Air switching valve for diaphragm pump

Abstract

The invention relates to the technical field of air switching valves, in particular to an air switching valve for a diaphragm pump, which comprises a switching mechanism and a closing mechanism, a filtering mechanism is arranged at the bottom of the switching mechanism, a switching valve body is arranged on the rear side of the closing mechanism, and the switching mechanism comprises an air adjusting assembly, an air control assembly, a switch assembly, an adjusting assembly and a filtering assembly. The air control assembly is arranged on the surface of the air adjusting assembly, the switch assembly is arranged on the inner side of the air control assembly, the adjusting assembly is arranged at the bottom of the switch assembly, the filtering assembly is arranged at the bottom of the adjusting assembly, and the sealing mechanism comprises an indicating assembly, a pressure assembly, a sealing assembly and a conveying assembly. The air switching valve for the diaphragm pump has the advantages that the air switching valve for the diaphragm pump is provided with a filtering adjusting structure which shares a power source with a pneumatic pump, so that the filtering mode can be quickly adjusted in the environment that a motor cannot be used as a power source, and the flexibility of filtering air fed into the switching valve is improved.

Description

Technical Field

[0001] This invention relates to the field of air switching valve technology, specifically to an air switching valve for a diaphragm pump. Background Technology

[0002] As is well known, the air switching valve for diaphragm pumps is a core air circuit control component adapted to diaphragm pumps. It achieves automatic switching of the air circuit based on the pneumatic drive principle. By controlling the direction of compressed air in and out, it drives the diaphragm of the diaphragm pump to reciprocate, thereby providing power for the diaphragm pump to transport the medium. As a key component of the diaphragm pump air circuit system, it directly connects the compressed air source and the diaphragm pump actuator, ensuring the smoothness of the diaphragm pump air circuit switching and the continuity of pump operation. It is an important supporting device for diaphragm pumps to realize the medium transport function.

[0003] A search revealed a Chinese patent, CN110529625B, which discloses a powerful switching valve. This patent includes a movable cylinder and a fixed base. The movable cylinder is mounted on the upper end of the fixed base, and a housing is provided on the lower outer wall of the fixed base. A fixing hole is provided on the front outer wall of the housing, and a connecting pipe is provided on the right outer wall of the housing. A fixing ring is provided on the lower outer wall of the housing, and a downward-extending inlet is provided on the lower circumferential outer wall of the fixing ring. By designing a powerful switching valve, one end of the valve is connected to the air inlet and outlet of a blower via two connecting pipes. The blower provides strong suction to the switching valve, and the movable cylinder at the upper end of the valve controls the raising and lowering of the movable rod inside the valve. The movable cylinder's action enables the suction and release of products, solving the problem of insufficient suction in conventional switching valves for hollow products, thus greatly improving the production and conveying efficiency of the products.

[0004] When switching the air path of the diaphragm pump, the automatic adjustment of the switching valve is used to switch the air path so that the diaphragm pump can operate normally. The problem with the existing technology is that when filtering the input gas, due to the lack of a filter adjustment structure that shares a common power source with the pneumatic pump, it is not possible to quickly adjust the filtration method in environments where an electric motor cannot be used as a power source, which reduces the flexibility of filtering the air fed into the switching valve. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides an air switching valve for diaphragm pumps, which has a filtration and adjustment structure that shares a power source with the pneumatic pump. Therefore, it can quickly adjust the filtration method in environments where an electric motor cannot be used as a power source, thus improving the flexibility of filtering the air fed into the switching valve.

[0007] (II) Technical Solution

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an air switching valve for a diaphragm pump, comprising a switching mechanism and a sealing mechanism, wherein a filtering mechanism is disposed at the bottom of the switching mechanism, and a switching valve body is disposed at the rear side of the sealing mechanism; the switching mechanism comprises an air regulating component, an air control component, a switching component, an adjusting component, and a filtering component; the air control component is disposed on the surface of the air regulating component, the switching component is disposed inside the air control component, the adjusting component is disposed at the bottom of the switching component, and the filtering component is disposed at the bottom of the adjusting component; the sealing mechanism comprises an indicating component, a pressure component, a sealing component, and a conveying component; the indicating component is disposed at the bottom of the air control component, the pressure component is disposed at the bottom of the indicating component, the sealing component is disposed inside the pressure component, and the conveying component is disposed at the bottom of the sealing component.

[0009] By adopting the above technical solution, a switching mechanism and a sealing mechanism are set up. The switching mechanism is a structure that controls the air path inside the sealing mechanism. It can control the air flow rate and filter impurities in the air. The sealing mechanism is a structure that provides a seal for the switching mechanism, which can increase the airtightness of the switching mechanism during operation.

[0010] The present invention is further configured such that: the gas regulating assembly includes a sealing ring, a sealing layer ring, and a regulating valve, wherein the sealing layer ring is bolted to the bottom of the sealing ring, and the regulating valve is connected to the front side of the sealing ring.

