Pneumatic diaphragm valve capable of controlling flow and using method thereof

Abstract

The invention discloses a pneumatic diaphragm valve capable of controlling flow and a using method thereof, and belongs to the technical field of valves. The device comprises a valve body; the driving mechanism comprises a valve cover, an air cavity piece, a piston piece and a connecting piece; the adjusting mechanism comprises a spinning part and a pawl assembly; the diaphragm is arranged at the valve port and is connected with the driving mechanism through a connecting piece; and a sealing sheet. According to the pneumatic diaphragm valve capable of controlling the flow, a user can finely adjust the flow through the adjusting mechanism, the user can adjust the fitting degree of the diaphragm and the valve port by rotating the spinning part to adjust the internal air pressure, and therefore the flow speed of fluid is changed; the using method comprises the steps of sealing performance testing, zero setting testing, data statistics, function fitting and finally putting into use, the flexibility and efficiency of a production line can be remarkably improved through the high-efficiency flow adjusting capacity, and the rapidly-changing production requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a pneumatic diaphragm valve capable of controlling flow and a use method thereof. Background Art

[0002] As an important fluid control device, diaphragm valves are widely used in many industries such as medical, food, and chemical industries. They are favored for their good sealing and corrosion resistance. In these industries, fluid control often involves hygiene standards and safety requirements. Pneumatic diaphragm valves can effectively prevent pollution and ensure the purity of fluids with their design without dead corners and liquid accumulation. However, existing pneumatic diaphragm valves are mainly used for fluid opening and closing control in practical applications, lacking precise flow regulation functions. Most traditional pneumatic diaphragm valves can only achieve "full open" or "full closed" states, and cannot meet the detailed requirements for flow regulation. This limitation may lead to uneven drug delivery in the medical industry, and may affect the stability of the production process and product quality in the food industry. It cannot adapt to the intelligent and automated requirements of fluid control in modern production processes, which requires operators to frequently make manual adjustments during flow control, increasing the complexity of operation and potential safety hazards.

[0003] Therefore, developing a pneumatic diaphragm valve with flow control function, which can achieve precise flow regulation in addition to opening and closing, will greatly improve the fluid control capabilities of medical and food industries and meet high standards of safety and quality requirements. The present invention aims to fill this technical gap and provide a more flexible and efficient fluid control solution for various industries. To this end, we propose a pneumatic diaphragm valve that can control flow and a method of using it. Summary of the invention

[0004] The object of the present invention is to provide a pneumatic diaphragm valve capable of controlling flow and a method of using the same, so as to solve the problem that the existing pneumatic diaphragm valve is mainly used for opening and closing control of fluid in practical applications and lacks precise flow regulation function.

[0005] In order to solve the above technical problems, the present invention provides a pneumatic diaphragm valve capable of controlling flow and a method of using the same, comprising: a valve body, the valve body comprising a liquid inlet cavity, a valve cavity, a valve port, a valve seat, and a liquid outlet cavity on the other side opposite to the liquid inlet cavity; A driving mechanism, the driving mechanism is arranged above the valve body, and comprises a valve cover, an air cavity member arranged above the valve cover, a piston member arranged in the air cavity member, and a connecting member arranged below the piston member; An adjusting mechanism, the adjusting mechanism comprising a spinning part and a pawl assembly arranged on one side of the spinning part; The diaphragm is placed at the valve port and connected to the driving mechanism through a connecting piece, and is the main mechanism for the pneumatic diaphragm valve to achieve sealing; A sealing sheet, wherein the sealing sheet is arranged between the valve cover and the valve body; The air cavity component includes a limit block arranged at the bottom thereof, an air inlet hole opened on one side of the air cavity component and passing through, a ratchet wheel fixedly connected to the top of the air cavity component, a first connecting thread arranged below the ratchet wheel, and a plurality of axial scale lines opened below the first connecting thread; The spin-formed part is cylindrical, buckled over the air cavity part, and threadedly connected to the air cavity part via a second connecting thread. It also includes a plurality of radial scale lines arranged on its outer wall, a ratchet cavity opened on its inner wall, and a connecting rod arranged inside it.

