Solenoid valve control system, method and solenoid valve

Abstract

The present invention discloses a solenoid valve control system, method and solenoid valve, and relates to the technical field of solenoid valve control. The solenoid valve control system includes a first switch, a second switch, a sampling resistor and a control circuit connected in series with an electromagnetic coil and a power supply of the solenoid valve. The control circuit is connected to the first switch, the second switch and the sampling resistor and is configured to: when the valve core of the solenoid valve is opened, control the first switch and the second switch to be closed to obtain the current flowing through the sampling resistor; when the current reaches a first preset value, control the second switch to be opened; and then control the second switch to be opened or closed according to the current, so that the current maintains the valve core open within a preset range; and control the first switch and the second switch to be closed or opened by the control circuit according to the current size of the electromagnetic coil, thereby reducing the conduction current of the electromagnetic coil, avoiding heating of the electromagnetic coil and vaporization of low-temperature propellant, and improving the stability of the operation of the solenoid valve.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valve control, and in particular to a solenoid valve control system, method and solenoid valve. Background Art

[0002] A solenoid valve is an industrial device that uses electromagnetic force to control the flow of fluid. As a basic component of automation, it is a type of actuator and is not limited to hydraulic or pneumatic control. It consists of components such as an electromagnetic coil, a valve core, a spring, and a valve seat. When current passes through the electromagnetic coil, the coil generates electromagnetic force, attracting the valve core to move, thereby changing the flow direction or on-off state of the fluid.

[0003] The conduction current of the solenoid valve coil in the prior art is relatively large, which will cause the solenoid coil to heat up, and the heating of the solenoid coil will cause the low-temperature propellant to vaporize. Summary of the Invention

[0004] The embodiments of the present invention provide a solenoid valve control system, method and solenoid valve to solve the technical problem in the related art that the conduction current of the existing solenoid valve coil is large, the large current causes the solenoid coil to heat up, and the heating of the solenoid coil causes the vaporization of the low-temperature propellant.

[0005] In a first aspect, a solenoid valve control system is provided, comprising:

[0006] A first switch, a second switch, and a sampling resistor connected in series with the electromagnetic coil and the power supply of the electromagnetic valve;

[0007] A control circuit is connected to the first switch, the second switch, and the sampling resistor, and is configured as follows:

[0008] When the valve core of the solenoid valve is opened, the first switch and the second switch are controlled to be closed, the current flowing through the sampling resistor is obtained, and when the current reaches a first preset value, the second switch is controlled to be opened;

[0009] The second switch is then controlled to open or close according to the current, so that the current is within a preset range to maintain the valve core open.

[0010] In some embodiments, controlling the second switch to open or close according to the current so that the current is within a preset range to maintain the valve core open includes:

[0011] When the current reaches a second preset value, the second switch is controlled to be closed; when the current reaches a third preset value, the second switch is controlled to be opened, so that the current maintains the valve core open within a range between the second preset value and the third preset value;

[0012] The second preset value is smaller than the third preset value, and the third preset value is smaller than the first preset value.

[0013] In some embodiments, the first preset value is 0.8A to 0.9A, the second preset value is 0.2A to 0.3A, and the third preset value is 0.4A to 0.5A.

[0014] In some embodiments, the control circuit includes:

[0015] a voltage sampling circuit, connected to the sampling resistor and configured to collect the voltage across the sampling resistor;

[0016] A controller is connected to the voltage sampling circuit and is used to calculate the current flowing through the sampling resistor according to the voltage across the sampling resistor.

[0017] In some embodiments, the solenoid valve control system further includes:

[0018] A freewheeling circuit is connected to the second switch and the electromagnetic coil respectively, and is used to provide freewheeling for the electromagnetic coil when the second switch is disconnected.

[0019] In some embodiments, the freewheeling circuit includes:

[0020] a freewheeling diode, wherein a cathode of the freewheeling diode is connected to the second switch and the electromagnetic coil;

[0021] A freewheeling resistor, wherein a first end of the freewheeling resistor is connected to the anode of the freewheeling diode, and a second end of the freewheeling resistor is connected to the sampling resistor.

