CN217977466U - Current-limiting air door structure - Google Patents

Abstract

The application discloses current-limiting air door structure, including setting up the current-limiting subassembly on the valve body, the current-limiting subassembly is suitable for the maximum amount of wind that changes the airflow channel in the blast gate, when airflow channel opens, the air door is suitable for cooperation current-limiting subassembly to form the eye of keeping away from the airflow channel edge in airflow channel department, the amount of wind that the current-limiting air door structure can be exported according to the rated flow current limit blast gate of gas, let the proportion between the maximum amount of wind of blast gate output and the maximum gas flow of gas valve output keep unanimous, promote the uniformity of blast gate ratio, can also make the amount of wind of blast gate output change more evenly, further promote the precision of amount of wind regulation, make the blast gate ratio more perfect, guarantee the abundant degree of gas burning.

Description

Current-limiting air door structure

Technical Field

The application relates to the technical field of gas equipment, in particular to a current-limiting air door structure.

Background

The blowing type gas burner is equipment for mixed combustion of oxygen and gas by forced oxygen supply of an air blower, the waste gas discharge capacity and various indexes of the commercial blowing type gas burner are set only aiming at the combustion working condition of a big fire in the existing national standard, and the indexes of the combustion working condition of each section of a middle-small fire are not set, so that the phenomenon of excessive air quantity is easily generated under the conditions of different fire conditions except the big fire for most products on the market, the gas combustion is insufficient, the discharge quantity of carbon monoxide exceeds the standard, the air environment is polluted, and the gas is wasted.

In order to solve this problem, an air valve is usually disposed between the blower and the burner for controlling the amount of air supplied from the blower to the burner.

However, the air volume control of the conventional gas equipment has the following defects: at present, most air valves are manual, when the manual air valves are used, the manual air valves and the gas valves need to be adjusted at the same time, both hands are occupied, meanwhile, the visual field is influenced by an iron pan, the working conditions of the fire are not easy to see clearly, the operation is inconvenient, the adjustment is not easy to synchronize and not accurate enough, and the air and gas proportioning cannot be realized well; in addition, some air valves with electric control structures generally have the problems of unstable combustion working conditions, high failure rate and high product cost.

Disclosure of Invention

One object of the present application is to provide an air-linked proportional valve that enables proportional synchronous regulation of air supply within a rated gas flow rate.

Another object of the present application is to provide a linkage proportional air valve which can synchronously adjust and supply the air volume in proportion to the gas flow within the rated gas flow.

It is yet another object of the present application to provide a variable speed damper controller capable of proportional stepless regulation of damper air volume.

Still another object of this application is to provide a current-limiting air door structure that can be according to the rated flow current limit blast gate amount of gas.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a flow-limiting air door structure comprises a flow-limiting assembly arranged on a valve body, wherein the flow-limiting assembly is suitable for changing the maximum air quantity of an air flow channel in an air valve, and when the air flow channel is opened, an air door is suitable for being matched with the flow-limiting assembly to form an air eye far away from the edge of the air flow channel at the air flow channel.

As an improvement, the flow limiting assembly comprises a flow limiting tongue plate, the flow limiting tongue plate is arranged in the airflow channel, the lower portion of the flow limiting tongue plate is suitable for being attached to the outer surface of the air door, a first arc-shaped portion is arranged at the end portion of the flow limiting tongue plate, a second arc-shaped portion is arranged on the opening and closing side of the air door, and the shape of the first arc-shaped portion is matched with the shape of the second arc-shaped portion.

As an improvement, a mounting opening is formed in one side of the valve body, the flow limiting tongue plate is suitable for being embedded into the airflow channel from the mounting opening and extending into the airflow channel, and the width of the flow limiting tongue plate is not larger than the diameter of the airflow channel.

As an improvement, the air door is provided with a containing part which is suitable for being matched with the flow limiting assembly to form an opening idle stroke before the air flow passage is opened.

As an improvement, the air door is provided with an accommodating part, and the accommodating part is suitable for being matched with the flow limiting tongue plate to form an opening idle stroke before the air flow channel is opened.

As a refinement, the shape of the damper on the opposite side of the open-close side is the same as the shape of the flap projected to the damper, and the opposite side of the open-close side of the damper is adapted to overlap the flap when the airflow passage is fully open.

