Purification valves, air dryers, pressurized air-based systems, and commercial vehicles

Abstract

This invention relates to a purification valve, an air drying device, a pressurized air-based system, and a commercial vehicle. The purification valve (100) with integrated safety features is suitable for an air drying device. In the purification valve, a purification valve body (102) forms a first exhaust passage (104) for connecting an inlet line (101) to an outlet line (103). A purification valve piston (108) is arranged within the purification valve body to control the exhaust flow through the first exhaust passage upon receiving a purification signal (S). The purification valve piston includes a through opening (110) configured to form a second exhaust passage (112) for connecting the inlet line to the outlet line. A valve member (114) is arranged in the through opening and configured to control the exhaust flow through the second exhaust passage (112). The valve member is configured to be actuated by pressurized air when the pressure in the inlet line exceeds a threshold actuation pressure.

Description

Technical Field

[0001] This invention relates to a purification valve. It also relates to air drying devices and pressurized air-based systems, as well as commercial vehicles. Background Technology

[0002] This purification valve for an air drying device includes: a purification valve body forming a first exhaust passage for connecting an inlet line to an outlet line, the outlet line being connected to the outside of the purification valve; wherein a purification valve piston is arranged within the purification valve body to control the exhaust flow from the inlet line through the first exhaust passage to the outlet line; wherein the purification valve piston can be actuated upon receiving a purification signal.

[0003] US 6,730,143 B1 essentially describes a purifying valve as mentioned in the introduction. The purifying valve described therein is part of an air dryer in which desiccant material periodically purifies its moisture through a reverse purifying flow of air. The purifying valve is configured to open a purifying air exhaust port in communication with the environment.

[0004] Furthermore, in the field of air dryers without dedicated safety valves, it is generally known that a purge valve can be arranged to further operate as a safety valve. For purge, a regeneration or solenoid valve provides an air signal that causes air pressure to overcome the spring force and open the purge valve. In addition to its operation during the purge phase described above, overpressure from the main chamber of the air dryer overcomes the same spring force on a smaller area of ​​the piston. The balance between the two piston surfaces is designed to ensure proper sealing and full opening during the regeneration phase (also known as the purge phase). Typically, the opening pressure of the purge valve piston, used as a safety valve, must be set much higher than the shut-off pressure (usually 4 bar higher) to protect the purge valve from leakage during normal vehicle operation. Simultaneously, it ensures the tightness of the air dryer by taking into account the spring's relaxation over its service life. Such a high difference between the maximum operating pressure and the safety function opening pressure reduces the likelihood of using an integrated safety valve, especially when there is no significant difference between the expected shut-off / maximum operating pressure and the safety valve opening pressure.

[0005] The safety of pressurized air-based systems and their users is a critical aspect. According to the Pressure Equipment Directive 97 / 23 / EC (PED), particularly Section 2.10, "Protection against exceeding the allowable limits of pressure equipment," where permissible limits may be exceeded under reasonably foreseeable conditions, the pressure equipment must be fitted with suitable protective devices or prepared for such devices, unless the equipment is expected to be protected by other protective devices within the assembly. Suitable devices or combinations thereof must be determined based on the specific characteristics of the equipment or assembly. Suitable protective devices and combinations thereof include: (a) safety accessories as defined in Section 2.1.3, Clause 1; and (b) where appropriate, suitable monitoring devices, such as indicators and / or alarms, capable of taking appropriate action, automatically or manually, to keep the pressure equipment within its permissible limits.

[0006] Furthermore, according to the Pressure Equipment Directive PED 2014 / 68 / EU, safety accessories are devices designed to protect pressure equipment from exceeding permissible limits (pressure, temperature, water level, etc.). The suitability of a device or combination of devices is determined based on the specific characteristics of the equipment or component. For example, a combination of a level gauge and a pressure reducing system.

[0007] It would be beneficial to provide an integrated safety valve to the purge valve, which has a weaker purge function and the ability to operate with a small pressure difference between the maximum operating pressure and the opening pressure of the safety valve. Summary of the Invention

[0008] This objective is advantageously achieved by a purging valve according to a first aspect of the invention. The purging valve is particularly suitable for air drying devices. The purging valve includes a purging valve body forming a first exhaust passage for connecting an inlet line to an outlet line connected to the outside of the purging valve. The purging valve includes a purging valve piston disposed within the purging valve body and configured to control the exhaust flow from the inlet line through the first exhaust passage to the outlet line. The purging valve piston is actuated upon receiving a purging signal.

[0009] The purge valve piston also includes a through opening configured to form a second exhaust passage for connecting the inlet line to the outlet line. The second exhaust passage is separate from the first exhaust passage. Furthermore, a valve member is arranged within the through opening. The valve member is configured to control the exhaust flow through the second exhaust passage. The valve member is arranged and configured to be actuated by pressurized air when the pressure of the pressurized air in the inlet line exceeds a predetermined threshold actuation pressure.