[0011] By adopting the above technical solution, and by setting up an air regulating component, the sealing ring, the sealing layer ring, and the regulating valve form an regulating structure. The position of the regulating component can be adjusted so that it can change the filtration state of the sealing mechanism. The sealing ring and the sealing layer ring provide support and limit for the regulating valve, allowing the sealing ring, the sealing layer ring, and the air regulating component to form a closed space. This provides support for the switching component and the regulating component, and the regulating component and the switching component divide this space into two different sealed spaces. The position of the regulating component can be changed by filling the sealed space formed by the sealing ring, the sealing layer ring, and the regulating component with gas.

[0012] The present invention is further configured such that: the gas control assembly includes a top gas chamber cover, a T-shaped separator cylinder and a return spring, the top gas chamber cover is bolted to the top of the sealing ring, the T-shaped separator cylinder is bolted to the bottom of the sealing ring, and the return spring is bolted to the bottom of the inner side of the T-shaped separator cylinder.

[0013] By adopting the above technical solution, the air control component, the top air chamber cover, the T-shaped separator, and the return spring form a closed structure that can be combined with the switch component to form another closed space. This allows the position of the filter component to be changed so that it can come into contact with the closed mechanism to change the air path. The closed structure formed by the top air chamber cover, the sealing ring, the regulating valve, and the T-shaped separator allows the switch component to form a closed structure with the top air chamber cover, pushing the filter component to move and change the air path state of the closed mechanism. The return spring can reset the regulating component and the switch component as a whole within the T-shaped separator.

[0014] The present invention is further configured such that: the switching assembly includes an upper diaphragm, a guide rod, and a valve seat; the upper diaphragm is bolted to the bottom of the top air chamber cover; the bottom of the upper diaphragm is bolted to the top of the closing ring; the guide rod is bolted to the bottom of the upper diaphragm; and the valve seat is bolted to the bottom of the guide rod.

[0015] By adopting the above technical solution, the air path control structure composed of the upper diaphragm, guide rod, and valve seat, through the setting of the switching component, can cooperate with the conveying component to control the air path fed into the switching valve. Through the closed structure composed of the upper diaphragm and the top air chamber cover, when an air conveying device is connected to the top air chamber cover, air can be supplied to it to cause the upper diaphragm to expand, thereby allowing the upper diaphragm to drive the guide rod to move the valve seat downward, thus allowing the valve seat to cooperate with the conveying component to change the air path.

[0016] The present invention is further configured such that: the adjusting assembly includes a lower diaphragm, a support plate, and a return spring; the lower diaphragm is bolted to the bottom of the sealing ring; the bottom of the lower diaphragm is bolted to the top of the T-shaped separating cylinder; the support plate is bolted to the top of the lower diaphragm; the return spring is bolted to the top of the support plate; and the top of the return spring contacts the bottom of the upper diaphragm.

[0017] By adopting the above technical solution, the filter adjustment structure composed of the lower diaphragm, support plate, and return spring can be adjusted by setting an adjustment component. This allows the filter component to be connected to the conveying component and form a filter structure. The lower diaphragm is located between the sealing ring and the closing ring, and forms a sealed space with the upper diaphragm on the closing ring. When air is introduced into the space by the regulating valve, the lower diaphragm expands downward, which drives the support plate to push the filter component downward. This allows the filter component to cooperate with the conveying component to form a filter structure. Furthermore, the return spring can use its own elasticity to reset the upper diaphragm when the valve seat needs to be reset, thus maintaining the connection between the filter component and the conveying component.

[0018] The present invention is further configured such that: the filter assembly includes a hollow slide rod, a sealing ring, and a funnel filter screen; the hollow slide rod is bolted to the bottom of the support plate; the sealing ring is bolted to the bottom of the hollow slide rod; the funnel filter screen is bolted to the bottom of the hollow slide rod; the inner side of the hollow slide rod is in contact with the surface of the guide rod; and the inner side of the funnel filter screen is in contact with the surface of the valve seat.

[0019] By adopting the above technical solution, a filter structure is formed by setting up a filter assembly, in which a hollow slide rod, a sealing ring, and a funnel filter screen are combined. This structure can be temporarily connected to the conveying assembly to form a filter structure, which can perform preliminary filtration of impurities in the air flowing through the conveying assembly. As the support plate moves, the hollow slide rod can drive the sealing ring to move the funnel filter screen towards the conveying assembly, thereby sealing its input end and leaving only the funnel filter screen for air circulation. Through the sealing of the sealing ring, the funnel filter screen can be tightly fitted to the input end of the conveying assembly, and the funnel filter screen can intercept impurities in the air flowing through it.

