CN113309738A - Volute check valve assembly and range hood - Google Patents

Abstract

The invention provides a volute check valve assembly and a range hood, and relates to the technical field of range hoods, wherein the volute check valve assembly comprises: a volute and a check valve, both of which have a first peripheral edge and a second peripheral edge; a step structure is arranged at the end part of the first surrounding edge, and comprises a radial end face connected with the inner side wall of the first surrounding edge and an axial side face connected with the radial end face; the second surrounding edge is inserted in the stepped structure, the end face of the second surrounding edge is abutted to the radial end face, and the circumferential outer side wall of the second surrounding edge is attached to the axial side face. The second surrounding edge can be completely or partially hidden in the step structure after being installed, and the blocking effect of the end face of the second surrounding edge on the airflow flowing to the check valve from the volute is reduced.

Description

Volute check valve assembly and range hood

Technical Field

The invention relates to the technical field of range hoods, in particular to a volute check valve assembly and a range hood.

Background

A range hood, which is generally installed on a wall above a cooking range, is a kitchen appliance for purifying a kitchen environment. The cooking device can quickly pump away oil smoke harmful to human bodies or waste gas generated after fuel combustion in the cooking process and discharge the oil smoke or the waste gas to the outside.

The lampblack absorber includes quick-witted case, spiral case and check valve, and the spiral case is installed at quick-witted incasement, has the smoke guide hole on the roof of machine case, and the air outlet of spiral case and the air intake of check valve all are connected with the roof of machine case to, form in the check valve the surrounding edge of air intake insert the spiral case in the surrounding edge that forms the air outlet to realize the intercommunication of spiral case and check valve.

When the range hood is used, oil smoke flows into the check valve from the volute, the oil smoke can be blocked by the end face of the surrounding edge of the check valve, the flow rate of the oil smoke is reduced, more blocked oil smoke can move along the gap between the volute and the check valve, and therefore the problem that the oil leakage amount of the gap between the volute and the check valve is increased is caused.

Disclosure of Invention

The invention aims to provide a volute check valve assembly and a range hood, and aims to solve the technical problem that the oil leakage amount of a gap at the joint of a volute and a check valve of the existing range hood is large.

In a first aspect, embodiments of the present invention provide a volute check valve assembly, comprising: a volute and a check valve, both of which have a first peripheral edge and a second peripheral edge; one of the first surrounding edge and the second surrounding edge is positioned on the volute and used for surrounding an air outlet of the volute, and the other one of the first surrounding edge and the second surrounding edge is positioned on the check valve and used for surrounding an air inlet of the check valve;

a step structure is arranged at the end part of the first surrounding edge, and comprises a radial end face connected with the inner side wall of the first surrounding edge and an axial side face connected with the radial end face;

the second surrounding edge is inserted in the stepped structure, the end face of the second surrounding edge is abutted to the radial end face, and the circumferential outer side wall of the second surrounding edge is attached to the axial side face.

Furthermore, a first blank holder extending outwards along the circumferential direction of the volute is arranged on the outer wall of the volute, a second blank holder extending outwards along the circumferential direction of the check valve is arranged on the outer wall of the check valve, and the first blank holder and the second blank holder are used for being respectively pressed on the upper side and the lower side of a top plate of the case; and an oil outlet of a gap formed between the second surrounding edge and the axial side face is positioned between the first pressing edge and the second pressing edge.

Further, the end connection of first surrounding edge has the annular chimb that extends to the outside along its circumference, the radial interior edge of annular chimb with the end connection of first surrounding edge, the radial outer edge of annular chimb is connected with the orientation the third surrounding edge that second surrounding edge one side extends, the inner wall of first surrounding edge, annular chimb towards the one side of second surrounding edge and the inner wall of third surrounding edge forms stair structure.

