Range hood

Abstract

The utility model discloses a range hood, which comprises a box body, a fan system; an air channel is defined by the pipe wall of the air pipe, the first end of the air channel is open and serves as an air inlet to be communicated with the output end of an external air compressor, and the second end of the air channel is open and serves as an air outlet to face the fan system; a dry ice channel is defined by the pipe wall of the dry ice pipe, the inlet end of the dry ice channel is used for being communicated with the outlet end of a dry ice tank containing dry ice particles, the outlet end of the dry ice channel is inserted into the air pipe through the air outlet, and the pipe wall of the dry ice pipe is opposite to the pipe wall of the corresponding air pipe at intervals to form an annular cavity allowing air to pass through; in the flowing direction of air from the air inlet to the air outlet, at least the part, close to the outlet end of the dry ice pipe, of the annular cavity is a contraction section with the circulation area gradually reduced on the cross section, and therefore dry ice particles enter the air pipe from the dry ice pipe under the action of flowing air in the contraction section. The cleaning device can improve the cleaning effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to a range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It uses the negative pressure generated by the internal fan system to suck the fumes generated by cooking into the housing of the range hood, separate and purify the fumes in the housing, and then discharge them from the smoke outlet on the top of the housing. For example, the structures disclosed in the Chinese utility model patent "Ranger hood" with patent number 202322101902.1 (authorization announcement number CN220355500U) and the Chinese utility model patent "Side-suction range hood" with patent number 202222837318.8 (authorization announcement number CN218864276U).

[0003] When the range hood is in use, oil will adhere to the fan system, affecting the normal operation of the fan system. For this reason, the fan system needs to be cleaned. For example, Chinese utility model patent No. 202222853169.4 "A Range Hood" (authorization announcement No. CN218864280U) discloses a range hood, including a fan system and a cleaning device for cleaning the fan system, wherein the fan system includes a volute, an air inlet is formed on the volute, and the cleaning device includes: a liquid storage box for storing a cleaning medium; a water inlet pipe, the water inlet pipe comprising a water inlet pipe input end and a water inlet pipe output end, the water inlet pipe input end being communicated with the inner side of the liquid storage box, the water inlet pipe output end being arranged at the air inlet of the fan system, so that the negative pressure generated at the air inlet can attract the cleaning medium in the liquid storage box; a drain pipe, the drain pipe comprising a drain pipe input end and a drain pipe output end, the drain pipe input end being communicated with the inner side of the bottom of the volute, the drain pipe output end being able to communicate with the liquid storage box, so that the positive pressure generated at the bottom of the volute can press out the cleaning medium in the liquid storage box.

[0004] During actual use, the oil adheres to the fan system, making it difficult to clean, and the cleaning effect needs to be further improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a range hood capable of improving the cleaning effect in view of the current status of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0007] The box body is hollow inside to form a chamber with a smoke inlet and a smoke outlet;

[0008] A fan system is arranged in the box body, and is used to drive the oil smoke flow into the box body through the smoke inlet and discharged from the smoke outlet;

[0009] It is characterized by also including:

[0010] An air pipe, the wall of which defines an air passage for air flow, a first end of the air passage being open and serving as an air inlet for communicating with an output end of an external air compressor, and a second end of the air passage being open and serving as an air outlet disposed toward the fan system;

[0011] A dry ice tube, wherein the tube wall defines a dry ice channel for the flow of dry ice particles, the inlet end of the dry ice channel is used to communicate with the outlet end of a dry ice tank containing dry ice particles, the outlet end of the dry ice channel is inserted into the air pipe through the air outlet, and the tube wall of the dry ice tube is spaced and opposed to the tube wall of the corresponding air pipe to form an annular cavity for air to pass through, along the flow direction of the air from the air inlet to the air outlet, the annular cavity at least close to the outlet end of the dry ice tube is a contraction section with a gradually reduced flow area on the cross section, so that the dry ice particles enter the air pipe from the dry ice tube under the action of the flowing air in the contraction section.