[0006] Preferably, a flow meter is provided in the liquid outlet cavity for monitoring the liquid outlet flow rate of the diaphragm valve.

[0007] Preferably, a valve cover cavity is provided in the valve cover, and the valve cover cavity cooperates with the limit block.

[0008] Preferably, the piston member includes a piston rod and a buffer block arranged on the other side of the piston rod; A piston cavity is provided in the buffer block.

[0009] Preferably, one end of the connecting piece is a piston, and the other end is inserted into the diaphragm and fits the shape of the inner wall of the diaphragm. The degree to which the diaphragm fits the valve port can be controlled by lifting and lowering the connecting piece.

[0010] Preferably, the pawl assembly comprises a pawl, a pull rod disposed on one side of the pawl, a return spring disposed on the outer ring of the pull rod, and a control button disposed on the other end of the pull rod, and the control button is disposed on the outer wall of the spinning part; The pawl cooperates with the ratchet wheel.

[0011] Preferably, the diaphragm comprises a connecting cavity, a sealing membrane arranged at one side of the connecting cavity, a positioning ring arranged at the periphery of the sealing membrane, and an elastic contact area arranged at the bottom of the connecting cavity.

[0012] Preferably, the top of the valve port has an uneven uniform wavy structure, and the size of the inlet of the valve port can be adjusted by adjusting the degree to which the diaphragm fits the valve port, thereby achieving flow regulation.

[0013] Preferably, the valve body, the sealing sheet and the valve cover are fixedly connected by a plurality of screws around them; A pressure relief hole is provided at the joint between the valve cover and the sealing sheet.