Further, the volute has a second peripheral edge, and the check valve has a first peripheral edge;

first press edges extending outwards along the circumferential direction of the check valve are arranged on the circumferential outer side of the volute at intervals, the first press edges are connected with the volute through a plurality of connecting pieces, one end of each connecting piece is connected with the corresponding first press edge towards the side wall of the volute, and the other end of each connecting piece is connected with the outer wall of the volute; and along the circumferential direction of the volute, a jack is formed by a gap between every two adjacent connecting pieces; the outer wall of the check valve is provided with a second blank holder which extends outwards along the circumferential direction of the check valve, and the first blank holder and the second blank holder are used for clamping a top plate of the case;

the end face of the third surrounding edge is provided with a plurality of notches, the notches correspond to the connecting pieces one by one, and the notches are used for avoiding the connecting pieces so that the third surrounding edge is inserted into the jack.

Furthermore, an oil leakage hole is formed in the first blank holder and vertically arranged, one end of the oil leakage hole is communicated with a gap between the first blank holder and the second blank holder, the other end of the oil leakage hole is communicated with the inside of the case, and the oil leakage hole is used for guiding oil into the case.

Furthermore, the number of the oil leakage holes is multiple, and the oil leakage holes are arranged around the volute.

Further, a sealing ring is pressed between the first pressing edge and the top plate.

Further, an annular limiting part protruding towards the first blank holder is arranged on the second blank holder, the annular limiting part is located on the outer side of the oil leakage hole, and the annular limiting part is abutted to the first blank holder;

the top plate and the sealing ring are located on the circumferential outer side of the annular limiting portion.

Furthermore, the annular inner wall of the sealing ring is in compression joint with the annular outer wall of the annular limiting part.

Further, the thickness value of the second surrounding edge is equal to the difference value of the inner diameter and the outer diameter of the annular convex edge.

Furthermore, the circumferential inner side wall of the second surrounding edge is in flush transition with the circumferential inner side wall of the first surrounding edge.

In a second aspect, the range hood provided by the embodiment of the invention comprises the volute check valve assembly.

The end of the first surrounding edge of the volute check valve component is provided with a stepped structure, and the stepped structure is used for accommodating the second surrounding edge. During installation, the second surrounding edge is inserted in the stepped structure, the end face of the second surrounding edge is abutted to the radial end face, a first gap extending along the radial direction of the first surrounding edge can be formed between the second surrounding edge and the radial end face, the circumferential outer side wall of the second surrounding edge is attached to the axial side face of the stepped structure, a second gap parallel to the axial direction of the second surrounding edge can be formed between the second surrounding edge and the axial side face of the stepped structure, and the vertical cross-sectional shapes of the first gap and the second gap are approximately L-shaped. The second surrounding edge can be completely or partially hidden in the ladder structure after being installed, the airflow flowing to the check valve from the volute is reduced by the blocking effect of the end face of the second surrounding edge, the oil smoke is not easy to be detained at the end position of the second surrounding edge, and then the smoke is reduced to enter into the gap between the volute and the check valve. And the contact surface of spiral case and check valve is changed into L type contact by conventional plane contact, and wherein, the first gap that radial terminal surface and the terminal surface butt of second surrounding edge formed can be with the flow direction of air current be the contained angle or set up perpendicularly, and the degree of difficulty that the air current passed the gap between spiral case and the check valve increases, and then reduces the overflow volume of the gap between flue gas follow spiral case and the check valve.

The range hood provided by the embodiment of the invention comprises the volute check valve component. Because the range hood provided by the embodiment of the invention adopts the volute check valve component, the range hood provided by the embodiment of the invention also has the advantages of the volute check valve component.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Figure 1 is a schematic view of a volute check valve assembly provided by embodiment 1 of the present invention;

FIG. 2 is an enlarged view of a portion of the portion A of FIG. 1;

figure 3 is a schematic view of the volute check valve assembly provided in embodiment 1 of the present invention;

FIG. 4 is a schematic view of the gas flow path of the volute check valve assembly provided in embodiment 1 of the present invention;

FIG. 5 is a schematic view of an alternative connection of the volute and check valve of the volute check valve assembly provided in embodiment 1 of the present invention;

figure 6 is a schematic view of a range hood with a volute check valve assembly provided in embodiment 2 of the present invention;

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at position D;

FIG. 9 is a cross-sectional view taken along line C-C of FIG. 6;

FIG. 10 is an enlarged view of a portion of FIG. 9 at position E;

figure 11 is a schematic view of a first hold-down of a volute check valve assembly provided in accordance with embodiment 2 of the present invention;

figure 12 is a schematic view of the check valve of the volute check valve assembly provided in embodiment 2 of the present invention.

