Multi-connected opposed high-flow electric diaphragm pump

Abstract

The invention relates to a multi-linkage opposed high-flow electric diaphragm pump, which belongs to the technical field of diaphragm pumps, and comprises a crankshaft and a pump body, the crankshaft is provided with a plurality of crank throws, the pump body corresponding to each crank throw is provided with a pump cavity symmetrical about the crankshaft, each pump cavity is internally provided with a diaphragm, and the inner side of each diaphragm is provided with a connecting mechanism connected with the crank throw of the crankshaft. The multi-linkage opposed structure comprises the multiple diaphragms and the pump cavities, multiple sets of liquid suction and drainage actions can be conducted at the same time, the liquid conveying amount in unit time is increased, and therefore large-flow output is achieved; the connecting mechanisms at the same crank throw are symmetrically installed, so that horizontal centering installation of the two crank connecting rod mechanisms is achieved, meanwhile, large-area contact of the connecting positions is guaranteed, the power performance of the diaphragm pump is improved, and the service life of the diaphragm pump is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm pumps, and more specifically relates to a multi-connected opposed large-flow electric diaphragm pump. Background Art

[0002] The diaphragm pump relies on the concave and convex deformation of the flexible diaphragm to change the volume of the sealed working chamber to achieve the suction and discharge of the working medium. Since the diaphragm isolates the working medium from the rest of the pump, it protects the internal components of the pump from corrosion or contamination. The diaphragm pump has the advantages of zero leakage, easy maintenance, good self-priming performance, and the ability to transport high-viscosity and special media. It is widely used in chemical, pharmaceutical, food, environmental protection and other fields with high safety and sealing requirements.

[0003] After a lot of research and practice in the diaphragm pump industry, diaphragm pumps are currently available in electric, pneumatic, hydraulic and other power sources, as well as plastic, cast iron, stainless steel and other materials for users to choose from. However, the flow rate of diaphragm pumps has not been significantly improved, and cannot meet the needs of modern industry for leak-free transportation of large-flow media. In theory, the flow rate of diaphragm pumps can be increased by increasing the speed of diaphragm pumps and increasing the diaphragm area. However, increasing the speed of diaphragm pumps will reduce the service life of the pump, and increasing the diaphragm area is limited by material science. Summary of the invention

[0004] The present invention provides a multi-connected opposed large-flow electric diaphragm pump to solve the problems existing in the above-mentioned background technology.

[0005] The present invention provides the following technical solutions: A multi-connected opposed large-flow electric diaphragm pump comprises a crankshaft and a pump body. The crankshaft is provided with a plurality of cranks. The pump body corresponding to each crank is provided with a pump cavity symmetrical with respect to the crankshaft. A diaphragm is provided in each pump cavity. A connecting mechanism connected to the crankshaft crank is provided on the inner side of the diaphragm.

[0006] As a preferred embodiment, a liquid outlet pipe connected to the pump chamber is provided on the top of the pump body, a liquid inlet pipe connected to the pump chamber is provided on the bottom of the pump body, and an outlet check valve and an inlet check valve are respectively provided at the connection between the pump chamber and the liquid outlet pipe and the liquid inlet pipe.

[0007] As a preferred embodiment, the connection mechanism includes a guide rod fixedly connected to the diaphragm, the other end of the guide rod is connected to a connecting rod, the other end of the connecting rod is provided with a limit mechanism to ensure that the connecting rod and the crank pin form a rotating pair, and a rotating pair is formed at the connection between the guide rod and the connecting rod, so as to facilitate the connection and transmission.

[0008] As a preferred embodiment, the limit mechanism includes an upper return half ring and a lower return half ring, the big end of the connecting rod is lined with an arc bearing shell that matches the crank pin, and the upper return half ring and the lower return half ring are pressed on the upper and lower sides of the arc of the big end of the connecting rod respectively. This ensures that the connecting rod bearing shells on both sides are in large-area contact with the crank pin, thereby improving the dynamic performance and service life of the diaphragm pump; it is suitable for heavy loads.

[0009] As a preferred embodiment, the upper return half ring and the lower return half ring are integral structures, and the side walls of the upper return half ring and the lower return half ring are both provided with escape openings for the connecting rod to pass through, so as to facilitate the installation of the arc bearing.

[0010] As a preferred embodiment, the upper return half ring and the lower return half ring are split structures, each of which is composed of two half pressure rings, and the two half pressure rings are symmetrically arranged on both sides of the connecting rod along the crankshaft axis. This facilitates manufacturing and better prevents the upper return half ring and the lower return half ring from interfering with the transmission of the connecting rod.

