JPH11141861A - Dust trap device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the pressure loss in the air flow, and to surely trap and remove the dust contained in the air flow. SOLUTION: An inlet 36 of the air flow is provided on one end side of a case 38, and an outlet 37 is provided on the other end side. An obstruction member 40 is arranged in the case 38. A first trap wall 42 is projectingly formed on an air flow collision surface 41 of the obstruction member 40. A second trap wall 44 projected in an air passage 43 side from the case 38 is provided on a flow part where the air collided with the air flow collision surface 41 flows downward. The air flow entering from the inlet 36 is collided with the air flow collision surface 41 to trap the dust in the air flow by the first trap wall 42. The dust composition contained in the downward air flow after the air flow is collided with the air flow collision surface 41 by deviating the dust contained in the air flow from the route of the air flow making use of its inertia force, and collided with the second trap wall 44 to be trapped and removed, and the clean air free from any dust is sent out from the outlet 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention captures and removes dust (dust) in the air which is provided to a combustion device such as a water heater or a bath kettle and is guided to a flow rate detection sensor for detecting a flow rate of combustion air. The present invention relates to a dust trap device.

[0002]

2. Description of the Related Art FIG. 6 shows a system configuration of a water heater under development by the applicant. In FIG.
The apparatus main body 2 is accommodated therein, and a combustion chamber 3 is provided inside the apparatus main body 2, and a burner 4 is installed below the combustion chamber 3. A gas nozzle 7 attached to a nozzle header 6 is opposed to the gas introduction section 5 of the burner 4, and a gas supply passage 8 is connected to the nozzle header 6. The gas supply passage 8 has a nozzle header 6
Valve 10 for supplying and shutting off gas to the burner 4 and proportional valve 11 for controlling the supply amount of gas to the burner 4 by the opening amount
And an original solenoid valve 12 for opening and closing the gas supply passage 8. A combustion fan 13 for supplying and discharging burner combustion is provided below the burner 4, and an air chamber 14 is formed between the combustion fan 13 and the burner 4.

[0003] Between the air chamber 14 and the combustion chamber 3, there is provided an air distribution passage 15 for taking in and flowing a part of the combustion air supplied from the combustion fan 13 to the burner 4. An airflow detection sensor 16 that detects the airflow of the combustion air supplied from the combustion fan 13 to the burner 4 is provided in the branch passage 15. The air volume detection sensor 16 is constituted by an appropriate sensor having a function of directly or indirectly detecting the air volume, such as a hot-wire heater type wind speed sensor or a differential pressure sensor.

[0004] Above the combustion chamber 3 is a hot water supply heat exchanger 1
A water supply passage 18 is connected to the inlet side of the hot water supply heat exchanger 17. The water supply passage 18 has a water amount sensor 20 for detecting a water supply flow rate and a water supply temperature sensor 21 for detecting a water supply temperature. Is provided. A hot water supply passage 22 is connected to the outlet side of the hot water supply heat exchanger 17, and the hot water supply passage 22 is provided with a hot water supply temperature sensor 23 for detecting a hot water supply temperature and a water amount control valve 24 for controlling a hot water supply flow rate.

The operation of the water heater is controlled by a controller 25, to which a remote controller 26 for setting operating conditions such as hot water temperature is connected by signal.

[0006] The control device 25 controls the gas supply amount by the opening amount of the proportional valve 11 so that the hot water supply temperature becomes the hot water supply set temperature set by the remote controller 26, and also controls a predetermined appropriate air-fuel ratio. The rotation of the combustion fan 13 is controlled so as to be as follows. The control of the air volume of the combustion air will be described in more detail. The control device 25 is provided with data on the relationship between the amount of combustion heat and the amount of air supplied (air volume), and the target air volume corresponding to the required combustion heat amount obtained by calculation. And controls the rotation of the combustion fan 13 so that the air volume detected by the air volume detection sensor 16 becomes the target air volume. In FIG. 6, reference numeral 27 denotes a fan rotation detection sensor that detects the rotation of the combustion fan 13 per unit time.

