Double chamber diaphragm pump with control valve
By increasing the number of discharge pipes in the dual-chamber diaphragm pump and using a crankshaft assembly to transmit torque, combined with a control valve to regulate the flow rate, the problem of insufficient power of pneumatic diaphragm pumps in space-constrained environments was solved, achieving high-pressure and high-efficiency jet feeding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING DONGFANG CHANGMING CONSULTING SERVICE CO LTD
- Filing Date
- 2023-12-22
- Publication Date
- 2026-06-23
Smart Images
Figure CN117552961B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of diaphragm pump technology, and more specifically to a dual-chamber diaphragm pump with a control valve. Background Technology
[0002] A diaphragm pump uses a diaphragm to separate the pumped liquid from the piston and cylinder, thus protecting the piston and cylinder. The left side of the diaphragm, which is in contact with the liquid, is made of corrosion-resistant material or coated with a corrosion-resistant substance, while the right side of the diaphragm is filled with water or oil.
[0003] Most existing diaphragm pumps are single-inlet, single-outlet pumps and are pneumatic diaphragm pumps, using high-pressure air to drive the diaphragm in reciprocating motion. Because the diaphragm is moved by air pressure, the power is relatively weak. If increased power is needed, the pump body size must be increased accordingly, which makes it difficult to move and inconvenient to use in construction environments with limited space. Furthermore, if a single-inlet, two-outlet pump is used, with two spray guns operating simultaneously, a significant pressure deficiency problem will occur, affecting both spray guns. Summary of the Invention
[0004] To address the shortcomings of existing technologies and improve pump suction by increasing the number of discharge pipes, this invention provides a dual-chamber diaphragm pump with a control valve, comprising a control valve, a pump body, a crankshaft assembly, a left diaphragm, and a right diaphragm; the crankshaft assembly is rotatably connected to the inner cavity of the pump body, and the input shaft of the crankshaft assembly extends from the rear side of the pump body;
[0005] The pump body has a left piston chamber and a right piston chamber on its left and right sides, respectively. Both the left and right piston chambers have piston connecting rod mechanisms that are connected to the crankshaft assembly. The left side of the pump body has a left pressure box that communicates with the left piston chamber. The left diaphragm is connected to the piston connecting rod mechanism of the left piston chamber and is sealed between the left piston chamber and the left pressure box. The right side of the pump body has a right pressure box that communicates with the right piston chamber. The right diaphragm is connected to the piston connecting rod mechanism of the right piston chamber and is sealed between the right piston chamber and the right pressure box.
[0006] The pump body is provided with an inlet pipe and an outlet. The inlet pipe is connected to the left pressure box and the right pressure box respectively through the inlet pipe, and the outlet is connected to the left pressure box and the right pressure box respectively through the outlet pipe.
[0007] The control valve includes a valve body, a regulating pipe, a valve core, a lever, and a knob. The valve body has an inlet, a left outlet pipe, a right outlet pipe, and a return pipe on its rear, left, right, and upper sides, respectively. The lower part of the regulating pipe is threadedly sealed to the return pipe. The return pipe has a return hole on its side, and the regulating pipe has a flow hole corresponding to the return hole on its side wall. The lever is fixedly sleeved on the outside of the regulating pipe. Rotating the regulating pipe with the lever aligns or misaligns the return hole and the flow hole, thereby opening or closing the return hole. The valve core is slidably connected to the inside of the regulating pipe. The knob is threadedly connected to the upper end of the regulating pipe, and the valve core and the knob are connected by a spring. Rotating the knob changes the effective area of the valve core blocking the flow hole, thereby adjusting the flow rate of the return hole.
[0008] The discharge port is connected to the inlet port, thereby fixing the control valve and pump body together.
[0009] The upper part of the pump body is provided with a material chamber, and two discharge pipes and discharge ports are respectively connected to the material chamber; the upper end of the pump body is provided with a top cover, which seals the material chamber through an upper diaphragm and forms an air chamber between the upper diaphragm and the top cover; the top cover is provided with an air inlet and an air outlet, which are connected to an external pneumatic system. The air inlet and air outlet are controlled by the pneumatic system, thereby causing the upper diaphragm to bulge upward and sag downward to increase the pressure at the discharge port.
