JPH0429093Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a plunger of a plunger pump, and more specifically, the plunger of a plunger pump has a proximal member on the proximal side and a distal side member on the distal side in the axial direction. This invention relates to a plunger pump in which the distal end member is detachably connected to the proximal end member.

[Conventional technology]

In order to improve the wear resistance and corrosion resistance of the plunger in a plunger pump and to facilitate replacement of worn and corroded parts, it has been conventional to separate the plunger in the axial direction into a base end member on the base end side and a tip end member on the tip end side, removably connect the tip end member to the base end member, and use a centering member made of a wear-resistant and corrosion-resistant material such as ceramic.

If the centering of the proximal end member and the distal end member is inaccurate, it may cause uneven wear of the distal end member, so it is necessary to accurately align the proximal end member and the distal end member. be.

Therefore, Utility Application No. 112287 (Sho 58-)
In the plunger disclosed in Japanese Patent No. 19163, the proximal member and the distal member are fitted by fitting the distal end portion of the proximal member and the proximal end portion of the distal member into the outer peripheral portions of one and the other of the centering members, respectively. The aim is to achieve accurate centering. The distal end surface of the distal side member faces the pump chamber, and the liquid in the pump chamber easily enters the tightening bolt insertion hole of the distal side member from between the head of the tightening bolt and the distal end surface of the distal side member. ,
A packing is interposed between the head of the tightening bolt and the distal end surface of the distal end member, and the tightening bolt is used to tighten the bolt. On the other hand, since the joint between the distal end member and the proximal member faces the suction port of the plunger pump, and the hydraulic pressure applied to the joint is small, no particular consideration has been given to the sealing structure.

[Problem that the invention attempts to solve]

However, since the joint between the distal member and the proximal member is also subject to a low but constant hydraulic pressure, during prolonged use of the plunger pump, liquid will enter the centering member from this joint. The shaft portion of the tightening bolt for removably fixing the distal side member to the proximal side member passes through the distal side member and the centering member, so that the joint surface between the distal side member and the proximal side member The liquid that has entered through the centering member passes through the circumference of the centering member and advances to the shaft of the tightening bolt, which may cause corrosion of the threaded portion of the shaft.

The purpose of this invention is to connect the proximal member and the distal member by fitting the distal end of the proximal member and the proximal end of the distal member into the outer peripheral portions of one and the other of the centering members, respectively. In a plunger that aims for accurate centering, this invention prevents corrosion of the tightening bolt for connecting the distal side member and the proximal side member due to liquid that enters through the joint surface of the distal side member and the proximal side member, and An object of the present invention is to provide a plunger for a plunger pump that can streamline assembly work.

[Means for solving problems]

The configuration of this invention will be explained with reference to drawings corresponding to embodiments. In the plunger 15, the distal side member 36 is connected to the proximal side member 1 on the distal side of the proximal side member 16.
a centering member 38 disposed coaxially with respect to 6;
are fitted into respective recesses 40 and 42 in the distal end portion of the proximal end member 16 and the proximal end portion of the distal end member 36 at one and the other outer peripheral portions thereof. The tightening bolt 44 passes through the distal member 36 and the centering member 38 at its shaft portion 48 and is threaded into the proximal member 16 at the distal end of the shaft portion 48 to connect the distal member 36 to the proximal member. 16. The packing 50 is interposed between the head 46 of the tightening bolt 44 and the distal end surface of the distal end member 36. The centering member 38 has a flange portion 39 interposed at the joint surface between the base end member 16 and the distal end member 36.
It has integrally. A plurality of annular protrusions 52 are formed on both end faces of the flange portion 39 so as to be substantially concentric with the center line of the centering member 38, and these annular protrusions 52 are connected to the proximal member 16 by the tightening bolt 44. It is deformed by tightening with the distal end member 36 and comes into close contact with the joint surface of the proximal end member 16 and the distal end member 36.

