Range hood

Abstract

The utility model relates to a range hood, which comprises: a box body, the interior of which is hollow to form a chamber with a smoke inlet and a smoke outlet; the fan system is arranged in the box body; the interior of the cleaning pipe is hollow to form a cleaning channel, the first end of the cleaning channel is open and serves as a water inlet to be connected with an external water source, and the second end of the cleaning channel is open and serves as a water outlet to be opposite to the fan system; along the flowing direction of fluid from the water inlet to the water outlet, the cleaning channel is provided with a first contraction section of which the flow area on the cross section is gradually reduced, a second contraction section which is positioned at the downstream of the first contraction section and of which the flow area on the cross section is further reduced, and a mixing section for connecting the first contraction section and the second contraction section; the air inlet end of the air inlet pipe is communicated with the outside, and the air outlet end of the air inlet pipe is opened in the side wall of the mixing section, so that outside air can enter the mixing section through the air inlet pipe under the action of flowing fluid in the mixing section. Compared with the prior art, the cleaning effect can be improved.

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] A cleaning pipe, wherein the interior of the cleaning pipe is hollow and has a cleaning channel formed therein, wherein the first end of the cleaning channel is open and serves as a water inlet for connecting to an external water source, and the second end of the cleaning channel is open and serves as a water outlet facing the fan system;

[0010] Features:

[0011] Along the flow direction of the fluid from the water inlet to the water outlet, the cleaning channel has a first contraction section with a gradually reduced flow area on the cross section, a second contraction section located downstream of the first contraction section and with a further reduced flow area on the cross section, and a mixing section connecting the first contraction section and the second contraction section;

[0012] The range hood also includes:

[0013] The air inlet pipe has an air inlet end connected to the outside and an air outlet end opened to the side wall of the mixing section, so that the outside air can enter the mixing section through the air inlet pipe under the action of the flowing fluid in the mixing section.

[0014] When in use, the flow rate of the external water source increases after passing through the first contraction section, and the high-speed moving fluid can reduce the pressure in the tube, so that the external air enters the mixing section from the air inlet pipe under the push of atmospheric pressure, and generates bubbles after mixing with the water flow in the mixing section. After the fluid with bubbles passes through the second contraction section, the flow rate further increases, and then it is sprayed from the water outlet of the cleaning pipe to the fan system with a greater impact force, thereby flushing the fan system, and when the fluid contacts the fan system, the bubbles in the fluid burst and act on the fan system, thereby improving the cleaning effect; at the same time, during the acceleration process of the fluid in the two stages, the gas dissolved in the fluid may precipitate to form bubbles, thereby ensuring that there are more bubbles in the fluid output from the water outlet.

[0015] The external water source may be tap water or a liquid detergent.

[0016] Preferably, along the flow direction of the fluid from the water inlet to the water outlet, the flow area of ​​the mixing section in the cross section is consistent, and the upstream end of the mixing section is opposite to and connected with the downstream end of the first contraction section, and the downstream end of the mixing section is opposite to and connected with the upstream end of the second contraction section.

[0017] To ensure an increase in the fluid flow rate, preferably, the ratio of the inner diameters of the downstream end of the first contraction section (i.e., the small end of the first contraction section) to the upstream end (i.e., the large end of the first contraction section) is 1 / 4 to 1 / 8; the ratio of the inner diameters of the downstream end of the second contraction section (i.e., the small end of the second contraction section) to the upstream end (i.e., the large end of the second contraction section) is 1 / 5 to 1 / 10.

[0018] Preferably, the inner diameter of the air inlet pipe is 0.5-2 mm, and the inner diameter of the mixing section is 5-10 mm. In this way, the flow of the fluid in the mixing section is not affected, and sufficient air can be ensured to enter the mixing section from the air inlet pipe.

[0019] Preferably, the first contraction section, the mixing section, and the second contraction section are arranged sequentially from top to bottom, the upper end of the air inlet pipe is the air inlet end, and the lower end of the air inlet pipe is the air outlet end. In this way, the fluid flows from top to bottom, and the flow rate can be further increased by the fluid's own gravity.

[0020] Preferably, the air inlet end of the air inlet pipe is arranged to be tilted upwards, so as to prevent foreign objects from falling into the air inlet pipe and blocking the air inlet pipe.

[0021] In the above-mentioned schemes, preferably, the downstream port of the second contraction section is the water outlet of the cleaning channel.

