CN203811016U

CN203811016U - Sealing plug

Info

Publication number: CN203811016U
Application number: CN201420183219.5U
Authority: CN
Inventors: 董晨
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-16
Filing date: 2014-04-16
Publication date: 2014-09-03
Anticipated expiration: 2024-04-16

Abstract

The utility model relates to a sealing plug. The plug has the advantages of being good in sealing effect and free of being shut down in the construction process and not influencing the performance of a heat exchanger. According to the technical scheme, the sealing plug comprises a conical plug body in interference fit with a pipe opening of a heat exchange pipe, the sealing plug is characterized in that a through hole which extends axially and penetrates through the upper end face and the lower end face is formed in the plug; an annular flange which protrudes outwards in the circumference face direction and covers a sealing welding seam of the heat exchange pipe is arranged at the top of the plug, the clearance between the annular flange and a composite pipe plate is sealed through an angle welding seam, or the clearance between the annular flange and the composite pipe plate is sealed through a sealing gasket arranged on the lower portion of the flange.

Description

Seal plug

Technical field

The utility model relates to a kind of plug, specifically a kind of seal plug of repairing heat exchanger tube seal weld defect.

Background technology

Adopt in the large heat exchangers (as condenser) such as clad tubesheet titanium pipe, two phase stainless steel shell and tube, due to the tube wall thinner (thickness is between 0.5～1.0mm) of heat exchanger tube 10, in the time that defect appears in the seal-weld 12 of the heat exchanger tube mouth of pipe (seepage appears in the point of attachment of the heat exchanger tube mouth of pipe and clad tubesheet 11), reparation difficulty is larger; Conventionally the mode of taking at present full compressor emergency shutdown to change heat exchanger tube or half compressor emergency shutdown sealing heat exchanger tube solves this problem.

But, change the difficulty of construction of heat exchanger tube higher, the replacing time is also longer, therefore can produce greater loss when full compressor emergency shutdown.

In the maintenance mode of half compressor emergency shutdown, need to use tapered solid plug (material is identical with heat exchanger tube) as shown in Figure 2 seal the two ends of heat exchanger tube, and stitch 14(as shown in Figure 4 by repair welding) point of attachment of the covering heat exchanger tube mouth of pipe and clad tubesheet; But such maintenance mode easily forms new defect at position while welding, therefore the two ends that must seal heat exchanger tube could thoroughly deal with problems (also will so operate when seal weld defect appears in one end of heat exchanger tube), not only the engineering time is longer, and sealing after heat exchanger tube can not work on, thereby reduce the heat exchange area of heat exchanger, directly affected the performance of heat exchanger; In addition, in the time there is relatively large leakage, can not adopt such maintenance mode.

Utility model content

The purpose of this utility model is the deficiency overcoming in above-mentioned background technology, and a kind of seal plug is provided, and this plug should have good sealing effect, when construction without shutting down and not affecting the feature of heat exchanger performance.

The technical solution of the utility model is: seal plug, comprise one with the taper plug of heat exchange tube interruption-forming interference fit, it is characterized in that: on described plug, be shaped with the through hole that extends axially and connect upper and lower end face; The top of plug is shaped with one and gives prominence to and cover the collar flange of heat exchanger tube seal-weld toward outer circumference surface direction, also by the gap between angle welding closed circular flange and clad tubesheet, or by being arranged on the gap between seal washer closed circular flange and the clad tubesheet under flange.

On the outer circumference surface of described plug bottom, be shaped with an annular recess, separately have a sealing ring to be positioned in groove; To strengthen the sealing property between heat exchanger tube inwall and plug outer circumference surface.

The height of described flange is greater than the thickness of heat exchanger tube tube wall.

Described seal washer and sealing ring are that the rubber of water-swellable is made.