[0011] As a preferred embodiment, a transmission chamber is provided in the middle of the pump body, and a crankshaft is rotatably installed in the transmission chamber. One end of the crankshaft is connected to a drive motor. A maintenance port is provided on the pump body at the top of the transmission chamber, and a maintenance cover is provided on the maintenance port to close it for easy maintenance.

[0012] As a preferred embodiment, the axes of the revolving pairs formed by the multiple connecting rods and the crank pins are parallel to each other and to the crankshaft axis, and the axes of the revolving pairs formed by the multiple connecting rods and the guide rods are parallel to each other and to the crankshaft axis. The crank pins are distributed at a certain phase angle so that the diaphragms work alternately, effectively reducing the flow pulsation rate.

[0013] As a preferred embodiment, a through hole is provided on the pump body corresponding to the guide rod, a guide rail is provided in the through hole, and a slide groove is provided on the guide rod; the movement directions of the moving pairs formed by the multiple guide rods and the guide rails are parallel to each other, all in the horizontal direction, and located in the same plane.

[0014] As a preferred embodiment, a mounting seat is fixed at the bottom of the pump body, a bottom plate is provided below the pump body, fixing bolts are installed on the bottom plate, and an open groove matching with the fixing bolts is provided on the mounting seat to facilitate quick installation and disassembly.

[0015] Technical effects and advantages of the present invention: The multi-unit opposed structure includes multiple diaphragms and pump chambers, which can perform multiple groups of suction and discharge actions at the same time, increasing the liquid delivery volume per unit time, thereby achieving large flow output; the connecting mechanism at the same crank is symmetrically installed, which not only realizes the horizontal and centrifugal installation of the two groups of crank-connecting rod mechanisms, but also ensures a large area contact at the connection, thereby improving the dynamic performance and service life of the diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a side cross-sectional structural schematic diagram of the present invention; Figure 3 is a structural schematic diagram of the first connection mechanism; Figure 4 is a structural schematic diagram of a second connection mechanism; Figure 5 Schematic diagram of the three-dimensional structure of the crankshaft; Figure 6 Schematic diagram of the axial structure of the crankshaft; Figure 7 for Figure 4 A schematic diagram of a portion of the main structure in FIG. Figure 8 for Figure 7 A schematic diagram of a top view structure; The accompanying drawings are marked as follows: 1. crankshaft; 101. crank; 102. crank pin; 2. pump body; 3. liquid outlet pipe; 4. maintenance cover; 5. mounting seat; 6. bottom plate; 7. liquid inlet pipe; 8. opening groove; 9. pump chamber; 10. diaphragm; 11. lower return half ring; 12. inlet check valve; 13. arc bearing; 14. connecting rod; 15. guide rod; 16. upper return half ring; 17. outlet check valve. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still belong to the scope of protection of the present application.

[0018] Embodiment 1, as Figures 1 to 8 As shown, the present invention is a multi-unit opposed large flow electric diaphragm pump, comprising a crankshaft 1 and a pump body 2, wherein the crankshaft 1 is provided with a plurality of cranks 101, and the pump body 2 corresponding to each crank 101 is provided with a pump cavity 9 symmetrical with respect to the crankshaft 1, and each pump cavity 9 is provided with a diaphragm 10, and a connecting mechanism connected to the crankshaft 1 crank 101 is provided on the inner side of the diaphragm 10. The axes of the crank pins 102 of the plurality of cranks 101 are not coaxial.

[0019] When in use, the crankshaft 1 rotates, driving multiple pairs of diaphragms 10 to reciprocate through the crank 101 and the connecting mechanism connected thereto. When the diaphragm 10 retreats, the volume of the pump chamber 9 increases, forming a partial vacuum, and the fluid is sucked into the pump chamber 9; when the diaphragm 10 pushes outward, the volume of the pump chamber 9 decreases, the pressure increases, and the fluid is discharged from the pump chamber 9. The multi-link symmetrical structure includes multiple diaphragms 10 and pump chambers 9, and can perform multiple groups of suction and discharge actions at the same time, increasing the liquid delivery volume per unit time, thereby achieving a large flow output.

[0020] Embodiment 2, based on Embodiment 1, a liquid outlet pipe 3 connected to the pump chamber 9 is provided at the top of the pump body 2, a liquid inlet pipe 7 connected to the pump chamber 9 is provided at the bottom of the pump body 2, and an outlet check valve 17 and an inlet check valve 12 are respectively provided at the connection between the pump chamber 9 and the liquid outlet pipe 3 and the liquid inlet pipe 7.

