Multipath switching electromagnetic valve body

Abstract

The invention relates to the technical field of railway vehicle wind source systems, in particular to a multi-path switching electromagnetic valve body. A multi-way switching electromagnetic valve body comprises a body, and an input channel, a main containing cavity and an auxiliary containing cavity are formed in the body. The piston assembly comprises a connecting rod, a first piston and a second piston, the first piston and the second piston are arranged on the connecting rod, a first branch is further arranged in the body, one end of the first branch is communicated with the input channel at the first position, and the other end of the first branch is communicated with part of the main containing cavity located above the first piston; and a pilot electromagnetic valve is further included, a shell of the pilot electromagnetic valve is connected with the body, a valve element of the pilot electromagnetic valve is inserted into the first branch, and the pilot electromagnetic valve is used for cutting off or opening the first branch. The technical problems in the prior art can be solved, the multi-way switching electromagnetic valve body is urgently needed, and only one electromagnetic valve needs to be used for achieving switching of the main gas way and the auxiliary gas way.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicle air source systems, and in particular to a multi-way switching electromagnetic valve body. Background Art

[0002] The rail vehicle air source system is the core part of the train braking system, responsible for providing compressed air to ensure the normal operation of brakes and other pneumatic equipment. The rail vehicle air source outlet air path needs to be switched according to the specific working conditions, which is usually achieved with the help of solenoid valves.

[0003] The rail vehicle air source system has a main air circuit and an auxiliary air circuit. Depending on the air source required by the train, the main air circuit and the auxiliary air circuit need to switch with each other. In the prior art, if you want to switch the main air circuit and the auxiliary air circuit, that is, from the main air circuit open and the auxiliary air circuit closed, to the main air circuit closed and the auxiliary air circuit opened, or from the main air circuit closed and the auxiliary air circuit opened, to the main air circuit opened and the auxiliary air circuit closed, at least two solenoid valves are required, one of which controls the opening and closing of the main air circuit, and the other controls the opening and closing of the auxiliary air circuit. This leads to the high investment cost on the solenoid valve in the prior art. Therefore, the technical problem existing in the prior art is that it is urgent to propose a multi-way switching solenoid valve body, which only needs to use one solenoid valve to switch the main air circuit and the auxiliary air circuit. Summary of the invention

[0004] In view of the technical problems in the prior art, it is urgent to propose a multi-way switching electromagnetic valve body, which only needs to use one electromagnetic valve to realize the switching of the main gas circuit and the auxiliary gas circuit. The present invention provides a multi-way switching electromagnetic valve body.

[0005] The present invention is achieved through the following technical solutions:

[0006] A multi-way switching solenoid valve body comprises a body, an input channel, a main accommodating chamber and a secondary accommodating chamber are arranged in the body, the input channel, the main accommodating chamber and the secondary accommodating chamber intersect at a first position and form a three-way shape; a first valve port is arranged on a side of the main accommodating chamber facing the first position, and a second valve port is arranged on a side of the secondary accommodating chamber facing the first position; a main gas path and a secondary gas path are also arranged in the body, wherein the main gas path is connected to the main accommodating chamber, and the secondary gas path is connected to the secondary accommodating chamber;

[0007] The invention also includes a piston assembly, which includes a connecting rod, and a first piston and a second piston arranged on the connecting rod, wherein the connecting rod is arranged to pass through a first position, and the first piston and the second piston are respectively located on both sides of the first position along the extension direction of the connecting rod; the first piston is movably and inseparable confined in the main accommodating chamber, the side surface of the first piston is slidably sealed with the inner wall of the main accommodating chamber, the first piston is used to cut off or open the first valve port, the second piston is movably and inseparable confined in the auxiliary accommodating chamber, and the second piston is used to cut off or open the second valve port; during the movement of the piston assembly, the first valve port and the second valve port are selectively opened or selectively cut off; the piston assembly also includes a first spring, which is arranged between the second piston and the bottom wall of the auxiliary accommodating chamber;

[0008] A first branch is also provided in the body, one end of the first branch is communicated with the input channel at a first position, and the other end of the first branch is communicated with a portion of the main accommodating chamber located above the first piston;

[0009] It also includes a pilot solenoid valve, the shell of the pilot solenoid valve is connected to the body, the valve core of the pilot solenoid valve is inserted into the first branch, and the pilot solenoid valve is used to cut off or open the first branch.

