JP3433340B2 - Plunger pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger pump capable of easily knowing when to replace an annular high pressure seal or the like of an ultrahigh pressure plunger pump.

[0002]

2. Description of the Related Art In an ultra-high pressure plunger pump, the annular high-pressure seal gradually wears due to sliding contact with the plunger, and when the wear becomes severe, the sealing ability is lost, causing problems such as discharge pressure pulsation.

The actual state of wear of the annular high-pressure seal cannot be known without removing the seal case from the manifold and actually looking at the annular high-pressure seal.

[0004]

In the conventional plunger pump, whether or not it is time to replace the annular high-pressure seal requires that the seal case be removed from the manifold one by one, which is very complicated.

An object of the present invention is to provide a plunger pump which can know the wear state of the seal member without disassembling the plunger insertion member and can easily know when it is time to replace the seal member. is there.

[0006]

The plunger pump (14) of the present invention has the following components (a) to (e). (A) Plunger (48) reciprocating in the plunger insertion member (32, 34) (b) Sliding contact with the peripheral portion of the plunger (48) on the inner peripheral side, the plunger insertion member (32, 34) and the plunger (48) Seal member (58) (c) which is disposed between the seal member (58) and the seal member (58) toward the stopper (54) in the plunger insertion member (32, 34). d) Detection means for detecting the axial thickness of the seal member (58)
(60) (e) Display means (84) arranged outside the plunger insertion member (32, 34) for displaying the detection result of the detection means (60)

The seal member (58) receives a reduction force of the axial thickness due to the pressing of the seal pressing means (64) toward the stopper (54). On the other hand, the seal member (58) is
It gradually wears due to sliding contact with 8), so the axial thickness is reduced according to the amount of wear. The detection means (60) is a seal member
The axial thickness of (58) is detected, and the detection result is displayed on the display means (84) outside the plunger insertion member (32, 34). Therefore, it is possible to know the proper replacement time of the seal member (58) from the display means (84) without disassembling the plunger insertion member (32, 34) and checking the actual wear state of the seal member (58). it can.

Another plunger pump (14) of the present invention has the following elements (a) to (d). (A) Plunger (48) reciprocating in the plunger insertion member (32, 34) (b) Sliding contact with the peripheral portion of the plunger (48) on the inner peripheral side, the plunger insertion member (32, 34) and the plunger (48) ), The seal member (58) is pressed through the seal retainer (60) toward the stopper (54) in the plunger insertion member (32, 34). The seal pressing means (64) (d) is provided with the exposed portion (84) exposed to the outside of the plunger insertion member (32, 34), and the plunger (4) is attached by the seal retainer (60).
8) The driven body that is carried in the axial direction (82)

The seal member (58) receives a reduction force of the axial thickness due to the pressing of the seal pressing means (64) toward the stopper (54). On the other hand, the seal member (58) is
It gradually wears due to sliding contact with 8), so the axial thickness is reduced according to the amount of wear. As a result, seal holder (60)
Moves toward the seal member (58) by the pressing force from the seal pressing means (64) as the wear amount of the seal member (58) progresses. As a result, the driven body (82)
The position of the exposed part (84) is changed by being carried along in the axial direction by (0). Therefore, without disassembling the plunger insertion member (32, 34) and checking the actual wear state of the seal member (58), the plunger insertion member is determined based on the position of the exposed portion (84) of the driven body (82). It is possible to know the proper replacement time of the seal member (58) from the outside of (32, 34).

