CN220505403U - Venturi tube assembly, fan assembly and wall-mounted furnace - Google Patents

Abstract

The utility model relates to the technical field of fans, and discloses a venturi tube assembly, a fan assembly and a wall-mounted stove, wherein the venturi tube assembly is arranged at an air outlet of the fan and comprises: the venturi tube is internally provided with an air duct communicated with the inner cavity of the fan, and the air duct is provided with an air inlet and an air outlet; the insect prevention piece is arranged at the air inlet and/or the air outlet of the venturi tube, the insect prevention piece can seal the air duct in a natural state, and the air duct can be opened under the action of wind power of the fan. According to the utility model, the opening and closing movement of the insect prevention member is controlled by the wind power of the fan and the gravity and/or the elastic force of the insect prevention member, so that the problems that mosquitoes, spiders and the like climb into the Venturi tube easily to influence ventilation of the air duct and block the air duct can be solved, the opening and closing of the insect prevention member are synchronous with the operation of the fan, and the problems of related potential safety hazards caused by delayed opening and closing or early opening and closing of the insect prevention member are effectively avoided.

Description

Venturi tube assembly, fan assembly and wall-mounted furnace

Technical Field

The utility model relates to the technical field of fans, in particular to a venturi tube assembly, a fan assembly and a wall-mounted boiler.

Background

The wall-mounted furnace is used by more families because of the advantages of free heating time, safety, saving, high safety and the like. However, after the heating season is finished, the machine can be not used for a long time, mosquitoes, spiders and the like can climb into the venturi tube of the fan from the smoke pipe, the problem of blockage is caused by nest making in the venturi tube, the venturi tube can influence equipment wind pressure detection once being blocked, the machine unit can report wind pressure faults and can not be started for use, the use experience of a user is seriously influenced, and if the venturi tube of the centrifugal fan is blocked, the machine can only be manually disassembled for dredging, so that the machine is troublesome, and the maintenance cost is relatively high.

Disclosure of Invention

In view of the above, the utility model provides a venturi tube assembly, a fan assembly and a wall-mounted furnace, so as to solve the problem that mosquitoes, spiders and the like in the prior art climb into a venturi tube of a fan from a smoke tube opening of the wall-mounted furnace, and nest in the venturi tube to cause blockage.

In a first aspect, the present utility model provides a venturi assembly disposed at an exhaust outlet of a blower, the venturi assembly comprising:

the venturi tube is internally provided with an air duct communicated with the inner cavity of the fan, and the air duct is provided with an air inlet and an air outlet;

the insect prevention piece is arranged at the air inlet and/or the air outlet of the venturi tube, the insect prevention piece can seal the air duct in a natural state, and the air duct can be opened under the action of wind power of the fan.

The beneficial effects are that: the insect prevention device has the advantages that the opening and closing movement of the insect prevention piece is controlled by means of the wind force of the fan and the gravity and/or the elastic force of the insect prevention piece, the purpose that foreign objects enter the venturi tube is achieved, the anti-blocking effect is achieved, the problems that mosquitoes, spiders and the like climb into the venturi tube easily to influence ventilation of an air duct and block the air duct can be solved, the opening and closing of the insect prevention piece are synchronous with the operation of the fan, the problem that the insect prevention piece is delayed in opening and closing or the insect prevention piece is delayed in advance to cause the insect prevention piece to climb into the venturi tube while the insect prevention piece is in advance, the venturi tube is blocked, or wind pressure detection cannot be normally conducted, and related potential safety hazards such as wind pressure faults can be reported.

Compared with the existing insect prevention structure of the insect prevention net type, the insect prevention mode of the venturi tube assembly provided by the embodiment is less prone to gathering impurities, even if impurity dust is gathered on the insect prevention piece, normal ventilation of the air duct during equipment starting cannot be affected, the anti-blocking air duct effect is better, and the venturi tube is better protected.

Compared with the insect prevention structure of the existing motor-driven insect prevention part opening and closing, the insect prevention mode of the venturi tube assembly provided by the embodiment realizes the opening and closing of the insect prevention part by means of wind force of the fan, a driving mechanism is not required to be additionally arranged to drive the insect prevention part to open and close, the cost is lower, the insect prevention part is easier to use and popularize, the opening and closing synchronism and consistency of the insect prevention part and the fan are better, and the problem of related potential safety hazards caused by the fact that the insect prevention part is opened and closed by the motor-driven insect prevention mode in the related art is effectively solved, and the opening and closing of the insect prevention part is delayed or opened and closed in advance.

In an alternative embodiment, the insect-preventing member includes:

the air inlet insect prevention piece is arranged at the air inlet of the venturi tube, can seal the air inlet in a natural state, and can open the air inlet under the action of wind power of the fan;

the air outlet insect prevention piece is arranged at the air outlet of the Venturi tube, can seal the air outlet in a natural state, and can open the air outlet under the action of wind power of the fan.

