CN217873440U - Fan and gas heater - Google Patents

Abstract

The utility model provides a fan and gas heater relates to gas heater's field. The fan comprises a fan body, the fan body is provided with an air inlet for air flow to flow in, the fan further comprises a fan baffle and a negative pressure adjusting mechanism for driving the fan baffle to move, the negative pressure adjusting mechanism is set to reduce the shielding degree of the fan baffle on the air inlet when the flow rate of the air flow in the fan body is increased, and to increase the shielding degree of the fan baffle on the air inlet when the flow rate of the air flow in the fan body is reduced; the gas water heater comprises the fan. The utility model has the advantages of the fan is small in noise and stable in adjustment during operation.

Description

Fan and gas heater

Technical Field

The utility model relates to a gas heater's field especially relates to a fan and gas heater.

Background

The fan can realize stepless speed regulation between the highest wind speed and the lowest wind speed during working. Usually, the maximum wind speed of the fan is set lower in order to reduce the operating noise.

In order to ensure that the maximum air quantity of the fan reaches the standard when the noise of the fan is reduced and the maximum rotating speed of the fan is reduced, the air inlet area needs to be increased. Due to the technical development of the motor, when the rotating speed of the motor is lower than 2000n/min, the rotating speed control is unstable, so that the minimum rotating speed of the fan cannot be too low. Therefore, after the air inlet area is increased, the air volume of the fan is easy to be overlarge when the fan rotates at the minimum speed. When the fan is used for a gas water heater, the excessive air volume easily causes flame to leave flame and to extinguish.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that the too big defect of amount of wind when the big or minimum rotational speed function of noise provides a fan and gas heater when overcoming among the prior art fan maximum rotational speed function.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

in a first aspect, the utility model provides a fan, including the fan body, the fan body has the air intake that is used for supplying the air current to flow in, the fan still includes the fan baffle and is used for driving negative pressure adjustment mechanism that the fan baffle removed, negative pressure adjustment mechanism sets up to reduce during the velocity of flow increase of this internal air current of fan the fan baffle is right the degree of sheltering from of air intake, and increase when the velocity of flow of this internal air current of fan reduces the fan baffle is right the degree of sheltering from of air intake.

In this scheme, the fan baffle sets up in the air intake department of fan body, when the fan body is in high gear, when the rotational speed of fan body is higher, the gas flow velocity in the fan is great, negative pressure adjustment mechanism drive fan baffle removal this moment reduces the degree of sheltering from of fan baffle to the air intake, the intake has been increaseed, make the fan body reduce for reaching required maximum wind speed when same maximum amount of wind, thereby can reduce the required maximum rotational speed of fan body, reduce the noise of fan body. When the fan body is in low gear, the rotational speed of the fan body is lower, the gas flow speed in the fan body is reduced at the moment, the negative pressure adjusting mechanism drives the fan baffle to move so as to increase the shielding degree of the fan baffle to the air inlet, the air inlet area is reduced, the minimum required air speed is increased when the fan body reaches the required air quantity of low gear, the rotational speed of the fan body is not too small, and the rotational speed of the motor is favorably and stably controlled.

Preferably, the negative pressure adjusting mechanism comprises a venturi tube, a variable volume receptor and a driving member, the venturi tube is arranged in the fan body along the outflow direction of the air flow, the variable volume receptor is communicated with the throat part of the venturi tube and can change the volume of the venturi tube along with the change of the internal pressure, and the driving member is connected between the variable volume receptor and the fan baffle and can drive the fan baffle to move along with the change of the volume of the variable volume receptor.

In the scheme, a structure of the negative pressure adjusting mechanism is disclosed; the venturi tube is arranged in the fan body along the airflow flowing direction, namely, the airflow blown out by the fan can pass through the venturi tube and then is discharged out of the fan; the throat part of the Venturi tube can generate negative pressure; when the wind speed of fan body was the biggest, the negative pressure of venturi's throat was the biggest, and the varactor acceptor with venturi intercommunication this moment is in the minimum state of volume because the negative pressure to drive the drive member and remove and make the fan baffle of connecting on the drive member remove and open the air intake to the at utmost. When the wind speed of fan body reduces, the negative pressure of venturi's throat reduces, the volume crescent with the varactor acceptor of venturi intercommunication this moment to make driving member remove and drive the fan baffle and remove in order to shelter from the air intake, thereby reduce the intake.

