Combined diaphragm pump capable of being connected in parallel or in series

Abstract

The invention relates to the field of fluid medium conveying and pressurizing, and discloses a combined diaphragm pump capable of being connected in parallel and in series, which comprises a diaphragm, a rotor is arranged in the diaphragm, a needle bearing is arranged on the inner side of a gear outside the rotor, a crankshaft is arranged on the inner side of the needle bearing, and a piston is arranged on the crankshaft. A gear outside the rotor is connected with an inner gear ring in a meshed mode, the outer portion of the inner gear ring is arranged on the inner side of an inner gear ring fixing base through fastening screws, the outer portion of the inner gear ring fixing base is connected with the corresponding pumping chambers through a plurality of first fastening bolts, and a ball roller bearing is arranged on the inner side of the inner gear ring fixing base. According to the three-cavity phase difference rotary extrusion scheme, modular pipelines can be switched in series and in parallel, the triangular rotor machine outer envelope line cavity structure and the split type pumping chamber buckle connection design are innovated, the problems that a traditional diaphragm pump is large in flow pulse, low in efficiency, large in size, complex in structure and the like are solved, and efficient, energy-saving and adjustable fluid conveying is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid medium conveying and pressurizing, in particular to a combined diaphragm pump which can be connected in parallel or in series. BACKGROUND

[0002] Water is the source of human life, so water transportation and storage play a crucial role in all aspects of our lives. From the first lever water lifting machine, to the later spiral water lifting device, to the waterwheel in ancient China, to the widely used electrically driven centrifugal pump today, the water pump, as the oldest energy power machinery in the world, has always been an indispensable tool in various industries. The development process of pump technology is closely related to the progress of human civilization, and promotes the transformation of various fields such as industry, agriculture, and urban development.

[0003] In modern times, there are various types of pumps, which can be divided into centrifugal and radial types according to the flow mode, volumetric and vane types according to the working principle, and single-stage and double-stage types according to the structure. Pump technology and its types have developed rapidly in modern times, but at the same time, the pump industry still faces many challenges. For example, the blade root cavitation phenomenon exists in vane pumps, which is difficult to completely eliminate; reciprocating pumps are difficult to balance the flow pulse during operation; the working efficiency of double-suction pumps is also difficult to further improve. In particular, for diaphragm pumps, the flow and pressure fluctuation is large, which affects the system stability; the clearance volume is large, which leads to low efficiency; the structure is complex, which makes it difficult to disassemble and assemble, and increases the maintenance difficulty; under the same flow, the pump body volume is large, which limits its application in some occasions. Therefore, a combined diaphragm pump which can be connected in parallel or in series is proposed to solve the above problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a combined diaphragm pump which can be connected in parallel or in series, solving the problems of large flow pulse, low efficiency, complex structure, and large volume.

[0005] In order to achieve the above object, the application is implemented by the following technical scheme: A combined diaphragm pump capable of being connected in parallel and in series, comprising a diaphragm, wherein the inside of the diaphragm is provided with a rotor, the inside of a gear on the outside of the rotor is provided with a needle bearing, the inside of the needle bearing is provided with a crankshaft, the gear on the outside of the rotor is engagedly connected with an inner gear ring, the outside of the inner gear ring is provided on the inside of an inner gear ring fixing base through fastening screws, the outside of the inner gear ring fixing base is respectively connected with corresponding water pressure chambers through a plurality of fastening bolts I, the inside of the inner gear ring fixing base is provided with a ball roller bearing, the outside of the ball roller bearing is provided with a bearing end cover, and the bearing end cover is provided on the inside of the inner gear ring fixing base through a plurality of hinge bolts, the outside of the diaphragm is provided with three water pressure chambers, the three water pressure chambers are connected through a plurality of fastening bolts II, and the inside of the edges of the diaphragm is provided with a plurality of diaphragm pressing plates, and the diaphragm pressing plates, the water pressure chambers and the edges of the diaphragm are connected through a plurality of connecting bolts.

