Steady-flow diaphragm pump

Abstract

The invention discloses a diaphragm pump, and belongs to liquid conveying equipment. The liquid conveying device is characterized in that the pulsation of liquid is extremely small during conveying, the liquid can be conveyed extremely stably, and vibration and noise are also greatly improved. The multi-cavity diaphragm and multi-roller pressure plate assembly comprises a multi-cavity diaphragm and a multi-roller pressure plate which are combined, so that liquid can be sucked and discharged for multiple times in a rotation period. In the process, the rising edge and the falling edge appear for multiple times and are mutually supplemented, eliminated and counteracted, so that the pulsation is extremely small and even cannot be measured, and the liquid can be stably output. An eccentric wheel structure is omitted, noise is hardly generated, operation is stable, and mute work can be achieved.

Description

Technical Field

[0001] The invention relates to a device for fluid transportation, in particular to a diaphragm pump with extremely small pulsation and capable of stably transporting liquid. Background Art

[0002] At present, the principle of diaphragm pumps for liquid transportation is to compress a soft diaphragm between two cavities. The edge of the diaphragm is sealed and connected to the cavities on both sides. One side of the diaphragm cavity has an inlet check valve and an outlet check valve for sucking and discharging liquid, and the other side has a connecting rod. When working, the motor drives the eccentric wheel, and the eccentric wheel drives the diaphragm to continuously and periodically agitate through the connecting rod, so that the spatial volume of the cavity on the side of the diaphragm with the check valve changes continuously, so that the liquid is sucked and discharged periodically through the inlet check valve and the outlet check valve to achieve the purpose of conveying liquid. Figure 1 .

[0003] Such a structure has a characteristic that the flow of liquid inevitably has a large pulsation. Figure 1 , assuming that the eccentric wheel rotates in the direction shown by the arrow in the figure, then only when the eccentric wheel rotates from 0 to 180 degrees, is the left chamber of the compression diaphragm (the chamber on the side with the one-way valve) Figure 1 The volume of the eccentric wheel is 5), and the liquid can be output through the liquid outlet check valve 3, and this range also includes a rising edge close to 0 degrees and a falling edge close to 180 degrees. The eccentric wheel is in the process of sucking liquid from 180 degrees to 360 degrees, and does not output liquid. It can be seen that within the 360-degree rotation range of the eccentric wheel, there is only one liquid suction and one liquid output, and the range in which the liquid can be output relatively smoothly is very small, and it is relatively stable only within the range of 90 degrees. Figure 2 The flow rate of the liquid output by such a diaphragm pump is directly related to the speed of the eccentric wheel. The higher the speed of the eccentric wheel within a certain range, the greater the flow rate. However, the increase in the speed of the eccentric wheel will increase the vibration and noise. Therefore, due to the structure, the traditional diaphragm pump will inevitably have the disadvantages of large vibration, large noise, and large pulsation of liquid flow. Such a diaphragm pump may not have much impact in general occasions, but for some more precise instruments, the pulsation of the fluid will have a great impact. Summary of the invention

[0004] In order to improve the above shortcomings, the present invention adopts a combination of diaphragms with multiple cavities and pressure plates with multiple rollers, so that multiple liquid inhalation and liquid discharge can be performed in one rotation cycle. In this process, the rising edge and the falling edge appear multiple times, and complement and cancel each other out, so that the pulsation is extremely small or even undetectable, so that the liquid can be output stably. At the same time, since the eccentric wheel structure is eliminated and a multi-roller pressure plate structure with stable operation is adopted, almost no noise is generated, so that the diaphragm pump can operate smoothly and quietly.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] It mainly includes a multi-cavity diaphragm and a multi-roller pressure plate. A multi-cavity diaphragm is a disc-shaped diaphragm with multiple small diaphragms evenly distributed in a convex shape along the circumferential direction, and the other side corresponding to the convexity is sunken to form multiple cavities. A multi-roller pressure plate is a disc-shaped pressure plate body with multiple rollers or protrusions evenly distributed along the circumferential direction. This embodiment uses rollers to illustrate, that is, multiple rollers are embedded on the pressure plate body. The number of cavities in the multi-cavity diaphragm is not the same as the number of rollers in the multi-roller pressure plate, forming an asymmetric distribution. During assembly, the multi-cavity diaphragm and the multi-roller pressure plate are concentrically and relatively installed in a housing. When one of the rollers squeezes one of the diaphragm protrusions, other rollers will squeeze other diaphragm protrusions at the same time. Due to the asymmetric distribution of the number, the degree of squeezing position and the movement trend will not be different. When one is at the rising edge, the other will be at the falling edge, so that they can offset each other, thereby offsetting the pulsation of the liquid, so that the liquid can be smoothly input and output within a rotation cycle. In this way, when the multi-roller pressure plate continues to rotate, a stable liquid output can be achieved.

