JP3763489B2 - Diaphragm pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improved structure for adjusting the injection amount of a diaphragm pump provided for injecting a chemical into soil in a soil disinfecting apparatus pulled by a tractor, a management machine, or the like.
[0002]
[Prior art]
Conventionally, a structure in which a diaphragm pump is attached to a soil disinfecting device towed by a tractor or a management machine has been publicly known, and is disclosed in, for example, Japanese Patent Laid-Open No. 4-325047.
There are also known examples as shown in FIGS. (The structure of the diaphragm pump shown in FIGS. 5 and 6 will be described in detail in the description of the embodiment of the invention later.)
In these known examples, a connecting member is vertically suspended from the diaphragm, and a cam follower is disposed at the lower end thereof, and reciprocatingly expands and contracts in accordance with the movement of the cam follower that moves up and down by the cam motion. It has a structure.
The adjustment of the discharge amount is an adjustment of the vertical position of the cam follower. Therefore, the connecting member between the diaphragm and the cam follower is moved up and down. If the position of the cam follower is brought closer to the diaphragm side, the operating range of the cam follower is narrowed accordingly, the amount of expansion and contraction of the diaphragm is reduced, and the discharge amount can be reduced.
[0003]
[Problems to be solved by the invention]
In the conventional adjustment of the discharge amount, when the position of the cam follower is changed, the connecting member moves up and down accordingly, so that the diaphragm is deformed regardless of reciprocating expansion and contraction during operation. That is, when the discharge amount is reduced, the diaphragm is pushed into the valve side, and during the discharge operation, the diaphragm reciprocates from this deformed state, so the discharge amount is not stable. In addition, depending on the stop position of the cam, the diaphragm will stop in a state where it is extremely pushed in. If it is stored for a long time in this state, the diaphragm itself will be fatigued and the discharge amount will change when it is reused. There was a problem that.
[0004]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above problems.
[0005]
A diaphragm-type pump P that sucks and discharges liquid by reciprocating expansion and contraction of the diaphragm 5, and has a connecting shaft 17 at one end as a swinging fulcrum and the other end connected to the connecting rod 7 of the diaphragm by a pivot shaft 10. The movable arm 8 has a cam follower 20 in the middle of the swing arm 8, the cam follower 20 is brought into contact with the drive cam 19, and the connecting rod 7 to the diaphragm 5 of the swing arm 8 is connected. In the configuration in which the diaphragm 5 is reciprocated and reciprocated by reciprocatingly swinging the shaft, the connecting shaft 17 that is the swinging fulcrum of the swinging arm 8 is moved in accordance with the rotation operation of the amount adjusting screw rod 15. 15, a pointer 17 b is attached to the end of the connecting shaft 17 on the pump case 1 side, a confirmation window 1 a is provided on a side surface of the pump case 1, and the pointer is formed along the confirmation window 1 a. Top and bottom of 17b It is provided with a dial 1b to confirm.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall side view of a tractor-type soil disinfecting machine equipped with a diaphragm pump P of the present invention, and FIG. 2 is a common diaphragm driving pump P of the present invention and a diaphragm pump P of the present invention with a common cam drive shaft. 3 is a rear perspective view showing a state in which the diaphragm pump is juxtaposed, FIG. 3 is an inner side view of the diaphragm pump P of the present invention, FIG. 4 is an inner front view of the same, and FIG. 5 is an inner side view of a conventional diaphragm pump P ′. FIG. 6 is also an internal front view.
[0007]
First, referring to FIG. 1, a configuration in which the diaphragm pump of the present invention is used as a disinfecting liquid injection pump and mounted on a management machine pulling type soil disinfecting machine will be described.
The front end of the frame 40 is a mounting portion 40b for the management machine, and the chemical solution tank T is mounted on the frame 40 at the rear. An injection claw 41 is suspended below the portion where the chemical liquid tank T is mounted, and a chemical liquid nozzle N is attached to the injection claw 41. A mounting pipe 40a is installed in the left-right direction behind the mounting portion of the chemical liquid tank T in the frame 40, and one or a plurality of diaphragm pumps P of the present invention as a disinfecting liquid injection pump are arranged in parallel in the left-right direction. It is installed. From the diaphragm pump P, a suction valve 2 and a discharge valve 3 are projected upward. A suction pipe 42 is connected to the suction valve 2 from a chemical tank T. Is provided with a discharge pipe 43 in the chemical nozzle N.