[0010] The beneficial effects of this invention are as follows:
[0011] 1. The pump's main power comes from explosion-proof motors, explosion-proof internal combustion engines, pneumatic motors, hydraulic motors, etc., which drive the input shaft to rotate. Through the crankshaft assembly and piston-connecting rod mechanism, this drives the left and right diaphragms to reciprocate. The left and right pressure chambers alternate between suction and discharge, creating a continuous cycle that generates the power to spray material. Compared to existing dual-chamber diaphragm pumps that directly drive the diaphragm with air pressure, the crankshaft assembly, left piston-connecting rod mechanism, and right piston-connecting rod mechanism transmit greater and more direct torque, resulting in higher pump pressure. A control valve allows for one-to-one or one-to-two operation, ensuring sufficient pressure for both spray guns without interference. Additionally, a knob can be used to control the flow rate of the return pipeline, thereby adjusting the spray gun pressure.
[0012] 2. The external pneumatic system's air supply line is connected to the air inlet, and the air intake line is connected to the air outlet. The air supply and intake lines alternate, causing the upper diaphragm to bulge up and down repeatedly. During the upward bulging of the upper diaphragm, the air supply line closes while the intake line opens, reducing the air pressure in the air chamber and forcing material into the material chamber from the left and right pressure boxes. During the downward bulging of the upper diaphragm, the air supply line opens while the intake line closes, increasing the air pressure in the air chamber and forcing material into the material chamber from the left and right pressure boxes. Simultaneously, the upper diaphragm compresses the material in the material chamber, increasing pump pressure and resulting in a higher output pressure.
[0013] Preferably, the piston-connecting rod mechanism includes a piston body, a connecting rod, and a piston sleeve; the piston body is slidably connected to the left piston chamber or the right piston chamber through the piston sleeve, and the connecting rod is hinged between the crankshaft assembly and the piston body.
[0014] Preferably, the crankshaft assembly has a crank neck, and each connecting rod of the piston-connecting rod mechanism has a semi-circular ring. The two semi-circular rings are fitted onto the crank neck through bearing bushes, thereby enabling the two connecting rods to be rotatably connected to the crankshaft assembly. The two connecting rods share a single crank neck, and the two pistons alternately pump material, thus ensuring uninterrupted material pumping.
[0015] Preferably, the input shaft is rotatably connected to the rear side of the pump body via ball bearings, an oil seal, and a bracket, while the feed pipe and discharge port are both located on the front side of the pump body. The other end of the crankshaft assembly is rotatably connected to the inner side of the pump body via another ball bearing, and the two ball bearings ensure that the crankshaft assembly rotates smoothly without shaking.
[0016] Preferably, both the left and right pressure chambers are equipped with suction valve assemblies corresponding to the respective feed pipes, and discharge valve assemblies corresponding to the respective discharge pipes. The suction valve assembly enables the suction process and closes the discharge process. The discharge valve assembly closes the suction process and enables the discharge process. The suction and discharge valve assemblies work together to ensure that the pump always maintains a suction and discharge cycle.
[0017] Preferably, the left discharge pipe and the right discharge pipe are each equipped with a manual valve.
[0018] Preferably, a pressure gauge communicating with the inner cavity of the valve body is provided on the front side of the valve body. The pressure gauge is connected to the inner cavity and can display the pressure value inside the valve in real time, thereby providing feedback on the discharge pressure.
[0019] Preferably, the valve core has a T-shaped cross-section, and the valve body has a guide tube coaxial with the valve core inside its cavity, with the lower part of the valve body slidably sealed within the guide tube. The knob has a downward-facing limiting rod inside, the upper end of the valve core has a limiting boss, and the two ends of the spring are respectively fitted onto the limiting rod and the limiting boss, with washers at both ends of the spring.
[0020] Preferably, the pump body is provided with oil holes communicating with the left piston chamber and the right piston chamber respectively, and each oil hole is provided with a sealing plug. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0022] Figure 1 This is a schematic diagram of the structure of this embodiment;
[0023] Figure 2 for Figure 1 A bottom view;
[0024] Figure 3 This is a schematic diagram of the pump body in this embodiment. Figure 1 ;
[0025] Figure 4 This is a schematic diagram of the pump body in this embodiment. Figure 2 ;
[0026] Figure 5 This is a schematic diagram of the control valve in this embodiment.