[0012] In this way, the compressed air in the air pipe increases its flow rate after passing through the contraction section, and the high-speed air flow can reduce the pressure in the pipe, thereby sucking out the dry ice particles in the dry ice tank through the dry ice pipe, and the air flow mixed with dry ice particles is output from the air outlet of the air pipe. At this time, when the dry ice particles moving at a faster speed hit the stains on the fan system, most of their kinetic energy is converted into heat energy, causing the dry ice particles to vaporize and expand in a short time, so that the expanding carbon dioxide forms a shock wave at the air interface. When the wave front sweeps over the stains at a faster speed, the stain particles loosen and soften, and the expanding carbon dioxide airflow behind the wave front follows. Due to the instantaneous increase in volume, the temperature of this carbon dioxide gas mass is very low, which instantly hardens and shrinks the loosened stain particles until they are completely separated from the fan system body, and then are blown away by the air flow, thereby ensuring the cleaning effect of the fan system.

[0013] In addition, dry ice has stable chemical properties, is odorless and non-toxic, cannot burn and does not support combustion, and has little impact on user safety. After being discharged, the dry ice will sublimate and disappear without any residue, thus avoiding the impact of chemical and mechanical cleaning on the range hood.

[0014] In order to form a contraction section, at least a portion of the air pipe may be designed as a cone with a large upstream port and a small downstream port; at least a portion of the dry ice tube may be designed as an inverted cone with a small upstream port and a large downstream port; or at least a portion of the air pipe may be designed as a cone, and at the same time, at least a portion of the dry ice tube may be designed as an inverted cone; or at least a portion of both the air pipe and the dry ice tube may be designed as cones, but the tapers of the two are different, so as to form a contraction section.

[0015] Preferably, the air pipe is partially in the form of a cone with a large upstream port and a small downstream port, and the side wall of the cone is spaced apart from the wall of the corresponding dry ice tube to form a contraction section of the annular cavity.

[0016] Furthermore, along the flow direction of the air from the air inlet to the air outlet, the contraction section has a first contraction section with a gradually reduced flow area on the cross section, and a second contraction section located downstream of the first contraction section and with a further reduced flow area on the cross section. In this way, after the air passes through the first contraction section and the second contraction section, the flow velocity is further increased.

[0017] Furthermore, the outlet end of the dry ice tube is in the form of a trumpet, and forms a second contraction section of an annular cavity with the tube wall of the corresponding air tube.

[0018] Preferably, the portion of the dry ice tube located upstream of the outlet end is a first straight tube body with a uniform flow area in the cross section, and the tube wall of the first straight tube body is spaced opposite to the corresponding cone side wall to form a first contraction section of the annular cavity.

[0019] Preferably, along the flow direction of air from the air inlet to the air outlet, the outlet end of the dry ice tube is located upstream of the downstream port of the cone, and the two are arranged opposite to each other.

[0020] Preferably, the taper ratio between the horn and the cone is 1:5 to 4:1, thereby ensuring that a certain low pressure is formed at the outlet end of the dry ice tube to suck out the dry ice particles and ensure that sufficient dry ice is involved in cleaning.

[0021] Furthermore, the portion of the air pipe located downstream of the cone is a second straight tube body with a consistent flow area in the cross section, the upstream port of the second straight tube body is connected to the downstream port of the cone and the two have the same caliber, and the downstream port of the second straight tube body is the air outlet of the air pipe.

[0022] Preferably, the ratio of the diameter of the inlet end of the dry ice tube to the diameter of the air inlet of the air tube is 1:10 to 1:2, so as to ensure a certain ratio of dry ice particles to compressed air, thereby ensuring a cleaning effect.

[0023] In the above schemes, preferably, the fan system is a centrifugal fan having a volute and an impeller rotatably connected in the volute;

[0024] The air outlet of the air pipe opens on the volute and is opposite to the impeller.

[0025] Preferably, the volute has:

[0026] The front cover is arranged vertically and provided with an air inlet penetrating the wall thickness;

[0027] A rear cover plate, arranged opposite to the front cover plate and spaced apart from the front cover plate;

[0028] The annular wall is disposed between the front cover plate and the rear cover plate, and has a first end portion and a second end portion opposite to each other, a volute tongue is formed at the first end portion, and an upward air outlet is defined between the volute tongue and the second end portion of the annular wall and the front and rear cover plates, and the air outlet is opposite to the smoke outlet of the box body;

[0029] The air outlet of the air pipe is arranged downward and is located on the annular wall of the volute and relatively close to the volute tongue.