Compared with the prior art, the beneficial effect of this application lies in: the air quantity of the rated flow current-limiting air valve output of this product can be according to the rated flow current-limiting air valve output of gas, let the proportion between the maximum amount of wind of air valve output and the maximum gas flow of gas valve output keep unanimous, promote the uniformity of wind-gas ratio, the current-limiting air valve structure can also make the amount of wind of air valve output change more evenly, further promotes the accurate nature of air regulation, makes the wind-gas ratio more perfect, guarantees the abundant degree of gas burning.

Drawings

FIG. 1 is a schematic view of a damper according to a preferred embodiment of the present application in an open configuration;

FIG. 2 is a disassembled structural view of the damper according to a preferred embodiment of the present application;

FIG. 3 is an overall structural view of a valve cartridge according to a preferred embodiment of the present application;

FIG. 4 is an internal structural view of a transmission according to a preferred embodiment of the present application;

FIG. 5 is a top view of a damper according to a preferred embodiment of the present application;

FIG. 6 is a right side view of a damper according to a preferred embodiment of the present application;

FIG. 7 isbase:Sub>A cross-sectional view of the damper of FIG. 6 taken along A-A as shown in an open position, according tobase:Sub>A preferred embodiment of the present application;

FIG. 8 isbase:Sub>A cross-sectional view of the damper of FIG. 6 taken along the line A-A when closed in accordance withbase:Sub>A preferred embodiment of the present application;

FIG. 9 is an overall structural view of an end cap according to a preferred embodiment of the present application;

fig. 10 is a schematic view of a damper according to a preferred embodiment of the present application when closed.

In the figure: 1. a valve body; 11. an air flow channel; 111. a wind eye; 12. an installation port; 2. a valve core; 21. a damper; 211. a containing section; 212. a second arcuate portion; 3. a controller; 31. a rotating shaft; 32. a transmission; 321. a transmission member; 3211. an input shaft; 3212. a guide rod; 322. a transmission member; 323. a driven wheel; 33. a linkage assembly; 331. a first link; 332. a second link; 4. an end cap; 41. a first guide groove; 42. a second guide groove; 43. a depressed portion; 5. a mounting plate; 6. a current limiting assembly; 61. a flow restrictor flap; 611. a first arcuate portion.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The present application is further described with reference to the accompanying drawings:

as shown in fig. 1 to 10, a preferred embodiment of the present application includes an air valve and a gas valve connected to a burner, preferably a blast type gas burner such as a chinese meal gas cooking range, a cooking gas cooking range, a gas cooking oven, a gas industrial furnace, and the like.

The air valve is connected with an air supply device for forcibly supplying oxygen, and can be a blower, a booster pump, an air pump and other devices, the air valve is suitable for supplying air quantity to a combustor through the air supply device, the gas valve is suitable for supplying gas to the combustor, the air valve comprises a valve body 1, a valve core 2 and a controller 3, the valve body 1 is provided with an air flow channel 11, the air flow channel 11 is connected with an air inlet and an air outlet on the valve body 1, the valve core 2 can be opened and closed at any position (including the air inlet and the air outlet) of the air flow channel 11, the valve core 2 is arranged in the valve body 1, the gas valve is provided with a valve, the controller 3 is suitable for enabling the valve core 2 to open and close the air flow channel 11 along with the opening and closing of the valve, before the valve core 2 completely opens the air flow channel 11, the ratio of the opening and closing speed of the valve core 2 to the opening and closing speed of the valve is alpha, alpha is not equal to 1, and when the alpha is smaller than 1, the opening and closing speed of the valve core 2 is smaller than the opening and closing speed of the air flow channel 11; when α is larger than 1, the opening/closing speed of the valve element 2 is larger than the opening/closing speed of the valve, and the ratio of the opening/closing speed of the valve element 2 to the opening/closing speed of the valve is preferably 3.

Linkage through blast gate and gas valve combines, the amount of wind with the blast gate is correlated with the gas flow of gas valve, liberation both hands, only need operate the gas valve can carry out the linkage regulation of wind gas simultaneously, need not to observe the duration and degree of heating condition, easy operation is convenient not hard, change proportion has between blast gate and the gas valve, can carry out the ratio to wind gas and supply with the transport, make the combustor all have stable burning operating mode under different duration and degree of heating conditions, the burning of gas is more abundant, can save fuel and environmental protection.

