Durable air main valve and pneumatic double-diaphragm pump provided with same

Abstract

The utility model provides a durable air main valve and a pneumatic double diaphragm pump equipped with the same, the durable air main valve comprises a valve body, two ends of the valve body are respectively equipped with a left sealing cover and a right sealing cover, the valve body is also equipped with a reversing plate, and the reversing plate is provided with a first working hole, a second working hole and an exhaust hole located between the first working hole and the second working hole; two valve element sleeves and a piston sleeve are installed in the valve body, valve elements are installed in the two valve element sleeves, a piston is arranged at one end of each valve element, a sliding cover is installed on one side of each valve element, and a concave hole is formed in the bottom of each sliding cover. The valve body is further provided with an air connector, a first communicating hole and a second communicating hole. A communicating groove is further formed in the valve element. The air main valve is provided with the piston sleeve, the friction coefficient between the piston and the valve body is reduced, the abrasion and damage probability of the sealing ring of the sliding seal is reduced, and therefore the probability that the working efficiency is reduced and faults occur due to the abrasion and damage of the sealing ring of the sliding seal of the air main valve is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic double diaphragm pumps, and particularly relates to a durable air main valve and a pneumatic double diaphragm pump equipped with the air main valve. Background Technology

[0002] The pneumatic dual diaphragm pump is a new type of conveying machinery and a relatively novel type of pump. Using compressed gas as its power source, it can completely pump out various corrosive liquids, liquids containing particles, and high-viscosity, volatile, flammable, and highly toxic liquids. The working principle of the pneumatic dual diaphragm pump is as follows: the two air chambers of the diaphragm pump are continuously and alternately filled and discharged with compressed air, which drives the two liquid chambers of the diaphragm pump to alternately draw in and discharge liquid, thus achieving continuous pumping and conveying of liquid. The alternating filling and discharging of compressed air into the two air chambers of the diaphragm pump is achieved through the main air valve of the diaphragm pump.

[0003] The air main valve of current pneumatic dual diaphragm pumps primarily relies on the reciprocating motion (reversing motion) of the valve core to alternately fill and discharge compressed air into the two air chambers of the diaphragm pump. This, in turn, enables the diaphragm to continuously reciprocate, resulting in the continuous alternating intake and discharge of liquid into the two liquid chambers. Currently, the air main valve of pneumatic dual diaphragm pumps often contains several sliding seals. A large number of sliding seals increases the probability of wear and damage. Wear and damage to these seals can lead to air leakage and malfunction of the air main valve. Air leakage reduces operating efficiency, while malfunction can cause the pneumatic dual diaphragm pump to stop operating, resulting in losses due to production stoppage.

[0004] The utility model application with application number 202221252370.0 proposes an air main valve. Through structural improvements, it requires only two sliding sealing rings, reducing the product's failure rate. However, due to the direct contact and friction between the piston and the valve body, the coefficient of friction is relatively large, affecting the operating speed. At the same time, the sealing rings on the piston will be damaged due to long-term friction, shortening the service life of the entire air main valve. In addition, the left cover on the left end of the valve body and the right cover on the right end of the valve body are installed in the valve body through holes using retaining rings, making assembly relatively complex. Utility Model Content

[0005] This invention addresses the technical problem of wear and malfunction caused by direct contact and friction between the piston and valve body of the air main valve in existing pneumatic dual diaphragm pumps. It proposes a durable air main valve that reduces the friction coefficient through a piston sleeve and is easy to assemble, as well as a pneumatic dual diaphragm pump equipped with the air main valve.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A durable air main valve includes a valve body, with a left cover and a right cover installed at both ends of the valve body, and a reversing plate installed on the valve body. The reversing plate is provided with a first working hole, a second working hole and an exhaust hole located between the two.

[0008] The valve body is equipped with two valve core sleeves and one piston sleeve. The two valve core sleeves are equipped with valve cores that slide left and right. One end of the valve core is equipped with a piston that slides along the piston sleeve. A sliding cover is installed on one side of the valve core that moves with the valve core and contacts the plane of the reversing plate. A concave hole is provided at the bottom of the sliding cover. When the sliding cover moves left and right, the two working holes are alternately connected to the exhaust hole through the concave hole.

[0009] The valve body is also provided with an air interface for connecting compressed air, a first connecting hole for connecting reversing signal air, and a second connecting hole for connecting the chamber between the piston and the right valve core sleeve; the valve core is also provided with an air interface and a connecting groove for the space between the valve core and the left cover; sealing rings are installed between the valve core and the second valve core sleeve, and between the piston and the valve body.

