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Title:
FLAME PIPE OF A CONDENSING HEAT EXCHANGER
Document Type and Number:
WIPO Patent Application WO/2017/043990
Kind Code:
A1
Abstract:
1. Flame pipe of a condensing heat exchanger features pairs of longitudinal dents (2) shaped coaxially with respect to the axis of the pipe (1), where the dents are trapezoid in longitudinal section, positioned opposite each other, pointing towards the centre of the pipe (1) and forming a section, and the distance between the dents (2) in the section measured inside the pipe (1 ) is 0.5 mm or less, and the adjacent dent sections are positioned at an angle of 90° to one another, where the ratio of the pipe length (L) to the inner diameter (S) of the pipe (1) measured in the cylindrical part devoid of dents falls within the range from 26 to 29.

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Inventors:
SZCZEPAŃSKI, Krzysztof (ul. Wigury 119, 83-110 Tczew, PL)
DŁUGOWSKI, Dariusz (ul. Gen. Orlicz-Dreszera 14A m.3, 81-261 Gdynia, PL)
Application Number:
PL2016/000095
Publication Date:
March 16, 2017
Filing Date:
September 07, 2016
Export Citation:
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Assignee:
AIC SPOŁKA AKCYJNA (ul. Rdestowa 41, 81-577 Gdynia, PL)
International Classes:
F28F1/42; F24H1/36; F24H9/00; F28F1/02; F28F1/06; F28F13/08
Foreign References:
US20080029243A12008-02-07
US20140196872A12014-07-17
EP1734326A22006-12-20
US1922838A1933-08-15
Attorney, Agent or Firm:
POMIANEK, Grażyna (Kancelaria Patentowo-Prawna Grażyna Pomianek, ul.Subisława 23 C LOK.7, 80-354 Gdańsk, PL)
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Claims:
Claims

1. A flame pipe of a condensing heat exchanger, characterised in that it features pairs of longitudinal dents (2) shaped coaxially with respect to the axis of the pipe (1), where the dents are trapezoid in longitudinal section, positioned opposite each other, pointing towards the centre of the pipe (1) and forming a section, and the distance between the dents (2) in the section measured inside the pipe (1) is 0.5 mm or less, and the adjacent dent sections are positioned at an angle of 90° to one another, where the ratio of the pipe length (L) to the inner diameter (S) of the pipe (1) measured in the cylindrical part devoid of dents falls within the range from 26 to 29.

2. The pipe according to Claim 1 , characterised in that the ratio of the length (A) of the dent (2) to the inner diameter (S) of the pipe (1) measured in the cylindrical section devoid of dents ranges from 2.5 to 3.

3. The pipe according to Claims 1 or 2, characterised in that the ratio of the depth (H) of the dent (2) to its length (A) ranges from 0.1 to 0.2.

4. The pipe according to Claims 1, 2, or 3, characterised in that there are additional dents (3) pointing towards the centre of the pipe (1) formed in the bottom of dent (2).

5. The pipe according to Claim 1, characterised in that the sections of the dents (2) are arranged at even distances along the length (L) of the pipe (1).

6. The pipe according to Claim 1 , characterised in that the sections of dents (2) are arranged at non-even distances along the length (L) of the pipe (1).

7. The pipe according to Claims 1, 5, or 6, characterised in that the sections of the dents (2) are of different lengths (A).

8. The pipe according to Claims I , 5, or 6, characterised in that the sections of dents (2) are of the same lengths (A).

Description:
Flame pipe of a condensing heat exchanger

The invention concerns a flame pipe of condensing heat exchangers designated for central heating and utility water installations.

Known are heat exchanger pipes fitted with devices to turbulise the combustion gases flowing inside the pipes, which intensify the heat exchange process.

Known from published European patent application EP2384837 is a heat exchanger pipe of other-than-circular shape in cross-section, rectangular in particular, made of a pipe circular in cross-section and having undulated surface with the undulation spreading both sideways and lengthways and the amplitude of the undulation ranging from 0.2 to 1.2 of the outer diameter of the pipe circular in cross-section.

Known from the published European patent application EP 1429085 is a pipe the shape of which in cross section changes along its length and with a flat section in the centre.

The purpose of the invention is to develop a flame pipe for a fired condensing heat exchanger which would intensify the heat exchange process while reducing the flow resistance of the combustion gas and retaining the condensing nature of the processes which occur in the exchanger.

