JP6450298B2 - Reciprocating pump device - Google Patents

Description

  The present invention relates to a reciprocating pump device.

  Conventionally, as a reciprocating pump device, there is known a reciprocating pump device in which a crankshaft is rotatably held in a crankcase, and a reciprocating member reciprocates in a cylinder portion by the rotational motion of the crankshaft (see, for example, Patent Document 1) ). In such a reciprocating pump device, when the reciprocating member reciprocates, the working liquid flows into the pump chamber provided on the tip side in the cylinder portion, is pressurized, and is discharged to the outside.

JP 2007-278197 A

  In the reciprocating pump device as described above, generally, about half of the crankcase is filled with lubricating oil (oil). Lubricating oil in the crankcase flows while being stirred as the crankshaft rotates, and lubricates and cools sliding parts such as the crankshaft and connecting rod. Since this lubricating oil deteriorates with long-term use, it is necessary to replace it as necessary.

  As shown in FIGS. 7 (a) and 7 (b), in the conventional reciprocating pump device 110, in order to replace the lubricating oil in the crankcase 101, an oil inlet 102 and a discharge port 103 are provided in the crankcase 101. It has been. The oil supply port 102 is provided in the upper part of the crankcase 101, and the discharge port 103 is provided in the lower part of the crankcase 101. A plug member such as a plug 104 is attached to the discharge port 103. A cap 108 is attached to the oil supply port. When replacing the lubricating oil, the plug 104 is removed, the lubricating oil is discharged, the plug 104 is attached, and then the lubricating oil is injected from the oil inlet 102.

  In the conventional reciprocating pump device 110, a reinforcing rib 106 is provided in the vicinity of the plug 104. A female screw boss 107 is arranged at the position of the discharge port 103 so as to protrude toward the inner surface side of the crankcase 101. The plug 104 is inserted and screwed into the female screw boss 107, and the plug 104 is attached. The reinforcing ribs 106 are erected on both sides of the female screw boss 107. When the lubricating oil is discharged from the crankcase 101 with the pump set in the motor, the reinforcing ribs 106 are on both sides of the discharge port 103, so that the lubricating oil is difficult to come off. The crankcase 101 is manufactured by die-casting, and the crankcase 101 has a draft on the inner surface. Conventionally, the position of the plug 104 has been provided on the upstream side of the draft (the right side in FIG. 7B). Since the plug 104 is arranged at a position upstream of the draft, and the female screw boss 107 protrudes, it is difficult to completely remove the lubricating oil from the crankcase 101.

  An object of this invention is to provide the reciprocating pump apparatus which can shorten the time concerning discharge | emission of lubricating oil.

One aspect of the present invention is a reciprocating pump device in which lubricating oil (L) is injected into a substantially cylindrical crankcase (1). The crankcase (1) includes a substantially cylindrical peripheral wall (20), Provided in the upper part (20a) of the peripheral wall (20), the oil filler port (16) to which the first plug member (17) is attached, and provided in the bottom (20b) of the peripheral wall (20), the second plug member ( 19) is attached to the outlet (18), and the bottom (20b) of the peripheral wall (20) projects inwardly from the inner surface (20c) of the peripheral wall (20) and the crankcase (1) Ribs (51, 52) extending along the axial direction are provided, and other ribs other than the ribs (51, 52) are provided in the lower half region of the crankcase (1) filled with the lubricating oil (L). Is not provided .

  According to this reciprocating pump device, the bottom (20b) of the peripheral wall (20) of the crankcase (1) is provided with ribs (51, 52) protruding inward from the inner surface (20c) of the peripheral wall (20). It has been. The lubricating oil (L) flows along the ribs (51, 52) in the axial direction of the crankcase (1). Therefore, when discharging the lubricating oil (L), the lubricating oil (L) can smoothly flow down to the discharge port (18) without undulating the lubricating oil (L). As a result, the time required for discharging the lubricating oil (L) can be shortened.

  In some embodiments, the inner surface (20c) of the peripheral wall (20) has an axial gradient that is a draft at the time of molding, and the discharge port (18) is provided on the downstream side of the gradient. . In this case, according to the draft of the peripheral wall (20) of the crankcase (1), the lubricating oil (L) can smoothly flow down to the discharge port (18).