The valve core 2 can realize the opening and closing control of the air flow channel 11 in a rotating opening or flat opening mode.

When case 2 was the mode of rotating and opening, case 2 rotated and sets up in valve body 1, and the valve rotation sets up on the gas valve, and controller 3 is suitable for making case 2 carry out the rotation that the slew velocity is different but the velocity ratio size is unchangeable according to the slew velocity of valve, is provided with air door 21 on case 2, and case 2 is suitable for to rotate and makes air door 21 open or close airflow channel 11, and when the gas flow of gas valve reached the required biggest gas flow of combustor, air door 21 was suitable for and opens airflow channel 11 completely.

The change of the opening and closing speed of the valve core 2 and the valve opening and closing speed can be regarded as the change of the rotation angular speed of the valve core 2 and the valve of the gas valve, so that the ratio of the rotation angular speed of the valve core 2 and the valve of the gas valve is beta, beta is more than or equal to 2 and less than or equal to 3.5, and the most preferable value of beta is 3, and the rotation speed can be adjusted by changing the speed change efficiency of the transmission 32 or the parameters of the length, the shape, the angle and the like of the linkage assembly 33, so that the adaptability to different combustors is improved.

The gas valve preferably uses a gas ball valve, and only two types of ball valves and plug valves are selected according to the relevant national standard regulation on the gas supply valve of the commercial gas stove, and the plug valves have small flow rate and are not suitable for commercial blowing type gas burners, so the gas ball valve and the air valve are preferably combined to realize proportional linkage of air and gas.

The valve of gas valve and the case 2 of blast gate all set up to the form of rotating the switching, make valve and case 2 can make under the rotation angle who opens is the change of proportion and also have comparatively close proportion between gas flow and the amount of wind through both, increase the ratio precision of gas flow and the amount of wind, promote the stability of gas burning operating mode.

Because the wind speed in the blast gate is very fast, case 2 need can all keep the stability of case 2 under the condition that airflow channel 11 opened arbitrary size when the cooperation was out wind with airflow channel 11, avoided airflow channel 11 to neglect the stability that influences the gas combustion operating mode suddenly, therefore case 2 and the form of valve body 1 rotation connection can promote the operating stability of case 2, simple to operate simultaneously, the fault rate is lower.

As shown in fig. 1 to 4, the controller 3 includes a rotation shaft 31 and a transmission 32, the rotation shaft 31 connects the valve body 2 and the transmission 32, the rotation shaft 31 is disposed along a rotation axis of the valve body 2, the transmission 32 is adapted to amplify a rotation angle of the valve, and the transmission 32 is adapted to drive the rotation shaft 31 to rotate the valve body 2 through the amplified rotation angle of the valve.

According to the pressure and flow requirements of commercial gas stoves, 4-minute ball valves are generally used, if extra-large flow can also be used, 6-minute ball valves are also used, the movement track of the valves of the gas valves from opening to closing is usually 90 degrees, but the rated gas flow of a burner is limited by a nozzle in the burner, the maximum flow required by combustion of one burner is required to be achieved, the valve of the gas valve can be basically met only by opening about 30 degrees, when the angle is exceeded, the rotation of the gas valve is idle stroke, the air volume is input into the air valve by a blower, if the air valve and the gas valve rotate synchronously, when the rotation track of the air valve passes through one third, the output air volume is far less than the air volume required by the gas, and therefore, the air valve needs to be accelerated in the process of rotating synchronously with the gas valve.

The derailleur 32 that sets up between axis of rotation 31 of case 2 and the valve can accelerate speed up case 2's rotation orbit, let the gas valve when reaching the required maximum flow of combustor burning, case 2 can follow the gas valve and open the airflow channel 11 of blast gate completely, satisfy the burning under the big fire condition and use, derailleur 32 can let the gas valve rotate the angle of opening and shutting before reaching the required maximum flow of combustor burning and be fixed proportion with case 2 simultaneously, let gas flow and amount of wind can stably keep fixed ratio under the condition of middle and small fire, promote the combustion efficiency of gas, make its burning more abundant, can stabilize the burning operating mode of combustor simultaneously, avoid flame to neglect greatly.