[0010] Preferably, a V-shaped notch is provided on one side of the sealing ring.

[0011] Preferably, the sliding cover and the reversing plate are made of ceramic material.

[0012] Preferably, a sealing ring is provided between the left and right cover and the valve body.

[0013] Preferably, the piston and valve core are separate structures.

[0014] Preferably, the piston sleeve is located between the right valve core sleeve and the right cover and presses against the right valve core sleeve.

[0015] Preferably, the left and right covers are mounted on both ends of the valve body by screws.

[0016] Preferably, the piston sleeve is made of POM, ceramic, or polytetrafluoroethylene.

[0017] This utility model also proposes a pneumatic dual-diaphragm pump, including a housing and the aforementioned durable air main valve. The housing is provided with a pump inlet, a pump outlet, and a main exhaust port. Inside the housing are a left liquid chamber, a right liquid chamber, a left air chamber, and a right air chamber. A left diaphragm is disposed between the left liquid chamber and the left air chamber, and a right diaphragm is disposed between the right liquid chamber and the right air chamber. The first working port of the air main valve is connected to the left air chamber, the second working port is connected to the right air chamber, and the exhaust port and the second connecting port are connected to the pump's main exhaust port. Compared with the prior art, the advantages and positive effects of this utility model are:

[0018] 1. The left and right covers of the durable air main valve are fixed to the valve body with screws. Compared with the existing technology of setting a limiting groove on the inner wall of the valve body and using a retaining ring to fix the left and right covers in the limiting groove, the screw fixing installation is simple and reduces the assembly difficulty of the air main valve.

[0019] 2. The durable air main valve has a piston sleeve installed on the inner wall of the valve body within the piston's range of motion. This piston sleeve is made of a material with a low coefficient of friction, which reduces the wear of the second sealing ring, improves the life of the second sealing ring, and reduces the maintenance rate of the air main valve.

[0020] 3. The piston sleeve is located between the second valve core sleeve and the right cover, which plays a role in restricting the position of the second valve core sleeve. Compared with the existing technology that uses a retaining ring to fix the position, it reduces the number of parts and makes assembly simpler. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the pneumatic double diaphragm pump of this utility model;

[0022] Figure 2 This is a cross-sectional view of the pneumatic double diaphragm pump of this utility model;

[0023] Figure 3 This is a cross-sectional view of the durable air main valve of this utility model;

[0024] In the above figures, 1-valve body; 2-left cover; 3-right cover; 4-first valve core sleeve; 5-second valve core sleeve; 6-valve core; 7-piston; 8-sliding cover; 9-reversing plate; 10-first sealing ring; 11-second sealing ring; 12-piston sleeve;

[0025] 101-First chamber; 102-Second chamber; 103-Third chamber; 104-Fourth chamber; 105-First working hole; 106-Exhaust hole; 107-Second working hole; 108-First connecting hole; 109-Second connecting hole; 110-Connecting groove; 111-Concave hole; 201-Pump inlet; 202-Left liquid chamber; 203-Left air chamber; 204-Left diaphragm; 205-Pump outlet; 206-Right air chamber; 207-Right diaphragm; 208-Right liquid chamber; 209-Air main valve; 210-Outer shell. Detailed Implementation

[0026] To better understand this utility model, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0027] Example: Figure 1 and Figure 2As shown, a pneumatic dual-diaphragm pump includes a housing 210 and an air main valve 209. The housing 210 is provided with a pump inlet 201, a pump outlet 205 and a main exhaust port. The housing 210 is provided with a left liquid chamber 202, a left air chamber 203, a right liquid chamber 208 and a right air chamber 206. A left diaphragm 204 is provided between the left liquid chamber 202 and the left air chamber 203, and a right diaphragm 207 is provided between the right liquid chamber 208 and the right air chamber 206.

[0028] like Figure 3 As shown, the air main valve 209 includes a valve body 1, a left cover 2 installed at the left end of the valve body 1, a right cover 3 installed at the right end of the valve body 1, and a reversing plate 9 installed on the valve body 1. The reversing plate 9 is provided with a first working hole 105, a second working hole 107, and an exhaust hole 106 located between the two. The left cover 2 and the right cover 3 are fixed to the valve body 1 with screws. Compared with the prior art, which uses a limiting groove in the valve body 1 and a retaining ring installed in the limiting groove to fix the left cover 2 and the right cover 3, the screw fixing installation is simple and reduces the assembly difficulty of the air main valve.

