Solenoid valve zero point automatic adjustment device, system and method

Abstract

The application provides a solenoid valve zero point automatic adjusting device, system and method. The solenoid valve zero point automatic adjusting device comprises a solenoid valve and an adjusting assembly. The solenoid valve comprises a coil, a moving iron core, an elastic member, a valve core and a valve body assembly. The inside of the valve body assembly forms an air inlet channel, an air outlet channel and a valve port. The first end of the moving iron core is arranged in the inside of the coil, and the second end of the moving iron core is connected with the valve core. The elastic member is connected with the second end of the moving iron core. The two ends of the valve port are respectively connected with the air inlet channel and the air outlet channel of the solenoid valve. The valve core can block or open the valve port under the joint action of the electromagnetic force of the coil and the elastic restoring force of the elastic member. The adjusting assembly is used for adjusting pressure. The pressure is the pressure for adjusting the blocking of the valve port by the valve core of the solenoid valve when the solenoid valve stops working. The adjusting assembly of the solenoid valve zero point automatic adjusting device can adjust the pressure for blocking the valve port by the valve core of the solenoid valve after the solenoid valve is assembled, so as to adjust the zero point of the solenoid valve.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and specifically to a solenoid valve zero-point automatic adjustment device, system, and method. Background Technology

[0002] As a crucial actuator for gas flow control in ventilators and anesthesia machines, the accuracy and reliability of solenoid valves determine the performance of these machines and directly affect the effectiveness of mechanical ventilation. The main working principle of a solenoid valve is to utilize the electromagnetic force generated when an electromagnetic coil is energized to overcome the elasticity of the internal spring plates, causing the valve core to move away from the valve orifice. Different solenoid valve currents correspond to different valve opening degrees, thereby achieving the purpose of controlling the flow output.

[0003] In existing technologies, manufacturing errors in the spring clips result in inconsistent strength performance, which in turn leads to inconsistent electromagnetic forces required for the solenoid valve to open. This results in inconsistent zero-point opening of the solenoid valve, directly affecting its flow control performance and consequently impacting the mechanical ventilation performance of ventilators and anesthesia machines. Currently, existing solenoid valves lack adjustment mechanisms after assembly to ensure consistent zero-point operation. Summary of the Invention

[0004] The main technical problem solved by this invention is that existing solenoid valves lack adjustment mechanisms after assembly to ensure the consistency of the zero point.

[0005] To address the aforementioned technical problems, this application provides an automatic zero-point adjustment device for a solenoid valve, comprising a solenoid valve and an adjustment assembly. The solenoid valve includes a coil, a moving iron core, an elastic element, a valve core, and a valve body assembly. The valve body assembly internally forms an inlet channel, an outlet channel, and a valve port. The first end of the moving iron core is disposed inside the coil, and the second end of the moving iron core is connected to the valve core, with the second end positioned opposite to the first end. The elastic element is connected to the second end of the moving iron core. The two ends of the valve port are respectively connected to the inlet channel and the outlet channel of the solenoid valve. The valve core, under the combined action of the electromagnetic force of the coil and the elastic restoring force of the elastic element, seals or opens the valve port. When the solenoid valve stops working, the adjustment assembly is used to adjust the pressure, which is the pressure exerted by the valve core of the solenoid valve on the valve port.

[0006] In one embodiment, the second end of the moving iron core and the valve core have a protrusion in one and an insertion channel in the other. The protrusion is inserted into the insertion channel and is interference-fitted with the insertion channel. The adjustment assembly includes an adjustment rod, the adjustment end of which is located on the side of the valve port away from the valve core. The adjustment end of the adjustment rod is used to push the valve core toward the end away from the valve port to adjust the depth of the protrusion inserted into the insertion channel.

[0007] In one embodiment, the adjusting assembly further includes an adapter seat fixed to the outer surface of the valve body assembly. The adapter seat has a through hole, and the adjusting end of the adjusting rod extends from the through hole into the valve body assembly, with the adjusting end of the adjusting rod facing the valve core.

