JP4364142B2 - Reciprocating pump - Google Patents

Description

  The present invention relates to a reciprocating pump such as a plunger pump or a piston pump.

  Conventionally, in this type of reciprocating pump, a piston rod (reciprocating member) is inserted into a crankcase containing oil via an oil seal, and a plunger (reciprocating member) integrally connected to the piston rod. ) Extends through the seal packing to the pump portion that performs the pumping action. A single swing washer is attached to the outer periphery of the piston rod at a position between the oil seal and the seal packing (see, for example, Patent Documents 1 and 2). This swing washer leaks from the crankcase through the oil seal, leaks from the pump rod through the oil transferred through the piston rod, or from the pump through the seal packing, and deposits and drops the liquid transferred through the plunger. Is.

Japanese Utility Model Publication 4-33966 JP 2004-162646 A

  However, in such a conventional reciprocating pump, if the reciprocating pump is used over a long period of time and the sealing performance of the oil seal or seal packing is deteriorated, as described above, one swing washer is provided on the piston rod. However, the oil leaked from the crankcase jumps over the swing washer and travels through the plunger from the piston rod and enters the pump unit. There is a risk of getting into the crankcase.

  On the other hand, if the distance between the oil seal and the seal packing is increased or the outer diameter of the swing washer is increased in order to increase the effect of preventing the intrusion of such oil or liquid, the entire reciprocating pump will be enlarged. There is a problem.

  The present invention has been made in view of the above circumstances, and prevents oil in the crankcase from entering the pump chamber and prevents liquid in the pump chamber from entering the crankcase. It is an object of the present invention to provide a reciprocating pump that can be made compact.

In order to achieve the above object, the reciprocating pump according to claim 1, wherein the reciprocating member (2, 9, 32, 41) is provided with a first seal member (1, 31) on the crankcase (1, 31) containing oil. 3, 33) and is connected to a drive unit that reciprocates the reciprocating members (2, 9, 32, 41), and is connected to a pump unit that performs a pumping action for sucking and discharging liquid. The first seal member (3, 33) and the second seal member extend on the outer periphery of the reciprocating member (2, 9, 32, 41). (11, 42) are provided with a plurality of swing washers (14, 16, 51, 53) spaced apart from each other, and the outer diameter of each of these swing washers (14, 16, 51, 53). (C, D, C1, D1) are the reciprocating members (14, 16 Outside diameter (E of 51 and 53), F, E1, F1) than the magnitude rot, the shake-off between washers (14,16,51,53) is that the color (15,52) are provided Features.

In the first aspect of the invention, since the plurality of swing washers are provided at intervals on the outer periphery of the reciprocating member between the first seal member and the second seal member, The oil or liquid leaking from the crankcase through the first seal member or the second seal member travels along the reciprocating member, is dammed and attached to the first swing washer, and most of it falls. Part of the oil or liquid adhering to the first swinging washer flies due to the reciprocating inertia of the reciprocating member, and the second (next) swinging washer and the second swinging washer and one Although it adheres to the eye swing washer, the amount of adhesion decreases, so that almost no oil or liquid jumps over the second shake washer. Therefore, the oil in the crankcase can be prevented from entering the pump part through the reciprocating member, and the liquid in the pump part can be prevented from entering the crankcase through the reciprocating member. Can do. Further, since the movement of the oil and liquid transmitted through the reciprocating member of the oil and liquid can be prevented by the swinging washer as described above, the distance between the first sealing member and the second sealing member can be increased, or the swinging washer can be increased. Since it is not necessary to increase the outer diameter, the entire reciprocating pump can be made compact.
Here, as the swinging washer, for example, a perforated dish or a perforated disk can be used.

In addition , since the collar is interposed between the swing washers, it is easy to assemble the spacing between the swing washers with high accuracy.

The reciprocating pump according to claim 2 is the invention according to claim 1 , wherein the outer diameter (G, G1) of the collar (15, 52) is equal to the reciprocating member ((2, 9, 32, 41). Smaller than the outer diameter (C, D, C1, D1).