[0008]
Drive wheels 44 are pivotally supported on the left and right sides of the frame 40 where the diaphragm pump P is mounted. As will be described later, the diaphragm type pump P is provided with a cam drive shaft 18, which may be formed by an axle 45 that connects the left and right drive wheels 44. 3 and 4, a cam shaft driving motor M may be separately attached, and the cam driving shaft 18 may be extended from the motor shaft (output shaft of the reduction gear case G).
[0009]
Next, before explaining the diaphragm pump P of the present invention, a conventional diaphragm pump P ′ will be described with reference to FIGS. 2, 5 and 6.
At the upper end of the pump case 23 of the conventional diaphragm type pump P ′, a valve mounting member 26 is disposed, the intake valve 24 and the discharge valve 25 are projected upward, and the diaphragm 27 is sandwiched from above and below. The valve mounting member 26 and the diaphragm mounting member 28 support the diaphragm 27 so that the diaphragm 27 can be vertically expanded and contracted between the valve mounting member 26 and the diaphragm mounting member 28.
The diaphragm mounting member 28 is supported from below by a diaphragm support member 29 that is installed on the left and right sides in the pump case 23. A connecting rod 30 is suspended below the lower end of the diaphragm 27 so as to penetrate the diaphragm mounting member 28 and the diaphragm supporting member 29, and a cam follower supporting member 31 is fixed to the lower end thereof. The cam follower 32 is pivotally supported by this. A return spring 33 is wound around the connecting rod 30 between the diaphragm support member 29 and the cam follower support member 31, and the cam follower 32 (connecting rod 30) is biased downward.
[0010]
A cam drive shaft 34 is horizontally supported at a position below the cam follower 32 (as described above, the cam drive shaft 34 may be constituted by the axle 45 of the drive wheel 44 of the soil disinfecting machine, or provided separately. The output shaft of the motor may be extended.) A drive cam 35 is fixed to the cam drive shaft 34 so as to abut the cam follower 32. Further, a boss member 36 is loosely fitted on the cam drive shaft 34, and a quantity adjusting cam 37 is fixedly provided on the boss member 36 so as to contact the lower end of the cam follower support member 31. is doing. Further, one end of an amount adjusting lever 38 is fixed to the boss member 36, and the other end of the amount adjusting lever 38 is protruded to the outside of the pump case 23 and is provided with an amount adjusting knob 39. The amount adjusting lever 38 protrudes from a guide groove 23a formed in an arc shape in the pump case 23 in a side view, and a scale plate 23b is disposed along the guide groove 23a.
[0011]
First, the expansion / contraction operation of the diaphragm that reveals the discharge operation of the chemical solution will be described.
As the cam drive shaft 34 is driven to rotate, the drive cam 35 rotates integrally, and accordingly, the cam follower 32 rotates and moves up and down. Due to this vertical movement, the connecting rod 30 moves up and down, whereby the diaphragm 27 reciprocates vertically. When the diaphragm 27 extends downward, the suction valve 24 opens, the chemical liquid is sucked into the diaphragm 27 from the chemical tank T, and when the diaphragm 27 contracts upward, the discharge valve 25 opens, and the chemical liquid The chemical liquid is discharged to the nozzle N.
[0012]
Next, the adjustment of the discharge amount will be described.
