JPH11141823A - Dust trap device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust trap device in which a high dust trapping effect can be attained, no clogging with dust after its long term use occurs and it can be easily manufactured. SOLUTION: A filter cylindrical member 32 is fitted to and inserted into a metallic outer cylindrical member 31 to form a complex cylinder member 33. A cylindrical hole of the complex cylindrical member 33 is applied as a trap passage 34, a plurality of trap protrusions 35 are displaced at a side wall of the trap passage 34 in a longitudinal direction, and they are protruded in a staggered manner there. A path for air flowing at the trap passage 34 is caused to bypass the trap protrusions 35 and then bent and deformed by them. Then, when a flow of air is bent and deformed, dusts contained in the air flow are removed from the path of air flow under its inertia force, struck against the trap protrusions 35, and then the dusts are caught and removed.

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. 5 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. 5, reference numeral 27 denotes a fan rotation detection sensor for detecting 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, it is conceivable to provide a dust trap device for capturing and removing dust in the air in the air distribution passage 15 upstream of the air flow detection sensor 16.

As this dust trap device, for example,
As shown in FIG. 6, a configuration in which a plurality of filters 30 are attached to the inside of the tubular body 28 at intervals in the longitudinal direction of the tubular body 28 may be considered. By arranging a dust trap device as shown in FIG. 6 in the air distribution passage 15 on the upstream side of the airflow detection sensor 16, the air distribution passage 16 is provided.
When the air flows toward the air volume detection sensor and passes through the dust trap device,
As a result, the dust component is removed, and clean air can be supplied to the air volume detection sensor 16 side.

However, as shown in FIG. 6, the operation of attaching a plurality of filters 30 to the inside of the tubular body 28 at intervals is very complicated, and the production efficiency of the dust trap device is reduced. Occurs.

Further, while the dust trap device is used for a long period of time, dust is trapped and accumulated in the filter 30 and clogging progresses. Once the clogging state is reached, the flow of air does not pass. A problem arises in that the air volume detection sensor 16 cannot detect the air volume of the combustion air.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a dust trap which has good production efficiency and does not block the air flow due to clogging even when used for a long time. It is to provide a device.

[0013]

In order to achieve the above object, the present invention takes the following measures. That is,
According to a first aspect of the present invention, a composite tubular member is formed by inserting a filter tubular member made of a filter material into a tubular hole of an outer tubular member, and the tubular hole of the filter tubular member serves as a passage passage for flowing air. The problem is solved by a configuration in which a plurality of trap projections are formed on the side wall of the composite cylinder member so as to be displaced in the cylinder length direction and project toward the inside of the trap passage.

According to a second aspect of the present invention, in the apparatus having the configuration of the first aspect, the trap protrusion is formed by expanding a side wall of the composite tubular member into the trap passage. It is a means to solve the problem.

Further, in a third aspect of the present invention, a trap hole for flowing air is formed through the cylindrical hole of the cylindrical member, and the inner wall of the trap passage is shifted in the longitudinal direction of the cylinder and protrudes inside the trap passage. Further, a configuration in which a plurality of trap projections are provided is a means for solving the problem.

Further, according to a fourth aspect of the present invention, an air trap passage is formed through the cylindrical hole of the cylindrical member, and the inner wall of the trap passage protrudes inside the trap passage with its position shifted in the cylinder length direction. A plurality of trap protrusions are provided, and an outer wall is attached to the outside of the side wall of the trap passage via a gap between the trap passage and a side wall of the trap passage. A return trap passage communicating with the outlet side is formed, and the return trap passage has a structure in which one or more passage curved portions protruding toward the trap passage are formed.

Further, the fifth invention is directed to the first or second embodiment.
Or, in those provided with the configuration of the third or fourth invention,
The protruding surface of the trap protruding portion is formed as a substantially semi-circular curved surface to solve the problem.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, the trap passage is formed as a conical passage having a diameter decreasing from the entrance side to the exit side, and The configuration is such that the diameter is reduced from the entrance side to the exit side of the trap passage to solve the problem.

Further, a seventh aspect of the present invention is the first to sixth aspects.
In any one of the above-described aspects, the trap protruding portions are arranged so as to alternately protrude from both side walls facing each other while being displaced in the cylinder length direction.

In the dust trap device of the present invention,
Since a plurality of trap protrusions are formed in the length direction of the trap passage, air passing through the trap passage flows along a path bypassing the trap protrusion when passing through each of the trap protrusions. When the air detours, the dust in the air collides with the trap protruding portion due to its inertia force and does not bend in the direction detouring the trap protruding portion and collides with the trap protruding portion, and dust components in the air are trapped It is captured and removed by the protrusion. Each time the wind flow bypasses the plurality of trap protrusions, the dust component is repeatedly trapped and removed, so that the air exiting the trap passage contains no dust component, and clean air is sent out from the trap passage.

