Kiln waste heat recycling device

Abstract

The invention discloses a kiln waste heat recycling device which comprises a kiln heating section, a kiln cooling section, a circulating fan, a pipeline and a waste heat utilization device. The circulating fan comprises a shell and an impeller, and the impeller comprises a rear cover plate, a front cover plate and blades; the impeller is characterized in that the blade comprises a first blade part and a second blade part, the first blade part and the second blade part take the midpoint of the axis direction of the blade as a boundary line, a first concave notch is formed in the radial outer edge of the first blade part and sinks towards the radial inner side, and a second concave notch is formed in the second blade part and sinks towards the radial outer side; the first blade part comprises a first arc-shaped section, a first straight section and a second arc-shaped section, and the second blade part comprises a third arc-shaped section, a second straight section and a fourth arc-shaped section. According to the invention, the air volume loss can be reduced, the air supply stability is improved, the air supply efficiency is improved, and the noise is reduced, so that the stable and efficient operation of the kiln waste heat recycling device can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, and in particular to a kiln waste heat recovery and reuse device. Background Art

[0002] The existing kiln waste heat recovery and reuse device includes a kiln heating section, a kiln cooling section, a circulating fan, a first pipeline, a second pipeline, and a waste heat utilization device. The kiln heating section is used for heating / drying in the manufacturing process of ceramic tile products. The kiln heating section and the kiln cooling section are connected. The top of the downstream end of the kiln cooling section is connected to the top of the upstream end of the kiln heating through the first pipeline. The first pipeline is connected with a circulating fan and a control valve. The top of the downstream end of the kiln cooling section is connected to the waste heat utilization device through the second pipeline. The first pipeline and the second pipeline have a common main pipe section. The circulating fan includes a housing, an impeller, a motor, and an inlet pipe. The impeller is rotatably installed in the housing and is connected to the motor transmission. The front end of the housing is connected to the inlet pipe. The impeller includes a rear cover plate, a front cover plate, and blades. A plurality of blades are evenly distributed along the circumference and arranged between the rear cover plate and the front cover plate. However, the existing circulating fan still has the problems of large air volume loss, large noise, reduced air supply stability / efficiency, and the stability and efficiency of the kiln waste heat recovery and reuse device need to be further improved. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a kiln waste heat recovery and reuse device, which can reduce air volume loss, improve air supply stability, improve air supply efficiency and reduce noise through the design / improvement of the blades of the circulating fan, thereby ensuring the stable and efficient operation of the kiln waste heat recovery and reuse device.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A kiln waste heat recovery and reuse device comprises a kiln heating section (1), a kiln cooling section (2), a circulating fan (3), a first pipeline (4), a second pipeline (5), and a waste heat utilization device (6); the kiln heating section is used for heating / drying in the manufacturing process of ceramic tile products; the kiln heating section and the kiln cooling section are connected; the top of the downstream end of the kiln cooling section is connected to the top of the upstream end of the kiln heating section through a first pipeline; the first pipeline is connected to the circulating fan and a control valve; the top of the downstream end of the kiln cooling section is connected to the waste heat utilization device through a second pipeline; the first pipeline and the second pipeline have a common main pipe section; the circulating fan (3) comprises a housing (31), an impeller (32), an electric The invention relates to a motor (33), an inlet pipe (34), an impeller rotatably mounted in a housing and drivingly connected to the motor, a front end of the housing being connected to the inlet pipe, the impeller comprising a rear cover plate (35), a front cover plate (36), and blades (37), a plurality of blades being evenly distributed along the circumferential direction and arranged between the rear cover plate and the front cover plate; the impeller is characterized in that the blades comprise a first blade portion (371) and a second blade portion (372), the first blade portion and the second blade portion being separated by a midpoint in the axial direction of the blade, only a radial outer edge of the first blade portion being provided with a first concave notch (373), the first concave notch being recessed radially inward, and only a second blade portion being provided with a second concave notch (374), the second concave notch being recessed radially outward.

