Pneumatic metering pump

Abstract

According to the pneumatic constant delivery pump, airflow enters the air exchange cavity through the air inlet to push the air exchange assembly to move in a reciprocating mode, the air exchange assembly changes the direction of the airflow entering the pump cavity through reciprocating movement to push the piston assembly to move in a reciprocating mode, and the piston assembly drives the pump rod assembly to extract fluid through reciprocating movement. A magnetic induction circuit board is arranged on the pump shell, and a magnetic sensor is arranged on the end face, close to the magnetic induction circuit board, of the piston assembly. High-pressure air is adopted as a power source to drive the piston assembly to reciprocate, meanwhile, the magnetic block is installed on the piston assembly and matched with the magnetic induction circuit board, the reciprocating motion frequency of the piston assembly is calculated, accurate quantitative calculation is carried out with the metering volume unit, accurate control over the whole motion process is achieved, and therefore the accuracy of quantitative conveying is improved.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic pump technology, and in particular to a pneumatic metering pump. Background Technology

[0002] In production, precise oil delivery helps maintain the normal operation of equipment. In hydraulic systems, uneven or excessive oil delivery can lead to unstable system pressure and potentially cause equipment failure. A fixed-displacement pump can control the amount of oil delivered, avoiding the adverse consequences of too much or too little oil and protecting the safe operation of the equipment.

[0003] In existing technologies, pneumatic pumps deliver liquid in a metering manner by using compressed air to drive a piston. By precisely controlling the air pressure, the pump's output flow rate can be controlled. Higher air pressure increases the piston's movement speed, thereby increasing the liquid delivery volume. Conversely, lower air pressure slows the movement speed and reduces the flow rate. Since the metering delivery of these pneumatic pumps relies on compressed air, unstable air pressure can lead to uneven or fluctuating delivery volumes. Such fluctuations can affect the accuracy of metering, especially in applications with strict requirements for delivery volume. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a pneumatic metering pump, which aims to solve the problem that the metering delivery of existing pneumatic pumps depends on compressed air. If the pressure of the air source is unstable, it may lead to uneven delivery or fluctuations, which may affect the accuracy of metering delivery.

[0005] This utility model provides a pneumatic metering pump, including a pump housing, a piston assembly, a venting assembly, and a pump rod assembly. The pump housing has a venting chamber and a pump chamber, which are interconnected. The piston assembly is movably disposed in the pump chamber, and the venting assembly is movably disposed in the venting chamber. The venting chamber has an inlet and an outlet. The inlet allows airflow to enter the venting chamber and drive the venting assembly to reciprocate. The venting assembly is used to change the direction of the airflow entering the pump chamber through reciprocating movement, thereby driving the piston assembly to reciprocate. The piston assembly is used to drive the pump rod assembly to extract fluid through reciprocating movement. A magnetic circuit board is provided on the pump housing, and a magnetometer is provided on the end face of the piston assembly near the magnetic circuit board.

[0006] In some embodiments of this utility model, the piston assembly includes an upper piston cover, a lower piston cover, and a piston rod. The upper piston cover and the lower piston cover are both connected to one end of the piston rod, and the other end of the piston rod is connected to the pump rod assembly. The magnetic sensor is disposed on the upper piston.

[0007] In some embodiments of this utility model, the piston rod includes a first connecting segment and a second connecting segment connected to each other. The diameter of the first connecting segment is smaller than the diameter of the second connecting segment. A limiting step is formed at the connection between the first connecting segment and the second connecting segment. A thread is formed at the end of the first connecting segment. The end of the second connecting segment is connected to the pump rod assembly. One side of the lower piston cover abuts against the limiting step, and the other side abuts against the upper piston cover. The end of the first connecting segment is threadedly connected to a bolt to fix the upper piston cover and the lower piston cover.

[0008] In some embodiments of this utility model, a gasket is provided between the upper piston cover and the lower piston cover.

