Pressure self-balancing vacuum proportional valve

Abstract

The application relates to a pressure self-balancing vacuum proportional valve, which comprises a first gas channel and a valve body, the first gas channel is provided with an air inlet cavity and an air outlet cavity; the valve body comprises a locking part and a driving part, the locking part is arranged between the air inlet cavity and the air outlet cavity, the locking part can move up and down when being driven by the driving part, the locking part can open and close a communication port of the air inlet cavity and the air outlet cavity, when the communication port of the air inlet cavity and the air outlet cavity is opened, gas can be sucked out from the air inlet cavity into the air outlet cavity. The driving part comprises a first pressure cavity and a second pressure cavity, the second pressure cavity is communicated with the air inlet cavity through an independently arranged second gas channel, when the suction degree of a negative pressure source is reduced, the negative pressure of the air outlet cavity and the air inlet cavity is reduced, the pressure is increased, at this moment, the pressure of the second pressure cavity communicated with the air inlet cavity is increased, the locking part is moved downwards, the communication port of the air inlet cavity and the air outlet cavity is opened larger, more gas flows from the air inlet cavity to the air outlet cavity and is discharged, and the negative pressure in the first gas channel is increased.

Description

Technical Field

[0001] This application relates to the field of proportional valve technology, and in particular to a pressure self-balancing vacuum proportional valve. Background Technology

[0002] With the development of proportional valve technology, the market demand for proportional valves with better performance continues to grow, and the market demand for proportional valves with high control accuracy and strong stability is becoming increasingly strong.

[0003] Traditional proportional valves are generally manually controlled. In an ideal situation, a manually controlled proportional valve can maintain a constant negative pressure and the overall performance of the proportional valve remains stable. However, in reality, the machines that provide positive and negative pressure are usually connected to multiple devices, and the negative and positive pressure sources of the proportional valve are prone to fluctuations, making it impossible to maintain a constant and precise pressure at all times. Summary of the Invention

[0004] Therefore, it is necessary to provide a pressure self-balancing vacuum proportional valve to address the problems of low control accuracy and unstable performance of proportional valves.

[0005] The pressure self-balancing vacuum proportional valve provided in this application adopts the following technical solution: A pressure self-balancing vacuum proportional valve includes a first gas passage and a valve body. The first gas passage has an inlet chamber and an outlet chamber. The valve body includes a locking member and a driving member. The locking member is disposed between the inlet chamber and the outlet chamber to isolate the inlet chamber from the outlet chamber. The driving member includes a first pressure chamber and a second pressure chamber communicating with the inlet chamber. The first pressure chamber is directly connected to an external positive pressure source. The second pressure chamber is connected to the inlet chamber through an independently provided second gas passage. The driving member is driven by the locking member and is configured to be driven by the pressure in the first pressure chamber and the second pressure chamber, forcing the locking member to move accordingly to connect the inlet chamber and the outlet chamber.

[0006] By adopting the above technical solution, when the first pressure chamber is connected to a positive pressure source, the pressure inside the first pressure chamber increases, causing the locking member to move downward and open the connection between the inlet and outlet chambers. When the outlet chamber is connected to a negative pressure source, gas will enter the outlet chamber from the inlet chamber and be discharged, thus achieving the pressure reduction function. Since the negative pressure source connected to the outlet chamber is prone to fluctuations, the suction force of the negative pressure source decreases, and the negative pressure decreases, causing the pressure inside the outlet and inlet chambers to increase, leading to unstable pressure reduction performance of the proportional valve. However, this application adds a second gas channel to achieve mutual communication between the second pressure chamber and the inlet chamber. When the pressure inside the inlet chamber increases, the pressure in the connected second pressure chamber also increases, pushing the locking member downward, thereby opening the connection between the inlet and outlet chambers wider. More gas enters the outlet chamber from the inlet chamber through the connection and is discharged, increasing the negative pressure and decreasing the overall pressure in the inlet, outlet, and second pressure chambers. The pressure state in the above cavity occurs instantaneously. This application adds a second gas channel to connect the intake cavity and the second pressure cavity, so that the negative pressure in the first gas channel remains stable, thereby making the proportional valve more stable.