[0020] The present invention is further configured such that: the indicating component includes a movable tube, a glass window and an indicator, the movable tube is connected to the bottom of the T-shaped separation cylinder, the glass window is fixedly connected to the surface of the movable tube, the indicator is bolted to the surface of the guide rod, and the surface of the indicator penetrates the surface of the hollow slide rod and is slidably connected to the hollow slide rod.

[0021] By adopting the above technical solution, by setting an indicator component, the movable tube, the glass window, and the indicator mark form a gas path adjustment indicator structure, which allows users to more intuitively observe the gas path adjustment status. The movable tube provides support for the glass window, allowing the indicator mark to move synchronously with the up and down movement of the guide rod. By changing its relative position with the glass window, an additional scale can be installed on the movable tube near the glass window, so that the relative position of the indicator mark and the scale can be observed through the glass window to determine the current gas path status.

[0022] The invention is further configured such that: the pressure assembly includes a pressure pipe, a suction valve, and a replenishment cover; the pressure pipe is connected to the bottom of the movable pipe; the suction valve is connected to the surface of the pressure pipe; and the replenishment cover is snapped onto the input end of the suction valve.

[0023] By adopting the above technical solution, a positive pressure structure is formed by setting up a pressure component, a pneumatic pipe, an air extraction valve, and a replenishment cover. This structure can provide positive pressure to the sealing component, thereby increasing its sealing effect. The pneumatic pipe provides support for the sealing component, allowing it to maintain contact with the delivery component. The air extraction valve can deliver pressure into the pneumatic pipe through an external air delivery structure, and the replenishment cover seals the air extraction valve, maintaining positive pressure inside the pneumatic pipe. It can also supplement the positive pressure inside the pneumatic pipe when it is insufficient.

[0024] The present invention is further configured such that: the sealing assembly includes an airbag, a sealing ring, and a sealing plate; the airbag is snapped into the bottom of the inner side of the air pressure pipe; the sealing ring is bolted to the bottom of the airbag; and the sealing plate is snapped into the top of the airbag.

[0025] By adopting the above technical solution, a sealing structure is formed by setting a sealing component, an airbag, a sealing ring, and a sealing plate. This structure can provide a seal for the connection between the sealing component and the conveying component, and also for the movement of the hollow slide rod. When the sealing plate is squeezed by the pressure inside the air pipe, it can push the airbag downward, causing the airbag to expand downward under pressure. This pushes the sealing ring downward, increasing the airtightness of the connection between the sealing ring and the conveying component, and also increasing the airtightness of the contact between the sealing ring and the hollow slide rod.

[0026] The present invention is further configured such that: the conveying assembly includes an air inlet pipe, a partition plate and a frustum-shaped air inlet, the air inlet pipe is connected to the bottom of the air pressure pipe, the top of the air inlet pipe is in contact with the bottom of the air bag, the partition plate is welded to the inner side of the air inlet pipe, the frustum-shaped air inlet is opened at the top of the partition plate, and the inner side of the frustum-shaped air inlet is in contact with the bottom of the surface of the funnel filter screen.

[0027] By adopting the above technical solution, an air conveying structure consisting of an air inlet pipe, a partition plate, and a frustum-shaped air inlet can be set up to connect to an external air conveying device to deliver air into the switching valve body. At the same time, it can cooperate with the filter assembly and the switching assembly to change the air path. Through the pipeline structure consisting of the air inlet pipe, the partition plate, and the frustum-shaped air inlet, air can flow into the switching valve body in one direction through the frustum-shaped air inlet. The frustum-shaped air inlet can contact the funnel filter screen and be sealed by a sealing ring, allowing air to be sent in through the funnel filter screen. At the same time, the air path can be closed when the valve seat and the funnel filter screen are closed.