[0007]

As described above, a part of the combustion air supplied from the combustion fan 13 to the burner 4 is diverted through the air distribution passage 15 to detect the fan airflow.
By performing the rotation control of the combustion fan 13 based on the air volume detection information, a suitable air-fuel ratio control in which the amount of combustion heat and the air volume match can be performed. However, combustion fan 1
The air taken in from the outside by 3 contains dust such as dust and trash, and the air volume detection sensor 16 directly contacts the air passing through the air branch passage 15 to detect the air volume. Adheres to the air volume detection section, and as the amount of dust attached increases, the air volume detection performance of the air volume detection sensor 16 deteriorates, and the reliability of long-term air volume detection is impaired. There is a problem that the accuracy of the fuel ratio control is also reduced.

In order to solve such a problem, the applicant has been studying a dust trap device incorporating an air volume detection sensor 16 as shown in FIG.

In the dust trap device of this study, a trap passage 31 is formed on the front side of the body main body 28 with a partition wall 30 interposed therebetween, and a sensor installation space 32 is formed on the back side as shown in FIG. . In the trap passage 31, trap walls 33 are formed so as to alternately overlap and protrude from both side walls of the passage at right angles. A partition wall 34 for partitioning the left and right trap passages 31 is provided at the center, and the left and right trap passages 31 communicate with each other via the sensor installation space 32.

That is, a communication hole 35a communicating with one end of the sensor installation space 32 is formed in the left trap passage connected to the partition wall 34, and a communication hole 35a is formed in the right trap passage 31 at the other end of the sensor installation space 32. A communication hole 35b for communication is provided, and the flow of the wind introduced from the inlet 36 of the trap passage 31 on the left side is guided to the sensor installation space 32 on the back side through the communication hole 35a through the trap passage 31 on the left side. The wind passing through the space 32 is guided from the communication hole 35b to the right trap passage 31 formed on the surface side, and is sent out from the outlet 37 of the trap passage 31 through the right trap passage 31. I have.

The sensor installation space 32 is a space of a straight path connecting the communication holes 35a, 35b arranged side by side via the partition wall 34 at the shortest distance. A detection sensor 16 is provided. In this dust trap device, the inlet side 36 is set to the air chamber 14 side, and the outlet side 37 is set to the combustion chamber 3 side, and is provided in the air distribution passage 15.

In this dust trap device, a plurality of trap walls 33 are formed alternately in the trap passage 31 so as to protrude with their leading ends overlapping, so that the flow of combustion air flowing therethrough is indicated by arrows in FIG. As described above, the trap wall 33 bends in a zigzag direction in a substantially 90 ° direction and meanders, and when the wind is bent by the trap wall 33, the dust contained in the air reduces the inertia force in the straight traveling direction. In order to receive the air flow, the air flow detection sensor 1 cannot be turned sharply, but hits the trap wall 33 and is prevented from advancing. The dust is captured and removed, and the wind from which the dust is removed enters the sensor installation space 32.
6 prevents dust from adhering to the air volume detection unit, guarantees the air volume detection accuracy of the air volume detection sensor 16 for a long time,
The purpose is to improve the accuracy and reliability of air volume detection.

However, the dust trap device of the study shown in FIG. 7 has a configuration in which the tip side of the trap wall 33 is overlapped from the trap passage 31 and the trap wall 33 projects in a substantially perpendicular direction in a zigzag manner. Since the flow of the wind passing through the passage 31 alternately changes the direction of the flow by approximately 90 ° and progresses in a zigzag manner, there is a problem that the pressure loss becomes extremely large.

