JP4852191B2 - Micro pulsating flow pump - Google Patents

Description

[0001]
[Industrial application fields]
The disclosed technology belongs to the technical field of the structure of a metering pump that minimizes the pulsation of a plunger that moves forward and backward with respect to a predetermined pipe.
[0002]
[Prior art]
As is well known, pumps are used in many water supply businesses, but the occurrence of pulsation, which can be called the fate of plunger-type metering pumps, not only hinders in-line and continuous processes, but also results in uneven product In many production processes, swirl pumps and gear pumps are still used so far, because various problems such as troubles due to commutation and piping vibration are likely to occur.
[0003]
However, plunger-type pumps are often used because of their large output , durability, and efficiency.
[0004]
[Problems to be solved by the invention]
However, in the plunger type pump, in general, the plunger moves back and forth by a crank mechanism or the like . Therefore, as shown in the series type plunger pulsation type of FIG. 5 (a), the pressure is over the sine curve 1, and the pulsation of the discharge pressure is inevitable . In order to deal with this , as shown in FIG. 5 (b), the forward / backward movement of the plunger is marked with a sine curve as shown by the dotted line 2 with the phase changed by 180 degrees with respect to the normal sine curve 1. In addition, the pulsation is smoothed by advancing and retracting multiple plungers . However , a smooth flow is still not obtained, and if it is triple or more, the number of plungers and valve portions increases, resulting in high costs.
[0005]
Further, a technique has been devised that uses a constant velocity cam to obtain as smooth a discharge pressure as small as possible as shown in FIG. 6, but the portion A overlapping the pressures 3a and 3b has a wave of 3c. Even though it is designed to make the pulsating flow minute, it is still impossible to obtain a completely smooth discharge pressure.
[0006]
As shown in FIG. 7, the plunger 5 connected to the crosshead 4 is fitted with a packing 6 as a countermeasure against the sealing, and the spring 8 is fitted to the crosshead 4 with respect to the fastening force. In order to perform the stroke, the repulsive force of the spring 8 must be larger and stronger than the tightening force of the packing 6. Therefore, naturally, in a pump having a large discharge force, the spring There is a disadvantage that the size of 8 becomes larger and the apparatus becomes larger. Further, the power in the discharge process becomes larger as the compression force of the spring 8 is added to the tightening force of the discharge pressure plus the packing 6 and energy loss occurs.
[0007]
Also, smooth operation can hardly pumping rate is difficult to stably ensure the amount of discharge pump there is drawback that it is difficult to stabilize.
[0008]
In addition, the repulsion operation of the spring 8 is not smooth, and the plunger operation is not smooth.
[0009]
In addition, as shown in FIG. 8, there is a technique in which a pair of plungers 5 'and 5' are moved forward and backward by the solid cam 9 via cam follower rollers 10 and 10. There is a clearance on the surface, and there is an inconvenience that rattling occurs between the discharge process and the suction process, and the pulsation does not become small. In any type, pulsation cannot be completely smoothed, and smooth operation is guaranteed. There was a disadvantage that was not.
[0010]
OBJECT OF THE INVENTION
The purpose of the invention of this application is to solve the problem that the pulsation between the discharge pressure and the suction force through the plunger advancing and retreating by the cam crank system based on the above-mentioned prior art cannot be completely prevented. Also, plate cams are used in the discharge process and the suction process, and both the plate cams are integrally formed or assembled together, so that a large force can be applied to the suction process, so a high discharge pressure or a large diameter plunger, etc. It can be used even when there is large packing friction, and can be processed and molded separately for both the discharge and suction processes, improving manufacturing accuracy, eliminating cam rattling, and suppressing pulsation as much as possible, almost completely It is possible to provide an excellent micro pulsating flow pump that can be used in the field of pump technology in the water conserving industry so that it can be smoothed to a minimum level and can minimize operating power. It is intended.
[0011]
[Means for Solving the Problems]
In order to solve the aforementioned problems, the configuration of the invention of the present application, which is summarized in the scope of the above-mentioned claims along with the above-mentioned object, is that a predetermined number of crossheads connected to a plunger fitted with a packing are used for adjusting the rotational speed. In a micro pulsation pump having a worm gear and linked to a cam crank, the cam crank is integrally formed with a discharge plate cam and a suction plate cam on the cam crank and linked to a cross head pin. The guide plate or groove or slide bearing is arranged in parallel to the head, and the discharge plate cam and the suction plate cam are integrally formed, and the discharge plate cam And a suction plate cam are integrally assembled, and the suction plate cam is attached to a crosshead connected to a predetermined plunger. The plunger is sucked by the suction plate cam via the cam follower roller mounted on the cam. Therefore, the plunger is sucked by the mechanical force of the cam via the bearing, the cross head pin, and the cross head. Even if the tightening force of the jar packing is increased, suction is possible, and a large-diameter plunger that increases the tightening force of the packing is applied to a high-pressure pump. Is.
