JP5993345B2 - Reciprocating pump - Google Patents

Description

  The present invention relates to a reciprocating pump.

  Conventionally, a reciprocating pump that pumps liquid is known (see, for example, Patent Document 1). In the reciprocating pump of Patent Document 1, the rotational movement of the crankshaft is converted into a linear reciprocating movement by a connecting rod, and a reciprocating member attached to the leading end of the connecting rod is reciprocated in the cylinder, thereby The working fluid (liquid) is sucked into the formed pump chamber, and the working fluid is pressurized and fed.

JP 2011-17376 A

  In the reciprocating pump as described above, a cylindrical resin bearing may be disposed between the crankshaft and the connecting rod. In such a case, the crankshaft, the bearing and the connecting rod are assembled as follows, for example. The cylindrical bearing is divided into two parts each having a semicircular cross section when viewed in the axial direction. First, these divided bodies are brought into contact with the outer peripheral surface of the crankshaft. Subsequently, each attachment portion to the crankshaft having a semicircular cross section of the connecting rod divided in two in the axial direction view is attached to the outer peripheral surface of the bearing in contact with the crankshaft. At this time, it is necessary to attach each mounting portion of the connecting rod divided into two while holding down each portion of the bearing so that the two divided bearings are not detached from each other, and assembly is difficult.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a reciprocating pump that can improve assemblability.

The reciprocating pump (100) of the present invention comprises a crankshaft (6), a connecting rod (7) attached to the crankshaft (6), and a reciprocating member (1) attached to the connecting rod (7). The reciprocating pump (100) includes a cylindrical resin bearing (10) disposed between the crankshaft (6) and the connecting rod (7). The bearing (10) is viewed in the axial direction. 2 and divided into two or more divided bodies, and these divided bodies have a large divided body (10a) having a central angle larger than 180 °, and the large divided body (10a) has a crankshaft (6). Is disposed so as to cover a portion (S1) on the reciprocating member (1) side.

  In the reciprocating pump (100) of the present invention, the bearing (10) disposed between the crankshaft (6) and the connecting rod (7) is divided into two or more divided bodies. Since the central angle of the large divided body (10a) is larger than 180 °, when the crankshaft (6), the bearing (10) and the connecting rod (7) are assembled, the large divided body (10a) is cranked. It can be extrapolated so as not to deviate from the axis (6). Therefore, the connecting rod (7) can be attached without pressing the bearing (10). Moreover, since the bearing (10) is made of resin, it has elasticity. Accordingly, the large divided body (10a) can be extrapolated to the crankshaft (6) by easily widening the opening when viewed in the axial direction. Therefore, in the reciprocating pump (100) of the present invention, the assemblability can be improved.

Also, large divided body (10a), of the outer peripheral surface of the crank shaft (6), because have been arranged so as to cover the reciprocating member (1) of the portion (S1), divided parts of the bearing (10) (D1, D2) will be located in the part (S2) on the opposite side to the reciprocating member (1) side in the outer peripheral surface of a crankshaft (6). In the bearing (10), when pressurizing the working fluid, a large load acts on the portion (S1) on the reciprocating member (1) side. At this time, since the divided portions (D1, D2) of the bearing (10) are located on the portion (S2) on the opposite side (that is, on the side where the load is small) from the reciprocating member (1) side, the bearing (10) It can suppress that a big load acts on these division | segmentation location (D1, D2). Therefore, durability can be improved.

  One of the connecting rod (7) and the bearing (10) includes a protruding portion (10c) protruding in the radial direction, and the other of the connecting rod (7) or the bearing (10) is related to the protruding portion (10c). The recessed part (73) to match may be included. In this case, since the positioning of the connecting rod (7) and the bearing (10) can be easily performed, the assemblability can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the reciprocating pump (100) which can improve assembly property.

It is sectional drawing of the reciprocating pump which concerns on embodiment. It is the II-II arrow line view in FIG. FIG. 2 is an exploded side view of a crankshaft, a bearing, and a connecting rod in FIG. 1. FIG. 4 is a perspective view of a large divided body in FIG. 3.

  Hereinafter, a reciprocating pump according to an embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a reciprocating pump according to an embodiment, and FIG. 2 is a view taken in the direction of arrows II-II in FIG.

