Solenoid valve with differential pressure sensor

Abstract

This application discloses a solenoid valve with a differential pressure sensor for use in an oil and gas recovery system. The solenoid valve includes a valve body, a differential pressure sensor, and a valve core. The valve body includes an upper valve cover, a middle partition, and a lower valve cover, dividing the interior of the valve body into an upper accommodating cavity and a lower accommodating cavity. A differential pressure through-hole is formed in the middle partition, and one side of the differential pressure sensor is connected to the differential pressure through-hole. The air port located in the upper accommodating cavity is a high-pressure air port, which is connected to the air inlet. The air port located in the lower accommodating cavity is a low-pressure air port, which is connected to the air outlet. The differential pressure sensor is used to monitor the pressure difference between the air inlet and the air outlet. This application achieves the same effect as the original design while having a simpler configuration. The differential pressure sensor and the solenoid valve's air inlet and outlet are integrally formed, reducing space and making the product smaller, lighter, and lower in cost.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and in particular to a solenoid valve with a differential pressure sensor that makes the air-fuel ratio of an engine more stable. Background Technology

[0002] Onboard Refueling Vapor Recovery (ORVR) is a vehicle vapor recovery management system that collects fuel vapors emitted from the fuel tank during refueling and vapor evaporation. Currently, volatile organic compounds (VOCs) from gasoline, also known as volatile HC compounds, are one of the main sources of air pollution in first-tier cities in my country, causing harm to human health and serving as precursors to photochemical smog. Europe and the United States began research and improvement work related to vapor recovery in the 1970s, achieving considerable economic and environmental benefits.

[0003] With the rapid development of the domestic economy and the mandatory implementation of the new generation of emission standards, the contradiction between the increase in car ownership and serious environmental pollution has intensified. Improving the utilization rate of fuel vapor and reducing HC compound emissions has become an urgent industry problem to be solved.

[0004] In the existing technology, motor vehicles produced in my country use desorption solenoid valves, and their desorption control mainly relies on ECM control. Since engine speed affects the negative pressure at the engine intake end, and the increase in vehicle body temperature at high engine speed will also lead to an increase in fuel vapor, the fuel tank pressure will also rise. The pressure difference across the valve port of the desorption solenoid valve is extremely unstable. Therefore, the operation of the desorption solenoid valve needs to refer to the parameters of engine speed, water tank temperature, and fuel tank pressure. Each parameter needs to meet specific conditions, making the control system complex and not conducive to the stable operation of oil and gas desorption.

[0005] Therefore, there is room for improvement in the desorption solenoid valves used in existing automotive refueling vapor recovery systems. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to provide a solenoid valve for an oil and gas recovery system, incorporating a differential pressure sensor to stabilize the air-fuel ratio of the engine, thereby resolving the problems of the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A solenoid valve with a differential pressure sensor is used in an oil and gas recovery system. The solenoid valve includes a valve body, a differential pressure sensor, and a valve core. The differential pressure sensor and the valve core are disposed on the valve body. The valve body includes an upper valve cover, a middle partition, and a lower valve cover, which divide the interior of the valve body into an upper accommodating cavity and a lower accommodating cavity. The upper valve cover includes an air inlet connected to the upper accommodating cavity, and the lower valve cover includes an exhaust port connected to the lower accommodating cavity. The middle partition has a valve through hole, and the moving core assembly of the valve core is movably connected to... The valve through-hole is connected to the middle partition plate, which also has a differential pressure through-hole. Axially protruding differential pressure ports are formed on both sides of the differential pressure through-hole. One side of the differential pressure sensor is connected to the differential pressure through-hole. The differential pressure port in the upper accommodating cavity is the high-pressure port of the differential pressure sensor, and the high-pressure port is connected to the inlet. The differential pressure port in the lower accommodating cavity is the low-pressure port of the differential pressure sensor, and the low-pressure port is connected to the exhaust port. The differential pressure sensor is used to monitor the pressure difference between the inlet and the exhaust port.

[0009] Furthermore, the differential pressure sensor is disposed within the lower accommodating cavity, located in the quiescent region of the airflow field.

