WO2013019017A1 - Low pulsation and high capacity diaphragm pump - Google Patents

Abstract

The present invention relates to a diaphragm pump, more specifically to a diaphragm pump which is capable of increasing flux to the same amount of a conventional diaphragm pump while remarkably reducing pulsation.

Description

Low Pulsation High Capacity Diaphragm Pump

The present invention relates to a diaphragm pump, and more particularly, to a diaphragm pump capable of significantly reducing the pulsation while greatly improving the flow rate to the same size as a conventional diaphragm pump.

Diaphragm pump is a device that pumps fluid by converting motor rotational motion into reciprocating motion of diaphragm by using cam or crankshaft. It is widely used for metering of chemicals or drugs because the fluctuation of flow rate discharged for a certain period of time is small. have.

1A and 1B are schematic views for explaining the principle of operation of the diaphragm pump, the diaphragm 110 is installed in the opening of the pump head 100 to form the pumping chamber 120, the diaphragm 110 of the It is opened when it is reversed and becomes a suction passage of fluid, and is opened when the diaphragm 110 is moved forward and the diaphragm 110 is advanced when it is opened and becomes a discharge passage of fluid sucked through the suction valve 130. The discharge valve 140 which is closed when the diaphragm 110 is reversed is installed on the side wall of the pump chamber 120.

When a motor (not shown) is driven to drive the pump, the rotational motion of the motor is changed to the reciprocating motion of the diaphragm and the slider 111 coupled thereto by the eccentric cam, so that the diaphragm 110 moves forward and backward and suctioned. The suction stroke of the fluid through the valve 130 and the discharge stroke of the fluid through the discharge valve 140 are alternately repeated. FIG. 1A shows a state in which the diaphragm is in reverse operation, that is, a suction stroke, and FIG. 1B shows a diaphragm. This forward operation state, that is, the discharge stroke is shown.

As described above, the reciprocating pump, in which the suction and discharge strokes of the fluid are repeated by the reciprocating motion of the diaphragm or piston, has an advantage that the average discharge amount is almost constant for a long time, but, in principle, the pumping action has a suction stroke. And because it is intermittently generated by the discharge stroke, as shown in Figure 2a, there was a fundamental problem that the pulsation phenomenon occurs in the discharged flow rate.

In order to prevent the pulsation phenomenon of the discharge flow rate, a parallel type diaphragm pump that reduces pulsation by varying its stroke by connecting two or more pumps in parallel has been proposed and widely used.

By the way, in the parallel diaphragm pump proposed and applied so far, as shown in FIGS. 3A and 3B, a plurality of pump heads 100a and 100b to which the diaphragm is installed are separately manufactured and installed in parallel, and the motor ( An eccentric cam 113 for linearly reciprocating the diaphragm 101 is provided at the cam shaft 112 driven by 111 at a position corresponding to each pump head, and a slider 102 at one side of the diaphragm 101. ) Is coupled and a bearing part, that is, a cam follower 114, is installed at the other end of the slider so that the slider and the diaphragm coupled thereto are linearly reciprocated as the eccentric cam 113 rotates.

Meanwhile, the suction ports 130a and 130b and the discharge ports 140a and 140b formed in the pump heads 100a and 100b are branched passages 150b, 150c, 160b and 160c, suction pipes 150a and discharge pipes, respectively. It is used to connect to the connection pipe (150, 160) consisting of (160a).

However, such a conventional parallel diaphragm pump has not escaped the idea of simply disposing a plurality of diaphragm pumps in parallel, and as shown in FIG. 2B, since a plurality of pumps are operated alternately, a conventional single pump method ( Although the effect of reducing pulsation can be obtained to a degree compared to FIG. 2A), in order to apply to applications requiring high quantitative properties such as chemical pumps, the pipe configuration is enlarged and a separate pulsation preventing mechanism is installed in the pipe like the single pump method. It was hard to escape the problem of having to.

In addition, even though the overall size is increased as the plurality of pumps are bundled into one, the flow rate is simply proportional to the number of installations of the pump head, so that it is difficult to escape the flow rate limitation of the conventional metering pump.

In addition, the pump head and the cam for driving the diaphragms disposed on each pump head must be manufactured and processed separately, and the frame on which the pump head is installed must also be manufactured to correspond to the arrangement state of the pump head. There is a problem in that manufacturing costs are increased due to high material costs and processing costs.

On the other hand, the inlet and outlet of each pump head must be connected with a connecting pipe consisting of branch line, suction pipe, and discharge pipe, and assembling the connecting pipe at the site where the pump is installed is complicated. Since it has been a factor, the connection pipe itself is manufactured by the pump manufacturer, assembled as a part of the pump and shipped.