[0010] Furthermore, a restriction cavity, a restriction airway and an output airway are also provided in the body, one end of the restriction airway is connected to the first branch, the position where the restriction airway is connected to the first branch is located between the input channel and the pilot solenoid valve, a section of the restriction airway away from the first branch, a section of the output airway, and a section of the main airway away from the main accommodating cavity intersect at the restriction cavity to form a three-way shape;

[0011] A limiting valve core assembly is movably arranged in the limiting cavity, and the limiting valve core assembly includes a core body, which is pointed from the limiting airway to the direction of the main airway, and the core body has an upper section and a lower section, wherein the upper section of the core body is arranged toward the limiting airway, and the lower section of the core body is arranged toward the main airway, and the upper section of the core body is slidably sealed with the airway inner wall of the limiting airway, and a protrusion is arranged on the radial side of the lower section of the core body, and a step is also arranged on the inner wall of the cavity on the side of the limiting cavity facing the main airway, and the protrusion is used to contact or separate with the step, thereby cutting off or conducting between the main airway and the output airway;

[0012] The limiting valve core assembly also includes a compression spring, the axial direction of the compression spring is from the limiting air channel to the main air channel, the inner wall of the cavity on the side away from the step in the limiting cavity is the first inner wall, the protrusion is located between the first inner wall and the step, one end of the compression spring abuts against the first inner wall, and the other end abuts against the protrusion.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. In the present invention, the switching of the main gas circuit and the auxiliary gas circuit depends on the up and down movement of the piston assembly, and the up and down movement of the piston assembly depends on the opening and closing of the pilot solenoid valve; specifically, the pilot solenoid valve is opened, and the gas acts on the upper surface of the first piston through the input channel and the first branch, thereby causing the piston assembly to move downward, that is, the main accommodating chamber moves in the direction of the auxiliary accommodating chamber, the first spring is compressed, the first piston cuts off the first valve port, and the second piston opens the second valve port; the pilot solenoid valve is closed, the gas of the first branch is cut off, and there is no gas pressure on the upper surface of the first piston. The first spring pushes the first piston and the second piston upward under the action of its own elastic force, the first piston opens the first valve port, and the second piston cuts off the second valve port; in summary, in the present invention, the switching of the gas circuit and the auxiliary gas circuit can be realized by only one solenoid valve, that is, the opening and closing of the pilot solenoid valve, which solves the technical problems existing in the prior art: it is urgent to propose a multi-way switching solenoid valve body, which only needs to use one solenoid valve to realize the switching of the main gas circuit and the auxiliary gas circuit.

[0015] 2. In the present invention, one end of the limiting airway is connected to the first branch, and one gas passes through the input channel, the first branch, the limiting airway and finally acts on the upper surface of the core; the other gas passes through the input channel, the main airway and finally acts on the lower surface of the core; if the sum of the force acting on the upper surface of the core and the elastic force of the compression spring is greater than the force acting on the lower surface of the core, the core moves downward, the protrusion contacts the step, and the main airway and the output airway are cut off; on the contrary, if the sum of the force acting on the upper surface of the core and the elastic force of the compression spring is less than the force acting on the lower surface of the core, the core moves upward, that is, the core is lifted up by the airflow of the main airway, and the main airway and the output airway are connected, and the output gas is used by the vehicle. The sum of the force acting on the upper surface of the core and the elastic force of the compression spring is the above-mentioned preset pressure. Only when the air pressure of the main airway is greater than the preset pressure, the main airway and the output airway will be connected. In summary, the present invention solves the technical problem: how to ensure that the gas entering the main gas path is output to the outside of the multi-way switching solenoid valve only when the preset pressure is reached.

[0016] 3. In the present invention, since a limiting valve core assembly is provided, the air pressure of the main air circuit must be greater than the preset pressure before it can be output to the outside, that is, the gas in the main air circuit is continuously restricted in the main air circuit before reaching the preset pressure; if this limiting valve core assembly is not provided, once gas enters the main air circuit, it will be immediately output to the external large air storage cylinder, and the air pressure in the main air circuit cannot be increased. Then, when the pilot solenoid valve is energized, the air pressure in the main air circuit is likely to be difficult to push the piston assembly up and down, resulting in incomplete valve switching and the upper and lower valve ports not being tightly closed. Therefore, the present invention can also avoid the situation where the gas in the main air circuit is output before reaching the preset pressure when the pilot solenoid valve is energized, the main air circuit continues to release pressure, and the air pressure cannot push the piston assembly up and down, thereby avoiding the failure of switching between the main air circuit and the auxiliary air circuit and the chaotic air flow of the main air circuit and the auxiliary air circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a multi-way switching electromagnetic valve body of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a multi-way switching electromagnetic valve body of the present invention;

[0019] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A in the middle.