[0028] (III) Beneficial Effects

[0029] Compared with the prior art, the present invention provides an air switching valve for a diaphragm pump, which has the following advantages: This air switching valve for a diaphragm pump, through the setting of a switching mechanism, allows the air regulating component to form a structure for controlling the air path within the closed mechanism, together with the air control component, the switching component, the regulating component, and the filter component. This structure can control the airflow rate and filter impurities in the air. The regulating structure, composed of a sealing ring, a sealing layer ring, and a regulating valve, allows adjustment of the position of the regulating component, thus changing the filtration state of the closed mechanism. The closed structure, composed of a top-layer air chamber cover, a T-shaped separator, and a return spring, forms another closed space with the switching component, allowing the filter component to change its position and contact the closed mechanism to alter the air path. The air path control structure, composed of an upper diaphragm, a guide rod, and a valve seat, works with the conveying component to control the air path fed into the switching valve. The filtration adjustment structure, composed of a lower diaphragm, a support plate, and a return spring, changes the position of the filter component, allowing it to connect with the conveying component and form a filtration structure. The filtration structure, composed of a hollow slide rod, a sealing ring, and a funnel filter screen, can be temporarily connected to the conveying component to form a filtration structure, providing preliminary filtration of impurities in the air flowing through the conveying component. This air switching valve for a diaphragm pump features a sealing mechanism. The indicating component, pressure component, sealing component, and delivery component form a structure that provides a seal for the switching mechanism, increasing its airtightness during operation. A movable tube, glass window, and indicator form an air path adjustment indicator structure, allowing users to more intuitively observe the air path adjustment status. A pressure pipe, suction valve, and replenishment cover form a positive pressure structure, providing positive pressure to the sealing component and enhancing its sealing effect. An air bladder, sealing ring, and sealing plate form a sealing structure, providing a seal between the sealing component and the delivery component, and also sealing the movement of the hollow slide bar. An air delivery structure, consisting of an air inlet pipe, partition plate, and frustum-shaped air port, allows for connection to external air delivery equipment, supplying air into the switching valve body. It can also cooperate with a filter component and a switching component to change the air path. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the switching mechanism and the closing mechanism in this invention; Figure 3 This is a schematic diagram of the switching mechanism in this invention; Figure 4 This is a schematic diagram of the gas regulating component and the gas control component in this invention; Figure 5 This is a schematic diagram of the switching assembly in this invention; Figure 6 This is a schematic diagram of the structure of the regulating component and the filtering component in this invention; Figure 7 This is a schematic diagram of the closure mechanism in this invention; Figure 8 This is a schematic diagram of the structure of the indicator component in this invention; Figure 9 This is a schematic diagram of the pressure assembly and sealing assembly in this invention; Figure 10 This is a schematic diagram of the conveying component in this invention.

[0031] In the diagram: 1. Switching mechanism; 11. Gas regulating assembly; 111. Sealing ring; 112. Sealing ring; 113. Regulating valve; 12. Gas control assembly; 121. Top gas chamber cover; 122. T-shaped separator; 123. Return spring; 13. Switch assembly; 131. Upper diaphragm; 132. Guide rod; 133. Valve seat; 14. Regulating assembly; 141. Lower diaphragm; 142. Support plate; 143. Return spring; 15. Filter assembly; 151. Hollow 1. Slide rod; 152. Sealing ring; 153. Funnel filter screen; 2. Closing mechanism; 21. Indicating component; 211. Moving tube; 212. Glass window; 213. Indicator; 22. Pressure component; 221. Air pressure pipe; 222. Air extraction valve; 223. Replenishment cover; 23. Sealing component; 231. Airbag; 232. Sealing ring; 233. Sealing plate; 24. Conveying component; 241. Air inlet pipe; 242. Divider plate; 243. Frustum-shaped air inlet; 3. Switching valve body. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Please see Figure 1-6An air switching valve for a diaphragm pump includes a switching mechanism 1. The switching mechanism 1 includes an air regulating component 11, an air control component 12, a switching component 13, an adjusting component 14, and a filtering component 15. The air control component 12 is located on the surface of the air regulating component 11, the switching component 13 is located inside the air control component 12, the adjusting component 14 is located at the bottom of the switching component 13, and the filtering component 15 is located at the bottom of the adjusting component 14. By setting the switching mechanism 1, the air regulating component 11, together with the air control component 12, the switching component 13, the adjusting component 14, and the filtering component 15, forms a structure for controlling the airflow within a closed mechanism 2. This allows for control of the airflow rate and filtration of impurities in the air. The closing ring 111, together with the sealing ring 112 and the adjusting valve 113, forms an adjusting structure, allowing adjustment of the position of the adjusting component 14 to change the filtration state of the closed mechanism 2. The top air chamber... The enclosed structure formed by the cover 121, the T-shaped separating cylinder 122, and the return spring 123 can form another enclosed space with the switching assembly 13, thereby changing the position of the filter assembly 15 so that it can contact the sealing mechanism 2 to change the air path. The air path control structure formed by the upper diaphragm 131, the guide rod 132, and the valve seat 133 can cooperate with the conveying assembly 24 to control the air path fed into the switching valve. The filter adjustment structure formed by the lower diaphragm 141, the support plate 142, and the return spring 143 can change the position of the filter assembly 15, thereby connecting the filter assembly 15 with the conveying assembly 24 to form a filter structure. The filter structure formed by the hollow slide rod 151, the sealing ring 152, and the funnel filter screen 153 can be temporarily connected with the conveying assembly 24 to form a filter structure, which can perform preliminary filtration of impurities in the air flowing through the conveying assembly 24.