Another plunger pump (14) of the present invention has the following element (e). (E) Exposed part that exists along the displacement path of exposed part (84)
Information display member (100) showing the information of the seal member (58) when (84) is in that position

The exposed portion (84) of the driven body (82) is a seal member.
It is displaced along the information display member (100) according to the wear amount of the (58). The part of the information display member (100) where the exposed part (84) is located shows the information on the wear state of the seal member (58) corresponding to the position of the exposed part (84). It is possible to know whether or not the member (58) should be replaced. The information display member (100) includes a ruler having a scale, in addition to a transparent cylinder that displays information in a plurality of color gamuts in an embodiment of the invention described later.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 5 is a vertical cross-sectional view of the ultra-high pressure plunger pump device 10 with the high pressure seal wear amount detection function omitted. The ultra-high pressure plunger pump device 10 is equipped with a plurality of ultra-high pressure plunger pumps 14 operated by a common crankshaft 12. The crankshaft 12 extends in the horizontal direction and is rotatably supported by the crankcase 16 at both ends. Piston rod 18 is for each ultra high pressure plunger pump
It is provided corresponding to 14, and the base end side is coupled to the crosshead 20 by screwing. Crosshead 20 is a crankcase
Guided in the axial direction by 16 guides 22, oil seal 24
Is inserted into the tip of the guide 22 to prevent the lubricating oil in the crankcase 16 from leaking from the guide 22. The connecting rod 26 has a large end fitted to a crankpin of the crankshaft 12, and a small end rotatably connected to the crosshead 20 via a crosspin 28. The surrounding case 30 is joined to the crankcase 16 at the base end side so as to project toward the ultra-high pressure plunger pump 14. Enclosure case 30 is a connecting bolt
With upper and lower walls and side walls assembled and assembled by 38,
At least the upper wall is made of a transparent plate so that the inside can be seen from the outside.

FIG. 6 is a detailed view of the range of the tip side of the ultra-high pressure plunger pump 14. Manifold 32 and seal case
The seal case 34 is joined to each other by a plurality of tightening bolts 36 in a positional relationship in which the seal case 34 is located on the crankcase 16 side of the manifold 32, that is, on the base end side. Siege case 30
Indicates detachably the base end portion of the manifold 32 at the tip end side of the side wall portion. The pump chamber 40 is formed in the manifold 32, communicates with the suction port 44 via the suction valve 42 at the lower portion, and discharge port (not shown) via the discharge valve 46 at the upper portion.
Communicate with. The suction port 44 and the discharge port are commonly provided in the manifold 32 for the plurality of ultra-high pressure plunger pumps 14. The plunger 48 has a piston rod 18 at the base end side.
It is connected to the front end portion of FIG. 5 and penetrates the space in the surrounding case 30 and the seal case 34, then is inserted into the manifold 32 and faces the pump chamber 40 at the front end. The high pressure seal fitting insertion hole 50 and the coil spring fitting insertion hole 52 are provided in the seal case 34.
And seal case from the joint surface of the manifold 32
It extends along the plunger 48 toward the 34 and the manifold 32, and the innermost portions are stepped portions 54 and 62, respectively. The spacer 56 and the plurality of annular high pressure seals 58 are
The high-pressure seal fitting hole 50 is inserted in a row along the line 48 in order from the step portion 54, and the plunger 48 slides its peripheral portion onto the inner periphery of the plurality of annular high-pressure seals 58. The compression coil spring 64 is
It penetrates through the plunger 48 on the inner peripheral side and is inserted into the coil spring insertion hole 52. The seal retainer 60 is located across the high pressure seal fitting insertion hole 50 and the coil spring fitting insertion hole 52, and presses the annular high pressure seal 58 toward the step portion 54 by the urging force from the compression coil spring 64. The annular low-pressure seal 66 is press-fitted into the annular groove of the end face of the seal case 34 on the crankcase 16 side, and slidably contacts the peripheral portion of the plunger 48 on the inner peripheral side. The seal lid 68 corresponds to the crankcase 16 of the seal case 34.
The ring-shaped low pressure seal 66 is prevented from coming off from the seal case 34 by being applied to the side end face and fixed by a screw 70. The O-ring 72 is arranged concentrically with respect to the plunger 48 at the joint surface portion between the manifold 32 and the seal case 34, and prevents the liquid from leaking in the radial direction.