[0008] In one embodiment, the two opposite ends of the valve port in the extension direction are respectively connected to the air inlet channel and the air outlet channel, the valve core is disposed inside the air outlet channel, the adjusting end of the adjusting rod passes through the air inlet channel and is disposed inside the valve port, the adjusting end of the adjusting rod has an air guide hole, and the two ends of the air guide hole are respectively connected to the air inlet channel and the valve port.

[0009] In one embodiment, the adjustment assembly includes a drive mechanism and an adjustment seat. The adjustment seat has a threaded hole extending along the direction of movement of the adjustment rod. The other end of the adjustment rod away from the adjustment end is threadedly connected to the threaded hole. The drive mechanism is used to drive the adjustment rod to make a helical motion in the threaded hole.

[0010] In one embodiment, the valve body assembly further includes a chamber connected to the air outlet channel; the valve core is located inside the air outlet channel, the elastic element is disposed in the chamber, the second end of the moving iron core passes through the chamber and is connected to the valve core, the valve core has an insertion channel that penetrates the valve core, the second end of the moving iron core is provided with an airflow channel communicating with the chamber, one end of the insertion channel faces the valve port and communicates with the valve port, and the other end of the insertion channel communicates with the airflow channel.

[0011] In one embodiment, the solenoid valve further includes a stationary iron core, a portion of which is fixedly disposed in the coil and another portion of which is disposed outside the coil. The stationary iron core is disposed on the side of the moving iron core away from the valve core to limit the movement of the moving iron core toward the side away from the valve port. The solenoid valve zero-point automatic adjustment device further includes a fixing component, which includes a fixing seat and a fixing member. The fixing member is fixed on the fixing seat, and one end of the fixing member has a fixing ball head that abuts against the end of the stationary iron core away from the moving iron core.

[0012] To address the aforementioned technical problems, this application also provides an automatic zero-point adjustment system for a solenoid valve, comprising an automatic zero-point adjustment device for a solenoid valve, a gas source, a switching valve, a flow sensor, and a controller. The automatic zero-point adjustment device for a solenoid valve is any of the aforementioned automatic zero-point adjustment devices. The gas source supplies gas to the inlet channel of the automatic zero-point adjustment device. The switching valve is disposed in the airflow passage between the inlet channel and the gas source to control the opening and closing of the airflow passage. The flow sensor monitors the flow rate of the airflow passing through the solenoid valve when the solenoid valve of the automatic zero-point adjustment device is operating. The controller is electrically connected to the switching valve, the automatic zero-point adjustment device, and the flow sensor. The controller controls the opening and closing of the switching valve, the operating state of the solenoid valve, and the adjustment of the regulating component based on the flow rate detected by the flow sensor. When the switching valve is closed and the solenoid valve stops operating, the regulating component adjusts the pressure, which is the pressure of the solenoid valve core sealing the valve port.

[0013] In one embodiment, the solenoid valve zero-point automatic adjustment system further includes a pressure reducing valve, which is disposed in the airflow passage between the switching valve and the solenoid valve; or, the switching valve is disposed in the airflow passage between the pressure reducing valve and the solenoid valve, and the pressure reducing valve is disposed between the air source and the switching valve; a flow sensor is used to monitor the flow rate of the airflow in the air inlet passage of the solenoid valve or to monitor the flow rate of the airflow in the air outlet passage.

[0014] To address the aforementioned technical problems, this application also provides a method for automatic zero-point adjustment of a solenoid valve, comprising:

[0015] Step S1: Control the opening of the switch valve;

[0016] Step S2: Control the solenoid valve to open with preset control parameters, and read the flow value of the solenoid valve monitored by the flow sensor;

[0017] Step S3: Based on the flow rate value of the solenoid valve monitored by the flow sensor, determine whether the flow rate value is within the preset flow rate range.

[0018] If the judgment result is negative, then execute step S4: control the switch valve to close, control the solenoid valve to close, control the regulating component to adjust the solenoid valve according to the preset step value, and then repeat steps S1 to S3 until the flow rate value is within the preset flow rate range.

[0019] If the judgment result is yes, then proceed to step S5: close the switching valve and the solenoid valve, and reset the control regulating component.