  In some embodiments, the bottom (20b) of the peripheral wall (20) is provided with guide grooves (61, 62) extending along the ribs (51, 52), and the guide grooves (61, 62) It has a slope down towards the outlet (18). In this case, the lubricating oil (L) can be discharged more promptly by the cooperation of the ribs (51, 52) and the guide grooves (61, 62) having a gradient descending toward the discharge port (18). .

  In some embodiments, the bottom (20b) of the peripheral wall (20) is provided with a female screw boss (58) to which the second plug member (19) is attached at the position of the discharge port (18). The female screw boss portion (58) is provided radially outward from the inner surface (20c) of the peripheral wall (20), and does not protrude from the inner surface (20c). In this case, after the lubricating oil (L) is discharged, the lubricating oil (L) remaining in the crankcase (1) can be reduced.

  According to some embodiments of the present invention, it is possible to reduce the time taken to discharge the lubricating oil (L).

It is a perspective view which shows the reciprocating pump apparatus which concerns on one Embodiment of this invention. It is a top view of the reciprocating pump apparatus of FIG. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. 2, and is sectional drawing which follows an axial direction. It is the perspective view which looked at the crankcase from the open end. It is a perspective view which expands and shows the peripheral part of the discharge port of FIG. (A) And (b) is sectional drawing of the conventional reciprocating pump apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the reciprocating pump device is a plunger pump device, which is a horizontal triple plunger pump device in which three rows of plungers are arranged in parallel in the horizontal direction.

  As shown in FIGS. 1 and 2, the plunger pump device 100 has an outer shape constituted by a crankcase (driving unit case) 1 and a manifold 2 connected to the crankcase 1.

  As shown in FIG. 3, a cylinder portion 4 in which a plunger sleeve 23 (described later) constituting the reciprocating member 3 reciprocates and a pump chamber 5 are formed at the distal end side of the cylinder portion 4 in the manifold 2. The The manifold 2 is also provided with a suction port 6 for introducing the working liquid into the pump chamber 5 and a discharge port 7 for discharging the working liquid compressed in the pump chamber 5. The suction port 6 and the discharge port 7 are connected to each other by a flow path 8. A suction valve 9 is provided on the suction port 6 side of the flow path 8, and a discharge valve 10 is provided on the discharge port 7 side of the flow path 8. It is done. A portion 11 of the flow path 8 between the suction valve 9 and the discharge valve 10 is connected to the pump chamber 5.

  The manifold 2 has a high-pressure seal 31 and a low-pressure seal 32 that are in fluid-tight sliding contact with the reciprocating member 3 (plunger sleeve 23) in order to prevent leakage of the working fluid in the pump chamber 5 to the crankcase 1 side. Arranged in this order from the pump chamber 5 side.

  As shown in FIGS. 3 and 4, the crankcase 1 is configured to be hollow, and in the crankcase 1, a crankshaft (drive shaft) 12, a connecting rod 14 rotatably connected to the crankshaft 12, and A piston pin 15 or the like that rotatably connects the plunger 13 and the connecting rod 14 is disposed. These constitute a drive unit 30 for driving the reciprocating member 3. The crankcase 1 in which the drive unit 30 is accommodated has a substantially cylindrical peripheral wall 20. The crankcase 1 has a substantially circular shape in which a cross-sectional shape orthogonal to the axis of the crankshaft 12 is formed with a predetermined thickness. For example, the peripheral wall 20 of the crankcase 1 may have an elliptical shape with the long axis positioned in the horizontal direction. The peripheral wall 20 of the crankcase 1 may have a perfect circle shape or other circular shape.

  The plunger 13 and the plunger sleeve 23 disposed on the pump chamber 5 side with respect to the plunger 13 are connected by a bolt 24 to constitute the reciprocating member 3. Inside the crankcase 1 to the manifold 2, a plunger 13 is disposed on the crankcase 1 side, and a plunger sleeve 23 is disposed in the cylinder portion 4 on the manifold 2 side. A rotating portion between the crankshaft 12 and the connecting rod 14, a rotating portion between the connecting rod 14 and the piston pin 15, and the like are sliding portions in the crankcase 1.