[0021] The connecting mechanism includes a guide rod 15 fixedly connected to the diaphragm 10, the other end of the guide rod 15 is connected to the connecting rod 14, and the other end of the connecting rod 14 is provided with a limiting mechanism to ensure that the connecting rod 14 and the crank pin 102 form a rotating pair, and a rotating pair is formed at the connection between the guide rod 15 and the connecting rod 14.

[0022] The limiting mechanism includes an upper return half ring 16 and a lower return half ring 11. The large end of the connecting rod 14 is lined with an arc bearing 13 that matches the crank pin 102. The upper return half ring 16 and the lower return half ring 11 are respectively pressed on the upper and lower sides of the arc of the large end of the connecting rod 14. The upper and lower return half rings are tightly connected by bolts to limit the movement trajectory of the connecting rod 14 and ensure that the connecting rod 14 and the crank pin 102 form a rotating pair.

[0023] The upper return half ring 16 and the lower return half ring 11 are integral structures, and the side walls of the upper return half ring 16 and the lower return half ring 11 are provided with escape openings for the connecting rod 14 to pass through. Figure 3 .

[0024] A transmission cavity is provided in the middle of the pump body 2, and a crankshaft 1 is rotatably installed in the transmission cavity. One end of the crankshaft 1 is connected to a driving motor. A maintenance port is provided on the pump body 2 at the top of the transmission cavity, and a maintenance cover 4 is provided on the maintenance port to close it.

[0025] The axes of the revolving pairs formed by the connecting rods 14 and the crank pin 102 are parallel to each other and to the axis of the crankshaft 1 ; the axes of the revolving pairs formed by the connecting rods 14 and the guide rod 15 are parallel to each other and to the axis of the crankshaft 1 .

[0026] A through hole is provided on the pump body 2 at the position corresponding to the guide rod 15, a guide rail is provided in the through hole, and a slide groove is provided on the guide rod 15; the moving directions of the moving pairs formed by the multiple guide rods 15 and the guide rails are parallel to each other, and are all in the horizontal direction and located in the same plane. The guide rod 15 is constrained by the guide rail to form a moving pair in the horizontal direction; the other end of the guide rod 15 is fixedly connected to the diaphragm 10, driving the diaphragm 10 to perform horizontal reciprocating motion.

[0027] A mounting seat 5 is fixed to the bottom of the pump body 2. A bottom plate 6 is provided below the pump body 2. Fixing bolts are installed on the bottom plate 6. An opening groove 8 matching with the fixing bolts is provided on the mounting seat 5.

[0028] During operation, the drive motor drives the crankshaft 1 to rotate, and the crankshaft 1 drives the diaphragm 10 to reciprocate in the horizontal direction through the upper return half ring 16, the lower return half ring 11, the connecting rod 14, the arc bearing 13 and the guide rod 15. When the diaphragm 10 retreats, the volume of the pump chamber 9 increases, forming a partial vacuum, the inlet check valve 12 opens, and the fluid is sucked into the pump chamber 9; when the diaphragm 10 moves outward, the volume of the pump chamber 9 decreases, the pressure increases, the inlet check valve 12 closes, the outlet check valve 17 opens, and the fluid is discharged from the pump chamber 9.

[0029] Compared with the prior art, the advantages of the present invention are as follows: its symmetrical installation structure not only realizes the horizontal centering installation of two sets of connecting mechanisms, but also ensures the large-area contact between the arc bearings 13 on both sides and the crank pin 102, thereby improving the power performance and service life of the diaphragm pump; the existing double-diaphragm diaphragm pumps basically adopt high-pair mechanisms, such as cam mechanism drive, and the contact area between the parts that transmit power is small, which is easy to wear and fail, and is not suitable for heavy loads. The multi-unit opposed structure includes multiple diaphragms 10 and pump chambers 9, which can simultaneously perform multiple groups of suction and discharge actions, increase the liquid delivery volume per unit time, and thus achieve large flow output; in the multi-unit opposed structure design, each crank pin 102 is distributed at a certain phase angle, so that the diaphragm 10 works alternately, effectively reducing the flow pulsation rate; the connecting rod 14, guide rod 15, diaphragm 10 and other moving parts on both sides of the same crank pin 102 are symmetrically distributed and move in opposite directions, which can effectively offset the force on the crank pin 102 in the horizontal direction, and reduce the vibration and unbalanced force generated in the reciprocating motion. The pump body 2 is provided with a plurality of pump units, and a plurality of pairs of pump chambers 9 are respectively provided on the plurality of pump units, so that each pump unit can be regarded as an independent module. This modular design enables the single module with a problem to be operated during maintenance and overhaul without disassembling the entire pump; when a module fails, maintenance personnel can quickly locate the specific faulty module for repair or replacement without affecting other modules that are working normally, thereby reducing operation and maintenance costs. In addition, the electric diaphragm pump does not require a circulating medium and can ensure a good sealing effect; its reasonable structure and component design reduce the vibration and noise generated during operation.