As described above, the dust caught and removed by the trap projections adheres and accumulates on the trap projections, but a gap through which air flows is formed between the trap projections and the inner wall surface of the trap passage. Therefore, even if dust adheres and accumulates on the trap projection, the gap will not be closed, and even if the dust trap device is used for a long time, the air flow will not be shut off due to clogging, This enables a stable air flow at all times.

[0022]

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 this embodiment is provided in the air diverting passage 15 of the water heater shown in FIG. 5, and the system configuration of these water heaters is the same as that described in FIG. The same portions are denoted by the same reference numerals, and the description thereof will not be repeated.

FIG. 1 shows the configuration of the dust trap device according to the first embodiment of the present invention.

In the figure, a filter tube member 32 made of a cylindrical filter material is fitted and inserted into a tube hole of an outer tube member 31 made of a cylindrical metal pipe.
The center cylindrical hole of the composite cylindrical member 33, that is, the cylindrical hole of the filter cylindrical member 32 is a trap passage.

On both sides (opposing walls) of the composite tubular member 33, a plurality of trap projections 35 are formed which are displaced in the longitudinal direction of the cylinder and bulge inside the trap passage 34. The trap projection 35 is easily formed by pressing a press tool 36 having a circular curved surface at the tip end in a direction orthogonal to the cylinder wall, as shown by a chain line in FIG. is there.

The dust trap device of this embodiment is
One end is located on the air chamber 14 side shown in FIG. 5 and the other end is located on the air flow detection sensor 16 side, and is provided in the air distribution passage 15 at a position upstream of the air flow detection sensor 16.

According to this embodiment, as shown by the arrow in FIG. 1, the flow of the air entering from the inlet side of the dust trap device advances while meandering so as to bypass the trap protrusion 35, and the trap protrusion 35 When the wind flow detours around the wind, the dust 37 included in the wind flow has an inertial force and tends to go straight in the tangential direction of the wind flow path. Cannot be followed and collides with the trap protrusion 35 to be captured and removed.

In this embodiment, since a plurality of trap projections 35 are formed alternately in the length direction, the meandering of the flow of the wind is repeated, and every time the meandering of the wind, the dust 37 is trapped and removed. Since the airflow from the trap passage 34 does not include dust components, clean air is supplied to the airflow detection sensor 16 and the dust components adhere to the airflow detection unit of the airflow detection sensor 16. The problem can be solved without fail.

In particular, in this embodiment, since the wall surface of the trap passage 34 is formed of a filter material, the dust 37 colliding with the trap protrusion 35 is separated from the wall surface of the trap protrusion 35 by splashing or the like. The dust is reliably adsorbed without dust, so that the effect of capturing and removing dust is outstanding.

As shown in FIG. 6, the trap passage 34 does not have a structure in which the entire cross-sectional area of the passage is closed by the filter 30. Instead, the trap protrusion 35 on one side wall and the trap protrusion 35 on the opposite side wall are used. A gap 38 through which the wind passes is secured between them, so that even if the dust trap device is used for a long period of time, the trap passage 34 will not be blocked by the dust 37 and the air flow state will be stable. It is possible to maintain.

The form of formation of the trap projection 35 is not necessarily limited to that shown in FIG.
For example, as shown in FIG. 2, the pressing tool 36 is pressed from both side walls of the composite cylindrical member 33 in the direction A in the drawing, and pressed to make the trap projections 35 project from both sides, and further shifted in the length direction. In this case, the trap projection 35 may be formed by alternately performing press working in the A direction and the B direction in the length direction, such as pressing the press tool 36 from the B direction orthogonal to the A direction. Things.
In this case as well, a gap 38 for the air flow is secured between the trap projections 35.

FIG. 3 shows a second embodiment of the dust trap device according to the present invention. In the second embodiment, trap projections 35 are formed alternately in the length direction of the cylindrical member 40 from both side walls of the cylindrical member 40 made of an appropriate material such as metal or plastic. In this embodiment, the outer diameter of the cylindrical member 40 is reduced from the inlet side to the outlet side, and accordingly, the trap passage 34 is formed in a conical shape whose diameter is reduced from the inlet side to the outlet side. The radius of the trap protrusion 35 is also reduced from the inlet side to the outlet side.

In the second embodiment, similarly to the first embodiment, the flow of the wind from the inlet side to the outlet side of the trap passage 34 is meandered when passing through the trap projection 35, and the dust 37 is removed. Although the dust is captured and removed by using the inertia force of the trap passage, in the second embodiment, the diameter of the trap protrusion 35 is reduced from the entrance side to the exit side of the trap passage 34, so that the trap passage The size of the dust to be trapped and removed at the entrance side and the exit side of the trap passage 34 is such that the large-diameter dust 37 is trapped and removed at the entrance side of the trap passage 34 and the small-diameter dust 37 is trapped and removed at the exit side. Sharing (separating).