When adjusting the discharge amount, the amount adjusting knob 39 is grasped and the amount adjusting lever 38 is rotated. The boss member 36 and the amount adjusting cam 37 are rotated integrally therewith. As the position is adjusted by the turning operation, the cam follower support member 31 that contacts the amount adjusting cam 37 moves up and down. Here, considering the case where the amount adjusting lever 38 is rotated downward in order to reduce the discharge amount, the long diameter portion of the fan-shaped amount adjusting cam 37 comes into contact with the cam follower support member 31, and the cam The follower support member 31 moves upward. As a result, the connecting rod 30 also moves upward, and the diaphragm 27 is pushed upward. From this state, the cam follower 32 reciprocates as the drive cam 35 follows the cam follower 32. However, since the cam follower support member 31 moves upward, the cam follower 32 moves little downward. Therefore, the vertical reciprocation amount is reduced, and the vertical reciprocation movement amount of the diaphragm 27 is also reduced. As a result, the opening degree and opening time of the suction valve 24 and the discharge valve 25 are reduced, and the discharge amount is reduced.
[0013]
The above is the configuration of the conventional diaphragm pump P ′. Next, the configuration of the diaphragm pump P of the present invention will be described with reference to FIGS.
A notch is provided at the lower end of the pump case 1, and the notch is fitted to the upper end of a mounting pipe 40 a disposed in the left-right direction on the frame 40 of the soil disinfecting machine and mounted on the frame 40. I am doing so. At the upper end of the pump case 1, a diaphragm 5 is sandwiched from above and below by a valve mounting member 4 that projects the suction valve 2 and the discharge valve 3 upward, and a diaphragm mounting member 6. The lower part of the diaphragm 5 is suspended so as to penetrate the diaphragm mounting member 6 and is inserted into the pump case 1. A connecting rod 7 is suspended from the lower end of the diaphragm 5, and the connecting rod 7 is sandwiched from the left and right by the swinging arms 8, 9. The connecting rod 7 is pivotally supported. The swing arm 9 extends forward from a pivotal support portion to the connecting rod 7 by the pivot shaft 10, and returns from this extended portion to a spring receiving portion 12 provided at the lower end of the pump case 1. The spring 11 is connected and the connecting rod 7 is biased downward, that is, the diaphragm 5 is biased downwardly extending. Further, a stopper 13 is disposed on the inner surface of the pump case 1 below the extended portion of the swing arm 9 to restrict the downward swing amount of the extended portion.
[0014]
On the other hand, a pivot member for adjusting the amount is fixed on the side surface of the rear end of the pump case 1, and the amount adjusting screw rod 15 having a screw groove is rotatably supported in the vertical direction. The upper end of the pump case 1 protrudes upward from the upper end of the pump case 1, and an amount adjusting knob 14 is attached. A connecting shaft 17 is interposed between the rear ends of the swing arms 8 and 9, and a female screw 17 a penetrating in the vertical direction is formed in the connecting shaft 17. The amount adjusting screw rod 15 is passed through 17a. When the amount adjusting screw 14 is held and the amount adjusting screw rod 15 is rotated, the connecting shaft 17 with which the female screw 17a engages with the amount adjusting screw rod 15, that is, the rear ends of the swing arms 8 and 9, It slides up and down along the amount adjusting screw rod 15. A pointer 17b is attached to the rear end of the connecting shaft 17. On the other hand, a confirmation window 1a is provided on the rear surface of the pump case 1, so that the vertical position of the pointer 17b can be confirmed. Yes. A scale plate 1b is provided along the confirmation window 1a.
[0015]
A cam drive shaft 18 is horizontally supported at a lower portion in the pump case 1. In the diaphragm type pump P, as shown in FIGS. 3 and 4, a drive motor M and a reduction gear case G are connected and fixed to the outer surface of the pump case 1, and the output shaft of the reduction gear case G is camped. As shown in FIG. 2, the drive shaft 18 is disposed in the pump case 1 without the drive motor M and the reduction gear case G, and the cam drive shaft 18 is replaced with the cam drive shaft 18 (see FIG. 2 is connected to the cam drive shaft 34) of the conventional diaphragm pump P ′ via the extension pipe 22. When a plurality of diaphragm pumps P are arranged side by side, one is a motor-equipped type shown in FIGS. 3 and 4, and the others are arranged in parallel with a plurality of configurations shown in FIG. 2 to share a cam drive shaft. What should I do?