The beneficial effects are that: through set up air inlet insect prevention spare and air-out insect prevention spare respectively with air intake and air outlet, can effectually avoid foreign matter, little worm etc. to enter into venturi from venturi's air intake or air outlet in, insect prevention effect is better.

In an alternative embodiment, the insect-preventing member includes:

a mounting portion adapted to be detachably mounted and fixed to the venturi tube;

the blocking part is movably connected with the mounting part, and can open the air duct under the action of wind pressure when the fan is started; when the fan is closed, the blocking part can reset to the position for closing the air duct under the action of self gravity and/or elastic force.

The beneficial effects are that: the installation department is fixed on venturi through detachably installation, makes things convenient for the dismouting to change, also makes things convenient for simultaneously overhauling the maintenance to venturi inside. The plugging part is movably connected with the mounting part, so that the plugging part moves under the action of wind pressure, self gravity and elasticity more easily.

In an alternative embodiment, the mounting portion is adapted to be secured to the end of the venturi tube by a ferrule, and the blocking portion is a blocking tab connected to the mounting portion.

The beneficial effects are that: the installation department passes through the mode installation of cutting ferrule and fixes on venturi's tip, and the dismouting is more swift, and the shutoff portion through the structure that adopts the shutoff piece of being connected with the installation department for insect proof spare is opened under the effect of wind pressure more easily, and through adopting elastic connection's mode, makes the shutoff piece can be under the effect of elasticity automatic re-setting.

In an alternative embodiment, the cross-sectional shape and size of the blocking piece matches the cross-sectional shape and size of the air duct, and one side of the blocking piece is elastically connected to the mounting portion.

The beneficial effects are that: the inner periphery cross section in wind channel is circular, and the shutoff piece then sets up to the circular form that matches with it to realize that the shutoff piece can seal the wind channel, prevent that the foreign matter from getting into, and in this embodiment, elastic connection between one side and the installation department of shutoff piece, thereby make the fan when starting the shutoff piece can be opened under the effect of wind pressure more easily.

In an alternative embodiment, the sealing piece at least comprises two flaps, the at least two flaps are respectively connected with the mounting part, and the at least two flaps are suitable for being matched with each other to open or close the air duct.

The beneficial effects are that: the multi-flap plugging piece can be mutually spliced to form a closed structure matched with the cross section of the air inlet or the air outlet of the air duct in size, and the plugging piece is designed into the multi-flap structure, so that compared with the integrated structure, when the insect prevention piece is opened, the air does not need to overcome the gravity and/or the elasticity of the whole plugging part, and the air can open the plugging part only by overcoming the original half or less than half of the gravity and/or the elasticity, so that the insect prevention piece is easier to open, the loss of wind energy can be effectively reduced, and the influence of the insect prevention piece on the wind speed and the wind flow can be reduced.

In an alternative embodiment, the insect prevention member is an elastic member.

The beneficial effects are that: the insect prevention piece is made of elastic materials, so that the blocking part can reset and close the air duct in the Venturi tube under the combined action of elasticity or elasticity and gravity, and the air duct is easier to reset.

In an alternative embodiment, the venturi comprises:

the venturi tube main body comprises an air inlet section, a reducing section, a throat and an air outlet section which are sequentially arranged along the air flow direction;

the positive pressure detection pipe is communicated with the air inlet section, and the negative pressure detection pipe is communicated with the throat.

The beneficial effects are that: the positive pressure detecting tube and the negative pressure detecting tube are arranged in parallel, and the positive pressure detecting tube and the negative pressure detecting tube are arranged to facilitate connection with the wind pressure detecting switch, so that wind pressure in the fan is detected.

In a second aspect, the present utility model also provides a fan assembly comprising a fan and a venturi assembly according to any of the embodiments described above;

the fan comprises a fan shell, an air inlet and an air outlet are formed in the fan shell, and the venturi assembly is arranged at the position, close to the air outlet, of the fan shell.

In a third aspect, the utility model also provides a wall-mounted furnace, which comprises a shell, a combustion chamber arranged in the shell and the fan assembly;

wherein, the air inlet of fan communicates with the exhaust port of combustion chamber, and the exhaust port of fan communicates with the exhaust structure on the casing.

In an alternative embodiment, the venturi of the venturi assembly is disposed vertically with the air inlet of the venturi facing downward.

The beneficial effects are that: the installation in the complete machine is to guarantee that venturi is vertical to the air intake is down, and so the design ensures that the fan is when opening, can open air inlet protection against insects spare and air-out protection against insects spare, and the fan is when closing, and air inlet protection against insects spare and air-out protection against insects spare can fall the automatic problem that resets to seal air intake and air outlet under the effect of gravity, avoid elasticity not enough, air inlet protection against insects spare and air-out protection against insects spare reset difficulty.