[Effect]

The flange portion 39 of the centering member 38 is interposed between the joint surface of the proximal end member 16 and the distal end member 36,
As the proximal end member 16 and the distal end member 36 are tightened in the axial direction by the tightening bolts 44, they are compressed in the axial direction. As a result, the annular convex portions 52 on both end faces of the flange portion 39 are compressed and deformed.
The proximal end member 16 and the distal end member 36 are in close contact with the joint surfaces, and each annular convex portion 52 in the close contact state functions as a seal. Liquid pressure is applied to the outer periphery of the joint between the distal end member 36 and the proximal end member 16, and liquid attempts to enter the joint, but due to the annular convex portion 52 in a tight state having a sealing function, The shank 48 of the tightening bolt 44, and in particular its threaded portion, cannot be reached.

〔Example〕

FIG. 4 is a schematic longitudinal sectional view of the entire plunger pump 10. FIG. In the plunger pump 10, a crankshaft 12 is rotatably supported by a crankcase 14 at both ends thereof. The proximal end member 16 of the plunger 15 is made of metal such as stainless steel, constitutes a crosshead, and is guided in the horizontal direction by a guide portion 18 of the crankcase 14. The connecting rod 20 is rotatably coupled at both ends to the crankshaft 12 and the proximal end of the proximal member 16, respectively, and transmits power from the crankshaft 12 to the proximal end of the proximal member 16. Manifold 2
2 is joined to the crankcase 14, and the intake port 2
4, has a pump chamber 26 and a discharge port 28.
The suction valve 30 and the discharge valve 32 are respectively connected to the suction port 2.
4 and the pump chamber 26 and between the pump chamber 26 and the discharge port 28. The cylinder member 34 is fitted into the manifold 22 and the plunger 15
The distal end member 36 is capable of sliding on the inner circumferential surface of the cylinder member 34. The distal member 36 is made of a wear and corrosion resistant material such as ceramic.

FIG. 1 is a detailed longitudinal sectional view of the tip of the plunger 15. The recesses 40 and 42 are located in the proximal member 1.
6 and the distal end member 36 are formed to open at their joint surfaces. Centering member 38
has a flange portion 39 integrally at approximately the center in the axial direction, and the outer circumferential portions on both sides of the centering member 38 with respect to the flange portion 39 fit into the circumferential surfaces of the respective recesses 40 and 42. By this, the proximal end member 16 and the distal end member 36 are centered.
The tightening bolt 44 includes a head 46 and a shaft portion 48, and the shaft portion 48 passes through the distal end member 36 and the centering member 38, and is screwed into the distal end portion of the proximal member 16 at the distal end portion. . The distal end member 36 is detachably connected to the proximal end member 16 by a tightening bolt 44 . The packing 50 is the tightening bolt 44
is interposed between the head 46 of the tightening bolt 44 and the distal end surface of the distal end member 36 , and liquid flows from between the head 46 of the tightening bolt 44 and the distal end surface of the distal end member 36 .
Prevent them from entering the room.

FIG. 2 is an enlarged longitudinal sectional view of the centering member 38;
The figure is a sectional view taken along the - line in FIG. 2. A plurality of annular convex portions 52 are provided on both end surfaces of the flange portion 39 and are approximately concentric with the center line of the centering member 38.
Each annular protrusion 52 is made of a material that can be plastically or elastically deformed by compression. The entire flange portion 39 may be made of metal like the main body portion of the centering member 38, and the top of the annular protrusion 52 may be made into an angular shape, so that the annular protrusion 52 can be plastically deformed by compression. Further, the flange portion 39 has a two-layer structure consisting of a disk portion as a core and a covering portion that covers the surface of this disk portion, the disk portion is made of metal like the main body portion of the centering member 38, and the covering portion By using an elastic body such as rubber, each annular convex portion 52 can be elastically deformed by compression.