[0022] Preferably, the fan system is a centrifugal fan having a volute and an impeller rotatably connected to the volute;

[0023] The water outlet of the cleaning channel extends into the volute through the wall surface of the volute and is opposite to the impeller.

[0024] Furthermore, the volute has:

[0025] The front cover is arranged vertically and provided with an air inlet penetrating the wall thickness;

[0026] A rear cover plate, arranged opposite to the front cover plate and spaced apart from the front cover plate;

[0027] 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;

[0028] The water outlet of the cleaning channel is arranged downwards and is arranged on the annular wall of the volute and relatively close to the volute tongue.

[0029] During cleaning, the impeller can be driven to rotate, and the fluid sprayed from the cleaning pipe can be sprayed onto the impeller to clean the impeller circumference. The cleaning fluid attached to the impeller circumference is thrown to the volute inner wall circumference for cleaning under the action of centrifugal force.

[0030] Furthermore, a branch pipe extending outward is provided on the side wall of the mixing section, the inner end of the branch pipe opens on the side wall of the mixing section and is located downstream of the outlet end of the air inlet pipe, the outer end of the branch pipe is a third contraction section having the same shape as the second contraction section, the downstream port of the third contraction section is arranged downward as the output port of the branch pipe, and is arranged on the annular wall of the volute and spaced from the water outlet of the cleaning channel in the front-to-back direction, thereby improving the cleaning range and cleaning effect.

[0031] Preferably, there are two branch pipes, which are arranged one in front and one behind on both sides of the cleaning pipe.

[0032] In order to reduce the influence of the cleaning pipe on the air passage in the volute, preferably, the length of the portion of the cleaning passage extending inwardly relative to the wall surface of the volute is ≤3 mm.

[0033] Compared with the prior art, the utility model has the following advantages: by designing the cleaning pipe to have a structure with a first contraction section, a mixing section, and a second contraction section, and arranging an air inlet pipe, when in use, after the external water source passes through the first contraction section, the flow rate increases, and the high-speed moving fluid can reduce the pressure in the pipe, so that the external air enters the mixing section from the air inlet pipe under the push of atmospheric pressure, and generates bubbles after mixing with the water flow in the mixing section. After the fluid with bubbles passes through the second contraction section, the flow rate further increases, and then it is sprayed from the water outlet of the cleaning pipe to the fan system with a greater impact force, thereby flushing the fan system, and when the fluid contacts the fan system, the bubbles in the fluid burst and act on the fan system, thereby improving the cleaning effect; at the same time, during the acceleration process of the fluid in the two stages, the gas dissolved in the fluid may precipitate to form bubbles, thereby ensuring that there are more bubbles in the fluid output from the water outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0035] Figure 2 A cross-sectional view of an embodiment of the utility model;

[0036] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0037] Figure 4 It is a partial structural schematic diagram of an embodiment of the utility model (the box is omitted). DETAILED DESCRIPTION

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

[0039] like Figures 1 to 4As 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, a cleaning pipe 3, an air intake pipe 4 and a branch pipe 5.

[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 housing 1 and is used to drive the oil smoke flow into the housing 1 from the smoke inlet 11 and discharged from the smoke outlet 12. Specifically, the fan system 2 includes a volute 21, an impeller 22 rotatably connected to 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 21a that penetrates the wall thickness; the rear cover plate 212 is arranged relative to the front cover plate 211 and spaced apart; 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. 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 21b, and the air outlet 21b is opposite to the smoke outlet 12 of the housing 1. When in use, the motor 23 drives the impeller 22 to rotate, and the oil smoke generated by cooking enters the housing 1 through the smoke inlet 11, then enters the volute 214 from the air inlet 21a, and then is discharged from the air outlet 21b and the smoke outlet 12.

[0042] The cleaning pipe 3 is hollow inside to form a cleaning channel 30. The first end of the cleaning channel 30 is open and serves as a water inlet 3a for connecting to an external water source (such as a faucet). The second end of the cleaning channel 30 is open and serves as a water outlet 3b, which is downwardly disposed and extends into the volute 21 through the wall of the volute 21 and is opposite to the impeller 22. Specifically, the water outlet 3b of the cleaning channel 30 is disposed on the annular wall 213 of the volute 21 and is relatively close to the volute tongue 214. The length of the portion of the cleaning channel 30 extending inward relative to the annular wall 213 of the volute 21 is ≤3 mm.

