Multi-channel closed distribution valve block

Abstract

The utility model discloses a multi-channel closed distribution valve block which comprises an upper channel plate, a lower channel plate and a channel plate sealing piece. The upper channel plate and the lower channel plate are oppositely arranged, and a plurality of gas path channels are arranged on the opposite surfaces; the channel plate sealing piece is located between the upper channel plate and the lower channel plate and separates the gas circuit channels. A plurality of pipe joints are arranged on one side, deviating from the upper channel plate, of the lower channel plate, and the gas path channels on the lower channel plate are correspondingly communicated with the pipe joints; a plurality of electromagnetic valves and a pressure sensor are arranged on the side, deviating from the lower channel plate, of the upper channel plate, and the air channel on the upper channel plate is correspondingly communicated with the electromagnetic valves and the pressure sensor. According to the scheme, the valve block can achieve the function of a closed system; meanwhile, the air paths are arranged on the upper surfaces and the lower surfaces of the two air path channel plates respectively, cross-plane conduction of the shaft hole and the side hole of the electromagnetic valve is achieved, manufacturing of the air path channel plates can be completed through rapid forming of a mold, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of air suspension technology, specifically to a multi-channel closed-loop distribution valve block. Background Technology

[0002] Driven by the era of consumption upgrading, people have higher requirements for the comfort and safety of automobiles. The superior performance of air suspension meets the needs of high-end car consumers. Meanwhile, with the rise of new energy vehicles, their chassis structure is sensitive to vehicle height and NVH requirements. The height adjustability, ride smoothness, and features of air suspension, such as reducing wind resistance and protecting the battery, are in line with the development of new energy vehicles. More and more mid-to-high-end new energy models are equipped with air suspension as standard equipment.

[0003] Existing air suspension systems are mainly divided into two types: open systems and closed systems. Among them, closed systems have obvious advantages over open systems in terms of functionality, NVH, and energy consumption. However, due to the high degree of integration of existing closed systems, the built-in ECU limits the freedom of OEMs in system tuning. In addition, the speed at which closed systems control the rise and fall of air springs is slower than that of open systems.

[0004] Meanwhile, the existing closed-loop system valve blocks have a complex air passage connection design for each mounting hole. Connections and layering between air passages are achieved through drilling with varying angles and depths between different air passages, and by sealing the air passage openings. This involves complex processing parameters, high sealing requirements, and overall high processing difficulty and cost. Currently, valve blocks used in air suspension systems on the market can typically only be used in open-loop systems and cannot achieve closed-loop inflation. However, due to the scarcity of closed-loop air supply system products on the market, and the difficulty in upgrading existing vehicles with open-loop air supply systems to closed-loop systems, the current market demand for such systems is limited. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings of existing air suspension closed-loop air supply systems by providing a multi-channel closed-loop distribution valve block. This solution, based on an open-loop distribution valve, integrates the arrangement of solenoid valves and the air path design within the valve block, enabling it to fulfill the functions of a closed-loop system. Furthermore, by dividing the air path plate into upper and lower sections, with air paths arranged on the upper and lower surfaces of the two air path plate respectively, it not only achieves cross-plane communication between the solenoid valve shaft hole and side hole but also allows for rapid molding of the air path plate, reducing production costs.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model provides a multi-channel closed-loop distribution valve block, including an upper channel plate, a lower channel plate, and a channel plate seal. The upper and lower channel plates are arranged opposite to each other and have a plurality of air passages on their opposite surfaces. The channel plate seal is located between the upper and lower channel plates and separates each air passage. The lower channel plate has a plurality of pipe joints on the side opposite to the upper channel plate, and the air passages on the lower channel plate are connected to each pipe joint. The upper channel plate has a plurality of solenoid valves and a pressure sensor on the side opposite to the lower channel plate, and the air passages on the upper channel plate are connected to each solenoid valve and the pressure sensor.

[0008] As a preferred embodiment of this utility model, there are eight pipe joints, wherein the first to fourth pipe joints are used to connect to the four air springs respectively, the fifth pipe joint is used to connect to the expansion device, the sixth pipe joint is used to connect to the air outlet of the air pump, the seventh pipe joint is used to connect to the air tank, and the eighth pipe joint is used to connect to the air inlet of the air pump.

