Check valve, low-resistance exhaust device and range hood

Abstract

This invention provides a check valve, a low-resistance exhaust device, and a range hood, relating to the technical field of fume purification equipment. The check valve includes a valve body comprising a gradually expanding section whose diameter expands outwards along the axial airflow direction, and a straight pipe section whose diameter remains constant outwards along the axial airflow direction; both the gradually expanding section and the straight pipe section have rectangular cross-sections. The low-resistance exhaust device includes the check valve. The range hood includes a low-resistance exhaust device. This check valve alleviates the technical problem of rapid local cross-sectional changes and significant energy loss in check valves with a height of approximately 100mm, achieving the technical effects of increasing airflow and reducing noise.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification equipment technology, and in particular to a check valve, a low-resistance exhaust device, and an oil fume hood. Background Technology

[0002] A range hood, also known as a kitchen exhaust hood, is a kitchen appliance used to purify the kitchen environment. It can quickly remove the exhaust gases produced by the stove and the fumes generated during cooking and exhaust them outdoors, thereby purifying the kitchen environment.

[0003] Currently, most high-rise residential buildings adopt centralized smoke exhaust. The indoor range hood is connected to the public flue through the flue pipe, check valve and so that the oil fumes in the kitchen are discharged into the public flue through the flue pipe.

[0004] In existing technology, range hoods generally exhaust smoke vertically upwards, while the common exhaust duct is usually located on the left or right side of the range hood, with its opening horizontal. Therefore, it is necessary to redirect the airflow from vertical to horizontal using ductwork, which is typically achieved by bending deformable aluminum foil ducts.

[0005] Some range hoods have check valves installed at the air outlet to prevent backflow. Typically, these check valves are installed at a height of around 100mm, which presents at least the following problems:

[0006] 1. The airflow at the exhaust vent of the range hood needs to pass through two locations with significant pressure loss: a check valve that changes diameter and an aluminum foil duct that deflects the airflow. This results in a loss of overall performance and increased noise.

[0007] 2. Due to the obvious wavy lines and wrinkles on the inner wall of the aluminum foil duct, the losses are relatively large in this area;

[0008] 3. Due to insufficient overall rigidity of aluminum foil ducts, they are prone to deformation and displacement, resulting in damage, increased resistance, and abnormal noise. Summary of the Invention

[0009] The purpose of this invention is to provide a check valve, a low-resistance exhaust device, and a range hood to alleviate the technical problems existing in the prior art where the check valve is about 100mm high, the local cross-section changes rapidly, and the losses are relatively large.

[0010] In a first aspect, the present invention provides a check valve, comprising: a valve body, the valve body comprising a gradually expanding section whose diameter gradually expands outward along the air outlet direction of the axis and a check valve straight pipe section whose diameter remains unchanged outward along the air outlet direction of the axis;

[0011] Both the expanding section and the straight pipe section of the check valve have rectangular cross-sections.

[0012] Furthermore, the expanding section and the straight pipe section of the check valve are connected by a circular arc surface transition.

[0013] Furthermore, the two opposing surfaces of the first group of valve bodies are both side planes;

[0014] The second group of the valve body includes a lower inclined plane and an upper straight plane on both sides, and the inclined plane and the straight plane are connected by the arc surface.

[0015] Beneficial effects:

[0016] The check valve provided by this invention includes a gradually expanding section whose diameter gradually expands outward along the air outlet direction along the axis, and a check valve straight pipe section whose diameter remains unchanged outward along the air outlet direction along the axis. The cross-sections of both the gradually expanding section and the check valve straight pipe section are rectangular. It can be seen that this check valve eliminates the square-to-round diameter transition section, and the rectangular cross-section design makes the cross-sectional change relatively gradual, reduces the flow velocity, and reduces the local losses of the check valve straight pipe section.

[0017] Secondly, the present invention provides a low-resistance exhaust device, comprising: a connecting pipe with a smooth inner wall and a check valve as described in any of the foregoing embodiments;

[0018] The connecting pipe is fixedly connected to the straight pipe section of the check valve.

[0019] Furthermore, the connecting pipe includes an inlet section, an outlet section, and an intermediate pipe section connecting the two;

[0020] The inlet section has a rectangular cross-section, the outlet section has a circular cross-section, and the intermediate pipe section is a curved pipe section that transitions from the rectangular section to the circular section.