In the second aspect of the invention, the outer diameter difference between the collar and the swing washer is larger than the outer diameter difference between the reciprocating member and the swing washer, so that the oil or liquid on the collar jumps over the swing washer. Is no longer easy. As a result, the oil in the crankcase is prevented from entering the pump chamber through the reciprocating member, and the effect of preventing the liquid in the pump chamber from entering the crankcase through the reciprocating member is remarkable. It will be something.

  According to the reciprocating pump of the present invention, the oil in the crankcase can be prevented from entering the pump portion through the reciprocating member, and the liquid in the pump portion can be prevented from entering the crankcase through the reciprocating member. Intrusion can be prevented. Moreover, the whole reciprocating pump can be made compact.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a main part of the plunger pump according to the first embodiment of the present invention.
This plunger pump (reciprocating pump) includes a crankcase 1, and oil (lubricating oil) is accommodated in the crankcase 1. A piston rod 2 is inserted into the crankcase 1 via an oil seal (first seal member) 3 so as to be reciprocally movable. The rear end portion of the piston rod 2 is connected to a drive unit (not shown) in the crankcase 1 and is reciprocated by the drive unit. In addition, a manifold 4 is connected to the front side of the crankcase 1 via a tubular joint fitting 5, and the manifold 4 is fastened and fixed to the crankcase 1 with bolts 6. In the manifold 4, a pump chamber 7 into which liquids such as water and agricultural chemicals are taken in and out is formed. In the pump chamber 7, a pipe-like plunger 9 fixed to the distal end portion of the piston rod 2 by a bolt 8 extends. The plunger (reciprocating member) 9 is supported by the joint fitting 5 via a seal packing (second seal member) 11 and supported by the manifold 4 via a seal packing 12.

  A small-diameter portion 2a is formed at the tip of the piston rod 2, and a perforated dish-shaped first swing washer 14, a collar 15 and a perforated-plate-shaped second swing-off are formed outside the small-diameter portion 2a. A washer 16 is fitted in this order from the rear end side, and these first swing washer 14, collar 15 and second swing washer 16 are formed by the plunger 9 being fastened to the piston rod 2 with bolts 10. The plunger 9 is sandwiched between the rear end of the plunger 9 and the stepped portion 2b of the piston rod 2. The first swing washer 14, the collar 15, and the second swing washer 16 are located in a substantially cylindrical seal presser 17 that is interposed between the oil seal 3 and the seal packing 11. The outer diameters C and D of the first swing washer 14 and the second swing washer 16 are both larger than the outer diameter E of the piston rod 2 and larger than the outer diameter F of the plunger 9. The outer diameter G of the collar 15 is smaller than the outer diameter E of the piston rod 2 and smaller than the outer diameter F of the plunger 9.

  In the manifold 4, a water suction port 21 and a discharge port 22 are formed in communication with the pump chamber 7. Further, a suction valve assembly 23 is provided between the water suction port 21 and the pump chamber 7, and this suction valve assembly 23 is a check that allows only the flow from the water suction port 21 to the pump chamber 7. Acts as a valve. On the other hand, a discharge valve assembly 24 is provided between the discharge port 22 and the pump chamber 7, and the discharge valve assembly 24 allows only a flow from the pump chamber 7 to the discharge port 22. Function as. Part of the liquid sucked from the water suction port 21 is supplied to the space between the seal packing 11 and the seal packing 12 via the communication passage 25 communicating with the water suction port 21. Thus, the seal packing 11 and the seal packing 12 are lubricated by the liquid. The front side (manifold 4 side) from the seal packing 11 is a pump unit that performs a pumping action for sucking and discharging liquid.

Next, the operation of this plunger pump will be described.
When the piston rod 2 is reciprocated (advanced / retreated) by the drive unit, the plunger 9 moves back and forth in the pump chamber 7, whereby the liquid moves from the water suction port 21 to the discharge port 22 through the pump chamber 7, Functions as a pump.

That is, when the piston rod 2 moves backward (moves to the opposite side of the manifold 9), the plunger 9 moves backward in the pump chamber 7, and thereby the pressure in the pump chamber 11 becomes negative. Then, the liquid flows from the water inlet 21 into the pump chamber 7 through the suction valve assembly 23.
On the other hand, when the piston rod 2 moves forward (moves toward the manifold 9), the plunger 9 moves forward in the pump chamber 7, whereby the liquid in the pump chamber 7 is pushed out of the pump chamber 7 and discharged through the discharge valve assembly 24. It is discharged from the outlet 22.