[0035] The gas regulating component 11 includes a sealing ring 111, a sealing ring 112, and a regulating valve 113. The sealing ring 112 is bolted to the bottom of the sealing ring 111, and the regulating valve 113 is connected to the front side of the sealing ring 111. By setting the gas regulating component 11, the sealing ring 111, the sealing ring 112, and the regulating valve 113 form an regulating structure, which can adjust the position of the regulating component 14 so that it can change the filtration state of the sealing mechanism 2. The sealing ring 111 and the sealing ring 112 provide support and limit for the regulating valve 113, allowing the sealing ring 111, the sealing ring 112, and the gas regulating component 12 to form a closed space, providing support for the switching component 13 and the regulating component 14, and allowing the regulating component 14 and the switching component 13 to divide this space into two different sealed spaces. The sealed space formed by the sealing ring 111, the sealing ring 112, and the regulating component 14 can have its position changed by filling with gas.

[0036] The gas control assembly 12 includes a top gas chamber cover 121, a T-shaped separator cylinder 122, and a return spring 123. The top gas chamber cover 121 is bolted to the top of the sealing ring 111, the T-shaped separator cylinder 122 is bolted to the bottom of the sealing ring 112, and the return spring 123 is bolted to the bottom of the inner side of the T-shaped separator cylinder 122. By setting the gas control assembly 12, the closed structure formed by the top gas chamber cover 121, the T-shaped separator cylinder 122, and the return spring 123 can form another closed structure with the switch assembly 13. The space allows the position of the filter assembly 15 to be changed so that it can come into contact with the sealing mechanism 2 to change the air path. The sealing structure formed by the top air chamber cover 121, the sealing ring 111, the regulating air valve 113 and the T-shaped separator 122 allows the switch assembly 13 to form a sealing structure with the top air chamber cover 121, pushing the filter assembly 15 to move and change the air path state of the sealing mechanism 2. The reset spring 123 can reset the regulating assembly 14 and the switch assembly 13 as a whole in the T-shaped separator 122.

[0037] The switching assembly 13 includes an upper diaphragm 131, a guide rod 132, and a valve seat 133. The upper diaphragm 131 is bolted to the bottom of the top air chamber cover 121, and the bottom of the upper diaphragm 131 is bolted to the top of the closing ring 111. The guide rod 132 is bolted to the bottom of the upper diaphragm 131, and the valve seat 133 is bolted to the bottom of the guide rod 132. By setting the switching assembly 13, the air path control structure formed by the upper diaphragm 131, the guide rod 132, and the valve seat 133 can cooperate with the conveying assembly 24 to control the air path fed into the switching valve. Through the closed structure formed by the upper diaphragm 131 and the top air chamber cover 121, when an air conveying device is connected to the top air chamber cover 121, air can be supplied to it to cause the upper diaphragm 131 to expand, thereby causing the upper diaphragm 131 to drive the guide rod 132 to move the valve seat 133 downward, so that the valve seat 133 cooperates with the conveying assembly 24 to change the air path.

[0038] The adjusting assembly 14 includes a lower diaphragm 141, a support plate 142, and a return spring 143. The lower diaphragm 141 is bolted to the bottom of the sealing ring 112, and the bottom of the lower diaphragm 141 is bolted to the top of the T-shaped separating cylinder 122. The support plate 142 is bolted to the top of the lower diaphragm 141, and the return spring 143 is bolted to the top of the support plate 142. The top of the return spring 143 contacts the bottom of the upper diaphragm 131. By setting the adjusting assembly 14, the filtration adjustment structure composed of the lower diaphragm 141, the support plate 142, and the return spring 143 can change the position of the filtration assembly 15, thereby allowing the filtration... Component 15 is connected to conveying component 24 to form a filter structure. The lower diaphragm 141 is located between sealing ring 112 and closing ring 111, and forms a sealed space with the upper diaphragm 131 on the closing ring 111. When air is introduced into the lower diaphragm 141 by regulating air valve 113, the lower diaphragm 141 expands downward, thereby driving the support plate 142 to push the filter component 15 downward, so that the filter component 15 and conveying component 24 cooperate to form a filter structure. The return spring 143 can use its own elasticity to reset the upper diaphragm 131 when the valve seat 133 needs to be reset, so that the filter component 15 remains connected to the conveying component 24.

[0039] The filter assembly 15 includes a hollow slide rod 151, a sealing ring 152, and a funnel-shaped filter screen 153. The hollow slide rod 151 is bolted to the bottom of the support plate 142, the sealing ring 152 is bolted to the bottom of the hollow slide rod 151, and the funnel-shaped filter screen 153 is bolted to the bottom of the hollow slide rod 151. The inner side of the hollow slide rod 151 contacts the surface of the guide rod 132, and the inner side of the funnel-shaped filter screen 153 contacts the surface of the valve seat 133. By setting the filter assembly 15, the hollow slide rod 151, the sealing ring 152, and the funnel-shaped filter screen 153 form a filter. The structure can be temporarily connected to the conveying assembly 24 to form a filter structure, which can perform preliminary filtration of impurities in the air flowing through the conveying assembly 24. With the movement of the support plate 142, the hollow slide rod 151 can drive the sealing ring 152 to move the funnel filter 153 towards the conveying assembly 24, thereby sealing its input end and leaving only the funnel filter 153 for air circulation. Through the sealing of the sealing ring 152, the funnel filter 153 can be tightly fitted to the input end of the conveying assembly 24, and the funnel filter 153 can intercept impurities in the air flowing through it.