[0010] Furthermore, the partition plate has axially protruding valve air passages on both sides of the valve through hole. The valve air passage opening is located on the side of the upper accommodating cavity as the valve inlet and on the side of the lower accommodating cavity as the valve outlet. The high-pressure air port of the differential pressure sensor is arranged side by side with the valve inlet, and the low-pressure air port of the differential pressure sensor is arranged side by side with the valve outlet.

[0011] Furthermore, the solenoid valve also includes a differential pressure sensor connector, which is electrically connected to the differential pressure sensor and is used to output information from the differential pressure sensor.

[0012] Furthermore, the solenoid valve also includes a solenoid valve connector, which is electrically connected to the valve core and is used to receive PWM signals to control the output of fluid in the valve core.

[0013] Furthermore, the valve core also includes: a spring, a coil assembly, and a sealing component; the coil assembly includes a coil, a coil frame, a stop, a cover plate, a valve seat, and a yoke that wraps the coil, and the stop is fixedly connected to a guide shaft; the coil assembly is covered with plastic, one end of the coil is inserted into the stop and cooperates with the cover plate, the other end of the coil cooperates with the valve seat, the valve seat is connected to the yoke, and the yoke completely wraps the coil, and the moving core assembly is slidably connected to the guide shaft.

[0014] Furthermore, a one-way diaphragm is provided at the exhaust port of the solenoid valve.

[0015] Furthermore, a filter screen is provided at the air inlet of the solenoid valve.

[0016] The purpose of this application is to design a more efficient solenoid valve. The pressure difference between its inlet and outlet is monitored by a differential pressure sensor inside the solenoid valve. When the engine reaches high speed, the solenoid valve starts to work, and the desorption flow rate changes with the pressure difference. The larger the pressure difference, the lower the duty cycle of the proportional solenoid valve, thereby ensuring that the intake air volume of the oil vapor mixture entering the engine tends to a steady-state value, thus making the air-fuel ratio (A / F) of the engine more stable. This solves the problem of the relatively complex and demanding desorption conditions of existing desorption solenoid valves, simplifies the desorption process, and improves the desorption efficiency of oil and gas from the design, thereby improving the reliability of the oil and gas desorption valve and reducing oil and gas emissions.

[0017] The specific objectives achieved by this application include the following:

[0018] 1. By integrating the differential pressure sensor into the solenoid valve, the functions of the two pressure sensors in the existing design can be completely replaced by the differential pressure sensor, which can meet the original design effect, while simplifying the configuration and improving the reliability of the carbon canister desorption function.

[0019] 2. Arrange the high-pressure port and low-pressure port of the differential pressure sensor and the valve device of the solenoid valve side by side. That is, one end of the pressure port of the differential pressure sensor monitors the pressure at the inlet of the solenoid valve, and the other end of the pressure port of the differential pressure sensor monitors the pressure at the outlet of the solenoid valve. By observing whether the signal of the differential pressure sensor changes, the working status of the solenoid valve can be determined, thereby realizing the fault detection of the solenoid valve.

[0020] Third, the differential pressure sensor is located at the inlet and outlet of the solenoid valve and can provide real-time feedback on the differential pressure between the inlet and outlet of the solenoid valve, thus providing favorable conditions for the precise adjustment of the output flow of the solenoid valve.

[0021] Fourth, the differential pressure sensor and the solenoid valve inlet and outlet are integrally molded, reducing the space required for both to coexist, making the product more compact and lightweight.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] 1. This application achieves the same effect as the original design while simplifying the configuration. The differential pressure sensor and the inlet and outlet of the solenoid valve are integrated into one piece, reducing the space for both to coexist. The product is smaller, lighter, and less expensive.

[0024] 2. This application simplifies the desorption process and improves the desorption efficiency of oil and gas from a design perspective;

[0025] 3. This application ensures that the intake air volume of the oil vapor mixture entering the engine tends to a steady-state value, thereby achieving precise adjustment of the output flow of the solenoid valve and making the air-fuel ratio of the engine more stable.

[0026] 4. This application improves the reliability of the oil and gas desorption valve and reduces oil and gas emissions;

[0027] 5. This application determines the working status of the solenoid valve by checking whether the signal of the differential pressure sensor changes, thereby realizing the fault detection of the solenoid valve.