[0014] The present invention also provides a method for using a pneumatic diaphragm valve capable of controlling flow, comprising the following steps: Step A: Sealing test; Step A1: first pull out the control button in the pawl assembly to disengage the pawl from the ratchet wheel. After disengagement, screw the rotary pressing member to the "zero scale" position, that is, when the first connecting thread is engaged with the second connecting thread, screw the rotary pressing member to align the zero scale position of the axial scale line with the zero scale position of the radial scale line, and the zero scale position of the axial scale line is at the lowest position; Step A2: After completing step A1, insert the control button so that the end of the pawl is inserted into the tooth groove of the ratchet. At this time, the spinning part can only rotate in the downward rotation direction. When rotating in the upward rotation direction, it will be limited by the pawl and cannot rotate; Step A3: The fluid is input into the valve cavity through the liquid inlet cavity at a certain rate and flows out from the liquid outlet cavity. Since it is at the zero scale position at this time, the liquid flow rate of the liquid outlet cavity will not be too much. At the same time, the air inlet valve is opened, and air is continuously supplied to the air cavity through the air inlet hole. While supplying air, the flow meter reading in the liquid outlet cavity is observed until the flow meter shows that the flow rate drops to zero, and the air supply is stopped. The liquid inlet cavity maintains the liquid inlet rate; Step A4: Close the air inlet valve and maintain the liquid inlet state for 10 to 20 minutes. After confirming that there is no more fluid flowing out of the liquid outlet cavity, stop the test and the device sealing test is completed. Step B: Zero adjustment test; Step B1: Immediately following step A4, the sealing test is completed and zeroing is started. The sealing test state is maintained, and the pressure is gradually released through the pressure relief valve on the pressure relief hole. Specifically, the pressure relief is stopped after 1 second, and the flow meter reading is left to stand for half a minute to observe whether there is any fluctuation. If there is no change, the pressure relief cycle is continued until the flow meter has a slight reading, and the cycle is stopped. The zeroing is completed; Step C: test and collect flow rate data; Step C1: Rotate the spinning part one circle to make the axial scale line move up one grid, let it stand for half a minute, and record the flow rate of the flow meter; record the liquid flow rate corresponding to each scale and count them; Step C2: draw a graph, fit the function, and obtain the fitting function equation; Step C3: Substitute data for verification; Step D: Use of diaphragm valve; Step D1: Find the corresponding scale by fitting the function equation according to the required liquid flow rate; Step D2: Adjust the spinning part to find the corresponding scale, maintain the fluid inlet rate and start using; Step D3: During use, the position of the spinning part can be adjusted at any time to change the scale to adjust the liquid outlet rate to control the flow rate, and finally verified again by the flow meter.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The pneumatic diaphragm valve capable of controlling flow rate of the present invention enables the user to finely adjust the flow rate through the spinning part and the ratchet assembly in the regulating mechanism. The user can adjust the internal air pressure by rotating the spinning part to adjust the fit between the diaphragm and the valve port, thereby changing the flow rate of the fluid. This design makes the flow rate regulation more flexible and adapts to the flow rate requirements under different working conditions, especially in applications where the flow rate needs to be precisely controlled (such as chemical, pharmaceutical, food, etc.), which can effectively improve production efficiency and product quality; 2. The method for using a pneumatic diaphragm valve that can control flow rate of the present invention includes a sealing test, a zeroing test, data statistics, and a fitting function before finally being put into use. This structured process makes the operation more systematic, the reliability of the equipment is enhanced through the sealing test, the accuracy of the operation is improved through the zeroing test, the corresponding scale is found using the fitting function equation, and the real-time monitoring of the flow rate by a flow meter is used to improve the response speed of the system. The user can quickly adjust the flow rate according to demand during operation, avoiding the response lag problem in the traditional valve adjustment process. This high-efficiency flow adjustment capability can significantly improve the flexibility and efficiency of the production line and meet rapidly changing production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 2 It is an overall exploded view of a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 3 It is a front cross-sectional view of a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 4 It is a right side cross-sectional view of a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 5 It is a structural schematic diagram of an air cavity component in a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 6 It is a structural schematic diagram of a spinning component in a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 7 It is a top cross-sectional view of a pneumatic diaphragm valve capable of controlling flow provided by the present invention; Figure 8 The invention provides a flow control device for a diaphragm in a pneumatic diaphragm valve capable of controlling flow; Fig. 9 It is a fitting function curve of a method for using a pneumatic diaphragm valve capable of controlling flow provided by the present invention; In the figure: 1, valve body; 101, liquid inlet cavity; 102, valve cavity; 103, valve port; 104, valve seat; 105, liquid outlet cavity; 106, flow meter; 2, driving mechanism; 201, valve cover; 201a, valve cover cavity; 201b, pressure relief hole; 202, air cavity member; 202a, limit block; 202b, air inlet hole; 202c, ratchet; 202d, first connecting thread; 202e, axial scale line; 203, piston member; 203a, piston rod; 203b, buffer block; 20 3b-1, piston chamber; 204, connecting part; 204a, piston; 3, adjusting mechanism; 301, spinning part; 301a, second connecting thread; 301b, radial scale line; 301c, pawl chamber; 301d, connecting rod; 302, pawl assembly; 302a, pawl; 302b, pull rod; 302c, return spring; 302d, control button; 4, diaphragm; 401, connecting chamber; 402, sealing diaphragm; 403, positioning ring; 404, elastic contact area; 5, sealing sheet. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] Embodiment 1 This embodiment provides a pneumatic diaphragm valve that can control flow. Figures 1 to 8 , comprising a valve body 1, wherein the valve body 1 comprises a liquid inlet chamber 101, a valve chamber 102, a valve port 103, a valve seat 104, and a liquid outlet chamber 105 on the other side opposite to the liquid inlet chamber 101; a driving mechanism 2, wherein the driving mechanism 2 is arranged above the valve body 1, and comprises a valve cover 201, an air chamber member 202 arranged above the valve cover 201, a piston member 203 arranged in the air chamber member 202, and a connecting member 204 arranged below the piston member 203; an adjusting mechanism 3, wherein the adjusting mechanism 3 comprises a spinning member 301, and a pawl assembly 302 arranged on one side of the spinning member 301; a diaphragm 4, wherein the diaphragm 4 is disposed at the valve port 103 and connected to the driving mechanism 2 via the connecting member 204, and is the main mechanism for achieving sealing of the pneumatic diaphragm valve; a sealing sheet 5, wherein the sealing sheet 5 is arranged between the valve cover 201 and the valve body 1.