[0020] Markings in the figure: body (100), input channel (1), main accommodating chamber (2), auxiliary accommodating chamber (3), first position (4), first valve port (5), second valve port (6), main air path (7), auxiliary air path (8), piston assembly (9), connecting rod (10), first piston (11), second piston (12), first spring (13), first branch (14), pilot solenoid valve (15), limiting chamber (16), limiting air passage (17), output air passage (18), limiting valve core assembly (19), core body (20), protrusion (21), step (22), compression spring (23), first inner wall (24), first rubber pad (25). DETAILED DESCRIPTION

[0021] The following is a further non-restrictive detailed description of the technical solution of the invention in conjunction with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and cannot be understood as limitations on the present invention.

[0022] Example 1

[0023] like Figure 1-2As shown, a preferred embodiment of the present invention proposes a multi-way switching solenoid valve body, which includes a body 100, in which an input channel 1, a main accommodating chamber 2 and a secondary accommodating chamber 3 are arranged, and the input channel 1, the main accommodating chamber 2 and the secondary accommodating chamber 3 intersect at a first position 4 and form a three-way shape; a first valve port 5 is arranged on the side of the main accommodating chamber 2 facing the first position 4, and a second valve port 6 is arranged on the side of the secondary accommodating chamber 3 facing the first position 4; a main gas path 7 and an auxiliary gas path 8 are also arranged in the body 100, wherein the main gas path 7 is connected to the main accommodating chamber 2, and the auxiliary gas path 8 is connected to the secondary accommodating chamber 3; and a piston assembly 9 is also included, the piston assembly 9 includes a connecting rod 10, and a first piston 11 and a second piston 12 arranged on the connecting rod 10, wherein the connecting rod 10 is arranged to pass through the first position 4, and, along the extension direction of the connecting rod 10, the first piston 11 and the second piston 12 are respectively located on both sides of the first position 4; the first piston 11 is movably and inseparable from being restricted in the main accommodating chamber In the cavity 2, the side of the first piston 11 is slidably sealed with the inner wall of the main accommodating cavity 2, the first piston 11 is used to cut off or open the first valve port 5, the second piston 12 is movably and inseparablely confined in the auxiliary accommodating cavity 3, and the second piston 12 is used to cut off or open the second valve port 6; during the movement of the piston assembly 9, the first valve port 5 and the second valve port 6 are selectively opened and selectively cut off; the piston assembly 9 also includes a first spring 13, and the first spring 13 is arranged between the second piston 12 and the bottom wall of the auxiliary accommodating cavity 3; a first branch 14 is also arranged in the body 100, one end of the first branch 14 is connected to the input channel 1 at the first position 4, and the other end is connected to the part of the main accommodating cavity 2 located above the first piston 11; it also includes a pilot solenoid valve 15, the shell of the pilot solenoid valve 15 is connected to the body 100, the valve core of the pilot solenoid valve 15 is inserted into the first branch 14, and the pilot solenoid valve 15 is used to cut off or open the first branch 14.

[0024] The input channel 1 is used to input gas, which is a linear channel in this embodiment; the main accommodating chamber 2 and the auxiliary accommodating chamber 3 are both regular shaped cavities, and in this embodiment, they are both cylindrical cavity structures, and the bottom wall of the auxiliary accommodating chamber 3, that is, the side wall of the auxiliary accommodating chamber 3 away from the second valve port 6; the first valve port 5 and the second valve port 6 are both regular shaped openings, such as circular openings; the main gas path 7 and the auxiliary gas path 8 are both used to transport gas. In summary, in this embodiment, the input channel 1 is divided into two paths at the first position 4, one path enters the main gas path 7 through the main accommodating chamber 2, and the other path enters the auxiliary gas path 8 through the auxiliary accommodating chamber 3.