[0007] In one embodiment of this application, the valve body has an atmospheric pressure chamber disposed below the second pressure chamber, and the atmospheric pressure chamber is connected to the external atmospheric pressure through an atmospheric through-hole.

[0008] By adopting the above technical solution, when the negative pressure source is working normally without fluctuations, the second pressure chamber and the atmospheric pressure chamber remain in balance. When the pressure in the second pressure chamber increases, the locking element moves towards the atmospheric pressure chamber due to the pressure.

[0009] In one embodiment of this application, the locking member further includes a diaphragm assembly made of an elastic material.

[0010] By adopting the above technical solution, the diaphragm assembly is placed between the second pressure chamber and the atmospheric pressure chamber, separating the second pressure chamber and the atmospheric pressure chamber into two non-connected chambers. When the negative pressure source's suction force is insufficient, the negative pressure in the second pressure chamber decreases and the pressure increases, causing the diaphragm assembly, which is in its original shape, to be pressed downwards and deformed, while simultaneously driving the locking element to move downwards; or when the positive pressure source outputs less gas and the pressure in the first pressure chamber decreases, the diaphragm assembly is pressed upwards and deformed.

[0011] In one embodiment of this application, the driving member includes a baffle plate disposed between the first pressure chamber and the second pressure chamber, the baffle plate abutting against the locking member, and the baffle plate being configured to move up and down under the action of the first pressure chamber.

[0012] By adopting the above technical solution, the baffle plate can separate the first pressure chamber and the second pressure chamber into two independent, non-connected cavities. The baffle plate abuts against the locking member, and when the baffle structure moves, it will drive the locking member to move. When the pressure in the first pressure chamber increases, the baffle plate moves downward, simultaneously driving the locking member downward, opening the connection between the inlet and outlet chambers, thereby achieving mutual communication between the inlet and outlet chambers. The negative pressure source can then smoothly draw in air, keeping the first gas passage in a negative pressure state.

[0013] In one embodiment of this application, the locking member further includes a spindle, a first spring, and a steel ball. The spindle has a hollow structure and a first spring is disposed inside. One end of the first spring is connected to the spindle, and the other end abuts against the steel ball, which abuts against the spindle.

[0014] By adopting the above technical solution, a first spring is set inside the mandrel to abut against the steel ball. The first spring is in a compressed state and has elastic potential energy. When the gas input from the positive pressure source decreases and the gas pressure is insufficient, the pressure in the first pressure chamber decreases, the diaphragm assembly is deformed upward, and the mandrel and the first spring move upward. At this time, the length of the first spring increases, the elastic potential energy decreases, the mandrel separates from the steel ball, and the gas in the atmospheric pressure chamber can enter the interior of the mandrel.

[0015] In one embodiment of this application, the locking member further includes a through hole, which is disposed on the mandrel.

[0016] By adopting the above technical solution, the interior of the mandrel can communicate with the second pressure chamber. When the diaphragm assembly is deformed upwards, the mandrel separates from the steel ball, allowing gas to enter the interior of the mandrel from the atmospheric pressure chamber, and then pass through the through-hole into the second pressure chamber. This increases the pressure in the second pressure chamber, restoring the pressure balance between the upper and lower chambers. The diaphragm assembly returns to its original shape, the first spring is compressed, storing elastic potential energy, and the mandrel and steel ball re-engage, sealing the connection between the second pressure chamber and the atmospheric pressure chamber. Adding the through-hole allows for timely adjustment of the pressure in the upper and lower chambers when the positive pressure source fluctuates, maintaining internal balance and making the proportional valve more stable during operation.

[0017] In one embodiment of this application, the locking member further includes a fixed shaft, the spindle is configured as a hollow structure, and the spindle, the first spring and the steel ball are all disposed inside the fixed shaft.

[0018] By adopting the above technical solution, the spindle, the first spring, and the steel ball are confined inside the fixed shaft. When the pressure inside the cavity changes, the spindle, the first spring, and the steel ball are in a contact state. When the diaphragm assembly is subjected to vertical pressure, it will drive the fixed shaft to move up and down, thereby driving the spindle, the first spring, and the steel ball to move up and down. When the spindle, the first spring, and the steel ball move up or down, displacement may easily occur. Adding a fixed shaft to fix the spindle, the first spring, and the steel ball inside the fixed shaft further stabilizes the overall structure of the spindle, the first spring, and the steel ball, ensuring that the proportional valve can work normally.

