A triple solenoid valve

Abstract

The present invention discloses a triple solenoid valve, including a valve body, wherein a first valve cavity, a second valve cavity and a third valve cavity are respectively provided in the valve body, a first valve stem is provided in the first valve cavity, an air source port, a first exhaust port, a second exhaust port, a first working port and a second working port are respectively provided on the valve body, a first pilot component is provided at one end of the first valve cavity; a second valve stem is provided in the second valve cavity, and a second pilot component and a third pilot component are respectively provided at both ends of the second valve cavity; a third valve stem is provided in the third valve cavity, and a fourth pilot component is provided at one end of the third valve cavity; a first pilot airway matched with the air source port is also provided in the valve body, and the first valve stem controls the on-off of the air path between the air source port and the first pilot airway through a reversing action, and the first pilot airway is used to provide the pilot gas required for reversing to the second pilot component, the third pilot component and the fourth pilot component respectively. The present invention has the advantages of diverse functions, simple and compact structure, convenient and flexible use and high air tightness.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a triple solenoid valve. Background Art

[0002] The doors of buses and public transports are necessary facilities for passengers to get on and off the vehicles. Passengers often stay near the doors when the vehicles are moving and stopping. Therefore, the closure and safety of the doors during the driving and stopping of the vehicles have always been the focus of people's attention. Most of the current doors are driven by air source power, and the door opening and closing is controlled by the door opening and closing system. The system is mainly composed of several single solenoid valves connected to each other. In actual application, there are problems such as relatively troublesome installation and connection, poor air tightness, and relatively single function. Summary of the invention

[0003] The purpose of the present invention is to provide a triple solenoid valve with the advantages of diverse functions, simple and compact structure, convenient and flexible use, and high air tightness in view of the defects and shortcomings of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a triple solenoid valve, including a valve body, wherein a first valve cavity, a second valve cavity and a third valve cavity are respectively provided in the valve body, a first valve stem movable between a first station and a second station is provided in the first valve cavity, an air source port communicating with the first valve cavity is provided on the valve body, and a first pilot component driving the first valve stem to switch direction is provided at one end of the first valve cavity;

[0005] A second valve stem movable between a third position and a fourth position is provided in the second valve cavity, a first exhaust port and a second exhaust port respectively connected to the second valve cavity are provided on the valve body, the second valve cavity is connected to the first valve cavity through a first channel, and a second pilot component and a third pilot component for driving the second valve stem to switch direction are respectively provided at both ends of the second valve cavity;

[0006] The third valve cavity is provided with a third valve stem movable between a fifth position and a sixth position, the valve body is also provided with a first working port and a second working port respectively connected to the third valve cavity, the third valve cavity is connected to the second valve cavity through a second channel, a third channel and a fourth channel respectively, and one end of the third valve cavity is provided with a fourth pilot component for driving the third valve stem to change direction;

[0007] The valve body is also provided with a first pilot air passage cooperating with the air source port, and the first valve stem controls the on-and-off of the air path between the air source port and the first pilot air passage through a switching action, and the first pilot air passage is used to provide the pilot air required for switching to the second pilot component, the third pilot component and the fourth pilot component respectively.

[0008] Furthermore, a second pilot air passage is provided in the valve body, the second pilot air passage is communicated with the air source port, and the second pilot air passage provides the first pilot component with pilot air required for switching.

[0009] Furthermore, the first pilot assembly includes a first pilot seat and a first coil assembly, a first pilot cavity corresponding to the end of the first valve stem is provided in the first pilot seat, the first pilot cavity is connected to the second pilot airway, a first valve port is provided between the first pilot cavity and the second pilot airway, and the first coil assembly is used to open and close the first valve port.

[0010] Furthermore, the second pilot assembly includes a second pilot seat and a second coil assembly, the second pilot seat is provided with a third pilot cavity corresponding to one end of the second valve stem, the third pilot cavity is connected to the first pilot airway, a second valve port is provided between the third pilot cavity and the first pilot airway, and the second coil assembly is used to open and close the second valve port.

