JPS59117959A - Mechanical seal for water pump - Google Patents

Abstract

PURPOSE:To reduce the noise of a mechanical seal for a water pump by forming the string-shaped grooves having a specific shape onto the slidable contact surface of the mechanical seal. CONSTITUTION:The inside part of each string-shaped groove 12 formed on the slidable surface of a seat ring 5 for a mechanical seal 3 is closed in the intermediate part in the radial direction of the slidable surface, and the outside part is extended frontward from the closure part in the direction of revolution of the seat ring 5 and opened and allowed to communicate to the outer peripheral side. Since the string-shaped groove 12 is inclined frontward in the direction of revolution of the seat ring 5 and opened and allowed to communicate to the outer peripheral side, water is introduced into the string-shaped groove 12 by the revolution of the seat ring 5, and the water filling the string-shaped groove 12 cools the slidable surface, and the lubrication condition is improved, and the noise is reduced. The string-shaped groove 12 suppresses the generation and growth of adhesion state and prevents the generation of abnormal noise. Said string-shaped groove 12 may be formed on a trailing ring 4 or on the both rings 4 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical seal for a water pump.

Mechanical seals for water pumps, which are generally installed in engine cooling systems, have the seat ring and driven ring in contact with each other, and the sliding surface prevents water on the outer circumference from leaking into the atmosphere on the inner circumference. are doing. In mechanical seals for water pumps, the lubricating fluid on the sliding surfaces is water, so it is not possible to use oil as lubricant like Mechanino J Lucille for car cooler compressors. The sliding conditions of the above sliding surface are poor for the mechanical seal that uses W fluid,
l[1,B was generated because it is easy to generate stellar kink. In the past, this noise was not very noticeable as it was relatively small compared to the noise from other engines, etc., but as the noise from engines etc. has been reduced, the surrounding noise has become especially small. It has started to melt at low engine speeds.

In view of these circumstances, the present invention provides a mechanical seal for a water pump that can reduce noise a.

The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, (1) is a water pump casing, (2
) is a rotating shaft that is inserted into the cylindrical part 11a) of this casing fl) and rotatably supported by a bearing provided in the cylindrical part [1a], and the rotating shaft (2) is The left end portion is linked to an engine as a 1-drive engine via a pulley (not shown) and /\ru1~.

-1・1. A mechanical seal (3) is provided at the 41 end of the upper cylindrical shape 71!1Ja), and this mechanical seal (3) is connected to a driven ring (4) that can be displaced in the axial direction of the rotation axis (2). It includes a sealing ring (5) that rotates together with the rotating shaft (2) but is fixed in the axial direction. The driven ring (4) is fitted to the outer circumference of the tip of the inner surface portion (6a) constituting a part of the support portion side (6) so as to be able to reciprocate along its axial direction. (
By engaging the axial protrusion (6b) provided on the outer periphery of the inner cylindrical R1+ (6a) with the +Il+ force direction rR [4a) provided on the inner periphery iH4 of 4), the I try not to. The above-mentioned support portion (6) has an inner cylindrical shape ffl! (6a) no 1☆:! 11 E: Wall extending radially outward from II, this 't1'rr
It has an outer cylindrical part [11] which is folded back to the right from the outer periphery of the lI (6c), and a flange part (6e) which is bent radially outward from this outer surface part (6d). By fitting the cylindrical part (6d) into the cylindrical protrusion a) of the casing 11) through the seal assembly (7), the sealing performance of that part is maintained and the driven ring (4
) on the support part side (6), which is t+'J )jL with respect to the rotational direction! One end of the seal assembly (8) is glued to the right end surface of the I section (6c), and the other end of the seal assembly (8) is driven with the middle part curved. By adhering to the left end surface of the ring (4), the sealing property between the support part side (6) and the seat ring (4) is maintained. There is a spring (9) between both ends of this seal assembly (8).
), the driven ring (4) is brought into elastic contact with the seat ring (5). This seat ring (
5) is attached via a floating gasket 11) within the four parts (10a) formed in the rotor (10) for performing a pumping action, which is fixed to the rotating shaft (2). ) so that it rotates as a single body weight. Note that, contrary to the illustrated embodiment, the rotation axis (
2) A driven ring that can be displaced in the axial direction (4 rings to 1
The seat ring (5) may be attached to the casing (1) and fixed thereto, in addition to being provided on the shaft (2) so as to be able to rotate integrally therewith.

Part 1 of 1. In a water pump that performs +I□, when the rotating shaft (2) is turned +l171'24 HIiiJ by the engine without a comb in Fig. 7J, the rotor (10) integrated with this rotates and pumps water into the engine. Supply to each cooling section. At this time, the water is sealed by the seal parts u (7) and (8), and the water is sealed by the mechanical seal (3) [moving ring (4) and seat ring (5)].
It becomes sealed by the sliding surface.

