JP2005140214A - Shaft seal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft seal structure capable of surely supplying a lubricant to a plunger and a packing. <P>SOLUTION: On a contact face between a stuffing box and a lantern ring, a hole for a lubricant is formed of a through hole having substantially the same diameter and is set in a shape that does not have an annular groove connected to the through hole. The stuffing box case, the stuffing box, and a gland are fastened together by the same fixing means such as a fixing bolt. Each of the holes for the lubricant constituting an injection line of the lubricant and a discharge line is arranged on the same axis and fixed. The lantern ring is provided with a positioning means for positioning and holding a hole for the lubricant of the lantern ring so that it is aligned on the same axis of the injection line and the discharging line. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shaft seal structure that can reliably supply a lubricant to a plunger and a packing.

In the conventional shaft seal structure, as shown in FIGS. 3 and 4, along the holes for lubricant provided in the members of the stuffing box case 22, the stuffing box 23, and the lantern ring 24, Grooves were formed on the outer periphery.
That is, the inner peripheral groove G1 and the outer peripheral groove G2 are formed in the lantern ring 24.
The stuffing box case 22 and the stuffing box 23 are each formed with an outer peripheral groove G2.
The grooves G1 and G2 allow the holes 22A, 23A, and 24A for injecting the lubricant radially disposed in the members 22, 23, and 24 to communicate with the holes 22B, 23B, and 24B for discharging. Widely formed to connect, the lubricant is sent to the inside.
This is because the lubricant hole cannot be positioned at the time of assembly, and the lubricant hole can be communicated regardless of the direction in which each member is assembled.

However, in the above configuration, when cement milk or packing residue accumulates in the innermost groove G1, the lubricant does not reach the surface of the plunger 27 and is discharged around the outer peripheral groove G2.
Therefore, (1) The plunger and the packing cannot be lubricated, (2) Since the cement milk and debris accumulated in the innermost groove is not discharged, it solidifies and promotes the consumption of the plunger and the packing. (3) There is a possibility that heat will be generated by not being lubricated and the packing will be deteriorated.
In addition, since the gland 26 is tightened and the lip of the V packing 25 is opened and sealed, the lantern ring 24 rotates in the circumferential direction, and accurate positioning cannot be performed.
Further, since the V packing 25 is assembled by tightening the gland 26, it is difficult to assemble the V packing 25 with an appropriate dimension, and there is a possibility that the packing life may be shortened due to excessive tightening or conversely insufficient tightening. It was.
Further, when the gland 26 is tightened too much, the lip of the V packing 25 opens more than necessary, which causes heat generation and overload.
JP 2003-222245 A

  The problem to be solved by the present invention is that a shaft for which the outer peripheral groove is unnecessary can be obtained by positioning the hole for the lubricant of each member by fixing the stuffing box case, the stuffing box and the gland at once with the fixing bolt It is to provide a sealing structure.

In order to solve the above-mentioned problems, the present invention provides
A stuffing box fitted in a stuffing box case, a plunger penetrating the stuffing box, a packing and a lantern ring filled and sealed in a gap between the stuffing box and the plunger, and the lantern ring The stuffing box case, the stuffing box, and the lantern ring are formed with a lubricant hole that serves as a lubricant injection line and a discharge line communicating with the shaft seal gap. In the sealed shaft structure,
At least on the contact surface between the stuffing box and the lantern ring, the hole for the lubricant is formed of a through hole having substantially the same diameter, and is set to a shape having no annular groove connected to the through hole,
The stuffing box case, the stuffing box, and the gland are fastened together with fixing means such as the same fixing bolt, and the respective holes for the lubricant constituting the lubricant injection line and the discharge line are coaxially arranged. Fixed in a state of being placed on the line
A technical means is provided in which positioning means is provided for positioning and restraining the lantern ring so that the lubricant hole of the lantern ring is aligned with the injection line and the discharge line.
In the invention of claim 2,
A technology in which a hole for a lubricant is formed as a through-hole on a contact surface between the stuffing box case and the stuffing box, and the shape is not provided with an annular groove connected to the through-hole. Take appropriate measures.
Furthermore, in the invention of claim 3,
The technical means is that the positioning means comprises a positioning pin which can adjust the position of the lantern ring by inserting the lantern ring into a hole provided in the ground.
In the invention of claim 4,
A technical measure is taken that the packing is made of MV packing.
Furthermore, in the invention of claim 5,
Technical means that the positioning means of the lantern ring comprises a stuffing box case, a stuffing box, a lantern ring, and a fixing means for fastening the ground together with fixing means such as the same fixing bolt. I'm taking it.

According to the present invention, the through hole is arranged on the coaxial line as a hole for injecting and discharging the lubricant, and a groove continuous with the through hole is not formed in the through hole.
(1) Lubrication can be performed smoothly and reliably, and the life of the packing and plunger is extended.
(2) The supply material such as cement milk accumulated in the packing can be reliably discharged.
(3) Since the lubrication of the packing is not hindered, heat generation is suppressed.
(4) When using MV packing, tightening with a gland is not required, so that the packing part can be assembled with an appropriate dimension, extending the life of the packing and suppressing heat generation and overload.
(5) Similarly, when the MV packing is used, positioning of the lantern ring is facilitated.