[0021] The air cavity part 202 includes a limit block 202a arranged at the bottom thereof, an air inlet hole 202b opened on one side of the air cavity part 202 and passing through, a ratchet 202c fixedly connected to the top of the air cavity part 202, a first connecting thread 202d arranged below the ratchet 202c, and a plurality of axial scale lines 202e opened below the first connecting thread 202d; the spin-pressed part 301 is cylindrical, buckled over the air cavity part 202, and threadedly connected to the air cavity part 202 through a second connecting thread 301a, and also includes a plurality of radial scale lines 301b arranged on its outer wall, a ratchet cavity 301c opened on its inner wall, and a connecting rod 301d arranged inside it.

[0022] A flowmeter 106 is provided in the liquid outlet cavity 105 for monitoring the liquid outlet flow rate of the diaphragm valve; a valve cover cavity 201a is provided in the valve cover 201, and the valve cover cavity 201a cooperates with the limit block 202a; the piston member 203 includes a piston rod 203a, and a buffer block 203b provided on the other side of the piston rod 203a; a piston cavity 203b-1 is provided in the buffer block 203b; one end of the connecting member 204 is a piston 204a, and the other end is inserted into the diaphragm 4, fitting the shape of the inner wall of the diaphragm 4, and the degree to which the diaphragm 4 fits the valve port 103 can be controlled by lifting and lowering the connecting member 204.

[0023] The pawl assembly 302 includes a pawl 302a, a pull rod 302b disposed on one side of the pawl 302a, a return spring 302c disposed on the outer ring of the pull rod 302b, and a control button 302d disposed on the other end of the pull rod 302b, and the control button 302d is disposed on the outer wall of the spin-pressed part 301; the pawl 302a cooperates with the ratchet wheel 202c; the diaphragm 4 includes a connecting cavity 401, a sealing diaphragm 402 disposed on one side of the connecting cavity 401, and a control button 302d disposed on the other end of the pull rod 302b. A positioning ring 403 is arranged on the periphery of the sealing diaphragm 402, and an elastic contact area 404 is arranged at the bottom of the connecting cavity 401; the top of the valve port 103 is a uniformly wavy structure with uneven surfaces, and the size of the entrance of the valve port 103 can be adjusted by adjusting the degree to which the diaphragm 4 fits the valve port, thereby realizing flow regulation. The valve body 1, the sealing plate 5 and the valve cover 201 are fixedly connected by multiple screws around them; a pressure relief hole 201b is provided at the joint between the valve cover 201 and the sealing plate 5.

[0024] It should be noted that the valve body 1 is the main body of the entire pneumatic diaphragm valve. The fluid enters from the liquid inlet chamber 101, passes through the valve chamber 102, and finally enters the liquid outlet chamber 105 from the valve port 103. This path forms a closed fluid channel. The main function of the valve body 1 is to carry the fluid and provide an inlet and outlet channel for the fluid. At the same time, the flow control is achieved through the cooperation of the valve port 103 and the diaphragm 4. The valve seat 105 serves as a support. The valve cover 201 is installed above the valve body 1. The valve body 1 and the valve cover 201 are separated by a sealing sheet 5. The valve cover 201, the sealing sheet 5, and the valve body 1 are fixed in sequence by screws at the four corners to form a tight connection. The sealing sheet 5 is used to prevent fluid and gas leakage to ensure the sealing performance of the diaphragm valve.

[0025] Preferably, a flowmeter 106 is installed in the liquid outlet chamber 105 to facilitate real-time monitoring of the flow rate. A rotor flowmeter is used in this embodiment, which utilizes the fluid flow to drive the rotor to rotate. The rotation speed of the rotor is proportional to the flow rate, and the flow rate information is transmitted to the outside of the valve for monitoring through an electrical signal. In other embodiments of the present invention, an electromagnetic flowmeter or an ultrasonic flowmeter may also be used to achieve more accurate flow rate monitoring.

[0026] Better, refer to Figure 3 The driving mechanism 2 is located above the valve body 1, and the limit block 202a is fixed at the bottom of the air cavity part 202. A through hole is opened in the middle of the limit block 202a for the connecting part 204 to pass through. The limit block 202a of the air cavity part 202 cooperates with the inner wall of the valve cover cavity 201a, and the top of the limit block 202a abuts against the top of the valve cover cavity 201a, which is used to limit the air cavity part 202 to prevent the air cavity part 202 from axially rotating and can only move up and down. At the same time, the bottom of the limit block 202a is elastically connected to the bottom of the valve cover cavity 201a through a spring.