[0030] During cleaning, the impeller can be driven to rotate, and the air flow ejected from the air pipe can be sprayed onto the impeller to clean the circumference of the impeller.

[0031] Compared with the prior art, the utility model has the advantages that: by arranging the air pipe and the dry ice pipe, the compressed air in the air pipe increases its flow rate after passing through the contraction section, and the high-speed air flow can reduce the pressure in the pipe, thereby sucking out the dry ice particles in the dry ice tank through the dry ice pipe, and the air flow mixed with the dry ice particles is output from the air outlet of the air pipe. At this time, when the dry ice particles moving at a relatively fast speed hit the stains on the fan system, most of the kinetic energy is converted into heat energy, so that the dry ice particles are vaporized and expanded in a short time, so that the expanding carbon dioxide forms a shock wave at the air interface. When the wave surface sweeps over the stains at a relatively fast speed, the stain particles are loosened and softened, and the expanding carbon dioxide air flow behind the wave surface follows. Due to the instantaneous increase in volume, the temperature of this carbon dioxide gas mass is very low, and the already loosened stain particles are instantly hardened and contracted until they are completely separated from the fan system body, and then blown away by the air flow, thereby ensuring the cleaning effect of the fan system.

[0032] In addition, dry ice has stable chemical properties, is odorless and non-toxic, cannot burn and does not support combustion, and has little impact on user safety. After being discharged, the dry ice will sublimate and disappear without any residue, thus avoiding the impact of chemical and mechanical cleaning on the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a partial structural schematic diagram of an embodiment of the utility model;

[0034] Figure 2 It is a cross-sectional view of an embodiment of the utility model (the cross section is a vertical plane extending left and right);

[0035] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0036] Figure 4 It is a cross-sectional view of an embodiment of the utility model (the cross-section is a vertical plane extending front and back);

[0037] Figure 5 for Figure 4 Enlarged view of part B in the middle. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] like Figures 1 to 5 As shown, a preferred embodiment of a range hood of the utility model is shown, and the range hood includes a housing 1, a fan system 2, an air pipe 3 and a dry ice pipe 4.

[0040] The box body 1 is hollow inside to form a chamber, a smoke inlet 11 is provided on the front side wall of the chamber, and a smoke outlet 12 is provided on the top wall of the chamber.

[0041] like Figure 2 , 4 As shown, the fan system 2 is an existing centrifugal fan, which is arranged in the box body 1, and is used to drive the oil smoke airflow from the smoke inlet 11 into the box body 1 and discharged from the smoke outlet 12. Specifically, the fan system 2 includes a volute 21, an impeller 22 rotatably connected in the volute 21, and a motor 23 for driving the impeller 22 to rotate. The volute 21 has a front cover plate 211, a rear cover plate 212 and an annular wall 213, the front cover plate 211 is vertically arranged and provided with an air inlet 2a that penetrates the wall thickness; the rear cover plate 212 is arranged relative to the front cover plate 211; the annular wall 213 is arranged between the front cover plate 211 and the rear cover plate 212, and has a first end and a second end opposite to each other, and a volute tongue 214 is formed at the first end, and the volute tongue 214 and the second end of the annular wall 213 and the front and rear cover plates 212 jointly define an upward air outlet 2b, and the air outlet 2b is opposite to the smoke outlet 12 of the box body 1. When in use, the motor 23 drives the impeller 22 to rotate, and the oil smoke generated by cooking enters the box body 1 through the smoke inlet 11, then enters the volute 214 from the air inlet 2a, and is then discharged from the air outlet 2b and the smoke outlet 12.

[0042] The air pipe 3 is vertically arranged, and its pipe wall defines an air passage 30 for air flow. The upper end of the air passage 30 is open and serves as an air inlet 3a for communicating with the output end of the external air compressor, and the lower end of the air passage 30 is open and serves as an air outlet 3b, which is opened on the annular wall 213 of the volute 21, relatively close to the volute tongue 214, and opposite to the impeller 22. In this embodiment, the lower part of the air pipe 3 is a cone 31 with a large upper end and a small lower end, and the part of the air pipe 3 located at the lower side of the cone 31 is a second straight tube body 32 with a uniform flow area in the cross section, the upper end of the second straight tube body 32 is connected to the lower end of the cone 31, and the two have the same caliber, and the lower end of the second straight tube body 32 is the air outlet 3b of the air pipe 3.