  Lubricant through-holes formed in each member can be arranged on the coaxial line as an injection line and discharge line, and each member is positioned by tightening together with fixing bolts, so the lubricant is reliably supplied to the plunger and packing -Realized to discharge.

A preferred embodiment when the shaft seal structure of the present invention is applied to the plunger pump shown in FIG. 2 will be described below with reference to the drawings.
A shaft seal structure 1 shown in FIG. 1 has a stuffing box 3 fitted to a stuffing box case 2 in a crankcase 10, and a plunger 7 is slidably fitted into the stuffing box 3. It is inserted.
A lantern ring 4 and a packing 5 are filled and sealed in a gap between the stuffing box 3 and the plunger 7, and the lantern ring 4 is held by a gland 6.

The crankcase 10, the stuffing box case 2, the stuffing box 3, and the lantern ring 4 are respectively provided with a pair of lubricant holes serving as a lubricant inlet and outlet in the radial direction. ing.
That is, in the case of the illustrated example, the crankcase 10 is formed with a first inlet 10A and a first outlet 10B that serve as a lubricant inlet and outlet.
Similarly, the stuffing box case 2 is formed with a second inlet 2A and a second outlet 2B, which serve as lubricant inlets and outlets.
In the illustrated example, the first inlet 10A and the first outlet 10B, and the second inlet 2A and the second outlet 2B are set to have substantially the same diameter.

Next, the stuffing box 3 is formed with a third inlet 3 </ b> A and a third outlet 3 </ b> B serving as a lubricant inlet and outlet.
The lantern ring 4 is formed with a fourth inlet 4A and a fourth outlet 4B that serve as lubricant inlets and outlets.
In the illustrated example, the fourth inlet 4A and the fourth outlet 4B have inner circumferential grooves G1 'formed on one side, but the inner circumferential grooves extend on both the left and right sides as in the prior art. Alternatively, a structure without an inner circumferential groove may be used.
In the illustrated example, the third inlet 3A and the third outlet 3B, and the fourth inlet 4A and the fourth outlet 4B are set to have substantially the same diameter.
Further, in the illustrated example, the stuffing box 3 has a proximal end that rises outward to form a bowl shape and abuts with the proximal end of the stuffing box case 2, and the distal end side has the packing 5 at the distal end side of the sealing surface. It is bent vertically so as to close, and is bent so as to be in contact with the plunger 7.

  The first inlet 10A, the second inlet 2A, the third inlet 3A, and the fourth inlet 4A constitute one continuous lubricant injection line L1, and the first outlet 10A, 2nd discharge port 2A, 3rd discharge port 3A, 4th discharge port 4A comprise the discharge line L2 of one continuous lubricant, and it seals between the stuffing box 3 and the plunger 7. A lubricant is injected into and discharged from the shaft seal portion.

Here, in the present embodiment, the first inlet 10A and the first outlet 10B of the crankcase 10 and the second inlet 2A and the second outlet 2B of the stuffing box case 2 pass through substantially the same diameter. It consists of a hole, and it is set in the shape which does not have the annular groove connected to this through-hole in the surface which both contact | connect.
Similarly, the third inlet 3A and the third outlet 3B of the stuffing box 3 and the fourth inlet 4A and the fourth outlet 4B of the lantern ring 4 are the first and second inlets 10A and 2A. The first and second discharge ports 10B and 2B are formed with through-holes having substantially the same diameter, and the surface where both are in contact does not have an annular groove connected to the through-hole. Is set.

The stuffing box case 2, the stuffing box 3 and the gland 6 are respectively formed with bolt holes so that they can be fastened together with the same fixing bolt 8 at a predetermined position. It is formed to be aligned.
Accordingly, the stuffing box case 2, the stuffing box 3, and the gland 6 are fixed in a predetermined posture by tightening the fixing bolt 8, and the second inlet 2A and the second exhaust port of the stuffing box case 2 are fixed. The outlet 2B and the third inlet 3A and the third outlet 3B of the stuffing box 3 are positioned on the coaxial line.
Here, the ground 6 is formed of a donut-shaped plate, and its wide surface abuts on the base end of the stuffing box 3.

  The gland 6 has a hole 6a that opens toward the shaft seal. The position of the lantern ring 4 is adjusted by inserting a positioning pin 9 into the hole 6a and attaching a bush as appropriate. The fourth inlet 4A and the fourth outlet 4B of the lantern ring 4 are fixed on the same line as the third inlet 3A and the third outlet 3B of the stuffing box 3.

Thereby, the first inlet 10A of the crankcase 10, the second inlet 2A of the stuffing box case 2, the third inlet 3A of the stuffing box 3, and the fourth inlet 4A of the lantern ring 4 are connected. A series of injection lines that are aligned on the coaxial line and do not have an outer peripheral groove are formed.
Similarly, the first outlet 10B of the crankcase 10, the second outlet 2B of the stuffing box case 2, the third outlet 3B of the stuffing box 3, and the fourth outlet 4B of the lantern ring 4 are connected. A series of discharge lines that are aligned on the coaxial line and have no outer peripheral groove are formed.