In an alternative embodiment, the wall hanging stove further comprises:

the wind pressure detection switch is arranged in the shell and is used for detecting the wind pressure of the fan, and the wind pressure detection switch is provided with a positive pressure detection port and a negative pressure detection port;

wherein, the positive pressure detection mouth is suitable for the positive pressure detection pipe intercommunication with venturi, and the negative pressure detection mouth is suitable for the negative pressure detection pipe intercommunication with venturi.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a wall-mounted boiler in an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a fan assembly in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic illustration of the inlet and outlet air insect prevention members of a venturi assembly according to one embodiment of the present utility model in a closed position;

FIG. 4 is a schematic view of the venturi assembly with the inlet and outlet insect prevention members in an open position;

FIG. 5 is a schematic view of an embodiment of the utility model in which the inlet and outlet air insect prevention members of the venturi assembly are open;

FIG. 6 is a schematic view of the structure of a venturi body according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of an embodiment of an air intake insect prevention member according to the present utility model;

FIG. 8 is a schematic diagram of an embodiment of an air-out insect prevention member according to the present utility model;

reference numerals illustrate:

10. a fan assembly;

11. a blower; 110. an air outlet;

12. a venturi assembly;

121. a venturi tube; 1211. a venturi body; 12111. an air inlet section; 12112. a reducing section; 12113. a throat; 12114. an air outlet section; 1212. a positive pressure detection tube; 1213. a negative pressure detection tube; 1214. a connecting plate;

122. an air inlet insect prevention piece; 1221. a first mounting portion; 12211. a first intermediate support portion; 1222. a first blocking portion; 12221. a first flap closure flap; 12222. a second flap closure flap; 1223. a supporting and limiting part;

123. an air outlet insect prevention piece; 1231. a second mounting portion; 12311. a second intermediate support portion; 1232. a second blocking portion; 12321. a third flap closure flap; 12322. a fourth flap closure flap;

13. a motor;

20. a wall-mounted furnace; 21. a housing; 22. a combustion chamber; 23. a smoke exhausting structure; 24. and a wind pressure detection switch.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The wall-mounted furnace is used by more families because of the advantages of free heating time, safety, saving, high safety and the like. However, after the heating season is finished, the machine can be not used for a long time, mosquitoes, spiders and the like can climb into the venturi tube of the fan from the smoke pipe, the problem of blockage is caused by the fact that the nest is formed in the venturi tube, the wind pressure detection of equipment can be influenced once the venturi tube is blocked, the machine unit can report wind pressure faults and can not be started up for use, the use experience of a user is seriously influenced, if the venturi tube of the centrifugal fan is blocked, the machine can only be manually disassembled for dredging, and the machine is not only troublesome, but also the maintenance cost is relatively high.

In the related art, most insect prevention is carried out by adopting an insect prevention net, however, the insect prevention net has a plurality of impurities and dust attached to the insect prevention net after long-term use, so that the impurities are easy to gather, the air quantity of an air duct is influenced, and even the air duct is blocked; the insect prevention part is realized by matching with the motor driving mode, the motor is controlled to open the insect prevention part when the venturi tube is needed, and the motor is controlled to close the insect prevention part when the venturi tube is not used, so that the insect prevention purpose is realized, the insect prevention cost is high, and the insect prevention part is difficult to open and close to be synchronous with the operation of the fan or the wall-mounted furnace.

For example, the fan or the wall-mounted furnace is started, however, the insect prevention component is not synchronously started, the wind pressure detection is delayed, and the normal operation of the wind pressure detection is seriously influenced; or the wall hanging stove stops running, however, the insect prevention part is not synchronously closed, and the insect prevention part is closed later, so that insects such as mosquitoes, spiders and the like can climb into the venturi tube while the insects are on the machine, and the venturi tube is blocked; or the fan is not closed yet, the insect prevention part is closed in advance, wind pressure detection can not be normally performed, and wind pressure faults are reported.

Embodiments of the present utility model are described below with reference to fig. 1 to 8.

According to an embodiment of the present utility model, in one aspect, the present utility model provides a venturi assembly 12, the venturi assembly 12 being disposed at an exhaust outlet 110 of a blower 11, the venturi assembly 12 including a venturi 121 and an insect prevention member.

Specifically, an air duct communicated with the inner cavity of the fan 11 is arranged inside the venturi tube 121, and the air duct is provided with an air inlet and an air outlet; the venturi tube 121 is provided at an air inlet and/or an air outlet with an insect-proof member capable of closing the air duct in a natural state and opening the air duct under the wind force of the blower 11.