  Lubricating oil (oil) L is injected into the crankcase 1. The lubricating oil L is injected into the crankcase 1 around the center axis of the crankshaft 12, that is, about half of the crankcase 1. As a result, up to approximately the lower half of the drive unit 30 (a part of the drive unit 30) is immersed in the lubricating oil L.

  An oil seal 33 that is in fluid-tight sliding contact with the plunger 13 of the reciprocating member 3 is disposed on the manifold 2 side of the crankcase 1. The oil seal 33 prevents the lubricating oil L in the crankcase 1 from leaking.

  As shown in FIGS. 4 and 5, the crankcase 1 has a bottomed cylindrical shape in which one end in the axial direction is closed and the other end is opened. The crankcase 1 is, for example, a casting, and is manufactured by die casting or the like. The inner surface 20c of the circumferential wall 20 having a substantially cylindrical shape is expanded in diameter from the closed end 41 side toward the open end 42 side. Thereby, a draft angle is formed on the inner surface 20 c of the peripheral wall 20.

  A bearing 43 is disposed inside the closed end portion 41 side of the crankcase 1, and this bearing 43 supports one end of the crankshaft 12. A disc-shaped bearing case (closing member) 46 is fixed to the open end 42 of the crankcase 1 to close the open end 42. The bearing case 46 has a bearing 44 inside, and this bearing 44 supports the other end of the crankshaft 12. The other end of the crankshaft 12 protrudes through the bearing case 46, and a drive source such as a motor is connected to the protruding portion. The plunger pump device 100 is disposed so that the axis of the crankcase 1 is horizontal in a state where the plunger pump device 100 is set in a drive source such as a motor.

  In the bearing case 46, an oil seal 48 that is in fluid-tight sliding contact with the crankshaft 12 is disposed on the outer side of the bearing 44 in the axial direction. The oil seal 48 prevents the lubricating oil L in the crankcase 1 from leaking.

  As shown in FIGS. 3 and 4, an oil injection port 16 for injecting the lubricating oil L is provided in the upper portion 20 a of the peripheral wall 20. A cap cap (first plug member) 17 is attached to the oil filling port 16. More specifically, a thick female screw boss portion 56 is formed in the upper portion 20 a of the peripheral wall 20 at the position of the oil filling port 16. The cap-with-plug 17 is screwed into the female screw boss portion 56 and is detachably fixed. The cap-with-plug 17 closes the oil inlet 16 so as to keep the liquid tightness of the crankcase 1. The female screw boss portion 56 is provided radially outward from the inner surface 20c of the peripheral wall 20, and does not protrude from the inner surface 20c. In addition, although the upper part 20a of the surrounding wall 20 said here contains the top part (highest site | part) of the surrounding wall 20, it means the part except at least the lower part of the surrounding wall 20, and is not restricted to the top part of the surrounding wall 20. The upper part 20a of the peripheral wall 20 is a position higher than the liquid level of the lubricating oil L.

  A discharge port 18 for discharging the lubricating oil L is provided at the bottom 20b of the peripheral wall 20. A drain plug (second plug member) 19 is attached to the discharge port 18. More specifically, a thick female screw boss 58 is formed at the bottom 20 b of the peripheral wall 20 at the position of the discharge port 18. The drain plug 19 is screwed into the female screw boss portion 58 and is detachably fixed. The drain plug 19 closes the discharge port 18 so that the liquid tightness of the crankcase 1 is maintained. The female screw boss portion 58 is provided radially outward from the inner surface 20c of the peripheral wall 20, and does not protrude from the inner surface 20c.

  The oil filling port 16 and the discharge port 18 described above are provided closer to the open end 42 than the central portion in the axial direction of the crankcase 1. In other words, the oil supply port 16 and the discharge port 18 are provided on the downstream side of the draft of the inner surface 20c. By providing the discharge port 18 on the downstream side of the gradient, the lubricating oil L can be discharged more smoothly when the lubricating oil L is replaced. The oil filling port 16 and the female screw boss portion 56 and the discharge port 18 and the female screw boss portion 58 are provided, for example, at positions that are vertically symmetrical.