[0022] In a second aspect, a solenoid valve control method is provided, using the aforementioned solenoid valve control system, comprising the following steps:

[0023] When the valve core of the solenoid valve is opened, the first switch and the second switch are controlled to be closed, the current flowing through the sampling resistor is obtained, and when the current reaches a first preset value, the second switch is controlled to be opened;

[0024] The second switch is then controlled to open or close according to the current, so that the current remains within a preset range to maintain the valve core open.

[0025] In some embodiments, controlling the second switch to open or close according to the current so that the current remains within a preset range to maintain the valve core open includes:

[0026] When the current reaches a second preset value, the second switch is controlled to be closed; when the current reaches a third preset value, the second switch is controlled to be opened, so that the current maintains the valve core open within a range between the second preset value and the third preset value;

[0027] The second preset value is smaller than the third preset value, and the third preset value is smaller than the first preset value.

[0028] In a third aspect, a solenoid valve is provided, comprising the aforementioned solenoid valve control system, further comprising:

[0029] an upper valve body, wherein an electromagnetic coil is provided in the upper valve body;

[0030] The lower valve body is arranged at the bottom of the upper valve body, a valve core is provided between the upper valve body and the lower valve body, and the electromagnetic coil drives the valve core to reciprocate between the upper valve body and the lower valve body.

[0031] In some embodiments, the upper valve body, the lower valve body and the valve core are all made of soft magnetic alloy material.

[0032] The beneficial effects brought about by the technical solution provided by the present invention include:

[0033] An embodiment of the present invention provides a solenoid valve control system, method, and solenoid valve. The solenoid valve control system includes a first switch, a second switch, a sampling resistor, and a control circuit connected in series with a solenoid coil and a power supply of the solenoid valve. The control circuit is connected to the first switch, the second switch, and the sampling resistor and is configured to: when the valve core of the solenoid valve is opened, control the first switch and the second switch to be closed to obtain the current flowing through the sampling resistor; when the current reaches a first preset value, control the second switch to be opened; and then control the second switch to be opened or closed based on the current, so that the current maintains the valve core open within a preset range. The first switch and the second switch are controlled to be closed or opened by the control circuit based on the current of the solenoid coil, thereby reducing the conduction current of the solenoid coil, avoiding heating of the solenoid coil and vaporization of the cryogenic propellant, improving the stability of the solenoid valve operation, and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are 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.

[0035] Figure 1 A schematic diagram of a solenoid valve control system provided by an embodiment of the present invention;

[0036] Figure 2 A flow chart of a solenoid valve control method provided by an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a solenoid valve provided in an embodiment of the present invention;

[0038] Reference numerals:

[0039] 1. Solenoid valve; 11. Solenoid coil; 12. Valve core; 13. Upper valve body; 14. Lower valve body. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The embodiments of the present invention provide a solenoid valve control system, method and solenoid valve, which can solve the technical problem in the related art that the conduction current of the existing solenoid valve coil is large, the large current causes the solenoid coil to heat up, and the heating of the solenoid coil causes the vaporization of the low-temperature propellant.

[0042] Figure 1 An embodiment of the present invention provides a solenoid valve control system, comprising:

[0043] A first switch S0, a second switch S1, a sampling resistor R2, and a control circuit are connected in series with the electromagnetic coil 11 and the power supply of the electromagnetic valve 1. The control circuit is connected to the first switch S0, the second switch S1, and the sampling resistor R2, and is configured to: when the valve core 12 of the electromagnetic valve 1 is opened, control the first switch S0 and the second switch S1 to be closed, obtain the current flowing through the sampling resistor R2, control the second switch S1 to be opened when the current reaches a first preset value, and then control the second switch S1 to be opened or closed based on the current, so that the current remains within a preset range to maintain the valve core 12 open.

[0044] A solenoid valve control system according to an embodiment of the present invention includes a first switch, a second switch, a sampling resistor, and a control circuit connected in series with the solenoid coil and a power supply of the solenoid valve. The control circuit is connected to the first switch, the second switch, and the sampling resistor and is configured to: when the valve core of the solenoid valve is opened, control the first and second switches to be closed to obtain the current flowing through the sampling resistor; when the current reaches a first preset value, control the second switch to be opened; and then control the second switch to be opened or closed based on the current, so that the current remains within a preset range to maintain the valve core open. The first and second switches are controlled to be closed or opened by the control circuit based on the current of the solenoid coil, thereby reducing the conduction current of the solenoid coil, avoiding heating of the solenoid coil and vaporization of the cryogenic propellant, improving the stability of the solenoid valve operation, and reducing power consumption.

