Two-position three-way electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, and discloses a two-position three-way electromagnetic valve which comprises a valve body and a piston, the valve body comprises an upper valve body and a lower valve body, one side of the upper valve body is provided with an air source connector, the two sides of the lower valve body are provided with an air port and a working port respectively, a piston cavity is formed between the upper valve body and the lower valve body, and the piston cavity is communicated with the air source connector. The ventilation opening is communicated with the piston cavity through a first channel, and the working opening is communicated with the piston cavity through a second channel; the piston comprises a vertical part and a horizontal part which are integrally formed, the vertical part is in vertical sliding fit with the upper valve body, the horizontal part is located in the piston cavity, a spring is arranged between the horizontal part and the lower valve body, and the piston is provided with an air flow channel in an up-down penetrating mode. According to the two-position three-way electromagnetic valve, the problem that the coil power, the working pressure and the flow of the valve cannot be obtained at the same time in an existing two-position three-way valve is solved.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a two-position three-way solenoid valve. Background Art

[0002] The existing two-position three-way valve, whether direct-acting or pilot-operated, must overcome the medium pressure to move the valve core, which increases the resistance of the valve core movement. To ensure the normal operation of the valve, either the solenoid power is increased, resulting in a significant reduction in the life of the device, or the valve core stroke is reduced, sacrificing the flow rate, resulting in the coil power, valve working pressure and flow rate cannot be achieved at the same time. Summary of the invention

[0003] The object of the present invention is to provide a two-position three-way solenoid valve to solve at least one of the above problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A two-position three-way solenoid valve, comprising a valve body and a piston, the valve body comprising an upper valve body and a lower valve body, one side of the upper valve body is provided with an air source interface, two sides of the lower valve body are respectively provided with a vent and a working port, a piston cavity is provided between the upper valve body and the lower valve body, the vent is communicated with the piston cavity through a first channel, and the working port is communicated with the piston cavity through a second channel;

[0006] The piston includes an integrally formed vertical portion and a horizontal portion, the vertical portion vertically slidingly cooperates with the upper valve body, the horizontal portion is located in the piston cavity, a spring is provided between the horizontal portion and the lower valve body, an air flow channel is provided through the piston from top to bottom, when the piston is in an upward state, the upper end of the air flow channel is sealed, the air vent and the working port are connected through the piston cavity, when the piston is in a downward state, the first channel is sealed, and the air source interface is connected with the working port through the air flow channel.

[0007] This technical solution has the following advantages:

[0008] 1. In terms of conduction capacity, traditional valve cores all adopt a solid structure, and an air path is made between the solid valve core and the valve body, and the path is small. In this technical solution, the vertical part of the piston is equivalent to the valve core, and an air flow channel is set up from top to bottom. The valve core is set as a hollow structure, and the hollow part is the air path. The piston and the air path are integrated on the valve core. Compared with making an air path around the valve core, the hollow valve core has a larger path, a stronger conduction capacity, and a simple internal air path, and small resistance to gas.

[0009] 2. In terms of back pressure resistance, the vertical part (valve core) in this technical solution is subjected to gas pressure perpendicular to the direction of movement. Compared with the traditional valve core subjected to gas pressure along the direction of movement, this design has smaller movement resistance and faster response, and reduces the spring force used for seal reset, so that the force that the spring should bear is transferred to the vertical part (valve core) pipe wall, so that the coil power, valve working pressure and flow rate can be achieved at the same time.

[0010] 3. In terms of starting pressure difference, the setting of the horizontal part of the technical solution makes the horizontal area of ​​the piston larger, and it can be started under a lower pressure difference.

[0011] 4. In terms of volume, this technical solution integrates the piston, valve core, piston chamber and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and is easy to process.

[0012] Furthermore, in order to provide a pilot structure that facilitates the downward drive of the piston without increasing the power of the electromagnet, the upper valve body is connected to the pilot solenoid through a pilot solenoid mounting position, and a first pilot channel and a second pilot channel are provided on the upper valve body. The two ends of the first pilot channel are respectively connected to the air source interface and the pilot solenoid mounting position, and the two ends of the second pilot channel are respectively connected to the pilot solenoid mounting position and the piston chamber.