Be provided with linkage assembly 33 between derailleur 32 and the valve, when the valve rotated, linkage assembly 33 was suitable for and drives axis of rotation 31 through derailleur 32 and rotates simultaneously, through derailleur 32 and linkage assembly 33's cooperation, realized the synchronous proportion rotation of case 2 and valve, reduced the operation degree of difficulty of blast gate and gas valve, realized the automatic ratio of wind gas.

The transmission 32 comprises a speed changing part 321 and at least one transmission part 322, the transmission part 322 is connected with the speed changing part 321 and the rotating shaft 31, an input shaft 3211 is arranged on the speed changing part 321, the input shaft 3211 is connected with the linkage assembly 33, the speed changing part 321 is suitable for being matched with the transmission part 322 to convert a moving path of the input shaft 3211 into a rotating path of the rotating shaft 31, the linkage assembly 33 can convert and amplify the rotation of the valve into the moving path, the transmission 32 can be converted onto the rotating shaft 31 in an equal ratio mode according to the amplified moving path, proportional synchronous rotation between the valve and the rotating shaft 31 is achieved, and the transmission 32 can be arranged in the valve body 1 or outside the valve body 1 according to an air valve structure.

When derailleur 32 sets up in valve body 1, speed change spare 321 includes the transmission circle, the transmission circle uses axis of rotation 31 to inlay in valve body 1 as axle center pivoted, driving medium 322 includes the drive wheel, the cover is equipped with from the driving wheel 323 on the axis of rotation 31, the drive wheel is suitable for the transmission to enclose and from the rotation between the driving wheel 323, integrate derailleur 32 to valve body 1 in, make the structure of blast gate compacter, can realize the variable speed control to case 2 under the long-pending condition of need not to increase the blast gate body 1, reduce the demand of blast gate to installation space size.

As shown in fig. 9, the valve body 1 is provided with an end cover 4, the end cover 4 is suitable for shielding and fixing the transmission 32, and the end cover 4 is used for protecting and stabilizing the structure of the transmission 32.

The end cover 4 is provided with a first guide groove 41 arranged along the moving path of the input shaft 3211, the input shaft 3211 is suitable for passing through the first guide groove 41 to be connected with the linkage assembly 33, the first guide groove 41 can limit and protect the moving path of the input shaft 3211, and the stability of the operation of the transmission 32 and the linkage structure is improved.

Be provided with guide bar 3212 on the drive ring, set up the second guide slot 42 that sets up along guide bar 3212 activity route on the end cover 4, guide bar 3212 is suitable for and slides in second guide slot 42, second guide slot 42 can restrict and protect guide bar 3212's activity route, guide bar 3212 is preferred and input shaft 3211 along the axis symmetry of axis of rotation 31, can promote the stability of derailleur 32 operation, avoid derailleur 32 to take place the operation card scheduling problem because of the atress is uneven in the linkage process.

The end cover 4 is provided with the sunken part 43 at the outer side of the first guide groove 41 and the second guide groove 42, so that the structural strength of the first guide groove 41 and the second guide groove 42 is ensured, the volume of the end cover 4 can be reduced, the weight of the end cover 4 is reduced, the cost is saved, and the air valve is lightened

But centre gripping fixed mounting plate 5 between end cover 4 and the valve body 1, mounting plate 5 can be connected with supports such as complete machine equipment, realizes the fixed of blast gate.

The structure of derailleur 32 can use multiple transmission structure such as gear drive structure, worm gear drive structure, belt drive structure, chain drive structure, prefers to use the gear rotation structure, and the transmission process is more accurate stable, and the durability is strong, difficult trouble.

The driving wheels can be connecting shaft gears, the number of the driving wheels is preferably two, the driving wheels are symmetrically arranged along the axis of the rotating shaft 31, the connecting shaft gears can be connected with the end cover 4 to improve stability, the two connecting shaft gears can further improve operation stability, the driving ring preferably adopts an inner gear ring, the connecting shaft gears serve as intermediate gears, and the driven wheel 323 is in toothed connection with the driving wheels and the driving ring.

The blast gate is preferred to use three blast gates, and controller 3 can set up in the surplus passage mouth of three blast gates except that air intake and air outlet, simple to operate, and compact structure is stable, can not occupy too much space because of the volume that increases the blast gate, increases the adaptability to the installation environment.

