JPS6357879A - Plunger pump - Google Patents

Abstract

PURPOSE:To enable replacement of a seal member without disassembling a manifold, by a method wherein a seal case is removably mounted on the tip side of a plunger to a seal case, and a seal member, over which the plunger is slid, is situated in the seal case. CONSTITUTION:A manifold 66 is formed with a first part 68, joined to a crank case 52 and in which a plunger 60 is inserted, and a second part 70 mounted to the first part. A polygonal head part 84 is mounted to a seal case 82, and the second part 70 is fastened against the first part 68 by means of the head part 84. A pump chamber 86 is partitioned from the interior of the seal case 82 by means of the tip side of the plunger 60. A high pressure seal 102 is disposed to an inner peripheral part 96 located on the side located deep in the seal case 82, and a low pressure seal 106 is disposed to an inner peripheral part 98 on the inlet side. This constitution, when the seals 102 and 106 are replaced, removes the seal case 82 without disassembling the manifold 66 but by unfastening the second part through rotation of the head part 84.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plunger pump in which a sealing member of a sliding portion of a plunger can be easily replaced.

[Prior Art] FIG. 3 is a cross-sectional view of a conventional plunger pump, in which a manifold 10 has a first manifold portion 14 joined to a crankcase 12, a pump chamber 16 defined therein, and is attached using bolts 18. The first manifold section 14
A second manifold portion 20 is joined to the second manifold portion 20. The suction port 22 is provided in the first manifold section 14 and communicates with the pump chamber 16 via a suction passage 24 in the second manifold section 20 . The suction valve 26 is disposed within the suction passage 24 and is connected from the pump chamber 16 to the suction port 22.
Prevent backflow of liquid to. The discharge passage 28, like the suction passage 24, is formed in the second manifold section 20 and communicates with the pump chamber 16, and the discharge valve 30 is disposed within the discharge passage 28 and communicates with the pump chamber in the discharge passage 28. 16
Prevents backflow of liquid towards. The seal case 32 is
The plunger 34 is disposed on the inner circumferential side of the first manifold portion 14 , and the plunger 34 is inserted into the inner circumferential side of the seal case 32 .

The high pressure seal 36 and the low pressure seal 38 are in the seal case 32.
The plunger 34 slides on the inner periphery of the high-pressure seal 36 and the low-pressure seal 38. . The high-pressure seal retainer 40 is disposed coaxially with the high-pressure seal 36 on the inner periphery of the boundary between the second manifold portion 20 and the seal case 32, and
The compression coil spring 4 is in contact with a step on the inner circumference of the second manifold part 20 on the second manifold part 20 side.
2, the high pressure seal 36 is urged toward the crankcase 12 to press the high pressure seal 36 in the axial direction. The low-pressure seal retainer 44 is fixed to the end face of the first manifold portion 14 on the crankcase 12 side, and presses the low-pressure seal 38 toward the back to prevent the low-pressure seal 38 from coming off. The through hole 46 is formed in the seal case 32 so as to extend in the radial direction thereof, and allows the hydraulic pressure in the suction port 22 to be transferred between the plunger 3 and the high pressure seal 36 and the low pressure seal 38 in the axial direction.
4 into the radial gap on the outer circumferential side. Lubricating oil injection hole 4
8 is formed in the first manifold section 14 to extend in its radial direction, and guides lubricating oil injected from the outside of the first manifold section 14 to the low pressure seal 38 .

High pressure seal 36 and low pressure seal 38 are connected to plunger 34
As it slides, it wears out, so it needs to be replaced and inspected. In that case, after removing the second manifold part 20 from the first manifold part 14, the seal case 3
2 from the first manifold section 14 and the high pressure seal 36 and low pressure seal 38 are replaced and inspected.

[Problems that Rihan tries to solve] In conventional plunger pumps, the following problems occur when replacing the high pressure seal 36 and the low pressure seal 38 when the plunger pump is large.

(1) Since the first manifold portion 14 has a large weight, large-scale tools and jigs are required to attach and detach the second manifold portion 20 when replacing the high pressure seal 36 and the low pressure seal 38, etc. .