[0009] As a preferred embodiment of this utility model, there are nine gas passages. A first gas passage is connected to the sixth pipe connector, and the first gas passage is connected to the first pipe connector to the fifth pipe connector via a second gas passage to the sixth gas passage. A first switching solenoid valve is provided on the first gas passage, and first functional solenoid valves to fifth functional solenoid valves are provided on the second gas passage to the sixth gas passage. A seventh gas passage is connected to the eighth pipe connector and the first gas passage, and a second switching solenoid valve is provided on the seventh gas passage. An eighth gas passage is connected to the seventh pipe connector and the eighth pipe connector, and a third switching solenoid valve is provided on the eighth gas passage. A ninth gas passage is connected to the sixth pipe connector and the seventh pipe connector, and a fourth switching solenoid valve is provided on the ninth gas passage.

[0010] As a preferred embodiment of this utility model, the measuring point of the pressure sensor is located in the first air path, and the pressure sensor is used to detect the pressure of the corresponding air path of the distribution valve block in each working mode.

[0011] As a preferred embodiment of this utility model, all solenoid valves are two-position, two-way normally closed switching valves, and also have a one-way valve function.

[0012] As a preferred embodiment of this utility model, it also includes a rear cover, which is connected to the side of the upper channel plate opposite to the lower channel plate to cover the solenoid valve and the pressure sensor.

[0013] As a preferred embodiment of this utility model, the rear cover is further provided with a sealing groove, and a sealing ring is provided in the sealing groove to seal the mating surface between the rear cover and the upper channel plate.

[0014] As a preferred embodiment of this utility model, the rear cover is provided with an ECU, and all the solenoid valve coils are installed on the rear cover and connected to the ECU via pins.

[0015] As a preferred embodiment of this utility model, the rear cover is further provided with a support block, which is used to axially limit the solenoid valve coil. The support block also has a protrusion, which is arranged between different solenoid valve coils to provide radial limit for the solenoid valve coil.

[0016] As a preferred embodiment of this utility model, the rear cover, the upper channel plate, and the lower channel plate are connected as a whole by fastening screws and threaded nuts.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] 1. The multi-channel closed distribution valve block of this utility model has a channel plate divided into upper and lower layers. All air passages distributed radially along the solenoid valve are arranged on the upper and lower surfaces of the two air passage plates. Air passages distributed axially along the solenoid valve are provided to connect each solenoid valve and pipe joint to the corresponding air passage. Valve holes that were not originally on the same plane are connected to the same plane. The channel plate can be quickly formed by mold to complete the manufacturing, avoiding multi-angle drilling of air passages and air passage blockage at the drill hole, reducing leakage risk and reducing production costs.

[0019] 2. The multi-channel closed-loop distribution valve block in this utility model, based on the open-loop distribution valve, increases the number of solenoid valves and redesigns the air path, enabling the air spring open-loop air supply system to achieve multiple operating modes such as open-loop air spring inflation, open-loop air tank inflation, closed-loop inflation, closed-loop accelerated inflation, open-loop air spring exhaust, dryer regeneration, and closed-loop exhaust simply by replacing the open-loop distribution valve with the multi-channel closed-loop distribution valve block. This allows a large number of vehicles equipped with open-loop air supply systems to be quickly upgraded to closed-loop air supply systems. At the same time, it adds an expansion port to the existing closed-loop air supply system, which can be used to realize extended functions such as tire inflation, seat support, and rear window cleaning.

[0020] 3. The multi-channel closed distribution valve block in this utility model has a certain number of support blocks arranged on its rear cover. The support blocks have an axial limiting effect on the solenoid valve coil. The support blocks also have protrusions. The protrusions are arranged between different solenoid valve coils and can fit with the outer circle of the coil. While providing radial limiting for the solenoid valve coil, they also reserve a certain radial degree of freedom for the solenoid valve coil. This reduces the assembly difficulty of the rear cover sub-assembly and the channel plate sub-assembly. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is an overall diagram of the multi-channel closed-loop distribution valve block in this utility model;

[0023] Figure 2 This is an exploded view of the multi-channel closed-loop distribution valve block in this utility model;

[0024] Figure 3 This is a schematic diagram of the multi-channel closed-loop distribution valve block system in this utility model;

[0025] Figure 4 Perspective view of the valve block in this utility model Figure 1 ;

[0026] Figure 5 Perspective view of the valve block in this utility model Figure 2 ;

[0027] Figure 6 This is a schematic diagram of the valve block sealing partition in this utility model;