The purpose was achieved by developing a new geometry of the flame pipe.

A flame pipe of a condensing heat exchanger according to the invention is characterised in that it features pairs of longitudinal dents shaped coaxially with respect to the pipe axis, where the dents are trapezoid in longitudinal section, positioned opposite each other, pointing towards the centre of the pipe and forming a section, and the distance between the dents in the section measured inside the pipe is 0.5 mm or less, and the adjacent dent sections are positioned at an angle of 90° to one another, where the ratio of the pipe length to the inner pipe diameter measured in the cylindrical part devoid of dents falls within the range from 26 to 29.

Preferably, the ratio of the dent length to the inner diameter of the pipe measured in the cylindrical part devoid of dents ranges from 2.5 to 3, and the ratio of the dent depth to its length ranges from 0.1 to 0.2.

In addition, there are additional dents pointing towards the centre of the pipe formed in the bottom of the dents.

The dent sections are arranged at either equal or non-equal distances along the pipe length.

The pipe sections are of either the same or different lengths.

The designed proportions between the pipe dimensions and the shape and arrangement of the dents according to the invention ensures retaining the condensing nature of the processes which occur in the exchanger while reducing the flow resistance of the combustion gases inside the pipes and increasing the flow turbulences.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

In the drawings:

Fig. l and Fig. 2 show the pipe in the isometric projection;

Fig.3 and Fig.4 show the pipe as in Fig. 1 in side view;

Fig.5 depicts the pipe as in Fig. 1 in bird's eye view;

Fig.6 and Fig.7 illustrate the pipe as in Fig. 1 in axial section. naprzeciw siebie, skierowanych do srodka rury 1, tworzacych sekcj^.

W dnie nagniotu 2 dodatkowo wykonane s¾ nagnioty 3 rowniez skierowane do srodka rury 1. Odleglosc pomi¾dzy nagniotami 2 w sekcji wewnatrz rury 1 wynosi co najwyzej 0,3 mm a s¾siadujace ze sob¾ sekcje nagniotow usytuowane s¾ wzgl¾dem siebie pod katem 90°. Stosunek diugosci L rury 1 do jej srednicy wewnefrznej S mierzonej w cz^sci walcowej bez nagniotow wynosi od 27 a stosunek diugosci A nagmotu 2 do sredmcy wewnetrznej S rury 1 mierzonej w cze . sci walcowej bez nagniotow wynosi od 2,8 oraz stosunek glebokosci H nagniotu 2 do jego diugosci A wynosi od 0,15.

W innym przykladzie wykonania wynalazku nagnioty 2 mog¾ bye rozmieszczone nierownomiernie.

W innych innych przykladach wykonania wynalazku stosunek diugosci rury L do jej srednicy wewnetrznej S mierzonej w cze_sci walcowej bez nagniotow miesci sie_ w przedziale od 26 do 29, stosunek diugosci nagniotu do srednicy wewnetrznej rury mierzonej w cze ei walcowej bez nagniotow miesci sie . w przedziale od 2,5 do 3 a stosunek glebokosci nagniotu do jego dlugosc miesci si¾ w przedziale od 0,1 do 0,2.

W opisanych wyzej przykladach wykonania wynalazku nagnioty 2 mog%miec te_ sam¾ dlugosc lub rozna_ dlugosc.

Stwierdzono, ze dla temperatury gazu spalinowego od 1450 do 1550 °C, na wejsciu do rury plomiennej i przeptywie 7,0 - 8,0 kg h gazu spalinowego w rurze (dla gazu ziemnego, C0 2 = 9%) oraz dla temperatury poczatkowej 26 °C i dT=55K ogrzewanej cieczy przy przeciwpradowym przeplywie 80-90 1/h przypadajacym na rur^, w odleglosci 850 - 1050 mm od wlotu rury gaz spalinowy osi¾ga punl t rosy, a spadek cisnienia nie jest wi^kszy niz 750Pa. 9%), and the initial temperature of 26 °C and dT=55K of the heated liquid in counterflow of 80-90 1/h per pipe, the combustion gas reaches the dew point at the distance of 850 - 1050 mm from the pipe inlet, and the pressure drop does not exceed 750Pa.




 
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