JPH0245700A - Pump device - Google Patents

Abstract

PURPOSE:To enable a device to be applicable even for a case, when working fluid is necessary for preventing impurities from mixing of demineralized water or the like, by enabling the working fluid, in which a worn dust from a mechanical seal is mixed, to be discharged to the outside of a casing passing through a discharge port. CONSTITUTION:A pump device is provided with a casing 11 having a fluid passage, impeller 1, rotary shaft 16 and a mechanical seal 31. The device provides a discharge port 51 appearing in the periphery of the rotary shaft 16 in a side of the impeller from the mechanical seal 31 and discharging working fluid in the vicinity of the mechanical seal 31 to the outside of the casing 11.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a pump device, and in particular, to a pump device. II relates to a structure suitable for cases where the fluid needs to be protected from impurities such as pure water.

(Prior Art) As a pump device, for example, a regenerative pump has a casing having an annular fluid passage communicating with a suction port and a discharge port, and blades formed on the outer periphery of the casing are fitted into the fluid passage of the casing, and the blades are rotated. The blade rotatably moves in the fluid passage, the rotating shaft is rotatably supported by the casing and has the impeller integrally attached thereto, and the outer periphery of the rotating shaft is fitted onto the outer periphery of the rotating shaft and extends from the fluid passage to the outer periphery of the rotating shaft. It is equipped with a mechanical seal that prevents leakage of f11 fluid transmitted to the air conditioner.

When the rotary shaft is driven by a motor or the like to rotate the blade In, the working fluid in the blade of the impeller flows out from the outer periphery of the blade and flows into the blade from the fluid passage through the side part of the blade. The working fluid receives pressure energy and velocity energy due to the centrifugal force of the rotation inside, and the velocity energy is converted to pressure energy within the fluid passage, and this action is repeated within the blades of the impeller to increase the fluid pressure. , is discharged through the discharge port.

(Problem to be Solved by the Invention) By the way, a regenerative pump has a structure in which the impeller rotates without contacting the casing, and the rotating shaft to which the impeller is attached passes through the gap between the impeller and the casing. Since the working fluid is transmitted to the rotating shaft, a mechanical seal installed on this rotating shaft prevents the working fluid from leaking.

However, mechanical seals have a mechanical sliding surface in contact with the PI fluid, and wear always occurs on this mechanical surface, and this wear causes I! ! The milling powder mixes into the working fluid, and the working fluid mixed with the abrasion powder reaches the fluid passage and is discharged. Therefore, Saku vJi
If there is a need to prevent contamination of the body with impurities such as pure water, conventional regenerative pumps cannot do this.

The present invention has been developed in view of the above-mentioned problems, and is capable of removing working fluid mixed with abrasion particles generated from mechanical seals, and is also useful when it is necessary to prevent contamination of impurities such as pure water. The purpose of this invention is to provide a pump device that can handle this.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a casing 11 having a fluid passage 20, an impeller 1 rotatably fitted into the fluid passage 20 of the casing 11, and the casing 11. The rotating shaft 16 is rotatably supported by the rotary shaft 16 and the impeller 1 is integrally attached thereto.
A work that is passed down to the outside! In a pump device equipped with a mechanical seal 31 that seals IJ fluid, the working fluid near the mechanical seal 31 is discharged to the outside of the casing 11 facing the outer periphery of the rotating shaft 16 on the impeller 1 side from the mechanical seal 31. A discharge boat 51 is provided.

(Function) In the present invention, the working fluid containing the abrasion powder from the mechanical seal 31 is discharged to the outside of the casing 11 through the extrusion boat 51.

(Example) Hereinafter, the configuration of an actual tMVA of the present invention will be explained with reference to the drawings.

In the figure, reference numeral 1 denotes an impeller, which is provided with a boss portion 3 having a screw hole 2 opening on the negative side in the center, and blades 4 on one side of the outer periphery. )
A plurality of blade plates 5 are provided in one direction, and blade grooves 6 opening in the outer circumferential direction and one side direction are provided between each of the blade plates 5.

Reference numeral 11 denotes a casing. A support 12 is attached to one side of the casing 11, and a cover 14, which is tightened by bolts (not shown), is tightly attached to the other side via a packing 13. A bearing 15 is attached to the support body 12.
The rotation @ 16 is rotatably supported by the rotation shaft 16 , and one end of this rotation shaft 16 protrudes from the end surface of the support body 12 and is connected to a motor (not shown) and driven to rotate.
The (l!! end) protrudes into the space 17 inside the casing 11, and the screw portion 18 at the tip is screwed into the screw hole 2 of the blade ffi 1 to be connected and fixed.

Also, on the side surface of the casing 11 facing the cover 14, there is a recess in which the wing 1 is rotatably formed. ! I19 is provided, and a fluid passage 20 is provided on the outer periphery of this four part 19. The fluid passage 20 is provided in an annular shape with a substantially circular cross section, and has a suction port 21 and a discharge port 2 as shown in FIG.
2 communicate with each other, and between the suction port 21 and the discharge port 22,
The isolation part 23 that isolates the fluid passage 20 on the suction port 21 side and the fluid passage 20 on the discharge port 22 side has approximately the same external shape as the impeller 1.
It is set in shape.

