Shell structure of full-premixing main heat exchanger

Abstract

The utility model discloses a shell structure of a full premixing main heat exchanger, which comprises a rear plate, a heat exchange cavity wall arranged on the rear plate and a front cover arranged at the front part of the heat exchange cavity wall, a combustion heat exchange cavity is enclosed by the rear plate, the heat exchange cavity wall and the front cover, a condensate water outlet and two coil pipe mounting holes are arranged on the heat exchange cavity wall, a gas inlet is arranged on the front cover, and a gas outlet is arranged on the gas inlet. The smoke exhaust device is characterized in that a smoke exhaust box is arranged on the upper portion of the rear plate, a smoke temporary storage cavity is formed in the smoke exhaust box, the rear portion of the smoke temporary storage cavity is communicated with the combustion heat exchange cavity, a smoke exhaust port is formed in the top wall of the smoke exhaust box, and temperature detector mounting holes are formed in the front side wall or the left side wall or the right side wall of the smoke exhaust box. The shell structure is convenient for the temperature measurement probe, and can greatly reduce the influence of optical radiation and thermal radiation on the detection precision of the temperature measurement probe during gas combustion.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas heating technical field especially relates to a whole premixing main heat exchanger's casing structure. BACKGROUND

[0002] The main heat exchanger of traditional gas heating hot water furnace includes combustion chamber, installs the heat exchanger in the combustion chamber, and the bottom of heat exchanger has multiple rows of combustor, air and gas enter the combustion chamber respectively, and mix combustion in the combustion chamber, and the heat utilization rate of this water heater is not high, causes the waste of energy.

[0003] In order to solve the above problem, the patent with publication number CN 206420160 U discloses a kind of main heat exchanger of whole premixing gas heating hot water furnace.The device includes rear plate and front cover;Rear plate and front cover constitute closed space, spiral annular coil pipe is installed in rear plate, the two joints of annular coil pipe are downward, annular flue is formed between the outer side wall of annular coil pipe and the inner side wall of rear plate, and rear plate is provided with smoke outlet communicated with annular flue;Front cover is provided with combustor that extends into the ring heart of annular coil pipe, and the side wall of combustor is provided with evenly arranged air outlet hole;Front cover is provided with air inlet and ignition electrode, rear plate and front cover are aluminum castings, annular coil pipe is integrally bent into shape by single metal flat tube, and combustor is metal fiber material, since main heat exchanger is closed, can reduce heat loss, the heat exchange area of annular coil pipe is also large, and the utilization rate of heat is also improved, and heat exchange efficiency is as high as 108.5%-109%, and energy saving is more than 25%.

[0004] However, the above-mentioned main heat exchanger also has the following problems: first, the smoke outlet 5 is directly arranged on the upper portion of the rear plate 1, which is directly affected by the heat radiation in the combustion chamber, and it is difficult to arrange a temperature sensor at this position to accurately measure the temperature of the flue gas;Second, the entire rear plate 1 is an aluminum casting, and the condensate outlet 10 is directly arranged on the lower portion of the rear plate 1, which results in a lower temperature near the condensate outlet 10 of the rear plate 1, and a high temperature at other positions of the rear plate, and the large temperature difference easily causes the rear plate 1 to deform. INVENTION CONTENTS

[0005] Therefore, the purpose of the present utility model is to provide a casing structure of a whole premixing main heat exchanger, which is convenient for installing a temperature measuring device to accurately measure the temperature of the flue gas.

[0006] The technical solution adopted by the present utility model to solve the technical problems is as follows:

[0007] The shell structure of a full-premix primary heat exchanger comprises a back plate, a heat exchange cavity wall arranged on the back plate, and a front cover arranged at the front of the heat exchange cavity wall, the back plate, the heat exchange cavity wall and the front cover form a combustion heat exchange cavity, the heat exchange cavity wall is provided with a condensate water outlet and two coil mounting holes, and the front cover is provided with a gas inlet, characterized in that the upper portion of the back plate is provided with a smoke exhaust box, the smoke exhaust box has a flue gas buffer cavity, the rear portion of the flue gas buffer cavity is communicated with the combustion heat exchange cavity, the top wall of the smoke exhaust box is provided with a smoke exhaust port, and the front side wall, the left side wall or the right side wall of the smoke exhaust box is provided with a temperature detector mounting hole.