[0043] The dry ice tube 4 is vertically arranged, and its tube wall defines a dry ice channel 40 for the flow of dry ice particles. The inlet end 4a at the upper end of the dry ice channel 40 is used to communicate with the outlet end 4b of the dry ice tank containing dry ice particles, and the ratio of the diameter of the inlet end 4a of the dry ice tube 4 to the diameter of the air inlet 3a of the air tube 3 is 1:10 to 1:2 (it can be any value between 1:10 and 1:2, such as 1:10, 1:8, 1:5, 1:2, etc.). The outlet end 4b at the lower end of the dry ice channel 40 is inserted into the air tube 3 through the air outlet 3b, and is arranged corresponding to the cone 31 of the air tube 3, so that the tube wall of the dry ice tube 4 is spaced opposite to the tube wall of the corresponding air tube 3 to form an annular cavity 300 for air to pass through. The outlet end 4b of the dry ice tube 4 is in the form of a trumpet 41, and forms a second contraction section 312 of the annular cavity 300 with the side wall of the cone 31 of the corresponding air tube 3. The portion of the dry ice tube 4 located upstream of the outlet end 4b is a first straight tube body 42 with a uniform flow area in the cross section. The tube wall of the first straight tube body 42 is spaced opposite to the corresponding side wall of the cone 31 to form a first contraction section 311 of the annular cavity 300. Along the flow direction of the air from top to bottom, the flow area in the cross section of the first contraction section 311 gradually decreases, and the flow area in the cross section of the second contraction section 312 further decreases, so that the dry ice particles enter the air tube 3 from the dry ice tube 4 under the action of the flowing air in the first and second contraction sections. In this embodiment, the taper ratio between the horn body 41 and the cone 31 is 1:5 to 4:1 (it can be any value between 1:5 and 4:1, such as 1:5, 1:1, 2:1, 4:1, etc.). At the same time, the outlet end 4b of the dry ice tube 4 is located upstream of the lower end of the cone 31, and the two are arranged relative to each other.

[0044] After the compressed air in the air pipe passes through the first contraction section 311 and the second contraction section 312 in sequence, the flow velocity increases, and the high-speed air flow can reduce the pressure in the pipe, so that the dry ice particles in the dry ice tank are sucked out through the dry ice pipe, and the induced air flow mixed with the dry ice particles sucked out is continuously driven and accelerated by the outer ring compressed air flow, and at the same time is continuously squeezed by the outer ring compressed air flow to form a conical air flow, and after entering the second straight tube body 32, it continues to be squeezed by the outer ring compressed air flow, and finally the induced air flow pressure is increased to be equal to the pressure of the outer ring compressed air flow, so it flows in parallel, and then together from the air outlet 3b of the air pipe 3. Output, at this time, when the dry ice particles moving at a faster speed hit the stains on the fan system 2, most of the kinetic energy is converted into heat energy, causing the dry ice particles to vaporize and expand in a short time, so the expanding carbon dioxide forms a shock wave at the air interface. When the wave front sweeps over the stains at a faster speed, the stain particles are loosened and softened, and the expanding carbon dioxide airflow behind the wave front follows. Due to the instantaneous increase in volume, the temperature of this carbon dioxide air mass is very low, which makes the already loosened stain particles instantly harden and shrink until they are completely separated from the fan system body, and then blown away by the air flow, thereby ensuring the cleaning effect of the fan system.

[0045] In this embodiment, the cleaned dirt passes through the through hole 210 at the bottom of the volute 21 and is collected in the oil cup at the bottom of the range hood. Figure 2 .

[0046] In addition, dry ice has stable chemical properties, is odorless and non-toxic, cannot burn and does not support combustion, and has little impact on user safety. After being discharged, the dry ice will sublimate and disappear without any residue, thus avoiding the impact of chemical and mechanical cleaning on the range hood.