[0028] Figure 7 This is a schematic diagram of the interior of the back cover in this utility model.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 1. Pipe connectors; 1.1 to 1.8 are the first to the eighth pipe connectors respectively; 2. Switching solenoid valves; 2.1 to 2.4 are the first to the fourth switching solenoid valves respectively; 3. Functional solenoid valves; 3.1 to 3.5 are the first to the fifth functional solenoid valves respectively; 4. Pressure sensor; 5a. First air path; 5A to 5E are the second to the sixth air path respectively; 5b to 5d are the seventh to the ninth air path respectively; 6. Upper channel plate; 7. Lower channel plate; 8. Solenoid valve coil; 9. Channel plate seal; 10. Rear cover; 10a. Support block; 10b. Protrusion; 11. ECU; 12. Fastening screw; 13. Sealing ring; 14. Straight thread nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0036] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0037] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0038] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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 mechanical connection or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] Please refer to Figures 1 to 7 This application provides a multi-channel closed-loop distribution valve block, including an upper channel plate 6, a lower channel plate 7, and a channel plate seal 9. The upper channel plate 6 and the lower channel plate 7 are arranged opposite to each other and have a plurality of air passages on their opposite surfaces. The channel plate seal 9 is located between the upper channel plate 6 and the lower channel plate 7 and separates each air passage. The lower channel plate 7 has a plurality of pipe joints 1 on the side opposite to the upper channel plate 6, and the air passages on the lower channel plate 7 are connected to each pipe joint 1. The upper channel plate 6 has a plurality of solenoid valves 2 / 3 and a pressure sensor 4 on the side opposite to the lower channel plate 7, and the air passages on the upper channel plate 6 are connected to each solenoid valve 2 / 3 and the pressure sensor 4.

[0041] Specifically, several air passages are arranged on the bottom surface of the upper channel plate 6 and the top surface of the lower channel plate 7. A channel plate seal 9 is arranged between the two channel plates to separate the air passages and achieve the closure of a single air passage. Several pipe joint mounting holes are arranged on the other side of the lower channel plate 7. The pipe joint 1 is threadedly connected to the lower channel plate 7, and the air passages on the lower channel plate 7 are connected to each pipe joint mounting hole. The top surface of the upper channel plate 6 has several solenoid valve mounting holes and one pressure sensor mounting hole. The air passages on the upper channel plate 6 are connected to each mounting hole, and each solenoid valve mounting hole is connected to two different air passages. A sealing ring is provided on the solenoid valve 2 / 3. The solenoid valve 2 / 3 and the pressure sensor 4 are installed in the corresponding mounting holes. The above components constitute the channel plate sub-assembly of the multi-channel closed distribution valve block.

[0042] According to some embodiments of this application, the pipe fitting 1 has eight parts, wherein the first to fourth pipe fittings 1.1 to 1.4 are used to connect with four air springs ( Figure 3 The RR, RL, FR, and FL in the diagram correspond to the connection, and the fifth pipe fitting 1.5 is used for connection with the expansion equipment ( Figure 3 The sixth pipe fitting 1.6 is used for connection with the air pump (EP). Figure 3 Connect the outlet of M) to the seventh pipe fitting 1.7 for connection to the gas storage tank (M). Figure 3 The P) connection, the eighth pipe fitting 1.8 is used to connect to the air inlet of the air pump.

[0043] According to some embodiments of this application, there are nine gas passages, wherein the first gas passage 5a is connected to the sixth pipe connector 1.6, and the first gas passage 5a is connected to the first pipe connector to the fifth pipe connector 1.1 to 1.5 via the second gas passage to the sixth gas passage 5A to 5E. The first gas passage 5a is provided with a first switching solenoid valve 2.1, and the second gas passage to the sixth gas passage 5A to 5E are provided with a first functional solenoid valve to a fifth functional solenoid valve 3.1 to 3.5 respectively; the seventh gas passage 5b is connected to the eighth pipe connector 1.8 and the first gas passage 5a respectively, and the seventh gas passage 5b is provided with a second switching solenoid valve 2.2; the eighth gas passage 5c is connected to the seventh pipe connector 1.7 and the eighth pipe connector 1.8 respectively, and the eighth gas passage 5c is provided with a third switching solenoid valve 2.3; the ninth gas passage 5d is connected to the sixth pipe connector 1.6 and the seventh pipe connector 1.7 respectively, and the ninth gas passage 5d is provided with a fourth switching solenoid valve 2.4.

[0044] According to some embodiments of this application, the measuring point of the pressure sensor 4 is located in the first air path 5a, and the pressure sensor 4 is used to detect the pressure of the corresponding air path of the distribution valve block in each working mode.

[0045] According to some embodiments of this application, all two / three of the solenoid valves are two-position, two-way normally closed switching valves and have a one-way valve function. The nine solenoid valves used in this solution are all two-position, two-way normally closed switching valves and have a one-way valve function. When the solenoid valve is not energized, if the axial pressure of the solenoid valve is greater than a certain value of the lateral pressure, the solenoid valve can be opened to open the air passage.