[0011] Furthermore, a first cover plate is protruding from the second pilot seat, the first cover plate is covered on the other end of the third valve cavity, and a fifth pilot cavity connected with the third pilot cavity is disposed in the first cover plate.

[0012] Furthermore, the third pilot assembly includes a third pilot seat and a third coil assembly, the third pilot seat is provided with a fourth pilot cavity corresponding to the other end of the second valve stem, the fourth pilot cavity is connected to the first pilot airway, a third valve port is provided between the fourth pilot cavity and the first pilot airway, and the third coil assembly is used to open and close the third valve port.

[0013] Furthermore, a second cover plate is protruding from the third pilot seat, the second cover plate is covered on the other end of the first valve cavity, and a second pilot cavity communicating with the second pilot airway is disposed in the second cover plate.

[0014] Furthermore, the fourth pilot assembly includes a fourth pilot seat and a fourth coil assembly, the fourth pilot seat is provided with a sixth pilot cavity corresponding to the end of the third valve stem, the sixth pilot cavity is connected to the first pilot airway, a fourth valve port is provided between the sixth pilot cavity and the first pilot airway, and the fourth coil assembly is used to open and close the fourth valve port.

[0015] Furthermore, the first valve stem, the second valve stem and the third valve stem are respectively sleeved with a plurality of spacers, and flat rings are provided between adjacent spacers to improve sealing performance and avoid air cross-talk.

[0016] Furthermore, pistons are respectively provided at the ends of the first valve stem, the second valve stem and the third valve stem, so that the corresponding valve stems can be switched more quickly.

[0017] The beneficial effects of the present invention are as follows: firstly, by providing a first valve cavity, a second valve cavity and a third valve cavity in the valve body, providing a first valve stem, a second valve stem and a third valve stem corresponding to the first valve cavity and providing a pilot assembly correspondingly, the three valves are reasonably and cleverly arranged together, so that the connection is convenient, the structure is simple and compact, and the sealing performance is improved;

[0018] Secondly, by providing a first pilot air passage cooperating with the air source port in the valve body, the first valve stem controls the on-off of the air path between the air source port and the first pilot air passage through a reversing action, and the first pilot air passage is used to provide the pilot air required for reversing to the second pilot assembly, the third pilot assembly and the fourth pilot assembly respectively. When the first pilot air passage is disconnected, the second pilot assembly, the third pilot assembly and the fourth pilot assembly have no pilot air, so that the corresponding second valve stem and the third valve stem cannot be reversing, and the gas can only be output from the second working port. When the valve is used in a vehicle door, the vehicle is controlled to be securely closed when the vehicle is driving at high speed, which is safe and reliable.

[0019] Thirdly, by energizing or de-energizing the second pilot component, the third pilot component and the fourth pilot component, the vehicle door corresponding to the valve can be quickly opened and closed, so that the vehicle door can be flexibly switched between various states, which is easy to use; in general, the present invention has the advantages of diverse functions, simple and compact structure, convenient and flexible use, and high air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axial schematic diagram of the present invention.

[0021] Figure 2 It is a cutaway schematic diagram of the present invention.

[0022] Figure 3 It is a schematic cross-sectional view of the present invention in another direction.

[0023] Figure 4 It is a schematic diagram cut along the first valve cavity in the present invention.

[0024] Figure 5 It is a schematic diagram cut along the second valve cavity in the present invention.

[0025] Figure 6 It is a schematic diagram cut along the third valve cavity in the present invention.

