Flow collector of centrifugal fan, centrifugal fan and range hood

Abstract

The utility model relates to a current collector of a centrifugal fan, the centrifugal fan and a range hood, the current collector comprises a current collector main body, the current collector main body comprises an annular flow guide part and a connecting ring extending outwards from the flow guide part along the radial direction; the connecting ring is provided with a shaft hole and a locking knob rotationally arranged in the shaft hole, the locking knob comprises a knob body, a lock rod and a lock catch piece, the lock catch piece comprises a connecting column and a limiting convex buckle extending from the connecting column to the side portion, and the knob body and the lock catch piece are located on the front side and the rear side of the connecting ring respectively. The rotary knob body is provided with a shaft hole and is connected through a lock rod penetrating through the shaft hole, the lock rod and the rotary knob body are detachably connected, and the lock rod and the rotary knob body can be limited in the axial direction and the circumferential direction of the lock rod. When the current collector needs to be cleaned, all parts of the locking knob can be detached, so that the main body of the current collector is more convenient to clean, and no cleaning dead angle exists.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field especially, relates to a kind of flow collector of centrifugal fan, centrifugal fan and range hood. BACKGROUND

[0002] The information provided in this section is presented to generally present the context of the application and does not constitute prior art.

[0003] The range hood is a kind of kitchen electrical appliances for purifying kitchen environment, for the oil fume generated in the cooking process is rapidly drawn away, improve the kitchen environment.Volute is an important component of range hood, it generally includes front cover plate, rear cover plate and ring wall between front cover plate and rear cover plate, front cover plate air inlet is equipped with flow collector.The front cover plate of traditional volute and flow collector are generally assembled together by screw connection mode, disassembly is very inconvenient.

[0004] In order to realize the quick disassembly between flow collector and volute, also by setting locking knob of flow collector and front side plate of volute are connected, flow collector is equipped with rotatable locking knob, front side plate of volute is equipped with matched limiting hole, when it is needed to install flow collector to the front side plate of volute, only need to rotate a certain angle after the limiting protruding buckle of locking knob passes through the limiting hole on the front side plate of volute, limiting protruding buckle can be limited at the rear side of limiting hole outer periphery, and it is in locked state without being forwardly out of limiting hole.When it is needed to disassemble flow collector, rotate locking knob to the position where limiting protruding buckle is opposite to limiting hole, so that limiting protruding buckle can be forwardly out of limiting hole to realize unlocking.How to simplify the rotating assembly structure between locking knob and flow collector, and realize the quick disassembly between locking knob and flow collector is a technical problem to be solved.

[0005] Therefore, the flow collector mounting structure of the existing centrifugal fan still needs to be further improved. UTILITY MODEL CONTENTS

[0006] The first technical problem to be solved by the utility model is to provide a flow collector of centrifugal fan for simplifying the rotating assembly structure between locking knob and flow collector, and realizing the quick disassembly between locking knob and flow collector according to the status of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a centrifugal fan applying the above flow collector according to the status of the prior art.

[0008] The third technical problem to be solved by the utility model is to provide a range hood applying the above centrifugal fan according to the status of the prior art.

[0009] The utility model solves the technical scheme that the first technical problem adopts for: a kind of flow collector of centrifugal fan, including

[0010] Flow collector main part, including the flow guide portion of annular and the connecting ring that the flow guide portion extends radially outward from along the direction;

[0011] The connecting ring is equipped with shaft hole and the locking knob that is rotationally arranged in the shaft hole, the locking knob includes knob main body, lock rod and lock catch, the lock catch includes connecting column and the limiting protruding buckle that extends from connecting column to side portion, the knob main body and the lock catch are located respectively at the front and back of the connecting ring, and are connected by lock rod that is arranged in the shaft hole, the lock rod and the knob main body are detachably connected, and both can be limited in the axial direction and the circumferential direction of lock rod.

[0012] The second end of lock rod can be fixedly connected with lock catch, also can be detachably connected with lock catch, when the both are detachably connected, the second end of the lock rod and the lock catch can be limited in the axial direction and the circumferential direction of lock rod.

[0013] In order to simplify the detachable assembly structure between lock rod, lock catch, knob main body, the connecting column has the movable channel that is axially opened, the second end of the lock rod is slidably arranged in the movable channel, and the second end of the lock rod and the inner wall of the movable channel are limited in the circumferential direction by the way of key groove cooperation, the first end of the lock rod has the limiting pin shaft that is radially outward protruding, the inside of the knob main body is limited to lock chamber, and is equipped with the first installation port that can be extended into the lock chamber for the first end of the lock rod and its limiting pin shaft on the side towards the lock catch, the movable channel is also equipped with elastic element, the elastic element acts on the lock rod, and makes the lock rod always have the tendency of moving away from the side of knob main body along its axial direction, the inner wall of the lock chamber is equipped with limiting clamping groove on the side adjacent to the first installation port, after the limiting pin shaft of the lock rod enters the lock chamber after rotating a certain angle, it can be clamped into the limiting clamping groove under the action of elastic element.

