Volute check valve assembly and range hood

Abstract

The present invention provides a volute check valve assembly and a range hood, and relates to the technical field of range hoods. The volute check valve assembly comprises: a volute and a check valve, wherein one of the volute and the check valve has a first peripheral edge, and the other has a second peripheral edge; a step structure is provided at the end of the first peripheral edge, and the step structure comprises a radial end face connected to the inner side wall of the first peripheral edge and an axial side face connected to the radial end face; the second peripheral edge is inserted into the step structure, and the end face of the second peripheral edge abuts against the radial end face, and the circumferential outer side wall of the second peripheral edge fits against the axial side face. After the second peripheral edge is installed, it can be completely or partially hidden in the step structure, and the airflow from the volute to the check valve is reduced in blocking effect by the end face of the second peripheral edge.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a volute check valve assembly and a range hood. Background Art

[0002] A range hood is usually installed on the wall above the stove. It is a kitchen appliance that purifies the kitchen environment. It quickly removes the harmful fumes or waste gas from fuel combustion produced during the cooking process and discharges them outdoors.

[0003] The range hood includes a chassis, a volute and a check valve. The volute is installed in the chassis. A smoke guide hole is provided on the top plate of the chassis. The air outlet of the volute and the air inlet of the check valve are both connected to the top plate of the chassis. Moreover, the surrounding edge forming the air inlet in the check valve is inserted into the surrounding edge forming the air outlet in the volute, thereby realizing the connection between the volute and the check valve.

[0004] When the range hood is in use, when the oil smoke flows from the volute into the check valve, the oil smoke will be blocked by the end face of the surrounding edge of the check valve, thereby reducing the flow rate of the oil smoke. More of the blocked oil smoke will move along the gap between the volute and the check valve, causing an increase in the amount of oil seepage in the gap between the volute and the check valve. Summary of the invention

[0005] The object of the present invention is to provide a volute check valve assembly and a range hood, so as to alleviate the technical problem of large oil leakage in the gap at the joint between the volute and the check valve of the existing range hood.

[0006] In a first aspect, an embodiment of the present invention provides a volute check valve assembly, the volute check valve assembly comprising: a volute and a check valve, wherein one of the volute and the check valve has a first surrounding edge, and the other has a second surrounding edge; of the first surrounding edge and the second surrounding edge, one located on the volute is used to surround an air outlet of the volute, and the other located on the check valve is used to surround an air inlet of the check valve;

[0007] The end of the first surrounding edge is provided with a step structure, and the step structure includes a radial end surface connected to the inner side wall of the first surrounding edge and an axial side surface connected to the radial end surface;

[0008] The second surrounding edge is inserted into the stepped structure, and the end surface of the second surrounding edge abuts against the radial end surface, and the circumferential outer side wall of the second surrounding edge fits against the axial side surface.

[0009] Furthermore, a first pressure edge extending outward along its circumference is provided on the outer wall of the volute, and a second pressure edge extending outward along its circumference is provided on the outer wall of the check valve, and the first pressure edge and the second pressure edge are used to be crimped on the upper and lower sides of the top plate of the chassis respectively; and the oil outlet of the gap formed by the second surrounding edge and the axial side surface is located between the first pressure edge and the second pressure edge.

[0010] Furthermore, the end of the first surrounding edge is connected to an annular flange extending outward along its circumference, the radial inner edge of the annular flange is connected to the end of the first surrounding edge, the radial outer edge of the annular flange is connected to a third surrounding edge extending toward the second surrounding edge, and the inner wall of the first surrounding edge, the side of the annular flange facing the second surrounding edge, and the inner wall of the third surrounding edge form the stepped structure.

[0011] Further, the volute has a second surrounding edge, and the check valve has a first surrounding edge;

[0012] The circumferential outer side of the volute is provided with a first pressure edge extending outwardly along the circumferential direction of the check valve at intervals, the first pressure edge and the volute are connected by a plurality of connecting pieces, one end of the connecting piece is connected to the side wall of the volute facing the first pressure edge, and the other end is connected to the outer wall of the volute; and along the circumference of the volute, the gap between two adjacent connecting pieces forms a plug hole; the outer wall of the check valve is provided with a second pressure edge extending outwardly along its circumference, the first pressure edge and the second pressure edge are used to clamp the top plate of the chassis;

[0013] A plurality of notches are arranged on the end surface of the third surrounding edge, and the notches correspond to the connecting members one by one. The notches are used to avoid the connecting members so that the third surrounding edge can be inserted into the insertion hole.