[0010] In the purification valve according to the invention, a second exhaust passage is provided, similar to the first exhaust passage, connecting the inlet line to the outlet line. The second exhaust passage is formed by a through-opening in the purification valve piston. Upon receiving a purification signal, the purification valve piston controls the exhaust flow through the first exhaust passage. A valve member is configured to control the exhaust flow via the second exhaust passage, located in the through-opening, which is arranged and configured to bypass the valve seat of the purification valve, i.e., the position where the purification valve piston, cooperating with the purification valve body in the closed state, closes the first exhaust passage. By providing an independently controllable second exhaust passage, the difference between the maximum operating pressure during normal purification operation and the opening pressure of the valve member acting as a safety valve in the event of overpressure can be reduced.

[0011] The development of the purification valve of the first aspect of the present invention will be described below.

[0012] In a preferred development, the valve component includes a valve body formed by a purge valve piston.

[0013] In another development, the valve member arranged in the through opening includes a valve piston configured to be actuated against the spring force of a valve spring element. Preferably, the valve spring element is also arranged within the through opening of the purge valve piston.

[0014] In one particular development, the valve component also includes an adjusting nut, preferably fully or at least partially arranged within the through opening. The adjusting nut has a generally cylindrical shape and includes an annular recess for receiving a valve spring element. It also includes a central recess arranged and configured to receive a piston rod attached to the valve piston. This provides guidance and stability for the various elements of the valve component. Furthermore, the opening pressure of the integrated valve component can be set by the spring force adjusted by the adjusting nut.

[0015] In another development of the purge valve in the first aspect, it may include any of the features discussed above, wherein the purge valve piston includes at least one air passage window disposed on the peripheral wall of the purge valve piston and configured as an air inlet of a second exhaust passage. Thus, the air passage window is connected to an upstream inlet line and a downstream through opening and outlet line, and is configured as an air inlet portion of the through opening upstream of the valve member, which controls the flow through the second exhaust passage.

[0016] In another development, the purge valve body includes at least one inlet window disposed on the peripheral wall of the purge valve body and configured as an air inlet for a first exhaust passage. Preferably, the air passage window and the inlet window are arranged such that, in the closed state of the purge valve, the distance between the purge valve seat controlling the flow through the first exhaust passage and the inlet window is less than the distance between the purge valve seat and the air passage window in the purge valve piston. In this particular development, the position of the inlet air passage window is arranged to be higher than the position of the inlet window during operation, thereby avoiding possible oil particle and moisture contamination at the valve components.

[0017] In another development, the receipt of a purge signal triggers the supply of pressurized air, which applies pressure to the distal end of the purge valve piston. This causes the purge valve piston to overcome the spring force of the purge valve spring element, thereby opening the first exhaust passage. Because the purge valve spring element differs from the valve spring element of the valve component, in developments including two spring elements, different opening pressures can be set independently, resulting in a small pressure difference between the maximum operating pressure of the purge valve and the opening pressure of the valve component, which is specifically used as a safety valve.

[0018] The object of the present invention is also achieved by an air drying apparatus according to a second aspect of the invention. This air drying apparatus is particularly suitable for drying air in pressurized air-based systems, especially commercial vehicles. The air drying apparatus includes an inlet unit for receiving air from an air supply unit of a pressurized air-based system. It also includes an outlet unit for supplying dry air to a dry air reservoir of the pressurized air-based system. Furthermore, the air drying apparatus includes a drying unit comprising a first port connected to the inlet unit, a second port connected to the outlet unit, and a drying chamber disposed between the first and second ports and comprising a desiccant material. A purification unit is connected to the first port, wherein the purification unit includes a purification valve according to a first aspect of the invention. The inlet line of the purification valve is connected to the first port. Therefore, the purification valve is arranged and configured to control the exhaust flow from the inlet line through a first exhaust passage and a second exhaust passage to the outlet line. When a purification signal is received, the first exhaust passage opens, and when the pressure of the pressurized air in the inlet line exceeds a threshold actuation pressure, the second exhaust passage opens.

[0019] The air drying device of the second aspect of the present invention has the advantages of the purification valve of the first aspect.

[0020] The development of air drying equipment will be described below.

[0021] In one particular development, the drying unit is configured to operate in both an inflation mode and a regeneration mode. In inflation mode, the drying unit is configured to receive air through a first port, dry the received air, and supply dry air to an outlet unit through a second port. In regeneration mode, the drying unit is configured to receive dry air through the second port and supply exhaust air through the first port. Typically, the drying unit includes an air dryer cartridge, and the dry air used in the regeneration phase is typically supplied by a dry air reservoir. In a particular embodiment, the drying unit includes a dual air cartridge having two units. During operation, one of these units operates in the inflation phase and supplies dry air to the dry air reservoir and the remaining unit, which then operates in the regeneration phase. After a predetermined time, the operation of the second unit switches to the inflation phase, and the operation of the first unit switches to the regeneration phase.