[0014] In order to realize the limiting between lock rod and lock catch in the circumferential direction, the outer peripheral wall of the second end of the lock rod has the outward protruding key, the inner peripheral wall of the movable channel has the sliding slot that is opened along its length direction, the key is slidably limited in the sliding slot.

[0015] The elastic member can adopt various prior art, and can include compression spring, torsion spring, spring leaf and various elastic elements, but in order to better cooperate with the lock rod arranged in the movable hole, the outer peripheral wall of the second end of the lock rod is further provided with an outward protruding limiting stop portion, the elastic member is a spring arranged in the movable hole and sleeved outside the lock rod, the first end of the spring abuts against the limiting stop portion of the lock rod, and the second end abuts against the inner wall of the movable hole.

[0016] In order to facilitate the installation of the lock rod, the spring and other components, the connecting column of the lock catch member is provided with a second mounting opening penetrating the movable hole at an end away from the knob body, and the connecting column is provided with a through hole penetrating the movable hole at an end towards the knob body, the lock rod can be mounted into the movable hole through the second mounting opening, and the first end of the lock rod extends out through the through hole.

[0017] As an improvement, the knob body is further provided with a connecting hole at a side towards the lock catch member, a first mounting opening penetrating into the locking chamber is formed in the bottom wall of the connecting hole, the connecting ring is further provided with a fixing sleeve at the shaft hole position at a side towards the knob body, the lock rod is connected with the knob body through the fixing sleeve, the fixing sleeve extends into the connecting hole, and the outer peripheral wall of the fixing sleeve is connected with the inner peripheral wall of the connecting hole through threads, so that the knob body can be close to or away from the connecting ring when being rotated in positive direction or reverse direction.

[0018] As an improvement, the connecting ring is further provided with a first flange bent towards the rear side at the outer peripheral edge. The height of the first flange can be about 2-3mm, so as to increase the strength of the current collector at the position not subjected to force and ensure the overall flatness, and the current collector can better contact with the volute.

[0019] The utility model discloses a centrifugal fan that solves the second technical problem adopts the technical scheme of: a centrifugal fan, including volute and current collector, the front side board of volute is provided with air inlet, the current collector is installed at the air inlet of volute in detachable mode, the current collector adopts the current collector of above-mentioned centrifugal fan, the front side board of volute is provided with the limiting hole that passes through from front to back, and the limiting hole is used for the lock catch member to pass through, the locking knob has at least the locking state of making the lock catch member limit at the rear side of the peripheral edge of limiting hole to limit the lock catch member and the unlocking state of making the lock catch member move to the position opposite limiting hole to allow the lock catch member to come out from limiting hole to the front with the change of the rotating position of connecting ring.

[0020] Generally speaking, the connecting ring of the current collector can be connected with the volute through two or more locking knobs arranged in the circumferential direction, but considering the cost and the installation firmness, other conventional pin connection matching mode can be matched to realize the installation of the current collector, specifically, the outer peripheral edge of the connecting ring has an outwardly extending pin, and the front side plate of the volute is provided with a first positioning socket for inserting the pin.

[0021] In order to further ensure the firmness of the installation of the current collector, the positions of the pins on the connecting ring and the positions of the locking knobs are respectively located on opposite sides of the connecting ring.

[0022] In order to effectively prompt the locking knob in the locked state and further improve the installation efficiency of the current collector, the front side plate further has two positioning protrusions arranged in the circumferential direction of the locking knob on the side surface facing the volute, and the limiting protrusion is limited between the two positioning protrusions when the locking knob is in the locked state. The design of the above-mentioned positioning protrusion can prompt the feeling of rotation to the right position during the rotation of the locking knob.

[0023] The technical scheme adopted by the utility model to solve the third technical problem is: a range hood, including a casing and a centrifugal fan arranged in the casing, the centrifugal fan adopts the above-mentioned centrifugal fan.

[0024] In order to facilitate the direct disassembly of the current collector, the casing includes a front panel, the front panel has a third mounting hole opposite to the air inlet of the volute, the connecting ring of the current collector abuts against the front side of the peripheral edge of the third mounting hole, and the peripheral edge of the third mounting hole is provided with a first through hole for the lock piece and the lock rod to pass through, and the first through hole is opposite to the limiting hole. The above-mentioned structure design can install and disassemble the current collector without disassembling the front panel of the casing, so as to facilitate the cleaning operation of the impeller and the volute.

[0025] In order to ensure the sealing property between the front panel and the volute and make them abut against each other to reduce the vibration noise problem, a sealing ring is further arranged between the peripheral edge of the third mounting hole of the front panel and the front side plate of the volute.

[0026] In order to further ensure the firmness and sealing property of the installation of the sealing ring, the peripheral edge of the air inlet of the front side plate of the volute has a second folded edge folded forward, the inner side edge of the sealing ring has a protruding part protruding to the side part, so that the cross section of the sealing ring is stepped, and the protruding part of the sealing ring is clamped between the second folded edge and the peripheral edge of the third mounting hole of the front panel.

[0027] In order to further reduce the air leakage problem, the connecting ring is in contact with the protruding part of the sealing ring on one side of the volute in the installed state of the current collector.

[0028] Further improvement, the sealing ring has at least two positioning columns arranged in sequence on the side of the volute, and the front side plate of the volute is provided with at least two positioning holes for the positioning columns.