[0019] In one embodiment of this application, a baffle is provided inside the valve body, and the baffle abuts against the locking member to separate the air inlet chamber and the air outlet chamber.

[0020] By adopting the above technical solution, the baffle and the locking part abut against and seal the connection between the air inlet and the air outlet, so that the gas in the air inlet and the air outlet do not flow. When the locking part moves downward, the gap between the connection between the air inlet and the air outlet becomes larger, and more gas flows between the air inlet and the air outlet.

[0021] In one embodiment of this application, the locking member further includes a piston, which abuts against the baffle.

[0022] By adopting the above technical solution, when the baffle and the piston abut, the connection between the air inlet chamber and the air outlet chamber is closed. At this time, no negative pressure is generated in the air inlet chamber. If the air inlet chamber is to obtain negative pressure or obtain a greater negative pressure, the air inlet chamber and the air outlet chamber need to be connected, or the piston needs to move downward. The gap between the air inlet chamber and the air outlet chamber needs to be larger, which requires the piston to move downward by a larger amount.

[0023] In one embodiment of this application, the locking member further includes a push rod, one end of which is fixedly connected to the piston, and the other end of which abuts against the steel ball.

[0024] By adopting the above technical solution, when the push rod is subjected to a downward force and moves downward, it drives the piston to move downward, and the gap between the air inlet and outlet chambers becomes larger.

[0025] In summary, the technical solution provided in this application has at least one of the following technical effects: 1. By setting a second gas channel on the valve body to connect the second pressure chamber and the outlet chamber, when the negative pressure source fluctuates, the suction force of the negative pressure source decreases, the negative pressure in the outlet chamber and the inlet chamber decreases, and the pressure increases. As a result, the pressure in the second pressure chamber connected to the inlet chamber also increases. The diaphragm assembly is deformed downward, which drives the locking element to move downward, making the connection between the inlet chamber and the outlet chamber larger. More gas in the inlet chamber is drawn into the outlet chamber, the negative pressure in the first gas channel increases, the pressure decreases, and the pressure in each chamber returns to a balanced state, so that the proportional valve has stable pressure reduction performance when it is working.

[0026] 2. By setting a through hole in the mandrel and a steel ball at the connection between the mandrel and the push rod, when the positive pressure source fluctuates, the input air pressure of the positive pressure source decreases, the pressure in the first pressure chamber decreases, the diaphragm assembly is deformed upward, driving the mandrel to move upward, the mandrel separates from the steel ball, and the gas in the atmospheric pressure chamber enters the mandrel through the separation port between the mandrel and the steel ball, and then enters the second pressure chamber through the through hole. The pressure in the second pressure chamber increases, the pressure in the upper and lower chambers returns to a balanced state, the diaphragm assembly resets, the mandrel and the steel ball re-abut, sealing the connection between the second pressure chamber and the atmospheric pressure chamber, ensuring the stability of the proportional valve's working performance and more precise control.

[0027] 3. By confining the spindle, the first spring, and the steel ball inside the fixed shaft, the positions of the spindle, the first spring, and the steel ball are further stabilized, preventing them from shifting and ensuring that the internal structure of the proportional valve remains stable so that it can work normally. Attached Figure Description

[0028] Figure 1 This is a first cross-sectional view of the pressure self-balancing vacuum proportional valve of this application; Figure 2 This is a second cross-sectional view of the pressure self-balancing vacuum proportional valve of this application; Figure 3 The diagram shows the structure of some embodiments of this application.