[0022] In another development, the air drying device also includes a safety valve connected to the inlet unit and configured to allow airflow to the outside when the pressure within the air drying device exceeds a second predetermined threshold actuation pressure. In the case of the air drying device including a safety valve, the valve member of the purge valve can serve as a secondary protection valve. The safety valve can be configured to open when the pressure within the air drying device, particularly the pressure in the inlet unit, exceeds the second predetermined threshold actuation pressure. Depending on whether the safety valve or the valve member is configured as the primary or secondary protection valve, the value of the second predetermined threshold actuation pressure can be set higher or lower than the threshold actuation pressure of the valve member.

[0023] Therefore, in the development where the safety valve is configured as a secondary protection valve, the second predetermined threshold actuation pressure is higher than the predetermined threshold actuation pressure for allowing exhaust gas to pass through the second exhaust passage in the purge valve piston. Conversely, in an alternative embodiment where the safety valve is configured as a primary protection valve, the second predetermined threshold actuation pressure is lower than the predetermined threshold actuation pressure for allowing exhaust gas to pass through the second exhaust passage in the purge valve piston.

[0024] A third aspect of the invention is formed by a pressurized air-based system, particularly for commercial vehicles. The pressurized air-based system is particularly an air-based braking system and / or an air-based suspension system. The pressurized air-based system includes an air supply unit for supplying air, particularly a compressor. The pressurized air-based system also includes an air drying device according to a second aspect of the invention, arranged and configured to receive air from the air supply unit, dry the received air, and supply dry air to a dry air reservoir. The pressurized air-based system also includes pressurized air-based actuators, particularly braking units or suspension units, configured to operate using dry air from the air reservoir.

[0025] Therefore, the pressurized air-based system of the third aspect shares the advantages of the air drying device of the second aspect.

[0026] The fourth aspect of the invention is formed by a commercial vehicle that includes a pressurized air-based system according to the third aspect, and thus the commercial vehicle shares its advantages.

[0027] It should be understood that the purification valve of the present invention, the air drying device of the present invention, the pressurized air-based system braking system of the present invention, and the commercial vehicle of the present invention have similar and / or identical preferred embodiments.

[0028] These and other aspects of the invention will become apparent from the embodiments described below. Attached Figure Description

[0029] The following diagram illustrates:

[0030] Figure 1 This is a schematic diagram of a basically known pressurized air-based system, which has a compressed air supply facility and an air suspension unit, to explain the technical background of the basic principles of the layout of a pressurized air-based system, in which a purification valve of a preferred embodiment can be integrated;

[0031] Figure 2A This is the structure of an air drying device with a safety valve for comparison with the preferred embodiment;

[0032] Figure 2B It is basically known Figure 2A A schematic circuit diagram of the exhaust and purification channels of the air drying device;

[0033] Figure 3 This is a schematic cross-sectional view of a purge valve with integrated safety features for comparison with a preferred embodiment;

[0034] Figure 4 This is a circuit diagram of a purification valve according to a preferred embodiment of the concept of the present invention;

[0035] Figure 5 This is a cross-sectional view of a purification valve according to a preferred embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of another pressurized air-based system in the form of an air-based braking system according to the concept of the present invention;

[0037] Figure 7 This is a schematic block diagram of a commercial vehicle according to the concept of the present invention. Detailed Implementation

[0038] Figure 1A schematic diagram of a pressurized air-based system in the form of an air-based suspension system 300 is shown, in this case, a pneumatic system in the form of a compressed air supply facility 10 and an air suspension unit 90. An air suspension unit generally refers to a system of tires, tire air, springs, shock absorbers, and linkages that connect the vehicle to the wheels and allow relative movement between them. Where appropriate, the same reference numerals are used for the same or similar components or components having the same or similar functions. This particular air suspension unit 90 has multiple bellows 91, each distributed to a wheel of the vehicle, and also has an air reservoir 92 for storing rapidly available compressed air, typically dry, for the bellows 91. The bellows 91 and the air reservoir 92 are connected to a common pneumatic line forming a manifold 95, which also creates a pneumatic connection between the compressed air supply facility 10 and the air suspension unit 90. A normally closed solenoid valve 93 is connected upstream of the bellows 91 in each case as a height control valve, and a normally closed solenoid valve 94 is connected upstream of the reservoir 92 as a reservoir control valve. In this case, solenoid valves 93 and 94 are arranged in a valve manifold 96 containing five solenoid valves. In a modified embodiment, valve manifold 96 may have other or fewer solenoid valves and / or solenoid valves arranged in a two-way valve manifold. A manifold generally refers to any type of collection line from which branch lines extend to bellows 91, reservoir 92, and / or to compressed air supply facility 10.