[0029] Compared with the prior art, the advantages of the utility model are that: the locking knob on the current collector is connected with the lock catch through the lock rod, wherein the lock rod and the knob body are detachably connected, when the current collector needs to be cleaned, the components of the locking knob can be disassembled, so that the main body of the current collector is more convenient to clean, and there is no dead angle for cleaning. In addition, after the locking knob is installed on the connecting ring, the first end of the lock rod and the knob body can be limited in the axial and circumferential directions of the lock rod, so that rotating the knob body can drive the lock catch to rotate, and the unlocking and locking actions are realized. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a three-dimensional structural schematic view of the range hood of the utility model embodiment;

[0031] Figure 2 It is a sectional view of the range hood of the utility model embodiment;

[0032] Figure 3 It is a sectional view of the current collector of the utility model embodiment;

[0033] Figure 4 It is an exploded view of the locking knob of the current collector of the utility model embodiment;

[0034] Figure 5 It is a sectional view of the components of the locking knob of the current collector of the utility model embodiment in the disassembled state;

[0035] Figure 6 It is a three-dimensional structural schematic view of the inner side of the centrifugal fan of the utility model embodiment;

[0036] Figure 7 It is a three-dimensional structural schematic view of the front panel of the casing of the utility model embodiment;

[0037] Figure 8 It is a sectional view of the range hood of the utility model embodiment;

[0038] Figure 9 It is a three-dimensional structural schematic view of the back of the front panel of the utility model embodiment (the locking knob is in the unlocked state);

[0039] Figure 10 It is a schematic view of the three-dimensional structure of the back of the front panel of the embodiment of the present utility model (the locking knob is in the locking state). DETAILED DESCRIPTION

[0040] The present utility model will be described in further detail below in combination with the embodiments of the drawings.

[0041] In the description and claims of the present utility model, terms indicating directions, such as "front", "back", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various example structural parts and elements of the present utility model, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed in the present utility model can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limitation, for example, "upper" and "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0042] Figures 1-10 A preferred embodiment of the current utility model is shown, which is a current centrifugal fan, a current centrifugal fan and an extractor hood. The extractor hood comprises a casing 5 and a centrifugal fan arranged in the casing 5, and an air inlet 110 is formed on the front side wall (i.e. the front panel 51) of the casing 5, so that external smoke can enter the casing 5 through the air inlet 110. The centrifugal fan generates negative pressure when it operates, and external oil fume can be sucked into the casing 5 through the air inlet 110. The bottom of the casing 5 is also provided with an oil cup 54 extending left and right, which is used to collect the oil flowing down from the casing 5. The front part of the casing 5 is also provided with a smoke baffle 53 which can deflect forward and backward relative to the casing 5, and the smoke baffle 53 is connected to the main body of the casing 5 through a hinge movement mechanism, which can specifically deflect forward to open the above-mentioned air inlet and deflect backward to block and close the above-mentioned air inlet. The hinge movement mechanism for driving the smoke baffle to deflect can adopt the conventional hinge movement mechanism in the prior art, which will not be described here.

[0043] Referring to Figure 2The centrifugal fan comprises a volute 1, an impeller 21 rotatably arranged in the volute 1, and a motor 22 for driving the impeller 21 to rotate. The volute 1 comprises a front side plate 11, a rear side plate 12, and a ring wall 13 connected between the front side plate 11 and the rear side plate 12, and a corresponding air inlet 110 is formed in the front side plate 11. A flow collector is arranged at the air inlet 110 of the front side plate 11 of the volute 1. The flow collector comprises a flow guide portion 31 in the form of a ring and a connecting ring 32 extending radially outward from the flow guide portion 31. The flow guide portion 31 of the flow collector generally comprises a radial flow guide portion 31 in the form of a circular arc and an axial flow guide portion 31 extending circumferentially from the inner side of the radial flow guide portion 31. A filter screen 30 is further arranged at the central opening of the flow guide portion 31 of the flow collector. The connecting ring 32 of the flow collector is a flat annular plate structure and can be attached to the outer peripheral edge of the air inlet 110 of the front side plate of the volute 1. The inner side opening of the flow guide portion 31 of the flow collector is further attached with a filter screen 30 for filtering oil fume and balancing airflow.

[0044] Referring to Figure 3 The outer peripheral edge of the connecting ring 32 of the flow collector of the embodiment has an outwardly extending lug portion 321, and a locking knob 4 is rotatably arranged at the lug portion 321. The locking knob 4 comprises a knob main body 40, a locking piece 43, and a locking rod 46. The knob main body 40 comprises a limiting disc 42 and a knob operating portion 41 protruding from the front side of the limiting disc 42, wherein the knob operating portion 41 is a one-character knob. An axial hole 3210 is formed in the lug portion 321 of the connecting ring 32 for the locking rod 46 to pass through. The locking piece 43 comprises a connecting column 44 and a limiting lug 45 extending from the connecting column 44 to the side portion. The connecting column 44 of the locking piece 43 and the knob main body 40 are respectively arranged on the front and rear sides of the connecting ring 32 and are connected through the locking rod 46 passing through the axial hole 3210. The locking rod 46 is detachably connected with the knob main body 40, and the first end of the locking rod 46 is limited in the axial and circumferential directions of the locking rod 46. The second end of the locking rod 46 is detachably connected with the connecting column 44 of the locking piece 43, and the second end of the locking rod 46 is limited in the axial and circumferential directions of the locking rod 46.