  As shown in FIGS. 1 and 2, the reciprocating pump 100 according to the present embodiment is configured such that the reciprocating member 1 reciprocates within the cylinder portion 2 (reciprocating left and right in the drawing), thereby reciprocating the reciprocating member 1. A pumping action is performed in which the working fluid (liquid) is sucked into the pump chamber 3 formed on the front side (left side in the drawing) in the direction, and the working fluid is pressurized and pumped. The reciprocating pump 100 is configured by connecting the crankcase 4 and the manifold 5 to each other. Here, the reciprocating pump 100 is a triple pump in which three sets each having a reciprocating member 1 and a cylinder portion 2 performing a pumping action are arranged in parallel (see FIG. 2).

  The reciprocating member 1 has a cylindrical plunger 1a disposed on the front side, and a cylindrical piston element 1b bolted to the rear end of the plunger 1a. The plunger 1a and the piston element 1b Reciprocate together.

  The front plunger 1 a is disposed in a cylinder member 16 mounted in the manifold 5 and reciprocates inside the cylinder member 16 (cylinder hole). The inside of the cylinder member 16 constitutes the cylinder part 2 in which the plunger 1 a reciprocates, and the pump chamber 3 is formed in the front part of the cylinder member 16. The piston element 1b on the rear side of the reciprocating member 1 is connected to the drive unit M via a piston pin 8 (details will be described later). The rear piston element 1b is configured to have a larger diameter than the front plunger 1a, and a concave portion 1c recessed toward the front side is formed in the rear part.

  The crankcase 4 is configured to be hollow, and a drive unit M that reciprocates the reciprocating member 1 is accommodated in the hollow portion. This hollow portion is a flow path R through which the working fluid flows, and accommodates the working fluid. Thus, the reciprocating pump 100 is configured such that the drive unit M is immersed in the working fluid in the flow path R, and the drive unit M bathes in the working fluid. An opening 41 is formed in the rear end surface of the crankcase 4, and the opening 41 is closed by a lid 42 that is bolted.

  The working fluid is a liquid that flows into the pump chamber 3 and is used for pumping in the pump chamber 3. Various liquids can be used as the working fluid, and here, fresh water is used. The drive part M bathed in such a working fluid has a crankshaft 6, a connecting rod 7, a piston pin 8, bearings 9, 10, 11 and the like.

  The crankshaft 6 is disposed so as to extend in a direction perpendicular to the reciprocating direction of the reciprocating member 1 (perpendicular direction in FIG. 1, up and down direction in FIG. 2). As shown in FIG. 2, both end sides of the crankshaft 6 are supported by bearing cases 13 and 14 that are bolted to the crankcase 4, respectively, and project outside through the bearing cases 13 and 14. Yes.

  Cylindrical bearings 9 are respectively disposed between the crankshaft 6 and the bearing cases 13 and 14, and the crankshaft 6 is rotatably supported by the bearings 9. As a material for forming the bearing 9 and the bearings 10 and 11 described later, various resins can be used. Here, a PEEK (polyether ether ketone) resin which is a high-strength water-resistant resin is used. Mechanical seals 15 are disposed between the crankshaft 6 and the bearing cases 13 and 14 and at both portions outside the bearings 9 and 9 in the axial direction of the crankshaft 6.

  The connecting rod 7 is provided corresponding to each reciprocating member 1. As shown in FIGS. 1 and 2, in the connecting rod 7, the rear-side (crankshaft 6 side) large-diameter portion 7 a is rotatably connected to the crankshaft 6 through a cylindrical bearing 10. (Details will be described later). The large diameter portion 7a is divided into two when viewed in the axial direction, and includes a substantially semicircular main body portion 71 and a cap portion 72 each having a central angle of 180 °. The main body portion 71 and the cap portion 72 are fastened by bolts B and B. In the connecting rod 7, the small diameter portion 7 b on the front side (reciprocating member 1 side) is rotatably connected to the piston pin 8 through a cylindrical bearing 11. The main body portion 71 and the small diameter portion 7b of the large diameter portion 7a are connected by a rod-shaped rod portion 7c.

  Inside the crankcase 4, a protruding portion 4 a that protrudes toward the rear side so as to approach the crankshaft 6 is provided at the front portion. A cylindrical guide member 12 is housed and fixed inside the protruding portion 4a. The guide member 12 is formed of, for example, the same resin as the bearings 9 to 11, and the piston element 1b of the reciprocating member 1 is inserted into the cylindrical hole to guide the reciprocating movement of the piston element 1b. A small-diameter portion 7b on the front side of the connecting rod 7 enters the recess 1c of the piston base 1b located in the guide member 12, and both ends of the piston pin 8 are fixed to the piston base 1b in a press-fit state.

