Dual solenoid proportional control valve

Abstract

The application discloses a double-electromagnet proportional control valve, which comprises a base and a valve body shell connected with each other, and an air inlet channel, an air outlet channel and an exhaust channel are formed in the base and the valve body shell; an air inlet valve core assembly and an exhaust valve core assembly are respectively arranged at two ends of an inner cavity of the valve body shell, and the valve body inner cavity between the air inlet valve core assembly and the exhaust valve core assembly is communicated with the air outlet channel; the air inlet valve core assembly is communicated with the air inlet channel, and the rear end of the air inlet valve core assembly is connected with an air inlet electromagnet; the exhaust valve core assembly is communicated with the exhaust channel, and the rear end of the exhaust valve core assembly is connected with an exhaust electromagnet; a control circuit board is connected with the air inlet electromagnet and the exhaust electromagnet; the control circuit board is further connected with a pressure sensor, and the pressure sensor is communicated with the air outlet channel. The air inlet and the exhaust of the valve body are respectively controlled by using two valve core assemblies, the action response time is greatly shortened, and the sensitivity of the whole valve is improved.

Description

Technical Field

[0001] This invention relates to the field of proportional valve technology, specifically to a dual electromagnet proportional control valve. Background Technology

[0002] A proportional valve is a new type of pneumatic pressure control device that uses a proportional electromagnet to replace the control part of a traditional valve. It can remotely control the pressure and flow of gas using electrical signals, has pressure compensation characteristics, and load changes will not affect the gas flow rate. It has a wide range of applications.

[0003] Currently, the most common proportional valve in existing technology consists of a main valve body and a pilot valve. The valve core inside the pilot valve is made with a certain taper, and then the current air volume is controlled by an integrated displacement monitoring device and drive device to indirectly control the air volume of the main valve. Under closed-loop control, the pilot valve needs to repeatedly collect the outlet pressure and adjust the pilot valve. Because it is an indirect control, it has a certain lag, and the time consumed by repeated adjustments is relatively long. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a dual electromagnet proportional control valve. By using two sets of valve core assemblies to control the air intake and exhaust of the valve body respectively, the action response time is greatly shortened, and the sensitivity of the entire valve is improved.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A dual-electromagnetic proportional control valve includes a base and a valve body housing connected to each other. An air inlet channel, an air outlet channel, and an exhaust channel are provided on the base and valve body housing. An air inlet valve core assembly and an exhaust valve core assembly are respectively provided at both ends of the inner cavity of the valve body housing. The inner cavity of the valve body housing between the air inlet valve core assembly and the exhaust valve core assembly is connected to the air outlet channel. The air inlet valve core assembly is connected to the air inlet channel, and its rear end is connected to an air inlet electromagnet. The exhaust valve core assembly is connected to the exhaust channel, and its rear end is connected to an exhaust electromagnet. A control circuit board is connected to both the air inlet electromagnet and the exhaust electromagnet. The control circuit board is also connected to a pressure sensor, which is connected to the air outlet channel.

[0007] Furthermore, a circuit board housing is connected to the top of the valve body housing, and the control circuit board is located inside the circuit board housing; a transition sleeve is connected between the valve body housing and the circuit board housing, the transition sleeve is hollow inside, one end of the pressure sensor is connected to the control circuit board, and the other end extends into the transition sleeve.

[0008] Furthermore, a circuit board cover is connected to the top of the circuit board housing. The control circuit board is encapsulated within the space formed by the circuit board housing and the circuit board cover. A connector is installed on the circuit board cover, and the connector is connected to the control circuit board.

[0009] Furthermore, the external setpoint signal is transmitted to the control circuit board through the connector. The pressure sensor transmits the detected outlet pressure value to the control circuit board. When the detected pressure is less than the set value, the control circuit board supplies power to the intake solenoid, which pushes the intake valve core assembly to move. When the detected pressure is greater than the set value, the control circuit board supplies power to the exhaust solenoid, which pushes the exhaust valve core assembly to move.

[0010] Furthermore, the intake valve core assembly structure is the same as the exhaust valve core assembly structure. The exhaust valve core assembly includes a stationary iron core A and a moving iron core A slidably disposed inside the stationary iron core A. An exhaust port communicating with the exhaust channel is opened on the stationary iron core A. A spring A is installed in the cavity between the stationary iron core A and the moving iron core A. A nut A is installed at the front end of the moving iron core A. A special-shaped sealing ring A is bonded to the inside of the nut A. The special-shaped sealing ring A contacts and seals with the front end of the stationary iron core A or separates and opens.