The apparatus shown in FIG.
Since the communication holes 35a and 35b are arranged adjacent to each other through the through hole, and the sensor installation space 32 is provided in a form in which the communication holes 35a and 35b are connected at the shortest distance in a straight line,
The wind that enters the sensor installation space 32 from the communication hole 35a side is bent at a right angle, the flow path fluctuates due to the course of the path, and the straight path of the sensor installation space 32 is short, so that the wind is bent at a right angle from the communication hole 35a. Since the entered wind contacts the air flow detection sensor 16 in a state where the flow velocity fluctuation is not eliminated and the air flow is detected, the detected value of the air flow fluctuates due to the flow velocity fluctuation, and there is a problem that an accurate air flow cannot be accurately detected. Occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first object of the present invention is to minimize the pressure loss of the air flow so as to reliably capture and remove dust in the air, thereby improving the cleanliness. Another object of the present invention is to provide a dust trap device capable of sending clean air. In addition to the function of trapping and removing dust, the dust trap device further removes dust and removes clean air without fluctuation in flow velocity. An object of the present invention is to provide a dust trap device that can be brought into a rectified state and guided to an airflow detection sensor.

[0016]

The present invention employs the following means to achieve the above object. That is, in the first invention, in a case provided with an inlet and an outlet for an air flow at different positions, an obstruction member against which the air flow entering the case from the inlet abuts against the inlet of the air flow is arranged. The space between the obstacle member and the case wall forms an air passage for guiding the airflow to the outlet, and the airflow collision surface of the obstacle member against which the airflow strikes captures dust in the airflow.
A configuration in which the trap wall is formed so as to protrude is a means for solving the problem.

According to a second aspect of the present invention, in a case provided with an inlet and an outlet for the air flow at different positions, an obstacle member against which the air flowing into the case from the inlet abuts is disposed opposite to the air flow inlet. The space between the obstacle member and the case wall forms an air passage for guiding the air flow to the outlet, and the first trap wall for capturing dust in the air flow is provided on the air flow collision surface of the obstacle member against which the air flow abuts. Are formed, and
A means for solving the problem has a configuration in which a second trap wall protruding from the case wall surface into the air passage is provided at a flow portion where the air flow hits the obstacle member and goes downward.

In a third aspect of the present invention, in the apparatus having the configuration of the second aspect, the air between the obstacle and the upper inner wall surface of the case is closed to impinge on the air flow collision surface of the obstacle. This is a means to solve the problem by forcibly guiding the flow to the downward flow.

Further, in the fourth invention, the inside of the case is divided into a trap forming chamber on the front side and a rectifying passage forming section on the back side, and an inlet for airflow is provided at one end of the trap forming chamber, and this inlet is formed. At the other end of the trap forming chamber opposite to the surface formed, an air flow outlet is provided, and at the center of the trap forming chamber, a partition wall for substantially equally dividing the trap forming chamber into an inlet space and an outlet space is provided. Provided, in the entrance side space, a rectangular frame-shaped obstacle member is arranged in a form in which a corner portion faces the inlet of the air flow, and an air passage is formed between the obstacle member and the wall surface of the trap forming chamber, A first trap wall that captures dust in the airflow is formed at least on the airflow collision surface of the obstacle where the airflow entering from the entrance abuts, and the airflow abuts on the obstacle and moves downward. In the opposite flow area, the trap formation chamber The terms is projected to the air passage 2
A trap wall is provided, and a corner of the obstruction member on the side opposite to the corner on the entrance side of the square-shaped air flow is opened so that the air flow enters the square-frame-shaped inner space, A communication hole that communicates the inlet side space of the trap forming chamber in the case with the rectifying passage forming portion on the back side is formed at a position near the inlet of the air flow in the square frame-shaped inner space. In the outlet side space, the same configuration including the obstacle member, the first trap wall, the second trap wall, and the communication hole in the inlet side space with the partition wall as the axis of symmetry is formed substantially symmetrically, The straightening passage forming portion on the rear surface side of the trap forming chamber is formed with a straight straightening straightening passage communicating the communication holes on the inlet side and the outlet side of the trap forming chamber in a straight line. With the configuration in which the air volume detection sensor is arranged, It is a means to attain.