[0020] This application provides an automatic zero-point adjustment device for a solenoid valve, comprising a solenoid valve and an adjustment assembly. The solenoid valve includes a coil, a moving iron core, an elastic element, a valve core, and a valve body assembly. The valve body assembly internally forms an inlet channel, an outlet channel, and a valve port. The first end of the moving iron core is located inside the coil, and the second end of the moving iron core is connected to the valve core, with the second end positioned opposite to the first end. The elastic element is connected to the second end of the moving iron core. The two ends of the valve port are respectively connected to the inlet channel and the outlet channel of the solenoid valve. The valve core seals or opens the valve port under the combined action of the electromagnetic force of the coil and the elastic restoring force of the elastic element. When the solenoid valve stops working, the adjustment assembly is used to adjust the pressure, which is the pressure at which the valve core of the solenoid valve seals the valve port. In this application's automatic zero-point adjustment device, by setting an adjustment assembly, after the solenoid valve is assembled, the adjustment assembly can adjust the pressure at which the valve core of the solenoid valve seals the valve port, thereby adjusting the zero point of the solenoid valve. This ensures the consistency of the solenoid valve's zero point and compensates for the inconsistency in the zero point of the solenoid valve caused by inconsistent strength of the elastic element. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of an automatic zero-point adjustment device for a solenoid valve provided in an embodiment of this application;

[0022] Figure 2 for Figure 1 A sectional view;

[0023] Figure 3 A cross-sectional view of a solenoid valve provided in an embodiment of this application;

[0024] Figure 4 A structural block diagram of an automatic zero-point adjustment system for a solenoid valve provided in an embodiment of this application;

[0025] Figure 5 A flowchart of a method for automatic zero-point adjustment of a solenoid valve provided in an embodiment of this application. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0027] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0028] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0029] Please refer to Figure 1 and Figure 2 This application provides an automatic zero-point adjustment device for a solenoid valve. This device can be applied to the gas circuit of a ventilator or anesthesia machine. The device includes a solenoid valve 10 and an adjustment assembly 20.

[0030] The solenoid valve 10 includes a coil 11, a moving iron core 12, an elastic element 13, a valve core 14, and a valve body assembly 15. The valve body assembly 15 internally forms an inlet channel 151, an outlet channel 152, and a valve port 153. The two ends of the valve port 153 are respectively connected to the inlet channel 151 and the outlet channel 152 of the solenoid valve 10; that is, one end of the valve port 153 is connected to the inlet channel 151, and the other end is connected to the outlet channel 152. Here, the two ends of the valve port 153 can refer to… Figure 2 The two opposite ends of the valve port 153 shown in the diagram can also be similar to a three-way valve, with the two ends of the valve port 153 on the same side connected to the intake channel 151 and the exhaust channel 152 in the radial direction.

[0031] The first end 121 of the moving iron core 12 is disposed inside the coil 11, and the second end 122 of the moving iron core 12 is connected to the valve core 14. The second end 122 of the moving iron core 12 and the first end 121 of the moving iron core 12 are disposed opposite to each other along the direction of movement of the moving iron core 12. The elastic element 13 is connected to the second end 122 of the moving iron core 12 and is used to drive the moving iron core 12 to move toward the valve port 153. The elastic element 13 can be, for example, a sheet or a spring.

[0032] The valve core 14 blocks or opens the valve port 153 under the combined action of the electromagnetic force of the coil 11 and the elastic restoring force of the elastic element 13. When the coil 11 is not energized, the valve core 14 blocks the valve port 153 under the action of the elastic restoring force of the elastic element 13. When the coil 11 is energized, the moving iron core 12 moves away from the valve port 153 under the drive of the electromagnetic force. The moving iron core 12 drives the valve core 14 to open the valve port 153. The opening degree of the valve port 153 is determined according to the magnitude of the electromagnetic force, thereby regulating the gas flow through the solenoid valve 10.

