JP2000234513A - Deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily exchange an electric heating type metal catalyst carrier, to correspond with a required processing capacity without increasing a manufacturing cost, and to prevent insulation failure and sealing failure accompanied by thermal expansion of a center electrode of the electric heating type metal catalyst carrier. SOLUTION: This deodorization device has multiple catalyst units U1-U3 wherein an electric heating type metal catalyst carrier 30 is housed in a case 20 formed with a gas passage 23 exchangeably connected in series. Moreover, electrodes 31, 34 of each electric heating type metal catalyst carrier 30 are connected to a power source 60 in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing apparatus provided with an electrically heated metal catalyst carrier in which a metal catalyst carrier coated with a catalyst substance is configured to be able to generate heat.

[0002]

2. Description of the Related Art A deodorizing apparatus using a deodorizing catalyst is provided with an electric heater for raising the temperature of the catalyst to the activation temperature because the deodorizing or deodorizing ability of the catalyst is lowered at a temperature lower than the activation temperature. However, there was a limitation in miniaturization because the installation space for the heater had to be secured.

For this reason, in recent years, in order to make the catalyst carrier itself function as an electric heater and to eliminate the electric heater to reduce the size, the metal catalyst carrier coated with the catalyst substance itself is configured to be able to generate heat. A deodorizing device provided with an electrically heated metal catalyst carrier has been proposed.

[0004] The electrically heated metal catalyst carrier is housed in a metal case having a gas flow passage formed therein, and is formed by winding a center electrode and a metal foil member having a band shape around the center electrode in a cylindrical shape. And an external electrode. The center electrode extends along the gas flow direction in the metal case and has a central portion around which the metal foil member is wound,
A drawer that extends in a direction substantially perpendicular to the center and extends through the metal case to the outside. A ceramic adhesive or insulator that provides insulation between the extraction portion and the metal case and seals the processing gas is provided at a portion where the extraction portion of the center electrode penetrates through the metal case. Is fixed with a rigid structure.

[0005]

Gases having an irritating odor containing ammonia and the like are generally highly corrosive, so that the electrically heated metal catalyst carrier corrodes with the use of a deodorizing device, and the metal catalyst carrier is replaced. You may have to do something. However, none of the conventional deodorizing apparatuses equipped with an electrically heated metal catalyst carrier has been produced on the assumption that the metal catalyst carrier is replaced.

Further, the processing capacity required of the deodorizing device, such as the amount of gas that can be processed per unit time, varies greatly depending on the use environment. Conventionally, when producing a deodorizing device according to the processing capacity, it is necessary to simply change the size of the metal catalyst carrier, and it is necessary to produce a plurality of types of metal catalyst carriers. There was a problem that caused an increase.

The central electrode of the electrically heated metal catalyst carrier has a central portion and a lead portion extending in a direction substantially perpendicular to the central portion, and at an operating temperature (about 400 ° C.). Thermally expands in two directions substantially perpendicular to the axial direction and the radial direction extending outward from the center. However, since the center electrode and the metal case are fixed in a rigid structure via a ceramic adhesive or insulator, thermal stress due to thermal expansion concentrates on this portion and is destroyed, resulting in poor insulation and poor sealing. There is a possibility of inviting.

The present invention has been made in order to solve the problems associated with the above-mentioned conventional technology, and is a deodorizing apparatus provided with an electrically heated metal catalyst carrier. Provided is a deodorizing apparatus which can cope with a required processing capacity without increasing a manufacturing cost and which can surely prevent insulation failure and sealing failure due to thermal expansion of a center electrode of an electrically heated metal catalyst carrier. With the goal.

[0009]

According to the first aspect of the present invention, there is provided an electrically heated metal catalyst comprising a metal catalyst carrier coated with a catalyst substance capable of generating heat. In the deodorizing device including the carrier, a plurality of catalyst units accommodating the electrically heated metal catalyst carrier are connected in series and exchangeably in a case in which a gas flow path is formed, and the electric heating metal catalyst carrier of each electrically heated metal catalyst carrier is connected. An electrode is connected in parallel to a power supply unit.