[0006] Preferably, the diaphragm adopts a whole three-edge diaphragm, the edges of the three-edge diaphragm are thick, the diaphragm pressing plates and the water pressure chambers extrude to form a sealing structure with the function of an O-shaped ring for realizing the sealing effect, and the middle part of the diaphragm is thin and elastic.

[0007] Preferably, the inner and outer walls of the three water pressure chambers are all cycloids, and there is a certain gap between the inner walls of the three water pressure chambers and the outside of the rotor for ensuring that the rotor can operate without obstruction, and the gap is also sufficient to ensure that the diaphragm can be accommodated therein.

[0008] Preferably, the outside of the water pressure chamber is provided with a fixing block, and the fixing block is used for positioning the inner gear ring fixing base and providing the required fastening depth of the fastening bolts I.

[0009] Preferably, the top of the water pressure chamber is provided with two bosses, the two bosses are respectively provided with a water inlet and a water outlet, the outside of the bosses is respectively provided with a check valve for connecting the pump and the pipeline.

[0010] Preferably, one end of the crankshaft is connected with a motor input end, the other end of the crankshaft is connected with the rotor to drive the rotor to rotate along a cycloid track for extruding the diaphragm to do work on the working medium, the two ends of the crankshaft are different in center, the inside of the crankshaft is equidistantly provided with balance holes for balancing the dynamic and static balance of the crankshaft, and the outside of the crankshaft is provided with a key groove for connecting the motor.

[0011] Preferably, the inside of the inner gear ring fixing base is provided with a cavity for allowing the crankshaft to pass through smoothly.

[0012] Preferably, the outer ring of the diaphragm is also provided with a plurality of grooves for enhancing sealing under high pressure working conditions, and the diaphragm material is made of nitrile rubber and natural rubber high-elastic material.

[0013] The application provides a combined diaphragm pump which can be connected in parallel or in series. 1. The application adopts a three-chamber phase difference rotating extrusion scheme, three water compression chambers work alternately, the phase difference is 240 degrees, and the trochoidal trajectory motion converts the traditional single-end pulse output into continuous and smooth flow, and the pressure fluctuation is reduced by more than 60%. Compared with the inertial impact problem of the reciprocating diaphragm pump, the defects of severe pipeline vibration and sealing failure during high-viscosity medium conveying are solved.

[0014] 2. The modular pipeline interface of the application can be switched in series or in parallel, three independent flow channels of the three water compression chambers are combined with the one-way valve to realize dynamic adjustment of the flow / pressure of a single device. Compared with the traditional fixed connection pump body, the limitation that large flow and low pressure and high head and small flow cannot be compatible is broken, and the mixed medium conveying demand in multiple scenes such as chemical industry and food industry is met.

[0015] 3. The application innovates the outer envelope line cavity structure of the triangular rotor machine, the inner envelope line redundant space is removed, and the clearance volume is optimized, so that the weight of the pump body is reduced by 50%, and the volume is reduced by 40%. Compared with the rectangular or cylindrical chamber design of the traditional diaphragm pump, the technical pain points of material waste and efficiency limited by residual clearance are overcome.

[0016] 4. The application provides a split water compression chamber and a buckle connection alternative solution, which allows quick replacement of material combinations according to medium corrosion, pressure rating, such as cast iron-natural rubber or 2205 stainless steel-polyethylene, and supports flexible assembly of high-pressure bolts and low-pressure buckles. Compared with the welded integrated pump body, the industry problem of poor adaptability in miniaturization scenarios and high maintenance cost is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a general assembly perspective view of the application; Figure 2 It is a general explosion schematic view of the application; Figure 3 It is a diaphragm non-working state schematic view of the application; Figure 4 It is a diaphragm working state schematic view of the application; Figure 5 It is a crankshaft schematic view of the application; Figure 6 It is a one-way valve principle schematic view of the application; Figure 7 It is a working principle schematic view of the application; Figure 8The traditional diaphragm pump of the present application and the pulse fluctuation comparison schematic diagram of the present application; Figure 9 The schematic diagram of the series-parallel pipeline connection of the present application; Figure 10 The invention shape creation principle diagram of the present application.