[0016]
In the pump case 1, the cam drive shaft 18 is provided with a drive cam 19 on the cam drive shaft 18, and both swinging arms 8, 9 are in contact with the drive cam 19 above the drive cam 19. The cam follower 20 is pivotally supported by a pivot shaft 21 so as to be sandwiched therebetween.
[0017]
In the above configuration, first, the discharge operation by the vertical reciprocation of the diaphragm 5 will be described.
As the cam drive shaft 18 is driven to rotate, the drive cam 19 rotates, and the cam follower 20 in contact with the cam drive shaft 20 rotates following and rotates up and down. Accordingly, the swinging arms 8 and 9 swing up and down on the front end side with the connecting shaft 17 at the rear end as a swinging fulcrum, and reciprocate the connecting rod 7 pivotally supported on the front end side. As a result, the diaphragm 5 reciprocates vertically. Thereby, the suction valve 2 and the discharge valve 3 are opened and closed to perform the discharge operation.
[0018]
Next, with regard to the adjustment of the discharge amount, as described above, the amount adjustment knob 14 is rotated to adjust the rear end position of the swing arms 8 and 9 up and down. When the rear ends of the swing arms 8 and 9 are raised upward (the hands 17a are moved upward) to reduce the discharge amount, the position of the pivot shaft 21 of the cam follower 20 on the swing arms 8 and 9 is moved upward. Therefore, since the downward movement amount of the cam follower 20 accompanying the rotation of the drive cam 19 is reduced, the vertical reciprocation amount of the cam follower 20 is reduced. Accordingly, the amount of vertical reciprocation of the connecting rod 7 pivotally supported on the rear end side of the swing arms 8 and 9 is reduced, and the amount of vertical expansion and contraction of the diaphragm 5 is also reduced. Thereby, the valve opening degree and valve opening time of the suction valve 2 and the discharge valve 3 are also reduced, and the discharge amount is reduced.
[0019]
A comparison will be made between the conventional diaphragm pumps P and P ′ of the present invention having the above-described configuration. When adjusting the discharge amount, especially when reducing the discharge amount, it is common to move the cam follower position upward to reduce the vertical reciprocation of the cam follower as the drive cam rotates. . However, in the case of the conventional diaphragm type pump P ′, the connecting rod 30 moves upward as the cam follower 32 moves upward, and the diaphragm 27 is pushed upward. It is up and down reciprocating motion. On the other hand, in the diaphragm pump P of the present invention, it is the rear end portion of the swing arms 8 and 9 that moves up and down when adjusting the amount, and the connecting rod 7 pivotally supported by the front end portion moves up and down. do not do. That is, when the swing arm 8 or 9 swings due to the rotation of the drive camshaft 18, the rear end portion becomes the swing fulcrum and the rear end portion becomes the swing action portion. The rear end portion is swung, and the swing support point at this time is the pivot shaft 10, which does not move up and down. Accordingly, the diaphragm 5 is not pushed upward in accordance with the amount adjustment work (reduction of the discharge amount). Therefore, the diaphragm 5 is not deformed in accordance with the amount adjustment, the discharge amount is stabilized, the fatigue progress of the diaphragm 5 is also delayed, and the state where the discharge is correctly performed with the set amount indicated by the pointer 17a is prolonged. Maintain time.
[0020]
Further, as can be seen from FIG. 2, in the conventional diaphragm type pump P ′, the pump case 23 is enlarged in order to secure the rotation range of the amount adjusting lever 38. However, in the diaphragm type pump P of the present invention, Only the rear ends of the swing arms 8 and 9 move in accordance with the amount adjustment, and the amount adjustment screw rod 15 itself rotates and does not change its position. Therefore, the pump case 1 can be made compact as illustrated.
[0021]
【The invention's effect】
Since the diaphragm pump is configured as described above, the present invention has the following effects.