[0009] In some embodiments of this utility model, sealing rings are provided on the outer periphery of both the upper piston cover and the lower piston cover, and the sealing rings abut against the inner wall of the pump chamber.

[0010] In some embodiments of this utility model, the edges of the upper piston cover and the lower piston cover are chamfered.

[0011] In some embodiments of this utility model, the pump rod assembly includes a plunger, a lifting rod, a connecting pipe, a first steel ball, a second steel ball, a third steel ball, and a lifting plug. The connecting pipe is connected to the pump housing and has a hollow structure. An oil seal is provided inside the connecting pipe, which divides the connecting pipe into a primary pressurizing chamber and a secondary pressurizing chamber. The plunger is housed in the secondary pressurizing chamber, and the lifting rod is housed in the primary pressurizing chamber. One end of the plunger is connected to the piston assembly, and the other end passes through the oil seal and is connected to the lifting rod. The other end of the lifting rod extends to the outside of the primary pressurizing chamber and is connected to the lifting plug. The lifting rod has a primary oil inlet channel, and the plunger has a secondary oil inlet channel. The first steel ball is movably disposed on one end of the primary oil inlet channel, and an oil inlet hole is provided at the other end of the primary oil inlet channel. The second and third steel balls are movably disposed on both ends of the secondary oil inlet channel. The diameter of the plunger is larger than the diameter of the lifting rod.

[0012] In some embodiments of this utility model, the end of the connecting pipe is connected to a filter sleeve, and an oil inlet hole is provided on the periphery of the filter sleeve.

[0013] In some embodiments of this utility model, a silencer box is provided on the peripheral side of the pump housing, and the interior of the silencer box is in communication with the air outlet.

[0014] In some embodiments of this utility model, the ventilation chamber is provided with two anti-collision pads, which are used to abut against the ventilation assembly when the ventilation assembly reciprocates.

[0015] Beneficial Effects: This utility model provides a pneumatic metering pump. Airflow enters the ventilation chamber through the air inlet, driving a ventilation assembly to reciprocate. This reciprocating movement of the ventilation assembly changes the direction of the airflow entering the pump chamber, thus driving a piston assembly to reciprocate. The piston assembly, through this reciprocating movement, drives a pump rod assembly to extract fluid. A magnetic circuit board is mounted on the pump housing, and a magnetic sensor is located on the end face of the piston assembly near the magnetic circuit board. This application uses high-pressure air as a power source to drive the piston assembly to reciprocate. Simultaneously, a magnetic block is installed on the piston assembly, working in conjunction with the magnetic circuit board to calculate the number of reciprocating movements of the piston assembly. Precise quantitative calculations are then performed using volumetric units, achieving precise control of the entire movement process and improving the accuracy of quantitative delivery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the pneumatic metering pump of this utility model;

[0018] Figure 2 This is a schematic diagram of the pneumatic metering pump of this utility model from another perspective (excluding the silencer box).

[0019] Figure 3 This is a schematic diagram of the internal structure of the pump casing;

[0020] Figure 4 This is a schematic diagram of the internal structure of the pump rod assembly;

[0021] Figure 5 This is a schematic diagram of the piston rod.

