JPH06299991A - Lining pump - Google Patents

Abstract

PURPOSE:To improve the durability of a pump by inserting a drain nozzle made of FRP into a hole in the casing which is made for the draining purpose, and providing the integrated coating of a flange where this drain nozzle colliding against the inner wall of the casing by the lining layer to provide a structure where the base material of the casing is not exposed to the liquid. CONSTITUTION:A penetration preventing layer 2a is lined on the whole passage walls in a casing 1 except a drain nozzle 3, and the positioning is made by inserting the drain nozzle 3 which is preliminarily made of FRP from the side of a spiral chamber 1a of the casing 1, and the FRP2b is lined and finished. A ring 3b is fitted to a part projecting from the casing 1, and at the same time, an externally mounted flange 3c is integrated through an adhesive seal layer 3d. The base material of the penetration preventing layer 2a is the thermo- setting resin of normal temperature hardening type where the flake is mixed, and this constitution prevents the corrosion of the base material of the casing by the acid or the like, and the durability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining pump which has a drain nozzle for discharging a residual liquid as well as lining an inner flow path wall of a pump casing.

[0002]

2. Description of the Related Art Pumps used for waste liquid treatment in factories and for pumping fluids in various chemical plants are designed to prevent corrosion of internal flow passages and to be applicable to fluids in low to high temperature ranges. The inner wall of the lining is used. This lining treatment is performed by injecting, for example, a fluororesin or a reinforced fiber plastic (hereinafter referred to as "FRP") melted by a transfer molding method into the pump casing after casting and processing, and cooling it while pressurized. Done.

On the other hand, the bottom of the casing is provided with a drain hole for draining residual liquid. This drain hole is provided for one purpose, for example, to prevent the previously used fluid from being mixed with the newly used fluid when the fluid to be used is changed. Further, in the case of maintenance and inspection or disassembly work, when the fluid used is, for example, an acid liquid, it is dangerous to touch the human body, and therefore it is also used for draining the liquid before the work.

Various lining treatments have been conventionally performed on metal products through which various fluids pass. The basis of the lining process is, as described above, that a synthetic resin is joined by mold making in order to prevent internal corrosion on the metal side. For example, as a lining capable of withstanding a high-concentration acid solution at a high temperature, JP-A-62-1
As described in Japanese Patent No. 52743, there is one having a two-layer lining consisting of a permeation preventive layer and a corrosion resistant layer. The permeation preventive layer is made of a room temperature curable thermosetting resin mixed with flakes, and the corrosion resistant layer is a surface mat, cloth or mat.
It is made of a thermosetting thermosetting phenolic resin compounded with at least one kind.

The combination of the permeation preventive layer and the corrosion resistant layer prevents internal corrosion on the metal side even with respect to a high temperature and high concentration acid solution.

[0006]

However, the inner diameter of the drain hole of the pump casing is relatively small. On the other hand, to form the permeation preventive layer and the corrosion resistant layer on the inner circumference of the drain hole,
There is no choice but to resort to manual application. Therefore, even if an attempt is made to provide a drain hole with a permeation preventive layer and a corrosion resistant layer, a highly reliable lining is not possible due to its small inner diameter.

As described above, although the lining itself has a good measure, it has not been applied to a fine portion such as a drain hole of a pump casing.

The problem to be solved in the present invention is to enable good lining of the entire pump casing including the drain portion and to improve its corrosion resistance.

[0009]

According to the present invention, a lining layer of synthetic resin is formed on the inner peripheral wall of a casing forming an internal flow path from an inlet to an outlet via a spiral chamber, and the spiral chamber is further formed. A lining pump having a drain hole at the lower end of the drain hole, the drain hole is formed in the casing by a reinforced fiber plastic drain nozzle insertable from the volute chamber side, the lining layer is A two-layer structure comprising a permeation-preventing layer of a room temperature curable thermosetting resin mixed with flakes mixed with an inner peripheral wall of the casing and a reinforcing fiber plastic layer bonded and coated on the surface thereof, and the drain nozzle is provided with the lining layer. The joint with the inner wall of the casing is sealed and fixed.