[0029] Explanation of reference numerals in the attached figures: 10. First gas passage; 20. Valve body; 30. Second gas passage; 40. Baffle; 50. Sealing cover; 60. Stop nut; 11. Inlet chamber; 12. Outlet chamber; 21. Locking element; 22. Driving element; 23. Atmospheric pressure chamber; 24. Atmospheric vent; 211. Diaphragm assembly; 212. Spindle; 213. First spring; 214. Steel ball; 215. Fixed shaft; 216. Through hole; 217. Push rod; 218. Piston; 219. Second spring; 221. First pressure chamber; 222. Second pressure chamber; 223. Baffle plate; 61. Adjusting screw; 62. Fixed nut; 63. Third spring; 64. Spring pressure plate. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] See Figure 1 and Figure 2 , Figure 1 This is a first cross-sectional view of the pressure self-balancing vacuum proportional valve of this application. Figure 2 This is a second cross-sectional view of the pressure self-balancing vacuum proportional valve of this application. An embodiment of this application provides a pressure self-balancing vacuum proportional valve, including a first gas passage 10 and a valve body 20. The first gas passage 10 has an inlet chamber 11 and an outlet chamber 12. The valve body 20 includes a locking member 21 and a driving member 22. The locking member 21 is disposed between the inlet chamber 11 and the outlet chamber 12. When driven by the driving member 22, the locking member 21 can move up and down, thereby opening and closing the communication port between the inlet chamber 11 and the outlet chamber 12. When the communication port between the inlet chamber 11 and the outlet chamber 12 is open, gas can enter from the inlet chamber 11 and be extracted from the outlet chamber 12. The driving component 22 includes a first pressure chamber 221 and a second pressure chamber 222. The second pressure chamber 222 is connected to the air inlet chamber 11 through an independently provided second gas channel 30. When the suction force of the negative pressure source decreases, the negative pressure of the air outlet chamber 12 decreases and the pressure increases. At this time, the pressure of the second pressure chamber 222 connected to the air inlet chamber 11 increases, causing the locking component 21 to move downward, opening the connection between the air inlet chamber 11 and the air outlet chamber 12 wider, and more gas flows from the air inlet chamber 11 to the air outlet chamber 12 and is discharged.

[0032] The first gas passage 10 has an inlet chamber 11 and an outlet chamber 12. Specifically, the inlet chamber 11 and the outlet chamber 12 are connected by a connecting port, the opening and closing of which is controlled by a locking element 21. The inlet chamber 11 is connected to the device that needs to reduce pressure, and the outlet chamber 12 is connected to a negative pressure source. The negative pressure source draws gas from the outlet chamber 12, and the gas from the device that needs to reduce pressure enters the inlet chamber 11 and is then drawn into the outlet chamber 12 and discharged, thus achieving the function of reducing pressure.

[0033] The valve body 20 includes a locking element 21 and a driving element 22. Specifically, the locking element 21 is disposed between the air inlet chamber 11 and the air outlet chamber 12, and is used to control the opening and closing of the connection between the air inlet chamber 11 and the air outlet chamber 12. The locking element 21 passes through the first pressure chamber 221, the second pressure chamber 222, and the first gas passage 10. When the locking element 21 moves downward, the connection between the air inlet chamber 11 and the air outlet chamber 12 opens. The longer the locking element 21 moves downward, the larger the connection opens, and the more gas flows. When the locking element 21 moves upward, the degree of opening of the connection gradually decreases, and the gas flow decreases. When the locking element 21 moves upward to its final position, the connection is completely closed, and the gas in the air inlet chamber 11 and the air outlet chamber 12 does not flow.

[0034] The driving component 22 includes a first pressure chamber 221 and a second pressure chamber 222. The first pressure chamber 221 is located above the second pressure chamber 222 and is directly connected to an external positive pressure source, so that the first pressure chamber 221 is in a positive pressure state when the proportional valve is working. The second pressure chamber 222 is connected to the intake chamber 11 through an independently provided second gas channel 30, and the exhaust chamber 12 is directly connected to an external negative pressure source. When the proportional valve is working, the exhaust chamber 12 and the intake chamber 11 are in a negative pressure state, and the second pressure chamber 222 is also in a negative pressure state. The first pressure chamber 221 and the second pressure chamber 222 allow the locking component 21 to move up and down to connect the intake chamber 11 and the exhaust chamber 12.