[0046] Four of the solenoid valves are switching valves (i.e., first switching solenoid valve 2.1, second switching solenoid valve 2.2, third switching solenoid valve 2.3, and fourth switching solenoid valve 2.4), used to control the switching of the air circuit to achieve different working modes of the air spring supply system. Four other solenoid valves are air valves (i.e., first function solenoid valve 3.1, second function solenoid valve 3.2, third function solenoid valve 3.3, and fourth function solenoid valve 3.4), whose side holes are respectively connected to the pipe joints connecting the four air springs (i.e., first pipe joint 1.1, second pipe joint 1.2, third pipe joint 1.3, and fourth pipe joint 1.4), providing shock-proof protection against air leakage for the air springs. One solenoid valve is an extension port solenoid valve (i.e., fifth function solenoid valve 3.5), whose side hole is connected to a pipe joint (i.e., fifth pipe joint 1.5), which can be used to control the air source switch for extended functions such as tire inflation, seat support, and rear window cleaning.

[0047] According to some embodiments of this application, a rear cover 10 is also included, which is connected to the side of the upper channel plate 6 opposite to the lower channel plate 7 to cover the solenoid valve 2 / 3 and the pressure sensor 4.

[0048] According to some embodiments of this application, the rear cover 10 is further provided with a sealing groove, and a sealing ring 13 is provided in the sealing groove for sealing the mating surface between the rear cover 10 and the upper channel plate 6.

[0049] According to some embodiments of this application, the rear cover 10 is provided with an ECU 11, and all the solenoid valve coils 8 are mounted on the rear cover 10 and connected to the ECU 11 via pins.

[0050] According to some embodiments of this application, the rear cover 10 is further provided with a support block 10a, which is used to axially limit the solenoid valve coil 8. The support block 10a also has a protrusion 10b, which is arranged between different solenoid valve coils 8 to provide radial limiting for the solenoid valve coil 8.

[0051] According to some embodiments of this application, the rear cover 10, the upper channel plate 6, and the lower channel plate 7 are connected as a whole by fastening screws 12 and threaded nuts 14.

[0052] Specifically, a protrusion 10b is provided in the rear cover 10 for supporting and mounting the ECU 11. The solenoid valve coil 8 is mounted on the rear cover 10 and connected to the ECU 11 via a PIN pin. A certain number of support blocks 10a are also arranged on the rear cover 10. The support blocks 10a provide axial limiting for the solenoid valve coil 8. The support blocks 10a also have protrusions 10b, which are arranged between different solenoid valve coils 8, providing radial limiting for the solenoid valve coil 8 while also allowing for a certain degree of radial freedom. A sealing groove is also arranged on the rear cover 10, and a sealing ring 13 is installed in the sealing groove. The assembly of these components forms the rear cover sub-assembly of the multi-channel closed-loop distribution valve block. The channel plate sub-assembly and the rear cover assembly are fixed together with bolts to form the multi-channel closed-loop distribution valve assembly 0 (e.g., Figure 3 (The part within the dashed box).

[0053] The operating mode of the distribution valve block in this embodiment is as follows:

[0054] 1. Open inflation mode: After the air pump draws in air from the outside, pressurizes and dries it, and then enters the distribution valve block, when the first switching solenoid valve 2.1 opens, the air valve corresponding to the air spring that needs to be raised opens, realizing open inflation of the air spring; when the fourth switching solenoid valve 2.4 opens, high-pressure air enters the air tank, realizing open inflation of the air tank.

[0055] 2. Closed-loop inflation mode: When the fourth switching solenoid valve 2.4 and the first switching solenoid valve 2.1 of the distribution valve block are opened, the high-pressure gas in the gas tank is conducted to each air valve. At this time, the air valve corresponding to the air spring that needs to be raised is opened to achieve closed-loop inflation. When the third switching solenoid valve 2.3 of the distribution valve block is opened, the high-pressure gas in the gas tank enters the air pump for repressurization and drying, and is transported back to the distribution valve block. The first switching solenoid valve 2.1 is opened. At this time, the air valve corresponding to the air spring that needs to be raised is opened to achieve closed-loop accelerated inflation.

[0056] 3. Open Exhaust Mode: When the air valve corresponding to the air spring that needs to be lowered and the first switching solenoid valve 2.1 are opened, the high-pressure gas in the air spring is discharged to the atmosphere through the air pump's dryer and exhaust valve, achieving open exhaust of the air spring; when the fourth switching solenoid valve 2.4 is opened, the high-pressure gas in the air tank is discharged to the atmosphere through the air pump's dryer and exhaust valve. In this mode, the gas flows in the reverse direction at high speed through the dryer (…). Figure 3 The AD in the middle realizes the regeneration of the dryer.