In the present invention, the air flow entering from the inlet collides with the air flow collision surface of the obstacle, and at this collision, the air flow is disturbed between the plurality of trap walls formed on the air flow collision surface. Due to the turbulence of the flow, complicated flow changes occur, and the dust contained in the flow cannot follow the complicated flow change due to the action of the inertial force, and the complicated path change of the air flow As a result, it collides with the trap wall and is trapped by the trap wall, so that not only large dust but also small fine dust is effectively trapped and removed.

Further, when large air dust is contained in the air flow whose direction of flow has been changed downward before or after colliding with the air flow collision surface of the obstacle, the dust is reduced by its own weight. It falls and is captured by the second trap wall which projects into the downwardly flowing air passage. Even if dust having a relatively small particle diameter that flows without falling into the second trap wall due to its own weight is included in the flow, when the air flow curves downward and flows, the dust loses its inertia. Since the force tries to go straight in the tangential direction to the wind bending path, the wind deviates from the air bending path and is captured by the second trap wall. Then, clean air free from dust is sent out from the outlet side by being caught and removed by the first trap wall and the second trap wall.

In the present invention, since the air flow collides with the obstruction member and travels in the direction of the air flow through the space between the obstruction member and the case wall as an air passage, the air flow changes direction at 90 ° zigzag. Therefore, the pressure loss of the air flow can be reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The dust trap device of the present embodiment is provided in the air distribution passage 15 of the water heater shown in FIG. 6, and the system configuration of this water heater is shown in FIG.
The same reference numerals are used for the same parts as those described in the above, and the duplicated description is omitted.

FIGS. 1 and 2 show examples of various models of the dust trap device according to the present invention.

In these figures, an inlet 36 for introducing an air flow into the case 38 is provided at one of the left and right ends of the case 38.
Is provided, and an outlet 37 is formed on the wall surface on the opposite side of the case 38 from the left and right.

In the case 38, an obstacle member 40 facing the entrance 36 with a space therebetween is arranged. The shape of the obstacle member 40 can take various forms.
In FIG. 1A, a member having a square cross section is used.
Further, in FIG. 1 (b), it is formed by a plate member which is vertically suspended from the upper wall of the case 38. In FIGS. 2 (a) and 2 (b), the cross-sectional shape is a baseball baseball baseball. Is formed by a pentagonal member in the form of.

The surface of these obstacles 40 facing the inlet 36 is an air flow collision surface 41 against which the air flowing from the inlet 36 collides, and a plurality of first trap walls 42 Are formed to protrude.

The space formed between the obstacle member 40 and the wall surface of the case 38 forms an air passage 43. In the example shown in FIG. 1, after the flow of the air entering from the inlet 36 collides with the air collision surface 41 of the obstacle member 40, the air flow 43
A second trap wall 44 protruding toward the side is formed.

Further, the apparatus shown in FIG.
No. 0 plate member is suspended from the upper surface wall of the case 38,
After the air flow introduced from the inlet 36 collides with the air flow collision surface 41, the passage along the upper wall side of the case 38 is shut off, and the air flow is regulated so as to be forced downward. ing.

In the embodiment shown in FIG. 2,
After the airflow introduced from the inlet 36 collides with the airflow collision surface 41 of the obstacle member 40, the airflow is branched into a downward flow and an upward flow.
A third trap wall 45 is additionally formed to protrude from the wall surface of the case 38 into the air passage.

In the embodiment shown in FIG.
The flow of air entering from the inlet 36 collides with the air flow collision surface 41 of the obstacle member 40 and is disturbed. The complicated turbulence of the flow causes a complicated change in the direction of the air flow. Even if the dust contains fine dust, the inertia force of the dust tends to go straight in the tangential direction of the air flow path. The minute dust collides with the first trap wall 42 and is captured and removed.