[0035] The driving component 22 also includes a baffle plate 223. Specifically, the baffle plate 223 is disposed between the first pressure chamber 221 and the second pressure chamber 222. The baffle plate 223 separates the first pressure chamber 221 and the second pressure chamber 222 into two non-communicating chambers. The lower side of the baffle plate 223 abuts against the locking component 21. The baffle plate 223 can move up and down in the first pressure chamber 221 and the second pressure chamber 222. When gas is input from the positive pressure source connected to the first pressure chamber 221, the pressure in the first pressure chamber 221 increases, causing the baffle plate 223 to move downward, which in turn drives the locking component 21 to move downward.

[0036] In a specific embodiment, the barrier plate 223 is configured as a hollow columnar body. The columnar barrier plate 223 can move up and down in the first pressure chamber 221 and the second pressure chamber 222. The bottom end of the columnar structure of the barrier plate 223 abuts against the locking member.

[0037] The valve body 20 has an atmospheric pressure chamber 23 located below the second pressure chamber 222. Specifically, the atmospheric pressure chamber 23 is connected to the external atmospheric pressure through an atmospheric through-hole 24. When the proportional valve is working, the first pressure chamber 221 is in a positive pressure state, and the second pressure chamber 222 is in a negative pressure state. The negative pressure source is prone to fluctuations, which leads to a decrease in the negative pressure of the outlet chamber 12 and the inlet chamber 11. The decrease in the negative pressure of the second pressure chamber 222, which is connected to the inlet chamber 11 through the second gas channel 30, causes the locking member 21 to move downward. As the locking member 21 moves downward, the connection between the inlet chamber 11 and the outlet chamber 12 opens wider and wider, and more gas flows from the inlet chamber 11 to the outlet chamber 12. The negative pressure in the outlet chamber 12 increases, making the negative pressure of the first gas channel 10 constant, ensuring that the proportional valve maintains stable pressure reduction performance during operation and that the pressure reduction control is more precise.

[0038] The diaphragm assembly 211, disposed between the atmospheric pressure chamber 23 and the second pressure chamber 222, can separate the atmospheric pressure chamber 23 and the second pressure chamber 222 into two non-communicating chambers. Specifically, the diaphragm assembly 211 can also elastically deform, and when the internal pressure of the chamber changes, the diaphragm assembly 211 is pressed upward or downward.

[0039] Specifically, in this embodiment, the diaphragm assembly 211 includes a diaphragm and a diaphragm fixing plate. The diaphragm, disposed on the valve body 20, separates the atmospheric pressure chamber 23 from the second pressure chamber 222. The diaphragm is made of rubber and is capable of elastic deformation. The area of ​​the diaphragm fixing plate is smaller than that of the diaphragm and is disposed on the upper side of the diaphragm. The barrier plate 223 directly abuts against the diaphragm fixing plate. The diaphragm fixing plate can both fix the diaphragm and abut against the barrier plate 223 to allow the barrier plate 223 to move downward, thereby driving the locking member 21 to move downward.

[0040] See Figure 3 , Figure 3 The diagram shows the structure of some embodiments of this application. The locking component also includes a spindle 212, a first spring 213, and a steel ball 214. Specifically, the spindle 212 is hollow, and the first spring 213 is inserted inside the spindle 212. The steel ball 214 is positioned between the spindle 212 and the push rod 217, abutting against both the spindle 212 and the push rod 217. The steel ball 214 also abuts against the first spring 213 inside the spindle 212. The first spring 213 is in a compressed state, storing elastic potential energy. The structure and working principle of the push rod 217 will be described in detail below.

[0041] The locking mechanism also includes a fixed shaft 215. Specifically, the fixed shaft 215 penetrates the diaphragm assembly 211. The fixed shaft 215 is configured as a hollow structure, with the spindle 212, the first spring 213, and the steel ball 214 all disposed inside the fixed shaft 215. The spindle 212 is fixedly positioned inside the fixed shaft 215, and the first spring 213 and the steel ball 214 can move up and down inside the fixed shaft 215 to prevent the spindle 212, the first spring 213, and the steel ball 214 from being unstable during movement, which could lead to structural damage.