[0027] Preferably, the air inlet hole 202b is provided on the side of the air cavity part 202 and is connected thereto. An air inlet pump is connected to the outside of the air inlet hole 202b. A normally closed valve is used to control the opening and closing of the air inlet pump. When the air control part does not supply air, the valve is closed. To open the valve, a certain air pressure needs to be maintained (the air control port is connected to the air source). The ratchet 202c is fixed to the top of the outer wall of the air cavity part 202, corresponding to the pawl assembly 302 on the spinning part 301. The first connecting thread 202d is provided below the ratchet 202c. It should be noted that the diameter of the first connecting thread 202d should be about 1 / 10 wider than the diameter of the ratchet 202c to prevent interference between the two. A plurality of axial scale lines 202e are engraved below the first connecting thread 202d. The axial scale lines 202e are marked with scales. The lowest point of the scale is the zero scale line, and the scale values ​​increase successively upward.

[0028] Preferably, the spin-formed component 301 is threadedly connected to the first connecting thread 202d on the air cavity component 202 by a second connecting thread 301a provided on its inner wall, and is moved up and down by screwing. The outer wall of the spin-formed component 301 is provided with a plurality of vertical radial scale lines 301b surrounding its end face, and the spacing of the radial scale lines 301b corresponds to a ratchet tooth pitch of the ratchet 202c, so that the corresponding scale and reading can be more conveniently performed when the pawl 302a is engaged with the ratchet 202c. A pawl cavity 301c is provided in the spin-formed component 301, and a hinged rod for fixing the position of the pawl 302a is fixedly connected in the pawl cavity 301c.

[0029] Preferably, the piston member 203 is composed of a piston rod 203a and a buffer block 203b. The piston in the piston rod 203a is close to the inner wall of the air chamber member 202. At the same time, a connecting cavity is opened on the piston rod 203a, which is hinged to the connecting rod 301d inside the spinning member 301. When the spinning member 301 is spun, the piston rod 203a will be continuously pushed downward without driving the piston to rotate, so as to ensure the sealing effect.

[0030] Preferably, the upper end of the connecting piece 204 is a piston 204a, and the buffer block 203b is inside a piston chamber 203b-1. The piston 204a is inserted into the piston chamber 203b-1. A certain amount of gas is stored in the piston chamber 203b-1 to form air pressure. This part of the piston mechanism is used to buffer the downward pressure of the connecting piece 204. Its function is to adapt to the thermal expansion and contraction of the material when the liquid temperature changes, effectively absorb vibration, provide a smoother connection, and improve the stability of the system. The lower end of the connecting piece 204 cooperates with the connecting chamber 401 of the diaphragm 4. When the connecting piece 204 and the connecting chamber 401 are connected, the two can be regarded as a whole, and the degree to which the diaphragm 4 fits the valve port 103 is controlled by raising and lowering the connecting piece 204.

[0031] Preferably, the positioning ring 403 in the diaphragm 4 fits the inner wall of the valve cavity 102 for fixing the position. When the diaphragm 4 fits the valve port 103, its deformation position is called the elastic contact area 404. The contact part between the elastic contact area 404 and the valve port 103 is arc-shaped. The top shape of the valve port 103 is an uneven uniform wavy structure. When the elastic contact area 404 is in contact, due to the wavy structure, the liquid flow will show a gradual decreasing trend, and the flow velocity of the liquid will decrease more slowly, so that the regulating mechanism 3 can be adjusted easily.

[0032] Preferably, in the diaphragm valve of this embodiment, the valve body 1, the valve cover 201 and the diaphragm 4 are all made of soluble polytetrafluoroethylene (PFA) material. The PFA material has good chemical corrosion resistance, heat resistance and friction resistance, and is very suitable for making diaphragm valves, especially in the chemical, medical and food industries.