[0027] In the attached diagram, the components are: pump body 1, right diaphragm 2, piston connecting rod mechanism 3, ball bearing 4, oil seal 5, bracket seal 6, feed pipe 7, discharge port 8, left pressure box 9, right pressure box 10, right piston chamber 11, crank neck 12, piston sleeve 13, feed pipe 14, discharge pipe 15, material chamber 16, top cover 17, upper diaphragm 18, discharge valve assembly 19, suction valve assembly 20, valve body 21, regulating pipe 22, valve core 23, lever wrench 24, knob 25, feed port 26, left discharge pipe 27, right discharge pipe 28, return pipe 29, manual valve 30, pressure gauge 31, return hole 32, flow hole 33, spring 34, guide pipe 35, limit rod 36, limit boss 37, washer 38, input shaft 39, air inlet 40, exhaust nozzle 41, oil hole 42, and sealing plug 43. Detailed Implementation
[0028] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.
[0029] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
[0030] like Figures 1 to 4 As shown, this embodiment provides a dual-chamber diaphragm pump with a control valve, including a control valve, a pump body 1, a crankshaft assembly, a left diaphragm, and a right diaphragm 2. The crankshaft assembly is rotatably connected to the inner cavity of the pump body 1, and the input shaft 39 of the crankshaft assembly extends from the rear side of the pump body 1. Specifically, the input shaft 39 is rotatably connected to the rear side of the pump body 1 via ball bearings 4, an oil seal 5, and a bracket seal 6. The feed pipe 7 and the discharge pipe are both located on the front side of the pump body 1. The other end of the crankshaft assembly is rotatably connected to the inner side of the pump body 1 via another ball bearing 4. The two ball bearings 4 ensure that the crankshaft assembly rotates smoothly without shaking. The pump body 1 has a left piston chamber and a right piston chamber 11 on its left and right sides, respectively. Both the left and right piston chambers 11 have piston-connecting rod mechanisms 3 connected to the crankshaft assembly. The left side of the pump body 1 has a left pressure box 9 communicating with the left piston chamber. The left diaphragm is connected to the piston-connecting rod mechanism 3 of the left piston chamber, and the left diaphragm seals between the left piston chamber and the left pressure box 9. The right side of the pump body 1 has a right pressure box 10 communicating with the right piston chamber 11. The right diaphragm 2 is connected to the piston-connecting rod mechanism 3 of the right piston chamber 11, and the right diaphragm 2 seals between the right piston chamber 11 and the right pressure box 10. The piston-connecting rod mechanism 3 includes a piston body, a connecting rod, and a piston sleeve 13. The piston body is slidably connected to the left or right piston chamber 11 via the piston sleeve 13, and the connecting rod is hinged between the crankshaft assembly and the piston body. Furthermore, the crankshaft assembly includes a crank neck 12, and each connecting rod of the piston-connecting rod mechanism has a semi-circular ring. Two semi-circular rings are fitted onto the crank neck 12 via bearing bushes, thereby enabling the two connecting rods to rotate and connect with the crankshaft assembly. The two connecting rods share a single crank neck 12, and the two piston bodies alternately pump material, ensuring continuous material output. Additionally, the pump body 1 has oil holes communicating with the left and right piston chambers 11, and each oil hole is equipped with a sealing plug.
[0031] A feed pipe 7 and a discharge port 8 are provided at the front of the pump body 1. The feed pipe 7 is connected to the left pressure box 9 and the right pressure box 10 respectively, and the discharge port 8 is connected to the left pressure box 9 and the right pressure box 10 respectively through the discharge pipe 15. Furthermore, a material chamber 16 is provided at the upper part of the pump body 1, and the two discharge pipes 15 and the discharge port 8 are respectively connected to the material chamber 16. The pump body 1 has a material chamber 16 at its upper part, with two discharge pipes 15 and discharge port 8 connected to the material chamber 16 respectively. A top cover 17 is located at the upper end of the pump body 1, sealing the material chamber 16 through an upper diaphragm 18, forming an air cavity between the upper diaphragm 18 and the top cover 17. The top cover 17 has an air inlet 40 and an air outlet 41, which are connected to an external pneumatic system. The pneumatic system controls the air intake and exhaust, causing the upper diaphragm 18 to bulge upwards and downwards repeatedly to increase the pressure at the discharge port 8. The left pressure chamber 9 and the right pressure chamber 10 each have a suction valve assembly 20 corresponding to the corresponding feed pipe 7, and a discharge valve assembly 19 corresponding to the corresponding discharge pipe 15. The suction valve assembly 20 allows the suction process to proceed while closing the discharge process. The discharge valve assembly 19 closes the suction process while allowing the discharge process to proceed. The discharge valve assembly 19 and the suction valve assembly 20 work together to ensure that the pump can always maintain a suction and discharge cycle.