Therefore, the flow toward the outlet 37 through the upper side of the obstacle member 40 is a clean air flow containing no dust. When large air dust is contained in the flow of air entering from the inlet 36, the large dust falls by its own weight and falls into the second trap wall 44 before colliding with the air flow collision surface 41 and is captured. Is done.
Also, even if dust of an intermediate size is included in the flow of air, the dust is captured and removed by the first trap wall 42 in the same manner as in the case of the fine dust,
Even if it remains in the airflow without being caught, after the collision at the airflow collision surface 41, the downwardly directed airflow changes the direction of the flow, so that the dust of the intermediate size is subjected to its inertial force. As a result, it deviates from the flow path of the wind and collides with the second trap wall 44 to be trapped and removed, whereby it is possible to send out clean air free of dust components from the outlet 37. .

It should be noted that the first trap wall 42 is
Although it may be formed in a form projecting straight out of the box, bending the tip side as shown in FIG. 1A is effective for stably capturing and maintaining without capturing captured dust.

In the case of the embodiment shown in FIG.
The dust trapping and removing action is performed in the same manner as in the case of FIG. 1 (a), but the one shown in FIG. 1 (b) forcibly lowers the air flow colliding with the air flow collision surface 41 in the downward direction. Since the dust is captured and removed by the second trap wall 44 by the flow, the air flow entering from the inlet 36 is subjected to the first-stage dust removal action by the first trap wall 42 and the second trap wall 44. Since the second-stage dust trapping and removing operation is performed, it is possible to reliably remove dust in the airflow.

In the case of FIG. 1B as well, the second trap wall 44 may be projected straight, but as shown in the drawing, the trapped dust escapes by bending the tip side. And the effect of stably maintaining the state of capturing dust can be enhanced.

The embodiment shown in FIG.
As in the case shown in FIG. 1, the first trap wall 42 and the second trap wall 44 use the change in the flow path that flows downward when the air flow collides with the airflow collision surface 41 and after the collision,
Due to the inertial force, the direction of the dust flow is deviated from the path of the air flow to capture and remove the dust. However, in the embodiment shown in FIG. Using the path change of the flow in which the flow is directed upward, the dust deviates from the path of the air flow due to its inertial force and collides with the third trap wall 45 to capture the colliding fine dust. By providing the third trap wall 45, the effect of trapping and removing dust in the airflow can be more reliably improved.

In the embodiment shown in FIG. 2, the upper and lower air flow collision surfaces 41 are along the direction of the air flow, so that the pressure loss of the air flow can be further reduced. Things. In addition, as shown in FIG. 2A, by bending the first trap wall 42 in a hook shape,
The effect of capturing dust when the air flow collides with the air flow collision surface 41 can be further enhanced.

The dust trap device shown in FIGS. 1 and 2 maintains the vertical relationship shown in each of the drawings, with the inlet 36 side as the air chamber 14 side in FIG. 6 and the outlet 37 side as the air volume detection sensor 16. The dust trap device of this embodiment is interposed in the air distribution passage 15 on the upstream side of the air flow detection sensor 16 on the side of the air flow detection sensor 16. The removed clean air is led to the air flow detection sensor 16 side, and the air flow detection sensor 16
This makes it possible to reliably prevent dust from adhering to the air volume detection unit.

Incidentally, the form of the obstacle member 40 provided in the case 38 can take various forms other than those shown in FIGS. 1 and 2, and one example is shown in FIG.
FIG. 3A shows the obstruction member 40 having a circular cross-sectional shape, and FIG. 3B shows the obstruction member 40 having a triangular cross-sectional shape. FIG. 4C shows the obstruction member 40 having a vertically elongated elliptical cross section, and FIG. 4D shows the obstruction member 40 having a horizontally oblong cross section. The obstruction member 40 has an elliptical shape, and the form of the obstacle member 40 can be other than those shown in FIG. In FIG. 3, the trap walls 42, 44 and 45 and the outlet 37 shown in FIGS. 1 and 2 are not shown.