FIG. 1 is a structural diagram of a high pressure seal wear amount detecting function. The high-pressure seal fitting insertion hole 50 has a smaller diameter than the coil spring fitting insertion hole 52, and the seal retainer 60 has a flange portion 86 having substantially the same diameter as the coil spring fitting insertion hole 52 in the range of the coil spring fitting insertion hole 52, The tightening margin 80 matches the distance between the flange portion 86 and the end surface of the seal case 34 on the manifold 32 side. FIG. 2 is a perspective view of the needle 82. The needle 82 includes a needle portion 83 and a flange portion 84 on the base end side of the needle portion 83. In FIG. 1, the pore 87 is formed in the seal case 34 at a radial position that is parallel to the plunger 48 and is equal to the peripheral portion of the flange portion 86, and one end of the pore 87 faces the coil spring fitting insertion hole 52. There is. In the needle 82, the needle portion 83 is axially displaceably inserted into the pore 87 from the crankcase 16 side end surface of the seal case 34, and the tip of the needle portion 83 projects into the coil spring fitting insertion hole 52 and the flange portion 84. Is located near the end surface of the seal case 34 on the crankcase 16 side. The plurality of high-pressure seals 88, the spacers 90, and the low-pressure seals 92 are formed from the end face of the seal case 34 on the crankcase 16 side.
The high-pressure seal 88 and the low-pressure seal 92 are slidably in contact with the needle portion 83 on the inner peripheral side.

FIG. 3 is a perspective view of the plug 94. Plug 94
Is an insertion hole that penetrates the needle portion 83 so as to be displaceable in the axial direction.
96, and-shaped locking part at the tip of the driver is inserted-groove
Has 98. In FIG. 1, the plug 94 is screwed into the hole of the seal case 34 in which the high pressure seal 88 and the like are inserted, and prevents the high pressure seal 88 and the like from coming off the seal case 34.

The operation of the high pressure seal wear amount detecting function of FIG. 1 will be described. The flange 82 of the needle 82 is a plug 94
Until it hits the end face of the seal case 34, the flange portion 84 is not exposed from the seal case 34,
The top surface is aligned with the end surface of the seal case 34 on the crankcase 16 side. Further, at the beginning of use of the ultra-high pressure plunger pump device 10, the annular high-pressure seal 58 is scarcely worn, and the total axial thickness of the plurality of annular high-pressure seals 58 is large. Therefore, the tightening margin 80 is sufficiently large, and the tip of the needle portion 83 of the needle 82 is separated from the flange portion 86.

As the use period of the ultra-high pressure plunger pump device 10 elapses, the annular high-pressure seal 58 is worn and the axial thickness of the plurality of annular high-pressure seals 58 is reduced. The flange portion 86 receives the biasing force of the compression coil spring 64 and advances toward the annular high-pressure seal 58 as the axial thickness of the entire plurality of annular high-pressure seals 58 decreases. Decrease. When the tightening margin 80 becomes equal to or less than a predetermined value, the flange portion 86 of the seal retainer 60 contacts the tip of the needle portion 83, moves toward the annular high-pressure seal 58, and moves the needle 82 toward the base end direction of the ultra-high pressure plunger pump device 10. Push to. As a result, the needle 82 exposes the flange portion 84 from the crankcase 16 side end surface of the seal case 34, and the distance between the flange portion 84 and the crankcase 16 side end surface of the seal case 34 is the dimension of the tightening margin 80, that is, It increases with increasing wear of the annular high pressure seal 58, which is observed from outside the enclosure 30. Seal case 34 crankcase 16
When the protruding position of the flange portion 84 from the side end surface reaches a predetermined position, it is determined that it is time to replace the annular high-pressure seal 58, and at this time, the manifold 32 and the seal case 34
And replace the annular high pressure seal 58 with a new one.