Icon: 100-a volute; 200-a check valve; 310-a first peripheral edge; 320-a second peripheral edge; 330-third surrounding edge; 340-an annular rim; 410-first pressing edge; 411-oil leakage holes; 420-second blank holder; 421-an annular limiting part; 500-a chassis; 510-a top plate; 600-sealing ring; 710-route 0; 720-route 1; 730-route 2; 800-a connector; 900-notch.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-4, an embodiment of the present invention provides a volute check valve assembly comprising: a volute 100 and a check valve 200, both of the volute 100 and the check valve 200 having a first peripheral edge 310 and a second peripheral edge 320; of the first and second peripheral edges 310 and 320, one of the first and second peripheral edges on the scroll casing 100 is used for enclosing an air outlet of the scroll casing 100, and the other one of the first and second peripheral edges on the check valve 200 is used for enclosing an air inlet of the check valve 200; after the first surrounding edge 310 and the second surrounding edge 320 are butted, the conduction between the air outlet of the scroll casing 100 and the air inlet of the check valve 200 is realized.

A stepped structure is arranged at the end part of the first surrounding edge 310, and comprises a radial end face connected with the inner side wall of the first surrounding edge 310 and an axial side face connected with the radial end face; during installation, the second surrounding edge 320 is inserted into the stepped structure, the end face of the second surrounding edge 320 is abutted to the radial end face, a first gap extending along the radial direction of the first surrounding edge 310 can be formed between the second surrounding edge and the radial end face, the circumferential outer side wall of the second surrounding edge 320 is attached to the axial side face of the stepped structure, a second gap parallel to the axial direction of the second surrounding edge 320 can be formed between the second surrounding edge and the axial side face of the stepped structure, and the vertical cross-sectional shapes of the first gap and the second gap are approximately L-shaped.

As shown in fig. 2, in the present scheme, an end of the first surrounding edge 310 is connected with an annular convex edge 340 extending outward along the circumferential direction thereof, one surface of the annular convex edge 340 facing the second surrounding edge 320 forms the radial end surface, the annular convex edge 340 and the first surrounding edge 310 are arranged at an included angle, and the included angle therebetween may be 60 °, 90 °, or 120 °.

The radial interior edge of annular chimb 340 with the end connection of first surrounding edge 310, the radial outer edge of annular chimb 340 is connected with court the third surrounding edge 330 that second surrounding edge 320 one side extended, the circumference inner wall of third surrounding edge 330 forms the axial side, the inner wall of first surrounding edge 310, annular chimb 340 towards the one side of second surrounding edge 320 and the inner wall of third surrounding edge 330 forms stair structure. Since the annular rim 340 extends toward the circumferential outer side of the first peripheral edge 310, the cross-sectional area of the third peripheral edge 330 connected to the radially outer edge of the annular rim 340 is larger than the cross-sectional area of the first peripheral edge 310, and when the cross-sectional shapes of the first peripheral edge 310, the second peripheral edge 320, and the third peripheral edge 330 are uniform circular ring shapes, the inner diameter of the third peripheral edge 330 is larger than the inner diameter of the first peripheral edge 310.

The second surrounding edge 320 is inserted into the stepped structure, the end surface of the second surrounding edge 320 abuts against the annular convex edge 340, and the circumferential outer side wall of the second surrounding edge 320 is attached to the circumferential inner side wall of the third surrounding edge 330.

The inclination direction of the end surface of the second peripheral edge 320 is the same as the inclination direction of the annular convex edge 340 towards the surface of the second peripheral edge 320, so that the gap between the abutting surfaces of the second peripheral edge 320 and the annular convex edge 340 can be minimized when the two abutting surfaces abut.

