Electric diaphragm pump

Abstract

The utility model relates to the technical fields of diaphragm pump, more specifically, relate to a kind of electric diaphragm pump, including power component, transmission component and pump body component, the power component is connected with the transmission component, the pump body component includes piston and diaphragm, the transmission component is connected with the piston and drives the reciprocating motion of the piston, pull bolt connected with the diaphragm is provided on the piston, the diaphragm both sides are respectively provided with the air inlet cavity and medium cavity in the pump body component, stepless pressure regulating device is provided in the air inlet cavity.The utility model realizes high stability and high-precision flow stepless regulation, so that flow output is more stable, can satisfy higher precision fluid delivery and control demand.

Description

Technical Field

[0001] This utility model relates to the technical field of diaphragm pumps, and more specifically, to an electric diaphragm pump. Background Technology

[0002] An electric diaphragm pump is a positive displacement pump that relies on an electric motor to drive the diaphragm to reciprocate to achieve fluid transport. During operation, the diaphragm's periodic deformation completes the intake and discharge of the medium. It has outstanding advantages such as strong self-priming ability, good corrosion resistance, and suitability for transporting media containing solid particles. Therefore, it is widely used in many industrial fields such as chemical industry, food processing, and environmental water treatment.

[0003] In existing technologies, electric diaphragm pumps are mainly divided into two categories: one is designed for fixed flow rates, which can only transport fluid according to preset parameters and cannot be adjusted according to actual working conditions; the other uses a variable frequency motor, where the frequency converter adjusts the motor's operating frequency to change the reciprocating speed of the diaphragm, thereby achieving stepless flow regulation. However, this type of variable frequency motor adjustment scheme relies on changes in motor speed. When low flow output is required, the motor needs to maintain a low speed, which can easily lead to insufficient output torque, causing instability in the diaphragm's motion cycle, resulting in increased flow fluctuations and large accuracy deviations under certain working conditions, making it difficult to meet the requirements of high-precision fluid transportation. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies that use variable frequency motors for flow regulation, which result in large flow fluctuations. This invention provides an electric diaphragm pump that achieves stepless flow regulation with high stability and high precision, making the flow output more stable and meeting the needs of higher precision fluid transportation and control.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An electric diaphragm pump is provided, including a power component, a transmission component, and a pump body assembly. The power component is connected to the transmission component. The pump body assembly includes a piston and a diaphragm. The transmission component is connected to the piston and drives the piston to reciprocate. A pull bolt connected to the diaphragm is provided on the piston. An air inlet chamber and a medium chamber are respectively provided on both sides of the diaphragm within the pump body assembly. A stepless pressure regulating device is provided in the air inlet chamber.

[0006] This invention relates to an electric diaphragm pump. A power assembly provides constant power, which is transmitted through a transmission assembly to drive a piston in reciprocating motion within the pump body assembly. The piston, via a connected bolt, moves the diaphragm, thus completing the transport of the medium in the media chamber. When flow rate adjustment is required, the air pressure in the inlet chamber can be continuously adjusted by operating a stepless pressure regulating device located in the inlet chamber. This air pressure acts on the diaphragm, changing the relative position of the diaphragm and the bolt's fixing point with respect to the piston, thereby achieving continuous and smooth stepless adjustment of the medium flow rate. When the pressure in the inlet chamber increases, the offset of the diaphragm and bolt's fixing point relative to the piston increases, resulting in greater diaphragm deformation and a corresponding increase in the medium flow rate in the media chamber. Conversely, when the pressure in the inlet chamber decreases, the offset of the diaphragm and bolt's fixing point relative to the piston decreases, resulting in less diaphragm deformation and a decrease in the medium flow rate in the media chamber. This invention achieves precise and stable flow control by adjusting the air pressure acting on the diaphragm, without the need to adjust the speed of the power components. Thus, while achieving a wide range of flow regulation, it maintains the stability and reliability of the power system operation.

[0007] Furthermore, the stepless pressure regulating device is either an electro-proportional valve or a precision pressure reducing valve driven by a control motor. Electro-proportional valves respond quickly and can directly receive standard control signals from automated systems, while motor-driven precision pressure reducing valves offer higher environmental adaptability and long-term stability. Both implementation methods can achieve precise, stepless regulation of the intake pressure, thus providing reliable and diverse technical options for the core stepless flow regulation function.

[0008] Furthermore, a pressure sensor is installed in the air intake chamber, and a pressure gauge connected to the pressure sensor signal is installed on the surface of the pump assembly. The pressure sensor and pressure gauge enable real-time monitoring and visualization of the working pressure of the air intake chamber, providing on-site operators with intuitive and reliable pressure readings, facilitating rapid inspection and fault diagnosis, and jointly improving the controllability and safety of equipment operation.