[0043] At the same time, if Figure 3 , 4As shown, along the flow direction of the fluid from the water inlet 3a to the water outlet 3b, the cleaning channel 30 of the cleaning pipe 3 has a first contraction section 31 with a gradually reduced flow area on the cross section, a second contraction section 32 located downstream of the first contraction section 31 and with a further reduced flow area on the cross section, and a mixing section 33 connecting the first contraction section 31 and the second contraction section 32 and with a consistent flow area on the cross section, and the inner diameter of the mixing section 33 is 5 to 10 mm (it can be any value between 5 and 10 mm, such as 5, 7, 8, 10 mm, etc.). In this embodiment, the first contraction section 31, the mixing section 33, and the second contraction section 32 are arranged from top to bottom in sequence to allow the fluid to flow from top to bottom, that is, the upstream end of the first contraction section 31 is its upper end with a larger diameter, the downstream end of the first contraction section 31 is its lower end with a smaller diameter, the upstream end of the second contraction section 32 is its upper end with a larger diameter, the downstream end of the second contraction section 32 is its lower end with a smaller diameter, and the downstream port of the second contraction section 32 is the water outlet 3b of the cleaning channel 30. The upstream end of the mixing section 33 is opposite to and connected with the downstream end of the first contraction section 31, and the inner diameters of the two are consistent. The downstream end of the mixing section 33 is opposite to and connected with the upstream end of the second contraction section 32, and the inner diameters of the two are consistent. At the same time, the ratio of the inner diameter of the downstream end of the first contraction section 31 to the upstream end of the first contraction section 31 is 1 / 4 to 1 / 8 (can be any value between 1 / 4 and 1 / 8, such as 1 / 4, 1 / 5, 1 / 7, 1 / 8, etc.); the ratio of the inner diameter of the downstream end of the second contraction section 32 to the upstream end of the second contraction section 32 is 1 / 5 to 1 / 10 (can be any value between 1 / 5 and 1 / 10, such as 1 / 4, 1 / 5, 1 / 7, 1 / 8, etc.).

[0044] At the same time, a branch pipe 5 extending outward is provided on the side wall of the mixing section 33, the inner end of the branch pipe 5 opens on the side wall of the mixing section 33, the outer end of the branch pipe 5 is a third contraction section 51 having the same shape as the second contraction section 32, the downstream port of the third contraction section 51 is arranged downward as the output port of the branch pipe 5, and extends into the volute 21 through the wall of the volute 21, and is opposite to the impeller 22. In this embodiment, there are two branch pipes 5, one in front and one in back, arranged on both sides of the cleaning pipe 3, and the output ports of the two branch pipes 5 are arranged one in front and one in back at intervals on both sides of the water outlet 3b of the cleaning channel 30.

[0045] The upper end of the air inlet pipe 4 is the air inlet end 4a, which is located outside the box 1 to communicate with the outside. The lower end of the air inlet pipe 4 is the air outlet end 4b, which opens on the side wall of the mixing section 33 and above the branch pipe 5, so that the outside air can enter the mixing section 33 through the air inlet pipe 4 under the action of the flowing fluid in the mixing section 33. In this embodiment, the inner diameter of the air inlet pipe 4 is 0.5-2 mm (it can be any value between 0.5-2 mm, such as 0.5, 1, 2 mm, etc.), which is much smaller than the inner diameter of the mixing section 33, so as not to affect the flow of the fluid in the mixing section 33. And the air inlet end 4a of the air inlet pipe 4 is tilted upward and vertically upward to prevent foreign objects from falling into the air inlet pipe 4 and blocking the air inlet pipe 4. And in this embodiment, there are four air inlet pipes 4, which are arranged at equal intervals along the circumferential direction.

[0046] When in use, after the external water source passes through the first contraction section 31, the flow rate increases, and the high-speed moving fluid can reduce the pressure in the pipe, so that the external air enters the mixing section 33 from the air inlet pipe 4 under the push of atmospheric pressure, and generates bubbles after mixing with the water flow in the mixing section 33. The fluid with bubbles is divided into three paths. After the middle path passes through the second contraction section 32, the flow rate further increases, and then it is sprayed from the water outlet 3b of the cleaning pipe 3 to the fan system 2 with a greater impact force. The two side paths enter the corresponding branch pipes 5 respectively, and after passing through the third contraction section 51, the flow rate further increases, and then it is sprayed from the output port of the branch pipe 5 to the fan system 2 with a greater impact force, thereby flushing the fan system 2, and when the fluid contacts the fan system, the bubbles in the fluid burst and act on the fan system 2, thereby improving the cleaning effect; at the same time, during the acceleration process of the fluid in the two stages, the gas dissolved in the fluid may precipitate to form bubbles, thereby ensuring that there are more bubbles in the fluid output from the water outlet.

