JP5689484B2 - Plunger journal support structure - Google Patents

Description

  The present invention relates to a journal support structure for a plunger mounted on a vertical plunger pump.

  In the conventional vertical plunger pump, the connecting rod moves up and down by the action of the crank mechanism, and the crosshead to which the connecting rod is connected moves up and down. Two side rods 36 and 36 (see FIG. 2) are connected to the cross head, and an upper cross head 54 is connected to the upper ends of the side rods 36 and 36. A plunger 37 is fixed at the center of the upper cross head 54 (see, for example, FIGS. 1 and 2 of Patent Document 1).

The vertical plunger pump 20 is a pump in which the plunger 37 is driven up and down in a vertical cylinder that communicates with the valve chamber, sucks fluid from the suction valve in the valve chamber, and discharges fluid from the discharge valve. is there.
The plunger 37 of the vertical plunger pump 20 (see FIG. 2) is also referred to as a rod-shaped piston and has high rigidity, and is used for high pressure of 100 atm or more. In addition, the triple continuous plunger pump in which the plunger 37 is a triple type can suppress pulsation due to the reciprocating motion of the plunger pump.

A plunger 37 is fixed to the center of the upper cross head 54 of the plunger mounting portion 21.
A stud bolt 3 of a fastener with screws attached to both ends is screwed to the upper end portion of the plunger 37, and a spherical washer, an upper cross head 54, and a spherical washer are assembled to the stud bolt 3 in order from the bottom. It is fixed from above by the nut 4 of the fastener.

Japanese Patent No. 38199945 (FIGS. 3 and 1)

However, in the conventional three-part plunger pump, a severe load is applied to the spherical washer that supports the upper cross head 54 that moves up and down violently from both sides. There has been a problem that the contact between the convex journal plate and the concave journal plate constituting the washer may change, and the frictional resistance may increase.
For this reason, there is a problem that maintenance man-hours increase because it is necessary to periodically maintain and replace the spherical washer.

  Therefore, an object of the present invention is to provide a plunger journal support structure that can improve the durability of the spherical washer and reduce the number of maintenance steps with a simple configuration.

The journal support structure for the plunger (37) according to claim 1 includes a fastener (3) on the upper part of the plunger (37) that moves up and down in the vertical cylinder (53) communicating with the valve chamber (51). ), The journal support structure of the plunger (37) that holds the upper cross head (54) connected by two sets of spherical washers (1, 2) from the upper surface and the lower surface, the two sets of spherical washers (1 , 2) comprises a convex journal plate (1a, 2a) and a concave journal plate (1b, 2b), and is arranged on the upper surface of the upper cross head (54) of the two sets of spherical washers (1, 2). The upper spherical washer (1) has the convex journal plate (1a) disposed below, and the concave journal plate (1b) is disposed on the convex journal plate (1a).
Of the two sets of spherical washers (1, 2), the lower spherical washer (2) disposed on the lower surface of the upper cross head (54) has the concave journal plate (2b) disposed below, and the concave journal plate The convex journal plate (2a) is placed on top of (2b), and a through hole (through which the fastener (3) formed at the center of the two sets of spherical washers (1, 2) passes ( 1h, 2h), the upper spherical washer (1) and the lower spherical washer (2) are formed on at least one of the convex journal plate (1a, 2a) and the concave journal plate (1b, 2b). Gap portions (1d, 2d), and the gap portions (1d, 2d) are arranged on the outer surfaces of the mating surfaces of the convex journal plates (1a, 2a) and the concave journal plates (1b, 2b). It is formed so as to cover the through holes (1h, 2h) leaving the peripheral edge (1c, 2c), and the convex journal plate (1a, 2a) and the concave journal plate at the outer peripheral edge (1c, 2c). (1b, 2b) is brought into sliding contact.

  The invention according to claim 2 is the journal support structure of the plunger (37) according to claim 1, wherein the gap (1d, 2d) is formed in the concave journal plate (1b, 2b). It is characterized by this.

The invention according to claim 3 is the journal support structure of the plunger (37) according to claim 1, wherein the convex journal plate is arranged in the upper spherical washer (1) and the lower spherical washer (2). (1a, 2a) and a gap (1g, 2g) on the convex journal plates (1a, 2a) so as to cover the through holes (1h, 2h) in the sliding contact surface between the upper cross head (54). ), And slidably contact the convex journal plates (1a, 2a) and the upper crosshead (54) at the outer peripheral edge (1e, 2e) of the slidable contact surface,
It is characterized by.