[0033] When the solenoid valve 10 stops working, the adjusting component 20 is used to adjust the pressure, which is the pressure of the valve core 14 of the solenoid valve 10 blocking the valve port 153. Since the pressure of the valve core 14 of the solenoid valve 10 blocking the valve port 153 determines the zero point of the solenoid valve 10 when it stops working, the solenoid valve zero point automatic adjusting device of this application, by setting the adjusting component 20, after the solenoid valve 10 is assembled, the adjusting component 20 is used to adjust the pressure of the valve core 14 of the solenoid valve 10 blocking the valve port 153, thereby adjusting the zero point of the solenoid valve 10, ensuring the consistency of the zero point of the solenoid valve 10, and offsetting the inconsistency of the zero point of the solenoid valve 10 caused by the inconsistent strength of the elastic element 13.

[0034] In one embodiment, such as Figure 3 As shown, one of the moving iron core 12 and the valve core 14 has a protrusion 123 at the second end 122, and the other has an insertion channel 141. For example, in Figure 3 In the valve core 14, a protrusion 123 is provided on the end face of the second end 122 of the moving iron core 12 facing the valve core 14, and an insertion channel 141 is provided in the valve core 14. The protrusion 123 is inserted into the insertion channel 141 and is press-fitted with the insertion channel 141. Figure 1 , Figure 2 and Figure 3 As shown, the adjustment assembly 20 includes an adjustment rod 21. The adjustment end 211 of the adjustment rod 21 is located on the side of the valve port 153 away from the valve core 14. The adjustment end 211 of the adjustment rod 21 can push the valve core 14 toward the end away from the valve port 153 to adjust the depth of the protrusion 123 inserted into the insertion channel 141, thereby adjusting the degree of interference fit between the protrusion 123 and the insertion channel 141. Since the elastic element 13 is connected to the second end 122 of the moving iron core 12, the degree of interference fit between the protrusion 123 and the insertion channel 141 affects the elastic restoring force of the elastic element 13 on the second end 122 of the moving iron core 12, which in turn affects the initial squeezing degree between the valve core 14 and the valve port 153, thereby adjusting the pressure of the valve core 14 blocking the valve port 153 when the solenoid valve 10 is closed.

[0035] Typically, a certain adjustment space is reserved in advance during assembly. That is, the protrusion 123 is inserted into the insertion channel 141 shallowly during assembly. The valve core 14 can be pushed by the adjusting rod 21 according to the set step value, so that the protrusion 123 of the valve core 14 is gradually inserted into the insertion channel 141, thereby realizing the zero point adjustment of the solenoid valve 10. After the zero point adjustment of the solenoid valve 10, the adjusting rod 21 is separated from the valve core 14 and the adjusting rod 21 is reset.

[0036] In one embodiment, such as Figure 2 As shown, the end of the adjusting rod 21 facing the valve core 14 has a hemispherical structure. The hemispherical structure pushes the valve core 14, which can reduce the influence of the adjustment rod 21's misalignment during manufacturing and assembly on the adjustment.

[0037] In one embodiment, such as Figure 2 As shown, the regulating assembly 20 also includes an adapter 22. The valve body assembly 15 includes a housing 154 and a valve seat 155. The housing 154 is fixedly mounted on the valve seat 155. The housing 154 contains a valve core 14 and a valve port 153. The housing 154 and the valve seat 155 together form the air inlet channel 151 and the air outlet channel 152 of the solenoid valve 10. The adapter 22 is fixed to the outer surface of the housing 154. The adapter 22 has a through hole. The adjusting end 211 of the regulating rod 21 extends from the through hole into the valve body assembly 15, and the adjusting end 211 of the regulating rod 21 faces the valve core 14. The regulating rod 21 can extend and retract along the axial direction of the regulating rod 21, so that when the adjusting end 211 moves toward the valve core 14, it can lift the valve core 14, and when it moves away from the valve core 14, it separates from the valve core 14. By fixing the adjusting end 211 of the adjusting rod 21 with the adapter 22, the stability of the adjusting rod 21 during telescopic movement can be improved.