[0032] The specific structure of the control valve in this embodiment is as follows:
[0033] like Figure 5As shown, the control valve includes a valve body 21, a regulating pipe 22, a valve core 23, a lever 24, and a knob 25. The valve body 21 has an inlet 26, a left outlet pipe 27, a right outlet pipe 28, and a return pipe 29 on its rear, left, right, and upper sides, respectively. The lower part of the regulating pipe 22 is threadedly sealed to the return pipe 29. The left outlet pipe 27 and right outlet pipe 28 are each equipped with a manual valve 30. A pressure gauge 31, communicating with the inner cavity of the valve body 21, is located on the front side of the valve body 21. The pressure gauge 31, communicating with the inner cavity, can display the pressure value inside the valve in real time, thus providing feedback on the discharge pressure. The return pipe 29 has a return hole 32 on its side, and the regulating pipe 22 has a flow hole 33 corresponding to the return hole 32 on its side wall. The lever wrench 24 is fixedly sleeved on the outside of the regulating pipe 22. By rotating the regulating pipe 22 with the lever wrench 24, the return hole 32 and the flow hole 33 are aligned or misaligned, thereby opening or closing the return hole 32. The valve core 23 is slidably connected to the inside of the regulating pipe 22, and the knob 25 is threadedly connected to the upper end of the regulating pipe 22. The valve core 23 and the knob 25 are connected by a spring 34. By rotating the knob 25, the effective area of the valve core 23 blocking the flow hole 33 is changed, thereby adjusting the flow rate of the return hole 32. Specifically, the cross-sectional shape of the valve core 23 is T-shaped, and the inner cavity of the valve body 21 has a guide tube 35 coaxial with the valve core 23. The lower part of the valve body 21 is slidably sealed in the guide tube 35. The knob 25 has a downward-facing limiting rod 36 inside, the upper end of the valve core 23 has a limiting boss 37, the two ends of the spring 34 are respectively sleeved on the limiting rod 36 and the limiting boss 37, and the two ends of the spring 34 are respectively provided with washers 38.
[0034] In this embodiment, the valve body 21 is connected to the pump body 1 as follows:
[0035] like Figure 1 and Figure 2As shown, the discharge port 8 of the pump body 1 is fixedly connected to the inlet 26 of the valve body 21, thus fixing the control valve and the pump body 1 together. An external power source (such as an electric motor, internal combustion engine, pneumatic motor, hydraulic motor, etc.) drives the input shaft 39 to rotate, drawing in material through the feed pipe 7 of the pump body 1. The material is then pumped into the inlet 26 of the valve body 21 through the pump body 1. A portion of the material is pumped out through the left discharge pipe 27, another portion through the right discharge pipe 28, and the remaining material is returned to the raw material container through the return pipe 29. If it is necessary to adjust the pump pressure or flow rate, the flow rate of the return pipeline needs to be controlled by the knob 25. Specifically, the adjusting pipe 22 is rotated 90° clockwise by the lever wrench 24, aligning the return hole 32 and the flow passage 33. Then rotate knob 25. Knob 25 moves downward, and spring 34 presses down valve core 23, causing valve core 23 to slowly block return port 32, reducing the return flow of paint. This increases the discharge pressure of left outlet pipe 27 and right outlet pipe 28, thus increasing the spraying distance and spray volume. Conversely, rotating knob 25 in the opposite direction reduces the spraying distance and spray volume. If it is necessary to close return port 32 and adjust spraying distance and spray volume to the maximum, rotate regulating pipe 22 counterclockwise, causing return port 32 and flow port 33 to be misaligned.
[0036] Unlike existing dual-chamber diaphragm pumps, this pump features a dual-power structure, meaning it has both active and auxiliary power. The active power is generated by an explosion-proof motor, explosion-proof internal combustion engine, pneumatic motor, or hydraulic motor, which drives the input shaft 39 to rotate. This rotation, via the crankshaft assembly and piston-connecting rod mechanism 3, simultaneously drives the left and right diaphragms 2 to continuously pump material into the material chamber 16, and then pumps it out. The auxiliary power comes from the external pneumatic system: the air supply line is connected to the air inlet 40, and the suction line is connected to the exhaust port 41. The air supply and suction lines alternate, causing the upper diaphragm 18 to bulge up and down repeatedly. During the upward bulging of the upper diaphragm 18, the air supply line closes while the suction line opens, reducing the air pressure in the air chamber. Material is then forced into the material chamber 16 from the left pressure chamber 9 and the right pressure chamber 10. As the upper diaphragm 18 bulges downward, the air supply line opens and the air intake line closes, increasing the air pressure in the air chamber. Material continues to be forced into the material chamber 16 from the left pressure box 9 and the right pressure box 10. At the same time, the upper diaphragm 18 squeezes the material in the material chamber 16, thereby increasing the pump pressure.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.