  The invention according to claim 4 is the journal support structure of the plunger (37) according to claim 1, wherein the lower spherical washer (2) includes the concave journal plate (2b) and the plunger ( 37), a clearance (2f) is further formed in the concave journal plate (2b) so as to cover the through hole (2h) in the sliding contact surface with the sliding contact surface, and the concave shape is formed at the outer peripheral edge (2i) of the sliding contact surface. The journal plate (2b) and the plunger (37) are brought into sliding contact with each other.

  According to the invention according to claim 1, since the hitting place can be expanded from the central part to the outer periphery and limited to a circular hitting surface having a larger diameter, it can be supported. The hit can be prevented from changing. As a result, a constant contact surface can be secured at all times and the upper crosshead can be stably supported.

In addition, since the gap portion is formed on the spherical sliding surface of the spherical washer, the gap portion can be filled with grease (lubricating oil), and the grease can be held for a long time.
For this reason, sufficient grease can be supplied to the sliding contact surface over a long period of time, reducing the friction coefficient of the sliding contact surface to suppress wear, effectively preventing galling and seizure, and a spherical washer. This can improve the durability and reduce maintenance man-hours.

  According to the second aspect of the present invention, since the gap is formed in the concave journal plate, the grease can be easily held as a grease reservoir. In addition, the gap can be easily formed by cutting a cutting tool when processing a spherical surface with a spherical processing lathe.

  According to the invention of claim 3, since the gap portion can hold the grease as a grease reservoir, the friction coefficient can be reduced and the durability can be improved. In addition, by bringing the convex journal plate and the upper cross head into sliding contact with the outer peripheral edge of the sliding contact surface, the contact surface can be limited to the outer peripheral edge on the outer peripheral side, so that stable seating is ensured. As a result, rattling of the convex journal plate due to vibration can be suppressed and stronger struts can be achieved, so that the durability of the spherical washer can be improved.

  According to the invention which concerns on Claim 4, since a clearance gap can hold | maintain grease as a grease pool, a friction coefficient can be made small and durability can be improved. In addition, since the contact surface can be limited to the outer peripheral edge portion on the outer peripheral side by sliding the concave journal plate and the plunger in sliding contact with the outer peripheral edge portion of the sliding contact surface, stable seating is ensured. As a result, rattling of the concave journal plate due to vibration can be suppressed and stronger struts can be achieved, so that the durability of the spherical washer can be improved.

It is the side view which partially cut off the 3 simultaneous type plunger pump of this invention. It is sectional drawing of the AA line shown in FIG. The support structure of the plunger of the vertical plunger pump of this invention is shown, (a) is the B section enlarged view shown in FIG. 2, (b) is an expanded sectional view of the concave journal plate which comprises a spherical washer.

The triple simultaneous plunger pump according to the embodiment will be described in detail with reference to the drawings.
FIG. 1 is a partially cutaway side view of a three-column plunger pump of the present invention, and FIG. 2 is a cross-sectional view of the three-column plunger pump shown in FIG.
As shown in FIG. 1, the main part of the triple simultaneous plunger pump 20 includes a crank mechanism 33 and a frame 22 containing three cross heads 34, 34, 34, and three pieces fixed to the top of the frame 22. And a plunger mounting portion 21 which is installed on the upper end portion of a pair of side rods 36 and 36 connected to each cross head 34 and to which a plunger 37 is fixed. Yes.
A plunger 37 (also referred to as a rod-like piston) fixed to the plunger mounting portion 21 is driven up and down in a vertical cylinder 53 communicating with the valve chamber 51 of the intermediate valve casing 35.

The crank mechanism 33 includes a crankshaft 39 (see FIG. 1) formed with three pins 38, 38, 38, three connecting rods 41, 41, 41, etc. connected to the crosshead pins 40 corresponding to the pins 38. The crankshaft 39 is supported at both ends and intermediate portions by bearings 42, 42, 42, 43.
The three pins 38, 38, 38 formed on the crankshaft 39 are arranged at equal intervals with an interval of 120 degrees in the circumferential direction around the rotation axis 45 of the crankshaft 39.