[0045] Referring to Figures 3-5In order to simplify the detachable assembly structure among the lock rod 46, the lock catch 43 and the knob body 40, the connecting column 44 is provided with an axial movable channel 440, the second end of the lock rod 46 is slidably arranged in the movable channel 440, and the second end of the lock rod 46 and the inner wall of the movable channel 440 are limited in the circumferential direction by the key groove cooperation. Specifically, the outer circumferential wall of the second end of the lock rod 46 is provided with two outwardly protruding keys 463, the inner circumferential wall of the movable channel 440 is provided with two corresponding sliding grooves 441 along the length direction, and the two keys 463 are respectively slidably limited in the two sliding grooves 441 of the movable channel 440. Through the cooperation of the keys 463 and the sliding grooves 441, on the one hand, the lock rod 46 and the lock catch 43 can be limited in the circumferential direction, so that the lock catch 43 can be rotated when the lock rod 46 rotates; on the other hand, the stability of the relative movement between the lock rod 46 and the lock catch 43 in the axial direction can be ensured. The outer circumferential wall of the second end of the lock rod 46 is also provided with an outwardly protruding limiting stop 462, the outer edge of the limiting stop 462 is circular, and the keys 463 are correspondingly arranged at the outer edge of the limiting stop 462. The end of the connecting column 44 of the lock catch 43 away from the knob body 40 is provided with a second mounting opening 442 in communication with the movable channel 440, and the end of the connecting column 44 towards the knob body 40 is provided with a through hole 443 in communication with the movable channel 440, the lock rod 46 can be mounted into the movable channel 440 through the second mounting opening 442, and the first end of the lock rod 46 extends out through the through hole 443. The diameter of the through hole 443 is matched with the outer diameter of the main body of the lock rod 46, but smaller than the outer diameter of the limiting stop 462 on the lock rod 46, so that the circumferential edge of the through hole 443 can be used to limit the axial movement of the lock rod 46. The movable channel 440 of the lock catch 43 is also provided with an elastic member 47, which is a spring and is sleeved outside the lock rod 46, the first end of the spring abuts against the limiting stop 462 of the lock rod 46, and the second end abuts against the circumferential edge of the through hole 443 of the movable channel 440. Under the elastic force of the elastic member 47, the lock rod 46 always has a tendency to move away from the knob body 40 in the axial direction.

[0046] The first end of the lock rod 46 is provided with a limiting pin 461 protruding radially outward, which can be integrally arranged on the first end of the lock rod 46 or installed on the first end of the lock rod 46 in the form of a split part.

[0047] The inside of the limiting disc 42 of the knob body 40 defines a locking chamber 420, and a first mounting port 422 is formed on the side facing the lock piece 43, which can allow the first end of the locking rod 46 and its limiting pin shaft 461 to extend into the locking chamber 420, and the first mounting port 422 is a strip-shaped port. The inner wall of the locking chamber 420 is provided with a limiting clamping groove 421 on the side adjacent to the first mounting port 422, and the limiting clamping groove 421 is a strip-shaped clamping groove and is arranged in a circumferential direction opposite to the first mounting port 422. After the limiting pin shaft 461 of the locking rod 46 extends into the locking chamber 420 through the first mounting port 422 and rotates by a certain angle, it can be clamped into the limiting clamping groove 421 under the action of the elastic member 47, thereby achieving the tensioning between the lock body and the lock piece 43 in the axial direction.

[0048] The knob body 40 is also provided with a connecting hole 423 on the side facing the lock piece 43, and the first mounting port 422 is formed in the bottom wall of the connecting hole 423. The connecting ring 32 is also provided with a fixing sleeve 48 at the shaft hole 3210 on the side facing the knob body 40. The fixing sleeve 48 can be embedded in the shaft hole 3210 of the connecting ring 32, or can be fixed on the side of the connecting ring 32 facing the knob body 40 by adhesion. The locking rod 46 is connected to the knob body 40 through the fixing sleeve 48. Specifically, the size and shape of the connecting hole 423 of the knob body 40 are matched with the outer contour of the fixing sleeve 48, the fixing sleeve 48 can extend into the connecting hole 423, and the outer peripheral wall of the fixing sleeve 48 and the inner peripheral wall of the connecting hole 423 are connected by threads. Therefore, when the knob body 40 rotates in the forward and reverse directions, it can be close to or away from the connecting ring 32 under the adjustment of the threads.

[0049] The limiting protrusion 45 of the lock piece 43 protrudes radially outward from the peripheral wall of the connecting column 44, and there is still a certain gap between the front end of the limiting protrusion 45 and the limiting disc 42 of the knob body 40. In the preferred embodiment, the limiting protrusion 45 is a rib structure extending in the axial direction of the connecting column 44, and the size of the limiting protrusion 45 protruding outward relative to the connecting column 44 gradually increases from back to front, that is, the outer edge of the limiting protrusion 45 forms a guide slope, so that the limiting protrusion 45 can be conveniently passed through the limiting hole 111 of the front side plate of the volute 1 during installation.