The end connection of first surrounding edge 310 has the annular chimb 340 that extends to the outside of week, and the radial outer edge of annular chimb 340 is connected with third surrounding edge 330, and the cross-sectional area of third surrounding edge 330 is greater than the cross-sectional area of first surrounding edge 310, the one side of the inner wall of first surrounding edge 310, annular chimb 340 towards second surrounding edge 320 and the inner wall of third surrounding edge 330 forms the stair structure, and the stair structure is used for holding second surrounding edge 320. During installation, the second surrounding edge 320 is inserted into the stepped structure, the end face of the second surrounding edge 320 abuts against the annular convex edge 340, a first gap extending along the radial direction of the first surrounding edge 310 can be formed between the second surrounding edge and the annular convex edge, the circumferential outer side wall of the second surrounding edge 320 is attached to the circumferential inner side wall of the third surrounding edge 330, a second gap parallel to the axial direction of the second surrounding edge 320 can be formed between the second surrounding edge and the annular convex edge, and the vertical cross-sectional shapes of the first gap and the second gap are approximately L-shaped. The second surrounding edge 320 can be completely or partially hidden in the stepped structure after being installed, the blocking effect of the end face of the second surrounding edge 320 on the airflow flowing to the check valve 200 from the volute 100 is reduced, oil smoke is not easy to be detained at the end position of the second surrounding edge 320, and then the smoke is reduced from entering a gap between the volute 100 and the check valve 200. Moreover, the contact surface between the volute 100 and the check valve 200 is changed from a conventional planar contact to an L-shaped contact, wherein a first gap formed by the abutting of the annular convex edge 340 and the end surface of the second peripheral edge 320 may form an included angle or be perpendicular to the flow direction of the airflow, the difficulty of the airflow passing through the gap between the volute 100 and the check valve 200 is increased, and the overflow amount of the flue gas from the gap between the volute 100 and the check valve 200 is further reduced.

In a first possible embodiment, the volute 100 has a first peripheral edge 310 and the check valve 200 has a second peripheral edge 320. The third surrounding edge 330 is located above the first surrounding edge 310, and during installation, the second surrounding edge 320 is inserted into the third surrounding edge 330 from top to bottom, wherein the first gap is located below the second gap, and the vertical contact surface on the second gap enables oil to flow in the antigravity direction to overflow, so that the difficulty is increased.

In a second possible embodiment, the volute 100 has a second peripheral edge 320 and the check valve 200 has a first peripheral edge 310. The third surrounding edge 330 is located below the first surrounding edge 310, and when the device is installed, the second surrounding edge 320 is inserted into the third surrounding edge 330 from bottom to top, wherein the first gap is located above the second gap.

For convenience of description of the structure of the product, the following description will be given by taking as an example a product in which the scroll casing 100 has the first peripheral edge 310 and the check valve 200 has the second peripheral edge 320.

A first blank holder 410 extending outwards along the circumferential direction of the volute 100 is arranged on the outer wall of the volute, a second blank holder 420 extending outwards along the circumferential direction of the check valve 200 is arranged on the outer wall of the check valve, and the first blank holder 410 and the second blank holder 420 are respectively crimped on the upper side and the lower side of a top plate 510 of the case 500; and the oil outlet of the gap formed by the second surrounding edge 320 and the third surrounding edge 330 is positioned between the first pressing edge 410 and the second pressing edge 420.

The top plate 510 of the case 500 is pressed between the first pressing edge 410 and the second pressing edge 420, and the oil outlet of the gap formed by the second surrounding edge 320 and the third surrounding edge 330 is also positioned between the first pressing edge 410 and the second pressing edge 420, and after the smoke overflow amount between the scroll 100 and the check valve 200 is reduced, the amount of oil overflowing between the first pressing edge and the second smoke plate is reduced. Because the scroll 100 is located below the check valve 200, a portion of the soot overflowing between the first binder 410 and the second binder 420 flows back into the cabinet 500 through the gap between the top plate 510 and the first binder 410, further reducing the amount of oil overflowing from the gap between the top plate 510 and the second binder to above the top plate 510.

Mounting holes can be formed in the corresponding positions of the first pressing edge 410, the top plate 510, the sealing ring 600 and the second pressing edge 420, and the first pressing edge 410, the top plate 510, the sealing ring 600 and the second pressing edge 420 are locked by screws to realize vertical fixation.

An oil leakage hole 411 is vertically arranged on the first blank holder 410, one end of the oil leakage hole 411 is communicated with a gap between the first blank holder 410 and the second blank holder 420, the other end of the oil leakage hole 411 is communicated with the inside of the case 500, and the oil leakage hole 411 is used for guiding oil into the case 500.