[0013] Furthermore, an air inlet sealing structure is provided between the upper end of the piston and the upper valve body, and an air outlet sealing structure is provided between the lower end of the piston and the lower valve body. When the high-pressure air source interface is connected to the working port, it can be self-sealed, thereby enhancing the sealing performance and preventing leakage.

[0014] Furthermore, in order to facilitate the setting of the air inlet sealing structure and the air outlet sealing structure, an air inlet sealing ring is provided on the upper valve body just above the vertical part, and an air outlet sealing ring is provided on the lower valve body just below the horizontal part.

[0015] Furthermore, in order to increase the reliability of the end face sealing at the upper and lower ends of the piston, the upper and lower ends of the piston are respectively provided with an upper sealing end and a lower sealing end with a triangular cross-section. When the upper end of the piston is in a sealed state, the upper sealing end abuts against the air inlet sealing ring, and when the lower end of the piston is in a sealed state, the lower sealing end abuts against the air outlet sealing ring.

[0016] Furthermore, in order to better achieve conduction between the air source interface and the air flow channel, an air inlet cavity is provided on the upper valve body, the air inlet cavity is communicated with the air source interface, and the upper end of the vertical portion is located in the air inlet cavity.

[0017] Furthermore, in order to facilitate the installation of the spring, a spring groove is provided on the lower valve body, the spring is arranged in the spring groove, and the spring groove is coaxially arranged with the piston cavity.

[0018] Furthermore, in order to facilitate the forming of the piston cavity, a piston groove is formed on one side of the upper valve body close to the lower valve body, and a piston cavity is formed between the piston groove and the lower valve body.

[0019] Furthermore, in order to facilitate the setting of the interface, the air source interface and the vent are located on the same side of the valve body.

[0020] Furthermore, in order to improve the sealing effect, a valve stem sealing ring is provided between the vertical portion and the upper valve body, and a piston sealing ring is provided on the horizontal portion.

[0021] The beneficial effects of the present invention are as follows: 1. In terms of conduction capacity, the traditional valve core adopts a solid structure, and the air path is made between the solid valve core and the valve body, and the path is small. In the present technical solution, the vertical part of the piston is equivalent to the valve core, and an air flow channel is set up and down. The valve core is set as a hollow structure, and the hollow part is the air path. The piston and the air path are integrated on the valve core. Compared with the air path around the valve core, the hollow valve core has a larger path and stronger conduction capacity, and the internal air path is simple and has small resistance to gas. 2. In terms of back pressure bearing, the vertical part (valve core) in the present technical solution is subjected to gas pressure perpendicular to the direction of movement. Compared with the traditional valve core subjected to gas pressure along the direction of movement, the present design has smaller movement resistance and faster response, reduces the spring force for sealing reset, and transfers the force that the spring should bear to the vertical part (valve core) tube wall, so that the coil power, valve working pressure and flow rate are achieved. 3. In terms of starting pressure difference, the setting of the horizontal part of the present technical solution makes the piston have a larger horizontal area, which can be started at a lower pressure difference. 4. In terms of volume, this technical solution integrates the piston, valve core, piston chamber and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and is easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a side view structural schematic diagram of the present invention;

[0024] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0025] Figure 4 It is a structural schematic diagram of the valve body part in the present invention.