[0030] Embodiment 3, as Figure 4 , Figure 7 and Figure 8 As shown, different from Example 2, the upper return half ring 16 and the lower return half ring 11 are split structures, and the upper return half ring 16 and the lower return half ring 11 are each composed of two half pressure rings, and the two half pressure rings are symmetrically arranged on both sides of the connecting rod 14 along the axial direction of the crankshaft 1.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0032] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A multi-unit opposed large flow electric diaphragm pump, characterized in that: The pump comprises a crankshaft (1) and a pump body (2), wherein a plurality of cranks (101) are provided on the crankshaft (1), and a pump cavity (9) symmetrical with respect to the crankshaft (1) is provided on the pump body (2) corresponding to each crank (101), and a diaphragm (10) is provided in each pump cavity (9), and a connecting mechanism connected to the crankshaft (1) at the crank (101) is provided on the inner side of the diaphragm (10).

2. A multi-unit opposed large flow electric diaphragm pump according to claim 1, characterized in that: A liquid outlet pipe (3) communicating with the pump chamber (9) is provided at the top of the pump body (2), a liquid inlet pipe (7) communicating with the pump chamber (9) is provided at the bottom of the pump body (2), and an outlet check valve (17) and an inlet check valve (12) are provided at the connection between the pump chamber (9) and the liquid outlet pipe (3) and the liquid inlet pipe (7), respectively.

3. A multi-unit opposed large flow electric diaphragm pump according to claim 1 or 2, characterized in that: The connection mechanism comprises a guide rod (15) fixedly connected to the diaphragm (10); the other end of the guide rod (15) is connected to a connecting rod (14); the other end of the connecting rod (14) is provided with a limit mechanism for ensuring that the connecting rod (14) and the crank pin (102) form a rotation pair; a rotation pair is formed at the connection between the guide rod (15) and the connecting rod (14).

4. A multi-unit opposed large flow electric diaphragm pump according to claim 3, characterized in that: The limiting mechanism comprises an upper return half ring (16) and a lower return half ring (11); the large end of the connecting rod (14) is lined with an arc bearing bush (13) that cooperates with the crank pin (102); the upper return half ring (16) and the lower return half ring (11) are respectively pressed on the upper and lower sides of the arc of the large end of the connecting rod (14).

5. A multi-unit opposed large flow electric diaphragm pump according to claim 4, characterized in that: The upper return semi-ring (16) and the lower return semi-ring (11) are integral structures, and side walls of the upper return semi-ring (16) and the lower return semi-ring (11) are both provided with escape openings for the connecting rod (14) to pass through.

6. A multi-unit opposed large flow electric diaphragm pump according to claim 4, characterized in that: The upper return half ring (16) and the lower return half ring (11) are split structures. The upper return half ring (16) and the lower return half ring (11) are both composed of two half pressure rings. The two half pressure rings are symmetrically arranged on both sides of the connecting rod (14) along the axial direction of the crankshaft (1).

7. The multi-unit opposed large flow electric diaphragm pump according to claim 1, characterized in that: A transmission chamber is provided in the middle of the pump body (2), a crankshaft (1) is rotatably mounted in the transmission chamber, one end of the crankshaft (1) is connected to a drive motor, a maintenance opening is provided on the pump body (2) at the top of the transmission chamber, and a maintenance cover (4) is provided on the maintenance opening to seal the maintenance opening.

8. The multi-connected opposed large flow electric diaphragm pump according to claim 1, characterized in that: The axes of the rotational pair formed by the plurality of connecting rods (14) and the crank pin (102) are parallel to each other and to the axis of the crankshaft (1); the axes of the rotational pair formed by the plurality of connecting rods (14) and the guide rod (15) are parallel to each other and to the axis of the crankshaft (1).

9. The multi-connected opposed large flow electric diaphragm pump according to claim 6, characterized in that: A through hole is provided on the pump body (2) at a position corresponding to the guide rod (15), a guide rail is provided in the through hole, and a slide groove is provided on the guide rod (15); the movement directions of the moving pairs formed by the plurality of guide rods (15) and the guide rail are parallel to each other and are all in a horizontal direction and are located in the same plane.

10. The multi-unit opposed large flow electric diaphragm pump according to claim 1, characterized in that: A mounting seat (5) is fixed to the bottom of the pump body (2), a bottom plate (6) is provided below the pump body (2), fixing bolts are installed on the bottom plate (6), and an opening groove (8) that cooperates with the fixing bolts is provided on the mounting seat (5).

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