Two-position two-way electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, and discloses a two-position two-way electromagnetic valve which comprises a valve body and a valve element, one end of the valve body is provided with an inlet and an air inlet cavity which are communicated with each other, the other end of the valve body is provided with an outlet and an air outlet cavity which are communicated with each other, the valve element is in sliding fit with the valve body, and an airflow channel is formed in the valve element in a penetrating mode. The two ends of the airflow channel are communicated with the air inlet cavity and the air outlet cavity respectively, a large piston part and a small piston part are integrally formed at the end, close to the air inlet cavity, of the valve element, the outer diameter of the large piston part is larger than that of the small piston part, a piston cavity is formed in the valve body, and the large piston part is in sliding fit with the piston cavity. The small piston part is in sliding fit with the valve body, and an air inlet base table is arranged on one side of the air inlet cavity. According to the two-position two-way electromagnetic valve, the problem that the coil power, the working pressure and the flow of an existing two-position two-way valve cannot be obtained at the same time is solved.

Description

Technical Field

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

[0002] The existing two-position two-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. In large pressure differential conditions, 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 sacrificed to limit the flow capacity, which results 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 two-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] 8. The operative position of claim 7, wherein the operative position of the spool is one of the first and second operative positions, and the operative position of the spool is one of the first and second operative positions.

[0006] This technical solution has the following advantages:

[0007] 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, an air flow channel is provided through the valve core, and the valve core is set as a hollow structure. The hollow part is the air path, and 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 of this technical solution has a larger path and a stronger conduction capacity, and the internal air path is simple, with small resistance to the gas, small medium resistance to the valve core movement, and faster response.

[0008] 2. In terms of back pressure resistance, the 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 valve core tube wall, so that the coil power, valve working pressure and flow rate can be achieved at the same time.

[0009] 3. In terms of sealing, in this technical solution, a large piston part and a small piston part are integrally formed on the end of the valve core close to the air inlet cavity, and the small piston part is used for self-sealing, and the starting force is obtained by using the area difference between the large piston part and the small piston part when they are subjected to the same pressure. The large piston part and the small piston double piston structure are adopted, which takes into account both self-sealing and long stroke.

[0010] 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.

[0011] 5. A spring ring groove is opened on the small piston part of the valve core to fully utilize the space and reduce the weight of the valve core.

[0012] Furthermore, in order to facilitate the molding of the internal structure of the valve body, the valve body includes a left valve body, a middle valve body and a right valve body connected in sequence, the inlet and the air inlet base are arranged on the left valve body, the outer periphery of the air inlet base is provided with a plurality of air inlet vents, and the inlet is connected to the air inlet cavity through the air inlet vents; the outlet and the air outlet base are arranged on the right valve body, the outer periphery of the air outlet base is provided with a plurality of air outlet vents, and the outlet is connected to the air outlet cavity through the air outlet vents. The air inlet vents and air outlet vents arranged circumferentially are used to ventilate from all around the valve core without hindering the sealing of the valve core, thus saving space and reducing volume.

[0013] Furthermore, in order to facilitate the forming of the piston cavity and the air outlet cavity, a piston groove is formed on the side of the middle valve body close to the left valve body, a piston cavity is formed between the piston groove and the left valve body, the air inlet cavity is formed on the left valve body, the small piston part slides with the left valve body and extends into the air inlet cavity, and an air outlet groove is formed on the side of the middle valve body close to the right valve body, an air outlet cavity is formed between the air outlet groove and the right valve body.

[0014] Furthermore, in order to provide a pilot structure that facilitates the driving of the valve core without increasing the power of the electromagnet, the valve body is connected to the pilot solenoid through a pilot solenoid mounting position, and a pilot air intake path and a pilot air discharge path are provided on the valve body. The two ends of the pilot air intake path are respectively connected to the air intake chamber and the pilot solenoid mounting position, and the two ends of the pilot air discharge path are respectively connected to the pilot solenoid mounting position and the piston chamber.