[0021] Furthermore, the axis of the inlet section is perpendicular to the axis of the outlet section, and the bend section is a 90° bend.

[0022] Furthermore, the inlet section includes a straight pipe section with a constant diameter along the air outlet direction along the axis, and a tapering section with a gradually decreasing diameter along the air outlet direction along the axis.

[0023] Furthermore, the centerline radius R of the intermediate pipe section ranges from 85 to 250 mm;

[0024] And / or, the intermediate pipe section and the tapering section are referred to as the variable diameter transition section, and the maximum dimension H of the variable diameter transition section along the air outlet direction of the axis ranges from 200 to 350 mm;

[0025] And / or, the diameter D of the outlet section ranges from 150 to 200 mm.

[0026] Furthermore, the connecting pipe is equipped with an air guide plate inside;

[0027] The air guide plate extends from the middle pipe section to the outlet section along the air outlet direction and divides the internal space of the connecting pipe into at least two air guide chambers.

[0028] The air guide plate is configured as a flat surface at the position corresponding to the outlet section.

[0029] Furthermore, the air guide plate has wavy serrations at one end near the outlet section;

[0030] The waveform amplitude of the wavy sawtooth is A, and the peak spacing is L;

[0031] When the maximum flow velocity at the outlet section is approximately 15 m / s, 3 mm < L < 10 mm, and 0.5 L < A < L.

[0032] Furthermore, a rectifier screen is provided inside the connecting pipe;

[0033] The rectifier mesh is located at the bend of the intermediate pipe section.

[0034] Furthermore, the angle between the rectifier mesh and the cross-section of the inlet section ranges from 20° to 45°;

[0035] And / or, the aperture ratio of the rectifier mesh is between 60% and 90%.

[0036] Furthermore, the inlet section is nested within the straight pipe section of the check valve.

[0037] Furthermore, one of the inlet section and the straight pipe section of the check valve is provided with a recess, and the other is provided with a mounting hole;

[0038] Fasteners are used to connect the recessed platform and the mounting hole.

[0039] Furthermore, the recessed platform is configured in multiple groups, and the multiple groups of the recessed platform are spaced apart along the air outlet direction of the inlet section axis.

[0040] The mounting hole can be matched with one of the multiple sets of recesses.

[0041] Beneficial effects:

[0042] The low-resistance exhaust device provided by the present invention includes the aforementioned check valve. Therefore, the technical advantages and effects that the low-resistance exhaust device can achieve also include the technical advantages and effects that the check valve can achieve, which will not be repeated here.

[0043] Thirdly, the present invention provides a range hood, comprising: a range hood body and a low-resistance exhaust device as described in any of the foregoing embodiments.

[0044] Beneficial effects:

[0045] The range hood provided by the present invention includes the aforementioned low-resistance exhaust device. Therefore, the technical advantages and effects that the range hood can achieve also include the technical advantages and effects that the low-resistance exhaust device can achieve, which will not be repeated here. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of the check valve provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the low-resistance exhaust device provided in an embodiment of the present invention;

[0049] Figure 3 This is a split diagram of the low-resistance exhaust device provided in an embodiment of the present invention;

[0050] Figure 4 This is the front view of the connecting pipe;

[0051] Figure 5 for Figure 4 Right view of the connecting pipe shown;

[0052] Figure 6 This is a cross-sectional view of the connecting pipe;

[0053] Figure 7 This is a top view of the air guide plate;

[0054] Figure 8 for Figure 7 A magnified view of the area at point X shown;

[0055] Figure 9 This is a cross-sectional view of the low-resistance exhaust device provided in an embodiment of the present invention;

[0056] Figure 10 for Figure 9 A magnified view of a portion of point B is shown below;

[0057] Figure 11 This is a schematic diagram illustrating the height adjustment of the low-resistance exhaust device provided in an embodiment of the present invention;

[0058] Figure 12 This is a schematic diagram of the structure of a range hood provided in an embodiment of the present invention;

[0059] Figure 13This is a partial structural diagram of a range hood provided in an embodiment of the present invention.