[0026] In the figure: upper valve body 1; lower valve body 2; air source interface 3; vent 4; working port 5; piston chamber 6; first channel 7; second channel 8; vertical portion 9; horizontal portion 10; spring 11; air flow channel 12; air inlet sealing ring 13; air outlet sealing ring 14; upper sealing end 15; lower sealing end 16; air inlet chamber 17; spring groove 18; valve stem sealing ring 19; piston sealing ring 20; pilot solenoid mounting position 21; pilot solenoid 22; first pilot channel 23; second pilot channel 24. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0028] Embodiment 1:

[0029] like Figure 1-Figure 4 As shown, this embodiment provides a two-position three-way solenoid valve, including a valve body and a piston, the valve body including an upper valve body 1 and a lower valve body 2, a gas source interface 3 is provided on one side of the upper valve body 1, a vent 4 and a working port 5 are provided on both sides of the lower valve body 2, a piston cavity 6 is provided between the upper valve body 1 and the lower valve body 2, the vent 4 is communicated with the piston cavity 6 through a first channel 7, and the working port 5 is communicated with the piston cavity 6 through a second channel 8;

[0030] The piston includes an integrally formed vertical portion 9 and a horizontal portion 10. The vertical portion 9 is vertically slidably matched with the upper valve body 1. The horizontal portion 10 is located in the piston cavity 6. A spring 11 is provided between the horizontal portion 10 and the lower valve body 2. An air flow channel 12 is provided through the piston from top to bottom. When the piston is in an upward state, the upper end of the air flow channel 12 is sealed, and the air vent 4 and the working port 5 are connected through the piston cavity 6. When the piston is in a downward state, the first channel 7 is sealed, and the air source interface 3 and the working port 5 are connected through the air flow channel 12.

[0031] This technical solution has the following advantages:

[0032] 1. In terms of conduction capacity, traditional valve cores all adopt a solid structure, and an air path is made between the solid valve core and the valve body, and the path is small. In this technical solution, the vertical part 9 of the piston is equivalent to the valve core, and an air flow channel 12 is set up from top to bottom. The valve core is set as a hollow structure, and the hollow part is the air path. The piston and the air path are integrated on the valve core. Compared with making an air path around the valve core, the hollow valve core has a larger path, a stronger conduction capacity, and a simple internal air path, and small resistance to gas.

[0033] 2. In terms of back pressure resistance, the vertical part 9 (valve core) in the present technical solution is subjected to gas pressure perpendicular to the direction of movement. Compared with the traditional valve core subjected to gas pressure along the direction of movement, the present design has smaller movement resistance and faster response, and reduces the spring force used for seal reset, so that the force that the spring 11 should bear is transferred to the tube wall of the vertical part 9 (valve core), so that the coil power, valve working pressure and flow rate can be achieved at the same time.

[0034] 3. In terms of starting pressure difference, the setting of the horizontal portion 10 of the technical solution makes the horizontal area of ​​the piston larger, and it can be started under a lower pressure difference.

[0035] 4. In terms of volume, this technical solution integrates the piston, valve core, piston chamber 6 and air path, efficiently utilizes space, reduces the volume of the valve body, reduces material costs, and has a simple structure and is easy to process.

[0036] Embodiment 2:

[0037] This embodiment is optimized based on the above-mentioned embodiment 1.

[0038] In order to provide a pilot structure, which is convenient for driving the piston downward without increasing the power of the electromagnet, the upper valve body 1 is connected to the pilot solenoid 22 through the pilot solenoid mounting position 21, and the upper valve body 1 is provided with a first pilot channel 23 and a second pilot channel 24, and the two ends of the first pilot channel 23 are respectively connected to the air source interface 3 and the pilot solenoid mounting position 21, and the two ends of the second pilot channel 24 are respectively connected to the pilot solenoid mounting position 21 and the piston chamber 6.

[0039] Embodiment 3:

[0040] This embodiment is optimized based on the above-mentioned embodiment 1.

[0041] An air inlet sealing structure is provided between the upper end of the piston and the upper valve body 1, and an air outlet sealing structure is provided between the lower end of the piston and the lower valve body 2. When the high-pressure gas source interface 3 is connected to the working port 5, it can be self-sealed to enhance the sealing performance and prevent leakage.

[0042] Embodiment 4:

[0043] This embodiment is optimized based on the above-mentioned embodiment 3.

[0044] In order to facilitate the arrangement of the air inlet sealing structure and the air outlet sealing structure, an air inlet sealing ring 13 is provided on the upper valve body 1 just above the vertical portion 9 , and an air outlet sealing ring 14 is provided on the lower valve body 2 just below the horizontal portion 10 .