[0011] Furthermore, a positioning screw A coated with thread-locking adhesive is inserted into the rear end of the moving iron core A, and the extension rod of the exhaust electromagnet is connected to the positioning screw A.

[0012] Furthermore, a vent plug is connected to the bottom of the circuit board casing.

[0013] The beneficial effects of this invention include: by using two sets of valve core assemblies to control the air intake and exhaust of the valve body respectively, the response time is greatly shortened, improving the overall valve sensitivity. The coordinated action of the two sets of electromagnets enables regulation of the outlet pressure. Furthermore, since the air intake and exhaust are independently controlled by the circuit board, the flow rate of this valve is greater than that of valves of the same size. This product has advantages such as high precision, fast response, large flow rate, long service life, and compact structure. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the overall structure of a dual electromagnet proportional control valve according to the present invention;

[0015] Figure 2 This is a cross-sectional view of the exhaust valve core assembly structure;

[0016] Figure 3 This is a cross-sectional view of the intake valve core assembly structure;

[0017] Figure 4 This is an air intake flow diagram of a dual electromagnet proportional control valve according to the present invention. The arrows in the diagram indicate the air intake flow path of the proportional control valve.

[0018] Figure 5 This is a diagram of the exhaust flow of a dual electromagnet proportional control valve according to the present invention. The arrows in the diagram indicate the exhaust flow path of the proportional control valve.

[0019] Figure 6This is a comparison diagram of the valve core assembly's static iron core sealing arc surface in both sealed and open states;

[0020] Figure 7 This is an isometric view of the external structure of a dual electromagnet proportional control valve according to the present invention.

[0021] Explanation of the reference numerals in the diagram: a—Intake channel; b—Outtake channel; c—Exhaust channel; d—Valve body cavity; e—Sealing arc surface of stationary iron core B; f—Sealing arc surface of stationary iron core A;

[0022] 1—Base; 2—Rubber sealing gasket; 3—O-ring C; 4—Exhaust solenoid; 5—Sealing ring A; 6—Connector; 7—Exhaust valve core assembly; 8—O-ring A; 9—Transition sleeve; 10—Retaining ring; 11—Pressure sensor; 12—Gasket; 13—O-ring B; 14—Plug; 15—Intake valve core assembly; 16—Sealing ring B; 17—Valve body housing; 18—Circuit board cover; 19—Control circuit board; 20—Circuit board housing; 21—Ventilator plug; 22—Intake solenoid; 23—O-ring D;

[0023] 7.1—O-ring; 7.2—Locating screw A; 7.3—Moving iron core A; 7.4—Spring A; 7.5—Stationary iron core A; 7.6—Lip seal A; 7.7—O-ring G; 7.8—O-ring E; 7.9—Irregular shaped sealing ring A; 7.10—Nut A;

[0024] 15.1—O-ring I; 15.2—Locating screw B; 15.3—Moving iron core B; 15.4—Spring B; 15.5—Stationary iron core B; 15.6—Lip seal B; 15.7—O-ring J; 15.8—O-ring H; 15.9—Irregular shaped sealing ring B; 15.10—Nut B. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only to distinguish components and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] A dual-electromagnetic proportional control valve is disclosed. Valve control is achieved by an external signal transmitted to a control circuit board. A pressure sensor detects the outlet pressure and transmits this pressure value to the control circuit board. The control circuit board performs PID calculations and sends signals to the proportional electromagnets, controlling their opening and closing actions. When the detected pressure is lower than the set value, the control circuit board powers the inlet electromagnet, opening the inlet valve core to supply gas. When the detected pressure is higher than the set value, the control circuit board powers the exhaust electromagnet, opening the exhaust valve core to release gas. Through the coordinated action of these two sets of electromagnets, the outlet pressure is regulated. This product features high precision, fast response, large flow rate, long service life, and compact structure.

[0029] Example 1

[0030] like Figure 1 As shown, a dual electromagnet proportional control valve includes a base 1 and a valve body housing 17 connected to each other. An air inlet channel a, an air outlet channel b, and an exhaust channel c are provided on the base 1 and the valve body housing 17. A rubber sealing gasket 2 is provided between the base 1 and the valve body housing 17 to seal the air inlet channel a, the air outlet channel b, and the exhaust channel c.