[0028] Of course, implementing any specific embodiment of the present invention does not necessarily have all of the above technical effects at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the appearance of the solenoid valve in this application;

[0031] Figure 2 for Figure 1 The main view;

[0032] Figure 3 for Figure 1 Rear view;

[0033] Figure 4 for Figure 2 AA section diagram;

[0034] Figure 5 for Figure 2 Middle BB section view;

[0035] Figure 6 for Figure 5 Enlarged view of part of the image;

[0036] Figure 7 This is a partial structural schematic diagram of the solenoid valve in this application;

[0037] Figure 8 This is a schematic diagram of the oil and gas emission process in the oil tank when the solenoid valve is fully open;

[0038] Figure 9 This is a schematic diagram of the initial differential pressure of the solenoid valve and the corresponding control duty cycle.

[0039] Figure 10 This is a schematic diagram of the flow output curve precisely controlled by a solenoid valve.

[0040] Figure 11 This is a schematic diagram of the pressure change curve caused by the desorption process;

[0041] Figure 12 This is a schematic diagram of the duty cycle control curve based on the differential pressure feedback value. Detailed Implementation

[0042] The following describes several preferred embodiments of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To provide the public with a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments, but those skilled in the art will fully understand the present invention without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of the present invention, well-known methods, processes, procedures, elements, etc., are not described in detail.

[0043] Please refer to Figures 1 to 7 The figures show the external schematic and cross-sectional view of the solenoid valve of this application. The solenoid valve with a differential pressure sensor of this application is used in an oil and gas recovery system. As shown in the figures, the solenoid valve includes: a valve body, a differential pressure sensor 20, and a valve core 3; the differential pressure sensor 20 and the valve core 3 are disposed on the valve body, as shown in the figures. Figure 5 As shown, for ease of explanation, the present application Figure 5 This is a schematic diagram showing a 90-degree counterclockwise rotation. The differential pressure sensor 20 and the valve core 3 are disposed inside the valve body; as shown... Figure 4 and Figure 5 As shown, the valve body includes an upper valve cover 11, a middle partition 12, and a lower valve cover 13. The middle partition 12 is located between the upper valve cover 11 and the lower valve cover 13. The upper valve cover 11, the middle partition 12, and the lower valve cover 13 divide the interior of the valve body into an upper accommodating cavity and a lower accommodating cavity. Figure 5 In this context, the upper accommodating cavity is the accommodating space between the upper valve cover 11 and the middle partition 12, and the lower accommodating cavity is the accommodating space between the lower valve cover 13 and the middle partition 12.

[0044] Additionally, the upper valve cover 11 includes an air inlet 111 connected to the upper accommodating cavity. During operation, fluid enters the upper accommodating cavity through the air inlet 111 to create pressure. The lower valve cover 13 includes an exhaust port 131 connected to the lower accommodating cavity. In this embodiment, there are two exhaust ports 131, but this cannot be used to limit the scope of this application. During operation, fluid is discharged from the solenoid valve through the exhaust port 131. Figure 6In the middle partition 12, a valve through hole 121 is provided, and the moving core assembly 31 of the valve core 3 is movably connected to the valve through hole 121. The opening and closing of the moving core assembly 31 and the valve through hole 121 determines the flow of fluid through the valve through hole 121.

[0045] Figure 5 In this embodiment, the partition plate 12 also has a differential pressure through hole 122. The partition plate 12 has axially protruding differential pressure ports on both sides around the differential pressure through hole 122. One side of the differential pressure sensor 20 is connected to the differential pressure through hole 122. In this embodiment, the differential pressure sensor 20 is mounted in the lower accommodating cavity. The differential pressure port in the upper accommodating cavity is the high-pressure port 21 of the differential pressure sensor 20, and the high-pressure port 21 is connected to the inlet 111. The differential pressure port in the lower accommodating cavity is the low-pressure port 22 of the differential pressure sensor 20, and the low-pressure port 22 is connected to the exhaust port 131. The differential pressure sensor 20 is used to monitor the pressure difference between the intake port 111 and the exhaust port 131, that is, the pressure difference between the high-pressure port 21 and the low-pressure port 22. The gas output flow rate of the solenoid valve is determined based on the feedback value of the differential pressure sensor 20. In other words, the opening and closing state of the solenoid valve can be judged according to the signal change of the differential pressure sensor 20. In some embodiments, this is beneficial to the stable operation of oil-gas desorption. In addition, in some embodiments, it can ensure that the amount of air-fuel mixture entering the engine tends to a steady-state value, thereby making the air-fuel ratio of the engine more stable. Furthermore, in some embodiments, this can be used to complete the fault check of the solenoid valve.