[0010]

The inner wall of the casing has a two-layer coating consisting of a permeation-preventing layer and a reinforced fiber-plastic layer, and the permeation-preventing layer prevents the acid solution from diffusing into the casing fabric even if the reinforced fiber-plastic cracks. . Therefore, as compared with the single-layer lining, the occurrence of internal corrosion of the casing material is suppressed and the durability can be improved.

Further, since the drain nozzle itself is made of reinforced fiber plastic and its base end side is covered and sealed by the lining layer, the hole formed in the casing does not come into direct contact with the fluid by the drain nozzle. Therefore,
Even if the inner periphery of the drain hole is not subjected to the lining treatment, the drain nozzle also serves as an alternative to this, and the lining up to the drain portion is possible.

[0012]

1 is a longitudinal sectional view of a main part of a casing of a lining pump according to the present invention, showing a casing of a centrifugal pump as an example.

In the figure, a casing 1 manufactured by casting and processing forms a vortex chamber 1a into which an impeller (not shown) is incorporated, and is provided with an inlet 1b coaxially with the casing 1a and outlets 1c. The flow path wall is formed. Then, by connecting another cover casing (not shown) to the right end of the casing 1, a closed flow path space is created, and the fluid can be pumped by the rotation of the impeller of the spiral chamber 1a.

The lining layer 2 is integrally joined to the swirl chamber 1a and the outlet 1c including a part of the flange 1d of the inlet 1b. The lining layer 2 is formed by joining a penetration preventing layer 2a similar to that described in the section of the prior art to the inner wall of the casing 1,
Furthermore, the surface of the permeation preventive layer 2a is lined with the FRP layer 2b (see FIG. 2).

The lower end portion of the casing 1, which is the spiral chamber 1a
Open the drain hole 1e at the position facing the
A P-made drain nozzle 3 is incorporated.

FIG. 2 is an enlarged vertical sectional view showing the drain nozzle 3 portion.

The drain nozzle 3 has a flange 3a at one end thereof.
And is inserted into the hole 1e from the inside of the casing 1. The flange 3a abuts the inner wall of the casing 1 with a wide contact area, and is fixed in such a posture that the outer peripheral surface does not contact the inner wall of the hole 1e. Further, the drain nozzle 3 has an axial length such that the tip thereof projects outward from the surface of the casing 1, and the ring 3 surrounds the projecting portion.
b is extrapolated and abutted on the surface of the casing 1. An FRP exterior flange 3c is arranged at the tip of the drain nozzle 3 and is integrally joined to the ring 3b by an adhesive seal layer 3d that fills the gap.

Assembly of the drain nozzle 3 into the casing 1 and formation of the lining layer 2 are carried out in the following order.

First, the casing 1 other than the drain nozzle 3
The permeation preventive layer 2a is lined on the entire inner wall of the channel. Next, a prefabricated drain nozzle 3 made of FRP is inserted into the hole 1e from the side of the spiral chamber 1a of the casing 1 and positioned so that the flange 3a thereof exactly hits the inner wall of the casing 1. Then, the FRP layer 2b is lined and finished. At this time, the flange 3a is surely covered with the FRP layer 2b. Finally, casing 1
The ring 3b is fitted in the portion projecting from the outside and the exterior flange 3c is integrated through the adhesive seal layer 3d.

As a lining method, the composition materials for forming these layers are applied and laminated so as to have an appropriate wall thickness, or for the permeation preventive layer 2a and the FRP layer 2.
It is applicable to prepare the respective inner molds for b and to inject and pressurize the molten composition material by the mold production to cool and solidify.

The permeation preventive layer 2a is made of a room temperature curable thermosetting resin mixed with flakes. As the room temperature curable thermosetting resin, isophthalic acid polyester resin, vinyl ester resin, het acid polyester resin and the like can be applied. The flakes compounded with these synthetic resins are, for example, fish scales, and glass flakes, carbon flakes, graphite flakes, and the like can be used.