  The conventional female screw boss 107 shown in FIG. 7 is provided at a position protruding from the inner surface of the crankcase 101 (higher than the inner surface). Therefore, in order to facilitate demolding when the crankcase 101 is molded, the female screw boss 107 is provided on the upstream side of the draft (the right side in FIG. 7B). However, since the female screw boss portion 56 and the female screw boss portion 58 of the present embodiment have a structure that does not protrude from the inner surface 20c of the peripheral wall 20, the oil supply port 16 or the discharge port 18 is provided in the middle in the axial direction. However, there is no hindrance to mold removal (move of the mold in the axial direction) when the crankcase 1 is molded.

  Further, a first rib 51 and a second rib 52 projecting inward from the inner surface 20 c are provided on the bottom 20 b of the peripheral wall 20. The first rib 51 and the second rib 52 extend in parallel to the axial direction of the crankcase 1. The first rib 51 and the second rib 52 face inward and extend along a plane passing through the axis of the crankcase 1. In other words, the first rib 51 and the second rib 52 extend in a straight line on both sides of the discharge port 18 in the axial direction. The first rib 51 is provided between the discharge port 18 and the closed end portion 41. The second rib 52 is provided between the discharge port 18 and the open end portion 42.

  As described above, the first rib 51 and the second rib 52 are provided so as not to overlap the position of the discharge port 18. Each end of the first rib 51 and the second rib 52 is terminated so as to be flush with the circumferential surface of the discharge port 18 (see FIG. 6). That is, the first rib 51 and the second rib 52 are separated in the axial direction of the discharge port 18, and a ribless portion 55 having a width equal to the diameter of the discharge port 18 is provided between them. .

  The height of the 1st rib 51 and the 2nd rib 52 is made into the height which does not interfere with the drive part 30 (connecting rod 14). That is, a gap always exists between the first rib 51 and the second rib 52 and the drive unit 30. The first rib 51 and the second rib 52 have the same and constant thickness over the extending direction. Note that the thicknesses of the first rib 51 and the second rib 52 may be gradually increased from the closed end 41 toward the open end 42 in consideration of ease of demolding.

  As shown in FIGS. 4 and 5, a first guide groove 61 and a second guide groove 62 extending along the first rib 51 and the second rib 52 are provided on the bottom portion 20 b of the peripheral wall 20, respectively. The first guide groove 61 and the second guide groove 62 are provided in parallel on both sides (both sides) of the first rib 51 and the second rib 52, respectively. The first guide groove 61 and the second guide groove 62 extend to the discharge port 18 and communicate with the discharge port 18.

  Each of the first guide groove 61 and the second guide groove 62 has a gradient descending toward the discharge port 18. That is, the two first guide grooves 61 provided on both sides of the first rib 51 have a gradient that decreases from the closed end 41 side toward the open end 42 side. The two second guide grooves 62 provided on both sides of the second rib 52 have a slope that decreases from the open end 42 side toward the closed end 41 side. Thus, one first guide groove 61 has the same gradient as the draft of the peripheral wall 20, but the other second guide groove 62 has a gradient opposite to the draft of the peripheral wall 20. Therefore, the depth from the inner surface 20 c of the first guide groove 61 may be constant, or may gradually increase as it approaches the discharge port 18. The depth from the inner surface 20 c of the second guide groove 62 becomes deeper as it approaches the discharge port 18. Due to the first guide groove 61 and the second guide groove 62 having a gradient descending toward the discharge port 18, the lubricant oil L is smoothly and rapidly discharged when the lubricant oil L is replaced.

  A third rib 53 and a fourth rib 54 projecting inward from the inner surface 20 c are provided on the upper portion 20 a of the peripheral wall 20. The third rib 53 is provided vertically symmetrically with the first rib 51, and the fourth rib 54 is provided vertically symmetrical with the second rib 52. The 3rd rib 53 and the 4th rib 54 are provided so that it may not overlap with the position of the oil filler opening 16. The positional relationship between the third rib 53 and the fourth rib 54 and the oil filling port 16 is the same as the positional relationship between the first rib 51 and the second rib 52 and the discharge port 18 described above.