Therefore, not only the material cost and the processing cost of the connecting pipes themselves are high, but also the assembly cost for assembling them has been added, which has been a cause of cost increase, and the branch pipes themselves are connected to individual pump heads in which pulsation occurs largely. Therefore, there was a problem that a lot of noise generated by the vibration of the branch pipe during operation of the pump.

The present invention is to solve all the problems of the conventional parallel diaphragm pump as described above, while being manufactured in a similar size to the conventional single-head diaphragm pump in a compact size can significantly reduce the pulsation and at the same time can significantly improve the flow rate The purpose is to provide a type diaphragm pump.

Still another object of the present invention is to provide a parallel diaphragm pump that can be manufactured without a separate connection pipe, which can simplify the manufacturing process and greatly reduce the cost, and can minimize vibration of the pipe during operation of the pump. The purpose is.

According to the present invention, a plurality of pump chambers are formed in a single body, i.e., a single pump head, and are compactly configured. The center of each pump chamber, that is, an end cam surface for arranging the sliders in a concentric circle and driving the sliders on the concentric circles In the case where the slider driving cam is formed in such a position, the diameter of the concentric circle, that is, the diameter of the end cam surface can be sufficiently secured by the arrangement of the plurality of pump chambers, so that the acid (maximum discharge point) and the valley (maximum suction point) are formed on the end cam surface. ) Is based on the idea and the test result that even if the number of strokes of the slider per revolution, that is, the number of strokes is plural, by forming two or more pairs), the operation of the slider can be made smoothly without being caught by the cam surface.

In the parallel diaphragm pump according to the present invention, a plurality of pump chambers in which the diaphragm is installed are installed in parallel, and the suction valve and the diaphragm opened when the diaphragm is opened are opened when the diaphragm is reversed and the valve is opened when the diaphragm is advanced and suction. A discharge valve, which becomes a discharge passage of the fluid sucked through the valve and is closed when the diaphragm is reversed, is installed in communication with the pump chamber. A slider is coupled to one side of the diaphragm, and a bearing part is installed at the other end of the slider. A parallel diaphragm pump having a cam for linearly reciprocating the slider, wherein the plurality of pump chambers are formed in a single body, and the centers of the pump chambers are arranged in concentric circles, and the slider is moved forward and backward. The cam is designed to mount on the plane of the concentric Characterized in that the end cam which is formed a plurality.

According to the present invention, the suction-discharge stroke of each pump chamber is repeated several times within a short time, and the discharge stroke is performed with a time difference between the respective pump chambers, thereby achieving a pulsation breakthrough while having a similar size as a conventional single head diaphragm pump. At the same time, the flow rate can be greatly improved.

In addition, when the pump of the present invention is applied to a high-capacity use where several pumps are conventionally installed, since only one Taiwan is installed as a compact size, a low pulsation and high-capacity pumping operation is possible, so that the installation space in the field is large. It is reduced and is very easy to maintain on site, so it has excellent economy.

Preferably, when the portion between the valleys and the valleys of the end cam is formed asymmetrically, when the predetermined portion of the discharge stroke of each pump chamber is formed to overlap, it was confirmed that the pulsation reduction effect can be further improved.

On the other hand, another feature of the present invention, a plurality of pump chambers are formed in a single body, that is, a single pump head, even if the discharge port corresponding to each pump chamber in communication with a single space, the adjacent discharge port is different by a check valve It is based on a test result that it is closed and does not adversely affect the discharge operation. The discharge space is coupled to one side wall of the pump chamber body to form a discharge space in common communication with a plurality of discharge valves installed in each pump chamber. And a discharge block in which discharge holes communicating with the outside are formed.

According to this feature of the present invention, since the parallel diaphragm pump can be manufactured without a separate connection pipe, the manufacturing process can be simplified, the cost can be greatly reduced, and a pipeline is provided in each pump room where pulsation occurs. Since it is not directly connected, vibration of the pipe line can be minimized when the pump is operated.

According to the present invention, the suction-discharge stroke of each pump chamber is repeated several times within a short time, and the discharge stroke is performed with a time difference between the respective pump chambers, thereby achieving a pulsation breakthrough while having a similar size as a conventional single head diaphragm pump. At the same time, the flow rate can be greatly improved.

In addition, when the pump of the present invention is applied to a high-capacity use where multiple pumps must be installed in the related art, since only one unit is installed as a compact size, a low pulsation high-capacity pumping operation is possible. It is reduced and is very easy to maintain on site, so it has excellent economy.

In addition, since the parallel diaphragm pump can be manufactured without a separate connecting pipe, the manufacturing process can be simplified, the cost can be greatly reduced, and the pump is not directly connected to each pump room where pulsation occurs. The vibration of the city pipeline can be minimized.