However, on the sliding surface of the driven ring (5), as shown in FIG.
Yarn grooves (12) are placed at equal intervals on the outer periphery so that J<
is formed. The inside part of each yarn groove (12) is +i as above.
It is closed at the radial middle part of the I+ contact surface, and the other outside ff!
! I,? +4 is the closed J11 bar [ζ to the driven ring (
It extends to a gravity fill of 5 inches in the rotational direction and communicates through the opening to the external station side.

Figure f1 shows the results of the M-sound test for mechanical seals, and Figure f8) in the same figure shows a 1°2 thread thread γ15? for comparison. Figure 1b) shows the experimental results for the mechanical seal according to the present invention described above for a mechanical seal having a flat sliding surface with a neck of 111δ, and Figure 1(C) shows the mechanical seal itself. This shows the noise results when the head is omitted.

In this experiment, the rotary shaft (2) was rotated by a motor [320 rpm] with or without a mechanical seal installed in the casing (1), and when the mechanical seal was installed, it was actually used as a water pump. In the state in which water was being discharged, the supply pressure was measured using a pump set at a distance of about 150 mm, and this was frequency-analyzed. At the same time, the overall noise of each is measured redundantly, and the results are displayed as a mesh bar graph at the right end of each figure.

As can be understood from the experimental results in Figure 3 18) to fc), the sound pressure associated with the mechanical seal is lower in Figure 3 fa), (
b) is shown by the shaded area, and as a result, iIP hini upper g[j
From the noise results, it is determined that no substantial noise is generated in the apparatus of the present invention.

In this example, noise can be prevented only by the system groove (12
) is tilted forward in the direction of rotation of the driven ring (5) and communicates with the outer peripheral side of the driven ring (5), so water is drawn into the thread groove (12) by the rotation of the driven ring (5). ,
If the conventional device i4 without the thread groove (12) is
Has the f condition changed? - This is thought to be due to the fact that

Also, the water that fills the thread groove (12) is removed! IJJ 1f
It is thought that the noise is reduced by cooling the fi, which also improves the water supply conditions. In this embodiment, the inner part of the thread 11''; fe2) is closed, so even if the thread rirI'i (12) is filled with water, the thread': : An unreasonably large amount of water does not leak, unlike when Ni is formed in equal amounts on the inner circumference and on the outer circumference, and it can be put to practical use.

In addition, each of the threads 11'+7 [12] acts not only on the water existing between the sliding surfaces, but also on the 1i'V 41 plane of the driven link (4), which is the mating member. do. That is, the driven link (4) and the seat ring (5)
Jun1・V) Xz (Since i is jjM, Ha1B
1jsIJP't is generated by the sliding contact of the ring, stacking the stickings and producing abnormal noise, but the dihedral thread groove (12) suppresses the occurrence or growth of adhesion and prevents abnormal noise.
This is thought to prevent the occurrence of Also, Keijo Mizoji 2)
It stores foreign matter and abrasion powder, and prevents roughness and increase in dynamic resistance caused by foreign matter and abrasion powder intervening between the +1'7 and +1'7 joints, and also prevents adhesion from occurring due to 1ni roughness. This also functions to prevent abnormal noise from occurring.

The depth, width, number, etc. of the thread groove (12) can be determined as appropriate depending on the conditions of use, etc., and the direction of the forming force of the thread groove (12) can be determined according to these set values. can be taken as approximately the radial force direction. Furthermore, in the above embodiment, the thread groove (12)
is provided on the seat ring (5), but the driven link (4)
Alternatively, it may be provided on both rings [4), 15). When the driven ring (4) is provided with the groove (12) at an angle, the direction of relative rotation of the driven ring to the seat ring may be used as a reference, and the inclination is in the opposite direction to that of the seat ring.

As described above, according to the present invention, it is possible to reduce the noise of the mechanical seal for a water pump.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The front view of the seat ring shown in FIG. 3 and FIGS. 3 fa) to +C) are diagrams showing the results of measuring sound pressure and noise, respectively. (1)...Casing (2)...Rotating shaft (3)...
Mechanino J Lucille (4)... Driven ring (5) Sealing 1-ring (I2)... Thread groove Fig. 1

Claims (1)

[Claims] It is equipped with a seat link and a driven link that is in sliding contact with the seat ring, and the distance between the seal link and the driven ring is
M J7j quotient, the water on the outer circumference side is 1i
In a mechanical seal for a water pump that prevents the rings from pulling, the sliding contact surface has an inner part open and an outer part radially or relative rotation of both rings 1=force direction 1ii
A mechanical seal for a water pump, characterized in that a system groove is formed that extends toward the power side and communicates with the opening on the outer circumferential side.