[0050] The front side plate of the volute 1 is provided with a front-to-rear through limiting hole 111, and the limiting protruding buckle 45 of the locking knob 4 can pass through the limiting hole 111 rearward and be limited on the rear side of the outer periphery of the limiting hole 111 after rotating by a certain angle. Specifically, the locking knob 4 has at least a locking state in which the limiting protruding buckle 45 is limited on the rear side of the outer periphery of the limiting hole 111 to limit the forward extrusion of the limiting protruding buckle 45 from the limiting hole 111 and an unlocking state in which the limiting protruding buckle 45 is moved to a position opposite to the limiting hole 111 to allow the forward extrusion of the limiting protruding buckle 45 from the limiting hole 111, according to the change of the rotating position of the locking knob 4 relative to the connecting ring 32. As can be seen from the foregoing, during the rotation of the knob body 40 from the unlocking position to the locking position, the knob body 40 is close to the connecting ring 32 under the thread adjustment; during the rotation of the knob body 40 from the locking position to the unlocking position, the knob body 40 is away from the connecting ring 32 under the thread adjustment.

[0051] Referring to Figure 6 , in order to effectively prompt the locking knob 4 to be in the locking state and further improve the installation efficiency of the current collector, the front side plate further has two positioning protrusions arranged at intervals along the circumference of the locking knob 4 on the side wall surface facing the volute 1, and the limiting protruding buckle 45 is limited between the two positioning protrusions 112 when the locking knob 4 is in the locking state. The distance between the two positioning protrusions 112 is matched with the thickness of the limiting protruding buckle 45 of the locking knob 4, so that the left and right swinging of the limiting protruding buckle 45 can be effectively limited, and the locking knob 4 can be stably kept in the locking state. The top of the positioning protrusion 112 can be designed as a smooth convex curved surface, so that the front end of the limiting protruding buckle 45 can smoothly pass through the opposite positioning protrusion and be limited between the two positioning protrusions during the rotation of the locking knob 4. The design of the positioning protrusion 112 can also prompt the feeling of rotation to the right position of the locking knob 4 during the rotation, and improve the user experience.

[0052] The connecting ring 32 of the embodiment has an outwardly extending plug 322 at the outer periphery edge, and the front side plate is provided with a first positioning socket 113 for inserting the plug 322. The position where the plug 322 connects with the connecting ring 32 is inclined rearward to form a limiting step. After the plug 322 of the current collector is installed in place, the limiting step allows the current collector to be deflected rearward around the position of the plug 322, so that the connecting ring 32 of the current collector is better attached to the outer side plate of the volute 1. In order to prevent air leakage and other problems of uneven force after installation of the current collector, the plug 322 of the current collector of the embodiment has two positions, and the positions of the two plugs 322 and the position of the locking knob 4 are respectively located on the opposite sides of the connecting ring 32, so as to ensure the firmness of the installation of the current collector.

[0053] Referring to Figure 6 and Figure 7, the casing 5 of the range hood comprises a front panel 51, wherein the front panel 51 has a third mounting opening 511 opposite to the air inlet 110 of the volute 1, and the third mounting opening 511 is also circular or circular-like in structure. In order to facilitate the flow of flue gas, the outer peripheral edge of the front panel 51 is gradually inclined to the arc surface structure at the position of the third mounting opening 511, and the peripheral edge portion of the third mounting opening 511 is a planar structure. The connecting ring 32 of the collector is attached to the front side of the peripheral edge of the third mounting opening 511 of the front panel 51, that is, the peripheral edge of the third mounting opening 511 is embedded between the connecting ring 32 of the collector and the front side panel of the volute 1. The peripheral edge of the third mounting opening 511 is provided with a first through hole 512 for the lock catch 43 and the lock rod 46 to pass through, and the first through hole 512 is opposite to the limiting hole 111, wherein the shape and size of the first through hole 512 are basically the same as those of the limiting hole 111. With this structure, the front panel 51 of the casing 5 does not need to be disassembled, and the collector can be installed and disassembled, thereby facilitating the cleaning operation of the impeller 21 and the interior of the volute 1.

[0054] The peripheral edge of the third mounting opening 511 of the front panel 51 is also provided with a second positioning socket 513 opposite to the first positioning socket 113 on the front side panel of the volute 1. When the collector is installed, the pin 322 on the connecting ring 32 of the collector can pass through the second positioning socket 513 and be inserted into the first positioning socket 113 of the volute 1.

[0055] Continuing to refer to Figure 2 , a sealing ring 52 is further arranged between the peripheral edge of the third mounting opening 511 of the front panel 51 and the front side panel of the volute 1. The peripheral edge of the air inlet 110 of the front side panel of the volute 1 has a second folded edge 114 folded forward, and the inner side edge of the sealing ring 52 has a protruding portion 521 protruding to the side, so that the cross section of the sealing ring 52 is stepped. The protruding portion 521 of the sealing ring 52 is clamped between the second folded edge 114 and the peripheral edge of the third mounting opening 511 of the front panel 51, and the other part of the sealing ring 52 is clamped between the peripheral edge of the third mounting opening 511 of the front panel 51 and the front side panel of the volute 1. The installation structure of the sealing ring 52 can effectively ensure the sealing between the front panel 51 and the volute 1 and make them close together to reduce the problem of vibration noise.

