JPS604799A - Basket-retainer for heat-exchanger tube cleaning element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to shuttle cleaning of heat exchangers and
U.S. Patent No. 3,3 granted to Heeren et al.
No. 19,710 and Lei on November 7, 1978.
This invention relates to an improvement on the concept disclosed in U.S. Pat. No. 4,124,065 to Tner et al.

As is known from the above-mentioned US patents, cages or baskets containing individual elongated cleaning elements are connected to the ends of a longitudinally extending tube disposed within the heat exchanger housing. The tube end is laterally held in place by a sheet in the tube. The basket is adapted to house a shuttle-actuated cleaning element, such as a brush. Fluid flowing unidirectionally through the tubes keeps the cleaning elements contained within their respective basket chambers and drains them out through slot-like openings in the basket walls. When the fluid flow is reversed, the cleaning element will move its corresponding busken!・It is pushed out through the tube and moves to the basket at the opposite end of the tube to clean the tube.

A number of methods have been proposed for bringing tubes in apertures in a tube sheet into fluid flow communication with a basket. One method is to press fit the inner end of the basket into the opening or into the tube end itself.

No. 350.288, filed Feb. 18, 1982, of the same applicant, discloses that the inner end of the basket is provided with a collar which defines a flared lip at the end of the tube that projects from the outer surface of the tube jar sheet. Another arrangement is disclosed that hangs from the top.

In some cases, the basket mounting arrangement described above may not be desirable. For example, when used in high temperature heat exchangers,
Press fitting alone cannot maintain the bonded state due to the large temperature fluctuations that the bonded portion experiences. Additionally, certain heat exchanger specifications may require that the tube-sheet openings not be threaded, that the tube ends not be flared, or that other structures be compatible with conventional mounting points. Sometimes.

The aim of the invention is not to rely solely on the above-mentioned joining method, yet to hold the basket securely. The object of the present invention is to provide attachment means for a cleaning element storage basket.

According to various features of the invention, the basket retaining plate is adjacent to the outer surface of the tube sheet, and in one embodiment the basket retaining plate is adjacent to the outer surface of the tube sheet.
It is fixed with bolts or the like while being spaced outward from the outer surface of the seat. The retaining plate and the mounting portion cooperate with the tube sheet to maintain the basket in a constant position relative to the tube sheet and the tube end regardless of temperature changes. The outer receiving and holding part of the basket projects outwardly from the holding plate. Paskent has a retaining plate with a central or intermediate part that passes through the irises opening, a retaining plate, a tube,
an inner portion extending through the space between the sheets and terminating within the tube sheet opening.

The basket is fixed by two-point support, that is, the inner end of the basket and the middle part thereof, so as not to be displaced laterally. In order to hold the basket in a constant longitudinal position, in an embodiment consisting of:

The middle part of the basket is screwed into the retaining plate. In another embodiment, a shoulder adjacent the inner end of the basket engages the retainer plate and tube sheet. The retainer plate has a smaller diameter than the tube sheet, and the passket and basket receiver provide an unobstructed fluid flow opening between the openings.

The present invention will be described below with reference to the accompanying drawings.

The present invention is directed to a tube-type heat exchanger. Such a heat exchanger and its fluid flow control system is shown schematically in FIG. Heat exchanger l has end-closed head 3
．． 4 and a plurality of tubes 5 extending longitudinally within the housing. The exposed open end of the tube 5 is a circular horizontal tube Φ sheet 6
．． 7, these tube e-sheets are also separated by their respective end heads 3.4. The head 3 and the tube sheet 6 constitute one fluid chamber 8, and a partition wall 9 divides the space between the head 4 and the tube sheet 7 into a pair of fluid chambers 10, 11. Heat exchange fluid is introduced around tube 5 through inlet 12 and exits at outlet 1
Discharge from 3.

Heat exchanger l is also connected in the usual manner to a fluid source 14, a pump 15 and a fluid diverter valve 16 through various conduits. The fluid passes through one tube 5 depending on the position of the valve 16,
It flows through chambers 10.8.11 or in the opposite direction.

