CN207379058U - A kind of U-shaped flue tube boiler - Google Patents

Abstract

A kind of U-shaped flue tube boiler, including furnace body, it is arranged on the in vivo flue of stove and smoke pipe, swivel chamber is connected with after flue, smoke pipe is connected in swivel chamber, the smoke pipe is U-shaped, and the rear end of U-shaped smoke pipe is connected in swivel chamber, and the front end of U-shaped smoke pipe is hanging, flue gas enters after swivel chamber completes the second backhaul into U-shaped smoke pipe flow forward, and the 3rd backhaul is completed to rear flowing after the front end bending of U-shaped smoke pipe.This boiler allows the length of smoke pipe to shorten, and can effectively reduce the entire length of boiler；The length of swivel chamber can shorten to 100mm；Workload can be effectively reduced, the workload of inspection of the boiler can also be reduced by reducing weld seam quantity.

Description

A kind of U-shaped flue tube boiler

Technical field

The utility model is related to boiler, more particularly to a kind of U-shaped flue tube boiler belongs to technical field of heat exchange equipment.

Background technology

Three-pass boiler is widely used for a kind of heat transmission equipment of industry and civil field, the traditional structure of this equipment It is that tube sheet is respectively welded before and after flue, smoke pipe is connected on front and rear tube sheet, setting front smoke box and rear smoke box, preceding before and after flue Smoke box and rear smoke box are also swivel chamber, the smoke box after burner hearth enters of the flue gas after burning, by smoke pipe to preceding cigarette from rear smoke box Chamber completes the heat exchange of the second backhaul, then continues the heat exchange of the 3rd backhaul of flowing completion backward by smoke pipe from front smoke box, at present This commonly used traditional boiler structure has following defect：When the necessary long enough of boiler, because smoke pipe and flue two End is fixedly welded on tube sheet, smoke pipe length direction upper smoke tube to flue Constrained stress, when heated, flame passes through Smoke pipe area is gone to after flue；Flue and smoke pipe all expanded by heating, but flue expansion is more, and smoke pipe expansion is few, so when heated Smoke pipe can form the constraint to flue both ends, in order to reduce destruction of this influence to boiler, it is necessary to make smoke pipe long enough ability Reducing influences, and this structure is limited the length lower limit of boiler；And the Edge Distance flue of smoke pipe must have certain distance；Second is that Smoke box after flue gas of this boiler in heat exchange in tube bank arrives first, then enters back into tube bank, in order to make from rear smoke box to tube bank Energy loss reduces, and rear smoke box generally wants long enough, and generally in 500mm or so, this is also limited the length lower limiting value of boiler, from Front smoke box is pooled to again after tube bank out, then is re-assigned to next backhaul tube bank, and changes of section is had during flowing, Variable cross-section causes vortex area and speed to redistribute, and generating the fluctuation velocity vertical with flowing to causes resistance to increase, so this In the process with larger drag losses；Third, this product is time-consuming when making, the boiler of this three backhaul is being made It needs to weld smoke pipe after first front and rear smoke box is welded on tube sheet again when making, smoke box cannot be carried out at the same time with smoke pipe welding, in work Must be the context of series connection in sequence, and welding job amount is big, if vacuum boiler, also results in and workload is examined to add Greatly.

The content of the invention

The purpose of the utility model is to overcome the above problems present in current three-pass boiler, provide a kind of U-shaped Flue tube boiler.

To realize the purpose of this utility model, following technical solutions is employed：A kind of U-shaped flue tube boiler, including furnace body, The in vivo flue of stove and smoke pipe are arranged on, swivel chamber is connected with after flue, smoke pipe, the smoke pipe are connected in swivel chamber For U-shaped, the rear end of U-shaped smoke pipe is connected in swivel chamber, and the front end of U-shaped smoke pipe is hanging, and flue gas enters U-shaped cigarette after entering swivel chamber Pipe flow forward completes the second backhaul, and the 3rd backhaul is completed to rear flowing after the front end bending of U-shaped smoke pipe；Further；It is described U-shaped smoke pipe in complete the smoke pipe of the second backhaul using thread heat exchange pipe, the smoke pipe for completing the 3rd backhaul uses assistant pipe；Into one Step；The length of the swivel chamber is less than or equal to 300mm；Further；The length of the swivel chamber is 100mm- 150mm。