According to a second aspect of the present invention, there is provided an electric heating type electric power supply device comprising: a current limiting means provided on a power line for supplying a current to an electrode of each of the catalyst units; It is characterized by further comprising temperature detecting means disposed downstream of the metal catalyst carrier, and control means for controlling the operation of the current limiting means based on the temperature detected by the temperature detecting means.

Further, in the invention according to a third aspect, the electrically heated metal catalyst carrier may include a central portion extending along a gas flow direction in the case, and a central portion extending substantially perpendicular to the central portion. A center electrode having a lead portion that is extended and drawn out of the case, and one end of a band-shaped metal foil member is attached to the center portion of the center electrode, and the metal foil member is placed around the center portion. A catalyst support configured to be wound in a cylindrical shape; and an external electrode electrically connected to an outer peripheral portion of the catalyst support in a cylindrical shape. A non-joining portion that is not joined to the case is provided near the center portion of the center electrode, and a sliding portion is provided to allow the lead portion of the center electrode to slidably pass through the case.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural view showing an embodiment of a deodorizing apparatus according to the present invention, FIG. 2 is a sectional view showing one catalyst unit constituting the deodorizing apparatus, and FIG. FIG. 4 is a plan view showing the catalyst carrier portion, and FIG. 5 is a cross-sectional view showing a configuration of a sliding portion for slidably passing a center electrode through a case. is there.

As shown in FIG. 1, the deodorizing apparatus of the present embodiment comprises a deodorizing apparatus 10 having an electrically heated metal catalyst carrier 30 in which a metal catalyst carrier coated with a catalytic substance is configured to be able to generate heat. The present invention can be used in any place where a gas containing an irritating odor component is generated, for example, in a toilet, a living room, a hospital, a kitchen, a painting factory, or an animal breeding room. When used in toilets, air near the toilet bowl can be introduced to deodorize ammonia odors, and when used in a paint shop, air in the paint booth can be introduced to remove organic solvent odors. Can deodorize.

The deodorizing apparatus 10 according to the present embodiment, roughly described, has a catalyst unit U (U1) in which an electrically heated metal catalyst carrier 30 is accommodated in a case 20 in which a gas flow passage 23 is formed.
To U3) are connected in series and interchangeably, and the electrodes 31 and 34 electrically connected to the respective electrically heated metal catalyst carriers 30 are connected in parallel to the power supply unit 60. is there.

The electrically heated metal catalyst carrier 30 comprises a center electrode 31 and a metal foil member 32 formed in a band around the center electrode 31 in a cylindrical shape.
And an external electrode 34 that is electrically connected to the outer peripheral portion of the cylindrical catalyst carrier portion 33. The center electrode 31 extends in the gas flow direction in the case 20 and has a central portion 31a around which the metal foil member 32 is wound, and a central portion 31a extends in a direction substantially orthogonal to the central portion 31a.
0, and a drawing portion 31b that is drawn out to the outside. The lead portion 31 b of the center electrode 31 is connected to the positive pole of the power supply unit 60, and the external electrode 34 is connected to the negative pole of the power supply unit 60.

As shown in FIG. 3, the catalyst carrier portion 33 of the electrically heated metal catalyst carrier 30 is composed of a metal flat foil 32a having an insulating film formed on at least one surface and a metal corrugated foil 32b, and one end thereof. As shown in FIG. 4, it is attached to the center 31a of the center electrode 31 and wound around the center 31a to form a honeycomb-shaped metal foil laminate. The metal foil member 32 is also referred to as Kanthal, and is formed of an iron-based alloy including chromium, aluminum, and iron. Further, a current path having a predetermined electric resistance value is formed in the catalyst carrier section 33, and when electricity is supplied to the catalyst carrier section 33 via the center electrode 31 and the external electrode 34, Joule heat is generated in the current path. As a result, the temperature of the catalyst carrier 33 rises to the catalyst activation temperature, and the catalytic reaction is promoted.