[0039] Compressed air supply facility 10 is used to operate air suspension unit 90 or any other suitable air-based unit, such as braking unit. Figure 1(Not shown in the diagram) and supplies air to its manifold 95 via compressed air connection 2. The compressed air supply facility 10 also has an air supply source 0 for drawing in air, for example, via filter 0.1, and a vent port 3 for releasing air into the environment, for example, via filter 3.1. Filter 3.1 or 0.1 is located downstream of vent port 3 in the venting direction, or upstream of air supply source 0 opposite to the filling direction. Air suspension unit 90 is arranged downstream of compressed air connection 2 in the filling direction. Furthermore, the compressed air supply facility 10 has an air condenser in the form of an air compressor 21 in the pneumatic connection between air supply source 0 and compressed air supply source 1, the compressor being driven by motor M and configured to supply compressed air to compressed air supply source 1. Air drying unit 22 and an optional first throttle valve 31 (in this case, a regenerative throttle valve) are further provided in the pneumatic connection between compressed air supply source 1 and compressed air connection 2. The filter 0.1, air supply source 0, air compressor 21, compressed air supply source 1, air drying unit 22 and first throttle valve 31 are arranged in this order together with compressed air connection 2 in compressed air line 20, and compressed air line 20 forms a pneumatic connection with manifold 95.

[0040] In the pneumatic connection between the compressed air supply line 1 and the vent port 3 in the compressed air supply facility 10, a purge valve arrangement is provided. This purge valve arrangement takes the form of a controllable solenoid valve arrangement 40, which has a solenoid portion 43 and a pneumatic portion 44 for releasing exhaust gas into the vent port 3. The solenoid valve arrangement 40 is constructed within the vent line 30 forming the pneumatic connection. This vent line 30 may have a second throttle valve 32 as a vent throttle valve between the compressed air supply source 1 and the solenoid valve arrangement 40. In this case, the solenoid valve arrangement 40 is formed by a normally closed single solenoid valve, which is activated via a control line 65 providing a purge signal.

[0041] In this case, it is advantageous to provide a section of the vent line 30 forming a pneumatic chamber on the pressure source side for pneumatically attaching the solenoid valve arrangement 40 and the second throttle valve 32 to the compressed air supply line 20 to the compressed air supply source 1. When the compressed air supply facility 10 is being purified, the connection between the air compressor 21 and the air drying unit 22 to the compressed air supply source 1 causes the compressed air to be vented or purified via the vent line 30. The compressed air is removed upstream of the air drying unit 22, simply put, as undried air.

[0042] from Figure 1As can be clearly seen from the description of the embodiment, the compressed air supply facility 10 is constructed with a solenoid valve arrangement 40, which, as a directly controlled venting solenoid valve arrangement, allows for direct connection of the entire compressed air volume via actuation via control line 65. The solenoid valve symbolically represented by the solenoid valve arrangement 40 is a single valve within the solenoid valve arrangement 40. This arrangement allows for rapid and flexible venting of the air suspension unit 90 or the compressed air supply facility 10 without the need for additional control valves.

[0043] Figure 2A A schematic diagram of an air drying device 200 is shown. The air drying device 200 includes an air drying unit 208 in the form of an air cylinder and an airflow control unit 218. The airflow control unit 218 has necessary pneumatic connections for connecting the air drying device 200 to a pressurized air-based system. The air drying device 200 includes a purification valve 230 and a safety valve 220. The purification valve 230 is shown as a solenoid valve that can be controlled by providing a purification signal S. The safety valve 220... Figure 2A The illustration shows a cross-section. Safety valve 220 is arranged and configured to control the flow of air from the air dryer 200 to the outside when the pressure inside the air dryer exceeds a predetermined pressure threshold. As shown in the cross-sectional view, safety valve 220 includes a safety valve body 222 and a safety valve piston 224 disposed within the safety valve body 222 and configured to be actuated against the spring force of the safety valve spring element 226. When the pressure is below the predetermined pressure threshold, safety valve 220 closes. When the pressure acting on safety valve piston 224 exceeds the predetermined pressure threshold, safety valve piston 224 compresses safety valve spring element 226 to create a passage allowing air to flow to the outside, thereby reducing the pressure inside the air dryer 200.

[0044] Figure 2B A schematic circuit diagram of the air drying device 200, particularly its exhaust and purification passages, is shown. Air in the airflow control unit 218 of the air drying device 200 can be purified upon the provision of a purification signal S, which causes the purification valve 230 to open. The purified air is directed to the environment or external space 106 of the air drying device 200. However, if the air pressure in the airflow control unit 218 exceeds a predetermined pressure threshold, a piston overcomes the spring force of the safety valve spring element 226, causing the safety valve 220 to open, thereby releasing air to the external space 106 and resulting in a decrease in air pressure in the airflow control unit.

[0045] Figure 3A schematic cross-sectional view of a purification valve 39 with integrated safety functions, which is part of an air drying device (not shown), is shown. The purification valve 39 includes a purification valve body 102 that forms a first exhaust passage 104 connecting an inlet line 101 to an outlet line 103, which in turn connects to the exterior 106 of the purification valve 39. In the purification valve 39, a purification valve piston 108 is arranged within the purification valve body 102 to control the exhaust flow from the inlet line 101 through the first exhaust passage 104 to the outlet line 103. The purification valve body 102 includes at least one inlet window 132 arranged on the peripheral wall of the purification valve body 102 and configured as an air inlet for the first exhaust passage 104.