[0025] The first piston 11 and the second piston 12 are both of regular shape, such as cylindrical; the structure of the first piston 11 and the second piston 12 can also adopt the structure known in the prior art; the first piston 11 cuts off the first valve port 5, that is, the surface of the first piston 11 on one side facing the first valve port 5 contacts with the structure enclosing the first valve port 5, thereby blocking the first valve port 5. Preferably, in this embodiment, in order to maintain good air tightness after the first piston 11 cuts off the first valve port 5, a first rubber pad 25 is further provided on the side of the first piston 11 facing the first valve port 5. The first rubber pad 25 is made of a flexible material, and is elastically deformed during the process of the first piston 11 contacting with the structure enclosing the first valve port 5. The elastically deformed part of the first rubber pad 25 wraps the structure enclosing the first valve port 5, so that the air tightness is higher when the first valve port 5 is cut off.

[0026] Correspondingly, the first piston 11 opens the first valve port 5 , that is, a side surface of the first piston 11 facing the first valve port 5 is separated from the structure enclosing the first valve port 5 , thereby opening the first valve port 5 .

[0027] The structure of the second piston 12 and the principle of cutting off the second valve port 6 are similar to those of the first piston 12 and are not described in detail here.

[0028] The first piston 11 of the piston assembly 9 is slidably sealed with the main accommodating chamber 2, and can be sealed by one of the structural methods in the prior art. For example, in this embodiment, a first sealing ring is sleeved on the outer surface of the first piston 11, and the first piston 11 is slidably sealed with the inner wall of the main accommodating chamber 2 through the first sealing ring.

[0029] The first branch 14 is a small branch gas path. If the first branch 14 is conducted, the gas pressure flowing inside it can overcome the elastic force of the first spring 13, pushing the first piston 11, the connecting rod 10, and the second piston 12 to move downward until the first piston 11 cuts off the first valve port 5 and the second piston 12 opens the second valve port 6; if the first branch 14 is cut off, then under the elastic force of the first spring 13, the first piston 11, the connecting rod 10, and the second piston 12 move upward until the first piston 11 opens the first valve port 5 and the second piston 12 cuts off the second valve port 6.

[0030] The structure of the pilot solenoid valve 15 is prior art and can be found in the prior art, so it will not be described in detail here.

[0031] As can be seen from the background technology, the rail vehicle air source system has a main air circuit and an auxiliary air circuit. According to the different air sources required by the train, the main air circuit and the auxiliary air circuit need to switch with each other; in the prior art, if you want to achieve the switching of the main air circuit and the auxiliary air circuit, that is, from the main air circuit open and the auxiliary air circuit closed, to the main air circuit closed and the auxiliary air circuit opened, or from the main air circuit closed and the auxiliary air circuit opened, to the main air circuit opened and the auxiliary air circuit closed, at least two solenoid valves are required, one of which controls the opening and closing of the main air circuit, and the other controls the opening and closing of the auxiliary air circuit, which leads to the high investment cost on the solenoid valve in the prior art. Therefore, the technical problem existing in the prior art is that it is urgent to propose a multi-way switching solenoid valve body, which only needs to use one solenoid valve to achieve the switching of the main air circuit and the auxiliary air circuit.

[0032] In this embodiment, the switching of the main gas path 7 and the auxiliary gas path 8 depends on the up and down movement of the piston assembly 9, and the up and down movement of the piston assembly 9 depends on the opening and closing of the pilot solenoid valve 15; specifically, the pilot solenoid valve 15 is opened, and the gas acts on the upper surface of the first piston 11 through the input channel 1 and the first branch 14, thereby causing the piston assembly 9 to move downward, that is, the main accommodating chamber 2 moves in the direction of the auxiliary accommodating chamber 3, the first spring 13 is compressed, the first piston 11 cuts off the first valve port 5, and the second piston 12 opens the second valve port 6; the pilot solenoid valve 15 is closed, and the first branch 14 acts on the upper surface of the first piston 11 through the input channel 1 and the first branch 14, thereby causing the piston assembly 9 to move downward, that is, the main accommodating chamber 2 moves in the direction of the auxiliary accommodating chamber 3, the first spring 13 is compressed, the first piston 11 cuts off the first valve port 5, and the second piston 12 opens the second valve port 6; 4 is cut off, and there is no gas pressure on the upper surface of the first piston 11. The first spring 13 pushes the first piston 11 and the second piston 12 upward under the action of its own elastic force, the first piston 11 opens the first valve port 5, and the second piston 12 cuts off the second valve port 6. In summary, in this embodiment, the switching of the gas path 7 and the auxiliary gas path 8 can be achieved by opening and closing only one solenoid valve, that is, the pilot solenoid valve 15, which solves the technical problems existing in the prior art: it is urgent to propose a multi-way switching solenoid valve body, which only needs to use one solenoid valve to achieve the switching of the main gas path 7 and the auxiliary gas path 8.