[0015] The valve core is affected by the gas pressure difference, which changes from moving along the direction to being perpendicular to the direction of movement, so that the force that the spring should bear is transferred to the valve core tube wall, the spring compression force is reduced, and the pressure required for sealing and action comes from the medium. The combination of the pilot structure and the piston can open a larger stroke. Different from other pilot structures that rely on medium pressure to seal and rely on pressure difference to open the seal, resulting in a small equivalent diameter, the valve core of this design has a freer stroke and stronger flow capacity, so that the coil power, valve working pressure and flow are achieved at the same time.

[0016] Furthermore, in order to perform air intake sealing on the inlet end as required, an air intake sealing structure is provided between the small piston portion and the air intake base.

[0017] Furthermore, in order to improve the sealing effect, an inlet sealing ring is provided on the side of the air inlet base facing the small piston part, and an outlet sealing ring is provided on the side of the air outlet base facing the valve core.

[0018] Furthermore, the left valve body is provided with a self-sealing piston seal ring, the large piston part is provided with a piston seal ring, and the middle valve body is provided with a valve core seal ring. It has the functions of self-sealing, automatic compensation of the seal ring and double flow channels.

[0019] Furthermore, in order to facilitate the arrangement of the spring, the spring is arranged in a spring ring groove, and the other end of the spring abuts against the air intake base.

[0020] Furthermore, in order to achieve pressure relief in the piston chamber, a pressure relief air path is provided between the piston chamber and the air outlet chamber.

[0021] Furthermore, a pressure balance hole is provided on the large piston part, the piston cavity on the right side of the large piston part is the piston high pressure cavity, the piston cavity on the left side of the large piston part is the piston low pressure cavity, and the pressure balance hole connects the piston high pressure cavity and the piston low pressure cavity. Providing a pressure balance hole on the large piston part solves the pressure balance problem of piston reset and also serves as a secondary gas path to increase the flow rate.

[0022] The beneficial effects of the present invention are:

[0023] 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, an air flow channel is provided through the valve core, and the valve core is set as a hollow structure. The hollow part is the air path, and 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 of this technical solution has a larger path and a stronger conduction capacity, and the internal air path is simple, with small resistance to the gas, small medium resistance to the valve core movement, and faster response.

[0024] 2. In terms of back pressure resistance, the 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 valve core tube wall, so that the coil power, valve working pressure and flow rate can be achieved at the same time.

[0025] 3. In terms of sealing, in this technical solution, a large piston part and a small piston part are integrally formed on the end of the valve core close to the air inlet cavity, and the small piston part is used for self-sealing, and the starting force is obtained by using the area difference between the large piston part and the small piston part when they are subjected to the same pressure. The large piston part and the small piston double piston structure are adopted, which takes into account both self-sealing and long stroke.

[0026] 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.

[0027] 5. A spring ring groove is opened on the small piston part of the valve core to fully utilize the space and reduce the weight of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0030] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0031] Figure 4 It is a perspective structural schematic diagram of the present invention;

[0032] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the middle BB;

[0033] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of the CC;

[0034] Figure 7 It is a right view structural schematic diagram of the present invention;

[0035] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of DD;

[0036] Fig. 9 It is a schematic structural diagram of the valve core and piston part integrally formed in the present invention from a first perspective;

[0037] Fig.10This is a schematic structural diagram from a second perspective of the integrally formed valve core and piston portion of the present invention.

[0038] In the figure: valve core 1; inlet 2; air inlet chamber 3; outlet 4; air outlet chamber 5; air flow channel 6; large piston part 7; small piston part 8; piston chamber 9; piston high-pressure chamber 9.1; piston low-pressure chamber 9.2; air inlet base 10; spring ring groove 11; spring 12; air outlet base 13; left valve body 14; middle valve body 15; right valve body 16; air inlet vent 17; air outlet vent 18; pilot solenoid head installation position 19; pilot air inlet air path 20; pilot air outlet air path 21; inlet sealing ring 22; outlet sealing ring 23; self-sealing piston sealing ring 24; piston sealing ring 25; valve core sealing ring 26; pressure relief air path 27; pressure balance hole 28. DETAILED DESCRIPTION

[0039] 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.