[0056] The side of the sealing ring 52 facing the volute 1 has at least two positioning columns 522 arranged in sequence in the circumferential direction, and the front side panel of the volute 1 is provided with at least two positioning holes 115 for the positioning columns 522 to be correspondingly clamped therein. After the sealing ring 52 is embedded in the positioning holes 115 of the front side panel of the volute 1 through the positioning columns 522, the installation firmness and the accuracy of the installation position of the sealing ring 52 can be ensured, and the installation efficiency is improved.

[0057] The connecting ring 32 of the current collector further has a first flange 323 bent towards the rear side at the outer peripheral edge. The height of the first flange 323 can be about 2-3 mm. When the current collector is installed in place, the first flange 323 can abut against the peripheral edge of the third mounting hole 511 of the front panel 51 to increase the strength of the current collector at the position where the current collector is not subjected to force, and to ensure the overall flatness so as to better contact the volute 1. In order to further reduce the air leakage problem, the side of the connecting ring 32 towards the volute 1 is in contact with the protruding portion 521 of the sealing ring 52.

[0058] The current collector of the embodiment is connected to the front side plate of the volute 1 by the locking knob 4. When the current collector needs to be installed on the front side plate of the volute 1, only the limiting protruding buckle 45 of the locking knob 4 needs to be inserted through the limiting hole 111 on the front side plate of the volute 1 and then rotated by a certain angle. The limiting protruding buckle 45 is then limited on the rear side of the peripheral edge of the limiting hole 111 and cannot be pulled out of the limiting hole 111 to be in the locked state. When the current collector needs to be disassembled, the locking knob 4 is rotated to the position where the limiting protruding buckle 45 is opposite to the limiting hole 111. In this way, the limiting protruding buckle 45 can be pulled out of the limiting hole 111 to be unlocked. The locking and unlocking by the locking knob 4 is more convenient for the operator to operate, and the disassembly process is more labor-saving. In addition, the locking knob 4 is not easy to be loosened or detached due to the movement and vibration of the fan, which ensures the reliability of the connection between the current collector and the front side plate of the volute 1.

[0059] Referring to 8- Figure 10The limiting disc 42 of the locking knob 4 has a part of the outer periphery exposed outside the connecting ring 32, and the part of the limiting disc 42 exposed outside the outer periphery of the connecting ring 32 is provided with a magnet 424 on the side facing the position of the volute 1. In order to realize the installation detection and safety locking of the current collector, the electromagnetic lock 6 and the Hall sensor 64 are further arranged on the outer side of the ring wall 13 of the volute 1 adjacent to the position of the locking knob 4. Since the magnet 424 is arranged on the locking knob 4, the magnet 424 will move through the rotation of the locking knob 4. When the locking knob 4 is right-rotated to the limiting position, the magnet 424 will transmit a signal to the Hall sensor 64 (or reed tube) on the rear side. After the Hall sensor 64 senses the magnetic field of the magnet 424, a signal will be sent, and then the system will power on the electromagnetic lock 6. The locking tongue 61 of the electromagnetic lock 6 will move upward (a third through hole 515 is arranged on the front panel 51 for the locking tongue 61 to pass through), and lock with the locking position 425 on the knob body 40 of the locking knob 4, so as to realize the locking of the locking knob 4. At this time, the range hood can work normally. If the locking knob 4 is not rotated to the position, it means that the current collector is not installed reliably, and the Hall sensor 64 will not be triggered. At this time, the system of the range hood is not powered, and the impeller 21 will not rotate. In this way, the risk of touching the rotating impeller 21 during the disassembly process when the current collector is not installed properly can be avoided. Specifically, the mounting bracket 62 is arranged on the side of the volute 1, the mounting bracket 62 is provided with a protective cover, and the electromagnetic lock 6 and the Hall sensor 64 are arranged in the protective cover. The protective cover is used to reduce the pollution of oil fume to the components, and is fastened by screws. The electromagnetic lock 6 is also subjected to oil-proof treatment. Specifically, a telescopic rubber oil-proof sleeve 63 structure is used. The oil-proof sleeve 63 is conical as a whole, the small head of the oil-proof sleeve 63 is clamped in the clamping groove of the locking tongue 61 of the electromagnetic lock 6, and the large head of the oil-proof sleeve 63 is clamped in the plastic shell clamping groove of the electromagnetic lock 6. In this way, the inside of the electromagnetic lock 6 can be prevented from being polluted by oil.