In the above embodiment, the opening and closing movement of the insect prevention member is controlled by the wind force of the fan 11 and the gravity and/or the elastic force of the insect prevention member, so as to achieve the purpose of preventing foreign objects from entering the venturi tube 121, and the insect prevention member not only can solve the problem that mosquitoes, spiders and the like are easy to climb into the venturi tube 121 to influence ventilation of the air duct and block the air duct, but also can realize that the opening and closing of the insect prevention member are synchronous with the operation of the fan 11, effectively avoid that the insect caused by delayed or advanced opening and closing of the insect prevention member climbs into the venturi tube 121 while the insect prevention member is in the machine, or wind pressure detection cannot be normally performed, and related potential safety hazards such as wind pressure faults are reported.

Compared with the existing insect prevention structure of the insect prevention net type, the insect prevention mode of the venturi tube assembly 12 provided by the embodiment is less prone to gathering impurities, even if impurity dust is gathered on the insect prevention piece, normal ventilation of the air duct during equipment starting cannot be affected, the anti-blocking air duct effect is better, and the venturi tube 121 is better protected.

Compared with the existing insect prevention structure with the insect prevention part driven by the motor to open and close, the insect prevention mode of the venturi tube assembly 12 provided by the embodiment realizes the opening and closing of the insect prevention part by the wind power of the fan 11, a driving mechanism is not required to be additionally arranged to drive the insect prevention part to open and close, the cost is lower, the insect prevention structure is easier to use and popularize, the synchronism and consistency of the opening and closing of the insect prevention part and the opening and closing of the fan 11 are better, and the problem of related potential safety hazards caused by the delay or the advance opening and closing of the insect prevention part by the motor to open and close in the related technology is effectively solved.

It should be noted that, in this embodiment, the natural state of the insect-preventing member means that the insect-preventing member is not acted by external driving force, the insect-preventing member can reset to close the air duct under the action of gravity and/or elastic force of the insect-preventing member in the natural state, and when the fan 11 is started, the wind force can overcome the gravity and/or elastic force of the insect-preventing member, so as to push the insect-preventing member open, and realize opening of the air duct in the venturi tube 121. In this embodiment, the fan 11 is preferably a centrifugal fan.

According to the embodiment, the air door structure is adopted, the self gravity and/or elasticity of the wind power of the fan 11 and the insect prevention piece are utilized to realize opening and closing movement, so that foreign objects are effectively prevented from entering the venturi tube 121, the venturi tube 121 of the fan 11 is effectively prevented from being blocked, normal use of a unit is ensured, after-sale maintenance is not needed, and cost is saved.

In some embodiments, the insect-repellent members include an inlet insect-repellent member 122 and an outlet insect-repellent member 123.

Specifically, the air inlet insect prevention member 122 is disposed at the air inlet of the venturi tube 121, and the air inlet insect prevention member 122 can close the air inlet in a natural state and can open the air inlet under the wind force of the fan 11; the air-out insect prevention member 123 is disposed at the air outlet of the venturi tube 121, and the air-out insect prevention member 123 can close the air outlet in a natural state and can open the air outlet under the wind force of the fan 11.

In the above embodiment, by arranging the air inlet and the air outlet with the air inlet insect prevention member 122 and the air outlet insect prevention member 123, the entry of foreign matters, insects, and the like into the venturi 121 from the air inlet or the air outlet of the venturi 121 can be effectively avoided, and the insect prevention effect is better.

In some embodiments, the insect-resistant member includes a mounting portion adapted to be removably secured to the venturi 121 and a blocking portion; the blocking part is movably connected with the mounting part, and when the fan 11 is started, the blocking part can open the air channel under the action of wind pressure; when the fan 11 is closed, the blocking part can be reset to the position for closing the air duct under the action of self gravity and/or elastic force.

In the above embodiment, the mounting portion is detachably mounted and fixed on the venturi tube 121, so that the mounting portion is convenient to disassemble, assemble and replace, and meanwhile, the inside of the venturi tube 121 is also convenient to overhaul and maintain. The plugging part is movably connected with the mounting part, so that the plugging part moves under the action of wind pressure, self gravity and elasticity more easily.

In some more specific embodiments, the intake air insect prevention member 122 includes a first mounting portion 1221 and a first blocking portion 1222, the first mounting portion 1221 being adapted to be removably secured at the air intake of the venturi 121; the first blocking part 1222 is movably connected with the first installation part 1221, and when the fan 11 is started, the first blocking part 1222 can open the air inlet under the action of wind pressure; when the fan 11 is turned off, the first blocking portion 1222 can be reset to a position of blocking the air inlet under the action of its own gravity and/or elastic force.