[0008] As a further optimization scheme of the above scheme, the front cover is provided with a fire observation hole, and a cover plate is arranged at the fire observation hole.

[0009] As a further optimization scheme of the above scheme, the front cover is provided with an ignition needle.

[0010] As a further optimization scheme of the above scheme, the heat exchange cavity wall comprises a front ring, a rear ring integrally connected with the back plate, and a middle ring clamped between the front ring and the rear ring, the front ring and the rear ring are connected through fasteners to fix the middle ring, the lower portion of the front ring and the lower portion of the rear ring are each provided with a coil mounting hole, and the condensate water outlet is arranged at the lower portion of the middle ring.

[0011] As a further optimization scheme of the above scheme, the fastener comprises a bolt and a nut.

[0012] As a further optimization scheme of the above scheme, the front cover is connected with the front ring through a screw.

[0013] As a further optimization scheme of the above scheme, the smoke exhaust box is integrally connected at the upper portion of the back plate, and a channel for communicating the flue gas buffer cavity with the combustion heat exchange cavity is arranged between the smoke exhaust box and the rear ring.

[0014] As a further optimization scheme of the above scheme, the front end and the rear end of the inner side wall of the middle ring are each provided with a protruding water baffle.

[0015] The beneficial effect of the utility model is: when the primary heat exchanger working with the shell structure is installed with a temperature measuring probe in the flue gas buffer cavity through the temperature detector mounting hole, the temperature of the flue gas can be detected. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the perspective view of the utility model;

[0017] Fig. 2is a right view of the utility model;

[0018] Fig. 3 is an exploded view of the utility model;

[0019] Fig. 4 is a front view of the utility model. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described clearly and completely below with reference to the drawings.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly. In addition, the description of "preferred", "second preferred", etc. in the utility model is only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of indicated technical features. Therefore, the features with "preferred" and "second preferred" can explicitly or implicitly include at least one of the features.

[0022] Referring to Figs. 1 to 4 The utility model provides a kind of shell structure of full premix main heat exchanger, including rear plate 1, heat exchange cavity wall 2 being arranged on rear plate 1, and front cover 3 being installed in the front of heat exchange cavity wall 2, rear plate 1, heat exchange cavity wall 2 and front cover 3 are enclosed combustion heat exchange cavity, heat exchange cavity wall 2 is provided with condensate outlet 201 and two coil mounting holes 202, front cover 3 is provided with gas inlet 301, the upper portion of rear plate 1 is provided with smoke discharging box 4, smoke discharging box 4 has flue gas buffer cavity 400 in it, the rear portion of flue gas buffer cavity 400 is communicated with combustion heat exchange cavity, smoke discharging box 4 is provided with smoke outlet 41 on the top wall, temperature detector mounting hole 42 is provided on the front side wall, left side wall or right side wall of smoke discharging box 4. Preferably, temperature detector mounting hole 42 is provided on the front side wall of smoke discharging box 4.

[0023] Ignition needle 6 is provided on front cover 3. In the shell structure, burner and coil are installed, i.e. main heat exchanger of full premix gas heating hot water furnace is formed. When this main heat exchanger works, temperature measuring probe that is inserted into flue gas buffer cavity 400 is installed at temperature detector mounting hole 42, i.e. it can be used to detect the temperature of flue gas. And due to the existence of the lower side wall of smoke discharging box 4 and heat exchange cavity wall 2, the heat radiation and light radiation of flame in combustion heat exchange cavity cannot be directly received by temperature measuring probe, so the accuracy of flue gas temperature detection can be improved.

[0024] Furthermore, the front cover 3 is provided with a viewing hole 31, and a cover plate 5 is installed at the viewing hole 31. The cover plate 5 is preferably transparent and is connected to the front cover 3 by screws 8, so as to facilitate direct observation of the combustion of gas.