[0022] In the diagram: 1. Pump housing; 11. Ventilation chamber; 111. Air inlet; 112. Air outlet; 113. Anti-collision pad; 12. Pump chamber; 2. Piston assembly; 21. Upper piston cover; 22. Lower piston cover; 23. Piston rod; 231. First connecting section; 232. Second connecting section; 233. Limiting step; 234. Bolt; 24. Gasket; 25. Sealing ring; 3. Ventilation assembly; 4. Pump rod assembly; 41. Column 411. Secondary oil inlet channel; 42. Oil lifting rod; 421. Primary oil inlet channel; 43. Connecting pipe; 431. Oil seal; 432. Primary pressurizing chamber; 433. Secondary pressurizing chamber; 434. Oil seal; 44. First steel ball; 45. Second steel ball; 46. Third steel ball; 47. Oil lifting plug; 5. Magnetic circuit board; 6. Magnetic sensor; 7. Filter sleeve; 71. Oil inlet hole; 8. Silencer box; 9. Oil outlet hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1 to 5 This utility model provides a pneumatic metering pump, including a pump housing 1, a piston assembly 2, a ventilation assembly 3, and a pump rod assembly 4. The pump housing 1 has a ventilation chamber 11 and a pump chamber 12, which are interconnected. The piston assembly 2 is movably disposed in the pump chamber 12, and the ventilation assembly 3 is movably disposed in the ventilation chamber 11. The ventilation chamber 11 has an air inlet 111 and an air outlet 112. The air inlet 111 allows airflow to enter the ventilation chamber 11 and drive the ventilation assembly 3 to reciprocate. The ventilation assembly 3 is used to change the direction of the airflow entering the pump chamber 12 by reciprocating to drive the piston assembly 2 to reciprocate. The piston assembly 2 is used to drive the pump rod assembly 4 to extract fluid by reciprocating. The pump housing 1 is provided with a magnetic circuit board 5, and the piston assembly 2 is provided with a magnetometer 6 on the end face near the magnetic circuit board 5.

[0025] The quantitative control method described in this application can be integrated with a PLC (Programmable Logic Controller) automated control system to achieve precise quantitative control. The PLC system controls the start and stop of the pneumatic pump by inputting the set liquid delivery volume and time, and monitors the liquid flow rate in real time through the magnetic induction circuit board 5 to ensure that the delivery volume accurately meets the requirements.

[0026] In some embodiments of this utility model, the piston assembly 2 includes an upper piston cover 21, a lower piston cover 22, and a piston rod 23. Both the upper piston cover 21 and the lower piston cover 22 are connected to one end of the piston rod 23, and the other end of the piston rod 23 is connected to the pump rod assembly 4. The magnetic sensor 6 is disposed on the upper piston. In this embodiment, the upper piston cover 21 and the lower piston cover 22 are manufactured separately, allowing for precise fitting during assembly as needed, ensuring optimal contact and sealing between components. Separate manufacturing makes adjustments and modifications easier during assembly. Furthermore, during assembly, workers can adjust the gaskets 24 and sealing rings 25 between the upper piston cover 21 and the lower piston cover 22 as needed to ensure assembly accuracy. During maintenance or replacement, the upper piston cover 21 or the lower piston cover 22 can be replaced individually without replacing all components, providing greater flexibility and economy for equipment maintenance.

[0027] In some embodiments of this utility model, the piston rod 23 includes a first connecting segment 231 and a second connecting segment 232 connected to each other. The diameter of the first connecting segment 231 is smaller than the diameter of the second connecting segment 232. A limiting step 233 is formed at the connection between the first connecting segment 231 and the second connecting segment 232. A thread is formed at the end of the first connecting segment 231. The end of the second connecting segment 232 is connected to the pump rod assembly 4. One side of the lower piston cover 22 abuts against the limiting step 233, and the other side abuts against the upper piston cover 21. The end of the first connecting segment 231 is threadedly connected to a bolt 234 to fix the upper piston cover 21 and the lower piston cover 22.

[0028] In some embodiments of this utility model, a gasket 24 is provided between the upper piston cover 21 and the lower piston cover 22. In actual production, there will always be certain dimensional and geometric tolerances (such as flatness and parallelism) in the machining of the upper piston cover 21 and the lower piston cover 22. The gasket 24 is compressible and can absorb these small dimensional deviations and minor misalignments that may occur during assembly, ensuring that the upper piston cover 21 and the lower piston cover 22 can fit tightly together, achieving the expected sealing effect and structural stability.

[0029] In some embodiments of this invention, sealing rings 25 are provided on the outer periphery of both the upper piston cover 21 and the lower piston cover 22, and the sealing rings 25 abut against the inner wall of the pump chamber 12. In this embodiment, the sealing performance can be improved by using the sealing rings 25 to prevent gas leakage from affecting the performance of the pneumatic pump.