[0042] In a specific embodiment, the fixed shaft 215 and the spindle 212 are shaped such that the spindle 212 can be engaged with the fixed shaft 215, ensuring that the fixed shaft 215 can drive the spindle 212 to move up and down when it moves up and down. A bearing plate extends from the lower periphery of the fixed shaft 215 to support the diaphragm. The upper side of the bearing plate abuts against the diaphragm fixing plate located on the lower side of the diaphragm. When the pressure inside the cavity changes, the diaphragm is subjected to upward or downward pressure, and the diaphragm elastically deforms upward or downward, driving the fixed shaft 215 to move down or up.

[0043] The mandrel 212 is provided with a through hole 216, which allows the interior of the mandrel 212 to communicate with the second pressure chamber 222. When the pressure in each chamber is balanced, the steel ball 214 abuts against the mandrel 212, and the first spring 213 is compressed inside the mandrel 212, storing elastic potential energy. When the positive pressure source is unstable and the output gas decreases, the pressure in the first pressure chamber 221 decreases, thus the diaphragm is pressed upward, causing the fixing plate to move upward, which in turn causes the mandrel 212 to move upward. As the cylinder moves upward, the second spring 219 extends, releasing elastic potential energy. The steel ball 214 separates from the spindle 212, and the gas in the atmospheric pressure chamber 23 enters the spindle 212, passes through the through hole 216, and enters the second pressure chamber 222. The diaphragm resets, causing the fixing plate to move downward, which in turn causes the spindle 212 to move downward. The second spring 219 is compressed, storing elastic potential energy. The steel ball 214 and the spindle 212 re-engage, and the second pressure chamber 222 and the atmospheric pressure chamber 23 return to a state of non-connection.

[0044] The locking component 21 also includes a push rod 217, a piston 218, and a second spring 219. Specifically, the upper end of the push rod 217 abuts against the steel ball 214, the lower end of the push rod 217 is fixedly connected to the piston 218, and the second spring 219 is disposed around the piston 218. When the push rod 217 moves downward, it drives the piston 218 to move downward, which in turn drives the second spring 219 to press downward.

[0045] A baffle 40 is provided inside the valve body 20. Specifically, when the baffle 40 abuts against the piston 218, the connection between the air inlet chamber 11 and the air outlet chamber 12 is closed. At this time, the second spring 219 is at its maximum extension and its elastic potential energy is at its minimum. At this time, the air inlet chamber 11 does not generate negative pressure. If the air inlet chamber 11 is to obtain negative pressure or a greater negative pressure, the air inlet chamber 11 and the air outlet chamber 12 need to be connected or the piston 218 needs to move downward to make the gap between the air inlet chamber 11 and the air outlet chamber 12 larger. Therefore, the piston 218 needs to be displaced downward by a greater amount. At this time, the second spring 219 is compressed and stores elastic potential energy.

[0046] A sealing cover 50 is provided on the lower side of the piston 218. Specifically, the sealing cover 50 is fixedly provided at the bottom end of the valve body 20. The sealing cover 50 is configured to abut against the shape of the opening at the bottom end of the valve body 20 and seal. The sealing cover 50 is configured to allow the piston 218 to be snapped onto the sealing cover 50.

[0047] Please continue reading Figure 1The valve body 20 is also provided with a stop nut 60, including an adjusting screw 61, a fixing nut 62, a third spring 63, and a spring pressure plate. Specifically, the adjusting screw 61 is disposed on the stop nut 60 and passes through the stop nut 60. A portion of the adjusting screw 61 protruding from the upper side of the stop nut 60 is fixed to the stop nut 60 by the fixing nut 62, enhancing its overall stability. A portion protruding from the lower side of the stop nut 60 is located within the first pressure chamber 221 and abuts against the spring pressure plate disposed within the first pressure chamber 221. The spring pressure plate is disposed between the third spring 63 and the adjusting screw 61. One end of the third spring 63 abuts against the barrier plate 223, and the other end abuts against the spring pressure plate. When adjusting the stop nut 60, the adjusting screw 61 moves downward against the spring pressure plate. At this time, the third spring 63 is compressed, and the blocking structure moves downward. The device proposed in this application is a pneumatic vacuum proportional valve. The addition of the stop nut 60 can realize manual control of the pressure state inside the proportional valve.

[0048] In a specific embodiment, the spring plate has a recess in the middle, and the adjusting screw 61 abuts against the recess of the spring plate to prevent the adjusting screw 61 from easily becoming misaligned when it moves downward.