[0060] icon:

[0061] 100 - Valve body; 110 - Diverging section; 120 - Straight pipe section of check valve; 130 - Arc surface; 140 - Side plane; 111 - Inclined plane; 121 - Straight plane; 122 - Mounting hole;

[0062] 200 - Connecting pipe; 210 - Inlet section; 220 - Outlet section; 230 - Intermediate pipe section; 211 - Straight connecting pipe section; 212 - Gradient section; 2111 - Recessed platform;

[0063] 300 - Air guide plate; 310 - Wavy serrations;

[0064] 400-rectifier grid;

[0065] 500 - Fasteners;

[0066] 600 - Range hood body. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0068] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0069] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0070] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0072] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0073] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0074] Reference Figure 1 This embodiment provides a check valve, which includes a valve body 100. The valve body 100 includes a gradually expanding section 110 whose diameter gradually expands outward along the air outlet direction of the axis and a check valve straight pipe section 120 whose diameter remains unchanged outward along the air outlet direction of the axis. The cross-sections of the gradually expanding section 110 and the check valve straight pipe section 120 are both rectangular.

[0075] The check valve provided in this embodiment eliminates the square-to-round diameter transition section, and the cross-section is set to be rectangular, which makes the cross-section change relatively gradual, reduces the flow velocity, and at the same time reduces the local loss of the straight pipe section 120 of the check valve.

[0076] Please continue to refer to Figure 1 The gradual expansion section 110 and the straight pipe section 120 of the check valve are connected by a circular arc surface 130. This arrangement makes the airflow passing through this section smoother and further reduces local losses.

[0077] In one specific embodiment of this application, the two oppositely arranged surfaces of the first group of valve bodies 100 are both side planes 140; the two surfaces of the second group of valve bodies 100 each include a lower inclined plane 111 and an upper straight plane 121, and the inclined plane 111 and the straight plane 121 are connected by an arc surface 130.

[0078] Reference Figure 2 and Figure 3 This embodiment also provides a low-resistance exhaust device, which includes a smooth-walled connecting pipe 200 and a check valve as described in the previous embodiment; the connecting pipe 200 is fixedly connected to the straight pipe section 120 of the check valve. Since the low-resistance exhaust device provided in this embodiment includes the aforementioned check valve, the technical advantages and effects achieved by this low-resistance exhaust device also include those achieved by the check valve, which will not be elaborated further here.

[0079] In addition, the inner wall of the connecting pipe 200 is smooth, and with a certain curvature, local losses can be minimized. Furthermore, the connecting pipe 200 can be made of injection molding or sheet metal, resulting in a stable structure that is not easily damaged by deformation.

[0080] Specifically, refer to Figure 3 The connecting pipe 200 includes an inlet section 210, an outlet section 220, and an intermediate pipe section 230 connecting the two; the inlet section 210 has a rectangular cross-section, the outlet section 220 has a circular cross-section, and the intermediate pipe section 230 is a bent pipe section that transitions from rectangular to circular.

[0081] By combining the bend section and the two resistance points, inlet section 210 and outlet section 220, the resistance coefficient is much smaller than that of two separate resistance points connected in series.

[0082] In one specific embodiment, the axis of the inlet section 210 is perpendicular to the axis of the outlet section 220, and the bend section is a 90° bend.

[0083] Please continue to refer to Figure 3 The inlet section 210 includes a straight pipe section 211 with a constant diameter along the air outlet direction and a tapered section 212 with a gradually decreasing diameter along the air outlet direction. This design allows the inlet section 210 to transition to the bend section more smoothly.

[0084] In this embodiment, refer to Figure 4 The centerline radius R of the intermediate pipe section 230 ranges from 85 to 250 mm. For example, the centerline radius R of the bend section can be any value from 85 to 250 mm.

[0085] Please continue to refer to Figure 4The intermediate pipe section 230 and the tapered section 212 are called the variable diameter transition section. The maximum dimension H of the variable diameter transition section along the air outlet direction of the axis is in the range of 200 to 350 mm. For example, H can be any value in the range of 200 to 350 mm.

[0086] Reference Figure 5 The diameter D of the outlet section 220 ranges from 150 to 200 mm. For example, the diameter D of the outlet section 220 can be any value between 150 and 200 mm.

[0087] Reference Figure 3 and Figure 6 The connecting pipe 200 is provided with an air guide plate 300; the air guide plate 300 extends from the middle pipe section 230 to the outlet section 220 along the air outlet direction and divides the internal space of the connecting pipe 200 into at least two air guide chambers; wherein, the air guide plate 300 is set as a flat surface at the position corresponding to the outlet section 220.