[0031] Each end of the valve body housing 17 is equipped with a proportional electromagnet and a valve core assembly. These two assemblies are used to control the outlet pressure. Specifically, each end of the inner cavity of the valve body housing 17 is equipped with a valve core assembly, such as... Figure 1 As shown, the left end is the intake valve core assembly 15, and the right end is the exhaust valve core assembly 7. The valve body cavity d between the intake valve core assembly 15 and the exhaust valve core assembly 7 is connected to the exhaust passage b. An intake solenoid 22 located outside the valve body housing 17 is connected to the outside of the intake valve core assembly 15, and the intake valve core assembly 15 is connected to the intake passage a. An exhaust solenoid 4 located outside the valve body housing 17 is connected to the outside of the exhaust valve core assembly 7, and the exhaust valve core assembly 7 is connected to the exhaust passage c. An O-ring C3 is installed between the valve body housing 17 and the exhaust solenoid 4, and an O-ring D23 is installed between the valve body housing 17 and the intake solenoid 22. Both O-rings C3 and D23 serve a sealing function.

[0032] A circuit board housing 20 is connected to the top of the valve body housing 17, and a sealing ring B16 is installed between the valve body housing 17 and the circuit board housing 20. A control circuit board 19 is installed inside the circuit board housing 20, and the control circuit board 19 is connected to the intake solenoid 22 and the exhaust solenoid 4 respectively. The control circuit board 19 is also connected to a pressure sensor 11, which uses a transition structure to collect the pressure at the outlet port b. Specifically:

[0033] A transition sleeve 9 connects the valve body housing 17 and the circuit board housing 20. One end of the pressure sensor 11 is connected to the control circuit board 19, and the other end extends into the transition sleeve 9; more specifically, as Figure 1 As shown, the upper side wall of the valve body housing 17 has an inwardly recessed groove in the middle, and a vent hole communicating with the inner cavity d of the valve body is opened at the bottom of the groove. The lower end of the transition sleeve 9 is installed in the groove, and an O-ring A8 is provided between the outer wall of the lower end of the transition sleeve 9 and the groove of the valve body housing 17. The top end of the transition sleeve 9 is embedded in the circuit board housing 20.

[0034] The transition sleeve 9 has a vent cavity in its middle that communicates with the vent hole at the bottom of the aforementioned groove. The top of the transition sleeve 9 has an insertion groove that communicates with the vent cavity. From bottom to top, an O-ring B13, a gasket 12, and a retaining ring 10 are sequentially arranged on the inner wall of the insertion groove. The O-ring B13 and gasket 12 are fixed by the retaining ring 10. The pressure sensor 11 is inserted into the O-ring B13 in the insertion groove. This transition structure can compensate for insufficient assembly precision between the control circuit board 19 and the circuit board housing 20.

[0035] A circuit board cover plate 18 is connected to the top of the circuit board housing 20, which is used to encapsulate the control circuit board 19 within the space enclosed by the circuit board housing 20 and the circuit board cover plate 18. A sealing ring A5 is installed between the circuit board cover plate 18 and the circuit board housing 20. A plug 14 is tightened on the circuit board cover plate 18. Opening the plug 14 allows for operations such as program adjustment of the control circuit board 19. A connector 6 is installed on the circuit board cover plate 18, and the connector 6 is connected to the control circuit board 19. A vent plug 21 is connected to the bottom of the circuit board housing 20 to balance the pressure between the cavity where the control circuit board 19 is installed and the external environment.

[0036] After the external control signal is transmitted to the control circuit board 19 through connector 6, the control circuit board 19 outputs the voltage and current to control the exhaust solenoid 4 and the intake solenoid 22. The exhaust solenoid 4 and the intake solenoid 22 respectively drive the exhaust valve core assembly 7 and the intake valve core assembly 15 to operate. At the same time, the control circuit board 19 detects the outlet pressure signal through the pressure sensor 11 and performs closed-loop control, transmitting the calculated signal to the exhaust solenoid 4 and the intake solenoid 22. By controlling the exhaust solenoid 4 and the intake solenoid 22 to drive the exhaust valve core assembly 7 and the intake valve core assembly 15, the outlet pressure is adjusted.