[0014] Furthermore, the first pressing edge is provided with an oil leakage hole arranged vertically, one end of the oil leakage hole is connected to the gap between the first pressing edge and the second pressing edge, and the other end of the oil leakage hole is connected to the inside of the chassis, and the oil leakage hole is used to introduce oil into the chassis.

[0015] Furthermore, there are multiple oil leakage holes, and the multiple oil leakage holes are arranged around the volute.

[0016] Furthermore, a sealing ring is crimped between the first pressing edge and the top plate.

[0017] Furthermore, the second pressing edge is provided with an annular limiting portion protruding toward the first pressing edge, the annular limiting portion is located outside the oil leakage hole, and the annular limiting portion abuts against the first pressing edge;

[0018] The top plate and the sealing ring are located on the circumferential outer side of the annular limiting portion.

[0019] Furthermore, the annular inner wall of the sealing ring is crimped to the annular outer wall of the annular limiting portion.

[0020] Furthermore, the thickness of the second surrounding edge is equal to the difference between the inner and outer diameters of the annular convex edge.

[0021] Furthermore, the circumferential inner side wall of the second surrounding edge transitions flush with the circumferential inner side wall of the first surrounding edge.

[0022] In a second aspect, an embodiment of the present invention provides a range hood, wherein the range hood comprises the above-mentioned volute check valve assembly.

[0023] The end of the first surrounding edge of the volute check valve assembly provided in the embodiment of the present invention is provided with a stepped structure, and the stepped structure is used to accommodate the second surrounding edge. During installation, the second surrounding edge is inserted into the stepped structure, and the end face of the second surrounding edge abuts against the radial end face, and a first gap extending along the radial direction of the first surrounding edge can be formed between the two, and the circumferential outer side wall of the second surrounding edge fits with the axial side face of the stepped structure, and a second gap parallel to the axial direction of the second surrounding edge can be formed between the two, and the vertical cross-sectional shape of the first gap and the second gap is approximately "L"-shaped. After installation, the second surrounding edge can be completely or partially hidden in the stepped structure, and the airflow from the volute to the check valve is blocked by the end face of the second surrounding edge, and the oil smoke is not easy to be retained at the end position of the second surrounding edge, thereby reducing the smoke from entering the gap between the volute and the check valve. Furthermore, the contact surface between the volute and the check valve is transformed from a conventional planar contact to an L-shaped contact, wherein a first gap formed by the abutment of the radial end face with the end face of the second surrounding edge can be arranged at an angle to or perpendicular to the flow direction of the airflow, thereby increasing the difficulty of the airflow passing through the gap between the volute and the check valve, thereby reducing the amount of smoke overflowing from the gap between the volute and the check valve.

[0024] The range hood provided by the embodiment of the present invention includes the above-mentioned volute check valve assembly. Since the range hood provided by the embodiment of the present invention uses the above-mentioned volute check valve assembly, the range hood provided by the embodiment of the present invention also has the advantages of the volute check valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a volute check valve assembly provided in Example 1 of the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged view of position A in the middle;

[0028] Figure 3 A schematic diagram of a volute of a volute check valve assembly provided in Example 1 of the present invention;

[0029] Figure 4 A schematic diagram of the airflow route of the volute check valve assembly provided in Example 1 of the present invention;

[0030] Figure 5 A schematic diagram of another connection method between the volute and the check valve of the volute check valve assembly provided in Example 1 of the present invention;

[0031] Figure 6 A schematic diagram of a range hood with a volute check valve assembly provided in Example 2 of the present invention;

[0032] Figure 7 for Figure 6 Cross-sectional view in the BB direction;

[0033] Figure 8 for Figure 7 A partial enlarged view of the D position in the middle;

[0034] Fig. 9 for Figure 6 Cross-sectional view in CC direction;

[0035] Fig.10 for Fig. 9 A partial enlarged view of the E position in the middle;

[0036] Fig.11 A schematic diagram of a first pressing edge of a volute check valve assembly provided in Example 2 of the present invention;

[0037] Fig.12 A schematic diagram of a check valve of a volute check valve assembly provided in Example 2 of the present invention.