[0060] The Hall sensor 64 mainly releases an electric signal by sensing the magnetic field of the magnet 424, but its sensing is affected by the size of the magnet 424 and the distance from the magnet 424. Since the magnet 424 on the knob body 40 and the Hall sensor 64 are separated by the iron panel, that is, through the front panel 51, there must be a distance between the magnet 424 and the Hall sensor 64 that cannot be contacted. The iron panel will shield the magnetic field. Only a hole (also the second through hole 514) can be opened in the iron panel to remove the shielding. However, in order to be beautiful and prevent oil from entering and being difficult to clean, the hole should not be too large. However, the magnetism of the magnet 424 cannot be too strong. If it is too strong, on the one hand, it will increase the volume and then increase the cost. In addition, when disassembled, the strong suction force will also be attracted to the iron panel, affecting the disassembly experience. If the magnet 424 is too strong, the Hall sensor 64 may also sense the signal before the knob is in place, causing the whole machine to power on too early. Therefore, the balance between the magnetism of the magnet 424 and the Hall is particularly important. In the embodiment, the knob body 40 is screw-coupled with the middle fixed sleeve 48. When the locking knob 4 is in the disassembled state of the current collector, the locking knob 4 will rotate to the left. Under the driving of the middle fixed sleeve 48, the locking knob 4 will gradually rise during the left rotation, increasing the distance between the magnet 424 and the iron panel, so that the disassembly of the current collector will not be affected by the suction force of the magnet 424. When locked by rotating to the right, the locking knob 4 will move the magnet 424 downward while rotating to the right. When rotated to the right in place, the distance between the magnet 424 and the iron panel is also the closest. At this time, the magnet 424 will transmit the magnetic field signal to the Hall sensor 64 through the opening of the iron panel, achieving the installation in place reminder.

[0061] Because the iron panel is opened for the normal transmission of the magnetic field, but when the user disassembles the current collector to clean the oil stains on the appearance of the whole machine, the oil on the cloth will be smeared into the hole of the panel opening, which will cause the oil stains to enter the panel opening. On the one hand, it may affect the signal transmission, and on the other hand, it will reduce the user experience (oil stains sticking to the hole). In order to solve this problem, combined with the rotating movement of the locking knob 4, a linkage structure is made, and the ring-shaped tooth part 444 is correspondingly arranged on the connecting column 44 of the locking part 43 of the locking knob 4. The transmission gear 490 and the shielding plate 491 with the fan-shaped teeth 492 at the end are also arranged on the rear side of the front panel 51. The transmission gear 490 and the shielding plate 491 are rotatably arranged on the front panel 51 through the corresponding pin shafts. When the locking knob 4 drives the ring-shaped tooth part 444 to rotate, the power is transmitted to the shielding plate 491 through the transmission gear 490, and then the shielding plate 491 is rotated. When the locking knob 4 is in the disassembled position (that is, in the unlocked position), the shielding plate 491 is just blocked at the second through hole 514 of the panel. At this time, when the user cleans the surface of the smoke machine, the oil stains will not be wiped into the second through hole 514. When the knob is locked by rotating to the right, the shielding plate 491 will rotate with the rotation of the knob, away from the second through hole 514 of the panel, ensuring that the Hall sensor 64 can accept the magnetic induction of the magnet 424, and ensuring that the locking tongue 61 of the electromagnetic lock 6 can be locked.

Claims

1. A collector of a centrifugal fan, comprising: a collector body (3) including a flow guide portion (31) in the form of a ring and a connecting ring (32) extending radially outward from the flow guide portion (31); characterized in that the connecting ring (32) is provided with a shaft hole (3210) and a locking knob (4) rotatably arranged in the shaft hole (3210), the locking knob (4) including a knob body (40), a locking rod (46) and a locking piece (43), the locking piece (43) including a connecting column (44) and a limiting protruding buckle (45) extending from the connecting column (44) to a side portion, the knob body (40) and the locking piece (43) being respectively located on the front and rear sides of the connecting ring (32) and being connected through the locking rod (46) arranged in the shaft hole (3210), the locking rod (46) being detachably connected with the knob body (40) and being capable of being limited in the axial and circumferential directions of the locking rod (46).

2. The collector for a centrifugal fan according to claim 1, characterized in that: The connecting column (44) is provided with an axial movable channel (440), the second end of the locking rod (46) is slidingly arranged in the movable channel (440), and the second end of the locking rod (46) and the inner wall of the movable channel (440) are limited in the circumferential direction through a key groove cooperation, the first end of the locking rod (46) is provided with a limiting pin shaft (461) protruding radially outward, the inside of the knob body (40) is defined as a locking chamber (420), and a first mounting port (422) is arranged on the side facing the locking piece (43) to allow the first end of the locking rod (46) and the limiting pin shaft (461) to extend into the locking chamber (420), and a resilient member (47) is further arranged in the movable channel (440), which acts on the locking rod (46) and makes the locking rod (46) always have a tendency to move away from the side of the knob body (40) in the axial direction, and a limiting clamping groove (421) is arranged on the inner wall of the locking chamber (420) adjacent to the first mounting port (422), and after the limiting pin shaft (461) of the locking rod (46) passes through the first mounting port (422) and enters the locking chamber (420) and rotates by a certain angle, it can be clamped into the limiting clamping groove (421) under the action of the resilient member (47).

3. The collector for a centrifugal fan according to claim 2, characterized in that: The outer peripheral wall of the second end of the locking rod (46) is provided with an outward protruding key (463), and the inner peripheral wall of the movable channel (440) is provided with a sliding groove (441) arranged along the length direction thereof, and the key (463) is slidingly limited in the sliding groove (441).