Preferably, the varactor receptor comprises a rigid box body with an opening on one side and a flexible membrane hermetically covering the opening of the rigid box body, the rigid box body is communicated with the throat part of the Venturi tube, and the driving member is connected with the flexible membrane.

In the scheme, the varactor receptor comprises a rigid box body and a flexible membrane, the flexible membrane is covered at the opening of the rigid box body in a sealing manner, and the air pressure in the rigid box body is the same as that of the throat part of the Venturi tube; when the fan starts, be the negative pressure state in the rigid box, the flexible membrane squints to rigid box under the effect of the pressure differential of its both sides in to drive the drive member who connects on the flexible membrane and remove in order to change the degree of sheltering from of fan baffle to the air intake.

Preferably, one end of the fan baffle is rotatably connected to the fan body, and the other end of the fan baffle is rotatably connected to one end of the driving member, which is far away from the flexible film.

In this scheme, the one end and the fan body of fan baffle rotate to be connected, and the other end rotates with drive component to drive component can stimulate the fan baffle and rotate the degree of sheltering from in order to change fan baffle to the air intake.

Preferably, a movable groove is formed in the fan baffle, and one end, far away from the variable-volume receptor, of the driving member is inserted into the movable groove and is adapted to slide and rotate relative to the movable groove.

In this scheme, seted up the activity groove on the fan baffle, the one end of drive member is inserted in the activity groove and can take place to slide and rotate relative to the activity groove, and the drive member is difficult for the fan baffle to take place to interfere when driving the fan baffle rotation from this for the fan baffle rotates more smoothly.

Preferably, the drive member slides along a straight line.

In the scheme, the driving member slides linearly, so that the driving member can slide more stably, and the rotation of the fan baffle is more stable; meanwhile, the two ends of the movable groove limit the driving component, so that the driving component slides in a certain range, and the fan baffle rotates in a certain angle, and the maximum opening degree and the minimum opening degree of the air inlet can be controlled conveniently.

Preferably, the two fan baffles are symmetrically arranged along the driving member, the movable grooves of the two fan baffles are overlapped with each other, and the driving member is inserted into the two movable grooves towards one end far away from the varactor receptor.

In this scheme, fan baffle is provided with two along the drive component symmetry, and the drive component is inserted simultaneously in the activity groove of two fan baffles to can stimulate two fan baffles to rotate the degree of opening in order to change the air intake in step when the drive component rotates.

Preferably, the inlet of the venturi tube is opposite to the air outlet of the blower body.

In this scheme, venturi's import is relative with the air outlet, and the relative air outlet that indicates the fan body of here aligns with venturi's import, makes the fan combustion air flow can pass through venturi comparatively smoothly from this, reduces venturi's installation to the influence of fan.

Preferably, the varactor receptor and the venturi are in communication via a hose.

In this scheme, through the hose connection between varactor acceptor and the venturi to the varactor acceptor can be installed in each position with each angle, has made things convenient for the installation of varactor acceptor, has increased negative pressure adjustment mechanism's suitability.

In a second aspect, the present invention provides a gas water heater, including the blower as described above.

In this scheme, through adopting above-mentioned fan in gas heater to make the noise of gas heater load biggest (being fan wind speed the biggest) time fan less, the difficult circumstances such as flame, flame-out that appear leaving of gas heater because of the amount of wind is too big when gas heater load is less (being the wind speed of fan less) simultaneously (being the fan).

The utility model discloses an actively advance the effect and lie in:

the utility model discloses a set up the fan baffle outside the air intake of fan body to this internal negative pressure adjustment mechanism that sets up of fan, negative pressure adjustment mechanism drives the fan baffle according to fan body exhaust gas's velocity of flow in real time and removes with the degree that shelters from of adaptability adjustment fan baffle to the air intake, thereby the air intake of adjustment fan body, the amount of wind demand when adapting to this body high wind speed of fan or low wind speed.

Drawings

Fig. 1 is a schematic structural view of a gas water heater according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a fan according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a negative pressure adjusting mechanism according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a fan according to embodiment 2 of the present invention.

Fig. 5 is a schematic structural view of the fan according to embodiment 3 of the present invention at a low rotation speed.

Fig. 6 is a schematic structural view of the fan according to embodiment 3 of the present invention at a high rotation speed.

Fig. 7 is a schematic structural view of a fan according to embodiment 4 of the present invention.

Fig. 8 is a schematic structural view of a fan according to embodiment 5 of the present invention.