[0026] As shown in the figure: 1-valve body; 1.1-first valve cavity; 1.2-second valve cavity; 1.3-third valve cavity; 1.4-gas source port; 1.5-first exhaust port; 1.6-second exhaust port; 1.7-first channel; 1.8-first working port; 1.9-second working port; 1.10-second channel; 1.11-third channel; 1.12-fourth channel; 1.13-first pilot airway; 1.14-second pilot airway; 2-first valve stem; 3-second valve stem; 4-third valve stem; 5-first pilot seat; 5.1-first pilot cavity; 5.2-first valve port; 6-first coil assembly; 7-second pilot seat; 7.1-third pilot cavity; 7.2-second valve port; 7.3-starting port; 7.4-starting chamber; 71-first cover plate; 72-first manual button; 73-first push rod; 71.1-fifth pilot chamber; 8-second coil assembly; 9-third pilot seat; 9.1-fourth pilot chamber; 9.2-third valve port; 91-second cover plate; 91.1-second pilot chamber; 92-second manual button; 10-third coil assembly; 11-fourth pilot seat; 11.1-sixth pilot chamber; 11.2-fourth valve port; 11.3-emergency port; 11.4-emergency chamber; 111-second push rod; 12-fourth coil assembly; 13-spacer; 14-flat ring; 15-piston. DETAILED DESCRIPTION

[0027] In order to more intuitively and completely understand the technical solution of the present invention, a non-limiting feature description is now provided in conjunction with the accompanying drawings of the present invention as follows:

[0028] like Figures 1 to 6 As shown, a triple solenoid valve comprises a valve body 1, wherein a first valve chamber 1.1, a second valve chamber 1.2 and a third valve chamber 1.3 are respectively provided in the valve body 1, a first valve stem 2 movable between a first position and a second position is provided in the first valve chamber 1.1, an air source port 1.4 communicating with the first valve chamber 1.1 is provided on the valve body 1, and a first pilot component driving the first valve stem 2 to switch direction is provided at one end of the first valve chamber 1.1;

[0029] A second valve stem 3 is provided in the second valve chamber 1.2 and can move between the third position and the fourth position. A first exhaust port 1.5 and a second exhaust port 1.6 are provided on the valve body 1 and are respectively connected to the second valve chamber 1.2. The second valve chamber 1.2 is connected to the first valve chamber 1.1 through a first passage 1.7. A second pilot component and a third pilot component are respectively provided at both ends of the second valve chamber 1.2 for driving the second valve stem 3 to change direction.

[0030] A third valve stem 4 is provided in the third valve chamber 1.3 and can move between the fifth position and the sixth position. A first working port 1.8 and a second working port 1.9 are provided on the valve body 1 and are respectively connected to the third valve chamber 1.3. The third valve chamber 1.3 is connected to the second valve chamber 1.2 through a second channel 1.10, a third channel 1.11 and a fourth channel 1.12, respectively. A fourth pilot component for driving the third valve stem 4 to change direction is provided at one end of the third valve chamber 1.3.

[0031] A first pilot air passage 1.13 cooperating with the air source port 1.4 is also provided in the valve body 1. The first valve stem 2 controls the on-off of the air path between the air source port 1.4 and the first pilot air passage 1.13 through a reversing action. The first pilot air passage 1.13 is used to provide the pilot air required for reversing to the second pilot assembly, the third pilot assembly and the fourth pilot assembly respectively.

[0032] Specifically, the first working port 1.8 and the second working port 1.9 are respectively connected to the rod chamber and the rodless chamber of the cylinder; when the first working port 1.8 releases air, the piston of the cylinder is in a retracted state, and the connected door is in a closed state, and when the second working port 1.9 releases air, the piston of the cylinder is in an extended state, and the connected door is in an open state; the first exhaust port 1.5 and the second exhaust port 1.6 are connected to the atmosphere, and silencers are installed in the first exhaust port 1.5 and the second exhaust port 1.6 to reduce noise and optimize the working environment.

[0033] A second pilot air passage 1.14 is also provided in the valve body 1, and the second pilot air passage 1.14 is connected to the air source port 1.4, and the second pilot air passage 1.14 provides the first pilot assembly with pilot air required for switching.

[0034] The first pilot assembly includes a first pilot seat 5 and a first coil assembly 6. A first pilot cavity 5.1 corresponding to the end of the first valve stem 2 is provided in the first pilot seat 5. The first pilot cavity 5.1 is connected to the second pilot airway 1.14. A first valve port 5.2 is provided between the first pilot cavity 5.1 and the second pilot airway 1.14. The first coil assembly 6 is used to open and close the first valve port 5.2.

