the first port and the second port, or the first port and the third port, can be connected simultaneously; simultaneous conduction of all three ports is not possible. This mechanical limiting design ensures that only a single pressure regulating valve is in operation at any given time, effectively preventing system malfunctions or pressure conflicts caused by two preset pressure signals being simultaneously input to the relay valve 1 due to misoperation, thus improving operational safety and logical clarity.

[0025] The first port of the three-way valve 5 is connected to the outlet of the first pressure regulating valve 3, the second port of the three-way valve 5 is connected to the outlet of the second pressure regulating valve 4, and the third port is connected to the control port of the relay valve 1. The first pressure regulating valve 3 and the second pressure regulating valve 4 are used to preset different inflation target pressures. For example, the preset pressure of the first pressure regulating valve 3 is 0.25 ± 0.01 MPa (2.5 kg), defined as "desert mode"; the preset pressure of the second pressure regulating valve 4 is 0.6 ± 0.01 MPa (6 kg), defined as "road mode". These two modes correspond to the optimal tire contact pressure under different road conditions: on soft sandy surfaces with low traction, lowering the tire pressure increases the tire contact area, improves passability, and reduces the risk of getting stuck; on paved roads and other hard surfaces, increasing the tire pressure reduces rolling resistance, tire wear, and improves driving stability. By pre-setting and mechanically locking the target pressure value, the operator only needs to switch the three-way valve 2 to complete the mode conversion, eliminating the need for on-site pressure parameter adjustment and simplifying the operation process.

[0026] When the heavy-duty off-road RV enters soft terrain such as deserts, the three-way valve 2 is switched so that its first and second ports are connected, i.e., it is connected to the first pressure regulating valve 3. At this time, the first pressure regulating valve 3 outputs a control air pressure of 0.25 MPa to the control port of the relay valve 1. The relay valve 1 then sets its output pressure to 2.5 kg. The two output ports of the relay valve 1 are connected to the left and right tires of the vehicle, respectively. If the current tire pressure is higher than 2.5 kg, the gas is automatically discharged through the pressure relief port of the relay valve 1 until the tire pressure drops to the set value. When the vehicle enters paved roads such as highways, the three-way valve 2 is switched so that its first and third ports are connected, i.e., it is connected to the second pressure regulating valve 4. The second pressure regulating valve 4 outputs a control air pressure of 0.6 MPa, and the relay valve 1 accordingly sets its output pressure to 6 kg and inflates the tires to this pressure value. The entire inflation and deflation process is automatically completed by the relay valve 1, without the need for manual intervention in deflation or continuous monitoring of inflation time, making it convenient and efficient. The system uses all pneumatic components and has no electronic parts involved in the core control. Therefore, it can maintain long-term reliable operation in harsh environments such as high temperature, high humidity, and sandstorms. It has low maintenance costs and strong adaptability.

[0027] It is important to note that the vehicle must be stationary when switching modes to avoid sudden changes in tire pressure on both sides during driving, which could affect vehicle handling stability or cause safety hazards. Example 2:

[0028] Combined with appendix Figure 1 A semi-automatic inflation / deflation system for a heavy-duty off-road RV differs from Embodiment 1 in that, in Embodiment 1, both the first and second ports of the three-way valve 5 are equipped with one-way valves 6. The one-way valves 6 are respectively installed on the pipeline between the outlet of the first pressure regulating valve 3 and the second pressure regulating valve 4 and the three-way valve 5, and their flow direction is set to allow gas to flow only from the pressure regulating valve to the three-way valve 5, prohibiting reverse flow. This design effectively avoids conflict between the control gas sources of 0.25MPa and 0.6MPa at both ends; and prevents gas from flowing back into the idle pressure regulating valve due to the higher output pressure of the other pressure regulating valve when one pressure regulating valve is not in use, thereby avoiding problems such as diaphragm deformation under pressure, pressure drift, or sealing failure in the pressure regulating valve. Simultaneously, the one-way valve 6 also blocks pressure fluctuations at the control port of the relay valve 1 from being transmitted back to the pressure regulating valve, further ensuring the independence and stability of the output pressure of each pressure regulating valve and improving the overall control accuracy of the system.

[0029] Furthermore, the air source is divided into two paths by a Y-shaped filter 7. The Y-shaped filter 7 is installed downstream of the air tank outlet and contains a filter screen or filter element to intercept oil and solid particulate impurities that may be carried in the compressed air. The filtered clean air then enters the control branch and the charging branch respectively, effectively preventing impurities from entering the pressure regulating valve, relay valve 1, and other precision pneumatic components, causing jamming, wear, or blockage, extending the system's service life, and ensuring consistent pneumatic response. In addition, the Y-shaped structure facilitates disassembly, cleaning, or filter element replacement, simplifying maintenance.

[0030] A pressure gauge 8 is connected in parallel to the output end of the relay valve 1. The pressure gauge 8 is connected to the output pipeline of the relay valve 1 via a three-way connector and is used to display the actual gas pressure being supplied to the tire in real time. By observing the reading of the pressure gauge 8, operators can intuitively determine whether the inflation / deflation is complete, whether there is a leak in the system, or whether the relay valve 1 is working properly, providing direct feedback for on-site operations and enhancing the system's monitorability and diagnosability.

[0031] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A semi-automatic inflation / deflation system for a heavy-duty off-road RV, characterized in that, include: The gas source is divided into two routes: one is the control branch, and the other is the filling branch. The manual control device has its air inlet connected to the corresponding control branch of the air source; The relay valve (1) has its air inlet connected to the inflation branch of the air source, and its control port connected to the air outlet of the manual control device. The output pressure of the relay valve (1) is controlled by the control branch. When inflating / deflating, the two output ends of the relay valve (1) are connected to the tires on the left and right sides of the heavy truck off-road RV respectively. When the tire pressure is higher than the output pressure of the relay valve (1), the tire pressure is automatically deflated through the pressure relief port of the relay valve (1), and vice versa.

2. The semi-automatic inflation / deflation system for heavy-duty off-road RVs as described in claim 1, characterized in that, The manual control device includes: The three-way valve (2) has its first port connected to the gas supply branch; The first pressure regulating valve (3) is connected to the second port of the three-way valve (2) at its inlet end; The second pressure regulating valve (4) is connected to the third port of the three-way valve (2) at its inlet end; The three-way valve (5) has its first port connected to the outlet of the first pressure regulating valve (3), its second port connected to the outlet of the second pressure regulating valve (4), and its third port connected to the control port of the relay valve (1). The first pressure regulating valve (3) and the second pressure regulating valve (4) are used to preset the inflation pressure respectively.

3. The semi-automatic inflation / deflation system for heavy-duty off-road RVs as described in claim 2, characterized in that: Both the first and second ports of the tee (5) are equipped with check valves (6).

4. The semi-automatic inflation / deflation system for heavy-duty off-road RVs as described in claim 2, characterized in that: The preset pressure of the first pressure regulating valve (3) is 0.25±0.01MPa, and the preset pressure of the second pressure regulating valve (4) is 0.6±0.01MPa.

5. The semi-automatic inflation / deflation system for heavy-duty off-road RVs as described in claim 1, characterized in that: The gas source is divided into two paths through a Y-shaped filter (7).

6. The semi-automatic inflation / deflation system for heavy-duty off-road RVs as described in claim 1, characterized in that: A pressure gauge (8) is connected in parallel to the output end of the relay valve (1).

Images