[0029] The valve body 1 contains a first valve core sleeve 4 and a second valve core sleeve 5 fixed to the valve body 1, and a valve core 6 that can move left and right within the first valve core sleeve 4 and the second valve core sleeve 5. A piston 7 is provided at the right end of the valve core 6. The valve core and the piston can be separate structures or integrated structures. This embodiment adopts a separate structure, which simplifies the manufacturing process. A piston sleeve 12 is installed on the inner wall of the valve body 1 in the area within the range of motion of the piston 7, and a second sealing ring 11 is installed on the piston 7. The piston sleeve 12 is made of a material with a low coefficient of friction, such as POM, ceramic, or polytetrafluoroethylene. This embodiment uses POM material. Due to the low coefficient of friction of the piston sleeve 12, the wear of the second sealing ring 11 is reduced, the life of the second sealing ring 11 is increased, and the maintenance rate of the air main valve 209 is reduced. The piston sleeve 12 is located between the second valve core sleeve 5 and the right cover 3, which restricts the position of the second valve core sleeve 5. Compared with the prior art of fixing the position of the second valve core sleeve 5 with a retaining ring in the mounting hole in the limiting groove, this reduces the number of parts and simplifies the processing and assembly.

[0030] A sliding cover 8 is also installed on the valve core 6, which moves together with the valve core 6. The sliding cover 8 always maintains planar contact with the reversing plate 9. A recessed hole 111 is provided at the bottom of the sliding cover 8. When the sliding cover 8 moves left and right, the recessed hole covers the exhaust hole 106 and one of the working holes.

[0031] The valve core 6 and piston 7 form a total of four chambers with the valve body 1, namely the first chamber 101, which is surrounded by the left cover 2, the inner hole of the first valve core sleeve 4 and the left side of the valve core 6; the second chamber 102, which is surrounded by the valve body 1, the reversing plate 9, the first valve core sleeve 4 and the second valve core sleeve 5; the third chamber 103, which is surrounded by the left side wall of the piston 7, the valve body 1, the second valve core sleeve 5 and the right end of the valve core 6; and the fourth chamber 104, which is surrounded by the right side wall of the piston 7, the valve body 1 and the right cover 3.

[0032] The valve body 1 is also provided with an air interface, a first connecting hole 108, and a second connecting hole 109. The air interface is connected to compressed air, and the second chamber 102 is connected to a compressed air source through the air interface 112 on the valve body 1. The valve core 6 is provided with a connecting groove 110, which connects the first chamber 101 and the second chamber 102. Therefore, the first chamber is also connected to the compressed air source, and the compressed air in the first chamber 101 always exerts a rightward thrust on the valve core 6.

[0033] The fourth chamber 104 is located to the right of the piston 7. This chamber is connected to the output port of the air pilot valve of the pneumatic dual diaphragm pump via a pre-drilled hole on the piston sleeve and a first connecting hole 108. As the air pilot valve of the pneumatic dual diaphragm pump reverses direction, the air pilot valve continuously and alternately fills and discharges compressed air into the connected fourth chamber 104, thereby realizing the continuous reciprocating reversing action of the air main valve core 6. The third chamber 103 is connected to the main exhaust port of the pneumatic dual diaphragm pump via a second connecting hole 109, therefore the pressure in the third chamber 103 is zero (gauge pressure).

[0034] In this embodiment, the reversing plate 9 is sequentially provided with a first working hole 105, an exhaust hole 106, and a second working hole 107. The first working hole 105 and the second working hole 107 are respectively connected to the left and right air chambers 203 and 206 of the pneumatic double diaphragm pump. When the first working hole 105 fills the left air chamber 203 of the pneumatic double diaphragm pump with compressed air, the second working hole 107 exhausts the compressed air in the right air chamber 206 of the pneumatic double diaphragm pump. Therefore, under the pressure difference between the left and right air chambers of the pneumatic double diaphragm pump, the diaphragm is pushed to the left. Conversely, when the second working hole 107 fills the right air chamber 206 of the pneumatic double diaphragm pump with compressed air, the first working hole 105 exhausts the compressed air in the left air chamber 203 of the pneumatic double diaphragm pump. Therefore, under the pressure difference between the left and right air chambers of the pneumatic double diaphragm pump, the diaphragm is pushed to the right. Thus, the first working hole 105 and the second working hole 107 alternately and cyclically fill / discharge compressed air into the left and right air chambers of the pneumatic diaphragm pump that are connected thereto, thereby driving the diaphragm of the diaphragm pump to reciprocate back and forth; the exhaust hole 106 is connected to the main exhaust port of the pneumatic dual diaphragm pump.