[0035] The second pilot assembly comprises a second pilot seat 7 and a second coil assembly 8. A third pilot cavity 7.1 corresponding to one end of the second valve stem 3 is provided in the second pilot seat 7. The third pilot cavity 7.1 is communicated with the first pilot airway 1.13. A second valve port 7.2 is provided between the third pilot cavity 7.1 and the first pilot airway 1.13. The second coil assembly 8 is used for opening and closing the second valve port 7.2.

[0036] A first cover plate 71 is protruded from the second pilot seat 7, and the first cover plate 71 covers the other end of the third valve chamber 1.3. A fifth pilot chamber 71.1 connected to the third pilot chamber 7.1 is provided in the first cover plate 71; it is worth mentioning that when gas is introduced into the third pilot chamber 7.1, gas is also introduced into the fifth pilot chamber 71.1, and when the third valve stem 4 is located in the fifth position, the piston 15 in the fifth pilot chamber 71.1 will force the third valve stem 4 to move from the fifth position to the sixth position.

[0037] The third pilot assembly includes a third pilot seat 9 and a third coil assembly 10. A fourth pilot cavity 9.1 corresponding to the other end of the second valve stem 3 is provided in the third pilot seat 9. The fourth pilot cavity 9.1 is connected to the first pilot airway 1.13. A third valve port 9.2 is provided between the fourth pilot cavity 9.1 and the first pilot airway 1.13. The third coil assembly 10 is used for opening and closing the third valve port 9.2.

[0038] A second cover plate 91 is protrudingly provided on the third pilot seat 9. The second cover plate 91 covers the other end of the first valve cavity 1.1. A second pilot cavity 91.1 communicating with the second pilot airway 1.14 is provided in the second cover plate 91.

[0039] Specifically, a first manual button 72 is provided on the second pilot seat 7, and the first manual button 72 is arranged corresponding to the moving iron core in the second coil assembly 8. A spring is arranged between the first manual button 72 and the second pilot seat 7, and the spring drives the first manual button 72 away from the moving iron core at this location. When the first manual button 72 is pressed and the elastic force of the spring at this location is overcome, the moving iron core at this location is pushed, thereby opening the second valve port 7.2 (at this time, pilot gas is input into the third pilot chamber 7.1), so that the second valve stem 3 moves from the third position to the fourth position;

[0040] A starting port 7.3 is provided on the second pilot seat 7, and a starting chamber 7.4 is provided between the starting port 7.3 and the second valve port 7.2. A first push rod 73 is slidably provided in the starting chamber 7.4. The first push rod 73 is provided corresponding to the moving iron core in the second coil assembly 8. A spring is provided between the first push rod 73 and the second pilot seat 7, and the spring drives the first push rod 73 away from the moving iron core here. The starting port 7.3 is connected to the air source. When gas is introduced into the starting port 7.3, the first push rod 73 overcomes the elastic force of the moving iron core here, and pushes the moving iron core here, and opens the second valve port 7.2 (at this time, pilot gas is input into the third pilot chamber 7.1). As a result, the second valve stem 3 moves from the third station to the fourth station.

[0041] Specifically, a second manual button 92 is provided on the third pilot seat 9, and the second manual button 92 is arranged corresponding to the moving iron core in the third coil assembly 10. A spring is provided between the second manual button 92 and the third pilot seat 9, and the spring drives the second manual button 92 away from the moving iron core here. When the second manual button 92 is pressed and the elastic force of the spring here is overcome, the moving iron core here is pushed, thereby opening the third valve port 9.2 (at this time, pilot gas is input in the fourth pilot chamber 9.1), so that the second valve stem 3 moves from the fourth station to the third station.