[0046] In operation under the primary function of purification, the regeneration / solenoid valve (not shown) provides an air signal to open the purification valve 39. For example... Figure 1 As shown, pressure P acts on the top 109 of the purge valve piston 108, overcoming the spring force of the purge valve spring element 136. The purge valve spring element 136 is arranged and configured to ensure the tightness of the purge valve 39 at maximum operating pressure. The purge valve 39 is also configured to perform the additional function of a safety valve. Pressure from the main chamber of the drying unit also acts on an annular protrusion 138, which extends radially from the purge valve piston and is configured to contact the purge valve body 102 at the valve seat 134 in the closed position of the purge valve 39. The annular protrusion provides a lower area than the top 109 of the purge valve piston 108 on which pressure P acts, and also overcomes the same spring force of the purge valve spring element 136. The spring force of the purge valve spring element 136 is calculated to achieve proper movement of the purge valve piston 108 at a given cut-off and cut-in pressure. The balance between the top surface 109 of the purge valve piston and the surface of the annular protrusion is designed to ensure proper sealing and full opening during the regeneration phase of the air dryer, where the purge function, controlled by the purge signal S, occurs. Typically, in the so-called safe mode, the purge valve's opening pressure needs to be set high enough (usually more than 4 bar higher than the maximum operating pressure) to prevent leakage of the purge valve 39 during normal operation. Furthermore, it ensures the tightness of the air dryer by taking into account the relaxation of the purge valve spring element 136 over its lifespan. This is typically achieved by using an additional gasket configuration, for example, two 0.5 mm gaskets to provide the required spring compression. However, such a large pressure difference between the shut-off or maximum operating pressure and the safe opening pressure in safe mode is unacceptable, considering the potential failure caused by system overpressure. Moreover, adjusting the opening pressure in safe mode is both complex and time-consuming. Additionally, the large difference between the maximum operating pressure and the opening pressure in safe mode reduces the likelihood of using the purge valve 39 in applications where the required difference is not significant.

[0047] Figure 4 A circuit diagram of the purification valve 100 according to the present invention is shown. Figure 5 A cross-sectional view of the purification valve 100 according to the present invention is shown.

[0048] according to Figure 4 The circuit diagram of the purification valve 100 shown indicates that the inlet line 101 can be connected to the first exhaust passage 104 and the second exhaust passage 112. Airflow through the first exhaust passage is controlled by a purification signal S, which switches the solenoid valve to the open state. Airflow through the second exhaust passage is controlled by a valve component 114, which is integrated within the solenoid purification valve, as will be discussed below. Figure 5 Let me explain. Both channels lead to outlet line 103, which in turn leads to the outside of purge valve 100.

[0049] like Figure 5 As shown, the purification valve 100 includes a purification valve body 102, which forms a first exhaust passage 104. This first exhaust passage connects the inlet line 101 to the outlet line 103, which in turn connects to the exterior 106 of the purification valve 100. A purification valve piston 108 is disposed within the purification valve body 102 to control the exhaust flow from the inlet line 101 through the first exhaust passage 104 to the outlet line 103. The shape of the purification valve body and the shape of the purification valve piston can be consistent with... Figure 3 The purification valves 39 are essentially the same as those in the purification valve 100, thus the existing purification valve 39 can be replaced by the purification valve 100. As in Figure 3 In the case of the purge valve 39, the purge valve piston 108 of the purge valve 100 can be actuated upon receiving a purge signal S. The purge valve piston 108 of the purge valve 100 also includes a through opening 110 configured to form a second exhaust passage 112 for connecting the inlet line 101 to the outlet line 103. Figure 4 As can be seen from the circuit diagram, the second exhaust channel 112 is established separately from the first exhaust channel 104.

[0050] In addition, such as Figure 5 As shown, valve member 114 is arranged in the through opening 110. Valve member 114 is configured to control the exhaust flow through the second exhaust passage 112. Valve member 114 is arranged and configured to be actuated by pressurized air when the pressure of the pressurized air in the inlet line 101 exceeds a threshold actuation pressure, or in other words, exceeds a safe opening pressure.

[0051] Purification valve 100 is suitable for air drying devices, such as air drying device 200. Figure 5As shown, a solution with integrated safety valve functionality in the form of valve component 114 is directly implemented into the purge valve piston 108. The exemplary purge valve 100 allows the difference between the shut-off or maximum operating pressure and the safe opening pressure to be reduced to approximately 1:1.5. Furthermore, integrating additional safety functions into the existing purge valve body 102 does not affect its external dimensions.

[0052] exist Figure 5 In the purification valve 100, the valve component 114 includes a valve body 116 formed by the purification valve piston 108. Furthermore, the valve component 114 includes a valve piston 118 disposed within the through opening 110 and configured to be actuated against the spring force of the valve spring element 120. This valve spring element 120 differs from the purification valve spring element 136, thus enabling the separation of purification and safety functions.

