Intelligent pressure control air treatment unit

Abstract

The utility model relates to an intelligent pressure control air treatment unit which solves the problem that when air treatment is conducted on a heavy-duty commercial vehicle at present, water accumulation risks exist in an air storage cylinder in the high-temperature and high-humidity environment. Comprising an air dryer (12), a four-loop protection valve (13) and a pressure sensor (11), the air dryer (12) comprises an exhaust valve (1), a drying cylinder (2), a silencing exhaust valve (3), a heater (4), an air compressor unloading valve (5), a timing valve (6) and a one-way valve (7); the four-loop protection valve (13) comprises an overflow valve (8), a throttling one-way valve (9), a pressure limiting valve (10) and a pressure sensor (11). All functions of the device are relatively independent, modularization is achieved, the capacity of a brake cylinder can be reduced, overall arrangement is facilitated, graded safety control can be achieved, and cleanliness of a dryer molecular sieve is guaranteed.

Description

Technical Field

[0001] The utility model relates to an air processing system, in particular to an intelligent pressure-controlled air processing unit. Background Art

[0002] Currently, heavy-duty commercial vehicles utilize high-pressure air brakes. Throughout the air brake system, an air compressor supplies air to the vehicle's braking system. From the compressor, air flows through a dryer and is stored in an air tank. Before the air is stored in the tank, the dryer utilizes the adsorption properties of its internal molecular sieve to dry and filter out moisture and contaminants from the compressed air, providing dry, clean air for the subsequent braking system.

[0003] Heavy-duty commercial vehicles use compressed air from an air compressor to supply the brake system. If impurities such as water vapor in the compressed air are not treated, they can corrode the air brake system when converted to liquid water, causing failure. Currently, dryers are the primary method for treating compressed air. While effective, they cannot completely filter out moisture from the air path, and accumulated water and oil must be regularly drained, making their use quite inconvenient. The size of the gas cylinder is related to the dryer's cut-off pressure, particularly given the diverse chassis layouts of China VI emission vehicles. Short-wheelbase models offer compact space, increasing the capacity of the gas cylinder and compromising chassis space. The dryer utilizes a constant regeneration pressure drop. If the regeneration time is too short, the regeneration flow rate will exceed the molecular sieve's decomposition rate, impacting regeneration effectiveness. If pressure is lost during the regeneration process, regeneration will cease, allowing moisture to enter the system. This poses a risk of water accumulation in the air reservoir, especially in high-temperature and high-humidity environments. Utility Model Content

[0004] The utility model solves the problem of water accumulation risk in air storage cylinders of current heavy commercial vehicles during air treatment in high temperature and high humidity environments by providing an air processing unit with intelligent pressure control.

[0005] The utility model is realized by the following technical solutions:

[0006] An intelligent pressure-controlled air handling unit includes an air dryer 12, a four-circuit protection valve 13, and a pressure sensor 11; the air dryer 12 includes an exhaust valve 1, a drying cylinder 2, a silencer exhaust valve 3, a heater 4, an air compressor unloading valve 5, a timing valve 6, and a one-way valve 7; the four-circuit protection valve 13 includes a relief valve 8, a throttling one-way valve 9, a pressure limiting valve 10, and a pressure sensor 11;

[0007] The exhaust gas from the engine air compressor enters the air dryer 12 through the exhaust valve 1. The exhaust valve 1 is connected to the air inlet of the drying cylinder 2 and the air inlet of the silencer exhaust valve 3. The air outlet of the silencer exhaust valve 3 is connected to the heater 4. The air outlet of the drying cylinder 2 is connected to the air inlet of the timing valve 6. The air outlet of the timing valve 6 is connected to the air inlet of the four-circuit protection valve 13 and the air inlet of the air compressor unloading valve 5. The air outlet of the air compressor unloading valve 5 is connected to the control port 4 of the air compressor through a nylon tube. 23. Pressure sensor 11 is connected to outlets 21 and 22 of four-circuit protection valve 13. The air inlet of four-circuit protection valve 13 is connected to the air inlet of relief valve 8. The air outlet of relief valve 8 is connected to the air inlet of throttling check valve 9 and the air inlet of check valve 7. The air outlet of check valve 7 is connected to the air inlet of pressure-limiting valve 10. The air outlet of pressure-limiting valve 10 is connected to the air inlet of relief valve 8. The air outlet of relief valve 8 is connected to ports 23 and 24 of four-circuit protection valve 13. The four air outlets of the four-circuit protection valve are independently distributed to each circuit through nylon tubes.