[0037] like Figure 2As shown, the exhaust valve core assembly 7 includes a stationary iron core A7.5 and a moving iron core A7.3 slidably disposed inside the stationary iron core A7.5. The stationary iron core A7.5 has an exhaust port communicating with the exhaust channel c. A spring A7.4 is installed in the cavity between the stationary iron core A7.5 and the moving iron core A7.3. A lip seal A7.6 is installed in the guide surface between the stationary iron core A7.5 and the moving iron core A7.3. A nut A7.10 is installed at the front end of the moving iron core A7.3, and an O-ring E7.8 is installed between the nut A7.10 and the moving iron core A7.3, serving a sealing function. A shaped sealing ring A7.9 is also present. Through a rubber vulcanization process, it is firmly bonded to the groove of nut A7.10, ensuring no air leakage between the shaped sealing ring A7.9 and nut A7.10. The shaped sealing ring A7.9 must have wear-resistant, oil-resistant, and aging-resistant properties. The contact position between the shaped sealing ring A7.9 and the front end of the stationary iron core A7.5 is the sealing arc surface f of the stationary iron core A. The positioning screw A7.2 is tightened to the rear end of the moving iron core A7.3 with thread-locking adhesive applied. The extension rod of the exhaust solenoid 4 is connected to the positioning screw A7.2. The positioning screw A7.2 is used to compensate for the length of the solenoid extension rod. After the position is confirmed, tightening is stopped, and it is left to stand until the thread-locking adhesive cures. O-rings F7.1 and G7.7 are respectively provided between the stationary iron core A7.5 and the inner wall of the valve body shell 17 to seal the exhaust side air passage.

[0038] like Figure 3 As shown, the intake valve core assembly 15 has the same structure as the exhaust valve core assembly 7, including a stationary iron core B15.5 and a moving iron core B15.3 slidably disposed inside the stationary iron core B15.5. The stationary iron core B15.5 has an intake port communicating with the intake channel a. A spring B15.4 is installed in the cavity between the stationary iron core B15.5 and the moving iron core B15.3, and a lip seal B15.6 is installed in the guide surface between the stationary iron core B15.5 and the moving iron core B15.3. A nut B15.10 is installed at the front end of the moving iron core B15.3, and an O-ring H15.8 is installed between the nut B15.10 and the moving iron core B15.3, which serves as a seal. The shaped sealing ring B15.9 is firmly bonded to the groove of the nut B15.10 through a rubber vulcanization process, ensuring no air leakage between the shaped sealing ring B15.9 and the nut B15.10. The shaped sealing ring B15.9 must have wear-resistant, oil-resistant, and aging-resistant properties. The contact position between the shaped sealing ring B15.9 and the front end of the stationary iron core B15.5 is the sealing arc surface e of the stationary iron core B. The positioning screw B15.2 is tightened to the rear end of the moving iron core B15.3 with thread-locking adhesive applied. The extension rod of the intake solenoid 22 is connected to the positioning screw B15.2. The positioning screw B15.2 is used to compensate for the length of the solenoid extension rod. After the position is confirmed, tightening is stopped, and the screw is left to stand until the thread-locking adhesive cures. O-rings I15.1 and J15.7 are respectively provided between the stationary iron core B15.5 and the inner wall of the valve body shell 17 to seal the exhaust side air passage.

[0039] like Figure 4 As shown, this is the air intake flow diagram of a high-precision dual electromagnet proportional control valve. After the air intake electromagnet 22 is energized, the electromagnet extension rod is pushed out, which pushes the moving iron core B15.3 to move to the right. The irregular sealing ring B15.9 separates from the sealing arc surface e of the stationary iron core B15.5. At this time, the gas flows into the outlet channel b through the air intake channel a, completing the air intake action. Figure 4 The arrow shown indicates the direction of gas flow during intake.

[0040] like Figure 5 The diagram shows the exhaust flow of a high-precision dual-electromagnet proportional control valve. When the exhaust solenoid 4 is energized, the solenoid extends out, pushing the moving iron core A7.3 to the left. The irregular sealing ring A7.9 separates from the sealing arc surface f of the stationary iron core A7.5. At this time, the gas flows into the exhaust channel c through the valve body cavity d, completing the exhaust action. Figure 5 The arrow shown indicates the direction of gas flow during exhaust.