The flange portion 39 of the centering member 38 is interposed between the joint surface of the proximal member 16 and the distal member 36,
As the proximal end member 16 and the distal end member 36 are tightened in the axial direction by the tightening bolt 44, they are compressed in the axial direction. As a result, the annular convex portions 52 on both end faces of the flange portion 39 are compressed and deformed.
The proximal end member 16 and the distal end member 36 are in close contact with the joint surfaces, and each annular convex portion 52 in the close contact state functions as a seal. Liquid pressure is applied to the outer periphery of the joint between the distal end member 36 and the proximal end member 16, and the liquid attempts to enter the joint, but because of the annular convex portion 52 in a tight state with a sealing function, The shank 48 of the tightening bolt 44, and in particular its threaded portion, cannot be reached.

[Effect of idea]

In this way, in this invention, the distal end of the proximal member and the recesses of the proximal end of the distal member are fitted into the outer circumferential portions of one and the other of the centering members, respectively. In a plunger that aims at accurate centering with the distal end member, the centering member is
It has an integral flange portion interposed between the joining surfaces of the proximal side member and the distal side member, and a plurality of annular convex portions are provided on both end surfaces of the flange portion approximately concentric with the center line of the centering member. It is formed as follows. This annular convex portion deforms as the proximal member and the distal member are tightened in the axial direction by the tightening bolt, and comes into close contact with the joint surfaces of the proximal member and the distal member, thereby functioning as a seal. . In addition, since multiple seals are formed at the joint between the proximal member and the distal member, the seal at the joint as a whole becomes more complete, and despite the hydraulic pressure around the outer periphery of the joint, It is possible to prevent liquid from entering the joint between the side member and the proximal member, thereby preventing liquid from entering the shaft of the tightening bolt and corroding the threaded portion of the shaft.

In this invention, the flange portion having an annular convex portion as a seal interposed between the joint surface of the distal end member and the proximal end member is integrally formed with the centering member, so that when assembling the plunger, , the centering member and the flange portion do not separate, making the assembly work more efficient.

[Brief explanation of drawings]

The drawings relate to an embodiment of this invention, and FIG. 1 is a detailed longitudinal sectional view of the tip of the plunger, FIG. 2 is an enlarged longitudinal sectional view of the centering member, and FIG. 3 is a cross-sectional view of the centering member.
FIG. 4 is a schematic longitudinal sectional view of the entire plunger pump. 10...Plunger pump, 15...Plunger, 16...Proximal side member, 36...Distal side member,
38... Centering member, 39... Flange portion, 4
0,42...Recess, 44...Tightening bolt, 4
6...Head, 48...Shaft, 50...Putskin,
52...Annular convex portion.

Claims (1)

[Scope of utility model registration request] A distal side member 36 is disposed on the distal side of the proximal side member 16 coaxially with respect to the proximal side member 16, and a centering member 38 is disposed on the proximal side member 16 at one and the other outer peripheral portion thereof. recesses 40 and 42 in the distal end of the distal end and the proximal end of the distal end member 36, respectively.
, and the tightening bolt 44 is inserted into its shaft portion 48.
It passes through the distal side member 36 and the centering member 38 and is screwed into the proximal side member 16 at the distal end of the shaft portion 48 to join the distal side member 36 to the proximal side member 16. Patsukin 5
0 is interposed between the head 46 of the tightening bolt 44 and the distal end surface of the distal end member 36, the centering member 38 is interposed between the proximal end member 16 and the distal end surface of the distal end member 36. It has an integral flange portion 39 interposed at the joint surface with the distal end member 36, and a plurality of annular convex portions 52 are provided on both end surfaces of the flange portion 39 approximately concentrically with respect to the center line of the centering member 38. These annular convex portions 52 are deformed by tightening of the proximal end member 16 and the distal end member 36 by the tightening bolt 44, and the annular convex portions 52 deform to form a joint surface between the proximal end member 16 and the distal end member 36. A plunger of a plunger pump characterized by being in close contact with.