[0049] The operating principle of the pressure self-balancing vacuum proportional valve provided in this application is as follows: Gas is input from a positive pressure source, causing the baffle plate 223 to drive the diaphragm assembly 211, which in turn deforms elastically. This causes the fixed shaft 215 to move downwards, which in turn drives the push rod 217 downwards. This causes the piston 218, which is fixedly connected to the push rod 217, to move downwards. At this time, the connection between the inlet chamber 11 and the outlet chamber 12 opens, allowing gas in the inlet chamber 11 to enter the outlet chamber 12 and be discharged. The outlet chamber 12 is connected to the second pressure chamber 222 via a second gas channel 30 independently located within the chamber. When the negative pressure in the negative pressure chamber decreases and the pressure increases, simultaneously, the negative pressure in the second pressure chamber 222 decreases and the pressure increases. The diaphragm is pressed downwards, causing the piston 218 to move downwards. The connection between the inlet chamber 11 and the outlet chamber 12 opens wider, allowing more gas to be drawn from the inlet chamber 11 to the outlet chamber 12 and discharged. This increases the negative pressure, making the proportional valve's control of the pressure reduction value more precise and its pressure reduction performance more stable.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pressure self-balancing vacuum proportional valve, characterized in that, include: The first gas passage (10) has an inlet chamber (11) and an outlet chamber (12) for connecting to a negative pressure source. The valve body (20) includes a locking member (21) and a driving member (22). The locking member (21) is disposed between the air inlet chamber (11) and the air outlet chamber (12) to isolate the air inlet chamber (11) from the air outlet chamber (12). The driving member (22) includes a first pressure chamber (221) and a second pressure chamber (222) connected to the air intake chamber (11). The first pressure chamber (221) is directly connected to a positive pressure source. The second pressure chamber (222) is connected to the air intake chamber (11) through an independently provided second gas channel (30). The driving member (22) is connected to the locking member (21). The driving member (22) is configured to be driven by the pressure in the first pressure chamber (221) and the second pressure chamber (222), forcing the locking member (21) to move accordingly to connect the air intake chamber (11) and the air outlet chamber (12). The valve body (20) has an atmospheric pressure chamber (23) located below the second pressure chamber (222), and the atmospheric pressure chamber (23) is connected to the external atmospheric pressure through an atmospheric passage (24); The locking member (21) further includes a diaphragm assembly (211) disposed between the atmospheric pressure chamber (23) and the second pressure chamber (222), the diaphragm assembly (211) being made of an elastic material; The driving component (22) includes a baffle plate (223), which is disposed between the first pressure chamber (221) and the second pressure chamber (222). The baffle plate (223) is configured to move up and down under the action of the first pressure chamber (221) and separate the first pressure chamber (221) and the second pressure chamber (222) into two non-communicating cavities. The baffle plate (223) is configured as a hollow columnar body, and the bottom end of the columnar structure of the baffle plate (223) abuts against the locking component (21). The locking component (21) further includes a spindle (212), a first spring (213), and a steel ball (214). The spindle (212) is a hollow structure with the first spring (213) inside. One end of the first spring (213) is connected to the spindle (212), and the other end abuts against the steel ball (214). The steel ball (214) abuts against the spindle (212). The locking member (21) further includes a through hole (216), which is disposed on the spindle (212); The locking component (21) also includes a fixed shaft (215), the spindle (212) is configured as a hollow structure, and the spindle (212), the first spring (213) and the steel ball (214) are all disposed inside the fixed shaft (215).

2. The pressure self-balancing vacuum proportional valve according to claim 1, characterized in that, The valve body (20) is provided with a baffle (40) inside, which abuts against the locking member (21) to separate the air inlet chamber (11) and the air outlet chamber (12).

3. The pressure self-balancing vacuum proportional valve according to claim 2, characterized in that, The locking member (21) also includes a piston (218) that abuts against the baffle (40).

4. The pressure self-balancing vacuum proportional valve according to claim 3, characterized in that, The locking member (21) also includes a push rod (217), one end of which is fixedly connected to the piston (218), and the other end abuts against the steel ball (214).

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