[0045] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the second switch is controlled to be opened or closed according to the current, so that the current maintains the valve core 12 open within a preset range, including: when the current reaches a second preset value, the second switch S1 is controlled to be closed, and when the current reaches a third preset value, the second switch S1 is controlled to be opened, so that the current maintains the valve core 12 open within the range of the second preset value and the third preset value, the second preset value is less than the third preset value, and the third preset value is less than the first preset value, the control circuit controls the first switch S0 and the second switch S1 to be closed, and the power supply is supplied to the electromagnetic coil 11 of the solenoid valve 1, that is, the inductor L and the resistor R1, through the first switch S0 and the second switch S1. The control circuit obtains the current flowing through the sampling resistor R2. When the When the current reaches a first preset value, the second switch S1 is controlled to be disconnected, and the power supply stops supplying power to the electromagnetic coil 11, and the current decreases. When the current decreases to a second preset value, the second switch S1 is controlled to be closed, and the power supply again supplies power to the electromagnetic coil 11 of the electromagnetic valve 1, that is, the inductor L and the resistor R1, through the first switch S0 and the second switch S1. When the current reaches a third preset value, the second switch S1 is controlled to be disconnected. The first preset value is the opening current of the electromagnetic valve 1, and the third preset value and the second preset value are the currents for maintaining the electromagnetic valve 1 in the open state. The second switch S1 is cyclically opened and closed between the third preset value and the second preset value, so that the current of the electromagnetic coil 11 is maintained within the range of the second preset value and the third preset value.

[0046] As an optional implementation, in one embodiment of the invention, see Figure 1As shown, the first preset value is 0.8A-0.9A, the second preset value is 0.2A-0.3A, and the third preset value is 0.4A-0.5A. 0.8A-0.9A is the opening current of the solenoid valve 1. When the current of the electromagnetic coil 11 reaches 0.8A-0.9A, the second switch S1 is disconnected; 0.2A-0.3A and 0.4A-0.5A are the currents for maintaining the solenoid valve 1 in the open state. When the current drops to 0.2A-0.3A, the second switch S1 is closed, and the power supply supplies power to the solenoid valve 1 again until the current rises to 0.4A-0.5A, when the second switch S1 is disconnected. The second switch S1 is cyclically opened and closed between 0.3A and 0.4A, so that the current of the electromagnetic coil 11 is maintained between 0.3A and 0.4A, thereby reducing the working current of the electromagnetic coil, avoiding heating of the electromagnetic coil and vaporization of the low-temperature propellant, and improving the stability of the solenoid valve.

[0047] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the control circuit includes: a voltage sampling circuit and a controller. The voltage sampling circuit is connected to the sampling resistor R2 and is used to collect the voltage across the sampling resistor R2. The controller is connected to the voltage sampling circuit and is used to calculate the current flowing through the sampling resistor R2 based on the voltage across the sampling resistor R2. After the voltage sampling circuit obtains the voltage across the sampling resistor R2, the controller can calculate the current flowing through the sampling resistor R2 based on the resistance value of the sampling resistor R2 and Ohm's law.

[0048] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the solenoid valve control system also includes: a freewheeling circuit, which is respectively connected to the second switch S1 and the electromagnetic coil 11, and is used to provide freewheeling for the electromagnetic coil 11 when the second switch S1 is disconnected. When the second switch S1 is disconnected, the electromagnetic coil 11, i.e., the inductor L and the resistor R1, forms a loop with the freewheeling circuit to provide freewheeling for the electromagnetic coil 11.

[0049] As an optional implementation, in one embodiment of the invention, see Figure 1As shown, the freewheeling circuit includes: a freewheeling diode D1 and a freewheeling resistor R3, the cathode of the freewheeling diode D1 is connected to the second switch S1 and the electromagnetic coil 11, the first end of the freewheeling resistor R3 is connected to the anode of the freewheeling diode D1, and the second end of the freewheeling resistor R3 is connected to the sampling resistor R2. When the second switch S1 is disconnected, the electromotive force at both ends of the electromagnetic coil 11, i.e., the inductor L, does not disappear immediately when the power is cut off. At this time, the residual electromotive force is released through the freewheeling diode D1 and the freewheeling resistor R3. At the same time, the cathode of the freewheeling diode D1 is connected to the second switch S1. When the second switch S1 is closed, the freewheeling diode D1 is cut off, and the freewheeling circuit is disconnected. The freewheeling circuit is only turned on when the second switch S1 is disconnected.