[0040] Embodiment 1:

[0041] like Figure 1-Figure 10 As shown, the present embodiment provides a two-position two-way solenoid valve, comprising a valve body and a valve core 1, wherein one end of the valve body is provided with an inlet 2 and an air inlet cavity 3 which are interconnected, and the other end of the valve body is provided with an outlet 4 and an air outlet cavity 5 which are interconnected, the valve core 1 is slidably matched with the valve body, an air flow channel 6 is provided through the valve core 1, and the two ends of the air flow channel 6 are respectively connected with the air inlet cavity 3 and the air outlet cavity 5, a large piston portion 7 and a small piston portion 8 are integrally formed at one end of the valve core 1 close to the air inlet cavity 3, the outer diameter of the large piston portion 7 is larger than the outer diameter of the small piston portion 8, a piston cavity 9 is provided on the valve body, the large piston portion 7 is slidably matched with the piston cavity 9, and the small piston portion 8 is slidably matched with the valve body, an air inlet base 10 is provided on one side of the air inlet cavity 3, a spring ring groove 11 is provided on the end of the small piston portion 8 which faces the air inlet base 10, a spring 12 is provided between the spring ring groove 11 and the air inlet base 10, an air outlet base 13 is provided on one side of the air outlet cavity 5, and an air outlet sealing structure is provided between the end of the valve core 1 and the air outlet base 13.

[0042] This technical solution has the following advantages:

[0043] 1. In terms of conduction capacity, the traditional valve core 1 adopts a solid structure, and an air path is made between the solid valve core 1 and the valve body, and the path is small. In the present technical solution, an air flow channel 6 is provided through the valve core 1, and the valve core 1 is set as a hollow structure. The hollow part is the air path, and the piston and the air path are integrated on the valve core 1. Compared with making an air path around the valve core 1, the hollow valve core 1 of the present technical solution has a larger path and a stronger conduction capacity, and the internal air path is simple, with small resistance to the gas, the valve core 1 movement is subject to small medium resistance, and the response is faster.

[0044] 2. In terms of back pressure resistance, the valve core 1 in the present technical solution is subjected to gas pressure perpendicular to the direction of movement. Compared with the traditional valve core 1 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 12 should bear is transferred to the tube wall of the valve core 1, so that the coil power, valve working pressure and flow rate are achieved at the same time.

[0045] 3. In terms of sealing, in this technical solution, a large piston part 7 and a small piston part 8 are integrally formed on one end of the valve core 1 close to the air inlet chamber 3, and the small piston part 8 is used for self-sealing, and the starting force is obtained by using the area difference between the large piston part 7 and the small piston part 8 when they are subjected to the same pressure. The large piston part 7 and the small piston double piston structure are adopted, which takes into account both self-sealing and long stroke.

[0046] 4. In terms of volume, this technical solution integrates the piston, valve core 1, piston chamber 9 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.

[0047] 5. A spring ring groove 11 is provided on the small piston portion 8 of the valve core 1, which fully utilizes the space and reduces the weight of the valve core 1.

[0048] Embodiment 2:

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

[0050] In order to facilitate the molding of the internal structure of the valve body, the valve body includes a left valve body 14, a middle valve body 15 and a right valve body 16 connected in sequence. The inlet 2 and the air inlet base 10 are arranged on the left valve body 14. The outer periphery of the air inlet base 10 is provided with a plurality of air inlet vents 17. The inlet 2 is connected to the air inlet cavity 3 through the air inlet vents 17. The outlet 4 and the air outlet base 13 are arranged on the right valve body 16. The outer periphery of the air outlet base 13 is provided with a plurality of air outlet vents 18. The outlet 4 is connected to the air outlet cavity 5 through the air outlet vents 18. The air inlet vents 17 and the air outlet vents 18 arranged circumferentially are used to ventilate from all around the valve core 1 without hindering the sealing of the valve core 1, thus saving space and reducing the volume.

[0051] Embodiment 3:

[0052] This embodiment is optimized based on the above-mentioned embodiment 2.

[0053] In order to facilitate the forming of the piston chamber 9 and the air outlet chamber 5, a piston groove is formed on the side of the middle valve body 15 close to the left valve body 14, and a piston chamber 9 is formed between the piston groove and the left valve body 14. The air inlet chamber 3 is formed on the left valve body 14, and the small piston part 8 slides with the left valve body 14 and extends into the air inlet chamber 3. An air outlet groove is formed on the side of the middle valve body 15 close to the right valve body 16, and an air outlet chamber 5 is formed between the air outlet groove and the right valve body 16.