The beneficial effects of the utility model are:

1, while adopting angle welding reparation sealing, can repair by automatic welder(welding machine), form of construction work is comparatively convenient, advanced person guarantees that weld seam is precisely reliable, so seal weld is effective;

And while adopting seal washer reparation sealing, without Site Welding, can obtain equally reliable sealing effectiveness.

2, without shutting down operation, tube sheet removing surface workload reduces, and can reduce maintenance cost;

3, the heat exchanger tube after reparation also can normally be worked, and the performance impact of heat exchanger is less;

Brief description of the drawings

Fig. 1 is the main TV structure schematic diagram of plug described in the utility model.

Fig. 2 is the main TV structure schematic diagram of existing tapered solid plug.

Fig. 3 is the main TV structure schematic diagram of one of the utility model embodiment.

Fig. 4 is two the main TV structure schematic diagram of the utility model embodiment.

Fig. 5 is the mounting structure schematic diagram of existing tapered solid plug.

Detailed description of the invention

Below in conjunction with Figure of description, the utility model is described in further detail, but the utility model is not limited to following examples.

As shown in Figure 1, seal weld plug, comprises that a taper plug 1(also can be described as truncated cone-shaped); Conventionally use drift that this plug is pushed in the heat exchanger tube mouth of pipe that expanded joint crosses, make plug and mouth of pipe position formation interference fit.

Improvements of the present utility model are:

The top of described plug is shaped with a collar flange 1-1, and this flange is outstanding toward outer circumference surface direction, is highly greater than the thickness of heat exchanger tube tube wall; Gap between flange and clad tubesheet end face, can adopt sealing in two ways.

The first is by welding (shown in Fig. 3); Because flange is positioned at the outside of heat exchanger tube and covers the seal-weld of heat exchanger tube, thoroughly seal poor weld so form angle welding 13 by welding between flange and clad tubesheet.

The second is by seal washer (shown in Fig. 4); Seal washer 15 is set under flange, is used for envelope to cover the gap covered between collar flange and clad tubesheet and the seal-weld position of heat exchanger tube; The seal washer that expanded rubber is made in the time that equipment moves is met water and is expanded, thereby thoroughly seals poor weld.

In addition, the bottom of described plug is shaped with an annular recess 1-2, and sealing ring 2 is arranged in groove; As shown in Figure 3, this groove is positioned at the inside of heat exchanger tube, and further strengthens the sealing property between heat exchanger tube inwall and plug outer circumference surface by sealing ring, prevents from causing leakage after medium in heat exchanger tube is by defective seal-weld.

On described plug, be shaped with the through hole 1-3 that extends axially and connect upper and lower end face, this through hole can ensure flowing freely of cooling water, maintain the normal work of heat exchanger tube, overcome the shortcoming that in prior art, the heat exchanger tube after sealing cannot carry out heat exchange, and only need exchange one end that defect appears in heat pipe repairs, also overcome and needed the shortcoming at shutoff heat exchanger tube two ends simultaneously, reduced the workload of nearly half.

Claims

1. seal plug, comprise one with the taper plug (1) of heat exchange tube interruption-forming interference fit, it is characterized in that: on described plug, be shaped with the through hole that extends axially and connect upper and lower end face; The top of plug is shaped with one and gives prominence to and cover the collar flange (1-1) of heat exchanger tube seal-weld (12) toward outer circumference surface direction, also by the gap between angle welding (13) closed circular flange and clad tubesheet, or by being arranged on the gap between seal washer (15) closed circular flange and the clad tubesheet under flange.

2. seal plug according to claim 1, is characterized in that: on the outer circumference surface of described plug bottom, be shaped with an annular recess (1-2), separately have a sealing ring (2) to be positioned in groove; To strengthen the sealing property between heat exchanger tube inwall and plug outer circumference surface.

3. seal plug according to claim 2, is characterized in that: the height of described flange is greater than the thickness of heat exchanger tube tube wall.

4. seal plug according to claim 3, is characterized in that: the rubber that described seal washer and sealing ring are water-swellable is made.