[0008] This intelligent pressure-controlled air handling unit (AHU) integrates an air dryer, a four-circuit protection valve, and a pressure-limiting valve. These valves are independently replaceable and offer a wide range of optional features. Each function is relatively independent, achieving modularity. The AHU's cutoff pressure is increased to 12.5 MPa, reducing brake cylinder capacity and facilitating overall layout. Dividing the brake air circuit into multiple circuits enables graded safety control, and the dryer achieves over 95% oil filtration. A constant regeneration volume ensures regeneration efficiency, even with pressure loss during the regeneration process, ensuring the cleanliness of the dryer's molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the principle diagram of the intelligent pressure control air handling unit of the utility model, among which: 1: exhaust valve, 2: drying cylinder, 3: silencer exhaust valve, 4: heater, 5: air compressor unloading valve, 6: timing valve, 7: check valve, 8: overflow valve, 9: throttling check valve, 10: pressure limiting valve, 11: pressure sensor, 12: air dryer, 13: four-circuit protection valve. DETAILED DESCRIPTION

[0010] The utility model intelligent pressure control air processing unit consists of an air dryer 12, a four-circuit protection valve 13, and a pressure sensor 11. The air dryer 12 consists of an exhaust valve 1, a drying cylinder 2, a silencer exhaust valve 3, a heater 4, an air compressor unloading valve 5, a timing valve 6, and a one-way valve 7; the four-circuit protection valve 13 consists of a relief valve 8, a throttling one-way valve 9, a pressure limiting valve 10, and a pressure sensor 11. The principle is as follows: Figure 1 shown.

[0011] The exhaust gas from the engine air compressor enters the air dryer 12 through the exhaust valve 1. The exhaust valve 1 is connected to the air inlet of the drying cylinder 2 and the air inlet of the silencer exhaust valve 3. The air outlet of the silencer exhaust valve 3 is connected to the heater 4. The air outlet of the drying cylinder 2 is connected to the air inlet of the timing valve 6. The air outlet of the timing valve 6 is connected to the air inlet of the four-circuit protection valve 13 and the air inlet of the air compressor unloading valve 5. The air outlet of the air compressor unloading valve 5 is connected to the control port 4 of the air compressor through a nylon tube. 23. Pressure sensor 11 is connected to outlets 21 and 22 of four-circuit protection valve 13. The air inlet of four-circuit protection valve 13 is connected to the air inlet of relief valve 8. The air outlet of relief valve 8 is connected to the air inlet of throttling check valve 9 and the air inlet of check valve 7. The air outlet of check valve 7 is connected to the air inlet of pressure-limiting valve 10. The air outlet of pressure-limiting valve 10 is connected to the air inlet of relief valve 8. The air outlet of relief valve 8 is connected to ports 23 and 24 of four-circuit protection valve 13. The four air outlets of the four-circuit protection valve are independently distributed to each circuit through nylon tubes.

[0012] In order to realize intelligent pressure control on the vehicle, the utility model improves the original gas circuit principle. The specific scheme is as follows: the original connecting gas circuit is retained (see the gas circuit principle diagram for details), and an additional Figure 1 As shown in the dotted line area, the gas circuit principle is to add a timing valve 6 between the drying cylinder 2 and the four-circuit protection valve 13, add a pressure sensor 11 at the gas outlets 21 and 22 of the four-circuit protection valve 13, and add a pressure limiting valve 10 between the one-way valve 7 and the relief valve 8.

[0013] Highly integrated and modular components: The air dryer 12, four-circuit protection valve 13, and pressure-limiting valve 10 are integrated into one unit, eliminating the need for additional piping, connectors, or brackets, helping to shorten brake response time. A wide range of optional features are available, each relatively independent and modular. The air handling unit is also divided into three independently replaceable sections, reducing maintenance costs. The brake circuits are inflated via 12 external air sources, or the vehicle's tires are inflated using high-pressure air from the brake system. A pressure sensor measures the main brake circuit pressure, eliminating the need for additional sensors and connectors in other locations on the brake harness.

[0014] Safety pressure increases: The air handling unit's cutoff pressure is raised to 12.5 MPa. Once the system reaches this pressure, the compressor unloading valve 5 receives a signal, which is fed back to the compressor via control port 4 / 23. The compressor stops pumping and reduces engine load. Gas cylinders are used to store clean air after being processed by the air handling unit. The cylinder volume is related to the dryer's cutoff pressure. This is especially true for China VI vehicles, which have a wide variety of chassis layouts. Furthermore, optional features required by different markets (such as air suspension and retarders) require additional gas cylinders. This increased system pressure can reduce the cylinder volume and facilitate overall layout.