On the one hand, the oil entering between the first pressing edge 410 and the second pressing edge 420 can flow back into the case 500 through the oil leakage hole 411, and then is collected by the oil collecting structure in the case 500. On the other hand, the oil leakage hole 411 has a pressure relief function, oil smoke enters the area between the first pressing edge 410 and the second pressing edge 420 along the matching gap between the scroll casing 100 and the check valve 200, the pressure of the air flow is relieved by the oil leakage hole 411, the air flow loses the pressure drive inside the scroll casing 100, the oil smoke loses the maximum power for continuing to move forward, and the oil quantity overflowing to the upper side of the top plate 510 from the gap between the top plate 510 and the second pressing edge 420 is further reduced.

The number of the oil leakage holes 411 may be plural, the plural oil leakage holes 411 are disposed around the scroll casing 100, and the plural oil leakage holes 411 may guide the liquid oil formed at each position back to the casing 500 in time.

A sealing ring 600 is pressed between the first pressing edge 410 and the top plate 510.

The seal ring 600 may be press-fitted between the first pressing edge 410 and the top plate 510, and by providing the seal ring 600, a gap between the first pressing edge 410 and the top plate 510 may be reduced, thereby reducing the outflow of liquid oil from between the first pressing edge 410 and the top plate 510.

In this embodiment, the sealing ring 600 is pressed between the top plate 510 and the first pressing edge 410, and the sealing ring 600 is disposed below the top plate 510, so that the height of the top plate 510 relative to the first pressing edge 410 can be increased, the upward movement of oil against gravity is made more difficult, and the amount of oil overflowing from the gap between the top plate 510 and the second pressing edge 420 to the top of the top plate 510 is reduced.

The second pressing edge 420 is provided with an annular limiting portion 421 protruding towards the first pressing edge 410, the annular limiting portion 421 is located at the outer side of the oil leakage hole 411, and the annular limiting portion 421 abuts against the first pressing edge 410; the top plate 510 and the seal ring 600 are located on the circumferential outer side of the annular stopper 421.

The annular limiting portion 421 extends from top to bottom, and the annular limiting portion 421 acts as a barrier to the oil smoke moving in the transverse direction, and when the oil smoke passes through the annular limiting portion 421, the oil smoke is not easy to move upwards against the gravity direction and flows out from the gap between the first pressing edge 410 and the top plate 510.

The annular inner wall of the seal ring 600 is in compression joint with the annular outer wall of the annular limiting portion 421. The sealing ring 600 is tightened on the outer annular wall of the annular stopper 421 to prevent oil from moving upward after passing over the annular stopper 421. Meanwhile, excessive compression of the sealing gasket or no compression is avoided, and the service life of the sealing ring 600 is prolonged.

As shown in fig. 4, if some oil passes through the gap between the annular limiting portion 421 of the check valve 200 and the first pressing edge 410 of the scroll casing 100 and continues to the end of the first pressing edge 410 of the scroll casing 100 along the 1 st path 720 after a long time of operation, the oil also flows back into the casing 500, thereby avoiding the risk of oil leakage.

As shown in fig. 4, after passing through the gaps of the 0 th route 710 and the 1 st route 720, the oil enters the gap of the 2 nd route 730, that is, along: the vertical gap between the annular limiting portion 421 and the sealing ring 600, the vertical gap between the annular limiting portion 421 and the top plate 510, and the horizontal gap between the second pressing edge 420 and the top plate 510 can reach the upper surface of the top plate 510, and oil leakage occurs. The 2 nd route 730 has a very low probability of going through because there is no significant pressure in the volute 100 after the oil enters the enclosed area of the check valve 200 and the volute 100 through the 0 th route 710 and there is no power for the oil to follow further the 1 st route 720 and the 2 nd route 730. Route 2 730 also requires the oil to go upwards in the opposite direction of gravity. Therefore, the oil leakage amount of the top plate 510 of the range hood of the scheme is less.

The thickness of the second peripheral edge 320 is equal to the difference between the inner diameter and the outer diameter of the annular convex edge 340.