[0033] Preferably, the reading method of the device is similar to that of a micrometer screw, observing the staggered position of the axial scale line 202e and the radial scale line 301b. Specifically, first observe the maximum observable scale on the axial scale line 202e, which is the main scale reading, and then observe the scale reading on the radial scale line 301b at the staggered position with the center scale on the axial scale line 202e, which is the differential scale reading. The two readings are added together to obtain the final total reading. Since the ratchet teeth correspond to the radial scale lines 301b, no estimation is required.

[0034] In summary, the pneumatic diaphragm valve capable of controlling flow rate of the present invention enables the user to finely adjust the flow rate through the spinning part and the ratchet assembly in the regulating mechanism. The user can adjust the internal air pressure by rotating the spinning part to adjust the fit between the diaphragm and the valve port, thereby changing the flow rate of the fluid. This design makes the flow rate regulation more flexible and adapts to the flow rate requirements under different working conditions, especially in applications where the flow rate needs to be precisely controlled (such as chemical, pharmaceutical, food, etc.), which can effectively improve production efficiency and product quality.

[0035] Embodiment 2 The present invention provides a method for using a pneumatic diaphragm valve that can control flow. Figures 1 to 9 , including the following steps: Step A: Sealing test; Step A1: first, pull out the control button 302d in the pawl assembly 302 to disengage the pawl 302a from the ratchet 202c. After disengagement, screw the spin-pressed component 301 to the "zero scale" position, that is, when the first connecting thread 202d is engaged with the second connecting thread 301a, screw the spin-pressed component 301 to align the zero scale position of the axial scale line 202e with the zero scale position of the radial scale line 301b, and the zero scale position of the axial scale line 202e is at the lowest position; Step A2: After step A1 is completed, insert the control button 302d so that the end of the pawl 302a is inserted into the tooth groove of the ratchet 202c. At this time, the spinning part 301 can only rotate in the downward rotation direction. When rotating in the upward rotation direction, it will be limited by the pawl 302a and cannot rotate; Step A3: The fluid is input into the valve cavity 102 through the liquid inlet cavity 101 at a certain rate, and flows out from the liquid outlet cavity 105. Since it is at the zero scale position at this time, the liquid flow rate of the liquid outlet cavity 105 will not be too much. At the same time, the air inlet valve is opened, and air is continuously supplied to the air cavity 202 through the air inlet hole 202b. While the air is being supplied, the flow meter 106 in the liquid outlet cavity 105 is observed. When the flow rate displayed by the flow meter 106 drops to zero, the air supply is stopped, and the liquid inlet cavity 101 maintains the liquid inlet rate; Step A4: close the air inlet valve and maintain the liquid inlet state for 10 to 20 minutes. After confirming that no fluid flows out of the liquid outlet cavity 105, stop the test and the device sealing test is completed. Step B: Zero adjustment test; Step B1: Following step A4, the sealing test is completed and zeroing is started. The sealing test state is maintained, and the pressure is gradually released through the pressure relief valve on the pressure relief hole 201b. Specifically, the pressure relief is stopped after 1 second. The flow meter 106 is left standing for half a minute to observe whether the reading fluctuates. If there is no change, the pressure relief cycle is continued until the flow meter 106 produces a slight reading, and the cycle is stopped. The zeroing is completed; Step C: test and collect flow rate data; Step C1: Rotate the spinning part 301 one circle to move the axial scale line 202e up one grid, let it stand for half a minute, and record the flow rate of the flow meter 106; record the liquid flow rate corresponding to each scale and make statistics; Step C2: draw a graph, fit the function, and obtain the fitting function equation; Step C3: Substitute data for verification; Step D: Use of diaphragm valve; Step D1: Find the corresponding scale by fitting the function equation according to the required liquid flow rate; Step D2: Adjust the spinning part 301 to find the corresponding scale, maintain the fluid inlet rate and start using; Step D3: During use, the position of the spinning part 301 can be adjusted at any time to change the scale to adjust the liquid outlet rate to control the flow rate, and finally the flow meter 106 can be used for verification again.