  As shown in FIG. 2, each valve casing 35 is provided with a rectangular parallelepiped block 46 having a hollow valve chamber 51, lids 47 and 47 for sealing both ends of the hollow portion, and the inside of the hollow portion. The intake valve 48 and the discharge valve 49 are configured. Each valve casing 35 sucks water into the valve chamber 51 from the common suction passage 50 through each suction valve 48 when the plunger 37 is in the upward stroke, and when the plunger 37 is in the downward stroke. The high pressure water is discharged from the valve chamber 51 through the discharge valves 49 to the common discharge flow path 52.

<Configuration of journal support structure>
3A and 3B show a plunger journal support structure, in which FIG. 3A is an enlarged view of a portion B shown in FIG. 2 and FIG. 3B is an enlarged cross-sectional view of a concave journal plate constituting a spherical washer.
Hereinafter, the spherical washer disposed on the upper surface of the upper cross head 54 is referred to as the upper spherical washer 1 and the spherical washer disposed on the lower surface of the upper cross head 54 is referred to as the lower spherical washer 2.
As shown to (a) of FIG. 3, the stud bolt 3 of the fastener with which the upper end surface of the plunger 37 of the plunger attachment part 21 was threaded at both ends is screwed. The lower spherical washer 2 is inserted into the stud bolt 3, the upper cross head 54 is inserted, the upper spherical washer 1 is inserted, and these are plungerd by the nut 4 provided at the upper end of the stud bolt 3. 37 is fixed.

<Configuration of upper spherical washer>
As shown in FIG. 3A, the upper spherical washer 1 has a convex journal plate 1a disposed on the upper surface of the upper cross head 54, and a concave journal plate 1b so as to cover the convex spherical surface. Is arranged and fixed thereon with a fastener nut 4.
That is, the upper spherical washer 1 is composed of a convex journal plate 1a and a concave journal plate 1b.

<Configuration of lower spherical washer>
As shown in FIG. 3A, the lower spherical washer 2 has a concave journal plate 2b disposed on the upper end surface of the plunger 37, a convex journal plate 2a disposed thereon, and an upper crosshead disposed thereon. 54 is arranged.
That is, the lower spherical washer 2 is constituted by a convex journal plate 2a and a concave journal plate 2b.

<Configuration of concave journal plate>
Since the concave journal plate 1b and the concave journal plate 2b have the same shape, the concave journal plate 2b will be described, and the description of the concave journal plate 1b will be omitted.
As shown in FIG. 3B, the outer shape of the concave journal plate 2b is about φ117 mm, the thickness is about 37.8 mm, the upper surface is formed as a concave spherical depression, and the radius of the spherical surface is about 105 mm. A gap portion 2d (1d) having a depth of 1 mm is provided so as to cover the through hole 2h (1h) while leaving the outer peripheral edge portion 2c (1c) of the spherical surface. That is, the gap 2d (1d) drives the spherical surface of the concave journal plate 2b into a circular shape including the through-hole 2h (1h) at a depth of 1 mm, and escapes the sliding contact surface. The space by this escape is called gap part 2d (1d).
The gap 2d (1d) is, for example, φ100 mm in plan view.
In addition, a clearance 2f (1f) is provided on the lower surface, leaving the outer peripheral edge 2i (1i). In plan view, the gap 2f (1f) is formed in a circular shape having a depth of about φ100 mm and a depth of 1 mm including the through hole 2h (1h).

<Configuration of convex journal plate>
Since the convex journal plate 1a and the convex journal plate 2a have the same shape, the convex journal plate 2a will be described, and the description of the convex journal plate 1a will be omitted.
As shown in FIG. 3A, the outer shape of the convex journal plate 2a is about φ117 mm, the thickness is about 30 mm, and the lower surface that fits into the concave spherical recess is a convex spherical surface. The radius is about 105 mm.
In addition, a clearance 2g (1g) having a depth of 1 mm is provided on the upper surface, leaving the outer peripheral edge 2e (1e). The gap 2g (1g) in a plan view is a circle having a diameter of about φ100 mm.

Further, the upper cross head is arranged such that the center of the curvature circle of the upper spherical washer 1 arranged on the upper surface of the upper cross head 54 and the center of the curvature circle of the lower spherical washer 2 arranged on the lower surface of the upper cross head 54 coincide. Due to the thickness of 54, the upper spherical washer 1 and the lower spherical washer 2 are separated.
Thus, by aligning the centers of curvature of the spherical surfaces of the two outer peripheral edge portions 1c and the outer peripheral edge portion 2c, the self-aligning action by both spherical sliding surfaces works without any trouble.
The gap 2d (1d), the gap 2g (1g), and the gap 2f are grease reservoirs filled with grease.