  In the crankcase 4, a cylindrical seal case 17 is disposed in front of the guide member 12 so as to contact the guide member 12. In the middle of the seal case 17 in the axial direction, an annular flange 17a protruding inward is provided, and the plunger 1a of the reciprocating member 1 is inserted inside the flange 17a. A cylindrical high-pressure seal 18 is disposed inside the seal case 17 and on the front side of the flange portion 17a. The inner surface of the cylinder member 16 including the high-pressure seal 18 is the cylinder portion 2.

  The guide member 12, the seal case 17, the high-pressure seal 18, and the cylinder member 16 are sandwiched between the crankcase 4 and the manifold 5 by attaching the manifold 5 to the crankcase 4 with, for example, bolts. It is fixed.

  As shown in FIG. 1, the upper part of the crankcase 4 bulges above the manifold 5 (upward in FIG. 1), and the end face of the bulging part on the front side (manifold 5 side) has a crankcase 4. A water intake port 19 that communicates with the inner flow path R and allows the working fluid to flow into the flow path R is opened. In addition, at the end face of the crankcase 4 on the manifold 5 side and below each seal case 17, the working fluid is communicated with the flow path R in the crankcase 4 from the flow path R to the manifold 5 side. An outflow port 20 for allowing the liquid to flow out is opened.

  An inlet 21 that communicates with the outlet 20 of the crankcase 4 is opened in the manifold 5. Between the inflow port 21 and the pump chamber 3, a water absorption side channel R <b> 1 through which the working fluid from the channel R in the crankcase 4 flows is formed. The water absorption side flow path R1 is provided with a water absorption valve 22 for opening and closing the water absorption side flow path R1.

  The manifold 5 is provided with a discharge port 23 for discharging the working fluid from the pump chamber 3 to the outside, and a discharge valve 24 is formed at the tip of each pump chamber 3 so as to constitute the pump chamber 3. Is provided. Each discharge valve 24 opens and closes each pump chamber 3, and a discharge-side flow path R <b> 2 through which the working fluid from the pump chamber 3 flows is formed between the discharge side of each discharge valve 24 and the discharge port 23. Has been.

  Next, the bearing 10 disposed between the crankshaft 6 and the connecting rod 7 will be described in detail. 3 is an exploded side view of the crankshaft, bearing, and connecting rod in FIG. 1, and FIG. 4 is a perspective view of the large divided body in FIG. In FIG. 3, the bearings 10 and 11 are hatched for easy viewing.

  As shown in FIG. 3, the cylindrical bearing 10 is divided into two or more (here, two) divided bodies when viewed in the axial direction, and includes a large divided body 10 a and a small divided body 10 b. And have. The central angle α of the large divided body 10a is larger than 180 °. The central angle β of the small divided body 10b is smaller than 180 °.

  The large divided body 10a is arranged so as to cover the reciprocating member 1 side (front side) portion (semicircle portion covered by the main body 71) S1 of the outer peripheral surface of the crankshaft 6. Thereby, the division | segmentation location D1, D2 of the bearing 10 is in the part (semicircle part covered with the cap part 72) S2 on the outer peripheral surface of the crankshaft 6 on the opposite side (rear side) with respect to the reciprocating member 1 side. positioned. Specifically, the large divided body 10a is arranged line-symmetrically with the axis of the rod portion 7c as the axis of symmetry, and in the large-diameter portion 7a that is the attachment portion of the connecting rod 7 to the crankshaft 6, the rod portion 7c is The inner peripheral surface of the connected main body 71 is covered. The small divided body 10b is arranged so as to cover a portion S2 on the opposite side of the outer peripheral surface of the crankshaft 6 from the reciprocating member 1 side.

  The large divided body 10a has a protruding portion 10c protruding outward in the radial direction at a substantially central portion in the circumferential direction on the outer peripheral surface thereof. Here, the protruding portion 10c has a truncated truncated cone shape, but may have a polygonal shape, a cylindrical shape, or the like. The main body 71 of the large-diameter portion 7a of the connecting rod 7 is provided with a concave portion 73 into which the concave protruding portion 10c enters radially outward at a position corresponding to the protruding portion 10c on the inner peripheral surface thereof. The concave portion 73 has a shape corresponding to the protruding portion 10c.