Further, the air-out insect prevention member 123 includes a second mounting portion 1231 and a second blocking portion 1232, the second mounting portion 1231 being adapted to be mounted and fixed at the air outlet of the venturi tube 121; the second blocking part 1232 is movably connected with the second mounting part 1231, and when the fan 11 is started, the second blocking part 1232 can open the air outlet under the action of wind pressure; when the fan 11 is turned off, the second blocking portion 1232 can be reset to the position for closing the air outlet under the action of its own gravity and/or elastic force.

In some embodiments, the mounting portion is adapted to be secured to an end of the venturi 121 with a ferrule, and the blocking portion is a blocking tab coupled to the mounting portion.

In the above embodiment, the installation portion is installed and fixed on the end portion of the venturi tube 121 by means of the clamping sleeve, the disassembly and assembly are quicker, and the plugging portion is in a structure of a plugging piece connected with the installation portion, so that the insect-proof piece is easier to open under the action of wind pressure, and the plugging piece can be automatically reset under the action of elastic force by means of elastic connection.

In some more specific embodiments, as shown in fig. 3, 4 and 7, the installation part comprises an annular installation main body, the annular installation main body comprises an annular clamping sleeve wall and an annular limiting wall arranged at one end of the clamping sleeve wall, an annular limiting step is formed between the annular clamping sleeve wall and the annular limiting wall, the inner diameter of the annular clamping sleeve wall is slightly smaller than the outer diameter of the pipe wall of the venturi 121, during assembly, the annular clamping sleeve wall is in interference fit with the periphery of the venturi 121, the annular limiting wall is in butt joint with the end wall of the venturi 121, and the annular limiting step is positioned and clamped on the end wall of the venturi 121.

In some embodiments, the first and second mounting portions 1221, 1231 are respectively secured over the air inlet and outlet ports of the venturi 121; the first blocking portion 1222 includes a first blocking piece connected to the first mounting portion 1221, and the second blocking portion 1232 includes a second blocking piece connected to the second mounting portion 1231.

In some embodiments, the first mounting portion 1221 and the second mounting portion 1231 are rubber members, and are respectively and directly sleeved on the peripheries of the nozzles at two ends of the venturi tube 121 in an interference manner, so that the air inlet insect prevention member 122, the air outlet insect prevention member 123 and the venturi tube 121 can be effectively fixed, and sealing can be realized.

In some embodiments, as shown in fig. 3 and 4, the cross-sectional shape and size of the blocking piece matches the cross-sectional shape and size of the air channel of the venturi 121, and one side of the blocking piece is elastically coupled to the mounting portion.

In the above embodiment, the inner circumferential section of the air duct is circular, and the blocking piece is set to be circular matching with the air duct, so that the blocking piece can close the air duct, and prevent foreign matters from entering the venturi tube 121.

In some more specific embodiments, the cross-sectional shape and size of the first blocking piece matches the cross-sectional shape and size of the air inlet, and one side of the first blocking piece is elastically connected to the inner peripheral side of the first mounting portion 1221; the second blocking piece has a cross-sectional shape and size matching those of the air outlet, and one side of the second blocking piece is elastically coupled to the outer circumferential side of the second mounting portion 1231.

In some embodiments, as shown in fig. 5, 7 and 8, the sealing piece at least comprises two flaps, the at least two flaps are respectively connected with the mounting part, and the at least two flaps are suitable for being matched with each other to open or close the air duct.

In the above embodiment, the multi-flap plugging piece can be mutually spliced to form a closed structure matched with the cross section of the air inlet or the air outlet of the air duct in size, and the plugging piece is designed into a multi-flap structure, so that compared with the integrated structure, when the insect prevention piece is opened, the air does not need to overcome the gravity and/or the elasticity of the whole plugging part, and the air can open the plugging part only by overcoming the original half or less than half of the gravity and/or the elasticity, so that the insect prevention piece is easier to open, the loss of wind energy can be effectively reduced, and the influence of the setting of the insect prevention piece on the wind speed and the wind flow can be reduced.

In some alternative embodiments, the closure flap may be provided as a split multi-flap structure, for example as a cross-shaped split, from which wind can blow in and open the flap. For example, a cross-shaped slit may be provided, and wind may be blown through the middle of the slit and open the closure flap.

In some alternative embodiments, the plugging piece can be provided with a half-door structure, the whole plugging piece is divided into two parts from the middle to form two flaps, the plugging part can be opened by wind only overcoming the original half gravity and/or elasticity, and the plugging part adopts the half-door structure to be compared with the integral structure, so that the influence of wind resistance can be effectively reduced.