FIG. 4 is a structural diagram of a high pressure seal wear amount detecting function to which a transparent cylinder 100 is added. Transparent cylinder 10
0 means that at least the seal case 34 side is opened, and the flange portion 84 is movable in the axial direction on the inside, and the screw 10
It is fixed to the end face of the seal case 34 on the side of the crankcase 16 via 2. The transparent cylindrical body 100 is colored in the circumferential direction in the axial direction in the order from the seal case 34 to a color different from the color gamuts 104, 106, and 108, for example, blue, yellow, and red in order, respectively, the safety area and the exchange area. , Defined as an abnormal area.

In the high pressure seal wear amount detecting function of FIG. 4, as the wear of the annular high pressure seal 58 progresses, the needle 82 is pushed out from the seal case 34 toward the crankcase 16, and the flange portion 84 is transparent cylinder. Color gamut 104, 10 in the body 100
Pass through 6 and 108 in order. Flange 84 is color gamut 104
When it is, it is judged that the annular high-pressure seal 58 does not need to be replaced, and when the flange portion 84 is in the color gamut 106, it is judged that it is time to replace the annular high-pressure seal 58, and the manifold 32 and the seal case 34 are disassembled. , Replace the annular high pressure seal 58 with a new one. Flange part 84 with color gamuts 104, 106, 108
By identifying the position of, it is possible to easily distinguish the unnecessary time and the necessary time for replacement.

[Brief description of drawings]

FIG. 1 is a structural diagram of a high pressure seal wear amount detection function.

FIG. 2 is a perspective view of a needle.

FIG. 3 is a perspective view of a plug.

FIG. 4 is a structural diagram of a high pressure seal wear amount detection function to which a transparent cylinder is added.

FIG. 5 is a vertical cross-sectional view of the ultra-high pressure plunger pump device in which the high pressure seal wear amount detecting function is omitted.

FIG. 6 is a detailed view of a tip side range of the ultra high pressure plunger pump.

[Explanation of symbols]

14 Ultra-high pressure plunger pump (plunger pump) 32 manifold (plunger insertion member) 34 Seal case (plunger insertion member) 48 Plunger 54 steps (stopper) 58 Annular high-pressure seal (seal member) 60 Seal holder (detection means) 64 Compression coil spring (seal pressing means) 82 Needle (subject) 84 Flange part (exposed part display means) 100 Transparent cylinder (information display member)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F04B 21/00 F04B 21/04 F04B 21/08 F04C 15/00 F15B 20/00

Claims (3)

(57) [Claims] 1. A plunger (48) reciprocating in a plunger insertion member (32, 34), and (b) an inner peripheral side of the plunger insertion member slidingly contacting a peripheral portion of the plunger (48). 32, 34) and the seal member (58) disposed between the plunger (48) and (c) the seal member (58) is provided with a stopper (54) in the plunger insertion member (32, 34). Seal pressing means (64) for pressing the seal member toward (8), (d) the seal member (58)
Detecting means (60) for detecting the axial thickness of the, and (e) display means (84) arranged outside the plunger insertion member (32, 34) for displaying the detection result of the detecting means (60). Plunger pump characterized by having. 2. A plunger (48) reciprocating in the plunger insertion member (32, 34), and (b) an inner peripheral side of the plunger insertion member (32) while slidingly contacting the peripheral portion of the plunger (48). (32, 34) and the plunger (48), a seal member (58), (c) a seal retainer (60) is used to insert the seal member (58) into the plunger insertion member (32, 34). 34)
Seal pressing means (64) for pressing toward the inner stopper (54),
And (d) a driven body (8) which has an exposed portion (84) exposed to the outside of the plunger insertion member (32, 34) and is entrained in the axial direction of the plunger (48) by the seal retainer (60).
2), Plunger pump characterized by having. 3. (e) An information display that is present along the displacement path of the exposed portion (84) and represents the information of the seal member (58) when the exposed portion (84) is at that position. Material (10
3. The plunger pump according to claim 2, further comprising: 0).