[0036] like Fig. 9 The figure shows the fitting function curve obtained by experimental simulation using this method in this embodiment, wherein △P represents the pressure applied by the fluid entering the diaphragm valve, i.e., the hydraulic pressure, which is 0.1Mpa and 0.2Mpa respectively, and the same set of curves corresponding to the two vertical coordinates are obtained. Fluid one uses room temperature liquid water, and fluid two uses room temperature vegetable oil. Under the condition of controlling the same fluid hydraulic pressure, it can be observed that the flow rate of room temperature liquid water is faster than that of room temperature vegetable oil. After the function curve is formulated, the axial scale line indication can be changed by adjusting the spinning part 301 to control the fluid discharge rate. After testing and inspection by the flow meter 106, the control error of this function is small, and the final error of the flow rate is between 3% and 5%, thereby proving the feasibility of this method.

[0037] In summary, the pneumatic diaphragm valve that can control flow and the method of using the same of the present invention include a sealing test, a zeroing test, data statistics, and a fitting function before being put into use. This structured process makes the operation more systematic, the reliability of the equipment is enhanced through the sealing test, the accuracy of the operation is improved through the zeroing test, the corresponding scale is found using the fitting function equation, and the real-time monitoring of the flow rate by a flow meter improves the response speed of the system. The user can quickly adjust the flow rate as needed during operation, avoiding the response lag problem in the traditional valve adjustment process. This high-efficiency flow adjustment capability can significantly improve the flexibility and efficiency of the production line and meet rapidly changing production needs.

[0038] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A pneumatic diaphragm valve capable of controlling flow, characterized in that: include, A valve body (1), the valve body (1) comprising a liquid inlet chamber (101), a valve chamber (102), a valve port (103), a valve seat (104), and a liquid outlet chamber (105) on the other side opposite to the liquid inlet chamber (101); A driving mechanism (2), the driving mechanism (2) being arranged above the valve body (1), comprising a valve cover (201), an air chamber component (202) arranged above the valve cover (201), a piston component (203) arranged in the air chamber component (202), and a connecting component (204) arranged below the piston component (203); An adjusting mechanism (3), the adjusting mechanism (3) comprising a spinning component (301), and a ratchet assembly (302) arranged on one side of the spinning component (301); A diaphragm (4), the diaphragm (4) being disposed at the valve port (103) and connected to the driving mechanism (2) via a connecting piece (204), and being a main mechanism for achieving sealing of the pneumatic diaphragm valve; A sealing sheet (5), wherein the sealing sheet (5) is arranged between the valve cover (201) and the valve body (1); The air cavity component (202) comprises a limit block (202a) arranged at the bottom thereof, an air inlet hole (202b) opened at one side of the air cavity component (202) and passing through, a ratchet (202c) fixedly connected to the top of the air cavity component (202), a first connecting thread (202d) arranged below the ratchet (202c), and a plurality of axial scale lines (202e) opened below the first connecting thread (202d); The spin-pressed component (301) is cylindrical, buckled over the air cavity component (202), and threadedly connected to the air cavity component (202) via a second connecting thread (301a), and further comprises a plurality of radial scale lines (301b) arranged on its outer wall, a ratchet cavity (301c) opened on its inner wall, and a connecting rod (301d) arranged inside it.

2. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 1, characterized in that: A flow meter (106) is provided in the liquid outlet cavity (105) for monitoring the liquid outlet flow rate of the diaphragm valve.

3. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 2, characterized in that: A valve cover cavity (201a) is provided in the valve cover (201), and the valve cover cavity (201a) cooperates with the limit block (202a).

4. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 3, characterized in that: The piston member (203) comprises a piston rod (203a) and a buffer block (203b) arranged on the other side of the rod portion of the piston rod (203a); A piston cavity (203b-1) is provided in the buffer block (203b).

5. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 1, characterized in that: One end of the connecting piece (204) is a piston (204a), and the other end is inserted into the diaphragm (4) and fits the shape of the inner wall of the diaphragm (4). The degree to which the diaphragm (4) fits the valve port (103) can be controlled by lifting and lowering the connecting piece (204).

6. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 1, characterized in that: The pawl assembly (302) comprises a pawl (302a), a pull rod (302b) arranged on one side of the pawl (302a), a return spring (302c) arranged on the outer ring of the pull rod (302b), and a control button (302d) arranged on the other end of the pull rod (302b), wherein the control button (302d) is arranged on the outer wall of the spinning component (301); The pawl (302a) cooperates with the ratchet wheel (202c).

7. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 3, characterized in that: The diaphragm (4) comprises a connecting cavity (401), a sealing diaphragm (402) arranged on one side of the connecting cavity (401), a positioning ring (403) arranged on the periphery of the sealing diaphragm (402), and an elastic contact area (404) arranged at the bottom of the connecting cavity (401).

8. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 7, characterized in that: The top of the valve port (103) is in a uniformly wavy structure with uneven surfaces. By adjusting the degree to which the diaphragm (4) fits the valve port, the size of the inlet of the valve port (103) can be adjusted to achieve flow regulation.

9. A pneumatic diaphragm valve capable of controlling flow rate as claimed in claim 8, characterized in that: The valve body (1), the sealing sheet (5) and the valve cover (201) are fixedly connected by a plurality of screws on all sides; A pressure relief hole (201b) is provided at the joint between the valve cover (201) and the sealing sheet (5).

10. A method for using the pneumatic diaphragm valve capable of controlling flow as claimed in claim 9, characterized in that: The steps include: Step A: Sealing test; Step A1: first, pull out the control button (302d) in the pawl assembly (302) to disengage the pawl (302a) from the ratchet wheel (202c). After disengagement, screw the rotary pressing member (301) to the "zero scale" position, that is, when the first connecting thread (202d) is engaged with the second connecting thread (301a), screw the rotary pressing member (301) to align the zero scale position of the axial scale line (202e) with the zero scale position of the radial scale line (301b) so that the zero scale position of the axial scale line (202e) is at the lowest position. Step A2: After completing step A1, insert the control button (302d) so that the end of the pawl (302a) is inserted into the tooth groove of the ratchet (202c). At this time, the spin-pressed component (301) can only rotate in the downward direction. When rotating in the upward direction, it will be limited by the pawl (302a) and cannot rotate; Step A3: The fluid is input into the valve cavity (102) through the liquid inlet cavity (101) at a certain rate and flows out from the liquid outlet cavity (105). Since the liquid outlet cavity (105) is at the zero scale position at this time, the liquid flow rate of the liquid outlet cavity (105) is not too much. At the same time, the air inlet valve is opened, and air is continuously supplied to the air cavity (202) through the air inlet hole (202b). While the air is being supplied, the reading of the flow meter (106) in the liquid outlet cavity (105) is observed. The air supply is stopped until the flow rate displayed by the flow meter (106) drops to zero, and the liquid inlet cavity (101) maintains the liquid supply rate. Step A4: close the air inlet valve and maintain the liquid inlet state for 10 to 20 minutes. After confirming that no more fluid flows out of the liquid outlet chamber (105), stop the test and the device sealing test is completed. Step B: Zero adjustment test; Step B1: Following step A4, the sealing test is completed and zeroing is started. The sealing test state is maintained and the pressure is gradually released through the pressure relief valve on the pressure relief hole (201b). Specifically, the pressure relief is stopped after 1 second. The flow meter (106) is left to stand for half a minute to observe whether the reading fluctuates. If there is no change, the pressure relief cycle is continued until the flow meter (106) produces a slight reading, and the cycle is stopped. The zeroing is completed. Step C: test and collect flow rate data; Step C1: Rotate the spinning part (301) one circle to move the axial scale line (202e) up one grid, let it stand for half a minute, and record the flow rate of the flow meter (106); record the liquid flow rate corresponding to each scale and make statistics; Step C2: draw a graph, fit the function, and obtain the fitting function equation; Step C3: Substitute data for verification; Step D: Use of diaphragm valve; Step D1: Find the corresponding scale by fitting the function equation according to the required liquid flow rate; Step D2: Adjust the spinning part (301) to find the corresponding scale, maintain the fluid inlet rate and start using; Step D3: During use, the position of the spinning part (301) can be adjusted at any time to change the scale to adjust the liquid outlet rate to control the flow rate, and finally the flow meter (106) can be used for verification again.

Images