FIG. 4 shows an embodiment of a dust trap device in which the air volume detection sensor 26 is incorporated. 5, the interior of the case 38 is divided into a trap forming chamber 47 on the front side and a rectifying path forming part 48 on the back side via a partition wall 46, as shown in FIG. An air flow inlet 36 is formed on one end wall surface, and an air flow outlet 37 is formed on the other end wall surface opposite to the trap forming chamber 47.

In the center of the trap forming chamber 47, there is provided a section wall 34 for partitioning the trap forming chamber into an entrance space 50 and an exit space 51. The entrance space 50 has a rectangular frame shape. The obstruction member 40 is disposed in a state where its square corner is opposed to the entrance 36 with a space therebetween. A region of a corner of the obstacle member 40 opposite to the corner 52 toward the square frame-shaped entrance 36 is opened by providing an opening 53. The square frame of the obstacle member 40 and the trap formation chamber 47 are formed. The space formed between the wall and the inlet side space 50 forms an air passage 43 for the air flow.

As shown in FIGS. 4 and 5, a communication hole 54 for communicating the trap forming chamber 47 and the rectifying passage forming portion 48 is provided.
Is formed near the corner 52 (in the vicinity of the corner 52) in the square frame of the obstacle member 40. In this embodiment, as shown in FIG. 5, when the flow of air enters the straightening passage forming portion 48 from the inlet side space 50, the flow of air is curved and gradually enters.
The partition wall 46 of the portion forming 4 is bent obliquely downward.

In the example shown in FIG. 4 as well, the first trap wall 42 is provided on the airflow collision surface 41 of the obstacle member 40, and the second trap wall 42 is provided on the case 38 side, as in the case shown in FIGS. A trap wall 44 and a third trap wall 45 are formed, respectively.

Further, in the example shown in FIG.
A trapping wall 55 is also formed on the rear side piece 49 of a square frame shape following 1 and on the wall surface of the partition wall 34, so that the first trapping wall 42, the second trapping wall 44, and the third trapping wall 45
Even if dust in the air flow remains without being trapped by the air flow, the dust remaining in the air flow is captured and removed by the change in the air flow bending and the departure from the flow path due to the inertia of the dust due to the bending change. I am trying to do it.

Although not shown in FIG. 4, the obstruction member 40, the first trap wall 42, the second trap wall 44, and the third A component portion including the trap wall 45 is provided. The component portion formed in the outlet side space 51 is the same as the component portion formed in the entrance side space 50, and the partition wall 34 is formed by a symmetrical axis. , And are not shown in FIG.

In the outlet side space 51, a communication hole 56 communicating with the rectifying passage forming portion 48 and the trap forming chamber 47 in the outlet side space is provided symmetrically with the communication hole 54 formed in the inlet side space 50. It is formed in the same form as the communication hole 54. The communication hole 5 is formed in the rectifying passage forming portion 48.
A flow straightening passage 57 is formed to connect the straight lines 4 and 56 with a straight rectilinear passage, and the air flow detecting sensor 16 is provided at an intermediate position of the straightening passage 57.

In the embodiment shown in FIG. 4, the flow of air entering from the inlet 36 collides with the air flow collision surface 41 of the obstacle member 40, and the dust component contained in the air flow is captured by the first trap wall 42. With respect to the air flow further upward, fine dust components are removed by the third trap wall 45, and further downstream of the trap wall 55
This captures and removes dust components. Similarly, the dust component in the flow of air that collides with the airflow collision surface 41 and goes downward is captured and removed by the second trap wall 44, and the remaining dust component is removed by the trap wall 55 in the next stage. Then, the clean air from which the dust component has been removed enters the rectifying passage 57 through the communication hole 54, and the flow of the air rectified by the rectifying passage 57 is changed by the air volume detection sensor 16.
The air flow detection sensor 16 detects the air flow by touching a stable rectified air flow having no fluctuation in the flow velocity. The flow of air passing through the rectifying passage 57 is
6 again enters the outlet side space 51 and is sent out from the outlet 37 through an air passage formed between the obstacle member and the case wall surface.