Claims
1. A dual-chamber diaphragm pump with a control valve; characterized in that: It includes a control valve, a pump body, a crankshaft assembly, a left diaphragm, and a right diaphragm; the crankshaft assembly is rotatably connected to the inner cavity of the pump body, and the input shaft of the crankshaft assembly extends from the rear side of the pump body; The pump body has a left piston chamber and a right piston chamber on its left and right sides, respectively. Both the left and right piston chambers have piston connecting rod mechanisms that are connected to the crankshaft assembly. The left side of the pump body has a left pressure box that communicates with the left piston chamber. The left diaphragm is connected to the piston connecting rod mechanism of the left piston chamber and is sealed between the left piston chamber and the left pressure box. The right side of the pump body has a right pressure box that communicates with the right piston chamber. The right diaphragm is connected to the piston connecting rod mechanism of the right piston chamber and is sealed between the right piston chamber and the right pressure box. The pump body is provided with an inlet pipe and an outlet. The inlet pipe is connected to the left pressure box and the right pressure box respectively through the inlet pipe, and the outlet is connected to the left pressure box and the right pressure box respectively through the outlet pipe. The control valve includes a valve body, a regulating pipe, a valve core, a lever, and a knob. The valve body has an inlet, a left outlet pipe, a right outlet pipe, and a return pipe on its rear, left, right, and upper sides, respectively. The lower part of the regulating pipe is threadedly sealed to the return pipe. The return pipe has a return hole on its side, and the regulating pipe has a flow hole corresponding to the return hole on its side wall. The lever is fixedly sleeved on the outside of the regulating pipe. Rotating the regulating pipe with the lever aligns or misaligns the return hole and the flow hole, thereby opening or closing the return hole. The valve core is slidably connected to the inside of the regulating pipe. The knob is threadedly connected to the upper end of the regulating pipe, and the valve core and the knob are connected by a spring. Rotating the knob changes the effective area of the valve core blocking the flow hole, thereby adjusting the flow rate of the return hole. The discharge port is connected to the inlet, thereby fixing the control valve and the pump body together. The upper part of the pump body is provided with a material chamber, and two discharge pipes and discharge ports are respectively connected to the material chamber; the upper end of the pump body is provided with a top cover, which seals the material chamber through an upper diaphragm and forms an air chamber between the upper diaphragm and the top cover; the top cover is provided with an air inlet and an air outlet, which are connected to an external pneumatic system. The air inlet and air outlet are controlled by the pneumatic system, thereby causing the upper diaphragm to bulge upward and sag downward to increase the pressure at the discharge port.
2. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The piston-connecting rod mechanism includes a piston body, a connecting rod, and a piston sleeve; the piston body is slidably connected to the left piston chamber or the right piston chamber through the piston sleeve, and the connecting rod is hinged between the crankshaft assembly and the piston body.
3. The dual-chamber diaphragm pump with a control valve according to claim 2, characterized in that: The crankshaft assembly has a crank neck, and each connecting rod of the piston rod mechanism has a semi-circular ring. The two semi-circular rings are fitted onto the crank neck through bearing bushes, thereby enabling the two connecting rods to be rotatably connected to the crankshaft assembly.
4. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The input shaft is rotatably connected to the rear side of the pump body via ball bearings, oil seals, and brackets, while the feed pipe and discharge port are both located on the front side of the pump body.
5. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The left and right pressure boxes are each equipped with a suction valve assembly corresponding to the corresponding feed pipe and a discharge valve assembly corresponding to the corresponding discharge pipe.
6. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The left and right discharge pipes are each equipped with a manual valve.
7. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: A pressure gauge communicating with the inner cavity of the valve body is provided on the front side of the valve body.
8. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The valve core has a T-shaped cross-section, and the valve body has a guide tube coaxial with the valve core in its inner cavity. The lower part of the valve body is slidably sealed in the guide tube.
9. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The knob has a downward-facing limiting rod inside, the upper end of the valve core has a limiting boss, the two ends of the spring are respectively fitted onto the limiting rod and the limiting boss, and the two ends of the spring are respectively provided with washers.
10. The dual-chamber diaphragm pump with a control valve according to claim 1, characterized in that: The pump body is provided with oil holes that communicate with the left piston chamber and the right piston chamber, and each oil hole is provided with a sealing plug.