[0035] In this embodiment, the air pilot valve of the diaphragm pump through the first connecting hole 108 alternately and cyclically fills / discharges compressed air into the connected fourth chamber 104, i.e., sends a reversing signal; the valve body 1 is also provided with a second connecting hole 109, which connects the third chamber 103 to the total exhaust port of the pneumatic dual diaphragm pump, so the air pressure in the third chamber 103 is always zero (gauge pressure).

[0036] In this embodiment, the sliding cover 8 and the reversing plate 9 are made of ceramic material and always maintain close contact. Under the drive of the valve core 6, the sliding cover 8 reciprocates on the reversing plate 9, forming a planar sliding seal between the two. This structure has advantages such as wear resistance, self-lubrication, dirt resistance and anti-fouling, suitability for harsh working air source environments, and no need for periodic lubrication.

[0037] In this embodiment, a first sealing ring 10 is installed between the valve core 6 and the second valve core sleeve. Both the first sealing ring 10 and the second sealing ring 11 have a V-shaped notch on one side. The sealing ring has wear self-compensation performance and good sealing effect.

[0038] In summary, the air main valve described in this embodiment is equipped with a piston sleeve, which reduces the friction coefficient between the piston and the valve body, and reduces the probability of wear and damage to the sliding seal ring. This reduces the likelihood of reduced efficiency and malfunctions in the air main valve due to wear and damage to the sliding seal ring. The piston sleeve also serves to fix the second valve core sleeve. Furthermore, the left and right covers are fixed to the valve body with screws instead of using retaining rings, reducing the difficulty of assembling the air main valve and simplifying subsequent maintenance by the user. Pneumatic dual-diaphragm pumps equipped with this air main valve have a long service life, low failure rate, and can operate for extended periods in harsh environments.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present invention.

Claims

1. A durable air main valve, comprising a valve body, characterized in that: The valve body is equipped with a left cover and a right cover at both ends, and a reversing plate is also installed on the valve body. The reversing plate is provided with a first working hole, a second working hole and an exhaust hole located between the two. The valve body is equipped with two valve core sleeves and one piston sleeve. The two valve core sleeves are equipped with valve cores that slide left and right. One end of the valve core is equipped with a piston that slides along the piston sleeve. A sliding cover is installed on one side of the valve core that moves with the valve core and contacts the plane of the reversing plate. A concave hole is provided at the bottom of the sliding cover. When the sliding cover moves left and right, the two working holes are alternately connected to the exhaust hole through the concave hole. The valve body is also provided with an air interface, a first connecting hole, and a second connecting hole connecting the chamber between the piston and the right valve core sleeve; the valve core is also provided with a connecting groove connecting the air interface and the space between the valve core and the left cover; sealing rings are installed between the valve core and the second valve core sleeve, and between the piston and the valve body.

2. The air main valve according to claim 1, characterized in that: A V-shaped notch is provided on one side of the sealing ring.

3. The durable air main valve according to claim 1, characterized in that: The sliding cover and reversing plate are made of ceramic.

4. The durable air main valve according to claim 1, characterized in that: A sealing ring is provided between the left and right cover and the valve body.

5. The durable air main valve according to claim 1, characterized in that: The piston and valve core are separate components.

6. The durable air main valve according to claim 1, characterized in that: The piston sleeve is located between the right valve core sleeve and the right cover and presses the right valve core sleeve tightly.

7. The durable air main valve according to claim 1, characterized in that: The left and right covers are installed at both ends of the valve body by screws.

8. The durable air main valve according to claim 1, characterized in that: The piston sleeve is made of POM, ceramic, or polytetrafluoroethylene.

9. A pneumatic double diaphragm pump, characterized in that: The device includes a housing and a durable air main valve as described in any one of claims 1-8. The housing is provided with a pump inlet, a pump outlet, and a main exhaust port. Inside the housing are a left liquid chamber, a right liquid chamber, a left air chamber, and a right air chamber. A left diaphragm is provided between the left liquid chamber and the left air chamber, and a right diaphragm is provided between the right liquid chamber and the right air chamber. The first working port of the air main valve is connected to the left air chamber, the second working port is connected to the right air chamber, and the exhaust port and the second connecting port are connected to the main exhaust port of the pump.

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