[0088] An air guide plate 300 is provided inside the connecting pipe 200 to further reduce local losses. The air guide plate 300 is designed as a thin sheet structure, which can guide the airflow to change direction at the bend section. Furthermore, the air guide plate 300 is designed as a flat surface at the position corresponding to the outlet section 220, which can straighten the airflow from the arc surface to the direction parallel to the outlet section 220.

[0089] In this embodiment, the air guide plate 300 is set in two sets, which are arranged vertically to divide the internal space of the connecting pipe 200 into three air guide chambers.

[0090] Reference Figure 7 and Figure 8 The air guide plate 300 is provided with a wavy sawtooth 310 at one end near the outlet section 220, that is, the tail end of the air guide plate 300 is set as a wavy line, which can reduce the aerodynamic loss and noise caused by flow separation.

[0091] Specifically, the waveform amplitude of the wavy sawtooth 310 is A, and the peak spacing is L; among them, when the highest flow velocity of the outlet section 220 is about 15m / s, 3mm < L < 10mm, and 0.5L < A < L.

[0092] For example, L can be any value from 3 to 10 mm; A can be 0.5L, 0.6L, 0.7L, 0.8L, 0.9L or 1.0L.

[0093] Please continue to refer to Figure 3 and Figure 6 The connecting pipe 200 is equipped with a rectifier mesh 400 inside; the rectifier mesh 400 is located at the bend of the intermediate pipe section 230.

[0094] Optionally, the angle α between the rectifier mesh 400 and the cross-section of the inlet section 210 is in the range of 20° to 45°; the opening ratio of the rectifier mesh 400 is between 60% and 90%, which can play a role in sorting and rectifying the turbulent airflow at the bend of the intermediate pipe section 230, reducing the noise of the airflow at the connecting pipe 200, and reducing the turbulence and vortex of the airflow at the intermediate pipe section 230.

[0095] For example, the included angle α between the rectifier mesh 400 and the cross section of the inlet section 210 can be 20°, 25°, 30°, 35°, 40° or 45°, etc.

[0096] Based on the above embodiment, the inlet section 210 is nested within the check valve straight pipe section 120.

[0097] Reference Figure 9 and Figure 10 One of the inlet section 210 and the check valve straight pipe section 120 is provided with a recess 2111, and the other is provided with a mounting hole 122; a fastener 500 connects the recess 2111 and the mounting hole 122.

[0098] Specifically, the recessed platform 2111 is configured in multiple sets, and the multiple sets of recessed platforms 2111 are spaced apart along the air outlet direction of the axis of the inlet section 210; the mounting hole 122 can be matched with one of the multiple sets of recessed platforms 2111.

[0099] Optionally, fastener 500 can be a bolt, screw, or locating pin.

[0100] When the fastener 500 is a bolt or screw, the inner wall of the recess 2111 is provided with an internal thread, and the bolt or screw passes through the mounting hole and is threadedly connected to the internal thread of the recess 2111.

[0101] When fastener 500 is a locating pin, the locating pin is adapted to the recess, and the locating pin passes through the mounting hole and the recess 2111 in sequence.

[0102] Furthermore, in order to improve the stability of both the inlet section 210 and the check valve straight pipe section 120, the recessed platform 2111 is symmetrically arranged relative to the inlet section 210, and correspondingly, the check valve straight pipe section 120 is provided with symmetrically arranged mounting holes 122.

[0103] During installation, the height of the low-resistance exhaust device can be adjusted according to the actual installation height. Specifically, by sliding and extending the inlet section 210 and the straight pipe section 120 of the check valve, the mounting hole 122 and the recessed platform 2111 are aligned, and then fixed with fasteners 500 to achieve the effect of adjusting the height. Furthermore, by rotating the connecting pipe 200, the outlet section 220 can be turned to the left or right to adapt to the situation where the left and right sides of the air outlets in different kitchens are inconsistent.

[0104] Specifically, refer to Figure 11 The relative sliding expansion and contraction between the inlet section 210 and the straight pipe section 120 of the check valve shortens the distance between them, thereby reducing the overall height of the connecting pipe 200.

[0105] Reference Figure 12 This embodiment also provides a range hood, which includes a range hood body 600 and the low-resistance exhaust device of the aforementioned embodiment. Since the range hood provided in this embodiment includes the aforementioned low-resistance exhaust device, the technical advantages and effects achieved by this range hood also include those achieved by the low-resistance exhaust device, which will not be elaborated further here.