[0050] The embodiment of the present invention also provides a solenoid valve control method, using the above-mentioned solenoid valve control system, see Figure 2 As shown, the following steps are included:

[0051] Step S10, when the valve core 12 of the solenoid valve 1 is opened, the first switch S0 and the second switch S1 are controlled to be closed, the current flowing through the sampling resistor is obtained, and when the current reaches a first preset value, the second switch S1 is controlled to be opened;

[0052] In step S20 , the second switch S1 is controlled to be opened or closed according to the current, so that the current is within a preset range to maintain the valve core 12 open.

[0053] Specifically, when the valve core 12 of the solenoid valve 1 is opened, the first switch S0 and the second switch S1 are controlled to be closed to obtain the current flowing through the sampling resistor R2. When the current reaches a first preset value of 0.8A, the second switch S1 is controlled to be opened. Then, the second switch S1 is controlled to be opened or closed according to the current, so that the current is within a preset range of 0.3A and 0.4A to maintain the valve core 12 open. The first switch S0 and the second switch S1 are controlled to be closed or opened by the control circuit according to the current of the electromagnetic coil 11, thereby reducing the operating current of the electromagnetic coil 11 and maintaining the valve core 12 open within a preset range. The conduction current of the electromagnetic coil is reduced, heating of the electromagnetic coil and vaporization of the low-temperature propellant are avoided, and the operating stability of the solenoid valve is improved.

[0054] As an optional implementation, in one embodiment of the invention, see Figure 2As shown, the second switch is controlled to be opened or closed according to the current, so that the current maintains the valve core 12 open within a preset range, including: when the current reaches a second preset value, the second switch S1 is controlled to be closed, and when the current reaches a third preset value, the second switch S1 is controlled to be opened, so that the current maintains the valve core 12 open within the range of the second preset value and the third preset value, the second preset value is smaller than the third preset value, and the third preset value is smaller than the first preset value.

[0055] Specifically, the control circuit obtains the current flowing through the sampling resistor R2. When the current reaches a first preset value of 0.8A to 0.9A, the second switch S1 is controlled to be disconnected, and the power supply stops supplying power to the electromagnetic coil 11, and the current decreases. When the current decreases to a second preset value of 0.2A to 0.3A, the second switch S1 is controlled to be closed, and the power supply again supplies power to the electromagnetic coil 11, i.e., the inductor L and the resistor R1, through the first switch S0 and the second switch S1. When the current reaches a third preset value of 0.4A to 0.5A, the second switch S1 is controlled to be disconnected. The first preset value is the opening current of the solenoid valve, and the third preset value and the second preset value are the currents for maintaining the solenoid valve in the open state. The second switch S1 is cyclically opened and closed between the third preset value and the second preset value, thereby keeping the current of the electromagnetic coil within the range of the second preset value and the third preset value.

[0056] The embodiment of the present invention further provides a solenoid valve, including the solenoid valve control system described above, see Figure 3 As shown, it also includes: an upper valve body 13 and a lower valve body 14, an electromagnetic coil 11 is provided in the upper valve body 13, and the lower valve body 14 is provided at the bottom of the upper valve body 13. A valve core 12 is provided between the upper valve body 13 and the lower valve body 14, and the electromagnetic coil 11 drives the valve core 12 to reciprocate between the upper valve body 13 and the lower valve body 14. When the current of the electromagnetic coil 11 reaches 0.8A, the electromagnetic coil 11 drives the valve core 12 to open, and when the current of the electromagnetic coil 11 is maintained between 0.3A and 0.4A, the valve core 12 is maintained. The valve core 12 is in the open state. When the first switch S0 is disconnected, the valve core 12 is closed when the current of the electromagnetic coil 11 drops to 0A. In addition, the electromagnetic coil 11 adopts ultra-low temperature resistant enameled wire, and the lead-out cable of the electromagnetic coil 11 is protected by ultra-low temperature resistant insulating material. The electromagnetic coil 11 is encapsulated with an adhesive resistant to ultra-low temperature conditions. A magnetic isolation ring made of non-magnetic austenitic stainless steel is also provided between the valve core 12 and the electromagnetic coil 11, which improves the stability of the solenoid valve when working under ultra-low temperature conditions.