[0042] The fourth pilot assembly includes a fourth pilot seat 11 and a fourth coil assembly 12. A sixth pilot cavity 11.1 corresponding to the end of the third valve stem 4 is provided in the fourth pilot seat 11. The sixth pilot cavity 11.1 is connected to the first pilot airway 1.13. A fourth valve port 11.2 is provided between the sixth pilot cavity 11.1 and the first pilot airway 1.13. The fourth coil assembly 12 is used to open and close the fourth valve port 11.2.

[0043] Specifically, an emergency port 11.3 is provided on the fourth pilot seat 11, and an emergency chamber 11.4 is provided between the emergency port 11.3 and the fourth valve port 11.2. A second push rod 111 is slidably provided in the emergency chamber 11.4. The second push rod 111 is correspondingly provided to the moving iron core in the fourth coil assembly 12. A spring is provided between the second push rod 111 and the fourth pilot seat 11, and the spring drives the second push rod 111 away from the moving iron core here. The emergency port 11.3 is connected to the gas source. When gas is introduced into the emergency port 11.3, the second push rod 111 overcomes the elastic force of the moving iron core here, and pushes the moving iron core here, and opens the fourth valve port 11.2 (at this time, pilot gas is input into the sixth pilot chamber 11.1). As a result, the third valve stem 4 moves from the sixth station to the fifth station.

[0044] It should be noted that the specific structure of the manual button involved above can refer to the multi-control reversing valve and valve assembly disclosed in Chinese patent application number CN201721526492.3, or refer to a two-position five-way solenoid valve disclosed in Chinese patent application number CN201721376491.5, which will not be described one by one here.

[0045] A plurality of spacers 13 are sleeved on the first valve stem 2, the second valve stem 3 and the third valve stem 4, respectively, and a flat ring 14 is arranged between adjacent spacers 13; pistons 15 are arranged at the ends of the first valve stem 2, the second valve stem 3 and the third valve stem 4, respectively.

[0046] Preferably, the valve body 1 is composed of a valve body A and a valve body B, and the valve body B is fixed to the valve body A by screws. A sealing gasket is provided between the valve body A and the valve body B to ensure the relative sealing of the second channel 1.10, the third channel 1.11 and the fourth channel 1.12 to avoid gas leakage. The first valve chamber 1.1 and the second valve chamber 1.2 are both opened in the valve body A, and the third valve chamber 1.3 is opened on the valve body B, which is convenient for processing and manufacturing and easy to install.

[0047] It should be noted that if Figure 2 As shown, when the first valve stem 2 is located on the left side of the first valve chamber 1.1, it is the first working position; when the first valve stem 2 is located on the right side of the first valve chamber 1.1, it is the second working position; when the second valve stem 3 is located on the left side of the second valve chamber 1.2, it is the third working position; when the second valve stem 3 is located on the right side of the second valve chamber 1.2, it is the fourth working position; when the third valve stem 4 is located on the left side of the third valve chamber 1.3, it is the fifth working position; when the third valve stem 4 is located on the right side of the third valve chamber 1.3, it is the sixth working position; under normal circumstances, the first valve stem 2 is located in the first working position, the second valve stem 3 is located in the third working position, and the third valve stem 4 is located in the sixth working position. At this time, the gas flows out from the first working port 1.8, the corresponding cylinder is in the retracted state, and the connected car door is in the closed state.

[0048] The specific working principle of the present invention is as follows: when applied to a vehicle door system, under normal circumstances, the first valve stem 2 is located at the first position, the second valve stem 3 is located at the third position, and the third valve stem 4 is located at the sixth position. The first valve chamber 1.1 is in a connected state with the first pilot air channel 1.13 and the second pilot air channel 1.14. The air source port 1.4 directly delivers pilot air to the first to sixth pilot chambers respectively. At this time, the vehicle door remains closed. The gas from the air source port 1.4 passes through the first valve chamber 1.1, the first channel 1.7, the second valve chamber 1.2, the second channel 1.10, and the third valve chamber 1.3 in sequence, and finally flows out from the first working port 1.8, so that the piston in the cylinder retracts and keeps the vehicle door closed, and the gas in the cylinder is discharged from the second working port 1.9, the third valve chamber 1.3, the fourth channel 1.12, and the second valve chamber 1.2 in sequence, and finally from the second exhaust port 1.6.