The second surrounding edge 320 can be just clamped in the stepped structure, the transition between the second surrounding edge 320 and the third surrounding edge 330 is smoother, when the airflow flows along the circumferential inner side wall of the second surrounding edge 320 towards the direction of the first surrounding edge 310, the transition from the circumferential inner side wall of the second surrounding edge 320 to the inner side wall of the first surrounding edge 310 can be free of obstacles, the airflow is less obstructed, the reduction of the flow rate is less, and the airflow rapidly passes through the gap between the volute 100 and the check valve 200, so that the amount of smoke entering the gap between the volute 100 and the check valve 200 is reduced.

As shown in fig. 5, the circumferential inner side wall of the second peripheral edge 320 transitions flush with the circumferential inner side wall of the first peripheral edge 310.

At the transition position between the first surrounding edge 310 and the second surrounding edge 320, the inner side walls of the first surrounding edge 310 and the second surrounding edge 320 are flush, specifically, the annular convex edge 340 may be perpendicular to the first surrounding edge 310 and the third surrounding edge 330, respectively, the thickness of the second surrounding edge 320 is equal to the difference between the inner diameter and the outer diameter of the annular convex edge 340, and the airflow is less resistant when flowing.

Example 2

As shown in fig. 6-12, in the present embodiment, the volute 100 has a second peripheral edge 320 and the check valve 200 has a first peripheral edge 310. The third surrounding edge 330 is located below the first surrounding edge 310, and when the device is installed, the second surrounding edge 320 is inserted into the third surrounding edge 330 from bottom to top, wherein the first gap is located above the second gap. As shown in fig. 10, the difference from embodiment 1 is that first pressing edges 410 extending outward in the circumferential direction of the check valve 200 are spaced apart from each other on the circumferential outer side of the scroll casing 100, that is, a gap is formed between the first pressing edges 410 and the outer wall of the scroll casing 100, and the first pressing edges 410 and the outer wall of the scroll casing 100 are connected together by a connecting member 800, one end of the connecting member 800 is connected to the first pressing edge 410 toward the side wall of the scroll casing 100, and the other end is connected to the outer wall of the scroll casing 100. Along the circumferential direction of the volute 100, the gap between two adjacent connectors 800 forms a jack; a second blank holder 420 extending outwards along the circumferential direction of the check valve 200 is arranged on the outer wall of the check valve 200, and the first blank holder 410 and the second blank holder 420 are used for holding a top plate 510 of the case 500; as shown in fig. 12, a plurality of notches 900 are provided on an end surface of the third surrounding edge 330, the number and the shape of the notches 900 correspond to those of the connecting pieces 800 one by one, and the notches 900 are used for avoiding the connecting pieces 800, so that the third surrounding edge 330 is inserted into the jack. The third surrounding edge 330 passes through the first pressing edge 410, so that the oil outlet of the second gap formed between the annular inner side wall of the third surrounding edge 330 and the annular outer side wall of the second surrounding edge 320 is directly positioned in the machine case 500, and the oil flowing out of the oil outlet directly enters the machine case 500.

As shown in fig. 11, the connection member 800 may be a cylinder with a rectangular cross section, and the connection member 800 is connected to the first and second pressing edges 410 and 420 by welding, or the first pressing edge 410 and the outer wall of the scroll casing 100 are integrally formed, and then a plurality of through holes are punched, the plurality of through holes are arranged along the circumferential direction, and the remaining portion between two adjacent through holes forms the connection member 800.

An interference fit may be employed between the third peripheral edge 330 and the receptacle.

The range hood provided by the embodiment of the invention comprises the volute check valve component. Because the range hood provided by the embodiment of the invention adopts the volute check valve component, the range hood provided by the embodiment of the invention also has the advantages of the volute check valve component.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A volute check valve assembly, comprising: a volute (100) and a check valve (200), both of the volute (100) and the check valve (200) having a first peripheral edge (310) and a second peripheral edge (320); of the first surrounding edge (310) and the second surrounding edge (320), one of the first surrounding edge and the second surrounding edge is positioned on the volute (100) and used for surrounding an air outlet of the volute (100), and the other one of the first surrounding edge and the second surrounding edge is positioned on the check valve (200) and used for surrounding an air inlet of the check valve (200);

a step structure is arranged at the end part of the first surrounding edge (310), and comprises a radial end face connected with the inner side wall of the first surrounding edge (310) and an axial side face connected with the radial end face;

the second surrounding edge (320) is inserted into the stepped structure, the end face of the second surrounding edge (320) is abutted to the radial end face, and the circumferential outer side wall of the second surrounding edge (320) is attached to the axial side face.