[0033] Furthermore, in actual use, the gas in the main gas path 7 is usually output only when the gas pressure reaches a preset pressure, that is, this embodiment should also solve the following technical problem: how to make the gas entering the main gas path be output to the outside of the multi-way switching solenoid valve only when it reaches a preset pressure. In order to achieve this function, this embodiment also includes the following technical solutions:

[0034] like Figure 1 to Figure 3As shown, a limiting chamber 16, a limiting airway 17 and an output airway 18 are also provided in the main body 100. One end of the limiting airway 17 is connected to the first branch 14. The position where the limiting airway 17 is connected to the first branch 14 is located between the input channel 1 and the pilot solenoid valve 15. A section of the limiting airway 17 away from the first branch 14, a section of the output airway 18, and a section of the main airway 7 away from the main accommodating chamber 2 converge at the limiting chamber 16 and form a three-way shape; a limiting valve core assembly 19 is movably provided in the limiting chamber 16, and the limiting valve core assembly 19 includes a core body 20, which is directed from the limiting airway 17 to the direction of the main airway 7, and the core body 20 has an upper section and a lower section, wherein the upper section of the core body 20 is arranged toward the limiting airway 17, and the lower section of the core body 20 The limiting valve core assembly 19 further comprises a compression spring 23, the axial direction of the compression spring 23 is from the limiting air channel 17 to the main air channel 7, the inner wall of the cavity on the side facing the main air channel 7 is provided with a step 22, and the compression spring 21 is used to contact or separate from the step 22, thereby cutting off or connecting the main air channel 7 and the output air channel 18; the limiting valve core assembly 19 also comprises a compression spring 23, the axial direction of the compression spring 23 is from the limiting air channel 17 to the main air channel 7, the inner wall of the cavity on the side away from the step 22 in the limiting cavity 16 is a first inner wall 24, the protrusion 21 is located between the first inner wall 24 and the step 22, one end of the compression spring 23 abuts against the first inner wall 24, and the other end abuts against the protrusion 21.

[0035] The elastic force of the compression spring 23 is a preset elastic force, which is not limited here and can be configured according to specific usage conditions.

[0036] In this embodiment, one end of the limiting air channel 17 is connected to the first branch 14, and one path of gas passes through the input channel 1, the first branch 14, the limiting air channel 17 and finally acts on the upper surface of the core 20; the other path of gas passes through the input channel 1, the main air channel 7 and finally acts on the lower surface of the core 20; if the sum of the force acting on the upper surface of the core 20 and the elastic force of the compression spring 23 is greater than the force acting on the lower surface of the core 20, the core 20 moves downward, the protrusion 21 contacts the step 22, and the main air channel 7 and the output air channel 18 are cut off; conversely, if the sum of the force acting on the upper surface of the core 20 and the elastic force of the compression spring 23 is less than the force acting on the lower surface of the core 20, the core 20 moves upward, that is, the core 20 is lifted by the airflow of the main air channel 7, and the main air channel 7 and the output air channel 18 are connected, and the output gas is used by the vehicle. The sum of the force acting on the upper surface of the core 20 and the elastic force of the compression spring 23 is the above-mentioned preset pressure. Only when the air pressure of the main air path 7 is greater than the preset pressure, the main air path 7 and the output air channel 18 will be connected. In summary, this embodiment solves the technical problem: how to make the gas entering the main air path be output to the outside of the multi-way switching solenoid valve only when the preset pressure is reached.

[0037] Furthermore, in this embodiment, since a limiting valve core assembly 19 is provided, the air pressure of the main air circuit 7 must be greater than the preset pressure before it can be output to the outside, that is, the gas in the main air circuit 7 is continuously restricted in the main air circuit 7 before reaching the preset pressure; if this limiting valve core assembly 19 is not provided, once gas enters the main air circuit 7, it will be immediately output to the external large air storage cylinder, and the air pressure in the main air circuit 7 cannot be increased. Then, when the pilot solenoid valve 15 is energized, the air pressure in the main air circuit 7 is likely to be difficult to push the piston assembly 9 up and down, resulting in incomplete valve switching and the upper and lower valve ports not being tightly closed. Therefore, this embodiment can also avoid the situation that when the pilot solenoid valve 15 is energized, the gas in the main air circuit 7 is output before reaching the preset pressure, the main air circuit 7 continues to release pressure, and the air pressure cannot push the piston assembly 9 up and down, thereby avoiding the failure of switching between the main air circuit 7 and the auxiliary air circuit 8, and the chaotic air flow of the main air circuit 7 and the auxiliary air circuit 8.