  In such a plunger pump, when the oil in the crankcase 1 leaks through the oil seal 3, the leaked oil travels through the piston rod 2 and is dammed and attached to the first swinging washer 14. The part falls here. Part of the oil adhering to the first swinging washer 14 flies due to the inertia of the reciprocating motion of the piston rod 2, and the second swinging washer 16 or between the second swinging washer 16 and the first swinging washer 14. However, since the amount of adhesion decreases, almost no oil jumps over the second swing washer 16. Therefore, the oil in the crankcase 1 can be prevented from entering the pump portion through the piston rod 2 and the plunger 9.

  On the other hand, when the liquid in the pump section leaks through the oil seal 11, the leaked liquid is transferred to the plunger 9 and is dammed and attached to the second swing washer 16, and most of it falls here. A part of the liquid adhering to the second swinging washer 16 flies by the inertia of the reciprocating motion of the plunger 9, and the first swinging washer 14 or between the first swinging washer 14 and the second swinging washer 16. Although it adheres to the intervening collar 15, the amount of adhesion decreases, so that almost no liquid jumps over the first swing washer 14. Therefore, it is possible to prevent the liquid in the pump part from entering the crankcase 1 through the plunger 9 and the piston rod 2.

  Moreover, the outer diameter difference (CG, DG) between the collar 15 and the swing washer 14, 16 is different from the outer diameter difference (CE, DE) between the piston rod 2 and the swing washer 14, 16 or Since it is larger than the outer diameter difference (C−F, D−F) between the plunger 9 and the swing washers 14 and 16, it is not easy for oil or liquid on the collar 15 to jump over the swing washers 14 and 16. Therefore, the effect of preventing oil and liquid from moving along the piston rod 2 and the plunger 9 becomes more remarkable.

In this way, in this plunger pump, the two swing washers 14 and 16 and the collar 15 can effectively prevent oil and liquid from moving along the piston rod 2 and the plunger 9. Therefore, it is not necessary to increase the distance between the oil seal 3 and the seal packing 11 or increase the outer diameter of the swing washer, so that the entire plunger pump can be made compact.
In addition, since the collar 15 is interposed between the swing washers 14 and 16, the interval between the swing washers 14 and 16 can be easily assembled with high accuracy.

FIG. 2 is a longitudinal sectional view showing a main part of a uniflow-type piston pump according to the second embodiment of the present invention.
This piston pump (reciprocating pump) has a crankcase 31, and oil (lubricating oil) is accommodated in the crankcase 31. A piston rod (reciprocating member) 32 is inserted into the crankcase 31 via an oil seal 33 (first seal member) so as to be reciprocally movable. The rear end portion of the piston rod 32 is connected to a drive portion (not shown) in the crankcase 31 and is reciprocated by the drive portion. Further, a cylinder base metal 34 is connected to the front side of the crankcase 31, and a water inlet 35 is formed in the cylinder base metal 34.

  A rear end portion of the cylinder 37 is fitted in a liquid-tight manner on the front side of the cylinder base metal 34, and a pump chamber 38 is formed in the cylinder 37 so as to communicate with the water inlet 35. Liquid such as water and agricultural chemicals is taken in and out of the pump chamber 38. Further, the tip of the piston rod 32 extends into the pump chamber 38. A sleeve (reciprocating member) 41 is liquid-tightly fitted to the outside of the small-diameter portion 32 a of the piston rod 32, and the portion of the sleeve 41 is supported by the cylinder base metal 34 via the seal packing 42. Yes. Between the seal packing (second seal member) 42 and the oil seal 33, a substantially cylindrical seal presser 44 is interposed, and a felt packing 45 is disposed in the seal presser 44, and this felt packing. 45 is inserted outside the sleeve 41. The upper end portion of the felt packing 41 faces the oil filling port 31 a of the crankcase 31, and the lower end portion thereof is inserted into an oil pan 46 attached to the crankcase 31.