[0009] Furthermore, the diaphragm includes a first diaphragm in contact with the air inlet chamber and a second diaphragm in contact with the medium chamber, with the first diaphragm and the second diaphragm abutting against each other. This dual-diaphragm design constitutes a physical isolation barrier. The first diaphragm mainly withstands the air pressure, while the second diaphragm isolates the conveyed medium, and the two work together in close contact. This structure effectively prevents leakage of the medium and compressed air due to the failure of a single diaphragm, while also ensuring corrosion resistance and deformation capacity, significantly improving the sealing safety level and reliability of the pump body.

[0010] Furthermore, the first diaphragm is a Sandow rubber diaphragm, and the second diaphragm is a Teflon diaphragm. Sandow rubber diaphragms possess excellent elasticity and high fatigue resistance, making them suitable for withstanding frequent reciprocating deformations; Teflon diaphragms, on the other hand, have excellent chemical inertness and can withstand most corrosive media. The combination of these two materials, while ensuring the diaphragm's motion performance, greatly expands the chemical compatibility of the pump's transported media.

[0011] Furthermore, a leakage sensor for detecting diaphragm rupture is installed at the bottom of the air intake chamber. This leakage sensor is a conductivity sensor. The leakage sensor provides proactive safety monitoring and fault warning capabilities. When any diaphragm rupture causes conductive liquid to seep into the air intake chamber and touch the sensor electrodes, the system immediately issues an electrical alarm signal. This enables rapid and automatic identification of diaphragm failure, effectively preventing large-scale media leakage or gas source contamination, ensuring production safety, and facilitating preventative maintenance.

[0012] Furthermore, the pump assembly also includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the medium chamber via an inlet ball valve, and the outlet pipe is connected to the medium chamber via an outlet ball valve. This piping and valve configuration constitutes a complete and reliable fluid passage. The inlet and outlet pipes are responsible for transporting the medium, while the inlet and outlet ball valves provide a reliable shut-off function. When the pump needs maintenance or is to be shut down for an extended period, the ball valves can be closed to isolate the pump body from external piping, facilitating disassembly, repair, or replacement of components.

[0013] Furthermore, the transmission assembly includes a fixed shaft, a connecting shaft, a bearing assembly, and a guide shaft. The fixed shaft is connected to the output shaft of the power assembly and is used to transmit rotational motion. One end of the connecting shaft is connected to the fixed shaft and is eccentrically positioned relative to the axis of the fixed shaft. The other end of the connecting shaft is connected to the guide shaft. The bearing assembly includes multiple rolling bearings sleeved on the connecting shaft and bearing sleeves. The rolling bearings are disposed within the bearing sleeves. The guide shaft is connected to the piston. The rotational motion of the fixed shaft is converted into planar oscillation through the eccentrically positioned connecting shaft. The oscillation is ultimately constrained by the guide shaft, which can only move linearly, thereby driving the piston to perform precise linear reciprocating motion. The entire transmission assembly has a strong load-bearing capacity and a defined motion trajectory, providing stable and reliable reciprocating power to the piston, which is the basis for realizing fixed-stroke reciprocating motion. By fixing multiple rolling bearings with the bearing sleeves, the bearing sleeves bear the radial force during operation and distribute it evenly to the multiple rolling bearings, thereby dispersing the radial force, avoiding stress concentration, and extending service life.

[0014] Furthermore, the transmission assembly also includes a coupling assembly that connects the output shaft of the power assembly to the fixed shaft. A quincunx-shaped elastic washer is also provided between the coupling assembly and the fixed shaft. As an elastic element, the quincunx-shaped elastic washer effectively absorbs the impact and vibration generated by motor start-up and shutdown and load changes, and compensates for minor coaxiality deviations between the motor and the transmission shaft. This protects the motor, reducer, and transmission components from damage, significantly reduces operating noise, and improves the smoothness and service life of the entire transmission assembly.