In some more specific embodiments, the first sealing flap comprises a first flap sealing flap 12221 and a second flap sealing flap 12222, the first flap sealing flap 12221 and the second flap sealing flap 12222 being capable of cooperating with each other to seal the air intake; the second blocking piece comprises a third blocking piece 12321 and a fourth blocking piece 12322, and the third blocking piece 12321 and the fourth blocking piece 12322 can be matched with each other to jointly block the air outlet.

Further, as shown in fig. 5, 7 and 8, the first mounting portion 1221 includes a ring-shaped first mounting body and a first intermediate support portion 12211 connected in the middle of the ring-shaped first mounting body, the first and second flap plugging pieces 12221 and 12222 are respectively D-shaped and provided on both sides of the first intermediate support portion 12211, and the flat portions of the D-shaped first and second flap plugging pieces 12221 and 12222 are connected to the first intermediate support portion 12211. The second mounting part 1231 includes an annular second mounting body and a second middle supporting part 12311 connected in the middle of the annular second mounting body, the third and fourth flap blocking pieces 12321 and 12322 are respectively D-shaped and disposed at both sides of the second middle supporting part 12311, and the flat parts of the third and fourth flap blocking pieces 12321 and 12322 of the D-shaped are respectively connected with the second middle supporting part 12311.

Preferably, the first intermediate support 12211, the first flap seal 12221, the second flap seal 12222, and the first mounting body are integrally provided. The second intermediate support part 12311, the third flap blocking piece 12321, the fourth flap blocking piece 12322, and the second mounting body are integrally provided.

In some embodiments, the insect prevention member is an elastic member. The insect prevention piece is made of elastic materials, so that the blocking part can reset the air duct in the closed venturi 121 under the combined action of elasticity or elasticity and gravity, and the resetting is easier.

Optionally, the insect prevention member is made of a rubber material.

In this embodiment, the air inlet insect prevention member 122 and the air outlet insect prevention member 123 are elastic members made of rubber materials.

Because the fan 11 of the wall-hanging stove 20 is used in a high-temperature flue gas environment, the venturi tube 121 is generally made of a high-temperature resistant metal or plastic material, and the air inlet insect prevention member 122 and the air outlet insect prevention member 123 are generally made of a high-temperature resistant rubber material.

In some embodiments, as shown in fig. 3 to 6, the venturi 121 includes a venturi body 1211, and the venturi body 1211 includes an inlet section 12111, a reducing section 12112, a throat 12113, and an outlet section 12114, which are sequentially disposed in the direction of the air flow; the venturi 121 further comprises a positive pressure detection tube 1212 and a negative pressure detection tube 1213, wherein the positive pressure detection tube 1212 communicates with the inlet section 12111 and the negative pressure detection tube 1213 communicates with the throat 12113.

In the above embodiment, the positive pressure detecting tube 1212 and the negative pressure detecting tube 1213 are arranged in parallel, and the positive pressure detecting tube 1212 and the negative pressure detecting tube 1213 are arranged to facilitate connection with the wind pressure detecting switch 24, thereby realizing detection of wind pressure in the fan.

According to an embodiment of the present utility model, in another aspect, there is provided a fan assembly 10 comprising a fan 11 and a venturi assembly 12 of any of the embodiments described above.

Specifically, the blower 11 includes a blower housing provided with an air inlet and an air outlet 110, and the venturi assembly 12 is mounted to the blower housing near the air outlet 110.

The venturi assembly 12 is in this embodiment fastened to the fan 11 by screws.

Specifically, as shown in fig. 2 to 5, a position of the fan housing, which is close to the air outlet 110, is provided with a mounting structure suitable for mounting and fixing the venturi tube assembly 12, the venturi tube 121 is arranged in the fan housing, the mounting structure comprises an avoidance hole through which the positive pressure detection tube 1212 and the negative pressure detection tube 1213 can pass, and a screw hole for fixing the venturi tube 121, the venturi tube assembly 12 further comprises a connecting plate 1214 fixedly arranged on the positive pressure detection tube 1212 and the negative pressure detection tube 1213, screw columns are correspondingly arranged on the connecting plate 1214, the connecting plate 1214 is attached and fixed on the outer wall of the fan housing, and the venturi tube assembly 12 is fixed by sequentially passing through the screw columns and the screw holes through screws.

Further, the fan 11 further comprises an impeller arranged in the fan housing and a motor 13 for driving the impeller to rotate, and the motor 13 is fixedly arranged on the outer wall of the fan housing.

Alternatively, the fan 11 in the present embodiment is a centrifugal fan.

According to an embodiment of the present utility model, in another aspect, the present utility model further provides a wall-mounted boiler 20, including a casing 21, a combustion chamber 22 disposed in the casing 21, and the fan assembly 10 of any of the foregoing embodiments; wherein, the air inlet of the fan 11 is communicated with the smoke outlet of the combustion chamber 22, and the air outlet 110 of the fan 11 is communicated with the smoke discharging structure 23 on the casing 21.