[0053] Valve component 114 advantageously includes an adjusting nut 122 disposed within the through opening 110. The adjusting nut includes an annular recess 124 and a central recess 126. The annular recess 124 is arranged and configured to receive a valve spring element 120, and the central recess 126 is arranged and configured to receive a piston rod 128 attached to a valve piston 118. A portion of a second exhaust passage is formed in the annular recess, which provides a seat for the valve spring element 120 while having openings through which air flows. The adjusting nut 122 can be used to set the opening pressure value, i.e., the threshold actuation pressure, which is more than the value described above regarding… Figure 3 The described adjustment process using gaskets is more precise and less time-consuming. Furthermore, integrated valve components eliminate the need for external safety valves and reduce production costs because no additional ports or their machining are required.

[0054] The purge valve piston 108 advantageously includes at least one air passage window 130 disposed on the peripheral wall of the purge valve piston 108 and configured as the air inlet of the second exhaust passage 112. The air passage window 130 is arranged radially and forms the first section of the second exhaust passage 122. Air in the air passage window acts on the valve seat 119 of the valve member 114.

[0055] The purification valve body 102 of the purification valve 100 also includes at least one inlet window 132, which is disposed on the peripheral wall of the purification valve body 102 and configured as the air inlet of the first exhaust passage 104. Specifically, in the closed state of the purification valve 100, the distance between the purification valve seat 134 and the inlet window 132 is less than the distance between the purification valve seat 134 and the air passage window 130 in the purification valve piston 108. This configuration, where the air passage window 130 is positioned higher than the inlet window 132, avoids potential contamination from oil particles and moisture at the integrated valve member 114.

[0056] Purification signal S (see Figure 4 The receipt of the air triggers the supply of pressurized air, which applies pressure P to the distal tip 109 of the purge valve piston 108. This causes the purge valve piston 108 to overcome the spring force of the purge valve spring element 136 and thus open the first exhaust passage 104.

[0057] Figure 6 A schematic diagram of another air-based pressurized system in the form of an air-based braking system 301 is shown. An air-based braking system, or more formally, a compressed air braking system, is a friction brake for a vehicle in which compressed air pressed against a piston applies the pressure required to stop the vehicle to the brake pads. Air brakes are advantageously used in large, heavy vehicles, particularly those with multiple trailers that must be linked to the braking system, such as trucks, buses, trailers, and semi-trailers.

[0058] Figure 1 The pressurized air-based system 300 and Figure 6 The 301 specification can be used for commercial vehicles, which will be subject to reference. Figure 7 The following description is provided. The air-based system 301 includes a compressed air supply unit 302, such as a compressor, arranged and configured to supply compressed air to the air-based system. The air-based system includes an air dryer 200 having a purging valve according to the invention, connected to the compressed air supply unit 302 and configured to receive compressed air, dry the received compressed air, and supply dry air via an outlet port. The air-based system also includes a dry air reservoir 304 or a dry air supply source, connected to the outlet port of the air dryer 200 and configured to store dry air. The air-based braking system includes a braking unit 306. Furthermore, as shown by the dashed lines, the pressurized air-based system 300B can also supply dry air for the operation of the suspension unit 90, as referenced above. Figure 1As explained. Braking unit 306 and / or suspension unit 90 are connected to dry air reservoir 304. Braking unit 306 is configured to apply braking force to the wheels of the vehicle when dry air is supplied from air reservoir 304. Suspension unit 90 is configured to apply damping function to the vehicle when dry air is supplied from air reservoir 304. Damping generally refers to the control of motion or oscillation, such as the use of hydraulic / pneumatic brakes and valves in vehicle shock absorbers. Damping controls the speed and resistance of a vehicle's suspension. Without damping, a car will oscillate up and down. At the appropriate level of damping, the vehicle will stabilize and return to normal in the shortest possible time. Most damping in modern vehicles can be controlled by increasing or decreasing the resistance to fluid flow in the shock absorber.

[0059] about Figure 6 An air drying apparatus 200 includes an inlet unit 204 for receiving air from an air supply unit 302 of a pressurized air-based system 300. An outlet unit 206 is configured to supply dry air to a dry air reservoir 304 of the pressurized air-based system 300. A drying unit 208 includes a first port 210 connected to the inlet unit 204, a second port 212 connected to the outlet unit 206, and a drying chamber 214 disposed between the first port 210 and the second port 212. The drying chamber 214 typically includes a desiccant material and sometimes includes a filter unit for particles or oil. Furthermore, a purification unit 216 is connected to the first port 210, wherein the purification unit 216 includes a purification valve 100 according to the invention. An inlet line 101 is connected to the first port 210, and the purification valve 100 is arranged and configured to control the exhaust flow from the inlet line 101 through a first exhaust passage 104 and through a second exhaust passage 112 to the outlet line 103, as referenced above. Figure 4 and 5 The explanation given.