[0038] Icons: 100-volute; 200-check valve; 310-first surrounding edge; 320-second surrounding edge; 330-third surrounding edge; 340-annular convex edge; 410-first pressure edge; 411-oil leakage hole; 420-second pressure edge; 421-annular limiting portion; 500-chassis; 510-top plate; 600-sealing ring; 710-0th route; 720-1st route; 730-2nd route; 800-connecting piece; 900-notch. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1-Figure 4 As shown, the volute check valve assembly provided by the embodiment of the present invention includes: a volute 100 and a check valve 200, wherein one of the volute 100 and the check valve 200 has a first surrounding edge 310, and the other has a second surrounding edge 320; of the first surrounding edge 310 and the second surrounding edge 320, the one located on the volute 100 is used to enclose the air outlet of the volute 100, and the other located on the check valve 200 is used to enclose the air inlet of the check valve 200; after the first surrounding edge 310 and the second surrounding edge 320 are connected, the air outlet of the volute 100 and the air inlet of the check valve 200 are connected.

[0042] A step structure is provided at the end of the first surround 310, and the step structure includes a radial end face connected to the inner side wall of the first surround 310 and an axial side face connected to the radial end face; when installed, the second surround 320 is inserted into the step structure, and the end face of the second surround 320 abuts against the radial end face, and a first gap extending along the radial direction of the first surround 310 can be formed therebetween, and the circumferential outer side wall of the second surround 320 fits against the axial side face of the step structure, and a second gap parallel to the axial direction of the second surround 320 can be formed therebetween, and the vertical cross-sectional shape of the first gap and the second gap is approximately "L"-shaped.

[0043] like Figure 2 As shown, in this embodiment, the end of the first surrounding edge 310 is connected to an annular flange 340 extending outward along its circumference, and the annular flange 340 forms the radial end face on one side facing the second surrounding edge 320. The annular flange 340 is arranged at an angle to the first surrounding edge 310, and the angle between the two can be 60°, 90° or 120°, etc.

[0044] The radial inner edge of the annular convex edge 340 is connected to the end of the first surrounding edge 310, and the radial outer edge of the annular convex edge 340 is connected to the third surrounding edge 330 extending toward the second surrounding edge 320. The circumferential inner wall of the third surrounding edge 330 forms the axial side surface, and the inner wall of the first surrounding edge 310, the side of the annular convex edge 340 facing the second surrounding edge 320, and the inner wall of the third surrounding edge 330 form a stepped structure. Because the annular convex edge 340 extends toward the circumferential outer side of the first surrounding edge 310, the cross-sectional area of ​​the third surrounding edge 330 connected to the radial outer edge of the annular convex edge 340 is larger than the cross-sectional area of ​​the first surrounding edge 310. When the cross-sectional shapes of the first surrounding edge 310, the second surrounding edge 320, and the third surrounding edge 330 are uniformly circular, the inner diameter of the third surrounding edge 330 is larger than the inner diameter of the first surrounding edge 310.

[0045] The second surrounding edge 320 is inserted into the stepped structure, and 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 fits with the circumferential inner side wall of the third surrounding edge 330 .

[0046] The inclination direction of the end surface of the second surrounding edge 320 is the same as the inclination direction of the surface of the annular flange 340 facing the second surrounding edge 320 , so that when the second surrounding edge 320 and the annular flange 340 abut, the gap between the abutting surfaces can be minimized.