Optionally, the smoke discharging structure 23 includes a smoke outlet formed on the casing 21 and a smoke pipe connector mounted and fixed on the smoke outlet, and the air outlet 110 of the fan 11 is connected with the smoke pipe connector. The air inlet of the fan 11 is assembled and connected with the combustion chamber 22, and the air outlet 110 is assembled and connected with the smoke pipe joint.

In some embodiments, a sealed chamber isolated from the environment space outside the casing 21 is formed in the casing 21, and the combustion chamber 22 and the fan assembly 10 are both disposed in the sealed chamber, and the combustion chamber 22 and the fan 11 are both communicated with the sealed chamber, so that continuous operation of the combustion chamber 22 is realized by continuously supplementing fresh air into the sealed chamber and extracting flue gas in the sealed chamber.

In some embodiments, the venturi 121 of the venturi assembly 12 is disposed vertically with the air inlet of the venturi 121 facing downward.

In the above embodiment, the venturi tube 121 is to be ensured to be vertical in the installation in the complete machine, and the air inlet is downward, so design ensures that the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 can be opened when the fan 11 is opened, and the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 can automatically fall down to be reset to the closed air inlet and air outlet under the action of gravity when the fan 11 is closed, so that the problem that the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 are difficult to reset due to insufficient elastic force is avoided.

In some embodiments, as shown in fig. 3, the intake air insect prevention piece 122 further includes a support limit 1223. The supporting and limiting part 1223 is arranged below the first blocking part 1222 of the air inlet insect prevention member 122 and is suitable for supporting and limiting the position of the air inlet insect prevention member 122, and the air inlet insect prevention member 122 can be kept at the position of the closed air inlet when not acted by external force through the arranged supporting and limiting part 1223, so that the insect prevention effect of the air inlet insect prevention member 122 is not influenced due to excessive downward reset.

Alternatively, the supporting and limiting portion 1223 is a boss or a bump integrally formed on the first mounting portion 1221.

In some embodiments, the wall-mounted boiler 20 further includes a wind pressure detection switch 24, the wind pressure detection switch 24 is disposed in the casing 21 and is used for detecting wind pressure of the fan 11, and the wind pressure detection switch 24 has a positive pressure detection port and a negative pressure detection port; wherein the positive pressure detection port is adapted to communicate with the positive pressure detection tube 1212 of the venturi 121 and the negative pressure detection port is adapted to communicate with the negative pressure detection tube 1213 of the venturi 121.

The venturi tube assembly 12 provided by the utility model consists of an air inlet insect prevention piece 122, a venturi tube 121 and an air outlet insect prevention piece 123; after the positive pressure detecting tube 1212 and the negative pressure detecting tube 1213 of the venturi tube 121 are connected with the wind pressure detecting switch 24, the wind pressure can be detected online in real time, so as to measure the unobstructed state of the smoke exhaust channel. When the detected wind pressure value is larger than a preset wind pressure opening value, the smoke exhaust is smooth and the ignition can be started, and when the detected wind pressure is smaller than a preset wind pressure closing value, the smoke exhaust is not smooth and the ignition cannot be started. The air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 are movable parts, and when the fan 11 is started, the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 are in an open state under the action of wind force; when the fan 11 is turned off, the air inlet insect prevention member 122 and the air outlet insect prevention member 123 are in a closed state under the action of self gravity and/or elasticity.

When the device works, firstly, the fan 11 is started, the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 are simultaneously blown open under the action of wind force, the wind pressure detected by the Venturi tube 121 and the wind pressure detection switch 24 is larger than a preset wind pressure starting value, and the device is ignited to run. When the equipment does not work, the fan 11 is firstly turned off and then turned off, after the fan 11 is stopped, the air inlet insect prevention piece 122 and the air outlet insect prevention piece 123 are reset to the closing state of the air inlet and the air outlet of the closed venturi tube 121 under the action of gravity and/or elasticity, so that the phenomenon that mosquitoes and spiders climb into the venturi tube 121 to cause blockage to influence the wind pressure detection value when the equipment does not work is avoided, the normal use of a unit is ensured, and the maintenance cost is reduced.

The venturi tube assembly 12 provided in this embodiment is provided with the air inlet insect prevention member 122 and the air outlet insect prevention member 123, which are similar to the air doors, the fan 11 blows air to overcome the resistance of the two air doors, the air speed can be reduced according to the formula of the calculated flow Q of the venturi tube, the flow is reduced, and the air pressure difference (P1-P2) is reduced. Therefore, in order to compensate for the influence of the air inlet insect prevention member 122 and the air outlet insect prevention member 123 on the air speed and the air flow, in the present embodiment, the wind pressure opening value and the wind pressure closing value of the wind pressure detection switch 24 can be reduced under the condition that the air volume is unchanged, and the wind pressure detection switch is matched for use through selection; in addition, the rotational speed of the blower 11 may be increased to increase the wind pressure.