J3, a fourth portion 24 into which the boss portion 3 of the impeller 1 enters is provided at the portion of the cover 14 that faces the casing 11.

A mechanical seal 31 is attached to the outside of the rotation @ 16 in the casing 11, and this mechanical seal 31 is fitted and fixed to the inner periphery of the stepped portion 25 between the space 17 of the casing 11 and the concave FIS 19, and is fixed to the rotating shaft. 16 is rotatably fitted to the inner periphery of the rotary shaft 16, and a cylindrical rotating member 34 having a parapet 33 that is in close contact with the outer periphery of the rotating shaft 16, these members 32. 34 is each member 32.
The annular fFl provided at 34! 11 members 35, 36 are connected to each other. This fixed side member 32 is tightly fitted to the inner periphery of the stepped portion 25 via a packing 37, and a stop plate 38 is tightened and fixed to the side surface of the stepped portion 25 with a bolt (not shown).
Further, a spring 41 is fitted between the rotation side member 34 and a retaining ring 40 which is fixed to the outer periphery of the rotation shaft 16 by a screw 39 adjacent to the rotation side member 34. The spring 41 urges the stationary member 32 toward the movable member 35 and the movable member 36 .

Further, the fixed side member 32J3 of the mechanical seal 31
The casing 11 is provided with a discharge boat 51 that communicates the circumferential surface of the rotating shaft 16 with the outside of the casing 11, that is, a boat 52 that penetrates the inside and outside of the fixed side member 32 and a boat that penetrates the inside and outside of the casing 11. 53 is provided, and a needle valve 54 and a stop valve 55 are connected to this discharge boat 51.

Then, when the rotary shaft 16 is driven by a motor or the like to rotate the impeller 1, the working fluid, such as pure water, in the blade groove 6 of the blade i11 flows out from the outer periphery of the blade into the fluid passage 20 and the fluid passage 20 flows into the blade 1116 through the blade side, the working fluid receives pressure energy and velocity energy due to the centrifugal force of the rotation of the blade width, and the velocity energy is converted into pressure energy within the fluid passage 20. Such a bamboo field is repeated within the blades 4 of the impeller 1 to increase the fluid pressure, and the fluid is discharged through the discharge port 22.

By the way, this regenerative pump has a structure in which the inner blade 1 rotates without contacting the casing 11 etc.
Since the working fluid is transmitted to the rotating @16 to which the impeller 1 is attached through the gap between the impeller 1 and the casing 11, a mechanical seal 31 provided on the rotating @16 prevents the working fluid from leaking.

This mechanical seal 31 is connected to the rotating side member 34.
can rotate together with the rotating shaft 16, so the opening member 36 of the rotating member 34 slides with respect to the opening member 35 of the stationary member 32.

Therefore, the sliding surfaces of the 171 moving parts 35 and 36 of the mechanical seal 31 are inevitably worn, and abrasion powder generated by this wear is mixed into the working fluid. Here, if the stop valve 55 piped to the discharge boat 51 is opened, the abrasion powder is removed from the discharge boat 5 along with the working fluid flowing around the rotary shaft 1G while rotating with the rotation of the rotary shaft 16.
The working fluid that is discharged to the outside through 1 and mixed with wear particles reaches the fluid passage 20 and is not discharged from the discharge port 22. For example, in the case of pure water where the working fluid must be prevented from being contaminated with impurities. can also be handled.

Note that the opening amount of the needle valve 54 adjusts the IJI discharge of the working fluid discharged through the discharge boat 51, and the closing of the stop valve 55 adjusts the amount of working fluid υ1.
You can stop it from coming out.

Furthermore, although the above embodiments have been described with respect to regenerative pumps, the present invention can also be applied to mechanical seals of pumps with other configurations.

〔Effect of the invention〕

According to the present invention, the working fluid mixed with wear powder from the mechanical seal can be discharged to the outside of the casing through the discharge boat, and can be applied to cases where it is necessary to prevent contamination of impurities such as pure water, for example. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a regenerative pump showing an embodiment of the pump device of the present invention, and FIG. 2 is a side view of the pump with its cover removed. 1... Inside the blade, 11... Casing, 16... Rotating shaft,
20...Fluid passage, 31...Mechanical seal, 51...
・Discharge boat.

Claims (1)

[Claims] (1) A casing having a fluid passage, an impeller that rotatably fits into the fluid passage of the casing, a rotating shaft that is rotatably supported by the casing and has the impeller integrally attached thereto, and this rotating shaft. a mechanical seal that fits on the outer periphery of the rotary shaft and seals the working fluid transmitted from the fluid passage to the outer periphery of the rotating shaft, the mechanical seal facing the outer periphery of the rotating shaft closer to the impeller than the mechanical seal; A pump device comprising a discharge boat for discharging the working fluid to the outside of the casing.