[0047] The end of the first surrounding edge 310 is connected to an annular flange 340 extending outward in the circumferential direction, and the radial outer edge of the annular flange 340 is connected to the third surrounding edge 330. The cross-sectional area of ​​the third surrounding edge 330 is greater than the cross-sectional area of ​​the first surrounding edge 310. The inner wall of the first surrounding edge 310, the side of the annular flange 340 facing the second surrounding edge 320, and the inner wall of the third surrounding edge 330 form a stepped structure, and the stepped structure is used to accommodate the second surrounding edge 320. During installation, the second surrounding edge 320 is inserted into the stepped structure, and the end face of the second surrounding edge 320 abuts against the annular flange 340, and a first gap extending along the radial direction of the first surrounding edge 310 can be formed between the two. The circumferential outer side wall of the second surrounding edge 320 is abutted against the circumferential inner side wall of the third surrounding edge 330, and a second gap parallel to the axial direction of the second surrounding edge 320 can be formed between the two. The vertical cross-sectional shape of the first gap and the second gap is approximately "L"-shaped. After installation, the second surrounding edge 320 can be completely or partially hidden in the stepped structure, and the airflow from the volute 100 to the check valve 200 is blocked by the end face of the second surrounding edge 320, so that the smoke is not easily retained at the end position of the second surrounding edge 320, thereby reducing the smoke from entering the gap between the volute 100 and the check valve 200. In addition, the contact surface between the volute 100 and the check valve 200 is changed from a conventional plane contact to an L-shaped contact, wherein the first gap formed by the abutment of the annular convex edge 340 and the end face of the second surrounding edge 320 can be set at an angle or perpendicular to the flow direction of the airflow, and the difficulty of the airflow passing through the gap between the volute 100 and the check valve 200 is increased, thereby reducing the amount of smoke overflowing from the gap between the volute 100 and the check valve 200.

[0048] In a first feasible solution, the volute 100 has a first surround 310, and the check valve 200 has a second surround 320. The third surround 330 is located above the first surround 310. During installation, the second surround 320 is inserted into the third surround 330 from top to bottom, wherein the first gap is located below the second gap, and the vertical contact surface on the second gap requires the oil to flow in the direction against gravity to overflow, which makes it more difficult.

[0049] In a second feasible solution, the volute 100 has a second surround 320, and the check valve 200 has a first surround 310. The third surround 330 is located below the first surround 310, and during installation, the second surround 320 is inserted into the third surround 330 from bottom to top, wherein the first gap is located above the second gap.

[0050] In order to facilitate the description of the structure of the product, the following description takes the product in which the volute 100 has a first surrounding edge 310 and the check valve 200 has a second surrounding edge 320 as an example.

[0051] The outer wall of the volute 100 is provided with a first pressure edge 410 extending outward along its circumference, and the outer wall of the check valve 200 is provided with a second pressure edge 420 extending outward along its circumference, and the first pressure edge 410 and the second pressure edge 420 are used to be crimped on the upper and lower sides of the top plate 510 of the chassis 500 respectively; and the oil outlet of the gap formed by the second surrounding edge 320 and the third surrounding edge 330 is located between the first pressure edge 410 and the second pressure edge 420.

[0052] The top plate 510 of the chassis 500 is crimped between the first edge 410 and the second edge 420, and the oil outlet of the gap formed by the second edge 320 and the third edge 330 is also located between the first edge 410 and the second edge 420. After the amount of smoke overflow between the volute 100 and the check valve 200 is reduced, the amount of oil overflowing between the first edge 410 and the second smoke plate is reduced. Because the volute 100 is located below the check valve 200, part of the oil smoke overflowing between the first edge 410 and the second edge 420 will flow back into the chassis 500 through the gap between the top plate 510 and the first edge 410, further reducing the amount of oil overflowing from the gap between the top plate 510 and the second edge to the top of the top plate 510.

[0053] Mounting holes may be provided at corresponding positions of the first clamping edge 410 , the top plate 510 , the sealing ring 600 , and the second clamping edge 420 , and the first clamping edge 410 , the top plate 510 , the sealing ring 600 , and the second clamping edge 420 may be fastened by screws to achieve upper and lower fixation.