The positive advantageous effects of the utility model are：This boiler uses U-shaped smoke pipe, and smoke pipe does not have flue both ends Restraining force can be mutually independent of each other both in heating process with independently-inflatable in the case where expansion rate is inconsistent, this causes cigarette The length of pipe can shorten, and can effectively reduce the entire length of boiler；Second is that this design can make the length of swivel chamber It shortens, the length through testing swivel chamber can shorten to 100mm；Third, this boiler on the make swivel chamber and smoke pipe and tube sheet Between welding can synchronously carry out, and weld seam is few when making, and can effectively reduce workload, reducing weld seam quantity can also Reduce the workload of inspection of the boiler.

Description of the drawings

Fig. 1 is the schematic diagram of the utility model.

Fig. 2 is the schematic diagram of U-shaped smoke pipe.

Specific embodiment

In order to more fully explain the implementation of the utility model, the embodiment of the utility model is provided.These implement real Example is only the elaboration to the utility model, does not limit the scope of the utility model.

With reference to attached drawing to the further details of explanation of the utility model, in attached drawing respectively mark for：1：Flue；2：U-shaped smoke pipe； 3：Swivel chamber；4：Complete the smoke pipe of the second backhaul；5：Complete the smoke pipe of the 3rd backhaul.As shown in drawings, a kind of U-shaped smoke pipe pot Stove including furnace body, is arranged on the in vivo flue 1 of stove and smoke pipe, swivel chamber 3 is connected with after flue 1, is connected in swivel chamber 3 There is smoke pipe, the smoke pipe is U-shaped, and 2 be U-shaped smoke pipe, and the rear end of U-shaped smoke pipe 2 is connected in swivel chamber 3, before U-shaped smoke pipe 2 End is hanging, and flue gas enters after swivel chamber completes the second backhaul into 2 flow forward of U-shaped smoke pipe, after the front end bending of U-shaped smoke pipe to The 3rd backhaul is completed in flowing afterwards；The smoke pipe of the second backhaul is completed in the U-shaped smoke pipe using thread heat exchange pipe, is completed the 3rd time The smoke pipe of journey uses assistant pipe；4 show the smoke pipe for completing the second backhaul in figure；5 show the smoke pipe for completing the 3rd backhaul, institute The length for the swivel chamber stated is less than or equal to 300mm；In more detail, the length of the swivel chamber is 100mm-150mm.Screw thread Heat exchanger tube is a kind of common heat exchanger tube, on the structure of assistant pipe, sees the Application No. 2015108773642 that applicant applies Patent application document.

After the embodiment of the utility model is described in detail, one of ordinary skilled in the art is clearly understood that, Above-mentioned claim is not departed from various change and modification can be carried out under spirit, it is all according to the technical essence of the utility model To any simple modification, equivalent change and modification that above example is made, the scope of technical solutions of the utility model is belonged to, And the utility model is also not only restricted to the embodiment of example in specification.

Claims (4)

1. a kind of U-shaped flue tube boiler including furnace body, is arranged on the in vivo flue of stove and smoke pipe, it is characterised in that：After flue Swivel chamber is connected with, smoke pipe is connected in swivel chamber, the smoke pipe is U-shaped, and the rear end of U-shaped smoke pipe is connected in swivel chamber, U The front end of shape smoke pipe is hanging, and flue gas enters after swivel chamber completes the second backhaul into U-shaped smoke pipe flow forward, before U-shaped smoke pipe After the bending of end the 3rd backhaul is completed to rear flowing.

2. a kind of U-shaped flue tube boiler according to claim 1, it is characterised in that：It is completed second time in the U-shaped smoke pipe The smoke pipe of journey uses thread heat exchange pipe, and the smoke pipe for completing the 3rd backhaul uses assistant pipe.

3. a kind of U-shaped flue tube boiler according to claim 1, it is characterised in that：The length of the swivel chamber be less than etc. In 300mm.

4. a kind of U-shaped flue tube boiler according to claim 1, it is characterised in that：The length of the swivel chamber is 100mm-150mm。