[0057] As an optional implementation, in one embodiment of the invention, see Figure 3 As shown, the upper valve body 13, the lower valve body 14 and the valve core 12 are all made of soft magnetic alloy material. Under ultra-low temperature conditions, the magnetic properties of the soft magnetic alloy material do not change significantly, the saturation magnetic induction intensity does not decrease significantly, and the residual magnetism does not increase significantly, thereby improving the stability of the solenoid valve under ultra-low temperature conditions.

[0058] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0059] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0060] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features of the present invention.

Claims

1. A solenoid valve control system, characterized in that: include: A first switch, a second switch, and a sampling resistor connected in series with the electromagnetic coil (11) of the electromagnetic valve (1) and the power supply; A control circuit is connected to the first switch, the second switch, and the sampling resistor, and is configured as follows: When the valve core (12) of the solenoid valve (1) is opened, the first switch and the second switch are controlled to be closed, the current flowing through the sampling resistor is obtained, and when the current reaches a first preset value, the second switch is controlled to be opened; Then, the second switch is controlled to be opened or closed according to the current, so that the current is within a preset range to maintain the valve core (12) open; When the current reaches a second preset value, the second switch is controlled to be closed, and when the current reaches a third preset value, the second switch is controlled to be opened, so that the current maintains the valve core (12) open within the range of the second preset value and the third preset value; The second preset value is smaller than the third preset value, and the third preset value is smaller than the first preset value; a freewheeling circuit, the freewheeling circuit being connected to the second switch and the electromagnetic coil (11) respectively, and being used for providing freewheeling to the electromagnetic coil (11) when the second switch is disconnected; The freewheeling circuit comprises: a freewheeling diode, wherein the cathode of the freewheeling diode is connected to the second switch and the electromagnetic coil (11); A freewheeling resistor, wherein a first end of the freewheeling resistor is connected to the anode of the freewheeling diode, and a second end of the freewheeling resistor is connected to the sampling resistor.

2. The solenoid valve control system according to claim 1, characterized in that: The first preset value is 0.8A-0.9A, the second preset value is 0.2A-0.3A, and the third preset value is 0.4A-0.5A.

3. The solenoid valve control system according to claim 1, characterized in that: The control circuit comprises: a voltage sampling circuit, connected to the sampling resistor and configured to collect the voltage across the sampling resistor; A controller is connected to the voltage sampling circuit and is used to calculate the current flowing through the sampling resistor according to the voltage across the sampling resistor.

4. A solenoid valve control method, using the solenoid valve control system according to claim 1, characterized in that: The following steps are involved: When the valve core (12) of the solenoid valve (1) is opened, the first switch and the second switch are controlled to be closed, the current flowing through the sampling resistor is obtained, and when the current reaches a first preset value, the second switch is controlled to be opened; Then, the second switch is controlled to open or close according to the current, so that the current is within a preset range to maintain the valve core (12) open; When the current reaches a second preset value, the second switch is controlled to be closed, and when the current reaches a third preset value, the second switch is controlled to be opened, so that the current maintains the valve core (12) open within the range of the second preset value and the third preset value; The second preset value is smaller than the third preset value, and the third preset value is smaller than the first preset value.

5. A solenoid valve, comprising the solenoid valve control system according to claim 1, characterized in that: Also includes: an upper valve body (13), wherein an electromagnetic coil (11) is provided in the upper valve body (13); A lower valve body (14) is provided at the bottom of the upper valve body (13), a valve core (12) is provided between the upper valve body (13) and the lower valve body (14), and the electromagnetic coil (11) drives the valve core (12) to reciprocate between the upper valve body (13) and the lower valve body (14).

6. The solenoid valve according to claim 5, characterized in that: The upper valve body (13), the lower valve body (14) and the valve core (12) are all made of soft magnetic alloy material.

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