[0054] The first pressing edge 410 is provided with an oil leakage hole 411 arranged vertically, one end of the oil leakage hole 411 is connected to the gap between the first pressing edge 410 and the second pressing edge 420, and the other end of the oil leakage hole 411 is connected to the inside of the chassis 500. The oil leakage hole 411 is used to introduce oil into the chassis 500.

[0055] On the one hand, the oil entering between the first pressure edge 410 and the second pressure edge 420 can flow back into the chassis 500 through the oil leakage hole 411, and then be collected by the oil collecting structure in the chassis 500. On the other hand, the oil leakage hole 411 has a pressure relief effect, and the oil smoke enters the area between the first pressure edge 410 and the second pressure edge 420 along the matching gap between the volute 100 and the check valve 200. The airflow pressure is relieved by the oil leakage hole 411, and the airflow loses the pressure drive inside the volute 100, so the oil smoke loses the maximum power to continue moving forward, further reducing the amount of oil overflowing from the gap between the top plate 510 and the second pressure edge 420 to the top of the top plate 510.

[0056] The number of the oil leakage holes 411 can be multiple, and the multiple oil leakage holes 411 are arranged around the volute 100. The multiple oil leakage holes 411 can guide the liquid oil formed at various positions back to the chassis 500 in time.

[0057] A sealing ring 600 is crimped between the first pressing edge 410 and the top plate 510 .

[0058] A sealing ring 600 may be crimped between the first pressing edge 410 and the top plate 510 . By providing the sealing ring 600 , the 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 .

[0059] In this embodiment, the sealing ring 600 is crimped between the top plate 510 and the first pressing edge 410. By arranging the sealing ring 600 below the top plate 510, the height of the top plate 510 relative to the first pressing edge 410 can be increased, making it more difficult for the oil to move upward against gravity, thereby reducing 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.

[0060] The second pressing edge 420 is provided with an annular limiting portion 421 protruding toward the first pressing edge 410 . The annular limiting portion 421 is located outside the oil leakage hole 411 , and the annular limiting portion 421 abuts against the first pressing edge 410 ; the top plate 510 and the sealing ring 600 are located on the circumferential outside of the annular limiting portion 421 .

[0061] The annular limiting portion 421 extends from top to bottom, and the annular limiting portion 421 acts as a barrier to the lateral movement of oil smoke. Moreover, when the oil smoke passes through the annular limiting portion 421, it is not easy to move upward against the direction of gravity and flow out from the gap between the first pressing edge 410 and the top plate 510.

[0062] The annular inner wall of the sealing ring 600 is pressed against the annular outer wall of the annular limiting portion 421. The sealing ring 600 is clamped on the annular outer wall of the annular limiting portion 421 to prevent the oil from continuing to move upward after passing over the annular limiting portion 421. At the same time, it avoids excessive compression of the sealing gasket or insufficient compression, thereby increasing the service life of the sealing ring 600.

[0063] like Figure 4 As shown, during long-term operation, if some oil passes through the gap between the annular limit portion 421 of the check valve 200 and the first pressure edge 410 of the volute 100, and continues along the first route 720 to the end of the first pressure edge 410 of the volute 100, the oil will also flow back into the chassis 500, avoiding the risk of oil leakage.

[0064] like Figure 4As shown, after the oil passes through the gap between the 0th route 710 and the 1st route 720, it enters the gap of the 2nd route 730, that is, along: the vertical gap between the annular limiter 421 and the sealing ring 600 - the vertical gap between the annular limiter 421 and the top plate 510 - the horizontal gap between the second pressure edge 420 and the top plate 510, before reaching the upper surface of the top plate 510, and oil leakage occurs. The probability of the 2nd route 730 being passed is extremely low, because after the oil enters the enclosed area of ​​the check valve 200 and the volute 100 through the 0th route 710, the huge pressure in the volute 100 is gone, and the oil has no power to further go along the 1st route 720 and the 2nd route 730. It is even more difficult for the oil in the 2nd route 730 to go upward in the opposite direction of gravity. Therefore, the top plate 510 of the range hood of this solution has less oil leakage.

[0065] The thickness of the second surrounding edge 320 is equal to the difference between the inner and outer diameters of the annular flange 340 .