Referring to FIG. 2, one catalyst unit U
Has a case 20 for accommodating the above-mentioned electrically heated metal catalyst carrier 30, and this case 20 comprises a first case body 21.
And a large diameter portion 21 formed on the upper part of the first case body 21
a and a second case body 22 whose lower end is connected to a. A large-diameter portion 22a is also formed on the upper portion of the second case body 22, and the lower end of the first case body 21 of the stacked upper-side catalyst units U is connected to the large-diameter portion 22a. I have. Both ends of each of the case bodies 21 and 22 are opened, and a gas flow passage 23 is formed in a case 20 connecting the two case bodies 21 and 22. Further, a temperature detecting means is attached to the catalyst unit U at a position downstream of the electrically heated metal catalyst carrier 30 in the gas flow direction. This temperature detecting means comprises, for example, a thermocouple 61 generally used for temperature measurement.

The catalyst carrier 33 is provided on the first case body 21 part.
Is accommodated, and its outer peripheral portion is in contact with the inner peripheral surface of the first case body 21. The through hole 2 is formed in the outer peripheral wall of the second case body 22.
4 are formed, and the lead-out portion 3 of the center electrode 31 is formed in the through hole 24.
1b penetrates. First and second case bodies 21 and 22
Is made of a conductive material such as stainless steel, and an external electrode 34 is formed integrally with the first case body 21. The first case body 21 and the second case body 22 are joined by a heat-resistant sealant 25 or a heat-resistant seal tape 26.
Are joined through.

Center electrode 31 and conductive second case body 22
Is electrically insulated from each other, and a gap between the through hole 24 and the center electrode 31 needs to be sealed to prevent gas flowing in the case 20 from leaking to the outside. As described above, as the temperature rises, thermal expansion in the axial direction occurs at the central portion 31a of the central electrode 31, and thermal expansion occurs in the radial direction at the extraction portion 31b. When the electrode 31 and the second case body 22 are fixed in a rigid structure, thermal stress due to thermal expansion in two directions perpendicular to each other concentrates on the electrode penetrating portion, and the ceramic adhesive or the like is broken. is there.

Therefore, in the present embodiment, the wound metal foil members 32 of the electrically heated metal catalyst carrier 30 are connected to each other in order to prevent insulation failure and sealing failure due to thermal expansion of the center electrode 31. A non-joining portion 36 that is not joined is provided in the vicinity of the center portion 31a of the center electrode 31 (see FIG. 4), and further, a sliding portion that allows the lead portion 31b of the center electrode 31 to slidably penetrate the second case body 22. 40 are provided (see FIG. 5).

More specifically, the metal foil member 32 is displaced in the axial direction on the end face in the axial direction of the catalyst carrier portion 33 in which the metal foil members 32 are stacked in a honeycomb shape, as shown by imaginary lines in FIG. In order to prevent this, a ceramic joint portion 35 in which the wound metal foil members 32 are joined to each other is provided. The ceramic bonding portion 35 is formed by applying an adhesive dispersed in alumina-based water to an axial end face, and by baking the adhesive, the moisture is removed, and the metal foil members 32 are bonded to each other while leaving only the alumina. is there. In the illustrated example, ceramic joints 35 are provided at eight locations at equal intervals in the circumferential direction. Each ceramic joining portion 35 is provided along a radial direction from the outer peripheral portion toward the central portion 31a of the center electrode 31. However, for several layers near the center 31a,
No ceramic joint 35 is provided. As a result, the non-joining portion 36 that does not join the wound metal foil members 32 to each other is provided near the center portion 31a of the center electrode 31. In the non-joined portion 36, the metal foil member 32 is allowed to be slightly displaced along the axial direction. The amount of axial displacement allowed for the metal foil member 32 in the vicinity of the central portion 31a is one enough to absorb thermal expansion.
mm.