As shown by the thick line in FIG. 3A, there are five grease filling points.
Grease filling locations in the upper spherical washer 1 include a spherical gap 1d of the concave journal plate 1b and a gap 1g provided at the center of the end surface of the convex journal plate 1a that is in sliding contact with the upper surface of the upper cross head 54. There are two places.
Grease filling locations in the lower spherical washer 2 include a spherical gap 2d of the concave journal plate 2b, and a gap 2g provided at the center of the end surface of the convex journal plate 2a that is in sliding contact with the lower surface of the upper cross head 54, There are three gaps 2f provided at the center of the end surface of the concave journal plate 2b that is in sliding contact with the upper end surface of the plunger 37.
Since the spherical gap 1d and the spherical gap 2d are filled with grease, and the grease can be held and supplied over a long period of time, the friction coefficient can be reduced. The durability of 1 and the lower spherical washer 2 can be improved.
In addition, by providing a grease reservoir that can be filled with grease at the gaps 1g and 2g and the gap 2f, the amount of wear that slides and friction during fine vibrations is reduced, and fine wear is prevented. can do.
Further, the outer peripheral edge portion 1e that forms the gap portion 1g, the outer peripheral edge portion 2e that forms the gap portion 2g, and the outer peripheral edge portion 2i that forms the gap portion 2f make the contact surface ring-shaped on the outer peripheral edge portion on the outer peripheral side. Therefore, the seating is stable, the rattling of the convex journal plate due to vibration is suppressed, and a stronger strut can be achieved, so that the durability of the spherical washers 1 and 2 can be improved.
Furthermore, since the grease has a rust preventive action to prevent corrosion, corrosion of the spherical washers 1 and 2 is prevented.

In particular, by supplying grease to the spherical gaps 1d and 2d, the friction coefficient of the slidable contact surfaces of the spherical surfaces of the convex journal plates 1a and 2a and the concave journal plates 1b and 2b is increased from 0.10 to 0.01. Therefore, when the plunger 37 moves up and down, it slides on the sliding surface of the spherical surface even if there is an eccentric load due to an instantaneous bending moment. It is possible to suppress the uneven load.
In addition, the supply of grease to the gaps 1g, 2g, 2f suppresses fine friction caused by fine vibrations and stabilizes the seating on the upper end surface of the plunger 37. Therefore, the life of the upper spherical washer 1 and the lower spherical washer 2 is increased. improves.
Furthermore, grease is semi-solid and has a strong viscosity, so it will not be washed away. For example, the grease filled in the gap 1d can lubricate the outer peripheral edge 1c of the spherical surface of the upper spherical washer 1 and prevent water droplets from entering.

<Description of operation of vertical plunger pump>
As shown in FIG. 1, the operation of the plunger 37 disposed at the upper center of the three-unit plunger pump 20 will be mainly described.
When a motor shaft of a drive motor (not shown) rotates, a crankshaft 39 connected to the motor shaft rotates.
When the crankshaft 39 rotates, the connected connecting rod 41 moves the crosshead 34 connected by the crosshead pin 40 up and down.

  As shown in FIG. 2, when the cross head 34 moves up and down, the two side rods 36 and 36 and the upper cross head 54 connected to the upper ends of the side rods 36 and 36 move up and down. Since the upper end of the plunger 37 is fixed at the center of the upper cross head 54, the plunger 37 moves up and down in the cylinder 53 as a rod-like piston.

In the downward stroke in which the plunger 37 descends, high pressure water is discharged from the valve chamber 51 through the discharge valves 49 to the common discharge flow path 52. Further, in the upward stroke of the plunger 37, water is sucked into the valve chamber 51 from the common suction passage 50 through each suction valve 48.
At this time, due to the vertical movement of the cross head 34, the upper cross head 54 connected to the two side rods 36, 36 also moves up and down. The plunger 37 connected to the upper cross head 54 while being bent and vibrated by the two side rods 36, 36 is supported by the two sets of the upper spherical washer 1 and the lower spherical washer 2, and has a self-aligning action. Demonstrate.
As a result, even with such a simple configuration, the durability of the upper spherical washer 1 and the lower spherical washer 2 can be improved, and the number of maintenance steps can be reduced.