(2) When installing the plunger pump, take into consideration the subsequent replacement of the high pressure seal 36 and low pressure seal 38, etc.
) It is necessary to secure a space for bringing tools, etc., and this is a major constraint on the installation location of the plunger pump.

(3) It is necessary to attach and detach the second manifold part 20, which has a large weight, which increases the risk of replacing the high pressure seal 36 and the low pressure seal 38, and also reduces work efficiency and makes maintenance troublesome. It has become.

[Means for Solving the Problems] According to the plunger pump according to the present invention, the seal case receives the plunger and has a pump chamber therein, and the seal case is connected to the manifold on the tip side of the plunger. A seal member that is removably attached and on which the plunger slides is removably fitted into the inner periphery of the seal case.

[Operation] Since the end of the seal case is exposed to the outside of the manifold, when replacing the seal member, the end of the seal case is grasped from the outside of the manifold and the seal case is inserted into and removed from the manifold.

[Example code] This invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 shows the entire plunger pump according to the present invention together with its driving section. The crankshaft 50 is disposed within a crankcase 52, and an opening at the end opposite to the plunger pump is covered by a lid 54. Oil filler port 56
and a drain 58 are provided at the upper and lower parts of the crankcase 52, respectively, new lubricating oil is injected into the crankcase 52 from the oil filler port 56, and old lubricating oil is discharged from the drain 58 to the outside of the crankcase 52. . The plunger 60 is connected to the crank 4i via a connecting rod 62.
Power is transmitted from 11150, and it reciprocates as the crankshaft 50 rotates. oil seal 6
4 is disposed at a penetration portion of the plunger 60 in the crankcase 52.

The inside of the crankcase 12 is kept liquid-tight.

FIG. 1 is an enlarged view of the main parts of the plunger pump shown in FIG. Second manifold section 7 joined to first manifold section 68
Consists of 0. The suction lower 2 is formed in the first manifold part 68, the suction passage 74 of the second manifold part 70 communicates with the suction lower 2, and the suction valve 76 is formed in the suction passage 7.
4 to open the suction passage 74 during the suction stroke of the plunger 60. A discharge valve 80 is formed in the second manifold section 70 like the suction passage 74, and the discharge valve 80 is disposed in the discharge passage 78 to open the seal case 82 during the discharge stroke of the plunger 60.

The seal case 82 has a polygonal head 84 whose outer shape has been enlarged and can lock a predetermined tool, and is screwed into a hole on the second manifold part 70 side of the first manifold part 68. Second manifold section 70 by head 84
is tightened to the first manifold section 68. The pump chamber 86 is partitioned inside the seal case 82 on the distal end side of the plunger 6o. The annular passage 88 has a seal case 82 in the same position as the pump chamber 86 in the axial direction.
A through hole 90 extends in the radial direction of the seal case 82 and communicates the pump chamber 86 with the annular passage 88 . As a result, the pump chamber 86 is connected to the seal case 82.
It communicates with the suction passage 74 and the discharge passage 78 through the through hole 90 and the annular passage 88 regardless of the rotational position of the . The O-ring 92 is connected to the first manifold portion 6 of the seal case 82.
It is fitted into an annular groove on the outer periphery of the end on the 8 side to prevent liquid leakage at the joint between the first manifold portion 68 and the seal case 82. ○ Rings 94 and 95 are fitted into annular grooves on the outer periphery of the seal case 82 on both sides of the annular passage 88 in the axial direction, and are connected to the second manifold part 7.
An annular passage 88 at the junction between 0 and the seal case 82
This prevents fluid from leaking.