[0018] 1, hinged bolt; 2, bearing end cover; 3, ball roller bearing; 4, fastening bolt one; 5, inner tooth ring fixing seat; 6, inner tooth ring; 7, fastening screw; 8, diaphragm pressing plate; 9, crankshaft; 10, connecting bolt; 11, one-way valve; 12, water pressing chamber; 13, fastening bolt two; 14, diaphragm; 15, rotor; 16, needle roller bearing. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 7 The embodiment of the present application provides a combined diaphragm pump which can be connected in parallel and in series, comprising a diaphragm 14, the inside of the diaphragm 14 is provided with a rotor 15, the diaphragm 14 adopts a whole three-edge diaphragm 14, the edge of the three-edge diaphragm is relatively thick, since the diaphragm pressing plate 8 and the water pressing chamber 12 extrude to form a sealing structure with O-ring function, which is used to realize the sealing effect, the middle part of the diaphragm 14 is relatively thin and elastic, the material of the diaphragm 14 adopts nitrile rubber, natural rubber high-elasticity material, the rotor 15 is characterized by an elliptical rotor, and the motion track is as shown in Figure 7As shown, under the drive of the gear shaft and the inner gear ring 6, it rotates along the three-petal outer cycloid, mainly responsible for the work of pressurizing the delivered medium, the structure design of the inner and outer joint of the rotor 15 adopts star-shaped ribs, which has strong torsional capacity and can effectively support the rotor 15 to work externally, the inner side of the gear on the outside of the rotor 15 is provided with a needle bearing 16, the inner side of the needle bearing 16 is provided with a crankshaft 9, one end of the crankshaft 9 is connected with the motor input end, the other end of the crankshaft 9 is connected with the rotor 15 to drive the rotor 15 to rotate along the cycloid trajectory, for extruding the diaphragm 14 to work on the working medium, the two ends of the crankshaft 9 are eccentric, and balance holes are equidistantly arranged on the inner side of the crankshaft 9 for balancing the dynamic and static balance of the crankshaft 9, a key groove is arranged on the outer end of the crankshaft 9 for connecting the motor, the gear on the outside of the rotor 15 is meshingly connected with the inner gear ring 6, the modulus and eccentricity of which are obtained by theoretical calculation, the outside of the inner gear ring 6 is arranged on the inner side of the inner gear ring fixing seat 5 through the fastening screw 7 for fixing the inner gear ring 6 on the inner gear ring fixing seat 5, the fastening screw 7 is very small in size and can be set to different sizes as needed, the smallest can be as large as the palm, mainly subjected to shear force, a cavity is arranged in the inner gear ring fixing seat 5 to allow the crankshaft 9 to pass through with the maximum radius to ensure smooth operation of the crankshaft 9, the outer side of the inner gear ring fixing seat 5 is connected with the corresponding water compression chamber 12 through a plurality of fastening bolts 4, which bears a large tensile and shear force, so the size of the bolt is relatively large, the inner and outer walls of the water compression chamber 12 are both cycloids, which are also the movement trajectory of the rotor 15, the inner wall of the water compression chamber 12 leaves a certain gap with the rotor 15 to ensure that the rotor 15 operates without obstruction, and the gap is also sufficient to ensure that the diaphragm 14 can be accommodated therein, the outer side of the water compression chamber 12 is provided with a fixing block, and the fixing block is used for positioning the inner gear ring fixing seat 5 and providing the fastening depth required by the fastening bolt 4; two bosses are arranged on the top of the water compression chamber 12, and the two bosses are respectively provided with a water inlet and a water outlet, the left side is a water inlet pipeline, and the right side is a water outlet pipeline, since the water inlet and outlet are located at