  The crankshaft 6, the bearing 10, and the connecting rod 7 can be assembled as follows, for example. First, the main body 71 of the connecting rod 7 and the reciprocating member 1 are assembled, the assembled main body 71 and the reciprocating member 1 are inserted into the crankcase 4 from the opening 41, and the reciprocating member 1 is inserted into the guide member 12. To do. Subsequently, the crankshaft 6 is assembled to the crankcase 4. Subsequently, the large divided body 10 a is inserted into the crankcase 4 from the opening 41 and is externally inserted into the crankshaft 6. The bearing 10 is formed of a high-strength water-resistant resin as described above and has some elasticity. For this reason, the large divided body 10a can be easily extrapolated to the crankshaft 6 by widening the opening in the axial direction view. Since the central angle α of the large divided body 10a is larger than 180 ° as described above, the large divided body 10a does not come off from the crankshaft 6 in the radial direction after being extrapolated to the crankshaft 6.

  Subsequently, the small divided body 10b is inserted into the crankcase 4 from the opening 41 and brought into contact with the outer peripheral surface of the crankshaft 6, and the large divided body 10a and the small divided body 10b are combined. Subsequently, the cap portion 72 is inserted into the crankcase 4 from the opening portion 41, and the main body portion 71 and the cap portion 72 of the connecting rod 7 are connected so that the protruding portion 10c of the bearing 10 engages with the concave portion 73 of the connecting rod 7. The main body portion 71 and the cap portion 72 of the connecting rod 7 are fastened with bolts B and B by being brought into contact with the outer peripheral surface of the bearing 10 and combined. The assembly as described above can be suitably performed by performing the assembly with the opening 41 of the crankcase 4 facing upward in the vertical direction. At this time, since the large divided body 10a is disposed on the lower side in the vertical direction and the small divided body 10b is disposed on the upper side in the vertical direction, the small divided body 10b can be moved in the radial direction from the crankshaft 6 without pressing the small divided body 10b. I can't go wrong.

  Next, the operation of the reciprocating pump 100 will be described. In the reciprocating pump 100, the working fluid is introduced into the flow path R in the crankcase 4 from the water suction port 19, and the driving unit M is driven in a state where the driving unit M is bathed in the working fluid.

  When the crankshaft 6 rotates, the rotary motion is converted into a reciprocating motion by the connecting rod 7 and the piston pin 8 so that the reciprocating member 1 reciprocates, and the plunger 1a moves rearward in the cylinder portion 2 to thereby pump the pump. The chamber 3 is depressurized, and the working fluid is sucked from the flow path R in the crankcase 4 to the pump chamber 3 through the water suction side flow path R1 of the manifold 5 and the water suction valve 22. Subsequently, the plunger 1a moves forward in the cylinder portion 2 to pressurize the pump chamber 3, and the working fluid in the pump chamber 3 is discharged from the discharge port 23 to the outside through the discharge valve 24 and the discharge side flow path R2. Discharged. In this way, the pumping action of sucking and discharging the working fluid is repeated.

  At this time, in the crankcase 4, the working fluid flowing in from the water inlet 19 flows around the crankshaft 6 and forms a flow toward the outlet 20. Then, the working fluid flowing around the crankshaft 6 is supplied to the bearings 9 and 10, and the bearings 9 and 10 are cooled and lubricated.

  Note that a part of the working fluid flowing in from the water suction port 19 passes through the communication path 28 and the annular flow path 27 provided in the protruding portion 4a and the opening 17b provided in the seal case 17 on the back side ( It faces the rear end face) and is introduced into an annular region R3 provided in front of the piston base 1b. A part of the working fluid flowing in from the water suction port 19 is introduced into the region R3 through the recess 1c of the piston base 1b and the communication hole 26 provided in the piston base 1b. By these working fluids, the bearing 11 and the guide member 12 are cooled and lubricated, and the piston base 1b is lubricated.