[0012]
[Action]
In the above-described configuration, when the plunger pump is used in a water supply business or the like, the overall size can be reduced even if the tightening force of the packing or the like is large, and the cam crank is discharged to the cam crank. The suction plate cam moves the crosshead and plunger via the crosshead pin from the cam follower roller mounted in contact with the inside so that the plate cam for suction and suction can be integrally formed or assembled together. However, since the suction force acts as a cantilever force from the cam follower roller to the cross head pin, the suction force is a force that rotates the cross head pin and the cross head in a minute inclined ridge.
[0013]
Therefore, in order not to rotate the crosshead, a guide plate or a groove or a slide bearing is provided in the crosshead, and the side of the push cam is used as a guide to prevent the crosshead from rotating. This ensures that proper operation can be guaranteed.
[0014]
Note that the guide plate is attached to a simple and inexpensive method for the crosshead to move normally and smoothly. A guide plate, a groove or a slide bearing is attached to the crosshead, or a square shape is used. Therefore, the object can be achieved and falls within the scope of the invention of this application.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
Illustrated embodiments Ru aspect der plunger pump used in pumping the appropriate irrigation operations.
The embodiment shown in FIG. 1 is a cross-sectional view showing the main part of a micro pulsating flow plunger pump according to the invention of this application. A plunger 25 facing a pipe (not shown) is connected to a crosshead 24 . The crosshead 24, crosshead pin 30 of the spline-type is provided. A cam follower roller 33 in contact with the discharge cam 31 and a cam follower roller 53 in contact with the suction cam 51 are mounted on the cross head pin 30 . The discharge cam 31 and the suction cam 51 are connected to a rotating shaft 64 so that the discharge can be performed by pressing the cross head 24.
[0017]
In addition, 3 is a valve | bulb part.
[0018]
Further, the cross head 24 may be provided with guide plates 7a and 7b, grooves, or a slide bearing 23 shown in FIG. The suction cam 51 is provided with a suction cam groove 52 inside the flange, and a cam follower roller 53 is provided in the cam groove 52.
[0019]
Therefore, the cross head 24 is linked to the pushing cam 31 and is also linked to the suction cam 51, and the pressing action is performed by the pushing discharge cam 31. The action is performed by the cam follower roller 53 of the cam 51.
[0020]
Therefore, in this mode, no spring is provided as in the conventional mode for suction.
[0021]
Of course, the suction cam follower roller 53 is equipped with a bearing.
[0022]
Then, the cam 31 for discharging the suction cam 51 is to be able to rotate by the rotating shaft 63 and 64 as one block by integral molding.
[0023]
2A and 2B show the operational relationship of the push cam 31, the cam follower roller 33, the suction cam 51, and the cam follower roller 53.
[0024]
In the extruding process, the cam follower roller 33 is pressed against the extruding cam 31 at point A to push out the cross head 24 via the cross head pin 30 and the extrusion is finished at point B. Next, at point C, the suction cam 51 and the cam follower are pushed. The roller 53 comes into pressure contact and starts sucking the cross head 24 through the cross head pin 30. The suction ends at the point D , and the continuous operation is repeated for the point A extrusion process.
[0025]
The shape of the pressure contact surface of the push-out cam 31 is designed to perform a constant speed motion, and the cam groove 52 of the suction cam 51 is formed so as to follow the constant speed motion of the push-out cam 31 from point C to point D. .
[0026]
Therefore, the action of the suction cam 51 is from point C to point D, and may be in the form of Z. However, the cam follower roller 53 has a disk shape as shown in FIG. 2 in order to smoothly enter the cam groove 52 and to provide strength.
[0027]
Note that a cam groove 52 is recessed inside the suction cam 51 for the crosshead and is inscribed in the cam follower roller 53.
[0028]
In addition, since the guide plates 7a and 7b are provided so as to cover the discharge cam 31, and because the guide plates 7a and 7b are provided on the cross head 24, the guide plates 7a and 7b operate smoothly even during the high-frequency advancement and retraction thereof. It does not tilt or rotate.
[0029]
Thus, the embodiment shown in FIGS. 1 and 2 is used for a one-unit type plunger pump. However, the embodiment shown in FIG. Reference numeral 51 denotes an axial direction whose phase is changed by 180 degrees so that pulsation in the piping is made as smooth as possible. Each mechanism is integrally connected by a single frame, and the packing 6 is The rotating shaft 63 is connected to a motor (not shown) via a coupling, and is connected to a cam from the rotating shaft 64 via a reduction worm gear 67 and a worm wheel 68. It is connected to 31, 51 and functions as a pump.
[0030]