the top end of the water compression chamber 12, the volume swept by the rotor 15 can be pressed out through the water outlet, so its volumetric efficiency is very high, the single water compression volume is almost equal to the volume of the inner cavity of the water compression chamber 12, and the error part is the gap left to ensure operation, the outer side of the boss is respectively provided with a one-way valve 11 for connecting the pump and the pipeline and controlling the flow direction of the working medium, and its working principle is shown in Figure 6The valve consists of a valve body, a spring and a pipe plug ball. When the liquid moves from the ball side to the spring side, the spring is compressed, the ball is pushed up, and the liquid flows from the right side to the left side. When the liquid flows from the left side to the right side, the spring is relaxed, and the ball is blocked by the spring to block the flow channel. At this time, the liquid cannot flow through the pipeline, thereby achieving the control of the flow of the working medium. The advantage of this one-way valve is that it has a simple structure and comes with a pipe thread, which can be directly tightened on the pipe to be connected. A ball roller bearing 3 is provided on the inner side of the inner gear ring fixing seat 5. The radial force is mainly applied here, so a ball bearing is reasonably selected. A bearing end cover 2 is provided on the outer side of the ball roller bearing 3. The inner ring of the bearing end cover 2 contacts the outer ring of the ball roller bearing 3 to play an axial positioning role, and there is a cavity composed of a shaft and a bearing inside for filling grease to ensure the lubrication of the ball roller bearing 3. The bearing end cover 2 is arranged on the inner side of the inner gear ring fixing seat 5 through a plurality of hinged bolts 1. Three pressure The water chamber 12 and the three pressure water chambers 12 are connected by a plurality of fastening bolts 13. The fastening bolts 13 are used to fasten the pressure water chamber 12 and the diaphragm 14. When installing, ensure that they are aligned before tightening the bolts. A plurality of diaphragm pressure plates 8 are provided on the inner side of the edge of the diaphragm 14. The diaphragm pressure plate 8 is used to provide a fastening surface for the connecting bolts 10 of the diaphragm 14. In addition, the diaphragm pressure plate 8 is mainly used to evenly distribute the fastening force of the bolts to the edge of the diaphragm to prevent leakage of the working medium, and plays a similar role to the flange. In addition, several circles of grooves can be added to the outer ring of the diaphragm to form a maze on the sealing surface, thereby enhancing the sealing under specific high-pressure working conditions. However, the diaphragm pump is limited by the performance of the diaphragm 14 and usually does not have a very high operating pressure. Therefore, this scheme temporarily adopts a planar structure, and the diaphragm pressure plate 8, the pressure water chamber 12 and the edge of the diaphragm 14 are connected by a plurality of connecting bolts 10. The pre-tightening force is related to the axial sealing performance of the pump, so it is necessary to ensure that the bolts are tightened evenly. In order to make the present invention applicable to more usage scenarios, there are many alternative solutions: First, in terms of material, the materials of the diaphragm 14 and the chamber can be selected in many ways to adapt to different media. When conveying clean water, natural rubber and cast iron can be used; when conveying oil, nitrile rubber and ductile iron can be used; when conveying edible media, natural rubber and 316 stainless steel can be used; when conveying corrosive media, polyethylene and 2205 stainless steel can be used; During the design process, only a three-chamber structure was designed, but based on the design ideas, a four-chamber or five-chamber structure can also be designed, which also has its unique advantages in some specific occasions.