[0046] Figure 5 In this configuration, the differential pressure sensor 20 is disposed within the lower accommodating cavity, located in the stagnant flow region of the airflow field. This means it is situated inside the solenoid valve, away from the air inlet, air outlet, and narrow flow areas, in a region with relatively stable pressure. Simultaneously, the high-pressure port 21 and low-pressure port 22 of the differential pressure sensor are provided with axially protruding pipe differential pressure ports. The pipe wall of the pipe differential pressure ports forms a baffle to prevent the gas flow from directly impacting the differential pressure sensor 20. This reduces the sensing error of the differential pressure sensor 20 caused by turbulent gas flow, thereby enabling it to detect the true differential pressure value between the solenoid valve's air inlet and air outlet.

[0047] Figure 6In this configuration, the partition plate 12 has axially protruding valve air passages on both sides of the valve through hole 121. The valve air passage opening is located on the upper accommodating cavity side as the valve inlet 1211 and on the lower accommodating cavity side as the valve outlet 1212. The high-pressure port 21 of the differential pressure sensor 20 is arranged side by side with the valve inlet 1211, and the low-pressure port 22 of the differential pressure sensor 20 is arranged side by side with the valve outlet 1212. During operation, fluid enters the upper accommodating cavity from the air inlet 111, and when the moving core assembly 31 and the valve through hole 121 are in the open state, it enters from the valve inlet 1211 and flows into the lower accommodating cavity from the valve outlet 1212, and then exits from the exhaust port 131.

[0048] like Figure 1 As shown, the solenoid valve also includes a differential pressure sensor connector 4, which is electrically connected to the differential pressure sensor 20 and is used to output information from the differential pressure sensor 20, such as outputting information to the vehicle computer (vehicle control unit). Furthermore, the solenoid valve also includes a solenoid valve connector 5, which is electrically connected to the valve core 3 and is used to receive PWM signals to control the output of fluid from the valve core. For example, the vehicle computer converts the information from the differential pressure sensor 20 into a PWM signal. The solenoid valve is controlled by a PWM signal, and the duty cycle of the PWM signal can be adjusted according to the feedback value of the differential pressure sensor 20. Simultaneously, the operating state of the solenoid valve can be confirmed based on the signal change value of the differential pressure sensor, precisely controlling the output of fluid from the solenoid valve's exhaust port. For example, if the real-time feedback value of the differential pressure sensor increases, the duty cycle of the solenoid valve's PWM signal decreases; if the real-time feedback value of the differential pressure sensor decreases, the duty cycle of the solenoid valve's PWM signal increases.

[0049] like Figure 6 As shown, the valve core 3 further includes: a spring 32, a coil assembly 33, and a sealing component 34; the coil assembly 33 includes a coil, a coil frame, a stop, a cover plate, a valve seat, and a yoke that wraps the coil, and the stop is fixedly connected to a guide shaft; the coil assembly 33 is covered with plastic, one end of the coil is inserted into the stop and cooperates with the cover plate, the other end of the coil cooperates with the valve seat, the valve seat is connected to the yoke, and the yoke completely wraps the coil, and the moving core assembly 31 is slidably connected to the guide shaft.

[0050] like Figure 7 As shown, a one-way diaphragm 6 is provided at the exhaust port 131 of the solenoid valve. The function of the one-way diaphragm 6 is to prevent fluid from flowing back into the valve body. Additionally, as... Figure 5As shown, a filter screen 7 is provided at the air inlet of the solenoid valve. The function of the filter screen 7 is to prevent impurities in the fluid from being discharged from the valve body and affecting the efficiency of the oil and gas recovery system.

[0051] The following implementation details illustrate the positive effects of the solenoid valve described in this application.