A diaphragm-type pump P that sucks and discharges liquid by reciprocating expansion and contraction of the diaphragm 5, and has a connecting shaft 17 at one end as a swinging fulcrum and the other end connected to the connecting rod 7 of the diaphragm by a pivot shaft 10. The movable arm 8 has a cam follower 20 in the middle of the swing arm 8, the cam follower 20 is brought into contact with the drive cam 19, and the connecting rod 7 to the diaphragm 5 of the swing arm 8 is connected. In the configuration in which the diaphragm 5 is reciprocated and reciprocated by reciprocatingly swinging the shaft, the connecting shaft 17 that is the swinging fulcrum of the swinging arm 8 is moved in accordance with the rotation operation of the amount adjusting screw rod 15. 15, a pointer 17 b is attached to the end of the connecting shaft 17 on the pump case 1 side, a confirmation window 1 a is provided on a side surface of the pump case 1, and the pointer is formed along the confirmation window 1 a. Top and bottom of 17b Is provided with the dial 1b to confirm, during adjustment of the discharge amount, it is possible to position variation of the portion to be a rocking fulcrum when the swing by the cam follower up and down movement of the swing arm, thereby, the middle The position of the cam follower can be changed to adjust the amount of reciprocation of the diaphragm. On the other hand, the position of the connecting end of the swing arm to the diaphragm does not change when the amount is adjusted. There is no deformation.
Therefore, there is no situation where the pump is driven back and forth from the deformed state, so that the discharge amount is stable, and it is also possible to avoid storing the diaphragm while it is deformed for a long time, thereby making the diaphragm fatigued. It is possible to provide a good diaphragm pump that can avoid and obtain a set discharge amount for a long time. Therefore, it can be installed in a device that discharges liquid, such as a tractor or a soil disinfector for traction of a management machine, etc. Injection work).
[0022]
Further, only the swing fulcrum portion of the swing arm that slides along the screw rod moves in the amount adjustment, and the screw rod does not change its position only by rotating.
Therefore, unlike the prior art, in order to change the cam follower position for adjusting the amount, it is not necessary to provide a rotation range of the lever, and the entire diaphragm pump can be made compact.
Therefore, it contributes to the downsizing of the apparatus equipped with such a pump.
In particular, the effect of downsizing is enhanced for an apparatus equipped with a plurality of pumps.
[Brief description of the drawings]
FIG. 1 is an overall side view of a management machine tow type soil disinfecting machine equipped with a diaphragm pump P of the present invention.
FIG. 2 is a rear perspective view showing a state in which a diaphragm pump P of the present invention and a conventional diaphragm pump P ′ are arranged in parallel with a common cam shaft.
FIG. 3 is an internal side view of the diaphragm pump P of the present invention.
FIG. 4 is an internal front view of the same.
FIG. 5 is an internal side view of a conventional diaphragm pump P ′.
FIG. 6 is an internal front view of the same.
[Explanation of symbols]
P Diaphragm type pump 1 Pump case 2 Suction valve 3 Discharge valve 5 Diaphragm 7 Connecting rod 8 Oscillating arm 9 Oscillating arm 10 Pivoting shaft 14 Quantity adjusting knob 15 Quantity adjusting screw rod 17 Connecting shaft 17a Female screw 17b Pointer 18 Cam drive Shaft 19 Drive cam 20 Cam follower 21 Pivot shaft

Claims (1)

A diaphragm-type pump P that sucks and discharges liquid by reciprocating expansion and contraction of the diaphragm 5, and has a connecting shaft 17 at one end as a swing fulcrum and the other end connected to the connecting rod 7 of the diaphragm by a pivot shaft 10. The swing arm 8 is provided with a cam follower 20 in the middle of the swing arm 8, the cam follower 20 is brought into contact with the drive cam 19, and the connecting rod 7 to the diaphragm 5 of the swing arm 8 is connected. In the configuration in which the diaphragm 5 is reciprocated and reciprocated by reciprocatingly swinging the shaft, the connecting shaft 17 that is the swinging fulcrum of the swinging arm 8 is moved along the rotational operation of the amount adjusting screw rod 15. 15, a pointer 17 b is attached to the end of the connecting shaft 17 on the pump case 1 side, a confirmation window 1 a is provided on a side surface of the pump case 1, and the pointer is formed along the confirmation window 1 a. Top and bottom of 17b Diaphragm pump, characterized in that a dial 1b to confirm.

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