An inner periphery 96.98 that is gradually larger than the inner diameter of the pump chamber 86 is formed on the inner periphery of the end on the first manifold portion 68 side of the seal case 82 and on the artificial side. At 96, a compression coil spring 100 is connected to a high pressure seal 10.
A compression coil spring 100 and a high-pressure seal 102 are arranged so as to be deeper than 2, and a seal presser 104 is arranged on the inner circumferential portion 98 on the inlet side so as to come into contact with the end of the high-pressure seal 102. The low pressure seal 106 is disposed on a stepped portion of the inner circumference of the seal presser 104, and a C-shaped stopper 108 is fixed to the inner circumference of the seal presser 104 to prevent the low pressure seal 106 from coming off. When the seal case 82 is screwed onto the first manifold part 68 and the assembly to the first manifold part 68 is completed, the end of the seal holder 104 on the crankcase 52 side is in contact with the first manifold part 68. In this state, the seal presser 104 presses the high pressure seal 102 toward the compression coil spring 100 against the compression coil spring 100.

The outer circumference of plunger 60 slides on the inner circumferences of high pressure seal 102 and low pressure seal 106.

The through hole 110 is connected to the seal case 82 and the seal presser 104.
is formed to extend in the radial direction of the lower pressure seal 102 and the low pressure seal 1 in the axial direction to transfer the hydraulic pressure of the suction lower 2.
06 and into the radial gap on the outer peripheral side of the plunger 60. A lubricating oil injection hole 112 is formed in the first manifold portion 68 and extends in the radial direction thereof.
Lubricating oil injected from outside of first manifold section 68 is directed to low pressure seal 106 .

The high pressure seal 102 and the low pressure seal 106 are connected to the plunger 6
When the high-pressure seal 102 and low-pressure seal 106 become worn due to the IH operation of 0, it becomes necessary to replace or inspect them.

A suitable tool is engaged with the head 84 of the seal case 82 and the seal case 82 is rotated to loosen it. Since the second manifold part 70 is attached and fixed to the first manifold part 68 by bolts 71, the seal case 82 can be removed from the manifold 66 without disassembling the manifold 66. After the seal case 82 is removed from the manifold 66 in this way, the high pressure seal 10
2 and the low pressure seal 106 from the seal case 82,
High pressure seal 102 and low pressure seal 106 are inspected or replaced with new ones, and seal case 82 is again screwed onto first manifold section 68 .

[Effects of the Invention] As described above, in this invention, since the seal case is partially exposed to the outside of the manifold, the manifold can be disassembled by grasping the exposed part of the seal case and inserting and removing the seal case into the manifold. The seal member inside the seal case can be replaced without having to do anything. Therefore, there is no need to handle heavy manifolds, improving the efficiency of replacement and inspection work, and improving work safety.

Furthermore, large-scale tools and the like are not required, and the space that must be secured for replacing the seal member is no longer necessary, and restrictions on the installation of the plunger pump can be reduced.

[Brief explanation of drawings]

1 and 2 show the structure of a plunger pump according to an embodiment of the present invention, FIG. 1 is a detailed sectional view of the main parts of the plunger pump, and FIG. 2 is a sectional view of the entire plunger pump including the driving part. FIG. 3 is a sectional view of a conventional plunger pump. 60... Plunger, 66... Manifold, 82
...Seal case, 86...Pump chamber, 102...
- High pressure seal (seal member), 106...low pressure seal (seal member). 60---------Plunger 6 Low---------Manhold 82---------Seal case 86------Pump chamber 102-----1 High pressure seal (Seal Part) 106
------Low pressure seal (seal member) Figure 3? t) ld

Claims (4)

[Claims] (1) The seal case receives the plunger and has a pump chamber therein, and the seal case is removably attached to the manifold on the tip side of the plunger, and the seal member on which the plunger slides is attached to the manifold. A plunger pump characterized by being removably fitted into the inner circumference of a seal case. (2) The sealing member includes a high-pressure seal that is prevented from coming off by a seal retainer inserted from the insertion-side end of the seal case, and a low-pressure seal that is disposed on the opposite side of the pump chamber from the high-pressure seal. A plunger pump according to claim 1, characterized in that: (3) An annular passage communicating with the pump chamber is formed in the side of the seal case, and the pump chamber communicates with the suction valve and discharge valve of the manifold via this annular passage. A plunger pump according to claim 1 or 2. (4) Claims 1 to 3, characterized in that the seal case is screwed onto the manifold.
Plunger pump according to any of paragraphs.