[0007] The beneficial effect of the present invention is that the diaphragm pump can output liquid very smoothly. Compared with the traditional diaphragm pump, it not only increases the flow rate but also greatly improves the stability of the output. The eccentric wheel is the main factor that produces noise and vibration in the traditional diaphragm pump. The present invention eliminates the eccentric wheel, so the noise can also be greatly reduced, and it can run quietly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the schematic diagram of a traditional diaphragm pump.

[0009] Figure 2 This is the approximate flow output diagram of a traditional diaphragm pump.

[0010] Figure 3 This is a schematic diagram of the appearance and cross-section of a multi-cavity diaphragm.

[0011] Figure 4 This is a schematic diagram of the appearance and cross-section of a multi-roller pressure plate.

[0012] Figure 5 This is a cross-sectional diagram after assembly.

[0013] Figure 6 It is a motion diagram

[0014] Figure 1 Middle: 1 liquid output end, 2 liquid input end, 3 liquid outlet check valve, 4 liquid inlet check valve, 5 left cavity, 6 diaphragm, 7 right cavity, 8 eccentric wheel

[0015] Figure 4 Middle: 9 rollers, 10 pressure plate

[0016] Figure 5 Middle: 11 liquid output end, 12 liquid input end, 13 liquid outlet check valve, 14 liquid inlet check valve, 15 diaphragm valve body, 16 multi-cavity diaphragm, 17 multi-roller pressure plate DETAILED DESCRIPTION

[0017] The following is further described in conjunction with the accompanying drawings:

[0018] See Figure 3 The multi-cavity diaphragm is a disc-shaped body, with multiple (eight in this embodiment) spherical or other shaped protrusions evenly distributed along the circumferential direction on one side of the disc-shaped body, and the other side corresponding to the protrusions is recessed to form multiple cavities. This diaphragm is also an elastic body with strong elasticity, and its spherical protrusions can deform inward when squeezed, and can quickly return to their original shape by their own elasticity when not squeezed.

[0019] See Figure 4 The shape of the multi-roller pressure plate is also a disc-shaped body, and multiple rollers 9 (seven are used as an example in this embodiment) are evenly embedded on the disc body 10 along the circumferential direction. The rollers 9 of the multi-roller pressure plate can be conical wheels or spherical or other shapes, the purpose of which is to squeeze the protrusions on the multi-cavity diaphragm to deform it. This embodiment is described as a cone. Roller 9 is a rigid body. The number of rollers on the multi-roller pressure plate is different from the number of protrusions on the multi-cavity diaphragm, so as to create an asymmetric distribution. In this embodiment, the number of protrusions on the multi-cavity diaphragm is 8, and the number of rollers on the multi-roller pressure plate is 7.