[0066] The second surrounding edge 320 can be just stuck in the stepped structure, and the transition between the second surrounding edge 320 and the third surrounding edge 330 is smoother. When the airflow flows along the circumferential inner wall of the second surrounding edge 320 toward the first surrounding edge 310, it can transition from the circumferential inner wall of the second surrounding edge 320 to the inner wall of the first surrounding edge 310 without obstacle. The airflow is less obstructed, and the flow rate is reduced less. The airflow quickly passes through the gap between the volute 100 and the check valve 200, thereby reducing the amount of smoke entering the gap between the volute 100 and the check valve 200.

[0067] like Figure 5 As shown, the circumferential inner side wall of the second surrounding edge 320 transitions flush with the circumferential inner side wall of the first surrounding edge 310 .

[0068] At the transition position between the first surrounding edge 310 and the second surrounding edge 320, the first surrounding edge 310 is flush with the inner side wall of the second surrounding edge 320. Specifically, the annular flange 340 can 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 inner and outer diameter difference of the annular flange 340, and the airflow encounters less resistance when flowing.

[0069] Example 2

[0070] like Figure 6-Figure 12 As shown, in this embodiment, the volute 100 has a second surround 320, and the check valve 200 has a first surround 310. The third surround 330 is located below the first surround 310. During installation, the second surround 320 is inserted into the third surround 330 from bottom to top, wherein the first gap is located above the second gap. Fig.10As shown, the difference from Example 1 is that the first pressure edge 410 extending outwardly along the circumference of the check valve 200 is arranged at intervals on the circumferential outer side of the volute 100, that is, there is a certain gap between the first pressure edge 410 and the outer wall of the volute 100, and the two are connected together by a connecting piece 800, one end of the connecting piece 800 is connected to the side wall of the first pressure edge 410 facing the volute 100, and the other end is connected to the outer wall of the volute 100. Along the circumference of the volute 100, the gap between two adjacent connecting pieces 800 forms a plug hole; the outer wall of the check valve 200 is provided with a second pressure edge 420 extending outwardly along its circumference, and the first pressure edge 410 and the second pressure edge 420 are used to clamp the top plate 510 of the chassis 500; as shown in FIG. Fig.12 As shown, a plurality of notches 900 are provided on the end surface of the third periphery 330, and the number and shape of the notches 900 correspond to the connector 800 one by one, and the notches 900 are used to avoid the connector 800 so that the third periphery 330 can be inserted into the insertion hole. The third periphery 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 periphery 330 and the annular outer side wall of the second periphery 320 is directly located in the chassis 500, and the oil flowing out of the oil outlet directly enters the chassis 500.

[0071] like Fig.11 As shown, the connecting member 800 can be a cylinder with a rectangular cross-section. The connecting member 800 is respectively connected to the first clamping edge 410 and the second clamping edge 420 by welding, or the first clamping edge 410 and the outer wall of the volute 100 are integrally formed, and then a plurality of through holes are punched, and the plurality of through holes are arranged in a circumferential direction, and the remaining portion between two adjacent through holes forms the connecting member 800.

[0072] An interference fit may be adopted between the third surrounding edge 330 and the insertion hole.

[0073] The range hood provided by the embodiment of the present invention includes the above-mentioned volute check valve assembly. Since the range hood provided by the embodiment of the present invention uses the above-mentioned volute check valve assembly, the range hood provided by the embodiment of the present invention also has the advantages of the volute check valve assembly.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 volute check valve assembly, characterized in that: The volute check valve assembly comprises: a volute (100) and a check valve (200); one of the volute (100) and the check valve (200) has a first surrounding edge (310), and the other has a second surrounding edge (320); of the first surrounding edge (310) and the second surrounding edge (320), one located on the volute (100) is used to enclose an air outlet of the volute (100), and the other located on the check valve (200) is used to enclose an air inlet of the check valve (200); The end of the first surrounding edge (310) is provided with a step structure, the step structure comprising a radial end surface connected to the inner side wall of the first surrounding edge (310) and an axial side surface connected to the radial end surface; The second surrounding edge (320) is inserted into the stepped structure, and the end surface of the second surrounding edge (320) abuts against the radial end surface, and the circumferential outer side wall of the second surrounding edge (320) fits against the axial side surface; The end of the first surrounding edge (310) is connected to an annular flange (340) extending outward along its circumferential direction; the radial inner edge of the annular flange (340) is connected to the end of the first surrounding edge (310); the radial outer edge of the annular flange (340) is connected to a third surrounding edge (330) extending toward one side of the second surrounding edge (320); the inner wall of the first surrounding edge (310), the side of the annular flange (340) facing the second surrounding edge (320), and the inner wall of the third surrounding edge (330) form the stepped structure.