That is, at the entrance side of the trap passage 34,
Since the diameter of the projection of the trap projection 35 is large, the flow of the wind gently bypasses the projection 35 of the trap. Even if the minute dust receives the inertial force, the bending of the path is small. Although traveling along, large dust is deflected from the wind path and collides with the trap projection 35 to be trapped and removed even if the path is bent in a small path. On the exit side of the trap passage 34, the diameter of the trap projection 35 is reduced, so that the curve of the wind path that bypasses the trap projection 35 also has a small diameter and a large change in the curve. For this reason, even the minute dust is deviated from the curved path of the wind by the inertial force and collides with the wall surface of the trap projection 35 to be trapped and removed. Thus, the large dust is trapped at the entrance side. The fine particles are removed and trapped and removed at the outlet side, so that the air component exiting the trap passage 34 has no dust component, and clean air can be sent out.

In the second embodiment, the trap passage 34 is formed so that the cross-sectional area of the trap passage 34 becomes smaller from the inlet side to the outlet side. Therefore, the flow velocity becomes higher toward the downstream side, so that the dust As a result of the increased inertial force, the effect of capturing and removing minute dust is enhanced.
By narrowing the gap 38 between the trap projections 35 in the exit area of the trap passage 34, the flow velocity can be further increased to increase the inertia force of the dust, thereby further improving the dust capturing and removing effect. Is possible.

The dust trap device of the second embodiment can be easily manufactured by molding, and the production efficiency is greatly improved as compared with the case where a plurality of filters 30 are installed in the passage as shown in FIG. It is possible to do.

FIG. 4 shows a third embodiment of the dust trap device. The dust trap device of the third embodiment is a modification of the dust trap device shown in FIG.

In the dust trap device of the third embodiment, the cylindrical hole of the cylindrical member 40 is formed as a trap passage 34, and a trap projection 35 is formed from both side walls of the trap passage 34.
And a passage formed between the outer wall 43 and the side wall 41 is formed as a folded trap passage 44.
The folded trap passage 44 is formed with one or more passage curved portions 45 protruding toward the inner trap passage 34 side.

In the third embodiment, the trap passage 3
The dust contained in the flow of air passing through 4 causes the dust to collide with the trap projection 35 by using the inertia force of the dust during the meandering of the wind flow, as in the first and second embodiments. The dust mixed with the wind flow passing through the return trap passage 44 bends and changes the wind flow when passing through the curved passage portion 45, and the dust is removed by utilizing the inertia force of the dust. The air can be deviated from the curved path, collided with the wall surface of the passage curved portion 45, captured and removed, and clean air containing no dust component can be sent from the exit side of the return trap passage 44.

In the third embodiment, the folded trap passage 44 is formed by using the side wall of the trap passage 36, and the dust is captured and removed in both the trap passage 34 and the folded trap passage 44. Because
The effect that the length of the entire device can be shortened and compact can be obtained.

It should be noted that the present invention is not limited to the above embodiments, but can take various embodiments. For example, in the embodiment shown in FIG. 1 and FIG.
Was made the same from the inlet side to the outlet side. However, as shown in FIG. 3, for example, the trap passage 34 was formed in a conical shape so as to decrease in diameter from the inlet side to the outlet side. At the same time, the diameter of the trap projection 35 may be reduced toward the outlet side.

In the embodiment shown in FIG. 3, the trap passage 34 is formed in a conical shape, and the diameter of the trap projection 35 is reduced toward the outlet side.
As shown in FIG. 2, the diameter of the cylindrical member 40 may be the same from the inlet side to the outlet side, and the diameter of the trap projection 35 may be the same from the inlet side to the outlet side.

Further, as shown in FIG. 2, the projecting form of the trap projecting portion 35 is made to protrude from both sides of the side wall, and the position of the trap projecting portion 35 is shifted in the length direction so that the next stage trap projecting portion 35 projects from a direction different by 90 degrees. May be used.

Further, also in the embodiment shown in FIG. 4, the trap passage 34 is formed in a conical shape as shown in FIG. 3, and the diameter of the trap protrusion 35 is reduced from the entrance side to the exit side of the trap passage 34. This may be done. Further, the projecting direction of the trap projecting portion 35 is shown in FIG.
As in the embodiment shown in FIG.

Further, in the embodiment shown in FIGS. 1 and 2, the trap projection 35 is provided on the cylindrical hole wall of the composite cylindrical member 33 of the outer cylindrical member 31 and the filter cylindrical member 32. May be omitted, and the trap projection 35 may be formed on the cylinder hole wall (trap passage 34) by, for example, bulging the wall surface of the outer casing cylinder member 31.