On the other hand, an example of the configuration of the sliding portion 40 is as shown in FIG. 5. The sliding portion 40 has a center hole 41a into which the lead portion 31b of the center electrode 31 is slidably inserted. A bolt portion 41 is inserted into the through hole 24 of the second case body 22 from the inside, and a center hole 42a into which the lead portion 31b is slidably inserted is formed in the male screw 41b formed in the bolt portion 41. A cap nut portion 42 in which a female screw 42b to be fastened is formed on the inner peripheral surface, and an insulating seal packing 43 inserted into the drawer portion 31b and interposed between the tip of the bolt portion 41 and the cap nut portion 42. Have. Also, a sealing member such as an O-ring 44 for sealing between the bolt portion 41 and the through hole 24 of the second case body 22 is provided. The bolt portion 41 and the cap nut portion 42 are formed of insulating ceramic or the like, and the insulating seal packing 43 is formed of rubber, ceramic wool, or the like. In the sliding portion 40 having such a configuration, the lead portion 31b of the center electrode 31 is provided with the center hole 41.
a and 42a are slidable in the left-right direction in the drawing, and the drawer 31b is allowed to slightly shift in the radial direction. The radial displacement allowed for the lead portion 31b is about 1 mm, which is sufficient to absorb thermal expansion. Further, in the sliding portion 40, electrical insulation between the lead portion 31 b of the center electrode 31 and the second case body 22 is ensured by the insulating seal packing 43 and the insulating bolt 41, and the like. The gap is sealed by the packing 43 or the like.

In the deodorizing apparatus 10 shown in FIG. 1, three catalyst units U shown in FIG. 2 are connected in series and housed in a casing 11 made of a heat insulating material. In the following description, for the sake of convenience, the lowermost one of these three catalyst units U will be referred to as the first catalyst unit U.
The catalyst unit U1, the one located at the middle stage is the second catalyst unit U2, and the one located at the top stage is the third catalyst unit U
No. 3.

A lower flange portion 12 and an upper flange portion 13 are provided at both upper and lower ends of the casing 11, and a bottom plate 14 having a gas inlet 14a is fastened to the lower flange portion 12 by bolts. The cover plate 15 formed with the gas outlet 15a is bolted. The bottom plate 14 is provided with a cylindrical lower guide cylinder 16 having a gas passage formed therein so as to surround the gas introduction port 14a, and a large-diameter portion 16a formed above the lower guide cylinder 16 has a first catalyst unit U1. Of the first case body 21 is connected. Further, a cylindrical upper guide cylinder 17 having a gas passage formed in the cover plate 15 is also provided so as to surround the gas outlet 15a, and the lower end of the upper guide cylinder 17 is connected to the third catalyst unit U3.
Is connected to the large diameter portion 22a of the second case body 22. In the gas passage of the lower guide cylinder 16, a filter 18 formed of a nonwoven fabric or the like is disposed to remove dust and dirt contained in the introduced gas.

An air blowing means F is arranged on the way of the outlet duct 52 connected to the gas outlet 15a. The blowing means F is composed of a fan, a pump, and the like, which are driven to rotate by an electric motor. When the fan F is operated, the gas containing the irritating odor component is introduced into the lower guide cylinder 16 from the gas inlet 14a through the inlet side duct 53,
While flowing from the first catalyst unit U1 to the third catalyst unit U3, the catalyst is deodorized by the action of the catalyst. The deodorized gas is guided from the upper guide cylinder 17 through the gas outlet 15a to the outlet duct 52, and is blown out from the end of the duct 52 toward a predetermined indoor or outdoor position.

When the gas is circulated in the deodorizing device 10, the blowing means F is not a push-in type provided on the inlet side but a suction type provided on the outlet side for the following reason. That is, the suction type is used in order to reduce the corrosion of the fan F and the like by corrosive gas, so that it is not necessary to use an expensive fan F having improved corrosion resistance, and a low-cost general fan is used. This is to enable the use of F.

In particular, in the deodorizing device 10 of the present embodiment, between the first catalyst unit U1 and the second catalyst unit U2, and between the second catalyst unit U2 and the third catalyst unit U3
Are removably joined. The detachable joining structure is not particularly limited, but may be joined via a heat-resistant sealing tape, for example. Specifically, the first case body 21 and the second case body 22
And the lower catalyst unit U1 (U
A heat-resistant insulating seal tape 54 is wound around the outer periphery of the connection between the second case body 22 in 2) and the first case body 21 in the upper catalyst unit U2 (U3).