  The first rib 51 and the second rib 52 are disposed directly above the drive unit 30 including the crankshaft 12. As a result, when the plunger pump device 100 is driven, the lubricating oil L in the crankcase 1 is scraped up by the rotation of the crankshaft 12, and a part thereof reaches the upper portion of the peripheral wall 20 of the crankcase 1 by centrifugal force. Adhere. The lubricating oil L adhering to the upper part of the peripheral wall 20 falls down along the rib 21 and is returned to the sliding part side constituting the driving part 50. By returning the lubricating oil L to the rotating portion between the crankshaft 12 and the connecting rod 14, the sliding portion can be sufficiently lubricated and cooled, and as a result, the oil temperature can be lowered.

  As shown in FIG. 3, no ribs other than the first ribs 51 and the second ribs 52 are provided in the lower half region of the crankcase 1 where the lubricating oil L is filled. As described above, the plunger pump device 100 does not have ribs that obstruct oil drainage, and can smoothly drain oil.

  In the plunger pump device 100 described above, when the drive unit 30 is driven by a drive source such as a motor and the crankshaft 12 is rotationally driven, the reciprocating member 3 connected to the crankshaft 12 via the connecting rod 14 is reciprocated. The plunger sleeve 23 reciprocates in the cylinder part 4. Then, when the reciprocating member 3 moves toward the crankshaft 12 side, the pump chamber 5 is depressurized, the suction valve 9 and the discharge valve 10 of the manifold 2 are opened and closed, respectively, and the working liquid is supplied to the suction port 6, The air is sucked into the pump chamber 5 through the suction valve 9. On the other hand, when the reciprocating member 3 moves toward the side opposite to the crankshaft 12, the pump chamber 5 is pressurized, the suction valve 9 and the discharge valve 10 are closed and opened, respectively, and the working liquid in the pump chamber 5 is discharged. It is discharged to the discharge port 7 through the valve 10. In this way, the plunger pump device 100 performs a pumping action that sucks, pressurizes, and discharges the working liquid.

  On the other hand, when the lubricating oil L in the crankcase 1 is replaced with the plunger pump device 100 set in a drive source such as a motor, the plug-equipped cap 17 and the drain plug 19 are first removed, and the oil inlet 16 And the outlet 18 is opened. Thereby, the lubricating oil L is discharged. At this time, by having the above-described configuration, the lubricating oil L is discharged smoothly and quickly, and the time required for discharging the lubricating oil L is shortened. Further, the lubricating oil L can be removed, and the amount of the lubricating oil L remaining in the crankcase 1 is reduced.

  More specifically, the plunger pump device 100 is provided with the first rib 51 and the second rib 52 on the bottom 20b of the peripheral wall 20, and the axis of the crankcase 1 along the rib. Lubricating oil L flows in the direction. Therefore, when the lubricating oil L is discharged, the lubricating oil L can smoothly flow down to the discharge port 18 without undulation. As a result, the time taken to discharge the lubricating oil L can be shortened.

  Further, since the discharge port 18 is provided on the downstream side of the gradient, the lubricating oil L can smoothly flow down to the discharge port 18 in accordance with the draft of the peripheral wall 20 of the crankcase 1.

  Moreover, the 1st guide groove 61 and the 2nd guide groove 62 which have the gradient which goes down toward the discharge port 18 are provided (refer FIG. 6). The first guide groove 61 and the second guide groove 62 promote the flow of the lubricating oil L, and even when a small amount of the lubricating oil L remains in the crankcase 1, the small amount of the lubricating oil L is discharged to the outlet. 18 can be guided. By the cooperation of the first rib 51 and the second rib 52 and the first guide groove 61 and the second guide groove 62, the lubricating oil L can be discharged more quickly and reliably.