The linkage assembly 33 comprises a first connecting rod 331 and a second connecting rod 332, the first connecting rod 331 and the second connecting rod 332 are hinged to each other, the first connecting rod 331 rotates along with the valve, the second connecting rod 332 is connected with the speed changer 32, the first connecting rod 331 is suitable for driving the second connecting rod 332 to move and enabling the speed changer 32 to operate through rotation, connection between the speed changer 32 and the valve can be guaranteed to be more stable through mechanical connection, the linkage assembly 33 can be arranged at any position within 360 degrees of the rotating shaft 31, only the length and the included angle of the first connecting rod 331 and the second connecting rod 332 need to be adjusted, and the first connecting rod 331 can enable the second connecting rod 332 to move between two movable point positions no matter the first connecting rod 331 rotates forwards or reversely.

When the valve core 2 is in a flat-open mode, the rotary motion of the valve can be converted into the smooth motion of the valve core 2 through structures such as a gear rack and the like, so that the change control of the opening size of the air flow channel 11 is realized, and the linkage acceleration or deceleration equal to the opening and closing speed of the valve core 2 and the valve can also be realized.

As shown in fig. 5 to 8, a flow limiting assembly 6 is further disposed on the valve body 1, and the flow limiting assembly 6 is adapted to change the maximum air volume of the airflow channel 11, and can set a flow limiting according to the rated gas flow, so as to ensure that the maximum air volume of the airflow channel 11 can keep a proportion to the rated maximum gas flow used by the burner.

As shown in fig. 5, when the airflow channel 11 is opened, the damper 21 is adapted to cooperate with the flow limiting assembly 6 to form the air eye 111 far away from the edge of the airflow channel 11 at the airflow channel 11, so as to prevent the air outlet surface of the air eye 111 from being too small when the air eye 111 is formed by opening the damper 21 at the edge of the airflow channel 11, and thus the change of the air outlet surface of the air eye 111 in the process of expanding is more uniform.

The flow limiting assembly 6 comprises a flow limiting tongue plate 61, the flow limiting tongue plate 61 is arranged in the airflow channel 11, the lower part of the flow limiting tongue plate 61 is suitable for being attached to the outer surface of the air door 21, and the matching sealing performance between the flow limiting tongue plate 61 and the air door 21 can be improved when the air door 21 closes the airflow channel 11.

The end of the flow-limiting tongue plate 61 may be provided with a first arc-shaped portion 611, opposite to which the opening and closing side of the damper 21 needs to be provided with a second arc-shaped portion 212, the shape of the first arc-shaped portion 611 and the shape of the second arc-shaped portion 212 are matched with each other, the first arc-shaped portion 611 may be an arc-shaped protrusion or an arc-shaped recess, that is, when the first arc-shaped portion 611 is an arc-shaped protrusion, the second arc-shaped portion 212 is an arc-shaped recess; when first arc portion 611 is the arc sunken, second arc portion 212 is the arc protruding, because airflow channel 11 is circular usually, the setting up of first arc portion 611 and second arc portion 212 can make the switch progress of wind eye 111 more close to rounding off, lets airflow channel 11 open the width of a cloth process more even, promotes the homogeneity that the amount of wind changes, and then promotes the blast gate to the accurate nature of amount of wind control.

Installing port 12 has been seted up to valve body 1 one side, current-limiting tongue plate 61 is suitable for from installing port 12 embedding and extend to in the airflow channel 11, current-limiting tongue plate 61 can dismantle with valve body 1 and be connected, an mounting means of current-limiting tongue plate 61 does, install the clamp plate at the afterbody of current-limiting tongue plate 61, insert in the valve body with current-limiting tongue plate 61 outside valve body 1, around the installing port 12 in the 1 outside of valve body of clamp plate fixed connection, realize the fixed positioning to current-limiting tongue plate 61 through the clamp plate, the convenient current-limiting tongue plate 61 of different specifications is installed in a flexible way according to the rated maximum gas flow of combustor, realize the regulation and the change to airflow channel 11's the biggest air output.

The width of the restrictor plate 61 is preferably not greater than the diameter of the airflow channel 11, which can reduce the difficulty in machining the mounting opening 12 in the valve body 1.