1A and 1B are schematic cross-sectional views for explaining the principle of operation of the diaphragm pump, in which FIG. 1A shows an intake stroke and FIG. 1B shows a discharge stroke.

2A is a graph showing the discharge flow rate of the diaphragm pump.

2B is a graph showing discharge flow rates when two diaphragm pumps are used in parallel.

3A is a perspective view showing an example of a conventional parallel diaphragm pump.

3B is an essential part cross-sectional view showing a diaphragm drive of a conventional parallel diaphragm pump.

Figure 4 is an external perspective view of a parallel diaphragm pump according to an embodiment of the present invention.

Figure 5 is a cross-sectional view of a parallel diaphragm pump in accordance with an embodiment of the present invention.

Figure 6a is a perspective view of the end cam applied to the present invention.

Figure 6b is a graph showing an embodiment of the end cam profile and the discharge flow according thereto.

Figure 6c is a graph showing another embodiment of the endcam profile and the resulting discharge flow rate.

Figure 7 is a longitudinal sectional view showing a suction-discharge portion of the parallel diaphragm pump according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The parallel diaphragm pump according to the present invention, as shown in Figure 7, the suction valve 14 is opened when the reverse of the diaphragm becomes a suction passage of the fluid and is closed when the diaphragm advances and the suction valve is opened when the diaphragm is advanced Discharge valve 13, which becomes a discharge passage of the fluid sucked through the diaphragm and is closed when the diaphragm is reversed, is installed in communication with the pump chamber 12, and a plurality of pump chambers 12 in which the diaphragm 11 is installed are installed in parallel. It is similar to the conventional parallel diaphragm pump.

However, as shown in FIGS. 4 and 5, a plurality of pump chambers 12a and 12b are formed in the pump chamber body 10 formed as a single body, and sliders 21a and 21b are provided at one side of the diaphragms 11a and 11b. The bearings 22a and 22b, which are coupled to each other and serve as cam followers, are installed at the other end of the slider, and are disposed to be located at the center of each pump chamber, that is, the diaphragm and the slider concentric circles.

In the present embodiment, a pump having two pump chambers is illustrated as an example for convenience of illustration and description. However, when three or more pump chambers are provided, the centers of all of these pump chambers are arranged concentrically.

The forward and backward operation of the plurality of sliders 21a and 21b is performed by one cam. As shown in FIGS. 6A to 6C, the slider driving cam has a concentric circle in which a pump chamber is disposed at the periphery of the disc-shaped plate. The end 31 is formed of a peak 31 and a valley 32, that is, a maximum discharge point and a maximum suction point along a plane formed to form a smooth curved surface.

The end cam 30 is installed on the camshaft 31 which is rotationally driven by the motor 41, and a plurality of peaks 31 and valleys 32 are respectively provided.

Reference numeral 40 denotes a frame, 41a denotes a motor shaft, 42 and 43 denote transmissions, 23 denotes a spring for providing close contact force between the bearing portion and the cam surface, and 24 denotes a guide rod for stably performing linear movement of the slider. Represent each.

When two pairs of mounts 31 and valleys 32 are installed in the end cam 30, two suction-discharge strokes are performed for each suction chamber per cam shaft rotation, and when three pairs are installed, each cam shaft rotation per cam shaft is performed. Suction-discharge 3-stroke is performed on the suction chamber of. The number of hills and valleys can be appropriately selected according to need, but according to various manufacturing experiments, if the 3-stroke does not affect the operation of the cam, The pulsation reduction and the discharge amount increase effect can be obtained to the required level was confirmed that the most preferable.

Figure 6b is produced in a double pump chamber type formed with two pump chambers, three pairs of hill- valleys in the end cam is installed so that three strokes per rotation of the cam shaft, and the cam follower, that is, the bearing portion is disposed 180 degrees to the end cam The cam profile and the discharge flow rate (Q) curve of FIG. 2 show that the fluid is sucked in the second pump chamber 12b while the fluid is discharged from the first pump chamber 12a (section A), and the second pump chamber 12b is used. The fluid is sucked in the first pump chamber 12a while the fluid is being discharged (Section B), and this action is repeated three strokes per camshaft rotation, so that three discharge strokes are performed in each pump chamber per camshaft rotation. Since six discharge strokes are performed outside the pump, as shown in the discharge flow curve of FIG. 6B, the discharge flow rate increases per unit time, and the upper area between the acid and the acid in the discharge flow rate decreases. The pulsation can be minimized.

In the present embodiment, for the sake of convenience in the description of the drawings, two pump chambers were formed on the basis of the embodiment. Of course, various combinations are possible, such as a four-pump chamber-two stroke and a four-pump chamber-three stroke.