  In particular, since the second rib 52 and the second guide groove 62 are provided on the downstream side of the discharge port 18, the lubricating oil L existing most downstream also passes through the second guide groove 62 from the discharge port 18. Discharged.

  By the female screw boss portion 58 that does not protrude from the inner surface 20c, the lubricating oil L remaining in the crankcase after the lubricating oil L is discharged can be reduced.

  Furthermore, since the heat transfer area of the crankcase 1 is increased by the first rib 51 to the fourth rib 54, the heat dissipation efficiency of the crankcase 1 can be increased. As a result, the oil temperature can be further lowered.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. The 1st rib 51 and the 2nd rib 52 are not restricted to an above-described aspect. The first rib 51 and the second rib 52 are not limited to extending in parallel to the axial direction of the crankcase 1, and may extend in a direction that forms a predetermined angle with the axial direction of the crankcase 1. Either the first rib 51 or the second rib 52 may be omitted. The first rib 51 and the second rib 52 may be continuous and may cross the position of the discharge port 18.

  The first rib 51 and the second rib 52 are not limited to being integrally formed on the peripheral wall 20 by casting, and may be attached to the inner surface 20c of the peripheral wall 20 by welding or the like after the peripheral wall 20 is formed by casting. The crankcase is not limited to being manufactured by die casting.

  Both or any one of the first guide groove 61 and the second guide groove 62 may not reach the discharge port 18, and therefore may not communicate with the discharge port 18. Both or one of the first guide groove 61 and the second guide groove 62 may be omitted. The first guide groove 61 is not limited to a pair provided on both sides of the first rib 51, and may be one. The second guide groove 62 is not limited to a pair provided on both sides of the second guide groove 62, and may be one.

  In the above embodiment, the plunger pump device 100 is a multiple type, but it can also be applied to a single type (one plunger) plunger pump device. In the said embodiment, although application with respect to a plunger pump apparatus was described, this invention is applicable also to the piston pump apparatus etc. which contain a forced valve type, for example. The present invention can be applied to all reciprocating pumps in general.

  DESCRIPTION OF SYMBOLS 1 ... Crankcase, 16 ... Oil supply port, 17 ... Cap with plug (1st plug member), 18 ... Discharge port, 19 ... Drain plug (2nd plug member), 20 ... Perimeter wall, 20a ... Upper part, 20b ... Bottom part, 20c ... inner surface, 51 ... first rib, 52 ... second rib, 58 ... female screw boss, 61 ... first guide groove, 62 ... second guide groove, 100 ... plunger pump device (reciprocating pump device), L …Lubricant.

Claims (4)

In a reciprocating pump device in which lubricating oil (L) is injected into a substantially cylindrical crankcase (1),
The crankcase (1)
A substantially cylindrical peripheral wall (20);
An oil inlet (16) provided on the upper part (20a) of the peripheral wall (20) to which the first plug member (17) is attached;
An outlet (18) provided at the bottom (20b) of the peripheral wall (20) to which the second plug member (19) is attached;
Ribs (51, 52) projecting inward from the inner surface (20c) of the peripheral wall (20) and extending along the axial direction of the crankcase (1) are formed on the bottom (20b) of the peripheral wall (20). Provided ,
The reciprocating pump device according to claim 1, wherein no ribs other than the ribs (51, 52) are provided in a lower half region of the crankcase (1) filled with the lubricating oil (L) . The inner surface (20c) of the peripheral wall (20) has a gradient in the axial direction, which is a draft at the time of molding,
The reciprocating pump device according to claim 1, wherein the discharge port (18) is provided on the downstream side of the gradient. Guide grooves (61, 62) extending along the ribs (51, 52) are provided in the bottom (20b) of the peripheral wall (20),
The reciprocating pump device according to claim 1 or 2, characterized in that the guide groove (61, 62) has a gradient descending toward the discharge port (18). A female screw boss (58) to which the second plug member (19) is attached is provided at the bottom (20b) of the peripheral wall (20) at the position of the discharge port (18).
4. The female screw boss (58) is provided radially outward from the inner surface (20c) of the peripheral wall (20), and does not protrude from the inner surface (20c). The reciprocating pump device according to any one of the above.

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