The heat exchanger 1 includes tube cleaning means. For this purpose, the end of each tube 5 is connected to a receiving device. The containment device includes, in this embodiment, a basket 17 with a longitudinally extending elongated pad, the basket being concentric with the tube and made of metal or other suitable material. The basket has a slot at 18. The inner diameters of tube 5 and basket 17 are approximately the same. A pair of narrow tabs 19 are provided at the outer end of each pad (17) which are folded in to form an abutment and joined together by a weld 20 or the like.

Each basket forms a housing chamber 21 for holding a tube cleaning device 22, and this tube cleaning device M2
When the fluid flow is reversed by the valve 16, the valves 2 perform a shuttle action, that is, a reciprocating motion, back and forth between the baskets and the respective ends within the corresponding tubes 5. Device 22 may be of any type, but is shown as having a coiled spring 23 moving along a central rod 24.

In this example, each tube 5 is shown as having an enlarged end 26 that enters an aperture 25 in the tube sheet 6 and tightly fits the outer end of the aperture.

According to various features of the invention, as shown in FIGS. 2 and 3, a roughly circular lateral retaining plate 27 is provided adjacent to the tube sheet 6, in this embodiment within the chamber 8. 6
They are spaced apart from each other in a substantially parallel manner to the outside. Means are provided for securing the retaining plate 27 to the tube sheet 6. For this purpose, in one embodiment, a plurality of circumferentially spaced bolts 28 pass through the retaining plate 27 and are screwed into the tube seat 6. A nut 29 is attached to the threaded outer end of the bolt. This locks the retaining plate 27 in place on the bolt. The longitudinal spacing between the retaining plate 27 and the tube seat 6 can be varied by adjusting the bolts.

Retainer plate 27 cooperates with tube sheet 6 to hold each basket in position relative to tube sheet 6 and the ends of tubes 5. As shown, basket 17
has a generally cylindrical wall 30 whose outer part for retaining the cleaning element has a slot 18, and a retaining plate 27 also projects outwardly. An external thread 31 is provided which threadably engages an internal thread 32 provided in an opening 33 of the retaining plate 27. The passget inner wall portion extends inwardly from the retaining plate 27 towards the tube seat 6 and・It ends in the seat opening 25. This inner wall portion is tightly attached as shown at 34. In this embodiment, the inner end of the /\sket y is slightly attached to the tube enlarged portion 26. It goes in there and is a press fit.

The basket 17 is fixed by two-point support, that is, the inner end is supported by the tube sheet and the tube 5, and the middle part is supported by the retaining plate 27 so that it cannot be displaced laterally.
ing.

The basket 17 is prevented from being displaced in the longitudinal direction by bolts 28 connecting the tube sheet 6 and the retaining plate, and by the fact that the basket 27 is threadedly engaged with the retaining plate 27 (Fig. 3). is also fixed.

FIG. 4 shows another form of means for preventing longitudinal displacement of Basquera I. In this form, the basket 17
The opening 33a of the holding plate 27 is not screwed together, and the basket simply passes through this opening in a slidable manner. Instead, an annular spacer 35 is provided at the inner end of the wall 30, which is larger than the aperture 25.33 and which allows the corresponding tube to open when the bolt 28 is tightened.
Separate inner and outer shoulders 36, 37 are formed which engage the seat 6 and the retaining plate 27.

Of course, the retaining plate 27 is provided with a plurality of apertures 33.33a arranged in axial alignment with the apertures 25 in the tube sheet 6.

During operation of the heat exchanger 1, the tube housing sheet 6 and the retaining plate 27
It is desirable to create an adequate lateral flow of fluid within the chamber 8 between the two and to prevent undesirable substances from accumulating in this area. For this purpose, as shown in FIG. 2, the diameter of the retaining plate 27 is smaller than the diameter of the housing wall 2 and the tube sheet 6, with an annular channel extending around the edge of the retaining plate. The outer surface of 27 and the retaining plate 27. tube·
The space between the sheets 6 is communicated with each other. Additionally, the retainer plate 27 is provided with a plurality of unobstructed fluid openings 38 between the basket 17 and the basket receiver opening 33 to improve communication with the underside of the retainer plate. In addition,
It should be understood that such a structure may be avoided and the retaining plate 27 may be directly engaged with the tube sheet 6 to form a form without a space such as the chamber 8, as is clear from the foregoing description.