[0005] Furthermore, the first concave notch (373) is arranged adjacent to the dividing line, the second concave notch (374) is arranged adjacent to the dividing line, and the first concave notch and the second concave notch are respectively located on both sides of the axial direction of the dividing line.

[0006] Furthermore, the first concave notch and the second concave notch are in an equilateral or isosceles triangle structure.

[0007] Furthermore, the first blade portion (371) comprises a first arc segment (375), a first straight segment, and a second arc segment (376), and the first arc segment, the first straight segment, and the second arc segment 3 are arranged in sequence from the radial outer side to the radial inner side, and the radial lengths of the first arc segment and the second arc segment are each within 20% of the total radial length of the first blade portion; the first arc segment is bent in a first direction, and the second arc segment is bent in a second direction, and the first direction and the second direction are two opposite directions in the circumferential direction.

[0008] Furthermore, the second blade portion (372) comprises a third arc segment (377), a second straight segment, and a fourth arc segment (378), the third arc segment, the second straight segment, and the fourth arc segment being arranged sequentially from the radial outer side to the radial inner side, and the radial lengths of the third arc segment and the fourth arc segment are each within 20% of the total radial length of the second blade portion; the third arc segment is bent in the second direction, and the fourth arc segment is bent in the first direction.

[0009] Furthermore, the first arc segment (375) has substantially the same radial length as the second arc segment, the third arc segment, and the fourth arc segment, and has substantially the same curvature.

[0010] Furthermore, radial lengths of the first straight section and the second straight section are substantially equal.

[0011] Furthermore, the radial depths of the first concave notch (373) and the second concave notch (374) are each within 20% of the total radial length of the first blade portion or the second blade portion.

[0012] Furthermore, the circulation fan (3) is a centrifugal fan.

[0013] A kiln waste heat recovery and reuse device of the present invention can reduce air volume loss, improve air supply stability, improve air supply efficiency, and reduce noise through the design / improvement of the blades of the circulating fan, thereby ensuring the stable and efficient operation of the kiln waste heat recovery and reuse device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the principle of the kiln waste heat recovery and reuse device of the present invention; Figure 2 This is a schematic diagram of the structure of the circulating fan of the present invention; Figure 3 It is a schematic diagram of the impeller structure of the circulating fan of the present invention; Figure 4 It is a schematic diagram of the structure of the blade (first blade part) of the circulating fan of the present invention; Figure 5 It is a schematic diagram of the structure of the blade (second blade portion) of the circulating fan of the present invention.

[0015] In the figure: kiln heating section 1, kiln cooling section 2, circulating fan 3, first pipeline 4, second pipeline 5, waste heat utilization device 6, casing 31, impeller 32, motor 33, inlet pipe 34, rear cover plate 35, front cover plate 36, blade 37, first blade part 371, second blade part 372, first concave notch 373, second concave notch 374, first arc segment 375, second arc segment 376, third arc segment 377, fourth arc segment 378. DETAILED DESCRIPTION

[0016] In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described in detail in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present invention, which are only used to explain the present invention, not to limit the present invention. It should be noted that, for the convenience of description, only the parts / structures related to the present invention are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should be the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-5 As shown, a kiln waste heat recovery and reuse device includes a kiln heating section 1, a kiln cooling section 2, a circulating fan 3, a first pipeline 4, a second pipeline 5, and a waste heat utilization device 6. The kiln heating section 1 is used for heating / drying in the manufacturing process of ceramic tile products. The kiln heating section 1 is connected to the kiln cooling section 2. The top of the downstream end of the kiln cooling section 2 is connected to the top of the upstream end of the kiln heating section 1 through the first pipeline 4. The first pipeline 4 is connected to the circulating fan 3 and a control valve. The top of the downstream end of the kiln cooling section 2 is connected to the waste heat utilization device 6 through the second pipeline 5. The first pipeline 4 and the second pipeline 5 have a common main pipe section.