The permeation preventive layer 2a is finally made of FRP.
As it is lined and protected by the layer 2b, its chemical degradation by acids is suppressed. And the FRP layer 2
Even if pinholes or cracks occur in b, the acid that diffuses and permeates from these is blocked by the permeation preventive layer 2a. Therefore, the corrosion of the cloth of the casing 1 due to the acid or the like is effectively prevented, and the durability is improved.

As described above, the lining layer 2 is formed in the casing 1, and the drain nozzle 3 has its flange covered with the lining layer 2 and is fixedly held in place. At this time, the drain nozzle 3 is only loosely fitted in the hole 1e, but its flange 3a
Since the portion is sealed and restrained by the lining layer 2, the drain nozzle 3 is stably held with respect to the casing 1.

During normal operation, the drain nozzle 3
A plug (not shown) is fitted to the tip of the drain nozzle 3 and the drain nozzle 3 is opened as shown only when the liquid is drained.

In this way, the inner flow path of the casing 1 is lined by the lining layer 2, and the hole 1e which becomes the drainage drain portion is covered by the drain nozzle 3. For this reason, in the past, the nozzle holes could not be properly lined, whereas the drain nozzle 3 made of FRP serves as a drainage channel and at the same time serves as a lining layer for the fabric of the casing 1. Therefore, even if the inner diameter of the drain hole 1e is small, it can be applied to pumps of various specifications if a drain nozzle 3 that can be adapted to this is manufactured.

Further, the flange 3a of the drain nozzle 3 is
The contact area with the lining layer 2 is made large. For this reason,
At the time of forming the lining layer 2, it becomes possible to stabilize the drain nozzle 3 via the flange 3a and maintain a good seal.

[0027]

In the lining pump of the present invention, the drain nozzle made of FRP is inserted into the hole of the casing opened for the drain, and the flange that abuts the inner wall of the casing is integrally covered with the lining layer. Even if the lining layer cannot be formed in the hole, the drain passage extending from the inside of the casing to the outside can be subjected to the lining treatment. For this reason, even if the drain hole has a small diameter to which the application work or the like cannot be applied, the casing material can be configured not to be exposed to the liquid, and the durability of the pump can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a main part of a lining pump of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of an assembled portion of a drain nozzle.

[Explanation of symbols]

 1 Casing 1a Swirl Chamber 1b Inlet 1c Outlet 1d Flange 1e Hole 2 Lining Layer 2a Permeation Prevention Layer 2b FRP Layer 3 Drain Nozzle 3a Flange 3b Ring 3c Exterior Flange 3d Adhesive Seal Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidehiko Muroe Inventor Hidehiko Muroe 59 Nippon Steel Plant Design Co., Ltd. 46 Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor Katsuaki Nakagawa 46, Nakahara, Tobata-ku, Kitakyushu, Fukuoka Address: 59 Nittetsu Plant Design Co., Ltd. (72) Inventor Yoshiyuki Imanishi 2-24, Narai, Yamaguchi-cho, Nishinomiya-shi, Hyogo Matsuda Pump Mfg. Co., Ltd. (72) Mitsuru Matsubara 3 Shioe, Amagasaki-shi, Hyogo Prefecture Chome 1-17 Fuji Resin Industry Co., Ltd.

Claims (1)

[Claims] 1. A synthetic resin lining layer is formed on an inner peripheral wall of a casing forming an internal flow path from an inlet to an outlet via a spiral chamber, and a drain hole is further provided at a lower end portion of the spiral chamber. A lining pump comprising a drain nozzle made of a reinforced fiber plastic capable of inserting the drain hole into the hole formed in the casing from the spiral chamber side, and the lining layer is bonded to an inner peripheral wall of the casing. A two-layer structure comprising a permeation preventive layer of a room temperature curable thermosetting resin mixed with flakes and a reinforced fiber plastic layer which is jointly coated on the surface thereof. The lining layer is provided between the drain nozzle and the inner wall of the casing. A lining pump that seals the joints.