  As described above, in the reciprocating pump 100 according to the present embodiment, the bearing 10 disposed between the crankshaft 6 and the connecting rod 7 is divided into two or more divided bodies, and a large divided portion that is one of the divided bodies. Since the center angle α of the body 10a is larger than 180 °, the large divided body 10a can be extrapolated so as not to be detached from the crankshaft 6 when the crankshaft 6, the bearing 10 and the connecting rod 7 are assembled. Therefore, the connecting rod 7 can be attached without pressing the bearing 10. Further, since the bearing 10 is made of resin, it has elasticity. Therefore, the large divided body 10a can be easily extrapolated to the crankshaft 6 with its opening when viewed in the axial direction being easily widened. Therefore, in the reciprocating pump 100, assemblability can be improved.

  Further, the large divided body 10a is disposed so as to cover a portion S1 on the reciprocating member 1 side of the outer peripheral surface of the crankshaft 6. For this reason, the division | segmentation location D1, D2 of the bearing 10 is located in the part S2 on the opposite side to the reciprocating member 1 side in the outer peripheral surface of the crankshaft 6. FIG. In the bearing 10, when pressurizing the working fluid, a large load acts on the portion S1 on the reciprocating member 1 side. At this time, in the reciprocating pump 100 according to the present embodiment, the divided portions D1 and D2 of the bearing 10 are located in the portion S2 on the side opposite to the reciprocating member 1 side (that is, the side where the load is small). It can suppress that a big load acts on the division | segmentation location D1, D2 of the bearing 10. FIG. Therefore, durability can be improved.

  Further, since the bearing 10 includes a protruding portion 10c that protrudes in the radial direction, and the connecting rod 7 includes a recess 73 with which the protruding portion 10c is engaged, the connecting rod 7 and the bearing 10 can be easily positioned. Assembling property can be further improved.

  Further, the protrusion 10 c of the bearing 10 and the recess 73 of the connecting rod 7 are engaged with each other, thereby preventing the bearing 10 from being displaced with respect to the connecting rod 7. For this reason, division | segmentation location D1, D2 of the bearing 10 is always located in the part S2 on the opposite side (namely, side with a small load) to the reciprocating member 1 side, and can further improve durability.

  As mentioned above, although the reciprocating pump which concerns on embodiment was demonstrated, this invention is not limited to the said embodiment. For example, in the above embodiment, the protrusion 10 c is provided in the large divided body 10 a in the bearing 10, and the concave portion 73 is provided in the main body 71 in the connecting rod 7, but the protrusion 10 c in the bearing 10 is provided in the small divided body. 10 b, and in the connecting rod 7, the recess 73 may be provided in the cap portion 72.

  Moreover, in the said embodiment, although the projection part 10c is provided in the bearing and the recessed part 73 is provided in the connecting rod 7, the protrusion part which protrudes to radial inside is provided in the connecting rod 7, and is dented in radial inside. A recess may be provided in the bearing 10. In consideration of processing of the inner peripheral surface of the large-diameter portion 7 a of the connecting rod 7, it is preferable to provide the protrusion 10 c on the bearing and the recess 73 on the connecting rod 7 as in the above embodiment.

  Moreover, in the said embodiment, although the projection part 10c is provided in the bearing 10, and the recessed part 73 is provided in the connecting rod 7, the protrusion part 10c and the recessed part 73 do not need to be provided.

  DESCRIPTION OF SYMBOLS 1 ... Reciprocating member, 6 ... Crankshaft, 7 ... Connecting rod, 10 ... Bearing, 10c ... Projection part, 73 ... Recessed part, 100 ... Reciprocating pump, S1 ... The part by the side of a reciprocating member among the outer peripheral surfaces of a crankshaft.

Claims (2)

A reciprocating pump (100) comprising a crankshaft (6), a connecting rod (7) attached to the crankshaft (6), and a reciprocating member (1) attached to the connecting rod (7). And
A cylindrical resin bearing (10) disposed between the crankshaft (6) and the connecting rod (7);
The bearing (10) is divided into two or more divided bodies when viewed in the axial direction, and has a large divided body (10a) having a central angle larger than 180 ° in the divided bodies. The body (10a) is a reciprocating pump (100) arranged so as to cover a part (S1) on the reciprocating member (1) side of the outer peripheral surface of the crankshaft (6 ). One of the connecting rod (7) or the bearing (10) includes a protruding portion (10c) protruding in the radial direction,
It said connecting rod (7) or the other of the bearing (10), the protrusion (10c) contains a recess (73) which engages, reciprocating pump (100) of claim 1 Symbol placement.

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