[0015] Furthermore, the power assembly includes a drive motor and a reducer. The input end of the reducer is connected to the output shaft of the drive motor, and the output end is connected to the transmission assembly. This configuration provides constant and optimized power output. The drive motor provides raw rotational power, which the reducer converts into a low-speed, high-torque output. This allows the motor to continuously operate at a high-efficiency, stable rated speed, avoiding efficiency losses, insufficient torque, and additional wear caused by frequent speed adjustments, thus ensuring the reliability and efficiency of the power source.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. By adjusting the air pressure in the air inlet chamber to control the effective stroke of the diaphragm, the pump displacement is changed, achieving stepless flow regulation with high stability and high precision. This replaces the traditional method of regulation by changing the motor speed, making the flow output more stable and significantly reducing fluctuations, thus meeting the needs of higher precision fluid transportation and control. 2. The drive motor and reducer in the power assembly do not need to be frequently started and stopped or run at low speed for a long time. They always work under efficient and stable rated conditions, which reduces the impact and wear on the motor, reducer and transmission components, and significantly improves service life and equipment reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an electric diaphragm pump; Figure 2 for Figure 1 A cross-sectional view along the AA direction; Figure 3 for Figure 1 Cross-sectional view along the BB direction; Figure 4 Top view of an electric diaphragm pump; Figure 5 This is a schematic diagram of the transmission assembly. Figure 6 for Figure 5 A cross-sectional view along the CC direction.

[0018] In the attached diagram: 100, power assembly; 110, drive motor; 120, reducer; 200, transmission assembly; 210, fixed shaft; 220, connecting shaft; 230, bearing assembly; 231, rolling bearing; 232, bearing sleeve; 240, guide shaft; 250, coupling assembly; 300, pump body assembly; 310, piston; 320, diaphragm; 321, first diaphragm; 322, second diaphragm; 330, pull bolt; 340, inlet pipe; 341, inlet ball valve; 350, outlet pipe; 351, outlet ball valve; 400, air inlet chamber; 420, leakage sensor; 500, medium chamber; 600, stepless pressure regulating device; 700, pressure gauge. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0020] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Example 1 This embodiment is the first embodiment of an electric diaphragm pump, such as Figure 1 , Figure 2 As shown, the pump assembly includes a power component 100, a transmission component 200, and a pump body assembly 300. The power component 100 is connected to the transmission component 200. The pump body assembly 300 includes a piston 310 and a diaphragm 320. The transmission component 200 is connected to the piston 310 and drives the piston 310 to reciprocate. The piston 310 is provided with a pull bolt 330 connected to the diaphragm 320. An air inlet chamber 400 and a medium chamber 500 are respectively provided on both sides of the diaphragm 320 within the pump body assembly 300. A stepless pressure regulating device 600 is provided in the air inlet chamber 400.

[0022] The electric diaphragm pump of this invention provides constant power through the power component 100, which is transmitted through the transmission component 200 to drive the piston 310 to reciprocate within the pump body assembly 300. The piston 310, through the pull bolt 330 connected to it, drives the diaphragm 320 to move together, thereby completing the medium transportation process in the medium chamber 500. When flow rate adjustment is required, the stepless pressure regulating device 600 set in the air inlet chamber 400 can be operated to continuously adjust the air pressure in the air inlet chamber 400. This air pressure acts on the diaphragm 320, causing the relative position between the fixing point of the diaphragm 320 and the pull bolt 330 and the piston 310 to change, thereby achieving continuous and smooth stepless adjustment of the medium flow rate. When the pressure in the intake chamber 400 increases, the offset of the fixing points of the diaphragm 320 and the pull bolt 330 relative to the piston 310 increases, resulting in greater deformation of the diaphragm 320 and a corresponding increase in the flow rate of the medium in the medium chamber 500. Conversely, when the pressure in the intake chamber 400 decreases, the offset of the fixing points of the diaphragm 320 and the pull bolt 330 relative to the piston 310 decreases, resulting in less deformation of the diaphragm 320 and a decrease in the flow rate of the medium in the medium chamber 500. This invention achieves precise and stable flow control by adjusting the air pressure acting on the diaphragm 320, eliminating the need for speed adjustment of the power assembly 100. This allows for wide-range flow regulation while maintaining the stability and reliability of the power system. Figure 2 As shown, in this embodiment, the pull bolt 330 is a rod-shaped connector with one end fixed to the piston 310 and the other end connected to and pulling the diaphragm 320.

[0023] like Figure 4 As shown, the stepless pressure regulating device 600 is either an electro-proportional valve or a precision pressure reducing valve driven by a control motor. The electro-proportional valve responds quickly and can directly receive standard control signals from the automation system, while the motor-driven precision pressure reducing valve has higher environmental adaptability and long-term stability. Both implementation methods can achieve precise and stepless regulation of the intake pressure, thus providing reliable and diversified technical options for the core stepless flow regulation function.