The configuration of the dust trapping and removing provided in the outlet side space 51 of this embodiment is such that when a headwind enters from the outlet 37, the dust component contained in the flow of the headwind is removed to detect the airflow. 16 is to prevent dust contained in the headwind from adhering.

In the embodiment shown in FIG. 4, dust components contained in the flow of air are completely captured and removed by the trap passages 42, 44, 45, and 55, and the straightening passage 57 is formed as a long passage section. Thus, the flow of the air flowing into the rectifying passage 57 from the communication hole 54 can be surely rectified and guided to the air volume detection sensor 16.
The air volume detection sensor 16 enables accurate and accurate air volume detection without being affected by fluctuations in the air flow velocity. In particular, in this embodiment, as shown in FIG. 5, since the flow of the air entering the rectifying passage 57 through the communication hole 54 is made smooth, the turbulence of the air entering the rectifying passage 57 from the inlet side space 50 can be suppressed as much as possible. Since the flow of the air flowing out of the communication hole 54 can be quickly rectified, the rectifying effect of the air flow by the rectifying passage 57 can be sufficiently enhanced.

The dust trap device shown in FIG.
The inlet 36 side is set to the air chamber 14 side of the water heater shown in FIG. 6, and the outlet 37 side is set to the combustion chamber 3 side to be interposed in the air distribution passage 15.

The present invention is not limited to the above embodiments, but can employ various embodiments. For example, in the above-described embodiment, an example in which the dust trap device is provided in the water heater is shown. However, the present invention can be applied to various other types of combustion equipment other than the water heater, for example, a bath kettle, a combined bath / water heater, and the like. Further, the present invention can be applied as a device for removing dust components in an air flow other than the combustion equipment.

[0052]

According to the present invention, a plurality of first trap walls provided on the air flow collision surface by causing the flow of air introduced from the inlet to collide with the air flow collision surface of the obstacle to change the air flow in a complicated manner. The structure is such that dust contained in the air flow is made to collide with and be trapped, so that dust components contained in the air flow can be captured and removed irrespective of the size of the dust.

Further, in a configuration in which a second trap wall projecting from the case wall surface into the air passage is provided at a portion of air flowing downward after colliding with the air flow collision surface, Before colliding with the airflow collision surface of the obstacle member, a large dust component is dropped into the second trap wall by its own weight to be reliably captured, and dust is colliding with the airflow collision surface and is directed downward in the air. Even if it remains, the dust contained in the air flow is caused to deviate from the air flow path by using the inertia force of the dust due to the change in the air flow path, and is caused to collide with the second trap wall. The trapping can be performed, and by providing the second trap wall, the effect of trapping and removing dust in the flow of air can be further enhanced.

Further, since the second trap wall is provided below the first trap wall formed on the airflow collision surface of the obstacle, the dust trapped on the first trap wall accumulates on the first trap wall. Even when full, the first
The dust component overflowing from the trap wall and falling
Since it is captured by the trap wall and captured,
The problem that the dust component dropped from the trap wall is carried to the outlet along with the flow of the air flow can be effectively eliminated.

Further, in the dust trap device incorporating the air volume detection sensor according to the fourth aspect of the present invention, the flow of the air introduced from the inlet is caused to collide with the air flow collision surface of the obstacle member to make the first flow. Trapped and removed by the trap wall,
Further, the dust component contained in the downward flow colliding with the airflow collision surface is captured by the second trap wall, so that the dust component contained in the air flow can be reliably captured and removed. , The clean air can be reliably rectified through the long rectification passage and guided to the air flow detection sensor by capturing and removing dust components, so that the air flow detection sensor is accurate and accurate without being affected by the flow velocity. The effect that the air volume can be detected well can be obtained.

Furthermore, since the dust trap device of the present invention does not have a configuration in which a plurality of trap walls are arranged so as to be alternately overlapped with each other, the air flow alternately crooks the plurality of trap passages in a direction substantially perpendicular to each other. Therefore, since the air flows smoothly along the air passage, the pressure loss of the air flow is extremely small, and in spite of this, an excellent effect is obtained in that the effect of capturing and removing dust is high.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of various model examples of a dust trap device according to the present invention.