[0106] Reference Figure 13 The range hood body 600 has a volute inside, and one end of the valve body 100 is fixedly connected to the air outlet of the volute.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-resistance exhaust device, characterized in that, It includes a smooth inner wall connecting pipe (200) and a check valve. The check valve includes a valve body (100), which includes a gradually expanding section (110) whose diameter gradually expands outward along the air outlet direction of the axis and a check valve straight pipe section (120) whose diameter remains unchanged outward along the air outlet direction of the axis. The cross-sections of the expanding section (110) and the straight pipe section (120) of the check valve are both rectangular; The connecting pipe (200) is fixedly connected to the straight pipe section (120) of the check valve; The connecting pipe (200) includes an inlet section (210), an outlet section (220), and an intermediate pipe section (230); The connecting pipe (200) is provided with a rectifier mesh (400) inside; The rectifier mesh (400) is disposed at the bend of the intermediate pipe section (230); The connecting pipe (200) is provided with an air guide plate (300) inside; The air guide plate (300) extends from the intermediate pipe section (230) to the outlet section (220) along the air outlet direction, and divides the internal space of the connecting pipe (200) into at least two air guide chambers; The air guide plate (300) and the outlet section (220) are respectively set as flat surfaces.

2. The low-resistance exhaust device according to claim 1, characterized in that, The expanding section (110) and the straight pipe section (120) of the check valve are connected by a circular arc surface (130).

3. The low-resistance exhaust device according to claim 2, characterized in that, The two oppositely arranged surfaces of the first group of valve bodies (100) are both side planes (140). The second group of the valve body (100) includes a lower inclined plane (111) and an upper straight plane (121) on both sides, and the inclined plane (111) and the straight plane (121) are connected by the arc surface (130).

4. The low-resistance exhaust device according to claim 1, characterized in that, The inlet section (210) has a rectangular cross-section, the outlet section (220) has a circular cross-section, and the intermediate pipe section (230) is a bent pipe section that transitions from the rectangular section to the circular section.

5. The low-resistance exhaust device according to claim 4, characterized in that, The axis of the inlet section (210) is perpendicular to the axis of the outlet section (220), and the bend section is a 90° bend section.

6. The low-resistance exhaust device according to claim 5, characterized in that, The inlet section (210) includes a straight pipe section (211) whose diameter remains constant outward along the air outlet direction of the axis, and a tapering section (212) whose diameter gradually decreases outward along the air outlet direction of the axis.

7. The low-resistance exhaust device according to claim 6, characterized in that, The centerline radius R of the intermediate pipe section (230) ranges from 85 to 250 mm; And / or, the intermediate pipe section (230) and the tapered section (212) are called the variable diameter transition section, and the maximum dimension H of the variable diameter transition section along the air outlet direction of the axis is in the range of 200~350mm; And / or, the diameter D of the outlet section (220) ranges from 150 to 200 mm.

8. The low-resistance exhaust device according to claim 1, characterized in that, The air guide plate (300) has a wavy serration (310) at one end near the outlet section (220); The waveform amplitude of the wavy sawtooth (310) is A, and the peak spacing is L; When the maximum flow velocity of the outlet section (220) is about 15 m / s, 3 mm < L < 10 mm, and 0.5 L < A < L.

9. The low-resistance exhaust device according to claim 1, characterized in that, The included angle between the rectifier mesh (400) and the cross section of the inlet section (210) is in the range of 20°~45°; And / or, the aperture ratio of the rectifier mesh (400) is between 60% and 90%.

10. The low-resistance exhaust device according to any one of claims 1-9, characterized in that, The inlet section (210) is nested within the check valve straight pipe section (120).

11. The low-resistance exhaust device according to claim 10, characterized in that, One of the inlet section (210) and the check valve straight pipe section (120) is provided with a recess (2111), and the other is provided with a mounting hole (122). A fastener (500) is connected between the recess (2111) and the mounting hole (122).

12. The low-resistance exhaust device according to claim 11, characterized in that, The recessed platform (2111) is configured in multiple groups, and the multiple groups of the recessed platform (2111) are spaced apart along the air outlet direction of the axis of the inlet section (210); The mounting hole (122) can be matched with one of the multiple sets of recesses (2111).

13. A range hood, characterized in that, include: The range hood body (600) and the low-resistance exhaust device according to any one of claims 1-12.

Images