[0015] Hierarchical safety control: The brake air circuit is divided into multiple loops. The four-circuit protection valve 13 ensures that other circuits can continue to operate normally even if one circuit fails. The parking brake is still in effect before the main brake circuit is activated. If the main brake circuit leaks, the parking brake automatically activates. The air compressor unloading valve 5 limits the maximum pressure in the brake circuit. The pressure-limiting valve 10 implements multi-level pressure output within the brake air circuit principle.

[0016] Oil filtering function: Optional more advanced drying cylinder can filter the oil entering the brake air circuit from the air compressor to avoid contamination of the drying tank and the brake system. The drying cylinder can achieve an oil filtering effect of more than 95%.

[0017] Constant regeneration volume: The regeneration volume is derived from the volume of the air reservoir connected to each port of the four-circuit protection valve during inflation. When it finally passes through port 1 of the four-circuit circuit to port 21 of the dryer, the timing valve opens, and compressed air from the air handling unit outlet flows back through the molecular sieve in the dryer cartridge 2, flushing away the moisture within. The regenerated oil and water are then backflushed out of exhaust port 3, thus performing the regeneration function. When the backflow time is reached, the timing valve de-energizes, stopping the backflow. This constant regeneration volume protects the molecular sieve in the dryer cartridge from oil immersion, thereby extending the dryer cartridge's service life.

[0018] This new utility model integrates an air dryer, a four-circuit protection valve, and a pressure-limiting valve for simple and convenient installation, eliminating the need for additional piping, connectors, or brackets. The air handling unit's cutoff pressure is increased to 12.5 MPa, reducing brake cylinder capacity, optimizing space layout, improving chassis space utilization, and reducing vehicle weight. It also accelerates pressure buildup in some pipelines, helping to shorten brake response time. The timed regeneration structure and constant regeneration volume ensure that even with pressure loss during the regeneration process, regeneration efficiency is maintained, ensuring the cleanliness of the dryer's molecular sieve.

Claims

1. An intelligent pressure-controlled air handling unit, characterized by: The air dryer (12) comprises an air dryer (12), a four-circuit protection valve (13) and a pressure sensor (11); the air dryer (12) comprises an exhaust valve (1), a drying cylinder (2), a silencer exhaust valve (3), a heater (4), an air compressor unloading valve (5), a timing valve (6) and a one-way valve (7); the four-circuit protection valve (13) comprises a relief valve (8), a throttling one-way valve (9), a pressure limiting valve (10) and a pressure sensor (11); The exhaust gas from the engine air compressor enters the air dryer (12) through the exhaust valve (1). The exhaust valve (1) is connected to the air inlet of the drying cylinder (2) and the air inlet of the silencer exhaust valve (3). The air outlet of the silencer exhaust valve (3) is connected to the heater (4). The air outlet of the drying cylinder (2) is connected to the air inlet of the timing valve (6). The air outlet of the timing valve (6) is connected to the air inlet of the four-circuit protection valve (13) and the air inlet of the air compressor unloading valve (5). The air outlet of the air compressor unloading valve (5) is connected to the control port 4 / 23 of the air compressor. The pressure sensor (11) is connected to the The air outlets 21 and 22 of the four-circuit protection valve (13), the air inlet of the four-circuit protection valve (13) are connected to the air inlet of the overflow valve (8), the air outlet of the overflow valve (8) is connected to the air inlet of the throttling check valve (9) and the air inlet of the check valve (7), the air outlet of the check valve (7) is connected to the air inlet of the pressure limiting valve (10), the air outlet of the pressure limiting valve (10) is connected to the air inlet of the overflow valve (8), the air outlet of the overflow valve (8) is connected to the air inlet 23 and 24 of the four-circuit protection valve (13), and the four air outlets of the four-circuit protection valve are independently allocated to each circuit.

2. The intelligent pressure-controlled air handling unit according to claim 1, characterized in that: The air outlet of the air compressor unloading valve (5) is connected to the control port 4 / 23 of the air compressor through a nylon tube.

3. The intelligent pressure-controlled air handling unit according to claim 1, characterized in that: The four air outlets of the four-circuit protection valve are independently distributed to each circuit through nylon tubes.

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