[0040] The working principle of this embodiment is as follows: First, connect the air inlet pipe 241 to an external air delivery device, and then connect the output end of the air inlet pipe 241 to the switching valve body 3. Then, when air filtration and air path adjustment are required, connect the regulating valve 113 and the top air chamber cover 121 to different air delivery devices respectively. When air filtration is required, the regulating valve 113 sends in air, allowing the air to enter between the upper diaphragm 131 and the lower diaphragm 141. The lower diaphragm 141 will then begin to expand downwards, simultaneously pushing the support plate 142 to push the hollow slide rod 151 downwards. The funnel filter 153 will move synchronously into the frustum-shaped air inlet 243 until the sealing ring 152 closes with the frustum-shaped air inlet 243. At this time, the funnel filter 153 will filter the flowing air. When it is necessary to change the air path, air is supplied to the top air chamber cover 121. The air will fill the space between the top air chamber cover 121 and the upper diaphragm 131. The upper diaphragm 131 will expand downward after being filled with air, and at the same time push the guide rod 132 to move downward. The valve seat 133 will then contact and close with the funnel filter 153 located in the frustum-shaped air inlet 243. The truncated cone air port 243 is closed. The closure state of the truncated cone air port 243 depends on the amount of air supplied to the top air chamber cover 121. The more air supplied, the tighter the connection between the valve seat 133 and the truncated cone air port 243. The less air supplied, the larger the gap between the valve seat 133 and the truncated cone air port 243. The supplied air will change accordingly. When filtration is required and air supply efficiency is increased, the air in the top air chamber cover 121 is extracted. The return spring 143 will, due to its own elasticity, use the support plate 142 as a support point to reset the upper diaphragm 131, thereby driving the guide. When rod 132 and valve seat 133 move upward, the frustum air port 243 is exposed. When it is necessary to fully open the frustum air port 243 and directly supply air without filtration, the air in the upper diaphragm 131 and the lower diaphragm 141 is discharged by adjusting the air valve 113. The return spring 123 can use its own elasticity to reset the lower diaphragm 141. The support plate 142 will then drive the hollow slide rod 151 to move upward in sync. The funnel filter screen 153 and the sealing ring 152 will leave the frustum air port 243. The frustum air port 243 will no longer be obstructed and can directly supply air.

[0041] Example 2

[0042] refer to Figure 7-10An air switching valve for a diaphragm pump also includes a sealing mechanism 2. The sealing mechanism 2 includes an indicating component 21, a pressure component 22, a sealing component 23, and a delivery component 24. The indicating component 21 is located at the bottom of the air control component 12, the pressure component 22 is located at the bottom of the indicating component 21, the sealing component 23 is located inside the pressure component 22, and the delivery component 24 is located at the bottom of the sealing component 23. By providing the sealing mechanism 2, the indicating component 21, together with the pressure component 22, the sealing component 23, and the delivery component 24, forms a structure that provides a seal for the switching mechanism 1, increasing the airtightness of the switching mechanism 1 during operation. The valve, through the movable pipe 211, forms an air path adjustment and indicating structure with the glass window 212 and the indicator 213. The structure allows users to more intuitively observe the status of air path adjustment. The positive pressure structure formed by the air pressure pipe 221, the air extraction valve 222, and the replenishment cover 223 can provide positive pressure to the sealing component 23, thereby increasing its sealing effect. The sealing structure formed by the airbag 231, the sealing ring 232, and the sealing plate 233 can provide a seal for the connection between the sealing component 23 and the conveying component 24, and can also provide a seal for the movement of the hollow slide bar 151. The air conveying structure formed by the air inlet pipe 241, the partition plate 242, and the frustum air port 243 can be connected to an external air conveying device to deliver air into the switching valve body 3. It can also cooperate with the filter component 15 and the switch component 13 to change the air path.

[0043] The indicator component 21 includes a movable tube 211, a glass window 212, and an indicator 213. The movable tube 211 is connected to the bottom of the T-shaped separator 122. The glass window 212 is fixedly connected to the surface of the movable tube 211. The indicator 213 is bolted to the surface of the guide rod 132. The surface of the indicator 213 passes through the surface of the hollow slide rod 151 and is slidably connected to the hollow slide rod 151. By setting the indicator component 21, the movable tube 211, the glass window 212, and the indicator 213 form a gas path adjustment indicator structure, which allows the user to more intuitively observe the gas path adjustment status. The movable tube 211 provides support for the glass window 212, allowing the indicator 213 to move synchronously with the up and down movement of the guide rod 132. By changing its relative position with the glass window 212, an additional scale can be added to the movable tube 211 near the glass window 212, so that the relative position of the indicator 213 and the scale can be observed through the glass window 212 to determine the current gas path status.