Description of the reference numerals:

outer casing 100

Burner 200

Heat exchanger 300

Fan 400

Blower body 410

Case 411

The intake port 412

Air outlet 413

Guide block 414

Guide chute 415

Fan guard 420

Movable groove 421

Negative pressure regulating mechanism 430

Venturi 431

Contraction section 4311

Throat 4312

Diffuser section 4313

Varactor receptor 432

Rigid box 4321

Flexible membrane 4322

Negative pressure connection joint 4323

Hose 4324

Sliding cover 4325

Drive member 433

Detailed Description

The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.

Example 1

The present embodiment discloses a gas water heater, and referring to fig. 1, the gas water heater includes a housing 100, a burner 200, a heat exchanger 300, and a blower fan 400. The housing 100, the burner 200, and the heat exchanger 300 are the same as or similar to those of the prior art, and will not be described herein again. A blower 400 is provided in the housing 100 for supplying combustion air to the burner 200 and discharging flue gas generated by the combustion.

Referring to fig. 2, the blower 400 includes a blower body 410 for supplying wind to the gas water heater, a blower flap 420 for adjusting an air intake area of the blower body 410, and a negative pressure adjusting mechanism 430 for adjusting a position of the blower flap 420 with respect to the blower body 410 according to a wind speed generated by the blower body 410.

In this embodiment, the blower body 410 has a high gear and a low gear. When the fan body 410 is in a high gear, the wind speed of the fan 400 is maximum; when the fan body 410 is in a low gear, the wind speed of the fan 400 is minimum. Therefore, the air volume requirements of the gas water heater under different loads are met. In other embodiments, the blower body 410 may have different gears as required.

The blower body 410 includes a housing 411 and an impeller assembly disposed within the housing 411. The housing 411 is provided with an air inlet 412 and an air outlet 413, and external air flows into the housing 411 through the air inlet 412, is accelerated by the impeller assembly, and then is discharged out of the housing 411 through the air outlet 413.

The shape of the air inlet 412 can be designed according to the requirement, and in this embodiment, the air inlet 412 is designed as a circular opening, so that the air can flow more uniformly and smoothly.

The blower baffle 420 is disposed at a side of the housing 411 where the air inlet 412 is opened and covers the air inlet 412. One end of the fan guard 420 is rotatably disposed on the housing 411 through a rotating shaft, so that the fan guard 420 can rotate around the rotating shaft to change the shielding degree of the fan guard 420 for the air inlet 412.

In this embodiment, the fan baffle 420 is a crescent-shaped plate, and in other embodiments, the fan baffle 420 may have other suitable shapes.

Referring to fig. 2 and 3, the negative pressure adjusting mechanism 430 includes a venturi 431, a volume changing body 432, and a driving member 433. The venturi tube 431 is fixedly provided in the housing 411 of the blower body 410 in the direction in which the air current flows. The arrangement in the air flow direction here means that the length direction of the venturi 431 coincides with the flow direction of the air blown from the blower body, and the air blown from the blower body 410 can flow through the venturi 431. A varactor 432 is in communication with the venturi 431. One end of the driving member 433 is connected to the varactor 432, and the other end is connected to the blower shield 420.

The venturi 431 includes a contraction section 4311, a throat 4312, and a diffusion section 4313 connected in sequence. The end of the contracting section 4311 away from the throat 4312 has an inlet for the airflow generated by the blower body 410 to flow in, and the inlet is opposite to the air outlet 413 of the blower body 410, i.e. the inlet is aligned with the air outlet 413 of the blower body 410, so that a part of the airflow originally discharged from the air outlet 413 of the blower 400 can smoothly flow into the venturi 431 from the inlet and flow out of the diffusing section 4313 and then be discharged through the air outlet 413.

The varactor 432 includes a rigid case 4321 and a flexible membrane 4322. One side of the rigid housing 4321 is open, the flexible membrane 4322 is sealingly covered at the opening, and the side of the flexible membrane 4322 remote from the rigid housing 4321 is connected to the driving member 433. The rigid housing 4321 is in communication with the throat 4312 of the venturi 431 such that the air pressure inside the rigid housing 4321 is the same as the air pressure of the throat 4312 of the venturi 431. When the airflow passes through the venturi 431, the throat 4312 of the venturi 431 generates a negative pressure, so that the negative pressure is formed inside the rigid box 4321, and the flexible membrane 4322 moves towards the inside of the rigid box 4321 under the action of the pressure difference between the two sides, so as to drive the driving member 433 to move, so as to drive the fan baffle 420 to rotate.