The formula of the calculated flow Q of the venturi tube is specifically as follows:

S ₁ v ₁ ＝S ₂ v ₂ ＝Q

v ₁ average velocity at section 12111 of the inlet section

p ₁ Average pressure at section 12111 of the inlet section

S ₁ Cross-sectional area of the inlet section 12111

v ₂ Average velocity of cross section at throat 12113

p ₂ Average pressure across the throat 12113

S ₂ -throat 12113 cross-sectional area

ρ -fluid density

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (12)

1. A venturi assembly provided at an exhaust outlet (110) of a blower (11), the venturi assembly (12) comprising:

the venturi tube (121) is internally provided with an air duct communicated with the inner cavity of the fan (11), and the air duct is provided with an air inlet and an air outlet;

the insect prevention piece is arranged at the air inlet and/or the air outlet of the Venturi tube (121), can seal the air duct in a natural state, and can open the air duct under the action of wind power of the fan (11).

2. The venturi assembly of claim 1, wherein the insect prevention member comprises:

the air inlet insect prevention piece (122) is arranged at the air inlet of the venturi tube (121), and the air inlet insect prevention piece (122) can seal the air inlet in a natural state and can open the air inlet under the wind power action of the fan (11);

the air-out insect prevention piece (123) is arranged at the air outlet of the Venturi tube (121), and the air-out insect prevention piece (123) can seal the air outlet in a natural state and can open the air outlet under the action of wind power of the fan (11).

3. The venturi assembly of claim 1, wherein the insect prevention member comprises:

a mounting portion adapted to be detachably mounted and fixed to the venturi tube (121);

the blocking part is movably connected with the mounting part, and can open the air duct under the action of wind pressure when the fan (11) is started; when the fan (11) is closed, the blocking part can be reset to a position for closing the air duct under the action of self gravity and/or elastic force.

4. A venturi assembly according to claim 3, wherein the mounting portion is adapted to be secured to an end of the venturi (121) by a bayonet fitting, the plug being a plug tab connected to the mounting portion.

5. The venturi assembly according to claim 4, wherein the blocking piece has a cross-sectional shape and size matching a cross-sectional shape and size of the air duct, and one side of the blocking piece is elastically coupled to the mounting portion.

6. The venturi assembly according to claim 4, wherein the blocking piece comprises at least two flaps, the at least two flaps are respectively connected with the mounting portion, and the at least two flaps are adapted to cooperate with each other to open or close the air duct.

7. The venturi assembly of any one of claims 1-6, wherein the insect prevention member is an elastic member.

8. The venturi assembly according to any one of claims 1 to 6, wherein the venturi (121) comprises:

a venturi body (1211), the venturi body (1211) comprising an air inlet section (12111), a reduced diameter section (12112), a throat (12113), and an air outlet section (12114) arranged in sequence along the direction of air flow;

a positive pressure detection tube (1212) and a negative pressure detection tube (1213), wherein the positive pressure detection tube (1212) is in communication with the air inlet section (12111), and the negative pressure detection tube (1213) is in communication with the throat (12113).

9. A fan assembly characterized by comprising a fan (11) and a venturi assembly (12) according to any of the preceding claims 1 to 8;

the fan (11) comprises a fan shell, an air inlet and an air outlet (110) are formed in the fan shell, and the venturi tube assembly (12) is installed at the position, close to the air outlet (110), of the fan shell.

10. A wall-mounted boiler characterized by comprising a casing (21), a combustion chamber (22) arranged in the casing (21) and the fan assembly (10) of the above claim 9;

the air inlet of the fan (11) is communicated with the smoke outlet of the combustion chamber (22), and the air outlet (110) of the fan (11) is communicated with the smoke discharging structure (23) on the shell (21).

11. The wall-mounted boiler according to claim 10, wherein the venturi (121) of the venturi assembly (12) is arranged vertically, and the air inlet of the venturi (121) is directed downwards.

12. The wall-hanging stove according to claim 10, characterized in that the wall-hanging stove (20) further comprises:

the wind pressure detection switch (24) is arranged in the shell (21) and is used for detecting the wind pressure of the fan (11), and the wind pressure detection switch (24) is provided with a positive pressure detection port and a negative pressure detection port;

wherein the positive pressure detection port is adapted to communicate with a positive pressure detection tube (1212) of the venturi tube (121), and the negative pressure detection port is adapted to communicate with a negative pressure detection tube (1213) of the venturi tube (121).