[0047] In this embodiment, the cleaned fluid flows downward under the action of its own gravity and is collected in the oil cup at the bottom of the range hood.

[0048] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "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, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0049] 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); A cleaning pipe (3) is hollow inside and has a cleaning channel (30). A first end of the cleaning channel (30) is open and serves as a water inlet (3a) for connecting to an external water source. A second end of the cleaning channel (30) is open and serves as a water outlet (3b) facing the fan system (2). Features: Along the flow direction of the fluid from the water inlet (3a) to the water outlet (3b), the cleaning channel (30) comprises a first contraction section (31) with a gradually decreasing flow area in a cross section, a second contraction section (32) located downstream of the first contraction section (31) and with a further decreasing flow area in a cross section, and a mixing section (33) connecting the first contraction section (31) and the second contraction section (32); The range hood also includes: The air inlet pipe (4) has an air inlet end (4a) connected to the outside, and an air outlet end (4b) opening on the side wall of the mixing section (33), so that the outside air can enter the mixing section (33) through the air inlet pipe (4) under the action of the flowing fluid in the mixing section (33).

2. The range hood according to claim 1, characterized in that: Along the flow direction of the fluid from the water inlet (3a) to the water outlet (3b), the flow area of ​​the mixing section (33) in the cross section is consistent, and the upstream end of the mixing section (33) is opposite to and connected with the downstream end of the first contraction section (31), and the downstream end of the mixing section (33) is opposite to and connected with the upstream end of the second contraction section (32).

3. The range hood according to claim 2, characterized in that: The ratio of the inner diameters of the downstream end to the upstream end of the first contraction section (31) is 1 / 4 to 1 / 8; the ratio of the inner diameters of the downstream end to the upstream end of the second contraction section (32) is 1 / 5 to 1 / 10.

4. The range hood according to claim 3, characterized in that: The inner diameter of the air inlet pipe (4) is 0.5 to 2 mm, and the inner diameter of the mixing section (33) is 5 to 10 mm.

5. The range hood according to claim 1, characterized in that: The first contraction section (31), the mixing section (33), and the second contraction section (32) are arranged in sequence from top to bottom, the upper end of the air intake pipe (4) is the air intake end (4a), and the lower end of the air intake pipe (4) is the air outlet end (4b).

6. The range hood according to claim 5, characterized in that: The air inlet end (4a) of the air inlet pipe (4) is arranged to be inclined upward.

7. The range hood according to any one of claims 1 to 6, characterized in that: The downstream port of the second contraction section (32) is the water outlet (3b) of the cleaning channel (30).

8. The range hood according to claim 7, 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 water outlet (3b) of the cleaning channel (30) extends into the volute (21) through the wall surface of the volute (21) and is opposite to the impeller (22).

9. The range hood according to claim 8, characterized in that: The volute (21) has: A front cover plate (211) is arranged vertically and is provided with an air inlet (21a) 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 (21b) 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 (21b) is opposite to the smoke outlet (12) of the box body (1); The water outlet (3b) of the cleaning channel (30) is arranged downward and is disposed on the annular wall (213) of the volute (21) and relatively close to the volute tongue (214).

10. The range hood according to claim 9, characterized in that: A branch pipe (5) extending outward is provided on the side wall of the mixing section (33); the inner end of the branch pipe (5) opens on the side wall of the mixing section (33) and is located downstream of the outlet end of the air inlet pipe (4); the outer end of the branch pipe (5) is a third contraction section (51) having the same shape as the second contraction section (32); the downstream port of the third contraction section (51) is arranged downward as the outlet of the branch pipe (5), and is arranged on the annular wall (213) of the volute (21) and is spaced apart from the water outlet (3b) of the cleaning channel (30) in the front-to-rear direction.

11. The range hood according to claim 10, characterized in that: There are two branch pipes (5), which are arranged one in front and one behind on both sides of the cleaning pipe (3).

12. The range hood according to claim 8, characterized in that: The length of the portion of the cleaning passage (30) extending inwardly relative to the wall surface of the volute (21) is ≤3 mm.

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