The open-close side of the air door 21 is provided with a containing part 211, when the valve body 1 is not provided with the flow limiting assembly 6, the containing part 211 is suitable for being matched with the valve body 1 to form an open idle stroke before the air flow channel 11 is opened, when the flow limiting assembly 6 is arranged in the valve body 1, the containing part 211 is suitable for being matched with the flow limiting assembly 6 to form an open idle stroke before the air flow channel 11 is opened, a section of idle stroke is usually generated when the gas valve is just opened, in order to enable the air valve to be opened and the gas valve to be synchronous, the air door 21 is also provided with the containing part 211 to form the same section of idle stroke, and the use safety is improved.

The shape of the opposite side of the opening and closing side of the air door 21 is the same as the shape of the projection of the flow limiting tongue plate 61 to the air door 21, when the air door 21 is rotated and opened to the maximum angle, the side of the air door 21 can be completely overlapped with the flow limiting tongue plate 61, the side cannot interfere with the air flow channel 11 or the flow limiting tongue plate 61 in the rotation process of the air door 21, the passing of the air flow is influenced, and the stability of the passing air flow of the air flow channel 11 after the air flow channel is completely opened is ensured.

The operation principle is as follows: when the gas valve is closed, the air door 21 in the air valve closes the air flow channel 11, when the valve of the gas valve is opened, the valve is in an idle stroke state at the beginning, in the process that the valve drives the air door 21 to move through the controller 3, the containing part 211 of the air door 21 and the flow limiting tongue plate 61 on the valve body 1 are matched and located in the idle stroke state, the air flow channel 11 is in a closed state in the idle stroke state, the valve is continuously rotated, the gas flow passes through the opened valve, the air door 21 opens the air flow channel 11, the air door 21 and the flow limiting assembly 6 are matched to form an air eye 111, the air volume is provided for the burner through the air eye 111, when the valve rotates to about 30 degrees, the valve core 2 synchronously rotates 90 degrees, at the moment, the air flow channel 11 is completely opened, the valve continuously rotates and cannot influence the maximum rated gas flow required by the burner, the air door 21 on the valve core 2 cannot influence the air flow channel 11, the air volumes of the two air volumes enter the idle stroke, the maximum rotation angle of the valve is generally 90 degrees, and the valve core 2 can synchronously rotate to 270 degrees.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and such changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (6)

1. A structure of a flow-limiting damper is characterized in that: the air valve comprises a flow limiting assembly arranged on a valve body, wherein the flow limiting assembly is suitable for changing the maximum air quantity of an air flow channel in the air valve, and when the air flow channel is opened, an air door is suitable for being matched with the flow limiting assembly to form an air eye far away from the edge of the air flow channel at the air flow channel.

2. A restrictor damper structure as claimed in claim 1, wherein: the flow limiting assembly comprises a flow limiting tongue plate, the flow limiting tongue plate is arranged in the airflow channel, the lower portion of the flow limiting tongue plate is suitable for being attached to the outer surface of the air door, a first arc-shaped portion is arranged at the end portion of the flow limiting tongue plate, a second arc-shaped portion is arranged on the opening and closing side of the air door, and the shape of the first arc-shaped portion is matched with the shape of the second arc-shaped portion.

3. A restrictor damper structure as claimed in claim 2, wherein: and a mounting opening is formed in one side of the valve body, the flow-limiting tongue plate is suitable for being embedded into the airflow channel from the mounting opening and extending into the airflow channel, and the width of the flow-limiting tongue plate is not larger than the diameter of the airflow channel.

4. A restrictor damper structure as claimed in claim 1, wherein: the air door is provided with an accommodating part, and the accommodating part is suitable for being matched with the flow limiting assembly to form an opening idle stroke before the air flow channel is opened.

5. A restrictor damper structure as claimed in claim 2, wherein: the air door is provided with an accommodating part, and the accommodating part is suitable for being matched with the flow limiting tongue plate to form an opening idle stroke before the airflow channel is opened.

6. A restrictor damper structure as claimed in claim 2, wherein: the shape of the air door on the opposite side of the opening and closing side is the same as the shape of the position projected to the air door by the flow limiting tongue plate, and when the airflow channel is completely opened, the opposite side of the opening and closing side of the air door is suitable for being overlapped with the flow limiting tongue plate.

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