[0049] When the corresponding door needs to be opened, the second coil assembly 8 is energized or gas is passed into the start port 7.3 or the first manual button 72 is pressed, so that the second valve port 7.2 is opened, and the third pilot chamber 7.1 is filled with gas, so that the corresponding piston 15 pushes the second valve stem 3 to move from the third position to the fourth position, and the gas from the gas source port 1.4 passes through the first valve chamber 1.1, the first channel 1.7, the second valve chamber 1.2, the fourth channel 1.12 and the third valve chamber 1.3 in sequence, and finally flows out from the second working port 1.9, so that the gas The piston of the cylinder extends and opens the door. At this time, the gas in the cylinder is discharged from the first working port 1.8, the third valve chamber 1.3, the second channel 1.10 and the second valve chamber 1.2 in sequence, and finally from the first exhaust port 1.5. When the door needs to be closed, the third coil assembly 10 can be energized or the second manual button 92 can be pressed, both of which can open the third valve port 9.2 and fill the fourth pilot chamber 9.1 with gas, so that the corresponding piston 15 pushes the second valve stem 3 from the fourth position to the third position, and the gas flow direction is the same as in the normal state;

[0050] When an emergency occurs or the door needs to be stopped, the fourth coil assembly 12 can be powered or gas can be introduced into the emergency port 11.3, both of which can open the fourth valve port 11.2, so that the corresponding piston 15 pushes the third valve stem 4 to move from the sixth position to the fifth position, and the gas from the gas source port 1.4 passes through the first valve chamber 1.1, the first channel 1.7, the second valve chamber 1.2, the third channel 1.11 and the third valve chamber 1.3 in sequence, and finally flows out from the first working port 1.8 and the second working port 1.9 respectively, so that the two ends of the piston of the cylinder remain relatively balanced, so that the door stops moving;

[0051] When the first coil assembly 6 is energized, the first valve port 5.2 can be opened, so that the corresponding piston 15 pushes the first valve stem 2 to move from the first position to the second position, the first pilot airway 1.13 is closed, and there is no pilot gas in the third to sixth pilot chambers to drive the corresponding valve stems to change direction. At this time, the second to fourth coil assemblies 12 are energized or the corresponding manual buttons are actuated or gas is introduced into the start port 7.3 and the emergency port 11.3, and the corresponding second valve stem 3 and the third valve stem 4 are not changed, and the gas in the gas source port 1.4 flows out from the first working port 1.8 through the valve body 1, so that the corresponding door remains closed. When the corresponding vehicle is traveling at high speed, the door is securely closed to maintain the safety of the people in the vehicle.

[0052] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A triple solenoid valve, characterized in that: The invention comprises a valve body (1), wherein a first valve chamber (1.1), a second valve chamber (1.2) and a third valve chamber (1.3) are respectively provided in the valve body (1), a first valve stem (2) movable between a first position and a second position is provided in the first valve chamber (1.1), an air source port (1.4) communicating with the first valve chamber (1.1) is provided on the valve body (1), and a first pilot component for driving the first valve stem (2) to change direction is provided at one end of the first valve chamber (1.1); A second valve stem (3) movable between a third position and a fourth position is provided in the second valve chamber (1.2); a first exhaust port (1.5) and a second exhaust port (1.6) respectively connected to the second valve chamber (1.2) are provided on the valve body (1); the second valve chamber (1.2) is connected to the first valve chamber (1.1) via a first channel (1.7); a second pilot component and a third pilot component for driving the second valve stem (3) to switch direction are respectively provided at two ends of the second valve chamber (1.2); A third valve stem (4) movable between a fifth position and a sixth position is provided in the third valve chamber (1.3); a first working port (1.8) and a second working port (1.9) respectively connected to the third valve chamber (1.3) are provided on the valve body (1); the third valve chamber (1.3) and the second valve chamber (1.2) are respectively connected via a second channel (1.10), a third channel (1.11) and a fourth channel (1.12); a fourth pilot component for driving the third valve stem (4) to change direction is provided at one end of the third valve chamber (1.3); A first pilot air passage (1.13) cooperating with the air source port (1.4) is further provided in the valve body (1); the first valve stem (2) controls the on-off of the air path between the air source port (1.4) and the first pilot air passage (1.13) through a reversing action; the first pilot air passage (1.13) is used to respectively provide pilot air required for reversing to the second pilot assembly, the third pilot assembly and the fourth pilot assembly.