  On the outside of the rear end portion of the small-diameter portion 32a of the piston rod 32, a perforated dish-shaped first swing washer 51, a collar 52 and a perforated dish-shaped second swing washer 53 are fitted in this order from the rear end side. The first swing washer 51, the collar 52, and the second swing washer 53 are sandwiched between the step portion 32b of the piston rod 32 and the sleeve 41. The first swing washer 51, the collar 52, and the second swing washer 53 are located on a seal presser 44 that is interposed between the oil seal 33 and the seal packing 42. The outer diameters C1 and D1 of the first swing washer 51 and the second swing washer 53 are both larger than the outer diameter E1 of the piston rod 32 and larger than the outer diameter F1 of the sleeve 41. The outer diameter G1 of the collar 52 is smaller than the outer diameter E1 of the piston rod 2 and smaller than the outer diameter F1 of the sleeve 41.

  In addition, a valve seat 61, a collar 62, and a stopper 63 are incorporated in that order on the front side of the sleeve 41 at the tip of the piston rod 32. Then, the first swinging washer 51, the collar 52, the second swinging washer 53, the sleeve 41, the valve seat 61, the collar 62, and the stopper 63 are fitted to the outside of the small diameter portion 32a of the piston rod 32 from the rear side. When the nut 65 is tightened to the tip end portion of the piston rod 32, these members are sandwiched between the stepped portion 32 b of the piston rod 32 and the nut 65. An annular valve body 66 is loosely fitted on the outside of the collar 62 between the valve seat 61 and the stopper 63, and a gap 67 is formed between the valve body 66 and the collar 62. ing. A piston packing 68 is mounted on the outer periphery of the valve body 66, and the piston packing 68 slides on the inner peripheral surface of the cylinder 37. The valve body 67 is set to a length shorter than the distance between the valve seat 24 and the stopper 26, and when the valve body 67 contacts the stopper 63, the valve body 67 is interposed between the valve body 67 and the valve seat 61. A gap 69 is formed. A hole 63 a is formed in the stopper 63, and the hole 63 a communicates with a gap 67 between the valve body 66 and the collar 62 when the valve body 67 contacts the stopper 63.

  A cylinder tip 71 is fluid-tightly fitted to the tip of the cylinder 37, and a discharge port 72 is formed in the cylinder tip 71 in communication with the pump chamber 38. Further, a discharge valve assembly 73 is provided between the cylinder 37 and the cylinder tip 71, and this discharge valve assembly 73 is a check that allows only the flow from the pump chamber 38 to the discharge port 72. Acts as a valve. The front side (cylinder tip fitting 71 side) from the seal packing 42 is a pump unit that performs a pumping action for sucking and discharging liquid.

Next, the operation of this piston pump will be described.
When the piston rod 32 is reciprocated (advanced / retreated) by the drive unit, the tip of the piston rod 32 moves back and forth in the pump chamber 38, whereby liquid is discharged from the water intake port 35 through the pump chamber 38 to the discharge port 72. And move as a pump.

That is, when the piston rod 32 moves backward (moves toward the cylinder base bracket 34), the tip of the piston rod 32 moves backward in the pump chamber 38, and as a result, the valve body 67 as shown in FIG. The body 67 comes into contact with the stopper 63 and the valve body 67 is separated from the valve seat 61. Then, the liquid sucked from the suction port 35 sequentially passes through the gap 69 between the valve body 67 and the valve seat 61, and between the valve body 66 and the collar 62 through the gap 67 and the hole 63 a of the stopper 63. It flows into the pump chamber 38.
On the other hand, when the piston rod 32 moves forward (moves toward the cylinder tip fitting 71), the tip of the piston rod 32 moves forward in the pump chamber 38, thereby causing the valve body 67 on the lower side of FIG. The valve body 67 contacts the valve seat 61. Then, the liquid in the pump chamber 38 is pushed out of the pump chamber 38 by the valve body 67 and the valve seat 61, and is discharged from the discharge port 72 through the discharge valve assembly 73.

  In such a piston pump, when the oil in the crankcase 31 leaks through the oil seal 33, the leaked oil is transferred to the piston rod 32 and stuck to the first swinging washer 51 and attached. The part falls here. Part of the oil adhering to the first swinging washer 51 flies due to the inertia of the reciprocating motion of the piston rod 32, and the second swinging washer 53 or between the second swinging washer 53 and the first swinging washer 51. However, since the amount of adhesion decreases, almost no oil jumps over the second swing washer 53. Therefore, the oil in the crankcase 31 can be prevented from entering the pump portion through the piston rod 32 and the sleeve 41.