[0021] To ensure the overall sealing performance, all connections are bolted. This connection method limits the further miniaturization of the present invention. In actual use, if the delivery pressure is relatively low and the medium is relatively safe and cheap, a snap-fit ​​connection can be used. In this way, the product volume can be further reduced and miniaturization can be achieved. Utilize the inner and outer envelope of the triangular rotor machine as the design guide, improve the volumetric efficiency while reducing the weight, reduce the volume; Three-stage pressure water chamber 12 design, enhance the interchangeability; The connection mode can be in series or in parallel, and the same device can realize high and low pressure working conditions at the same time; The working mode is rotary work, the pressure pulsation is small, the reliability is strong, and the flow can be directly controlled by the speed.

[0022] Please refer to the attached Figure 8 The traditional diaphragm pump is mostly single-end or two-end output, so the internal overall pressure distribution changes greatly with the reciprocating of the diaphragm 14, and in the present application, due to the advantages of three-end output, the pressure pulsation is obviously alleviated, and because of the rotary motion, it does not need to overcome the reciprocating inertia work as the reciprocating diaphragm pump, which also makes the operation of the present application more stable and reliable.

[0023] Please refer to the attached Figure 9 The fluid pressure gradually increases in the order of a, b, d, c, in parallel connection, the three pressure water chambers 12 work in turn, and each is connected with input and output pipelines, in the case of not requiring high lift, it can realize large flow output, and because the three-stage pressure water chamber 12 works independently, it can realize three equal parts or equal proportion mixing of the transported medium, in series connection mode, the flow is reduced, but the lift is increased, which can realize high pressure output, suitable for the case of requiring high working pressure, therefore, the present application is suitable for indoor working scene requiring flexible adjustment of flow and lift demand.

[0024] Please refer to the attached Figure 10 The structure design of the present application relies on the outer envelope formed by the eccentric motion of the triangular rotor machine cylinder; the outer envelope curve, and in the present application, the original triangular rotor machine cylinder is used as the rotor 15, and the outer envelope is the cylinder; this design theory not only minimizes the overall volume of the pump, but also ensures the minimization of the clearance volume, i.e. ensures the maximization of the efficiency under the same size, not only that, because the part in the triangular inner envelope does not participate in the whole device operation, the present application tries to remove the part in the inner envelope, which ensures the minimization of the weight, reduces the cost and improves the convenience of use.

[0025] Working principle: During operation, the crankshaft 9 is driven by the motor to rotate, transferring work to the rotor 15, and the rotor 15 directly compresses the medium through the diaphragm 14 to perform work on the medium. In this process, there are mechanical losses caused by friction during transmission and overcoming the tension of the diaphragm 14, clearance volume loss caused by a very small part of the clearance, and hydraulic losses caused by the fluid flowing through various components. In the present invention, since the clearance volume is very small, the volume loss can be basically ignored. Since the chamber is small and the flow channel is short, the hydraulic loss is only an inevitable local loss. Therefore, the efficiency of the present invention is higher than that of traditional large diaphragm pumps. During operation, taking a single chamber as an example, the rotor 15 runs from state 1 to state 5; at moments 1 and 2, the chamber volume gradually decreases, at which point the left one-way valve 11 is closed and the right one-way valve 11 is opened, and the liquid is squeezed out of the chamber, with the flow of the liquid indicated by the red arrow; at moment 3, the volume is reduced to a minimum, with neither water flowing in nor out; and later at moments 4 and 5, the chamber volume begins to increase, at which point the right one-way valve 11 is closed and the left one-way valve 11 is opened, and under the action of the diaphragm 14's own elasticity, the diaphragm 14 begins to reset, thereby forming a vacuum, and the pump begins to absorb water, with the liquid flow indicated by the downward arrow; the three rotors 15 operate alternately, and this cycle repeats, with the working phase difference of 240°; such an operating pattern can reduce the pressure and flow pulses in the pipeline to a certain extent; like Figure 8 As shown, most conventional diaphragm pumps have single-end or double-end outputs, so the overall pressure distribution inside them will vary greatly with the reciprocating movement of the diaphragm 14. In the present invention, due to the advantage of three-end output, the pressure pulsation is significantly alleviated. Moreover, because of the rotational motion, there is no need to overcome the back-and-forth inertia as in a reciprocating diaphragm pump, which also makes the operation of the present invention more stable and reliable. The present invention is compact, lightweight, and can be flexibly placed. Moreover, due to the characteristics of its three-stage water pressure chamber 12, series and parallel switching on the same device can be achieved by switching the pipe connection mode; Figure 9 As shown, the fluid pressure gradually increases in the order of a, b, d, and c. In a parallel connection, the three pressure chambers 12 perform work in sequence, and each is connected to an input and output pipeline. Even when the required head is not large, a high flow rate output can be achieved. Furthermore, since the three pressure chambers 12 perform work independently, the conveyed medium can be divided into three equal parts or mixed in equal proportions. In a series connection, the flow rate is reduced, but the head is increased, enabling a higher pressure output. This is suitable for situations where higher working pressures are required. Therefore, the present invention is suitable for indoor work scenarios where flexible adjustment of flow rate and head requirements is required. Moreover, the three-chamber working environment is relatively independent, any one of the water compression chambers 12 or the diaphragms 14 can be replaced individually, so the degree of modularization is high, and interchangeability is strong; when a fault occurs, a chamber can be replaced individually, which reduces the maintenance and replacement cost in the later period, and is conducive to later maintenance.