[0025] Preferably, the heat exchange chamber wall 2 includes a front ring 21, a rear ring 22 integrally connected to the rear plate 1, and a middle ring 23 sandwiched between the front ring 21 and the rear ring 22. The front ring 21 and the rear ring 22 are connected by fasteners to fix the middle ring 23. A coil mounting hole 202 is provided at the lower part of both the front ring 21 and the rear ring 22. A condensate outlet 201 is provided at the lower part of the middle ring 23. Preferably, the fasteners include bolts 7 and nuts. The front cover 3 is connected to the front ring 21 by screws 8. Sealing structures are provided between the front ring 21 and the middle ring 23, and between the rear ring 22 and the middle ring 23. A sealing structure is also provided between the front ring 21 and the front cover 3. These sealing structures are preferably made of silicone rings with good heat resistance. Setting the heat exchange chamber wall 2 as a structure composed of three parts—the front ring 21, the rear ring 22, and the middle ring 23—facilitates manufacturing and molding. When the three parts are at different temperatures, their thermal expansion and contraction have minimal impact on the other two parts, which helps to improve the service life of the product.

[0026] Specifically, the smoke exhaust box 4 is integrally connected to the upper part of the rear plate 1, and a channel is provided between the smoke exhaust box 4 and the rear ring 22 to connect the flue gas buffer chamber 400 with the combustion heat exchange chamber.

[0027] Furthermore, protruding water-blocking strips 205 are provided at both the front and rear ends of the inner wall of the middle ring 23. The design of the water-blocking strips 205 can prevent condensate on the inner wall of the middle ring 23 from flowing to the front ring 21 and the rear ring 22, thus preventing the front ring 21 and the rear ring 22 from being cooled and shrinking.

[0028] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A shell structure for a fully premixed main heat exchanger, comprising a rear plate, a heat exchange chamber wall disposed on the rear plate, and a front cover installed at the front of the heat exchange chamber wall, wherein the rear plate, the heat exchange chamber wall, and the front cover form a combustion heat exchange chamber, the heat exchange chamber wall is provided with a condensate outlet and two coil mounting holes, and the front cover is provided with a gas inlet, characterized in that, The upper part of the rear plate is provided with a smoke exhaust box, the smoke exhaust box has a flue gas buffer chamber, the rear part of the flue gas buffer chamber is connected to the combustion heat exchange chamber, the top wall of the smoke exhaust box is provided with a smoke exhaust port, and the front side wall, left side wall or right side wall of the smoke exhaust box is provided with a temperature detector mounting hole.

2. The shell structure of a fully premixed main heat exchanger according to claim 1, characterized in that, The front cover is provided with a fire observation hole, and a cover plate is installed at the fire observation hole.

3. The shell structure of a fully premixed main heat exchanger according to claim 1, characterized in that, An ignition needle is provided on the front cover.

4. The shell structure of a fully premixed main heat exchanger according to claim 1, characterized in that, The heat exchange chamber wall includes a front ring, a rear ring integrally connected to the rear plate, and a middle ring sandwiched between the front ring and the rear ring. The front ring and the rear ring are connected by fasteners to fix the middle ring. A coil mounting hole is provided at the lower part of the front ring and the lower part of the rear ring. The condensate outlet is located at the lower part of the middle ring.

5. The shell structure of a fully premixed main heat exchanger according to claim 4, characterized in that, The fasteners include bolts and nuts.

6. The shell structure of a fully premixed main heat exchanger according to claim 4, characterized in that, The front cover and the front ring are connected by screws.

7. The shell structure of a fully premixed main heat exchanger according to claim 4, characterized in that, The exhaust box is integrally connected to the upper part of the rear plate, and a channel connecting the flue gas buffer chamber and the combustion heat exchange chamber is provided between the exhaust box and the rear ring.

8. The shell structure of a fully premixed main heat exchanger according to claim 4, characterized in that, Both the front and rear ends of the inner wall of the middle ring are provided with protruding water-blocking strips.

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