Further, in this embodiment, as an example of use of the dust trap device, an example is shown in which the dust trap device is disposed in the air distribution passage 15 of a combustion device (water heater). It can be applied as a device for removing dust in a passage through which a gas such as air passes.

[0047]

According to the present invention, since a plurality of trap projections are formed on the inner wall of the trap passage in the lengthwise direction, the flow of air flowing through the trap passage is changed into a curved path bypassing the trap projection. Due to this change in the air flow, the dust contained in the air is deflected from the bent path of the air by using the inertia force of the air and collides with the trap projection to remove the dust contained in the air flow. Since the dust is trapped and removed, the dust is repeatedly trapped and removed every time the air flow bypasses the trap protrusion sequentially, so that the air exiting from the trap passage is sent as clean air without dust components. Is possible.

In particular, by forming the trap projections alternately in the length direction of the trap passage, it is possible to reverse the bending direction of the air flow, so that the dust trapping and removing effect can be further enhanced. Become.

Further, a folded trap passage is formed outside the side wall of the trap passage so as to communicate with the trap passage,
In the configuration in which the bent portion is formed in the return trap passage, dust is trapped and removed over both the trap passage and the return trap passage, so that the length of the trap passage can be shortened by that much, and furthermore, the return is achieved. Since the trap passage is formed so as to be attached to the side wall of the trap passage, the bulk of the folded trap passage portion can be reduced, thereby making it possible to reduce the size of the entire apparatus.

Further, in the case where the trap passage is formed in a conical shape and the diameter of the trap projection is reduced from the entrance side to the exit side of the trap passage, the trap projection on the large diameter side may be used. The dust contained in the air flow is efficiently shared according to the size of the trap projection, such as trapping and removing large dust components in the trap portion and trapping and removing minute dust components in the trap projection portion on the small diameter side. The effect of being able to capture and remove is obtained.

Further, in the present invention, dust is trapped and removed by utilizing the bending change of the ventilation path due to the trap projection and the inertia force of the dust. Since there is a gap between the trap protrusion and the opposing passage wall, the passage of the passage can be clogged and blocked when the entire passage cross section is closed with a filter. However, it is possible to allow the air to flow stably for a long period of time.

Further, since the dust trap device of the present invention can be easily manufactured by using press working or molding, the production efficiency of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a first embodiment of a dust trap device according to the present invention.

FIG. 2 is an explanatory view showing a modified example of a trap projection that projects into a trap passage.

FIG. 3 is a configuration explanatory view of a second embodiment of the present invention.

FIG. 4 is a configuration explanatory view of a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a system configuration example of a water heater in which the dust trap device of the present embodiment is installed and used.

FIG. 6 is an explanatory view of a dust trap device in which a filter 30 is provided in a passage through which air flows with an interval therebetween.

[Explanation of symbols]

 31 outer skin tubular member 32 filter tubular member 33 composite tubular member 34 trap passage 35 trap protrusion 40 tubular member (tubular member) 44 folded trap passage 45 passage curved portion

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Kondo 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd.

Claims (7)

[Claims] A composite tubular member is formed by inserting a filter tubular member made of a filter material into a tubular bore of an outer tubular tubular member, and the tubular bore of the filter tubular member serves as a trap passage for flowing air. A dust trap device, wherein a plurality of trap projections are formed on a side wall of the composite cylinder member so as to be shifted in a cylinder length direction and project toward the inside of the trap passage. 2. The dust trap device according to claim 1, wherein the trap projection is formed by expanding a side wall of the composite tubular member into the inside of the trap passage. 3. A trap passage for air flowing through a cylindrical hole of a cylindrical member, and a plurality of trap projections formed on the inner wall of the trap passage, the positions of which are shifted in the longitudinal direction of the cylinder and project to the inside of the trap passage. Dust trap device provided with. 4. A trap passage for air flowing through the cylinder hole of the tubular member, and a plurality of trap projections projecting to the inside of the trap passage with their positions shifted in the cylinder length direction on the inner wall of the trap passage. An outer wall is provided outside the side wall of the trap passage through a gap between the trap passage and the side wall of the trap passage, and the outer wall and the side wall of the trap passage communicate with the outlet side of the trap passage. A dust trap device, wherein a folded trap passage is formed, and one or more passage curved portions projecting toward the trap passage are formed in the folded trap passage. 5. The dust trap device according to claim 1, wherein the projecting surface of the trap projecting portion is formed in a substantially semicircular curved surface. 6. The trap passage is formed as a conical passage whose diameter decreases as it goes from the inlet side to the outlet side, and the trap protrusion has a diameter that decreases as it goes from the inlet side to the outlet side of the trap passage. The dust trap device as described. 7. The dust trap device according to claim 1, wherein the trap protruding portions are formed so as to protrude alternately from both side walls facing each other while being displaced in the cylinder length direction.