[0057] 4. Closed exhaust mode: Open the air valve corresponding to the air spring that needs to be lowered and the second switching solenoid valve 2.2. The high-pressure gas enters the air pump, is pressurized and dried, and then returns to the distribution valve block. The fourth switching solenoid valve 2.4 opens the high-pressure gas to enter the air tank, realizing closed exhaust.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A multi-pass closed distribution valve block, characterized by, The application relates to a valve block for air spring, which comprises an upper passage plate (6), a lower passage plate (7) and a passage plate sealing element (9); the upper passage plate (6) is arranged opposite to the lower passage plate (7) and is provided with a plurality of air path passages on opposite surfaces; the passage plate sealing element (9) is located between the upper passage plate (6) and the lower passage plate (7) and separates the air path passages; the lower passage plate (7) is provided with a plurality of pipe joints (1) on a side away from the upper passage plate (6), the air path passages on the lower passage plate (7) are correspondingly communicated with the pipe joints (1); the upper passage plate (6) is provided with a plurality of electromagnetic valves (2, 3) and a pressure sensor (4) on a side away from the lower passage plate (7), and the air path passages on the upper passage plate (6) are correspondingly communicated with the electromagnetic valves (2, 3) and the pressure sensor (4).

2. The multi-pass closed-distribution valve block of claim 1, wherein, The pipe joints (1) are eight, wherein the first pipe joint (1.1) to the fourth pipe joint (1.4) are used for being correspondingly connected with four air springs, the fifth pipe joint (1.5) is used for being connected with an expansion device, the sixth pipe joint (1.6) is used for being connected with an air outlet of a pump, the seventh pipe joint (1.7) is used for being connected with a gas storage tank, and the eighth pipe joint (1.8) is used for being connected with an air inlet of the pump.

3. The multi-pass closed-distribution valve block of claim 2, wherein, The air path passages are nine, wherein a first air path (5a) is communicated with the sixth pipe joint (1.6), the first air path (5a) is correspondingly communicated with the first pipe joint (1.1) to the fifth pipe joint (1.5) through a second air path (5A) to a sixth air path (5E), the first air path (5a) is provided with a first switching electromagnetic valve (2.1), the second air path (5A) to the sixth air path (5E) are correspondingly provided with a first function electromagnetic valve (3.1) to a fifth function electromagnetic valve (3.5), a seventh air path (5b) is respectively communicated with the eighth pipe joint (1.8) and the first air path (5a), and the seventh air path (5b) is provided with a second switching electromagnetic valve (2.2); an eighth air path (5c) is respectively communicated with the seventh pipe joint (1.7) and the eighth pipe joint (1.8), and the eighth air path (5c) is provided with a third switching electromagnetic valve (2.3); a ninth air path (5d) is respectively communicated with the sixth pipe joint (1.6) and the seventh pipe joint (1.7), and the ninth air path (5d) is provided with a fourth switching electromagnetic valve (2.4).

4. The multi-pass closed-distribution valve block of claim 3, wherein, The measuring point of the pressure sensor (4) is located in the first air path (5a), and the pressure sensor (4) is used for detecting the pressure of the corresponding air path in each working mode of the distribution valve block.

5. The multi-pass closed-distribution valve block of claim 1, wherein, All the electromagnetic valves (2, 3) are two-position two-way normally closed on-off valves and have the function of one-way valves.

6. The multi-pass closed-distribution valve block of claim 1, wherein, The valve block further comprises a rear cover (10) connected with a side of the upper passage plate (6) away from the lower passage plate (7) to cover the electromagnetic valves (2, 3) and the pressure sensor (4).

7. The multi-pass closed-distribution valve block of claim 6, wherein, The rear cover (10) is further provided with a sealing groove, and a sealing ring (13) is arranged in the sealing groove to seal the joint surface of the rear cover (10) and the upper passage plate (6).

8. The multi-pass closed-distribution valve block of claim 6, wherein, The rear cover (10) is provided with an ECU (11), all electromagnetic valve coils (8) are installed on the rear cover (10) and are connected with the ECU (11) through PIN pins.

9. The multi-pass closed-distribution valve block of claim 6, wherein, The rear cover (10) is further provided with a supporting block (10a) for axially limiting the electromagnetic valve coils (8), and the supporting block (10a) is further provided with a protrusion (10b) arranged between different electromagnetic valve coils (8) for radially limiting the electromagnetic valve coils (8).

10. The multi-pass closed-distribution valve block of claim 6, wherein, The rear cover (10), the upper passage plate (6) and the lower passage plate (7) are connected into an integral whole through fastening screws (12) and straight thread nuts (14).

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