[0045] Embodiment 5:

[0046] This embodiment is optimized based on the above-mentioned embodiment 4.

[0047] In order to increase the reliability of the end face sealing at the upper and lower ends of the piston, the upper and lower ends of the piston are respectively provided with an upper sealing end 15 and a lower sealing end 16 with a triangular cross-section. When the upper end of the piston is in a sealed state, the upper sealing end 15 abuts against the air inlet sealing ring 13, and when the lower end of the piston is in a sealed state, the lower sealing end 16 abuts against the air outlet sealing ring 14.

[0048] Embodiment 6:

[0049] This embodiment is optimized based on the above-mentioned embodiment 1.

[0050] In order to better achieve conduction between the air source interface 3 and the air flow channel 12 , an air inlet cavity 17 is provided on the upper valve body 1 . The air inlet cavity 17 is communicated with the air source interface 3 , and the upper end of the vertical portion 9 is located in the air inlet cavity 17 .

[0051] Embodiment 7:

[0052] This embodiment is optimized based on the above-mentioned embodiment 1.

[0053] In order to facilitate the installation of the spring 11 , a spring groove 18 is provided on the lower valve body 2 , and the spring 11 is arranged in the spring groove 18 . The spring groove 18 is coaxially arranged with the piston chamber 6 .

[0054] Embodiment 8:

[0055] This embodiment is optimized based on the above-mentioned embodiment 1.

[0056] In order to facilitate the forming of the piston cavity 6 , a piston groove is formed on one side of the upper valve body 1 close to the lower valve body 2 , and a piston cavity 6 is formed between the piston groove and the lower valve body 2 .

[0057] Embodiment 9:

[0058] This embodiment is optimized based on the above-mentioned embodiment 1.

[0059] In order to facilitate the setting of the interface, the air source interface 3 and the vent 4 are located on the same side of the valve body.

[0060] Embodiment 10:

[0061] This embodiment is optimized based on the above-mentioned embodiment 1.

[0062] In order to improve the sealing effect, a valve stem sealing ring 19 is provided between the vertical portion 9 and the upper valve body 1 , and a piston sealing ring 20 is provided on the horizontal portion 10 .

[0063] It should be noted that in the present technical solution, the downward movement of the piston can be directly driven by the coil moving iron core, or a pilot structure can be set on the valve body to drive the piston downward through the pilot airflow, and the spring 11 can realize the reset of the piston after the driving force disappears.

[0064] The working principle of using coil moving iron core to control the piston to move downward is as follows:

[0065] The air source interface 3 is connected to the air cylinder, the working port 5 is connected to the air cylinder, and the vent 4 is connected to the atmosphere. The coil moving iron core drives the piston to move down along the piston cavity 6, the vertical part 9 moves down, and the spring 11 is compressed. The upper end of the air flow channel 12 is connected to the air source interface 3, and the lower end of the air flow channel 12 is connected to the working port 5. The air source interface 3 is connected to the working port 5 through the air flow channel 12, the first channel 7 is sealed by the air outlet sealing structure, and the working port 5 is disconnected from the vent 4. When the coil moving iron core loses power, the piston is pushed upward by the spring 11 force, the upper end of the air flow channel 12 is sealed by the air intake sealing structure, the air source interface 3 and the working port 5 are disconnected, and the vent 4 and the working port 5 are connected through the piston cavity 6.