2. The volute check valve assembly of claim 1, wherein the volute (100) is provided with a first pressing edge (410) extending outwards along the circumferential direction thereof on the outer wall thereof, the check valve (200) is provided with a second pressing edge (420) extending outwards along the circumferential direction thereof on the outer wall thereof, and the first pressing edge (410) and the second pressing edge (420) are respectively pressed on the upper side and the lower side of a top plate (510) of a case (500); and an oil outlet of a gap formed by the second surrounding edge (320) and the axial side surface is positioned between the first pressing edge (410) and the second pressing edge (420).

3. The volute check valve assembly of claim 1, wherein an annular rim (340) extending circumferentially outward of the first peripheral edge (310) is connected to an end of the first peripheral edge (310), a radially inner edge of the annular rim (340) is connected to an end of the first peripheral edge (310), a radially outer edge of the annular rim (340) is connected to a third peripheral edge (330) extending toward a side of the second peripheral edge (320), and an inner wall of the first peripheral edge (310), a face of the annular rim (340) toward the second peripheral edge (320), and an inner wall of the third peripheral edge (330) form the stepped structure.

4. The volute check valve assembly of claim 3, wherein the volute (100) has a second peripheral edge (320), the check valve (200) has a first peripheral edge (310);

first pressing edges (410) extending outwards along the circumferential direction of the check valve (200) are arranged on the circumferential outer side of the volute (100) at intervals, the first pressing edges (410) are connected with the volute (100) through a plurality of connecting pieces (800), one end of each connecting piece (800) is connected with the side wall, facing the volute (100), of each first pressing edge (410), and the other end of each connecting piece is connected with the outer wall of the volute (100); and along the circumferential direction of the volute (100), a gap between two adjacent connecting pieces (800) forms a jack; a second blank holder (420) extending outwards along the circumferential direction of the check valve (200) is arranged on the outer wall of the check valve, and the first blank holder (410) and the second blank holder (420) are used for clamping a top plate (510) of the case (500);

the end face of the third surrounding edge (330) is provided with a plurality of notches (900), the notches (900) correspond to the connecting pieces (800) one by one, and the notches (900) are used for avoiding the connecting pieces (800) so that the third surrounding edge (330) is inserted into the jack.

5. The volute check valve assembly according to claim 2 or 4, wherein the first binder (410) is provided with an oil leakage hole (411) vertically disposed, one end of the oil leakage hole (411) communicates with a gap between the first binder (410) and the second binder (420), the other end of the oil leakage hole (411) communicates with an inside of the case (500), and the oil leakage hole (411) is used for guiding oil into the case (500).

6. The volute check valve assembly of claim 5, wherein the number of oil leak holes (411) is plural, and a plurality of oil leak holes (411) are provided around the volute (100).

7. The volute check valve assembly of claim 2 or 4, wherein a seal ring (600) is crimped between the first binder (410) and the top plate (510).

8. The volute check valve assembly of claim 7, wherein the second binder (420) has an annular stopper portion (421) protruding toward the first binder (410), the annular stopper portion (421) being located outside the oil leak hole (411), the annular stopper portion (421) abutting the first binder (410);

the top plate (510) and the sealing ring (600) are located on the circumferential outer side of the annular limiting portion (421).

9. The volute check valve assembly of claim 8, wherein an annular inner wall of the seal ring (600) is crimped with an annular outer wall of the annular retainer (421).

10. The volute check valve assembly of claim 1, wherein the thickness of the second peripheral edge (320) has a value equal to a difference between an inner diameter and an outer diameter of the annular rim (340).

11. The volute check valve assembly of claim 10, wherein a circumferential inner sidewall of the second peripheral edge (320) transitions flush with a circumferential inner sidewall of the first peripheral edge (310).

12. A range hood, characterized in that it comprises a volute check valve assembly according to any of claims 1-11.

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