FIG. 2 is a configuration explanatory view of another model example of the dust trap device according to the present invention.

FIG. 3 is an explanatory view showing another example of the configuration of the obstacle member constituting the dust trap device according to the present invention.

FIG. 4 is an explanatory diagram of a configuration of an embodiment of a dust trap device incorporating an airflow detection sensor according to the present invention.

FIG. 5 is a detailed explanatory view of a cross section of a connection hole 54 in FIG. 4;

FIG. 6 is an explanatory diagram of a system configuration of a water heater in which the dust trap device of the embodiment is used.

FIG. 7 is an explanatory diagram of a configuration of a dust trap device studied by the applicant.

8 is a cross-sectional view of the communication holes 35a and 35b in FIG.

[Explanation of symbols]

 34 Partition Wall 38 Case 40 Obstacle Member 41 Airflow Collision Surface 42 First Trap Wall 43 Air Passage 44 Second Trap Wall 45 Third Trap Wall 47 Trap Forming Chamber 48 Rectification Path Forming Section 57 Rectification Path

Claims (4)

[Claims] An obstacle is provided in a case provided with an inlet and an outlet for an air flow at different positions and opposed to the inlet for the air flow and against which an air flow entering the case from the inlet abuts. The space between the case walls forms an air passage that guides the air flow to the outlet, and a first trap wall that captures dust in the air flow protrudes from an air flow collision surface of the obstacle that the air flow strikes. Dust trap device. 2. A case having an inlet and an outlet for an air flow provided at different positions, and an obstacle member against which the air flow entering the case from the inlet is disposed opposite to the inlet of the air flow. The space between the case walls forms an air passage that guides the air flow to the outlet, and a first trap wall that captures dust in the air flow protrudes from an air flow collision surface of the obstacle that the air flow strikes. A dust trap device provided with a second trap wall protruding from a case wall surface into an air passage at a flow portion where the air flow strikes the obstacle member and faces downward. 3. A structure in which a gap between an obstacle member and an upper inner wall surface of a case is closed to force a flow of air hitting an airflow collision surface of the obstacle member into a downward flow.
The dust trap device as described. 4. The inside of the case is partitioned into a trap forming chamber on the front side and a rectifying passage forming part on the back side, and an air flow inlet is provided at one end of the trap forming chamber, and is opposite to the surface on which the inlet is formed. The other end of the trap forming chamber is provided with an air flow outlet, and a partition wall is provided at the center of the trap forming chamber to substantially equally divide the trap forming chamber into an inlet space and an outlet space. In the side space, a rectangular frame-shaped obstacle member is arranged in a form in which a corner is opposed to the inlet of the air flow, and an air passage is formed between the obstacle member and the wall surface of the trap forming chamber, and air entering from the inlet is formed. A first trap wall that captures dust in the air flow is formed at least on the air flow collision surface of the obstacle member where the flow abuts, and a flow portion where the air flow abuts on the obstacle member and faces downward is formed. Protruding into the air passage from the wall of the trap formation chamber The projected second trap wall is provided, and the corner of the obstruction member on the side opposite to the corner on the inlet side of the rectangular air flow is opened to allow the air flow to enter the rectangular frame-shaped inner space. A communication hole is formed at a position of the square frame-shaped inner space near the inlet of the air flow, the communication hole communicating the inlet side space of the trap forming chamber in the case with the rectifying passage forming portion on the back side, Further, in the outlet side space of the trap forming chamber, the same configuration including the obstacle member, the first trap wall, the second trap wall, and the communication hole in the inlet side space is substantially symmetric with the partition wall as a symmetric axis. A straight-line straightening passage is formed in the straightening passage forming portion on the back surface side of the trap forming chamber, the straightening straight passage communicating with the communication holes on the inlet side and the outlet side of the trap forming chamber. In the middle part of the Wrap equipment.