[0047] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0048] The term "vertical" is also used in the specification and claims of the present utility model, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

Claims

1. A range hood, comprising: The box body (1) is hollow inside to form a chamber with a smoke inlet (11) and a smoke outlet (12); A fan system (2) is disposed in the housing (1) and is used to drive the oil smoke flow into the housing (1) through the smoke inlet (11) and to be discharged through the smoke outlet (12); Features Also included are: An air pipe (3), the wall of which defines an air passage (30) for air flow, wherein a first end of the air passage (30) is open and serves as an air inlet (3a) for communicating with an output end of an external air compressor, and a second end of the air passage (30) is open and serves as an air outlet (3b) disposed toward the fan system (2); A dry ice tube (4) has a tube wall defining a dry ice channel (40) for the flow of dry ice particles. The inlet end (4a) of the dry ice channel (40) is used to communicate with the outlet end (4b) of a dry ice tank containing dry ice particles. The outlet end (4b) of the dry ice channel (40) is inserted into an air pipe (3) through an air outlet (3b). The tube wall of the dry ice tube (4) is spaced apart from the tube wall of the corresponding air pipe (3) to form an annular cavity (300) for the passage of air. Along the flow direction of the air from the air inlet (3a) to the air outlet (3b), at least the portion of the annular cavity (300) close to the outlet end (4b) of the dry ice tube (4) is a contraction section (310) with a gradually decreasing flow area in a cross section, so that the dry ice particles enter the air pipe (3) from the dry ice tube (4) under the action of the flowing air in the contraction section (310).

2. The range hood according to claim 1, characterized in that: The air pipe (3) is partially in the form of a cone (31) with a large upstream port and a small downstream port, and the side wall of the cone (31) is spaced apart from the wall of the corresponding dry ice tube (4) to form a contraction section (310) of the annular cavity (300).

3. The range hood according to claim 2, characterized in that: Along the flow direction of air from the air inlet (3a) to the air outlet (3b), the contraction section (310) comprises a first contraction section (311) with a gradually decreasing flow area in a cross section, and a second contraction section (312) located downstream of the first contraction section (311) with a further decreasing flow area in a cross section.

4. The range hood according to claim 3, characterized in that: The outlet end (4b) of the dry ice tube (4) is in the form of a trumpet (41), and forms a second contraction section (312) of the annular cavity (300) with the corresponding tube wall of the air tube (3).

5. The range hood according to claim 4, characterized in that: The portion of the dry ice tube (4) located upstream of the outlet end (4b) is a first straight tube body (42) having a uniform flow area in the cross section, and the tube wall of the first straight tube body (42) is spaced apart from the side wall of the corresponding cone (31) to form a first contraction section (311) of the annular cavity (300).

6. The range hood according to claim 4, characterized in that: Along the flow direction of air from the air inlet (3a) to the air outlet (3b), the outlet end (4b) of the dry ice tube (4) is located upstream of the downstream port of the cone (31), and the two are arranged opposite to each other.

7. The range hood according to claim 4, characterized in that: The taper ratio between the horn body (41) and the cone (31) is 1:5 to 4:

1.

8. The range hood according to claim 2, characterized in that: The portion of the air pipe (3) located downstream of the cone (31) is a second straight pipe body (32) having a uniform flow area in the cross section. The upstream port of the second straight pipe body (32) is connected to the downstream port of the cone (31) and the two have the same caliber. The downstream port of the second straight pipe body (32) is the air outlet (3b) of the air pipe (3).

9. The range hood according to claim 1, characterized in that: The ratio of the diameter of the inlet end (4a) of the dry ice tube (4) to the diameter of the air inlet (3a) of the air tube (3) is 1:10 to 1:

2.

10. The range hood according to any one of claims 1 to 9, characterized in that: The fan system (2) is a centrifugal fan having a volute (21) and an impeller (22) rotatably connected to the volute (21); The air outlet (3b) of the air pipe (3) opens on the volute (21) and is opposite to the impeller (22).

11. The range hood according to claim 10, characterized in that: The volute (21) has: A front cover plate (211) is arranged vertically and is provided with an air inlet (2a) penetrating the wall thickness; A rear cover plate (212) is arranged relative to and spaced from the front cover plate (211); The annular wall (213) is arranged between the front cover plate (211) and the rear cover plate (212), and has a first end and a second end opposite to each other, a volute tongue (214) is formed at the first end, and an upward air outlet (2b) is defined by the volute tongue (214), the second end of the annular wall (213), and the front and rear cover plates (212), and the air outlet (2b) is opposite to the smoke outlet (12) of the box body (1); The air outlet (3b) of the air pipe (3) is arranged downward and is located on the annular wall (213) of the volute (21) and relatively close to the volute tongue (214).

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