[0054] Embodiment 4:

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

[0056] In order to provide a pilot structure, which is convenient for driving the valve core 1 without increasing the power of the electromagnet, the valve body is connected to the pilot solenoid (not shown in the figure) through the pilot solenoid mounting position 19, and a pilot air intake path 20 and a pilot air outlet path 21 are provided on the valve body. The two ends of the pilot air intake path 20 are respectively connected to the air intake chamber 3 and the pilot solenoid mounting position 19, and the two ends of the pilot air outlet path 21 are respectively connected to the pilot solenoid mounting position 19 and the piston chamber 9.

[0057] The valve core 1 is affected by the gas pressure difference, which changes from moving along the direction to being perpendicular to the direction of movement, so that the force that the spring 12 should bear is transferred to the wall of the valve core 1, and the compression force of the spring 12 is reduced. The pressure required for sealing and action comes from the medium. The combination of the pilot structure and the piston can open a larger stroke. Different from other pilot structures that rely on medium pressure to seal and rely on pressure difference to open the seal, resulting in a small equivalent diameter, the valve core 1 of this design has a freer stroke and stronger flow capacity, so that the coil power, valve working pressure and flow are achieved at the same time.

[0058] It should be noted that, in the present technical solution, the pilot structure part can be cancelled, and the coil moving iron core can be used to directly drive the valve core 1 instead.

[0059] Embodiment 5:

[0060] This embodiment is optimized based on the above-mentioned embodiment 1.

[0061] In order to perform air intake sealing on the inlet 2 end as required, an air intake sealing structure is provided between the small piston portion 8 and the air intake base 10 .

[0062] Embodiment 6:

[0063] This embodiment is optimized based on the above-mentioned embodiment 5.

[0064] In order to improve the sealing effect, an inlet sealing ring 22 is provided on the side of the air inlet base 10 facing the small piston part 8 , and an outlet sealing ring 23 is provided on the side of the air outlet base 13 facing the valve core 1 .

[0065] Embodiment 7:

[0066] This embodiment is optimized based on the above-mentioned embodiment 2.

[0067] A self-sealing piston seal ring 24 is provided on the left valve body 14, a piston seal ring 25 is provided on the large piston part 7, and a valve core seal ring 26 is provided on the middle valve body 15. It has the functions of self-sealing, automatic compensation of the seal ring and double flow channels.

[0068] Embodiment 8:

[0069] This embodiment is optimized based on the above-mentioned embodiment 1.

[0070] In order to facilitate the arrangement of the spring 12 , the spring 12 is arranged in the spring ring groove 11 , and the other end of the spring 12 abuts against the air intake base 10 .

[0071] Embodiment 9:

[0072] This embodiment is optimized based on the above-mentioned embodiment 1.

[0073] In order to achieve pressure relief of the piston chamber 9 , a pressure relief air path 27 is provided between the piston chamber 9 and the air outlet chamber 5 .

[0074] Embodiment 10:

[0075] This embodiment is optimized based on the above-mentioned embodiment 1.

[0076] A pressure balance hole 28 is provided on the large piston part 7. The piston cavity 9 on the right side of the large piston part 7 is a piston high pressure cavity 9.1, and the piston cavity 9 on the left side of the large piston part 7 is a piston low pressure cavity 9.2. The pressure balance hole 28 connects the piston high pressure cavity 9.1 and the piston low pressure cavity 9.2. The pressure balance hole 28 is provided on the large piston part 7 to solve the pressure balance problem of piston reset and also increase the flow rate as a secondary gas path.

[0077] Working principle:

[0078] This patent adopts a systematic design that fully utilizes the space and does not affect the normal operation of each part, integrating the pilot structure, piston, valve core 1 and air path. When the coil of the pilot solenoid loses power, the pilot exhaust air path 21 is blocked and closed by the moving iron core of the pilot solenoid, and the valve core 1 seals the outlet 4 under the action of the spring force and the pressure difference of the self-sealing piston; when the coil of the pilot solenoid is energized, the moving iron core of the pilot solenoid is lifted, the pilot exhaust air path 21 is opened, and the medium reaches the piston high-pressure chamber 9.1 through the inlet 2, the pilot air intake air path 20, and the pilot exhaust air path 21 in turn. Since the area of ​​the large piston part 7 is larger than that of the small piston part 8 (self-sealing piston), the medium pressures of the two are almost the same, so the combined force is to the left, the piston moves to the left, the outlet 4 opens, the inlet 2 is connected to the inlet chamber 3 through the inlet vent hole 17, the inlet chamber 3 is connected to the outlet chamber 5 through the air flow channel 6, and the outlet chamber 5 is connected to the outlet 4 through the outlet vent hole 18, so that the inlet 2 and the outlet 4 are connected through the air flow channel 6 of the valve core 1. At the same time, the pressure balance hole 28 connects the piston high-pressure chamber 9.1 with the piston low-pressure chamber 9.2. Since the aperture of the pressure balance hole 28 is small, the piston will still be pushed. In addition, the pressure balance hole 28, as a secondary air path, also increases the flow of the valve to a certain extent. When the coil of the pilot solenoid changes from energized to de-energized, the pilot exhaust gas path 21 is blocked, disconnecting the connection between the piston high-pressure chamber 9.1 and the inlet 2. The medium in the piston chamber 9 balances the pressure through the pressure balance hole 28. The spring force on the valve core 1 and the medium pressure on the small piston part 8 (self-sealing piston) are greater than the leftward thrust of the piston, driving the valve core 1 to move to the right and seal the outlet 4.

[0079] 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, two-way solenoid valve, characterized in that: The closure of the valve body is connected with the closure of the valve body through the closure of the valve body and the closure of the valve body through the closure of the valve body.

2. A two-position, two-way solenoid valve according to claim 1, characterized in that: The valve body includes a left valve body, a middle valve body and a right valve body connected in sequence, the inlet and the air inlet base are arranged on the left valve body, the outer periphery of the air inlet base is provided with a plurality of air inlet vent holes, and the inlet is connected with the air inlet cavity through the air inlet vent holes; the outlet and the air outlet base are arranged on the right valve body, the outer periphery of the air outlet base is provided with a plurality of air outlet vent holes, and the outlet is connected with the air outlet cavity through the air outlet vent holes.

3. A two-position two-way solenoid valve according to claim 2, characterized in that: A piston groove is formed on the side of the middle valve body close to the left valve body, a piston cavity is formed between the piston groove and the left valve body, the air inlet cavity is formed on the left valve body, the small piston part slides with the left valve body and extends into the air inlet cavity, an air outlet groove is formed on the side of the middle valve body close to the right valve body, an air outlet cavity is formed between the air outlet groove and the right valve body.

4. A two-position two-way solenoid valve according to claim 1, characterized in that: The valve body is connected to the pilot solenoid via a pilot solenoid mounting position, and a pilot air intake path and a pilot exhaust path are provided on the valve body. The two ends of the pilot air intake path are respectively connected to the air intake cavity and the pilot solenoid mounting position, and the two ends of the pilot exhaust path are respectively connected to the pilot solenoid mounting position and the piston cavity.

5. The two-position two-way solenoid valve according to claim 1, characterized in that: An air intake sealing structure is provided between the small piston part and the air intake base.

6. A two-position, two-way solenoid valve according to claim 5, characterized in that: An inlet sealing ring is arranged on the side of the air inlet base facing the small piston part, and an outlet sealing ring is arranged on the side of the air outlet base facing the valve core.

7. A two-position, two-way solenoid valve according to claim 2, characterized in that: A self-sealing piston sealing ring is arranged on the left valve body, a piston sealing ring is arranged on the large piston part, and a valve core sealing ring is arranged on the middle valve body.

8. The two-position two-way solenoid valve according to claim 1, characterized in that: The spring is arranged in the spring ring groove, and the other end of the spring abuts against the air intake base.

9. The two-position two-way solenoid valve according to claim 1, characterized in that: A pressure relief air path is provided between the piston cavity and the air outlet cavity.

10. The two-position two-way solenoid valve according to claim 1, characterized in that: The large piston part is provided with a pressure balance hole, the piston cavity on the right side of the large piston part is the piston high-pressure cavity, the piston cavity on the left side of the large piston part is the piston low-pressure cavity, and the pressure balance hole connects the piston high-pressure cavity and the piston low-pressure cavity.

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