[0020] The circulation fan 3 includes a housing 31, an impeller 32, a motor 33, and an inlet pipe 34. The impeller 32 is rotatably installed in the housing 31 and is transmission-connected to the motor 33. The front end / upstream end of the housing 31 is connected to the inlet pipe 34. The impeller 32 includes a rear cover plate 35, a front cover plate 36, and blades 37. A plurality of blades 37 are evenly distributed along the circumferential direction and are arranged between the rear cover plate 35 and the front cover plate 36. The blades 37 include a first blade portion 371 and a second blade portion 372. The first blade portion 371 and the second blade portion 372 are divided by the midpoint of the axial direction (axial direction) of the blade (such as Figure 3 As shown by the middle dotted line, only the radial outer edge of the first blade portion 371 is provided with a first concave notch 373, and the first concave notch 373 is recessed radially inward, and only the second blade portion 372 is provided with a second concave notch 374, and the second concave notch 374 is recessed radially outward.

[0021] The first concave notch 373 is disposed adjacent to / close to the dividing line, and the second concave notch 374 is disposed adjacent to / close to the dividing line. The first concave notch 373 and the second concave notch 374 are respectively located on both sides of the axial direction of the dividing line.

[0022] The first concave notch 373 and the second concave notch 374 are equilateral or isosceles triangle structures.

[0023] A kiln waste heat recovery and reuse device of the present invention is designed / improved through the blades of the circulating fan 3. Specifically, only the radial outer edge of the first blade portion 371 is provided with a first concave notch 373, and the first concave notch 373 is recessed radially inward, and only the second blade portion 372 is provided with a second concave notch 374, and the second concave notch 374 is recessed radially outward. This can reduce air volume loss, improve air supply stability, improve air supply efficiency, and reduce noise, thereby ensuring stable and efficient operation of the kiln waste heat recovery and reuse device.

[0024] Furthermore, the first blade portion 371 includes a first arc segment 375, a first straight segment, and a second arc segment 376. The first arc segment 375, the first straight segment, and the second arc segment 376 are arranged in sequence from the radial outside to the radial inside, and the radial lengths of the first arc segment 375 and the second arc segment 376 are each within 20% of the total radial length of the first blade portion 371.

[0025] The first arc segment 375 bends in a first direction, and the second arc segment 376 bends in a second direction. The first direction and the second direction are two opposite directions in the circumferential direction.

[0026] The second blade portion 372 includes a third arc segment 377, a second straight segment, and a fourth arc segment 378. The third arc segment 377, the second straight segment, and the fourth arc segment 378 are arranged in sequence from the radial outside to the radial inside. The radial lengths of the third arc segment 377 and the fourth arc segment 378 are each within 20% of the total radial length of the second blade portion 372.

[0027] The third arc segment 377 bends toward the second direction, and the fourth arc segment 378 bends toward the first direction.

[0028] In one embodiment, the radial lengths of the first arc segment 375 and the second arc segment 376 , the third arc segment 377 , and the fourth arc segment 378 are substantially equal, and the curvatures are substantially equal.

[0029] The radial lengths of the first straight section and the second straight section are substantially equal.

[0030] The radial depths of the first concave notch 373 and the second concave notch 374 are respectively within 20% of the total radial length of the first blade portion 371 or the second blade portion 372 .

[0031] The circulation fan 3 is a centrifugal fan.

[0032] A kiln waste heat recovery and reuse device of the present invention, through the design / improvement of the blades of the circulating fan 3, specifically, the first blade portion 371 includes a first arc segment 375, a first straight segment, and a second arc segment 376, and the second blade portion 372 includes a third arc segment 377, a second straight segment, and a fourth arc segment 378, which can further better reduce the air volume loss, improve the air supply stability, further improve the air supply efficiency, and reduce noise, thereby ensuring the stable and efficient operation of the kiln waste heat recovery and reuse device.