Although an example in which the features of the present invention are applied to the tube seat 6 is shown in the drawings, it should be understood that the same structure can generally be used for the tube seat 7 as well.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a heat exchanger and its fluid flow rate control device, and Fig. 2 is a fragmentary perspective view of a part of the heat exchanger. Figure 3 shows the tube sheet and retaining plate.
FIG. 3 is a vertical cross-sectional view showing one embodiment of a socket attachment part. FIG. 4 is a longitudinal sectional view showing another embodiment of the basket attachment part. l...0 heat exchanger, 2/l111 housing, 5/11
-Tube, 6.7... Sheet inside the tube. 9... Partition wall, 14... Fluid source, 15... Pump, 16Φ・Fluid diversion valve, 17.9 basket, 18
・Fistφ slot, 1911・Fist tab, 22...Tube cleaning device, 24...Central rod, 27@shaφ retaining plate Agent Akira Kono, patent attorney Procedural amendment (method) 1. Indication of matter A'1 1982 Patent Application No. 110749 2 Name of the invention Basket retainer 3 of the 1st centimeter of heat exchanger tube cleaning element, Person making the amendment Relationship with matter A'1 Patent applicant Name: Walter Jay Baron (and one other person) 4. Agent: 107 Address: 2-2-21-6 Akasaka, Minato-ku, Tokyo Drawings subject to amendment

Claims (1)

Claims: (1) a housing, a plurality of longitudinally extending fluid flow tubes disposed within the housing; and a plurality of longitudinally extending fluid flow tubes disposed within the housing! in combination in a heat exchanger having a tube sheet having an opening in communication with an end of said tube, and further comprising a longitudinally extending basket for receiving a shuttle-acting tube cleaning element, (a5 of said tube sheet; a retaining plate fixed adjacent to an outer surface; (b) means for mounting the basket in a fixed relationship with respect to the tube fist seat and one end of the tube, including the retaining plate; (2) , in the combination described in claim 1,
A combination characterized in that the basket attachment means includes means for securing the basket against lateral shuttle action. (3) The combination of claim 2, wherein: (a) the basket extends at least between the retaining plate and the tube sheet and connects with the tube sheet opening and the nesting hole; has. (b) the retaining plate includes an opening for receiving the basket; (c) A combination characterized in that the fixing means includes a two-point cage support means that utilizes the cage connection portion and the holding plate opening. (4) The combination according to claim 1, wherein the basket mounting means includes means for fixing the basket at a fixed position in one longitudinal direction. (5) The combination of claim 4, wherein: (a) the basket has at least a portion extending between the retainer plate and the tube sheet opening. (b) the retaining plate includes an opening for receiving the basket; and (c) the securing means includes a threaded connection between the retaining plate opening and the basket. (6) In the combination according to claim 1, (a) the basket has at least a portion extending between the retaining plate and the tube or seat opening. (b) the retaining plate includes an opening for receiving the basket; and (C) the securing means includes a spaced shoulder disposed in the basket portion and engaging the tube◆sheet and the retaining plate. A combination characterized by: (7) The combination according to claim 6, wherein the shoulder portion is provided at the inner end of the basket, or at the annular spacer. (8) The combination according to any one of claims 1.2.4, characterized in that the basket has a tube cleaning element holder arranged on the outside in the longitudinal direction of the holding plate. A combination of (9) The combination according to claim 1, wherein the retaining plate is spaced apart from the tube sheet. (10) The combination according to claim 9, characterized in that the combination includes means for fluidly communicating the outer surface of the retaining plate with the space between the retaining plate and the tube 1 sheet. . (11) The combination according to claim 10, wherein the diameter of the holding plate is smaller than that of the tube sheet to form an annular fluid flow path constituting the fluid communication means. Match. (12) In the combination according to claim 10 or 11, (a) a plurality of basket holders disposed within the retaining plate have an opening; (b) a plurality of basket holders disposed within the retaining plate; and a plurality of unobstructed fluid flow openings disposed between the openings and forming said fluid communication means.