[0038] Furthermore, the regulating assembly 20 also includes a first seal 23 and a second seal 24. The first seal 23 is used to seal the connection between the adapter 22 and the valve body assembly 15, and the second seal 24 can be sleeved on the regulating rod 21 to seal the connection between the regulating rod 21 and the adapter 22. Since the regulating end 211 passes through the air inlet channel 151 and is located in the valve port 153, the first seal 23 and the second seal 24 are both used to prevent gas leakage from the regulating rod 21 or the adapter 22, thus ensuring the airtightness of the solenoid valve 10.

[0039] In one embodiment, such as Figure 2 and Figure 3As shown, the two opposite ends of the valve port 153 extending in the direction of extension are connected to the air inlet channel 151 and the air outlet channel 152, respectively. The valve core 14 is disposed inside the air outlet channel 152. The adjusting end 211 of the adjusting rod 21 passes through the through hole and the air inlet channel 151 in sequence and is disposed inside the valve port 153. The adjusting end 211 of the adjusting rod 21 has an air guide hole 212, the two ends of which are connected to the air inlet channel 151 and the valve port 153, respectively. Since the air flow cross section of the adjusting rod 21 becomes smaller when it passes through the air inlet channel 151, the air guide hole 212 on the adjusting end 211 can reduce the effect of the increased air resistance caused by the reduced air flow cross section after the adjusting rod 21 extends into the valve port 153.

[0040] In one embodiment, such as Figure 2 As shown, the adjustment assembly 20 includes a drive mechanism (not shown) and an adjustment seat 25. The adjustment seat 25 is disposed on the valve seat 155 and has a threaded hole extending along the telescopic movement direction of the adjustment rod 21. The other end of the adjustment rod 21 away from the adjustment end 211 is threadedly connected to the threaded hole. The drive mechanism is used to drive the adjustment rod 21 to make a helical motion in the threaded hole, so that the adjustment rod 21 rotates and telescopically moves to push the valve core 14 or separate from the valve core 14. Of course, in other embodiments, the adjustment rod 21 can also make a reciprocating linear sliding motion in the sliding seat. The adjustment assembly 20 can automatically adjust the step value through the cooperation of the drive mechanism, the adjustment seat 25 and the adjustment rod 21, thereby reducing the error caused by manual adjustment and improving production efficiency.

[0041] In one embodiment, such as Figure 3 As shown, the valve body assembly 15 also has a chamber 156 connected to the air outlet passage 152. Specifically, the valve body assembly 15 also includes a limiting member 157 and a diaphragm 158. A mounting cavity communicating with the air outlet passage 152 is provided on the side of the housing 154 away from the air inlet passage 151. The diaphragm 158 is located at the connection between the mounting cavity and the air outlet passage 152. One end of the limiting member 157 is located at the end of the mounting cavity away from the air outlet passage 152, and the other end of the limiting member 157 is located outside the mounting cavity. The limiting member 157, the diaphragm 158, and the cavity wall of the mounting cavity together form the chamber 156. The valve core 14 is located inside the air outlet passage 152. The second end 122 of the moving iron core 12 passes sequentially through the interior of the limiting member 157, the chamber 156, and connects to the valve core 14 in the air outlet passage 152. The elastic element 13 is fixedly installed in the chamber 156. The elastic element 13 can be a circular spring sheet. The elastic element 13 is sleeved on the second end 122 of the moving iron core 12.

[0042] An insertion channel 141 is formed inside the valve core 14, and the second end 122 of the moving iron core 12 is provided with an airflow channel 1221 communicating with the chamber 156. One end of the insertion channel 141 faces the valve port 153 and communicates with the valve port 153, while the other end of the insertion channel 141 communicates with the airflow channel 1221. Thus, when the solenoid valve 10 is not energized, the gas flowing into the intake channel 151 will flow from the insertion channel 141 of the valve core 14 to the airflow channel 1221, and finally flow into the chamber 156, causing the air pressure in the chamber 156 to increase. The solenoid valve 10 can use the high-pressure gas in the chamber 156 to assist the elastic element 13 in sealing the valve port 153.