Wherein, a negative pressure connecting joint 4323 is arranged on the rigid box 4321, and a hose 4324 is arranged between the negative pressure connecting joint 4323 and the throat 4312 of the venturi tube 431, thereby realizing the communication between the volume-variable receptor 432 and the venturi tube 431.

Referring to fig. 2 and 3, an end of the driving member 433 away from the flexible membrane 4322 is provided with a rotating shaft which is inserted into the blower guard 420 and can rotate relative to the blower guard 420, so that the driving member 433 is rotatably connected to the blower guard 420. Therefore, when the air pressure in the varactor 432 changes, the flexible film 4322 drives the driving member 433 to move, so as to drive the fan baffle 420 to rotate to change the shielding degree of the fan baffle 420 to the air inlet 412.

In this embodiment, the driving member 433 is elongated, and in other embodiments, the driving member 433 may have other suitable shapes.

The working principle of the gas water heater of the embodiment is as follows:

when the gas water heater is in a high-load state, the fan 400 is in a high gear, the wind speed and the rotating speed of the fan body 410 are both large, and the negative pressure of the throat 4312 of the venturi tube 431 is large, so that the negative pressure in the rigid box 4321 is large, the offset of the flexible membrane 4322 to the rigid box 4321 is large, the driving member 433 drives the fan baffle 420 to rotate for a large offset distance, the exposed area of the air inlet 412 is large, and the air inlet area is large. Therefore, the maximum wind speed required by the fan body 410 to meet the supplied wind quantity is reduced, and the noise of the fan body 410 is reduced.

When the gas water heater is in a low-load state, the fan 400 is in a low gear, at this time, the wind speed and the rotation speed of the fan body 410 are both relatively small, the negative pressure at the throat 4312 of the venturi tube 431 is relatively small, so that the negative pressure in the rigid box 4321 is relatively small, the offset of the flexible membrane 4322 towards the rigid box 4321 is relatively small, the distance for the driving member 433 to drive the fan baffle 420 to rotate and offset is relatively small, the shielding degree of the fan baffle 420 on the air inlet 412 is relatively large, the exposed area of the air inlet 412 is relatively small, the air inlet area is relatively small, so that the air volume of the fan body 410 is reduced to a required working condition under the condition that the rotation speed is not too low, the gas water heater is not prone to generate flame separation, flameout and the like due to too large air volume, and is beneficial to stably controlling the rotation speed of the motor of the fan body 410.

Example 2

The present embodiment is substantially the same as the gas water heater of embodiment 1, and the differences are as follows:

referring to fig. 4, in this embodiment, the fan baffle 420 has a fan shape, and a portion thereof near the center of the fan baffle is rotatably connected to the housing 411 through a rotating shaft. In addition, in other embodiments, the blower baffle 420 may have other suitable shapes. The blower baffle 420 is provided with a movable groove 421, and one end of the driving member 433, which is far away from the flexible film 4322, is provided with a rotating shaft, which is inserted into the movable groove 421 and can rotate and/or slide relative to the movable groove 421.

In this embodiment, the movable groove 421 is a waist-shaped groove. In addition, in other embodiments, the movable slot 421 can have other suitable shapes.

The driving member 433 is capable of linear movement by the varactor 432. Specifically, the housing 411 is provided with two opposite guide blocks 414, and a guide sliding slot 415 is formed between the two guide blocks 414 at an interval. Drive member 433 passes through guide runner 415 and slides along the length of guide runner 415 under the limit of guide runner 415. Therefore, the driving member 433 is not easy to shake relative to the flexible membrane 4322, and the sliding of the driving member 433 is more stable; when the driving member 433 slides, the rotating shaft on the driving member 433 slides and rotates relative to the movable slot 421 to prevent the driving member 433 from being pressed against the inner wall of the movable slot 421; meanwhile, due to the blocking of the end of the movable groove 421, the driving member 433 can only drive the fan baffle 420 to rotate within a limited range, that is, when the rotating shaft on the driving member 433 slides to the end of the movable groove 421, the driving member 433 cannot continue to drive the fan baffle 420 to rotate, so that the movement angle of the fan baffle 420 is limited, the opening degree of the air inlet 412 is not too large or too small, and the normal requirement of the air volume can be met.