4. The collector for a centrifugal fan according to claim 3, characterized in that: The outer peripheral wall of the second end of the locking rod (46) is further provided with an outward protruding limiting stop portion (462), and the resilient member (47) is a spring arranged in the movable channel (440) and sleeved outside the locking rod (46), the first end of the spring abuts against the limiting stop portion (462) of the locking rod (46), and the second end abuts against the inner wall of the movable channel (440).

5. The collector for a centrifugal fan according to claim 4, characterized in that: The connecting column (44) of the lock piece (43) has a second installation opening (442) penetrating the movable channel (440) at one end away from the knob body (40), and the connecting column (44) has a through hole (443) penetrating the movable channel (440) at one end towards the knob body (40), the lock rod (46) can be installed into the movable channel (440) through the second installation opening (442), and the first end of the lock rod (46) extends out through the through hole (443).

6. The collector for a centrifugal fan according to claim 2, characterized in that: The knob body (40) is further provided with a connecting channel (423) on the side towards the lock piece (43), the bottom wall of the connecting channel (423) is provided with a first installation opening (422) penetrating into the locking chamber (420), the connecting ring (32) is further provided with a fixing sleeve (48) at the shaft hole (3210) position on the side towards the knob body (40), the lock rod (46) is connected with the knob body (40) through the fixing sleeve (48), the fixing sleeve (48) extends into the connecting channel (423), and the outer peripheral wall of the fixing sleeve (48) is connected with the inner peripheral wall of the connecting channel (423) through threads, so that the knob body (40) can be close to or away from the connecting ring (32) when it rotates in the forward or reverse direction.

7. The collector for a centrifugal fan according to claim 1, characterized in that: The connecting ring (32) is further provided with a first flange (323) bent towards the rear side at the outer peripheral edge.

8. A centrifugal fan comprising a volute (1) and a collector, a front side plate of the volute (1) being provided with an air inlet (110), the collector being detachably mounted at the air inlet (110) of the volute (1), characterized in that: The collector adopts the collector of the centrifugal fan according to any one of claims 1-7, the front side plate of the volute (1) is provided with a limiting hole (111) penetrating from front to back, for the lock piece (43) to pass through, the locking knob (4) has at least a locking state in which the lock piece (43) is limited on the rear side of the peripheral edge of the limiting hole (111) to limit the lock piece (43) from coming out of the limiting hole (111) forward, and an unlocking state in which the lock piece (43) is moved to the position opposite to the limiting hole (111) to allow the lock piece (43) to come out of the limiting hole (111) forward, according to the change of the rotating position of the connecting ring (32).

9. The centrifugal fan of claim 8, wherein: The connecting ring (32) is further provided with a first positioning socket (113) on the front side plate of the volute (1) for the pin (322) to insert into.

10. The centrifugal fan of claim 9, wherein: The positions of the pin (322) on the connecting ring (32) and the locking knob (4) are respectively located on opposite sides of the connecting ring (32).

11. The centrifugal fan of claim 8, wherein: The front side plate of the volute (1) is further provided with two positioning protrusions on the side wall surface towards the volute (1), which are arranged along the circumference of the locking knob (4) at intervals, and the limiting buckle (45) of the lock piece (43) is limited between the two positioning protrusions when the locking knob (4) is in the locking state.

12. A range hood comprising a housing (5) and a centrifugal fan arranged in the housing (5), characterized in that: The centrifugal fan adopts the centrifugal fan according to any one of claims 8-11.

13. The hood according to claim 12, characterized in that: The shell (5) comprises a front panel (51) having a third mounting opening (511) opposite to the air inlet (110) of the volute (1), the connecting ring (32) of the current collector abutting against the front side of the peripheral edge of the third mounting opening (511), and a first through hole (512) is formed in the peripheral edge of the third mounting opening (511) for the lock member (43) and the lock rod (46) to pass through, and the first through hole (512) is opposite to the limiting hole (111).

14. The hood according to claim 13, characterized in that: Further comprising a sealing ring (52) arranged between the peripheral edge of the third mounting opening (511) of the front panel (51) and the front side plate of the volute (1).

15. The hood according to claim 14, characterized in that: The peripheral edge of the air inlet (110) of the front side plate of the volute (1) has a second folded edge (114) folded forward, the inner side edge of the sealing ring (52) has a protruding portion (521) protruding to the side, so that the cross section of the sealing ring (52) is stepped, and the protruding portion (521) of the sealing ring (52) is clamped between the second folded edge (114) and the peripheral edge of the third mounting opening (511) of the front panel.

16. The hood according to claim 15, characterized in that: In the installed state of the current collector, the side of the connecting ring (32) facing the volute (1) is in contact with the protruding portion (521) of the sealing ring (52).

17. The hood according to claim 14, characterized in that: The side of the sealing ring (52) facing the volute (1) has at least two positioning columns (522) arranged in sequence in the circumferential direction, and the front side plate of the volute (1) has at least two positioning holes (115) for the positioning columns (522) to be correspondingly clamped therein.

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