The present invention can be variously modified and changed within the scope of the technical idea.
As shown in FIG. 3, here, the gap portions 1d and 2d are provided in the concave journal plates 1b and 2b, but the gap portions 1d and 2d of the grease reservoir may be provided in the convex journal plates 1a and 2a. You may provide in both.
Further, the processed shape of the gap portions 1d and 2d of the grease reservoir is provided by cutting the radius of curvature by 1 mm from the spherical surface of SR105. However, a recess or a hole can be processed by a tool such as a drill or an end mill to form a grease reservoir. It may be good, and you may manufacture by other shapes and processing methods, such as hollow processing by press processing.
Further, the lower spherical washer 2 and the upper spherical washer 1 are provided with gaps 1f and 2f as a common product. However, the gap 1f of the concave journal plate 1b of the upper spherical washer 1 serves as a seat for the nut 4, and a grease reservoir. Therefore, the gap portion 1f may be omitted.

1 Journal plate (upper spherical washer)
1a Convex journal plate 1b Concave journal plate 1c Outer peripheral edge (spherical sliding contact surface)
1d Clearance 1e, 1i Outer peripheral edge 1f, 1g Clearance 2 Journal plate (lower spherical washer)
2a Convex journal plate 2b Concave journal plate 2c Outer peripheral edge (spherical sliding contact surface)
2d Clearance 2e, 2i Outer peripheral edge 2f, 2g Clearance 3 Stud bolt (fastener)
4 Nut (fastener)
20 Vertical Plunger Pump 21 Plunger Mounting Part 34 Crosshead 36 Side Rod 37 Plunger 54 Upper Crosshead

Claims (4)

Two sets of upper crossheads (54) connected by a fastener (3) to the upper part of a plunger (37) that moves up and down in a vertical cylinder (53) communicating with the valve chamber (51) from the upper surface and the lower surface The journal support structure of the plunger (37) sandwiched between the spherical washers (1, 2) of
The two sets of spherical washers (1, 2) are composed of convex journal plates (1a, 2a) and concave journal plates (1b, 2b),
Of the two sets of spherical washers (1, 2), the upper spherical washer (1) disposed on the upper surface of the upper cross head (54) has the convex journal plate (1a) disposed below, and the convex shape Arranging the concave journal plate (1b) over the journal plate (1a),
Of the two sets of spherical washers (1, 2), the lower spherical washer (2) disposed on the lower surface of the upper cross head (54) has the concave journal plate (2b) disposed below, and the concave journal plate (2b) is placed over the convex journal plate (2a),
A through hole (1h, 2h) through which the fastener (3) formed at the center of the two sets of spherical washers (1, 2) passes;
The upper spherical washer (1) and the lower spherical washer (2) are:
A gap (1d, 2d) formed in at least one of the convex journal plate (1a, 2a) and the concave journal plate (1b, 2b),
The gaps (1d, 2d) are formed on the through holes (1h), leaving the outer peripheral edges (1c, 2c) at the mating surfaces of the convex journal plates (1a, 2a) and the concave journal plates (1b, 2b). , 2h), and by sliding the convex journal plate (1a, 2a) and the concave journal plate (1b, 2b) at the outer peripheral edge (1c, 2c),
The journal support structure of the plunger (37) characterized by the above. The gaps (1d, 2d) are formed in the concave journal plates (1b, 2b);
The journal support structure of the plunger (37) according to claim 1, characterized in that: In the upper spherical washer (1) and the lower spherical washer (2), the through holes (1h, 2h) in the sliding contact surface between the convex journal plate (1a, 2a) and the upper cross head (54) Further, gap portions (1g, 2g) are formed in the convex journal plates (1a, 2a) so as to cover the convex journal plates (1a, 2a). ) And the upper crosshead (54) in sliding contact with each other,
The journal support structure of the plunger (37) according to claim 1, characterized in that: In the lower spherical washer (2), a gap is further formed in the concave journal plate (2b) so as to cover the through hole (2h) in the sliding contact surface between the concave journal plate (2b) and the plunger (37). Forming a portion (2f), and sliding the concave journal plate (2b) and the plunger (37) at the outer peripheral edge (2i) of the sliding contact surface;
The journal support structure of the plunger (37) according to claim 1, characterized in that:

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