Example 3

This embodiment is substantially the same as embodiment 2, except that:

referring to fig. 5 and 6, in the present embodiment, the number of the fan baffles 420 is two. The two fan baffles 420 are symmetrically disposed on the housing 411 along the driving member 433 and the two fan baffles 420 partially overlap. The movable grooves 421 penetrate both side surfaces of the corresponding blower baffles 420, and the movable grooves 421 of the two blower baffles 420 are overlapped with each other. The rotating shaft of the driving member 433 is simultaneously inserted into the two movable slots 421. When the driving member 433 slides linearly under the driving of the variable volume receptor 432, the two fan baffles 420 rotate relative to the housing 411, so that the area of the air inlet 412 blocked by the two fan baffles 420 changes, thereby adjusting the air inlet area of the fan body 410.

Referring to fig. 5, when the fan body 410 is in the low gear, the wind speed of the fan body 410 is the lowest. At this time, the rotating shaft on the driving mechanism is pressed against the inner walls of the ends of the two movable slots 421 close to the circle centers of the corresponding fan baffles 420. At this time, the air inlet area of the air inlet 412 is the smallest, so that the fan body 410 does not need to reduce the rotation speed of the motor too much, and the air volume is not easy to be too large to affect the operation of the gas water heater under low load.

Referring to fig. 6, when the fan body 410 is in a high gear, the wind speed of the fan body 410 is maximum. At this time, the rotating shaft of the driving mechanism is pressed against the inner walls of the two movable slots 421 away from the center of the fan baffle 420. At this time, the air inlet area of the air inlet 412 is the largest, so that the air speed of the fan body 410 does not need to be too high, and the air volume requirement of the gas water heater under high load can be met, and the noise of the fan 400 is reduced.

Example 4

This embodiment is substantially the same as embodiment 2, except that:

referring to fig. 7, in the present embodiment, the blower guard 420 is not connected to the housing 411. The blower baffle 420 is attached to the surface of the housing 411 and covers the air inlet 412. One end of the driving member 433 away from the flexible membrane 4322 is fixedly connected with the blower guard 420. When the driving member 433 slides, the blower shield 420 slides along the housing 411 to change the shielding degree of the air inlet 412.

Example 5

This embodiment is substantially the same as embodiment 2 except that the varactor acceptor 432 in this embodiment is different from the varactor acceptor 432 in embodiment 2.

Referring to fig. 8, in the present embodiment, the varactor receptor 432 includes a rigid case 4321 and a sliding cover 4325 slidably sealed at an opening of the rigid case 4321. The sliding cover 4325 is made of a rigid material and can reciprocate linearly with respect to the rigid case 4321. The driving member 433 is fixed to a side of the sliding cover away from the rigid case 4321.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (10)

1. The utility model provides a fan, includes the fan body, the fan body has the air intake that is used for the air current to flow in, a serial communication port, the fan still includes the fan baffle and is used for driving the negative pressure adjustment mechanism that the fan baffle removed, negative pressure adjustment mechanism sets up to reduce when the velocity of flow of this internal air current of fan increases the fan baffle is right the degree of sheltering from of air intake, and increase when the velocity of flow of this internal air current of fan reduces the fan baffle is right the degree of sheltering from of air intake.

2. The blower of claim 1, wherein the negative pressure adjustment mechanism includes a venturi tube disposed in the blower body in an outflow direction of the air flow, a volume-changing receptor communicating with a throat portion of the venturi tube and capable of changing a volume thereof in response to a change in internal pressure, and a driving member connected between the volume-changing receptor and the blower flap and capable of driving the blower flap to move in response to a change in the volume of the volume-changing receptor.

3. The blower of claim 2, wherein the positive-displacement receiver includes a rigid housing open on one side and a flexible diaphragm sealingly covering the opening of the rigid housing, the rigid housing communicating with the throat of the venturi, the drive member being coupled to the flexible diaphragm.

4. The fan as claimed in claim 3, wherein one end of the fan guard is rotatably coupled to the fan body, and the other end of the fan guard is rotatably coupled to an end of the driving member remote from the flexible membrane.

5. The blower according to claim 2, wherein the blower baffle has a movable slot formed therein, and an end of the driving member, which is away from the varactor body, is inserted into the movable slot and adapted to slide and rotate relative to the movable slot.

6. The fan of claim 5 wherein the drive member slides in a straight line.

7. The blower according to claim 6, wherein the blower baffles are symmetrically arranged in two along the driving member, the movable grooves of the two blower baffles overlap each other, and the driving member is inserted into both of the movable grooves toward an end away from the varactor.

8. The fan of claim 2, wherein the inlet of the venturi is opposite the outlet of the fan body.

9. The fan of claim 2, wherein the positive-displacement receptor and the venturi are in communication via a hose.

10. A gas water heater comprising a blower as claimed in any one of claims 1 to 9.

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