  On the other hand, when the liquid in the pump part leaks through the oil seal 42, the leaked liquid travels through the sleeve 41 provided outside the piston rod 32 and is dammed and attached to the second swing washer 53. It falls here. A part of the liquid adhering to the second swinging washer 53 flies by the inertia of the reciprocating motion of the piston rod 32, and the first swinging washer 51 or between the first swinging washer 51 and the second swinging washer 53. However, since the amount of adhesion decreases, almost no liquid jumps over the first swing washer 51. Therefore, it is possible to prevent the liquid in the pump unit from entering the crankcase 31 through the sleeve 41 and the piston rod 32.

  Moreover, the outer diameter difference (C1-G1, D1-G1) between the collar 52 and the swing washer 51, 53 is the outer diameter difference (C1-E1, D1-E1) between the piston rod 32 and the swing washer 51, 53 or Since it is larger than the outer diameter difference (C1-F1, D-F1) between the sleeve 41 and the swing washer 51, 53, it is not easy for oil or liquid on the collar 52 to jump over the swing washer 51, 53. Therefore, the effect of preventing oil and liquid from moving along the piston rod 32 and the sleeve 41 becomes more remarkable.

In this way, in this piston pump, the two swing washers 51, 53 and the collar 52 can effectively prevent oil and liquid from moving along the piston rod 32 and the sleeve 41. Therefore, since it is not necessary to increase the distance between the oil seal 32 and the seal packing 42 or increase the outer diameter of the swing washer, the entire piston pump can be made compact.
In addition, since the collar 15 is interposed between the swing washers 14 and 16, the interval between the swing washers 14 and 16 can be easily assembled with high accuracy.

  In each of the above-described embodiments, the perforated dish-shaped swing-off washer 14, 16, 51, 53 is used, but instead of this, a perforated disk-shaped swing-off washer may be used.

  In each of the above-described embodiments, the case where two swing washers 14, 16 (51, 53) are used has been described, but three or more swing washers may be used. The greater the number of swing washers, the greater the effect of preventing the ingress of oil or liquid.

It is a longitudinal cross-sectional view which shows the principal part of the plunger pump which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the principal part of the uniflow type piston pump which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

1, 31 Crankcase 2, 32 Piston rod (reciprocating member)
3, 33 Oil seal (first seal member)
9 Plunger (reciprocating member)
14, 51 First swing washer (swing washer)
15, 52 Color 16, 53 Second swing washer (swing washer)
11, 42 Seal packing (second seal member)
41 Sleeve (reciprocating member)
C, C1 outer diameter of first swing washer (outer diameter of swing washer)
D, D1 Outer diameter of second swing washer (outer diameter of swing washer)
E, E1 Piston rod outer diameter (outer diameter of reciprocating member)
F Outer diameter of plunger (outer diameter of reciprocating member)
F1 outer diameter of sleeve (outer diameter of reciprocating member)
G, G1 color outer diameter

Claims (2)

A reciprocating member (2, 9, 32, 41) is inserted through a first seal member (3, 33) into a crankcase (1, 31) that contains oil, and the reciprocating member (2, 9). , 32, 41) is connected to a drive unit that reciprocates, and extends through a second seal member (11, 42) to a pump unit that performs a pumping action for sucking and discharging liquid, and this reciprocating member The outer periphery of (2, 9, 32, 41) has a plurality of swing washers (14, 14) between the first seal member (3, 33) and the second seal member (11, 42). 16, 51, 53) are spaced from each other, and the outer diameter (C, D, C1, D1) of each of these swing washers (14, 16, 51, 53) is the reciprocating member (14, outside diameter (E of 16,51,53), F, E1, F1 ) from the magnitude rot Wherein the shake-off washer (14,16,51,53) between the reciprocating pump, characterized in that the collar (15,52) is provided. The outer diameter (G, G1) of the collar (15, 52) is smaller than the outer diameter (C, D, C1, D1) of the reciprocating member ((2, 9, 32, 41)). The reciprocating pump according to claim 1 .

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