[0044] The pressure assembly 22 includes a pressure pipe 221, an air extraction valve 222, and a replenishment cover 223. The pressure pipe 221 is connected to the bottom of the movable pipe 211, the air extraction valve 222 is connected to the surface of the pressure pipe 221, and the replenishment cover 223 is snapped onto the input end of the air extraction valve 222. By setting the pressure assembly 22, the pressure pipe 221, the air extraction valve 222, and the replenishment cover 223 form a structure that adds positive pressure, which can provide positive pressure to the sealing assembly 23, thereby increasing its sealing effect. The pressure pipe 221 provides support for the sealing assembly 23, allowing the sealing assembly 23 to maintain contact with the delivery assembly 24. The air extraction valve 222 can deliver pressure into the pressure pipe 221 through an external air delivery structure, and the replenishment cover 223 seals the air extraction valve 222, keeping the pressure pipe 221 under positive pressure. It can also replenish the positive pressure in the pressure pipe 221 through the air extraction valve 222 when the positive pressure is insufficient.

[0045] The sealing assembly 23 includes an airbag 231, a sealing ring 232, and a sealing plate 233. The airbag 231 is snapped into the bottom of the inner side of the air pressure pipe 221, the sealing ring 232 is bolted to the bottom of the airbag 231, and the sealing plate 233 is snapped into the top of the airbag 231. By setting the sealing assembly 23, the airbag 231, the sealing ring 232, and the sealing plate 233 form a sealing structure, which can provide a seal for the connection between the sealing assembly 23 and the conveying assembly 24, and at the same time provide a seal for the movement of the hollow slide rod 151. When the sealing plate 233 is squeezed by the pressure inside the air pressure pipe 221, it can push the airbag 231 downward, so that the airbag 231 expands downward when under pressure, thereby pushing the sealing ring 232 downward, increasing the airtightness of the connection between the sealing ring 232 and the conveying assembly 24, and at the same time increasing the airtightness of its contact with the hollow slide rod 151.

[0046] The conveying assembly 24 includes an air inlet pipe 241, a partition plate 242, and a frustum-shaped air inlet 243. The air inlet pipe 241 is connected to the bottom of the air pressure pipe 221, and the top of the air inlet pipe 241 contacts the bottom of the airbag 231. The partition plate 242 is welded to the inner side of the air inlet pipe 241. The frustum-shaped air inlet 243 is located on the top of the partition plate 242, and the inner side of the frustum-shaped air inlet 243 contacts the bottom of the surface of the funnel filter screen 153. By setting the conveying assembly 24, the air conveying structure composed of the air inlet pipe 241, the partition plate 242, and the frustum-shaped air inlet 243 can... An external air delivery device supplies air into the switching valve body 3. It can also work with the filter assembly 15 and the switch assembly 13 to change the air path. Through the pipeline structure formed by the air inlet pipe 241, the partition plate 242 and the frustum air port 243, air can flow into the switching valve body 3 in one direction through the frustum air port 243. The frustum air port 243 can contact the funnel filter screen 153 and be sealed by the sealing ring 152, allowing air to be sent in through the funnel filter screen 153. At the same time, the air path can be closed when the valve seat 133 and the funnel filter screen 153 are closed.

[0047] The working principle of this embodiment is as follows: During the process of air being sent into the switching valve body 3 through the air inlet pipe 241, the air supply cover 223 is opened, and the air extraction valve 222 is connected to an external air delivery device. The air extraction valve 222 sends air into the air pressure pipe 221, creating positive pressure inside the air pressure pipe 221. This positive pressure pushes the sealing plate 233 downwards. The airbag 231, under the push of the sealing plate 233, pushes the sealing ring 232 downwards to increase the sealing performance. The airbag 231 expands downwards and tightly wraps the hollow slide rod 151, further increasing the sealing performance. Since the guide rod 132 moves up and down during the process of changing the air path, it will synchronously drive the indicator 213 to move up and down at the glass window 212. At this time, the user can observe the relative position of the indicator 213 and the pre-set scale on the surface of the movable pipe 211 through the glass window 212 to judge the current air path status.