[0030] In some embodiments of this invention, the edges of the upper piston cover 21 and the lower piston cover 22 are chamfered. Specifically, gas entering the pump chamber 12 pushes the piston cover to move. When the edges of the piston cover are not chamfered, the sharp corners may obstruct fluid flow, forming eddies or uneven flow. Chamfering smooths the edges, making gas flow smoother, reducing airflow disturbance, and improving the movement efficiency of the piston cover.

[0031] In some embodiments of this utility model, the pump rod assembly 4 includes a plunger 41, a lifting rod 42, a connecting pipe 43, a first steel ball 44, a second steel ball 45, a third steel ball 46, and a lifting plug 47. The connecting pipe 43 is connected to the pump housing 1 and has a hollow structure. An oil seal 434431 is provided inside the connecting pipe 43, dividing the connecting pipe 43 into a primary pressurizing chamber 432 and a secondary pressurizing chamber 433. The plunger 41 is housed in the secondary pressurizing chamber 433, and the lifting rod 42 is housed in the primary pressurizing chamber 432. One end of the plunger 41 is connected to the piston assembly 2, and the other end... One end of the piston rod 42 passes through the oil seal 434431 and connects to the oil lifting rod 42. The other end of the oil lifting rod 42 extends to the outside of the primary pressure chamber 432 and connects to the oil lifting plug 47. The oil lifting rod 42 has a primary oil inlet channel 421, and the plunger 41 has a secondary oil inlet channel 411. The first steel ball 44 is movably disposed on one end of the primary oil inlet channel 421, and the other end of the primary oil inlet channel 421 has an oil inlet hole 71. The second steel ball 45 and the third steel ball 46 are movably disposed on both ends of the secondary oil inlet channel 411. The diameter of the plunger 41 is larger than the diameter of the oil lifting rod 42. In this embodiment, when the piston assembly 2 drives the plunger 41 and the oil lifting rod 42 to move simultaneously, there will be a change in the volume ratio in the primary pressure chamber 432 and the secondary pressure chamber 433, thereby extracting oil. During this process, the first steel ball 44, the second steel ball 45, and the third steel ball 46 cooperate with each other to control the opening and closing of the primary oil inlet channel 421 and the secondary oil inlet channel 411, ensuring the unidirectional flow of oil and guaranteeing the normal and efficient operation of the pneumatic pump.

[0032] In some embodiments of this utility model, the end of the connecting pipe 43 is connected to the filter sleeve 7, and the filter sleeve 7 has an oil inlet hole 71 on its circumference. In addition, the other end of the connecting pipe 43 is connected to the oil outlet hole 9.

[0033] In some embodiments of this utility model, a silencer box 8 is provided on the peripheral side of the pump casing 1, and the interior of the silencer box 8 is connected to the air outlet 112. In this embodiment, the silencer box 8 reduces the noise generated when the air outlet 112 discharges gas, avoiding the impact of high noise on operators and the environment, and plays a noise reduction role by absorbing and dissipating sound waves in the airflow.

[0034] In some embodiments of this utility model, the ventilation chamber 11 is provided with two anti-collision pads 113, which are used to abut against the ventilation assembly 3 when the ventilation assembly 3 reciprocates.

[0035] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic metering pump, characterized in that: The system includes a pump housing (1), a piston assembly (2), a ventilation assembly (3), and a pump rod assembly (4). The pump housing (1) has a ventilation chamber (11) and a pump chamber (12) connected to each other. The piston assembly (2) is movably disposed within the pump chamber (12), and the ventilation assembly (3) is movably disposed within the ventilation chamber (11). The ventilation chamber (11) has an air inlet (111) and an air outlet (112). An airflow can enter the ventilation chamber (11) to drive the ventilation assembly (3) to reciprocate. The ventilation assembly (3) is used to change the direction of the airflow entering the pump chamber (12) by reciprocating to drive the piston assembly (2) to reciprocate. The piston assembly (2) is used to drive the pump rod assembly (4) to draw fluid by reciprocating. A magnetic circuit board (5) is provided on the pump housing (1). A magnetic sensor (6) is provided on the end face of the piston assembly (2) near the magnetic circuit board (5).