[0043] In one embodiment, such as Figure 2 and Figure 3 As shown, the solenoid valve 10 also includes a stationary iron core 16. A portion of the stationary iron core 16 is fixedly disposed in the coil 11, and another portion is disposed outside the coil 11. The stationary iron core 16 is disposed on the side of the moving iron core 12 away from the valve core 14 to limit the movement of the moving iron core 12 toward the side away from the valve port 153. The stationary iron core 16 being disposed in the coil 11 can also increase the magnetic flux of the coil 11, thereby increasing the electromagnetic force of the coil 11 on the moving iron core 12.

[0044] The solenoid valve zero-point automatic adjustment device also includes a fixing component 17, which includes a fixing seat 171 and a fixing member 172. The fixing seat 171 is fixed to the valve seat 155, and the fixing member 172 is fixed to the fixing seat 171. One end of the fixing member 172 has a fixing ball head, which abuts against the end of the stationary iron core 16 away from the moving iron core 12 to limit the stationary iron core 16. By setting one end of the fixing member 172 to be spherical, the fixing ball head makes point contact with the stationary iron core 16, which, compared to surface contact, ensures that the stationary iron core 16 is not flattened or deformed.

[0045] To solve the above technical problems, such as Figure 4 As shown, this application also provides a solenoid valve automatic zero-point adjustment system. This system includes a solenoid valve automatic zero-point adjustment device, an air source 30, a switching valve 40, a flow sensor 50, and a controller 60. The solenoid valve automatic zero-point adjustment device can be a two-position, two-way solenoid valve with reduced pressure. The structure of the solenoid valve automatic zero-point adjustment device is the same as or similar to that of any of the embodiments described above, and it can achieve the same or similar effects; therefore, further details are omitted here.

[0046] The gas source 30 supplies gas, such as air or oxygen, to the air inlet channel 151 of the solenoid valve automatic zero-point adjustment device. A switching valve 40 is disposed in the airflow passage between the air inlet channel 151 and the gas source 30 to control the opening and closing of the airflow passage. A flow sensor 50 monitors the flow rate of the airflow passing through the solenoid valve 10 when the solenoid valve 10 of the automatic zero-point adjustment device is operating. The flow sensor 50 can be a high-pressure resistant model, and it monitors either the flow rate of the airflow in the air inlet channel 151 or the flow rate of the airflow in the air outlet channel 152 of the solenoid valve 10.

[0047] The controller 60 is electrically connected to the switching valve 40, the solenoid valve zero-point automatic adjustment device, and the flow sensor 50. The controller 60 controls the opening and closing of the switching valve 40, the operating state of the solenoid valve 10, and the adjustment of the regulating component 20 based on the flow rate detected by the flow sensor 50. When the switching valve 40 is closed and the solenoid valve 10 stops working, the regulating component 20 adjusts the pressure, which is the pressure of the valve core 14 of the solenoid valve 10 sealing the valve port 153. Controlling the operating state of the solenoid valve 10 can include controlling its opening and closing (energizing or de-energizing the control coil 11) and controlling the current of the control coil 11 (given a specific PWM control parameter signal to the solenoid valve 10). The adjustment of the regulating component 20 can be achieved by the drive mechanism of the regulating component 20 driving the adjusting rod 21 to move by a certain step value.

[0048] The solenoid valve zero-point automatic adjustment system of this application can automatically adjust the zero point of the solenoid valve 10 according to the flow rate detected by the flow sensor 50, ensuring the consistency of the opening zero point of the solenoid valve 10 and preventing the problem of poor zero-point consistency caused by different strengths of the spring. Furthermore, the adjustment component 20 can automatically adjust the step value, thereby reducing errors caused by manual adjustment and improving production efficiency.

[0049] In one embodiment, the solenoid valve zero-point automatic adjustment system further includes a pressure reducing valve 70, which is disposed in the airflow passage between the switching valve 40 and the solenoid valve 10. Alternatively, the switching valve 40 is disposed in the airflow passage between the pressure reducing valve 70 and the solenoid valve 10, and the pressure reducing valve 70 is disposed between the gas source 30 and the switching valve 40. The pressure reducing valve 70 can reduce the pressure of the gas flowing out of the gas source 30 to the pressure value required by the air inlet passage 151 of the solenoid valve 10.