[0052] Implementation Status 1:

[0053] 1. Figure 8 In this scenario, when the 100-liter fuel tank is under high pressure (the differential pressure sensor reports a large differential pressure value), if the solenoid valve is fully open, a large amount of fuel vapor will be drawn into the engine (the fuel tank depressurization process when the solenoid valve is fully open is as follows). Figure 8 As shown, from 35 kPa to 2 kPa, a lower duty cycle control signal is given to the solenoid valve, thereby reducing the amount of gas output by the solenoid valve. Consequently, the amount of air-fuel mixture in the engine intake decreases, thus bringing the air-fuel ratio to a safe range. Figure 9 This is a schematic diagram of the initial differential pressure of the solenoid valve and the corresponding control duty cycle. The lines in the diagram represent the purging process.

[0054] 2. As the desorption process proceeds, the tank pressure decreases, and the feedback value of the differential pressure sensor also decreases accordingly. Figure 11 As shown, the fuel tank pressure line and differential pressure line are displayed at a vehicle speed of 40 km / h. Based on the rate of decrease in differential pressure from the differential pressure sensor, the duty cycle of the control solenoid valve is gradually increased (e.g., ...). Figure 12 The exhaust process diagram shown (solid line represents pressure difference, broken line represents duty cycle) is used to increase the flow rate output by the solenoid valve, compensating for the decrease in flow rate caused by the reduction in pressure difference, thereby making the air-fuel mixture flow rate in the engine intake tend to a stable value (e.g., Figure 10 As shown in the diagram (exhaust flow rate curve at a vehicle speed of 40 km / h), the oil and gas desorption process is proceeding stably.

[0055] By implementing the above two steps, the duty cycle of the solenoid valve control signal is matched with the signal feedback value of the differential pressure sensor.

[0056] Example 2:

[0057] 1. The high-pressure and low-pressure ports of the differential pressure sensor are arranged side-by-side with the valve inlet and outlet of the solenoid valve. That is, one end of the differential pressure sensor monitors the pressure at the inlet of the solenoid valve, and the other end monitors the pressure at the outlet of the solenoid valve. The advantage here is that the inlet and outlet of the solenoid valve and the two ports of the differential pressure sensor are located in the same area and are close to each other, allowing for real-time feedback of the differential pressure across the solenoid valve. Simultaneously, the opening and closing status of the solenoid valve can be determined based on the feedback value from the differential pressure sensor (e.g., ...). Figure 12As shown in the figure, this can be used to complete the fault check of the solenoid valve.

[0058] Example 3:

[0059] 1. The inlet and outlet of the solenoid valve are provided with accommodating spaces (e.g., Figure 7 As shown, the differential pressure sensor is located in the stagnant flow zone of the airflow field within the valve body of the solenoid valve, that is, inside the solenoid valve, far from the air inlet, far from the air outlet, and far from narrow flow areas, in a relatively stable pressure region. At the same time, the high-pressure port 21 and low-pressure port 22 of the differential pressure sensor are provided with axially protruding pipe differential pressure ports. The pipe wall of the pipe differential pressure port forms a baffle to avoid the direct impact of gas flow on the differential pressure sensor. The differential pressure sensor has a smaller sensing error caused by turbulent gas flow and can detect the true differential pressure value at both ends of the solenoid valve's air inlet and air outlet.

[0060] The design concept of this application is as follows: the high-pressure port and low-pressure port of the differential pressure sensor of the solenoid valve are connected in parallel with the corresponding port of the valve core; the flow rate and pressure of the gas output of the solenoid valve are controlled by the duty cycle of the PWM signal, and the duty cycle value is matched according to the feedback value of the differential pressure sensor. In addition, the opening and closing state of the solenoid valve can be determined according to the pressure signal change of the differential pressure sensor, thereby making the air-fuel ratio of the engine more stable.

[0061] Compared with the prior art, this application has the following beneficial effects:

[0062] 1. This application achieves the same effect as the original design while simplifying the configuration. The differential pressure sensor and the inlet and outlet of the solenoid valve are integrated into one piece, reducing the space for both to coexist. The product is smaller, lighter, and less expensive.