FIG. 6C is a double pump chamber type, in which three pairs of peaks and valleys are installed in the end cam so that three strokes are made per rotation of the camshaft, and the bearing part is disposed at 180 degrees to the end cam, similar to the previous embodiment, but with a cam profile. The embodiment of the present invention is formed so that a portion of the valley between the valleys and the asymmetry is formed so that a predetermined portion of the discharge stroke of each pump chamber overlaps.

In FIG. 6C, at the initial stage when the fluid is discharged from the first pump chamber 12a (section C), the second pump chamber 12b is also discharged from the fluid, and the bearing portion 22b of the second pump chamber picks up the mountain of the cam face. In the section from the passing point P1 to the point P2 where the bearing portion 22a of the first pump chamber passes through the mountain of the cam surface, the fluid is discharged only in the first pump chamber 12a and the suction operation of the fluid is performed in the second pump chamber. As described above, the predetermined stroke of the discharge stroke is overlapped and repeated three strokes per one rotation of the cam shaft.

As can be seen from the discharge flow rate curve of FIG. 6C, according to the present embodiment, the upper area between the acid and the acid of the discharge flow rate becomes smaller than in the previous embodiment, so that the pulsation phenomenon of the discharge flow rate can be further reduced. In addition, the cam profile of the portion between the valley and the hill corresponding to the discharge portion of the end cam was formed in a straight line, it can be seen that the pulsation can be more effectively reduced when formed as a constant velocity cam.

The configuration and operation of the diaphragm drive unit have been described above. Hereinafter, the configuration of the suction discharge unit, which is another feature of the present invention, will be described in detail with reference to FIG. 7.

The parallel diaphragm pump of the present invention can be used by connecting the inlet port and the outlet port of each pump chamber with connection pipes composed of branch lines, suction pipes, and discharge pipes, similarly to the conventional parallel diaphragm pumps. A discharge hole 15b is coupled to one side wall of the pump chamber body 10 so as to form a discharge space 15a which is commonly communicated with a plurality of discharge valves installed in the 12, and communicates with the discharge space. And a discharge block 15 which is present.

The discharge fluid is always filled in the discharge space 15a, and when the suction valve of the pump chamber is opened, the discharge valve is closed, so that the discharge valve is discharged without affecting the inside of the pump chamber of the suction shaft. The fluid in the space 15a is discharged to the outside through the discharge hole 15b.

Although the present embodiment shows an embodiment in which the discharge space 15a is formed by forming a groove inside the discharge block 15, it is also possible to form the discharge space above the portion where the discharge valve of the pump chamber body 10 is installed. Of course it is possible.

The suction side may connect a plurality of suction valve valves installed in the respective pump chambers using a separate branch line as in the related art, but it is preferable that the suction side also has a suction block 16.

The suction block 16, like the discharge block, is coupled to one side wall of the pump chamber body 10 so as to form a suction space 16a which is in common communication with each suction valve, and a suction that communicates with the suction space and the outside. It is comprised by forming the ball 16b.

Claims (5)

A plurality of pump chambers in which the diaphragm is installed are installed in parallel, and the suction passage is opened when the diaphragm is retracted to become a fluid intake passage, and the discharge passage of the fluid which is opened when the diaphragm is advanced and is sucked through the intake valve is opened when the diaphragm is advanced. And a discharge valve which is closed when the diaphragm is closed in communication with the pump chamber, a slider is coupled to one side of the diaphragm, a bearing part is installed at the other end of the slider, and a cam for linearly reciprocating the slider. In the parallel type diaphragm pump provided, Forming the plurality of pump chamber in a single body, The center of each pump chamber is arranged to be located concentrically, And a cam for operating the slider forward and backward is an end cam having a plurality of peaks and valleys formed on a plane of the concentric circle. The method of claim 1, Parallel a diaphragm pump, characterized in that the portion between the valley and the valley of the end cam is formed asymmetrically, so that a predetermined portion of the discharge stroke of each pump chamber overlaps. The method of claim 2, Parallel cam diaphragm pump, characterized in that the cam profile of the portion between the valley and the mountain corresponding to the discharge portion of the end cam is formed in a straight line. The method according to any one of claims 1 to 3, And a discharge block coupled to one side wall of the pump chamber body to form a discharge space in common communication with a plurality of discharge valve valves installed in each pump chamber, and having discharge holes communicating with the discharge space. Parallel diaphragm pump. The method of claim 4, wherein It is further provided with a suction block coupled to one side wall of the pump chamber body to form a suction space in common communication with a plurality of suction valve valves installed in each pump chamber, the suction hole communicating with the suction space and the outside. Parallel diaphragm pump, characterized in that.

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