[0048] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. Those skilled in the art can make modifications to this embodiment without contributing any inventive step after reading this specification. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air switching valve for a diaphragm pump, comprising a switching mechanism (1) and a sealing mechanism (2), characterized in that: The filtering mechanism (2) is located at the bottom of the switching mechanism (1), and the switching valve body (3) is located on the rear side of the closing mechanism (2). The switching mechanism (1) includes an air regulating component (11), an air control component (12), a switch component (13), an adjustment component (14), and a filtering component (15). The air control component (12) is located on the surface of the air regulating component (11), the switch component (13) is located inside the air control component (12), and the adjustment component (14) is located on the side of the switch component (13). At the bottom, the filter assembly (15) is located at the bottom of the regulating assembly (14). The sealing mechanism (2) includes an indicator assembly (21), a pressure assembly (22), a sealing assembly (23), and a conveying assembly (24). The indicator assembly (21) is located at the bottom of the gas control assembly (12). The pressure assembly (22) is located at the bottom of the indicator assembly (21). The sealing assembly (23) is located inside the pressure assembly (22). The conveying assembly (24) is located at the bottom of the sealing assembly (23).

2. The air switching valve for a diaphragm pump according to claim 1, characterized in that: The gas regulating assembly (11) includes a sealing ring (111), a sealing ring (112), and a regulating valve (113). The sealing ring (112) is bolted to the bottom of the sealing ring (111), and the regulating valve (113) is connected to the front side of the sealing ring (111).

3. The air switching valve for a diaphragm pump according to claim 2, characterized in that: The gas control assembly (12) includes a top gas chamber cover (121), a T-shaped separator (122), and a return spring (123). The top gas chamber cover (121) is bolted to the top of the sealing ring (111), the T-shaped separator (122) is bolted to the bottom of the sealing ring (112), and the return spring (123) is bolted to the bottom of the inner side of the T-shaped separator (122).

4. An air switching valve for a diaphragm pump according to claim 3, characterized in that: The switch assembly (13) includes an upper diaphragm (131), a guide rod (132), and a valve seat (133). The upper diaphragm (131) is bolted to the bottom of the top air chamber cover (121). The bottom of the upper diaphragm (131) is bolted to the top of the closing ring (111). The guide rod (132) is bolted to the bottom of the upper diaphragm (131), and the valve seat (133) is bolted to the bottom of the guide rod (132).

5. An air switching valve for a diaphragm pump according to claim 4, characterized in that: The adjustment assembly (14) includes a lower diaphragm (141), a support plate (142), and a return spring (143). The lower diaphragm (141) is bolted to the bottom of the sealing ring (112), and the bottom of the lower diaphragm (141) is bolted to the top of the T-shaped separator (122). The support plate (142) is bolted to the top of the lower diaphragm (141), and the return spring (143) is bolted to the top of the support plate (142). The top of the return spring (143) contacts the bottom of the upper diaphragm (131).

6. An air switching valve for a diaphragm pump according to claim 5, characterized in that: The filter assembly (15) includes a hollow slide rod (151), a sealing ring (152), and a funnel filter screen (153). The hollow slide rod (151) is bolted to the bottom of the support plate (142), the sealing ring (152) is bolted to the bottom of the hollow slide rod (151), and the funnel filter screen (153) is bolted to the bottom of the hollow slide rod (151). The inner side of the hollow slide rod (151) is in contact with the surface of the guide rod (132), and the inner side of the funnel filter screen (153) is in contact with the surface of the valve seat (133).

7. An air switching valve for a diaphragm pump according to claim 6, characterized in that: The indicator assembly (21) includes a movable tube (211), a glass window (212), and an indicator (213). The movable tube (211) is connected to the bottom of the T-shaped separation cylinder (122). The glass window (212) is fixedly connected to the surface of the movable tube (211). The indicator (213) is bolted to the surface of the guide rod (132). The surface of the indicator (213) passes through the surface of the hollow slide rod (151) and is slidably connected to the hollow slide rod (151).

8. An air switching valve for a diaphragm pump according to claim 7, characterized in that: The pressure assembly (22) includes a pressure pipe (221), a suction valve (222), and a replenishment cover (223). The pressure pipe (221) is connected to the bottom of the movable pipe (211), the suction valve (222) is connected to the surface of the pressure pipe (221), and the replenishment cover (223) is snapped onto the input end of the suction valve (222).

9. An air switching valve for a diaphragm pump according to claim 8, characterized in that: The sealing assembly (23) includes an airbag (231), a sealing ring (232), and a sealing plate (233). The airbag (231) is snapped into the bottom of the inner side of the air pressure pipe (221), the sealing ring (232) is bolted to the bottom of the airbag (231), and the sealing plate (233) is snapped into the top of the airbag (231).

10. An air switching valve for a diaphragm pump according to claim 9, characterized in that: The delivery assembly (24) includes an air inlet pipe (241), a partition plate (242), and a frustum-shaped air inlet (243). The air inlet pipe (241) is connected to the bottom of the air pressure pipe (221), and the top of the air inlet pipe (241) is in contact with the bottom of the airbag (231). The partition plate (242) is welded to the inside of the air inlet pipe (241). The frustum-shaped air inlet (243) is opened on the top of the partition plate (242), and the inside of the frustum-shaped air inlet (243) is in contact with the bottom of the surface of the funnel filter screen (153).

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