[0066] The working principle of using a pilot structure to control the downward movement of the piston is as follows:

[0067] The air source interface 3 takes in air, the working port 5 is connected to the cylinder, and the vent 4 is connected to the atmosphere. When the coil is energized, the moving iron core of the pilot electromagnetic head 22 is lifted, the air source interface 3 is connected to the piston chamber 6 through the first pilot channel 23 and the second pilot channel 24, and the gas enters the piston chamber 6, pushing the piston downward, driving the air inlet sealing structure between the vertical part 9 (valve core) and the upper valve body 1 to open, the air outlet sealing structure between the lower end surface of the piston and the lower valve body 2 to seal, the working port 5 is disconnected from the vent 4, and the air source interface 3 is connected to the working port 5. When the coil changes from energized to de-energized, the moving iron core of the pilot electromagnetic head 22 descends, the first pilot channel 23 and the second pilot channel 24 are disconnected, the air source interface 3 is disconnected from the piston chamber 6, and the piston is pushed upward by the force of the spring 11. The gas in the piston chamber 6 is discharged from the pilot electromagnetic head installation position 21 (pilot outlet) through the vent hole of the pilot electromagnetic head 22 to the atmosphere, and the vertical part 9 (valve core) is sealed with the air inlet sealing ring 13, disconnecting the air source interface 3 and the working port 5, and connecting the working port 5 and the vent 4.

[0068] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-position three-way solenoid valve, characterized in that: It comprises a valve body and a piston, the valve body comprises an upper valve body and a lower valve body, one side of the upper valve body is provided with an air source interface, the two sides of the lower valve body are respectively provided with a vent and a working port, a piston cavity is provided between the upper valve body and the lower valve body, the vent is communicated with the piston cavity through a first channel, and the working port is communicated with the piston cavity through a second channel; The piston includes an integrally formed vertical portion and a horizontal portion, the vertical portion vertically slidingly cooperates with the upper valve body, the horizontal portion is located in the piston cavity, a spring is provided between the horizontal portion and the lower valve body, an air flow channel is provided through the piston from top to bottom, when the piston is in an upward state, the upper end of the air flow channel is sealed, the air vent and the working port are connected through the piston cavity, when the piston is in a downward state, the first channel is sealed, and the air source interface is connected with the working port through the air flow channel.

2. A two-position three-way solenoid valve according to claim 1, characterized in that: The upper valve body is connected to the pilot solenoid through the pilot solenoid mounting position. The upper valve body is provided with a first pilot channel and a second pilot channel. The two ends of the first pilot channel are respectively connected to the air source interface and the pilot solenoid mounting position, and the two ends of the second pilot channel are respectively connected to the pilot solenoid mounting position and the piston chamber.

3. A two-position three-way solenoid valve according to claim 1, characterized in that: An air inlet sealing structure is provided between the upper end of the piston and the upper valve body, and an air outlet sealing structure is provided between the lower end of the piston and the lower valve body.

4. A two-position three-way solenoid valve according to claim 3, characterized in that: An air inlet sealing ring is provided on the upper valve body at a position just above the vertical portion, and an air outlet sealing ring is provided on the lower valve body at a position just below the horizontal portion.

5. A two-position three-way solenoid valve according to claim 4, characterized in that: The upper and lower ends of the piston are respectively provided with an upper sealing end and a lower sealing end with a triangular cross-section. When the upper end of the piston is in a sealed state, the upper sealing end abuts against an air inlet sealing ring, and when the lower end of the piston is in a sealed state, the lower sealing end abuts against an air outlet sealing ring.

6. A two-position three-way solenoid valve according to claim 1, characterized in that: An air inlet cavity is provided on the upper valve body, the air inlet cavity is communicated with the air source interface, and the upper end of the vertical portion is located in the air inlet cavity.

7. The two-position three-way solenoid valve according to claim 1, characterized in that: The lower valve body is provided with a spring groove, the spring is arranged in the spring groove, and the spring groove is coaxially arranged with the piston cavity.

8. The two-position three-way solenoid valve according to claim 1, characterized in that: A piston groove is formed on one side of the upper valve body close to the lower valve body, and a piston cavity is formed between the piston groove and the lower valve body.

9. The two-position three-way solenoid valve according to claim 1, characterized in that: The air source interface and the air vent are located on the same side of the valve body.

10. The two-position three-way solenoid valve according to claim 1, characterized in that: A valve stem sealing ring is arranged between the vertical portion and the upper valve body, and a piston sealing ring is arranged on the horizontal portion.

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