[0033] A kiln waste heat recovery and reuse device of the present invention can reduce air volume loss, improve air supply stability, improve air supply efficiency, and reduce noise through the design / improvement of the blades of the circulating fan, thereby ensuring the stable and efficient operation of the kiln waste heat recovery and reuse device.

[0034] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A kiln waste heat recovery and reuse device, comprising a kiln heating section (1), a kiln cooling section (2), a circulating fan (3), a first pipeline (4), a second pipeline (5), and a waste heat utilization device (6), wherein the kiln heating section and the kiln cooling section are connected, the top of the downstream end of the kiln cooling section is connected to the top of the upstream end of the kiln heating section through the first pipeline, the first pipeline is connected to the circulating fan and a control valve, and the top of the downstream end of the kiln cooling section is connected to the waste heat utilization device through the second pipeline; the circulating fan comprises a housing (31), an impeller (32), a motor (33), and an inlet pipe (34), the impeller is rotatably mounted in the housing and is transmission-connected to the motor, the front end of the housing is connected to the inlet pipe, the impeller comprises a rear cover plate (35), a front cover plate (36), and blades (37), and a plurality of blades are evenly distributed along the circumferential direction and arranged between the rear cover plate and the front cover plate; the characteristics are as follows: The blade comprises a first blade portion (371) and a second blade portion (372), wherein the first blade portion and the second blade portion are divided by the midpoint of the axial direction of the blade, the radial outer edge of the first blade portion is provided with a first concave notch (373), the first concave notch is recessed radially inward, and the second blade portion is provided with a second concave notch (374), the second concave notch is recessed radially outward.

2. The kiln waste heat recovery and reuse device according to claim 1, characterized in that: The first concave notch (373) is arranged adjacent to the dividing line, the second concave notch (374) is arranged adjacent to the dividing line, and the first concave notch and the second concave notch are respectively located on both sides of the axial direction of the dividing line.

3. The kiln waste heat recovery and reuse device according to claim 2, characterized in that: The first concave notch and the second concave notch are in an equilateral or isosceles triangle structure.

4. The kiln waste heat recovery and reuse device according to claim 1, characterized in that: The first blade portion (371) comprises a first arc segment (375), a first straight segment, and a second arc segment (376), wherein the first arc segment, the first straight segment, and the second arc segment 3 are arranged in sequence from the radial outer side to the radial inner side, and the radial lengths of the first arc segment and the second arc segment are each within 20% of the total radial length of the first blade portion; the first arc segment is bent in a first direction, and the second arc segment is bent in a second direction, and the first direction and the second direction are two opposite directions in the circumferential direction.

5. The kiln waste heat recovery and reuse device according to claim 4, characterized in that: The second blade portion (372) comprises a third arc segment (377), a second straight segment, and a fourth arc segment (378), wherein the third arc segment, the second straight segment, and the fourth arc segment are arranged in sequence from the radial outer side to the radial inner side, and the radial lengths of the third arc segment and the fourth arc segment are each within 20% of the total radial length of the second blade portion; the third arc segment is bent in the second direction, and the fourth arc segment is bent in the first direction.

6. The kiln waste heat recovery and reuse device according to claim 5, characterized in that: The first arc segment (375) has substantially the same radial length as the second arc segment, the third arc segment, and the fourth arc segment, and has substantially the same curvature.

7. The kiln waste heat recovery and reuse device according to claim 6, characterized in that: The radial lengths of the first straight section and the second straight section are substantially equal.

8. The kiln waste heat recovery and reuse device according to claim 7, characterized in that: The radial depths of the first concave notch (373) and the second concave notch (374) are each within 20% of the total radial length of the first blade portion or the second blade portion.

9. The kiln waste heat recovery and reuse device according to claim 8, characterized in that: The circulation fan (3) is a centrifugal fan.

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