[0050] Please refer to Figure 5 This application also provides a method for automatic zero-point adjustment of a solenoid valve, comprising:

[0051] Step S1: Control switch valve 40 to open;

[0052] Step S2: Control the solenoid valve 10 to open with preset control parameters, and read the flow value of the solenoid valve 10 monitored by the flow sensor 50;

[0053] The preset control parameters can be specified PWM control parameters. The adjustment of the PWM control parameters of the solenoid valve 10 is to change the magnitude of the current in the coil 11 of the solenoid valve 10 by controlling the high and low level time ratio of the PWM signal, thereby controlling the opening, closing and opening degree of the solenoid valve 10.

[0054] Step S3: Based on the flow rate value of the solenoid valve 10 monitored by the flow sensor 50, determine whether the flow rate value is within the preset flow rate range.

[0055] If the judgment result is negative, then step S4 is executed: control the switch valve 40 to close, control the solenoid valve 10 to close, control the regulating component 20 to adjust the solenoid valve 10 according to the preset step value, and then repeat steps S1 to S3 until the flow rate is within the preset flow rate range.

[0056] If the judgment result is yes, then execute step S5: close the switching valve 40 and the solenoid valve 10, and reset the control regulating component 20.

[0057] In one embodiment, when the judgment result is yes, in step S5, the flow value of the solenoid valve 10 under the preset control parameters can also be saved so as to retain the data of the adjustment record.

[0058] The method of automatic zero-point adjustment of the solenoid valve can be implemented by the controller 60 of the automatic zero-point adjustment system of the solenoid valve. The controller 60 can be integrated into the adjustment component 20 or written into a computer and electrically connected to the adjustment component 20 through the computer serial port in order to save more adjustment data.

[0059] The automatic zero-point adjustment method for the solenoid valve of this application can automatically adjust the zero point of the solenoid valve 10 according to the flow rate detected by the flow sensor 50, ensuring the consistency of the zero point opening of the solenoid valve 10 and preventing the problem of poor zero-point consistency caused by different strengths of the spring. Furthermore, the adjustment component 20 can automatically adjust the step value, thereby reducing errors caused by manual adjustment and improving production efficiency.

[0060] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A solenoid valve zero point automatic adjusting device, characterized by, The electromagnetic valve comprises a coil, a moving iron core, an elastic member, a valve core and a valve body assembly, the inside of the valve body assembly forms an inlet passage, an outlet passage and a valve port, the first end of the moving iron core is arranged in the inside of the coil, the second end of the moving iron core is connected with the valve core, and the second end is arranged opposite to the first end; the elastic member is connected with the second end of the moving iron core, the two ends of the valve port are respectively connected with the inlet passage and the outlet passage of the electromagnetic valve, and the valve core is closed or opened under the joint action of the electromagnetic force of the coil and the elastic restoring force of the elastic member. The adjusting assembly is used for adjusting the pressure when the electromagnetic valve stops working, and the pressure is the pressure of the valve core closing the valve port. The second end of the moving iron core and one of the valve cores have a protrusion, and the other has an insertion channel, the protrusion is inserted into the insertion channel and connected with the insertion channel in interference fit, the adjusting assembly comprises an adjusting rod, the adjusting end of the adjusting rod is arranged on the side of the valve port away from the valve core, and the adjusting end of the adjusting rod is used for pushing the valve core to move towards the end away from the valve port to adjust the depth of the protrusion inserted into the insertion channel. The opposite ends of the valve port in the extension direction are respectively connected with the inlet passage and the outlet passage, the valve core is arranged in the inside of the outlet passage, the adjusting end of the adjusting rod is arranged in the inside of the valve port through the inlet passage, the adjusting end of the adjusting rod has a gas guide hole, and the two ends of the gas guide hole are respectively communicated with the inlet passage and the valve port. The adjusting assembly further comprises an adapter seat, the adapter seat is fixed on the outside of the valve body assembly, the adapter seat is provided with a through hole, the adjusting end of the adjusting rod extends into the valve body assembly from the through hole, and the adjusting end of the adjusting rod faces the valve core.