2. A triple solenoid valve according to claim 1, characterized in that: A second pilot air passage (1.14) is also provided in the valve body (1), the second pilot air passage (1.14) being in communication with the air source port (1.4), and the second pilot air passage (1.14) providing the first pilot component with pilot air required for switching.

3. A triple solenoid valve according to claim 2, characterized in that: The first pilot assembly comprises a first pilot seat (5) and a first coil assembly (6); a first pilot cavity (5.1) corresponding to the end of the first valve stem (2) is provided in the first pilot seat (5); the first pilot cavity (5.1) is communicated with the second pilot airway (1.14); a first valve port (5.2) is provided between the first pilot cavity (5.1) and the second pilot airway (1.14); and the first coil assembly (6) is used for opening and closing the first valve port (5.2).

4. A triple solenoid valve according to claim 1, characterized in that: The second pilot assembly comprises a second pilot seat (7) and a second coil assembly (8); a third pilot cavity (7.1) corresponding to one end of the second valve stem (3) is provided in the second pilot seat (7); the third pilot cavity (7.1) is communicated with the first pilot airway (1.13); a second valve port (7.2) is provided between the third pilot cavity (7.1) and the first pilot airway (1.13); and the second coil assembly (8) is used for opening and closing the second valve port (7.2).

5. A triple solenoid valve according to claim 4, characterized in that: A first cover plate (71) is protruding from the second pilot seat (7), the first cover plate (71) covers the other end of the third valve cavity (1.3), and a fifth pilot cavity (71.1) communicating with the third pilot cavity (7.1) is provided in the first cover plate (71).

6. A triple solenoid valve according to claim 2, characterized in that: The third pilot assembly comprises a third pilot seat (9) and a third coil assembly (10); a fourth pilot cavity (9.1) corresponding to the other end of the second valve stem (3) is provided in the third pilot seat (9); the fourth pilot cavity (9.1) is communicated with the first pilot airway (1.13); a third valve port (9.2) is provided between the fourth pilot cavity (9.1) and the first pilot airway (1.13); and the third coil assembly (10) is used for opening and closing the third valve port (9.2).

7. A triple solenoid valve according to claim 6, characterized in that: A second cover plate (91) is protruding from the third pilot seat (9), the second cover plate (91) covers the other end of the first valve cavity (1.1), and a second pilot cavity (91.1) communicating with the second pilot airway (1.14) is provided in the second cover plate (91).

8. A triple solenoid valve according to claim 1, characterized in that: The fourth pilot assembly comprises a fourth pilot seat (11) and a fourth coil assembly (12); a sixth pilot cavity (11.1) corresponding to the end of the third valve stem (4) is provided in the fourth pilot seat (11); the sixth pilot cavity (11.1) is communicated with the first pilot airway (1.13); a fourth valve port (11.2) is provided between the sixth pilot cavity (11.1) and the first pilot airway (1.13); and the fourth coil assembly (12) is used for opening and closing the fourth valve port (11.2).

9. A triple solenoid valve according to any one of claims 1 to 8, characterized in that: The first valve stem (2), the second valve stem (3) and the third valve stem (4) are each sleeved with a plurality of spacers (13), and flat rings (14) are provided between adjacent spacers (13).

10. A triple solenoid valve according to claim 9, characterized in that: The ends of the first valve stem (2), the second valve stem (3) and the third valve stem (4) are each correspondingly provided with a piston (15).

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