In this embodiment, reference numeral 27 denotes a bearing that performs a bearing action on the cross head 24.
[0031]
Of course, the embodiments of the invention of this application are not limited to the above-described embodiments, and various modes such as, for example, each cam being an integral cam can be adopted.
[0032]
Of course, the pump of the invention of this application can be applied not only to the plunger pump but also to a diaphragm pump and the like.
[0033]
The discharge cam and the suction cam may be formed integrally, but it is of course possible to form them separately so that they can be integrally formed by an assembling operation. That is.
[0034]
When adjusting the straw length, it is extremely easy for those skilled in the art to adjust the stroke length by linking a suitable gear mechanism and link mechanism to the cross head 24 through rotation of a handle (not shown).
[0035]
【The invention's effect】
As described above, according to the invention of this application, basically, in the plunger pump, the constant speed cam acting on the cross head integrally forms the push and suction cams and changes the phase thereof. By using a continuous pump, the pulsation can be suppressed as much as possible, and the suction cam of the crosshead is integrated with the discharge cam even if the tightening of the packing is considerably increased and the sealing capacity is increased. Therefore, a powerful suction action is performed, and therefore, an excellent effect that a plunger pump with a minute pulsation can be obtained.
[0036]
Therefore, the force for driving the pump is also averaged and reduced.
[0037]
In addition, since the cam can be manufactured and processed separately for discharge and suction, the cam can be molded with extremely high accuracy, and there is no backlash of the cam, so that the pulsation can be suppressed as much as possible.
[0038]
The plunger pump of the invention of this application is usually a two-unit type, but by using a multi-unit pump of three or more units, the pulsation can be suppressed very minutely and an excellent effect can be obtained that a smooth output can be obtained. Played.
[0039]
Further, since it is not necessary to use a spring or the like for the suction of the plunger pump in the conventional mode, the spring does not have to be large-sized with a force greater than the tightening force of the packing, and the device can be made compact and bulky. There is an advantage that it is cheap and cheap.
[0040]
In addition, a conventional pump provided with a suction spring requires extra force to compress the suction spring at the time of discharge, and there is power loss. The invention of this application is an energy-saving type that solves this problem. I can say that.
[0041]
Further, since the discharge cam and the suction cam are integrally connected via the cross head, the durability of both the cams through the bearings is equal and there is an advantage that maintenance and the like can be easily performed. Thus, there is an excellent effect that durability is good due to smooth contact by disposing a guide plate or groove or a slide bearing on the contact surface of the cross head or the side surface of the cam. .
[0042]
Further, as in the past, there is a merit that the mechanism is physically simplified because it is not necessary to provide a negative earning facility such as an accumulator or an air chamber, and the cost is low.
[0043]
Depending on the design of the discharge cam and the suction cam, the pulsation can be made very small, and there is an effect that a pump having almost no pulsation can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a diagram showing operations of a cam and a cross head.
FIG. 3 is a cross-sectional view of a two-connection type.
FIG. 4 is a longitudinal sectional view of the same.
FIG. 5 is a pressure change diagram of one cycle based on the prior art, (A) is a monocycle graph, and (B) is a reverse transfer monocycle graph.
FIG. 6 is a smoothing graph of a composite piston cycle.
FIG. 7 is a longitudinal sectional view of a basic concept of a plunger pump based on the prior art.
FIG. 8 is a side view of a plunger pump using a three-dimensional cam based on the prior art.
FIG. 9 is a schematic view of a slide bearing.
[Explanation of symbols]
4 Crosshead
5 Plunger
5 'Plunger
6 Packing
7a Guide plate
7b Guide version
8 Spring
9 3D cam
10 Cam Follower Roller
11 Tightening screw
13 Cam Follower Roller
23 Slide bearing
24 Crosshead
25 Plunger
27 Bearing
30 Crosshead pin
31 Discharge cam
33 Cam Follower Roller
51 Suction cam
52 Cam groove
53 Cam Follower Roller
63 Rotating shaft
64 Rotating shaft
67 Worm gear for reduction
68 Worm Wheel

Claims (1)

A pump used in a multiple pump device that continuously pumps fluid,
A crosshead (24) having a pin (30) forming a rotation axis and connected to a plunger;
Two coaxial cam follower rollers (33) (53) pivotally supported by the pin (30) of the crosshead;
A plate cam for discharge (31) for pushing out the cross head (24) through one cam follower roller (33) ;
A suction plate cam (51) for pulling the cross head (24) through the other cam follower roller (53) ,
The discharge plate cam (31) and the suction plate cam (51) are integrally formed , and start pulling at the end of pushing out the cross head (24), and push out at the same time as pulling ends. Configured to start,
A micro pulsating flow pump characterized in that a guide plate (7a) (7b) for preventing displacement of the plate cam (31) with respect to the cam follower roller (33) is provided in the cross head (24). .

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