[0038] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A multi-way switching solenoid valve body, characterized in that: The invention comprises a body (100), wherein an input channel (1), a main accommodating chamber (2) and a secondary accommodating chamber (3) are arranged in the body (100), wherein the input channel (1), the main accommodating chamber (2) and the secondary accommodating chamber (3) intersect at a first position (4) and form a three-way shape; a first valve port (5) is arranged on the side of the main accommodating chamber (2) facing the first position (4), and a second valve port (6) is arranged on the side of the secondary accommodating chamber (3) facing the first position (4); a main gas path (7) and a secondary gas path (8) are also arranged in the body (100), wherein the main gas path (7) is connected to the main accommodating chamber (2), and the secondary gas path (8) is connected to the secondary accommodating chamber (3); The invention also comprises a piston assembly (9), the piston assembly (9) comprising a connecting rod (10), and a first piston (11) and a second piston (12) arranged on the connecting rod (10), wherein the connecting rod (10) is arranged to pass through the first position (4), and along the extension direction of the connecting rod (10), the first piston (11) and the second piston (12) are respectively located on both sides of the first position (4); the first piston (11) is movably and inseparablely confined in the main accommodating chamber (2), and the side surface of the first piston (11) is in contact with the inner surface of the main accommodating chamber (2). The piston assembly (9) is provided with a wall sliding seal, wherein the first piston (11) is used to cut off or open the first valve port (5), the second piston (12) is movable and inseparable and is confined in the auxiliary accommodation chamber (3), and the second piston (12) is used to cut off or open the second valve port (6); during the movement of the piston assembly (9), the first valve port (5) and the second valve port (6) are selectively opened or selectively cut off; the piston assembly (9) further comprises a first spring (13), and the first spring (13) is arranged between the second piston (12) and the bottom wall of the auxiliary accommodation chamber (3); A first branch (14) is also provided in the body (100), one end of the first branch (14) being in communication with the input channel (1) at the first position (4), and the other end of the first branch (14) being in communication with a portion of the main accommodating chamber (2) located above the first piston (11); It also includes a pilot solenoid valve (15), the shell of the pilot solenoid valve (15) is connected to the body (100), the valve core of the pilot solenoid valve (15) is inserted into the first branch (14), and the pilot solenoid valve (15) is used to cut off or open the first branch (14).

2. The multi-way switching solenoid valve body according to claim 1, characterized in that: A limiting chamber (16), a limiting air passage (17) and an output air passage (18) are also provided in the body (100); one end of the limiting air passage (17) is connected to the first branch (14); the position where the limiting air passage (17) is connected to the first branch (14) is located between the input channel (1) and the pilot solenoid valve (15); a section of the limiting air passage (17) away from the first branch (14), a section of the output air passage (18), and a section of the main air passage (7) away from the main accommodating chamber (2) converge at the limiting chamber (16) to form a three-way shape; A limiting valve core assembly (19) is movably arranged in the limiting chamber (16), the limiting valve core assembly (19) comprising a core body (20), which is directed from the limiting air passage (17) to the main air passage (7), the core body (20) comprising an upper section and a lower section, wherein the upper section of the core body (20) is arranged toward the limiting air passage (17), and the lower section of the core body (20) is arranged toward the main air passage (7), the upper section of the core body (20) is slidably sealed with the air passage inner wall of the limiting air passage (17), a protrusion (21) is arranged on the radial side surface of the lower section of the core body (20), and a step (22) is also arranged on the inner wall of the limiting chamber (16) on the side facing the main air passage (7), the protrusion (21) is used to contact or separate from the step (22), thereby cutting off or connecting the main air passage (7) and the output air passage (18); The limiting valve core assembly (19) further comprises a compression spring (23), the axial direction of the compression spring (23) being from the limiting air passage (17) to the main air passage (7), the inner wall of the limiting chamber (16) on the side away from the step (22) being a first inner wall (24), the protrusion (21) being located between the first inner wall (24) and the step (22), one end of the compression spring (23) being in contact with the first inner wall (24), and the other end being in contact with the protrusion (21).

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