2. The electromagnetic valve zero-point automatic adjusting device according to claim 1, characterized in that, The adjusting assembly comprises a driving mechanism and an adjusting seat, the adjusting seat has a threaded hole extending along the movement direction of the adjusting rod, the other end of the adjusting rod away from the adjusting end is screwed with the threaded hole, and the driving mechanism is used for driving the adjusting rod to make spiral movement in the threaded hole.

3. The electromagnetic valve zero point automatic adjustment device according to claim 1, characterized by, The inside of the valve body assembly further forms a chamber connected with the outlet passage; the valve core is arranged in the inside of the outlet passage, the elastic member is arranged in the chamber, the second end of the moving iron core is connected with the valve core through the chamber, the inside of the valve core forms an insertion channel penetrating the valve core, the second end of the moving iron core is provided with an air flow channel communicated with the chamber, one end of the insertion channel faces the valve port and is communicated with the valve port, and the other end of the insertion channel is communicated with the air flow channel.

4. The electromagnetic valve zero-point automatic adjusting device according to claim 1, characterized by, ​ 5. The electromagnetic valve zero point automatic adjustment device according to claim 1, characterized by, The electromagnetic valve further comprises a static core, one part of the static core is fixedly arranged in the coil, another part of the static core is arranged outside the coil, and the static core is arranged on the side of the moving core away from the valve core to limit the movement of the moving core towards the side away from the valve port; the electromagnetic valve zero point automatic adjusting device further comprises a fixing assembly, the fixing assembly comprises a fixing seat and a fixing piece, the fixing piece is fixed to the fixing seat, one end of the fixing piece is provided with a fixing ball head, and the fixing ball head abuts against one end of the static core away from the moving core.

6. A solenoid valve zero point automatic adjustment system, characterized by, Comprise: The electromagnetic valve zero point automatic adjusting device is the electromagnetic valve zero point automatic adjusting device according to any one of claims 1-5; The gas source is used for providing gas to the gas inlet channel of the electromagnetic valve zero point automatic adjusting device; The on-off valve is arranged on the gas flow passage between the gas inlet channel and the gas source, and is used for controlling the opening and closing of the gas flow passage; The flow sensor is used for monitoring the flow value of the gas flow passing through the electromagnetic valve when the electromagnetic valve of the electromagnetic valve zero point automatic adjusting device works; And the controller is electrically connected with the on-off valve, the electromagnetic valve zero point automatic adjusting device and the flow sensor, the controller is used for controlling the opening and closing of the on-off valve, the working state of the electromagnetic valve and the adjustment of the adjusting assembly according to the flow value detected by the flow sensor, and the adjusting assembly is used for adjusting the pressure when the on-off valve is closed and the electromagnetic valve stops working, and the pressure is the pressure of the valve core blocking the valve port.

7. The electromagnetic valve zero point automatic adjustment system of claim 6, wherein, The electromagnetic valve zero point automatic adjusting system further comprises a pressure reducing valve, the pressure reducing valve is arranged on the gas flow passage between the on-off valve and the electromagnetic valve, or the on-off valve is arranged on the gas flow passage between the pressure reducing valve and the electromagnetic valve, and the pressure reducing valve is arranged between the gas source and the on-off valve; the flow sensor is used for monitoring the flow value of the gas flow in the gas inlet channel of the electromagnetic valve or monitoring the flow value of the gas flow in the gas outlet channel.

8. A method for automatically adjusting the zero point of a solenoid valve, applied to the automatic zero point adjusting device for a solenoid valve according to any one of claims 1 to 5, characterized by, Comprise: Step S1: control the on-off valve to open; Step S2: control the electromagnetic valve to open with preset control parameters, and read the flow value of the electromagnetic valve monitored by the flow sensor; Step S3: according to the flow value of the electromagnetic valve monitored by the flow sensor, it is judged whether the flow value is in the preset flow range value; If the judgment result is no, then execute step S4: control the on-off valve to close, control the electromagnetic valve to close, control the adjusting assembly to adjust the electromagnetic valve according to the preset step value, and repeat the steps S1-S3 until the flow value is in the preset flow range value; If the judgment result is yes, then execute step S5: close the on-off valve and the electromagnetic valve, and control the adjusting assembly to reset.

Images