2. The pneumatic metering pump according to claim 1, characterized in that: The piston assembly (2) includes an upper piston cover (21), a lower piston cover (22) and a piston rod (23). The upper piston cover (21) and the lower piston cover (22) are both connected to one end of the piston rod (23). The other end of the piston rod (23) is connected to the pump rod assembly (4). The magnetometer (6) is located on the upper piston.

3. The pneumatic metering pump according to claim 2, characterized in that: The piston rod (23) includes a first connecting section (231) and a second connecting section (232) connected to each other. The diameter of the first connecting section (231) is smaller than the diameter of the second connecting section (232). A limiting step (233) is formed at the connection between the first connecting section (231) and the second connecting section (232). The end of the first connecting section (231) is threaded. The end of the second connecting section (232) is connected to the pump rod assembly (4). One side of the lower piston cover (22) abuts against the limiting step (233), and the other side abuts against the upper piston cover (21). The end of the first connecting section (231) is threadedly connected to a bolt (234) to fix the upper piston cover (21) and the lower piston cover (22).

4. The pneumatic metering pump according to claim 2, characterized in that: A gasket (24) is provided between the upper piston cover (21) and the lower piston cover (22).

5. The pneumatic metering pump according to claim 2, characterized in that: Both the upper piston cover (21) and the lower piston cover (22) are provided with sealing rings (25) on their outer periphery, and the sealing rings (25) abut against the inner wall of the pump chamber (12).

6. The pneumatic metering pump according to claim 2, characterized in that: The edges of the upper piston cover (21) and the lower piston cover (22) are chamfered.

7. The pneumatic metering pump according to claim 1, characterized in that: The pump rod assembly (4) includes a plunger (41), a lifting rod (42), a connecting pipe (43), a first steel ball (44), a second steel ball (45), a third steel ball (46), and a lifting plug (47). The connecting pipe (43) is connected to the pump housing (1) and has a hollow structure. The connecting pipe (43) is equipped with an oil seal (434)(431) inside. The oil seal (434)(431) divides the connecting pipe (43) into a primary pressurizing chamber (432) and a secondary pressurizing chamber (433). The plunger (41) is housed in the secondary pressurizing chamber (433), and the lifting rod (42) is housed in the primary pressurizing chamber (432). One end of the plunger (41) is connected to the piston assembly (2), and the other end passes through... The oil seal (434) and the oil lifting rod (42) are connected through the oil seal (434) and (431). The other end of the oil lifting rod (42) extends to the outside of the first-stage pressurization chamber (432) and is connected to the oil lifting plug (47). The oil lifting rod (42) has a first-stage oil inlet channel (421), and the plunger (41) has a second-stage oil inlet channel (411). The first steel ball (44) is movably disposed on one end of the first-stage oil inlet channel (421), and the other end of the first-stage oil inlet channel (421) has an oil inlet hole (71). The second steel ball (45) and the third steel ball (46) are movably disposed on both ends of the second-stage oil inlet channel (411). The diameter of the plunger (41) is larger than the diameter of the oil lifting rod (42).

8. The pneumatic metering pump according to claim 7, characterized in that: The end of the connecting pipe (43) is connected to the filter sleeve (7), and the filter sleeve (7) has an oil inlet hole (71) on its periphery.

9. The pneumatic metering pump according to claim 1, characterized in that: A silencer box (8) is provided on the peripheral side of the pump casing (1), and the interior of the silencer box (8) is connected to the air outlet (112).

10. The pneumatic metering pump according to claim 1, characterized in that: The ventilation chamber (11) is provided with two anti-collision pads (113), which are used to abut against the ventilation assembly (3) when the ventilation assembly (3) moves back and forth.

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