2. The volute check valve assembly according to claim 1, characterized in that: The outer wall of the volute (100) is provided with a first pressing edge (410) extending outwardly along its circumferential direction, and the outer wall of the check valve (200) is provided with a second pressing edge (420) extending outwardly along its circumferential direction, and the first pressing edge (410) and the second pressing edge (420) are used to be respectively pressed on the upper and lower sides of the top plate (510) of the chassis (500); and the oil outlet of the gap formed by the second surrounding edge (320) and the axial side surface is located between the first pressing edge (410) and the second pressing edge (420).

3. The volute check valve assembly according to claim 1, characterized in that: The volute (100) has a second surrounding edge (320), and the check valve (200) has a first surrounding edge (310); The volute (100) is provided with first pressure edges (410) extending outwardly along the circumference of the check valve (200) at intervals on the circumferential outer side thereof, the first pressure edge (410) and the volute (100) being connected via a plurality of connecting pieces (800), one end of the connecting piece (800) being connected to the side wall of the volute (100) facing the first pressure edge (410), and the other end being connected to the outer wall of the volute (100); and along the circumference of the volute (100), a gap between two adjacent connecting pieces (800) forms an insertion hole; the outer wall of the check valve (200) is provided with second pressure edges (420) extending outwardly along the circumference thereof, the first pressure edge (410) and the second pressure edge (420) being used to clamp the top plate (510) of the chassis (500); A plurality of notches (900) are provided on the end surface of the third surrounding edge (330), the notches (900) corresponding one to one with the connecting pieces (800), and the notches (900) are used to avoid the connecting pieces (800) so that the third surrounding edge (330) can be plugged into the plug hole.

4. The volute check valve assembly according to claim 2 or 3, characterized in that: The first pressing edge (410) is provided with an oil leakage hole (411) arranged in a vertical direction, one end of the oil leakage hole (411) is connected to the gap between the first pressing edge (410) and the second pressing edge (420), and the other end of the oil leakage hole (411) is connected to the inside of the chassis (500), and the oil leakage hole (411) is used to introduce oil into the chassis (500).

5. The volute check valve assembly according to claim 4, characterized in that: There are a plurality of the oil leakage holes (411), and the plurality of the oil leakage holes (411) are arranged around the volute (100).

6. The volute check valve assembly according to claim 4, characterized in that: A sealing ring (600) is crimped between the first pressing edge (410) and the top plate (510).

7. The volute check valve assembly according to claim 6, characterized in that: An annular limiting portion (421) protruding toward the first pressing edge (410) is provided on the second pressing edge (420), the annular limiting portion (421) is located outside the oil leakage hole (411), and the annular limiting portion (421) abuts against the first pressing edge (410); The top plate (510) and the sealing ring (600) are located on the circumferential outer side of the annular limiting portion (421).

8. The volute check valve assembly according to claim 7, characterized in that: The annular inner wall of the sealing ring (600) is crimped onto the annular outer wall of the annular limiting portion (421).

9. The volute check valve assembly according to claim 1, characterized in that: The thickness of the second surrounding edge (320) is equal to the difference between the inner and outer diameters of the annular convex edge (340).

10. The volute check valve assembly according to claim 9, characterized in that: The circumferential inner side wall of the second surrounding edge (320) transitions flush with the circumferential inner side wall of the first surrounding edge (310).

11. A range hood, characterized in that: The range hood comprises the volute check valve assembly according to any one of claims 1 to 10.

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