[0020] Figure 5It is an assembly schematic diagram of the present invention. The plane part of the multi-cavity diaphragm 16 is closely attached to the plane of the diaphragm valve body 15. Except for the cavity of the multi-cavity diaphragm 16, the rest of the parts are tightly attached to and sealed with the valve body 15 to form multiple independent cavities. In each cavity, there is a liquid inlet check valve 14 and a liquid outlet check valve 13, and the liquid flow channels of all the liquid inlet check valves 14 are uniformly led out through the channel and connected together to form a liquid inlet, which is connected to the liquid input end 12. Similarly, the liquid flow channels of all the liquid outlet check valves 13 are also uniformly led out through the channel and connected together to form a liquid outlet, which is connected to the liquid output end 11. The protrusion of the multi-cavity diaphragm 16 is installed opposite to the roller of the multi-roller pressure plate 17, and the distance is appropriate, so that each roller can squeeze the protrusion of the multi-cavity diaphragm. One of the multi-cavity diaphragm 16 and the multi-roller pressure plate 17 is fixed, and the other is rotatable. In this embodiment, the multi-cavity diaphragm 16 is fixed on the diaphragm valve body 15 and is immovable, and the multi-roller pressure plate 17 can rotate around its axis under external power. Because the multi-cavity diaphragm 16 is soft and elastic, it will be squeezed and deformed by the rollers. Figure 5 As shown in the upper part, the volume of the cavity inside the protrusion is reduced, which squeezes the liquid out of the liquid outlet check valve 13. When the roller rotates past the protrusion, the protrusion will automatically pop up and suck the liquid from the liquid inlet check valve 14. This cycle repeats.

[0021] Figure 6It is a schematic diagram of the instantaneous position of the multi-cavity diaphragm and the multi-roller pressure plate when they are assembled and moving. The solid line part represents the multi-roller pressure plate, and the solid line trapezoid inside represents the roller on the multi-roller pressure plate. The dotted line part represents the multi-cavity diaphragm, and the dotted small circle inside represents the protrusion on the multi-cavity diaphragm. The solid line numbers in the outer circle represent the serial numbers of the rollers on the multi-roller pressure plate, and the dotted line numbers in the inner circle represent the serial numbers of the protrusions on the multi-cavity diaphragm. It can be seen that within one rotation cycle (360 degrees), there are multiple solid line trapezoids and dotted line circles superimposed on each other, and the degree and position of superposition are different, which means that multiple rollers (solid lines) and the protrusions (dotted lines) of the diaphragm are squeezed against each other at the same time, causing the protrusions to deform. Because the number of protrusions on the multi-cavity diaphragm is different from that of the rollers on the multi-roller pressure plate, the position of each protrusion on the multi-cavity diaphragm being squeezed and deformed is different, and the degree of squeezing is also different, that is to say, the degree of volume change of each cavity in the multi-cavity diaphragm is different, and the trend of change is also different. At the same time, the volume change of some cavities is increasing, and the volume change of some cavities is decreasing; some are on the rising edge, and some are on the falling edge. In this way, in one rotation cycle, multiple liquid inlet processes and multiple liquid suction processes can be carried out simultaneously, and the rising edge and the falling edge offset each other. Since the liquid flow channels of the liquid outlet check valve 13 in each cavity of the multi-cavity diaphragm are connected together and interconnected when they are led out; the liquid flow channels of each liquid inlet check valve 14 are also connected together and interconnected when they are led out, so from the overall perspective of the liquid output end 11, the stability of the liquid flow is greatly increased. At the same time, since multiple rollers on the multi-roller pressure plate are subjected to force, the rotation of the multi-roller pressure plate is also very stable, which greatly reduces vibration and noise.

[0022] The embodiments described in this article are only part of the embodiments of the present invention. The present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Based on the embodiments of the present invention, other embodiments obtained by ordinary persons in the art without creative work are all within the scope of protection of the present invention.

Claims

1. A steady-flow diaphragm pump, comprising a multi-cavity diaphragm and a multi-roller pressure plate.

2. The steady flow diaphragm pump according to claim 1, characterized in that: in, The multi-cavity diaphragm is a disc-shaped body with a plurality of protrusions distributed along the circumferential direction, and the other side corresponding to the protrusion is recessed to form a cavity.

3. The multi-cavity diaphragm according to claim 2, characterized in that: in, The multi-cavity diaphragm is a highly elastic body, and the protrusions on it can be deformed when squeezed, and can quickly return to their original shape by their own elasticity when not squeezed.

4. The steady-flow diaphragm pump according to claim 1, characterized in that: in, The multi-roller pressure plate is a disc-shaped body, on which a plurality of rollers or protrusions are distributed along the circumferential direction.

5. The multi-roller pressure plate according to claim 4, characterized in that: in, The roller on the multi-roller pressure plate is a rigid body.

6. The multi-roller pressure plate according to claim 4, characterized in that: in, The rollers on the multi-roller pressure plate can be conical, cylindrical, spherical, etc.

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