[0060] Figure 7 A schematic block diagram of a commercial vehicle 400 according to the invention is shown. The commercial vehicle includes a suspension system comprising a suspension unit 90 connected to wheels 402 of the vehicle 400. As described above, the suspension unit includes a system of tires, tire air, springs, shock absorbers, and linkages that connect the vehicle 400 to its wheels 402 and allow relative movement between them. The suspension system 300 is advantageously configured to apply a damping function to the vehicle 400 based on the supply of dry air from an air reservoir 304 to the suspension unit 90. The commercial vehicle 400 also includes a braking system comprising a braking unit 306, wherein compressed air pressed against a piston is typically used to apply the pressure required to stop the vehicle 400 to the brake pads. The commercial vehicle may include an electronic control unit 450 connected to (see...) Figure 7(The dashed line in the diagram) connects to the compressed air supply unit 302. The air drying device 200 includes a purification valve 100 according to the invention and is optionally also connected to the air reservoir 304, and / or the suspension unit 90 and / or the braking unit 206, and is configured to control the operation of the compressed air supply unit 302 and the air drying device 200 by providing a purification signal S. For example, the electronic control unit can receive status information from the air reservoir 304, such as information about the pressure of the air stored therein, or from the braking and / or suspension units 306, 90, such as information about their current operation, and based on the received status information, operate the compressed air supply unit 302 and the air drying device 200 according to predetermined operating parameters.

[0061] In summary, the present invention relates to a purification valve with integrated safety functions suitable for air drying apparatus. In the purification valve, a purification valve body forms a first exhaust passage for connecting an inlet line to an outlet line. A purification valve piston is arranged within the purification valve body to control the exhaust flow through the first exhaust passage upon receiving a purification signal. The purification valve piston includes a through opening configured to form a second exhaust passage for connecting the inlet line to the outlet line. A valve member is arranged in the through opening and configured to control the exhaust flow through the second exhaust passage. The valve member is configured to be actuated by pressurized air when the pressure in the inlet line exceeds a threshold actuation pressure.

[0062] When practicing the claimed invention, those skilled in the art can understand and implement other variations of the disclosed embodiments by studying the accompanying drawings and the disclosure.

[0063] In this application, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" does not exclude multiple.

[0064] A single unit or device can perform the functions of several items listed in this invention.

[0065] No reference numerals in the accompanying drawings should be construed as limiting the scope of protection of this invention.

[0066] List of reference numerals

[0067] 0 air supply sources

[0068] 0.1 filter

[0069] 1 Compressed air supply source

[0070] 2 Compressed air connection part

[0071] 3 venting ports

[0072] 3.1 Filter

[0073] 10 Compressed air supply facilities

[0074] 20 Compressed Air Lines

[0075] 21 air compressor

[0076] 22 air drying units

[0077] 30 Venting Line

[0078] 31 First throttle valve

[0079] 32 Second Throttle Valve

[0080] 39 Purification Valve

[0081] 40 Controllable Solenoid Valve Arrangement

[0082] 43 Solenoid section

[0083] 44 Pneumatic Components

[0084] 65 control line

[0085] 90 suspension unit

[0086] 91 Corrugated Pipe

[0087] 92 air storage unit

[0088] 93 Solenoid Valve

[0089] 94 Solenoid Valve

[0090] 95 manifold

[0091] 96 valve manifold

[0092] 100 Purification Valve

[0093] 101 Inlet Pipeline

[0094] 102 Purification Valve Body

[0095] 103 Outlet Pipeline

[0096] 104 First Exhaust Channel

[0097] 106 External Environment

[0098] 108 Purification Valve Piston

[0099] Top of the piston of the 109 purification valve

[0100] 110 through opening

[0101] 112 Second Exhaust Channel

[0102] 114 Valve Components

[0103] 116 valve body

[0104] 118 valve piston

[0105] Valve seat of valve component 119

[0106] 120 valve spring element

[0107] 122 Adjusting Nut

[0108] 124 Annular Recess

[0109] 126 Central recess

[0110] 128 piston rod

[0111] 130 air through the window

[0112] 132 Entrance Window

[0113] 134 valve seat

[0114] 136 Purification Valve Spring Element

[0115] 138 ring protrusions

[0116] 200 air drying unit

[0117] 204 Entrance Unit

[0118] 206 Export Unit

[0119] 208 air drying unit

[0120] 210 first port

[0121] 212 Second Port

[0122] 214 Drying Chamber

[0123] 216 purification unit

[0124] 218 Airflow Control Unit

[0125] 220 safety valve

[0126] 222 Safety Valve Body

[0127] 224 Safety Valve Piston

[0128] 226 Safety Valve Spring Element

[0129] 230 purification valve

[0130] 300 air-based suspension system

[0131] 301 Air-based braking system

[0132] 302 Compressed Air Supply Unit

[0133] 304 dry air storage unit

[0134] 306 Braking Unit

[0135] 400 commercial vehicles

[0136] 402 wheels

[0137] 450 Electronic Control Unit

[0138] M motor

[0139] P pressure

[0140] S Purification signal.