[0041] Principle: An external setpoint signal is transmitted to the control circuit board 19 via connector 6. The pressure sensor 11 transmits the detected outlet pressure value to the control circuit board 19, which then transmits the signal to the proportional electromagnet, controlling its opening and closing action. When the detected pressure is less than the setpoint, the control circuit board 19 supplies power to the intake electromagnet 22, which pushes the moving iron core B15.3 to move, overcoming the resistance of the spring B15.4 and opening to replenish gas. When the detected pressure is greater than the setpoint, the control circuit board 19 supplies power to the exhaust electromagnet 4, which pushes the moving iron core A7.3 to move, overcoming the resistance of the spring A7.4 and opening to release gas.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A dual-electromagnetic proportional control valve, characterized in that, The system includes a base (1) and a valve body housing (17) connected together. An air intake channel (a), an air outlet channel (b), and an exhaust channel (c) are provided on the base (1) and the valve body housing (17). An air intake valve core assembly (15) and an exhaust valve core assembly (7) are respectively provided at both ends of the inner cavity of the valve body housing (17). The inner cavity (d) of the valve body housing (15) and the exhaust valve core assembly (7) is connected to the air outlet channel (b). The air intake valve core assembly (15) is connected to the air intake channel (a), and the rear end of the air intake valve core assembly (15) is connected to the air intake electromagnet (22). The exhaust valve core assembly (7) is connected to the exhaust channel (c), and the rear end of the exhaust valve core assembly (7) is connected to the exhaust electromagnet (4). A control circuit board (19) is connected to the air intake electromagnet (22) and the exhaust electromagnet (4) respectively. The control circuit board (19) is also connected to a pressure sensor (11), and the pressure sensor (11) is connected to the air outlet channel (b). A circuit board housing (20) is connected to the top of the valve body housing (17), and the control circuit board (19) is located inside the circuit board housing (20). A transition sleeve (9) is connected between the valve body housing (17) and the circuit board housing (20). The transition sleeve (9) is hollow inside. One end of the pressure sensor (11) is connected to the control circuit board (19), and the other end extends into the transition sleeve (9). Specifically, the upper side wall of the valve body housing (17) has an inwardly recessed groove in the middle. A vent hole communicating with the inner cavity d of the valve body is opened at the bottom of the groove. The lower end of the transition sleeve (9) is installed in the groove. An O-ring A (8) is provided between the lower outer wall of the transition sleeve (9) and the groove of the valve body housing (17). The top of the transition sleeve (9) is embedded in the circuit board housing (20). The transition sleeve (9) has a ventilation cavity in the middle that communicates with the ventilation hole at the bottom of the groove. The transition sleeve (9) has an insertion groove at the top that communicates with the ventilation cavity. The inner wall of the insertion groove is provided with an O-ring B (13), a gasket (12) and a retaining ring (10) from bottom to top. The O-ring B (13) and the gasket (12) are fixed by the retaining ring (10). The pressure sensor (11) is inserted into the O-ring B (13) in the insertion groove.

2. The dual electromagnet proportional control valve according to claim 1, characterized in that, The top of the circuit board housing (20) is connected to the circuit board cover plate (18). The control circuit board (19) is encapsulated in the space enclosed by the circuit board housing (20) and the circuit board cover plate (18). A connector (6) is installed on the circuit board cover plate (18) and the connector (6) is connected to the control circuit board (19).

3. The dual electromagnet proportional control valve according to claim 2, characterized in that, The external setpoint signal is transmitted to the control circuit board (19) through the connector (6). The pressure sensor (11) transmits the detected outlet pressure value to the control circuit board (19). When the detected pressure is less than the set value, the control circuit board (19) supplies power to the intake electromagnet (22), and the intake electromagnet (22) pushes the intake valve core assembly (15) to move. When the detected pressure is greater than the set value, the control circuit board (19) supplies power to the exhaust electromagnet (4), and the exhaust electromagnet (4) pushes the exhaust valve core assembly (7) to move.

4. A dual-electromagnetic proportional control valve according to claim 3, characterized in that, The structure of the intake valve core assembly (15) is the same as that of the exhaust valve core assembly (7). The exhaust valve core assembly (7) includes a stationary iron core A (7.5) and a moving iron core A (7.3) that is slidably disposed inside the stationary iron core A (7.5). An exhaust port communicating with the exhaust passage (c) is provided on the stationary iron core A (7.5). A spring A (7.4) is installed in the cavity between the stationary iron core A (7.5) and the moving iron core A (7.3). A nut A (7.10) is installed at the front end of the moving iron core A (7.3). A special-shaped sealing ring A (7.9) is bonded to the inside of the nut A (7.10). The special-shaped sealing ring A (7.9) is in contact with the front end of the stationary iron core A (7.5) for sealing or is separated from it for opening.

5. A dual-electromagnetic proportional control valve according to claim 4, characterized in that, The rear end of the moving iron core A (7.3) is inserted with a positioning screw A (7.2) coated with thread adhesive, and the extension rod of the exhaust electromagnet (4) is connected to the positioning screw A (7.2).

6. A dual-electromagnetic proportional control valve according to claim 2, characterized in that, A vent plug (21) is connected to the bottom of the circuit board casing (20).

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