[0063] 2. This application simplifies the desorption process and improves the desorption efficiency of oil and gas from a design perspective;

[0064] 3. This application ensures that the intake air volume of the oil vapor mixture entering the engine tends to a steady-state value, thereby achieving precise adjustment of the output flow of the solenoid valve and making the air-fuel ratio of the engine more stable.

[0065] 4. This application improves the reliability of the oil and gas desorption valve and reduces oil and gas emissions;

[0066] 5. This application determines the working status of the solenoid valve by checking whether the signal of the differential pressure sensor changes, thereby realizing the fault detection of the solenoid valve.

[0067] The preferred embodiments of the invention are merely illustrative of the invention. They do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. These embodiments have been selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to make good use of the invention. The invention is limited only by the claims and their full scope and equivalents. The above disclosures are merely preferred embodiments of the invention, but are not intended to limit it. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit and essence of the invention should fall within the protection scope of the invention.

Claims

1. A solenoid valve with a differential pressure sensor for use in an oil and gas recovery system, characterized in that, The solenoid valve includes: a valve body, a differential pressure sensor, and a valve core; the differential pressure sensor and the valve core are disposed on the valve body; the valve body includes an upper valve cover, a middle partition, and a lower valve cover, the upper valve cover, the middle partition, and the lower valve cover dividing the interior of the valve body into an upper accommodating cavity and a lower accommodating cavity; the upper valve cover includes an air inlet connected to the upper accommodating cavity, and the lower valve cover includes an exhaust port connected to the lower accommodating cavity; The partition plate has a valve through hole, and the moving core assembly of the valve core is movably connected to the valve through hole; The partition plate also has a differential pressure through hole, and the partition plate has axially protruding differential pressure ports on both sides around the differential pressure through hole. One side of the differential pressure sensor is connected to the differential pressure through hole. The differential pressure port in the upper accommodating cavity is the high-pressure port of the differential pressure sensor and is connected to the inlet. The differential pressure port in the lower accommodating cavity is the low-pressure port of the differential pressure sensor and is connected to the exhaust port. The differential pressure sensor is used to monitor the pressure difference between the inlet and the exhaust port. The pipe wall of the differential pressure port forms a baffle to prevent the gas flow from directly impacting the differential pressure sensor, thereby enabling the detection of the true differential pressure value. The differential pressure sensor is disposed in the lower accommodating cavity, located in the quiescent region of the airflow field; The partition plate has axially protruding valve air passages on both sides of the valve through hole. The valve air passage has an opening on the side of the upper accommodating cavity as the valve inlet and an opening on the side of the lower accommodating cavity as the valve outlet. The high-pressure port of the differential pressure sensor is arranged side by side with the valve inlet, and the low-pressure port of the differential pressure sensor is arranged side by side with the valve outlet. The solenoid valve also includes a differential pressure sensor connector, which is electrically connected to the differential pressure sensor and is used to output information from the differential pressure sensor. The solenoid valve also includes a solenoid valve connector, which is electrically connected to the valve core and is used to receive PWM signals to control the output of fluid in the valve core. The solenoid valve is controlled by a PWM signal, and the duty cycle of the PWM signal can be adjusted according to the feedback value of the differential pressure sensor. At the same time, the working state of the solenoid valve can be confirmed according to the signal change value of the differential pressure sensor, so as to accurately control the output of fluid from the exhaust port of the solenoid valve.

2. The solenoid valve with differential pressure sensor according to claim 1, characterized in that, The valve core further includes: a spring, a coil assembly, and a sealing component; the coil assembly includes a coil, a coil frame, a stop, a cover plate, a valve seat, and a yoke that wraps the coil, and the stop is fixedly connected to a guide shaft; the coil assembly is covered with plastic, one end of the coil is inserted into the stop and cooperates with the cover plate, the other end of the coil cooperates with the valve seat, the valve seat is connected to the yoke, and the yoke completely wraps the coil, and the moving core assembly is slidably connected to the guide shaft.

3. The solenoid valve with differential pressure sensor according to claim 2, characterized in that, A one-way diaphragm is provided at the exhaust port of the solenoid valve.

4. The solenoid valve with differential pressure sensor according to claim 3, characterized in that, A filter screen is installed at the air inlet of the solenoid valve.

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