[0026] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences, modifications, replacements and variations of the embodiments, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A combined diaphragm pump that can be connected in parallel or in series, comprising a diaphragm (14), characterized in that: The diaphragm (14) is provided with a rotor (15) inside, a needle roller bearing (16) is provided inside the gear outside the rotor (15), a crankshaft (9) is provided inside the needle roller bearing (16), the gear outside the rotor (15) is meshed with an inner gear ring (6), the outer portion of the inner gear ring (6) is provided on the inner side of the inner gear ring fixing seat (5) through a fastening screw (7), the outer portion of the inner gear ring fixing seat (5) is connected to the corresponding water pressure chamber (12) through a plurality of fastening bolts (4), and the inner side of the inner gear ring fixing seat (5) is provided with a ball bearing. The ball roller bearing (3) is provided with a bearing end cover (2) on the outside of the ball roller bearing (3), and the bearing end cover (2) is provided on the inside of the inner gear ring fixing seat (5) through a plurality of hinged bolts (1), three pressure water chambers (12) are provided on the outside of the diaphragm (14), and the three pressure water chambers (12) are connected to each other through a plurality of fastening bolts (13), and a plurality of diaphragm pressure plates (8) are provided on the inner side of the edge of the diaphragm (14), and the diaphragm pressure plates (8), the pressure water chambers (12) and the edge of the diaphragm (14) are connected through a plurality of connecting bolts (10).

2. A combined diaphragm pump that can be connected in parallel or in series according to claim 1, characterized in that: The diaphragm (14) is an integral three-sided diaphragm, the edges of which are relatively thick. Due to the extrusion of the diaphragm pressure plate (8) and the water pressure chamber (12), a sealing structure having an O-ring function is formed to achieve a sealing effect. The middle part of the diaphragm (14) is made of a thinner material and has elasticity.

3. A combined diaphragm pump that can be connected in parallel or in series according to claim 1, characterized in that: The inner and outer wall contours of the three water pressure chambers (12) are all cycloids. There is a certain gap between the inner walls of the three water pressure chambers (12) and the outside of the rotor (15) to ensure that the rotor (15) can run unimpeded, and the gap is also sufficient to ensure that the diaphragm (14) can be accommodated therein.

4. A combined diaphragm pump capable of parallel and series connection according to claim 3, characterized in that: The outer side of the water pressure chamber (12) is provided with a fixing block, and the fixing block is used to position the inner gear ring fixing seat (5) and provide the required fastening depth of the fastening bolt 1 (4).

5. The combined diaphragm pump capable of parallel and series connection according to claim 1, characterized in that: The top of each water pressure chamber (12) is provided with two bosses, each of which is provided with a water inlet and a water outlet. A one-way valve (11) is provided on the outside of each boss for connecting a pump and a pipeline.

6. The combined diaphragm pump capable of parallel and series connection according to claim 1, characterized in that: One end of the crankshaft (9) is connected to the input end of the motor, and the other end of the crankshaft (9) is connected to the rotor (15) to drive the rotor (15) to rotate along a cycloid trajectory, so as to squeeze the diaphragm (14) to perform work on the working medium. The two ends of the crankshaft (9) are not concentric, and balancing holes are equidistantly provided on the inner side of the crankshaft (9) for balancing the dynamic and static balance of the crankshaft (9). The outer end of the crankshaft (9) is provided with a keyway for connecting to the motor.

7. The combined diaphragm pump capable of parallel and series connection according to claim 1, characterized in that: The inner ring gear fixing seat (5) is provided with a cavity inside, allowing the crankshaft (9) to pass through at its maximum radius, thereby ensuring smooth operation of the crankshaft (9).

8. The combined diaphragm pump capable of parallel and series connection according to claim 1, characterized in that: The outer ring of the diaphragm (14) is also provided with several circles of grooves for enhancing the seal under specific high-pressure working conditions. The material of the diaphragm (14) is nitrile rubber, a natural rubber high-elastic material.

Images