[0024] A pressure sensor is installed in the air inlet chamber 400, and a pressure gauge 700 connected to the pressure sensor signal is installed on the surface of the pump body assembly 300. The pressure sensor and pressure gauge 700 enable real-time monitoring and visualization of the working pressure of the air inlet chamber 400, providing on-site operators with intuitive and reliable pressure readings, facilitating rapid inspection and fault diagnosis, and jointly improving the controllability and safety of equipment operation.

[0025] like Figure 2As shown, the diaphragm 320 includes a first diaphragm 321 that contacts the air inlet chamber 400 and a second diaphragm 322 that contacts the medium chamber 500. The first diaphragm 321 and the second diaphragm 322 abut against each other. This double diaphragm 320 design constitutes a physical isolation barrier. The first diaphragm 321 mainly bears the air pressure, while the second diaphragm 322 isolates the conveyed medium. The two work together in close contact. This structure can effectively prevent leakage of medium and compressed air caused by the failure of a single diaphragm 320, and also takes into account corrosion resistance and deformation capacity, significantly improving the sealing safety level and reliability of the pump body.

[0026] The first diaphragm 321 is a Santo rubber diaphragm, and the second diaphragm 322 is a Teflon diaphragm. The Santo rubber diaphragm has excellent elasticity and high fatigue resistance, making it suitable for withstanding frequent reciprocating deformation; the Teflon diaphragm has excellent chemical inertness and can withstand most corrosive media. The combination of the two ensures the motion performance of the diaphragm 320 while greatly expanding the chemical compatibility of the pumped media. In this embodiment, the Santo rubber is mainly obtained by blending polypropylene (PP) and ethylene propylene diene monomer (EPDM), and is a mixture of the two, with properties between rubber and plastic, belonging to thermoplastic vulcanized rubber.

[0027] A leakage sensor 420, a conductivity sensor, is installed at the bottom of the air intake chamber 400 to detect diaphragm 320 rupture. The leakage sensor 420 provides active safety monitoring and fault warning capabilities. When any diaphragm 320 ruptures, causing conductive liquid to seep into the air intake chamber 400 and touch the sensor electrodes, the system immediately issues an electrical alarm signal. This enables rapid and automatic identification of diaphragm 320 failure, effectively preventing large-scale media leakage or gas source contamination, ensuring production safety, and facilitating preventative maintenance.

[0028] Example 2 This embodiment is the second embodiment of the electric diaphragm pump. This embodiment is similar to the first embodiment, except that, as follows: Figure 2 As shown, the pump body assembly 300 also includes an inlet pipe 340 and an outlet pipe 350. The inlet pipe 340 is connected to the medium chamber 500 via an inlet ball valve 341, and the outlet pipe 350 is connected to the medium chamber 500 via an outlet ball valve 351. This piping and valve configuration constitutes a complete and reliable fluid passage. The inlet pipe 340 and outlet pipe 350 are responsible for the delivery of the medium, while the inlet ball valve 341 and outlet ball valve 351 provide a reliable shut-off function. When the pump needs maintenance or is shut down for a long period, the ball valves can be closed to isolate the pump body from the external piping, facilitating disassembly, maintenance, or replacement of components.

[0029] like Figure 4 , Figure 5As shown, the transmission assembly 200 includes a fixed shaft 210, a connecting shaft 220, a bearing assembly 230, and a guide shaft 240. The fixed shaft 210 is connected to the output shaft of the power assembly 100 and is used to transmit rotational motion. One end of the connecting shaft 220 is connected to the fixed shaft 210 and is eccentrically positioned relative to the axis of the fixed shaft 210. The other end of the connecting shaft 220 is connected to the guide shaft 240. The bearing assembly 230 includes multiple rolling bearings 231 and bearing sleeves 232 sleeved on the connecting shaft 220. The rolling bearings 231 are disposed within the bearing sleeves 232. The guide shaft 240 is connected to the piston 310. The rotational motion of the fixed shaft 210 is converted into planar oscillation through the eccentrically positioned connecting shaft 220, and the oscillation is ultimately constrained by the guide shaft 240, which can only move linearly, thereby driving the piston 310 to perform precise linear reciprocating motion. The entire transmission assembly 200 has a strong load-bearing capacity and a defined motion trajectory, providing stable and reliable reciprocating power for the piston 310, which is the basis for realizing fixed-stroke reciprocating motion. Multiple rolling bearings 231 are fixed by bushings, and the bearing sleeve 232 bears the radial force during the working process and distributes it evenly to the multiple rolling bearings 231, thereby dispersing the radial force, avoiding stress concentration, and extending the service life.