Since it has the above configuration, the through holes constituting the lubricant injection line and the discharge line are aligned on the same axis to form a series of flow paths, and an outer circumferential groove or an inner circumferential groove connected to the through hole. Therefore, there is no possibility that the material to be solidified with time such as cement milk or the residue of the packing will be accumulated in the inner groove, and there is no possibility of solidifying without being discharged.
The lantern ring can be accurately positioned by adjusting with the positioning pin.

The packing 5 may be a V-packing as in the prior art, but in the present embodiment, it is preferable to use an MV packing.
If the MV packing is used, it is not necessary to tighten the gland, so that it is not necessary to open and seal the lip like the V packing, and the lantern rig can be positioned easily.

Next, FIG.1 (c) shows the different Example which used the positioning means of the lantern ring 4 as the fixing means.
In this embodiment, the positioning pin 9 and the hole 6a of the gland 6 are not provided, and the lantern ring 4 is positioned by the fixing bolt 8.
That is, the lantern ring 4 is provided with a flange 40 at an end, and the flange 40 is formed so as to be sandwiched between the ground 6 and the stuffing box 3.
Further, a bolt hole (not shown) is formed in the collar portion 40 of the lantern ring 4, and the bolt hole formed in the stuffing box case 2, the stuffing box 3, and the ground 6 is coaxial with the bolt hole. It is arranged to align with.

As a result, by tightening the fixing bolt 8, the stuffing box case 2, the stuffing box 3, the flange 40 of the lantern ring 4 and the gland 6 are fixed in a predetermined posture, and the first note of the lantern ring 4 is fixed. The inlet 2A (and the second outlet 2B), the second inlet 2A (and the second outlet 2B) of the stuffing box case 2, and the third inlet 3A (and the third outlet 3B) of the stuffing box 3 ) And the fourth inlet 4A (and the fourth outlet 4B) of the lantern ring 4 are positioned on the coaxial line.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

  The present invention is a shaft seal structure that can reliably supply and discharge the lubricant to the plunger and the packing, and can extend the life of the plunger and the packing, so that it can be applied to a plunger pump for supplying various materials. Can do.

It is a figure which shows the Example of the shaft seal structure of this invention, (a) is sectional drawing. It is a figure which shows the Example of the shaft seal structure of this invention, (b) is the perspective view which fractured | ruptured the principal part of (a). It is a figure which shows the Example of the shaft seal structure of this invention, (c) is a fragmentary sectional view which shows a different Example. It is a figure which shows the plunger pump which incorporated the coaxial sealing structure, (a) is a top view, (b) is a side view. It is sectional drawing of the conventional shaft seal structure. It is the perspective view which fractured | ruptured partially in order to show the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft seal structure 2 Stuffing box case 2A 2nd injection port 2B 2nd discharge port 3 Staffing box 3A 3rd injection port 3B 3rd discharge port 4 Lantern ring 4A 4th injection port 4B 4th discharge port 5 Packing 6 Gland 6a hole 7 plunger 8 fixing bolt 9 positioning pin 10 crankcase 10A first inlet 10B first outlet

Claims (5)

A stuffing box fitted in a stuffing box case, a plunger penetrating the stuffing box, a packing and a lantern ring filled and sealed in a gap between the stuffing box and the plunger, and the lantern ring The stuffing box case, the stuffing box, and the lantern ring are formed with a lubricant hole that serves as a lubricant injection line and a discharge line communicating with the shaft seal gap. In the sealed shaft structure,
At least on the contact surface between the stuffing box and the lantern ring, the hole for the lubricant is formed of a through hole having substantially the same diameter, and is set to a shape having no annular groove connected to the through hole,
The stuffing box case, the stuffing box, and the gland are fastened together with fixing means such as the same fixing bolt, and the respective holes for the lubricant constituting the lubricant injection line and the discharge line are coaxially arranged. Fixed in a state of being placed on the line,
A shaft seal structure comprising positioning means for positioning and restraining a lantern ring so that a lubricant hole of the lantern ring is aligned with the injection line and the discharge line.   The contact surface between the stuffing box case and the stuffing box is characterized in that the hole for the lubricant is made of a through hole and is set to a shape having no annular groove connected to the through hole. The shaft seal structure according to claim 1.   The shaft seal structure according to claim 1 or 2, wherein the positioning means comprises a positioning pin that can adjust the position of the lantern ring by inserting the lantern ring into a hole provided in the ground.   The shaft seal structure according to any one of claims 1 to 3, wherein the packing is made of MV packing.   The positioning means of the lantern ring comprises a fixing means for fastening the stuffing box case, the stuffing box, the lantern ring, and the gland together with fixing means such as the same fixing bolt. The shaft seal structure according to any one of 1 to 4.

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