Claims

1. A purification valve (100) for an air drying device (200), the purification valve (100) comprising: Purification valve body (102) forms a first exhaust passage (104) for connecting an inlet pipeline (101) to an outlet pipeline (103), the outlet pipeline being connected to the outside (106) of the purification valve (100); The purification valve piston (108) is arranged inside the purification valve body (102) to control the exhaust flow from the inlet pipe (101) through the first exhaust passage (104) to the outlet pipe (103); wherein the purification valve piston (108) is actuated upon receiving a purification signal (S). Its features The purge valve piston (108) further includes a through opening (110) configured to form a second exhaust passage (112) for connecting the inlet line (101) to the outlet line (103). The second exhaust passage (112) is separately established from the first exhaust passage (104). A valve member (114) is arranged in the through opening (110), and the valve member (114) is configured to control the exhaust flow through the second exhaust passage (112). The valve component (114) is arranged and configured to be actuated by the pressurized air when the pressure value of the pressurized air in the inlet line (101) exceeds a threshold actuation pressure.

2. The purification valve (100) according to claim 1, wherein the valve component (114) includes a valve body (116) formed by the purification valve piston (108).

3. The purification valve (100) according to claim 1 or 2, wherein, The valve component (114) includes a valve piston (118) configured to be actuated against the spring force of the valve spring element (120).

4. The purification valve (100) according to claim 3, wherein, The valve component (114) further includes an adjusting nut (122) disposed within the through opening (110) and including an annular recess (124) and a central recess (126). The annular recess (124) is arranged and configured to receive the valve spring element (120), and the central recess (126) is arranged and configured to receive a piston rod (128) attached to the valve piston (118).

5. The purification valve (100) according to claim 1 or 2, wherein the purification valve piston (108) includes at least one air passage window (130) arranged on the peripheral wall of the purification valve piston (108) and configured as an air inlet of the second exhaust passage (112).

6. The purification valve (100) according to claim 5, wherein, The purification valve body (102) includes at least one inlet window, which is arranged on the peripheral wall of the purification valve body (102) and configured as an air inlet of the first exhaust passage (104).

7. The purification valve (100) according to claim 6, wherein, When the purification valve (100) is closed, the distance between the purification valve seat (134) and the inlet window (132) is less than the distance between the purification valve seat (134) and the air passage window (130) in the purification valve piston (108).

8. The purification valve according to claim 1 or 2, wherein, Upon receiving the purification signal, pressurized air is supplied, which applies pressure (P) to the distal end (109) of the purification valve piston (108), causing the purification valve piston (108) to overcome the spring force of the purification valve spring element (136) and thus open the first exhaust passage (104).

9. An air drying device (200) for drying air in a pressurized air-based system (300, 301) of a commercial vehicle (400), the air drying device (200) comprising: An inlet unit (204) is provided for receiving air from the air supply unit (302) of the pressurized air-based system (300, 301); An outlet unit (206) is used to supply dry air to the dry air reservoir (304) of the pressurized air-based system (300); A drying unit (208) includes a first port (210) connected to the inlet unit, a second port (212) connected to the outlet unit, and a drying chamber (214) disposed between the first port (210) and the second port (212) and comprising a desiccant material. A purification unit (216) is connected to the first port (210). The purification unit (216) includes a purification valve (100) according to any one of claims 1-8. The inlet line (101) is connected to the first port, and the purge valve (100) is arranged and configured to control the exhaust flow from the inlet line (101) through the first exhaust passage (104) and through the second exhaust passage (112) to the outlet line (103).

10. The air drying apparatus (200) according to claim 9, wherein, The drying unit (208) is configured to operate in both an inflation mode and a regeneration mode. In the inflation mode, the drying unit is configured to receive air through the first port (210), dry the received air, and supply dry air to the outlet unit (206) through the second port (212). In the regeneration mode, the drying unit is configured to receive dry air through the second port (212) and provide exhaust through the first port (210).

11. The air drying apparatus (200) according to claim 9 or 10, further comprising a safety valve (220) connected to the inlet unit and configured to allow airflow to the outside when the pressure inside the air drying apparatus exceeds a second predetermined threshold actuation pressure.

12. The air drying apparatus (200) according to claim 11, wherein, The second predetermined threshold actuation pressure is higher than the predetermined threshold actuation pressure that allows exhaust gas to pass through the second exhaust passage (112) in the purge valve piston (108).

13. A pressurized air-based system (300, 301) for a commercial vehicle (400), said pressurized air-based system comprising: Air supply unit (302) for supplying air; The air drying apparatus (200) according to any one of claims 9 to 11 is arranged and configured to receive air from the air supply unit, dry the received air and provide the dried air to the dry air storage unit (304). The pressurized air-based actuators (306, 90) are configured to operate using dry air from the dry air reservoir (304).

14. The pressurized air-based system (300, 301) for a commercial vehicle (400) according to claim 13, wherein, The pressurized air-based system is an air-based braking system (301) and / or an air-based suspension system (300).

15. The pressurized air-based system (300, 301) for a commercial vehicle (400) according to claim 13, wherein, The air supply unit is a compressor.

16. The pressurized air-based system (300, 301) for a commercial vehicle (400) according to claim 13, wherein, The pressurized air-based actuator is either a braking unit (306) or a suspension unit (90).

17. A commercial vehicle (400) comprising a pressurized air-based system (300, 301) according to claim 13.

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