[0030] Example 3 This embodiment is the third embodiment of the electric diaphragm pump. This embodiment is similar to Embodiment 1, except that, as Figure 3 As shown, the transmission assembly 200 also includes a coupling assembly 250, which connects the output shaft of the power assembly 100 to the fixed shaft 210. A plum blossom-shaped elastic washer is also provided between the coupling assembly 250 and the fixed shaft 210. As an elastic element, the plum blossom-shaped elastic washer can effectively absorb the impact and vibration generated by the motor starting and stopping and load changes, and compensate for the small coaxiality deviation between the motor and the transmission shaft. This protects the motor, reducer 120 and transmission components from damage, significantly reduces operating noise, and improves the smoothness and service life of the entire transmission assembly 200.

[0031] like Figure 3 As shown, the power assembly 100 includes a drive motor 110 and a reducer 120. The input end of the reducer 120 is connected to the output shaft of the drive motor 110, and the output end is connected to the transmission assembly 200. This configuration provides constant and optimized power output. The drive motor 110 provides raw rotational power, which the reducer 120 converts into a low-speed, high-torque output. This allows the motor to continuously operate at a high-efficiency, stable rated speed, avoiding efficiency losses, insufficient torque, and additional wear caused by frequent speed adjustments, thus ensuring the reliability and efficiency of the power source.

[0032] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0033] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electric diaphragm pump, characterized in that, The system includes a power assembly (100), a transmission assembly (200), and a pump assembly (300). The power assembly (100) is connected to the transmission assembly (200). The pump assembly (300) includes a piston (310) and a diaphragm (320). The transmission assembly (200) is connected to the piston (310) and drives the piston (310) to reciprocate. The piston (310) is provided with a pull bolt (330) connected to the diaphragm (320). An air inlet chamber (400) and a medium chamber (500) are respectively provided on both sides of the diaphragm (320) and are located in the pump assembly (300). A stepless pressure regulating device (600) is provided in the air inlet chamber (400).

2. The electric diaphragm pump according to claim 1, characterized in that, The stepless pressure regulating device (600) is an electro-proportional valve or a precision pressure reducing valve driven by a control motor.

3. The electric diaphragm pump according to claim 1, characterized in that, A pressure sensor is provided in the air intake chamber (400), and a pressure gauge (700) connected to the pressure sensor signal is provided on the surface of the pump body assembly (300).

4. The electric diaphragm pump according to claim 1, characterized in that, The diaphragm (320) includes a first diaphragm (321) in contact with the air inlet chamber (400) and a second diaphragm (322) in contact with the medium chamber (500), wherein the first diaphragm (321) and the second diaphragm (322) abut against each other.

5. The electric diaphragm pump according to claim 4, characterized in that, The first diaphragm (321) is a sandy rubber diaphragm, and the second diaphragm (322) is a Teflon diaphragm.

6. The electric diaphragm pump according to any one of claims 1 to 5, characterized in that, The bottom of the air intake chamber (400) is provided with a leakage sensor (420) for detecting the rupture of the diaphragm (320), and the leakage sensor (420) is a conductivity sensor.

7. The electric diaphragm pump according to any one of claims 1 to 5, characterized in that, The pump body assembly (300) further includes an inlet pipe (340) and an outlet pipe (350). The inlet pipe (340) is connected to the medium chamber (500) through an inlet ball valve (341), and the outlet pipe (350) is connected to the medium chamber (500) through an outlet ball valve (351).

8. The electric diaphragm pump according to any one of claims 1 to 5, characterized in that, The transmission assembly (200) includes a fixed shaft (210), a connecting shaft (220), a bearing assembly (230), and a guide shaft (240). The fixed shaft (210) is connected to the output shaft of the power assembly (100) and is used to transmit rotational motion. One end of the connecting shaft (220) is connected to the fixed shaft (210) and is eccentrically arranged relative to the axis of the fixed shaft (210). The other end of the connecting shaft (220) is connected to the guide shaft (240). The bearing assembly (230) includes a plurality of rolling bearings (231) sleeved on the connecting shaft (220) and a bearing sleeve (232). The rolling bearings (231) are disposed in the bearing sleeve (232). The guide shaft (240) is connected to the piston (310).

9. The electric diaphragm pump according to claim 8, characterized in that, The transmission assembly (200) also includes a coupling assembly (250), which connects the output shaft of the power assembly (100) to the fixed shaft (210). A plum blossom-shaped elastic washer is also provided between the coupling assembly (250) and the fixed shaft (210).

10. The electric diaphragm pump according to claim 1, characterized in that, The power assembly (100) includes a drive motor (110) and a reducer (120). The input end of the reducer (120) is connected to the output shaft of the drive motor (110), and the output end is connected to the transmission assembly (200).

Images