In the illustrated example, the lower guide tube 16 is provided between the first catalyst unit U1 and the lower guide tube 16 and between the third catalyst unit U3 and the upper guide tube 17 instead of winding the heat-resistant seal tape. A sealing member such as an O-ring 55 is interposed between the large diameter portion 16a of the cylinder 16 and the lower end of the first case body 21 of the first catalyst unit U1, and the large diameter of the second case body 22 of the third catalyst unit U3. A seal member such as an O-ring 56 is also interposed between the portion 22a and the lower end of the upper guide cylinder 17. These seal members 55 and 56 are pressed when sandwiching the three catalyst units U between the bottom plate 14 and the cover plate 15 and exhibit a predetermined sealing function.

As a detachable joining structure between the catalyst units U, instead of winding a seal tape, a large diameter portion 2 of the second case body 22 is used in the same manner as described above.
A configuration in which a seal member is interposed between 2a and the lower end of the upper first case body 21 may be employed.

Further, as shown in FIG. 1, the deodorizing device 10 of the present embodiment includes an electrode (the center electrode 31) of the catalyst unit U.
And current limiting means 62 (62a, 62b, 6) provided in each of the power lines for flowing a current to the external electrodes 34).
A control device (control means) 63 for controlling each operation of the current limiting means 62 based on the temperature detected by each of the thermocouples 61 as temperature detecting means;
Have.

The current limiting means 62 comprises a switch which is turned on and off, a switch with a timer, and the like. C
The control device 63 composed of a PU or the like outputs an OFF signal to the switch 62 if the temperature detected by each thermocouple 61 is equal to or higher than a set temperature (for example, 400 ° C.), and switches an ON signal if the temperature has not reached the set temperature. 62.

In order to suppress the deterioration of the deodorizing performance at the start of the operation, the time required for the temperature of the electrically heated metal catalyst carrier 30 to rise may be reduced, and even in the standby state where the fan F is stopped. It is desirable to keep the electrically heated metal catalyst carrier 30 at a certain temperature. For this reason, even in the case of the standby state, the control device 63 controls the electrically heated metal catalyst carrier 3 at predetermined time intervals.
0 is supplied and the temperature is kept at the standby temperature.

The operation of the embodiment will be described.

When the operation switch of the deodorizing device 10 is turned on, the driving of the fan F by the electric motor is started, and the control device 63 turns on all the switches 62. As a result, each electrically heated metal catalyst carrier 30 kept at the standby temperature is energized and heated to the catalyst activation temperature to promote the catalytic reaction.

On the other hand, when the fan F is driven, the gas containing the irritating odor component is taken into the inlet duct 53 and flows into the lower guide cylinder 16 via the gas inlet 14a. After the dust or the like is removed by the filter 18, the gas containing the irritating odor component is converted into the first, second, and third catalyst units U1, U2, and U3.
And it is deodorized by a catalytic reaction. The deodorized clean gas flows into the outlet duct 52 from the upper guide cylinder 17 via the gas outlet 15a, and is blown out toward a predetermined position.

As an example of the production of the electrically heated metal catalyst carrier 30, the catalyst capacity is 0.8 liter, the diameter is 100 mm,
The length in the axial direction is 102 mm, and the electric resistance value is 1.3Ω. This electrically heated metal catalyst carrier 30 reached 400 ° C. after 13 minutes as a result of applying a potential of 24 volts.

Using the deodorizer 10 of the present embodiment in which three catalyst units U1 to U3 having the above-mentioned electrically heated metal catalyst carrier 30 are connected in series, air containing 1000 ppm of ammonia is supplied at a rate of 40 liters per minute. As a result of the treatment, the blown air was odorless, and a predetermined deodorizing effect was obtained.

During operation, the gas temperature at the outlet side of the electrically heated metal catalyst carrier 30 is detected by the thermocouple 61. The control device 63 controls on / off of the switch 62 based on the temperature detected by the thermocouple 61 so as to maintain the outlet gas temperature at a preset temperature (for example, 400 ° C.).

The gas flowing down from the first catalyst unit U1 to the second catalyst unit U2 is already heated while flowing through the electrically heated metal catalyst carrier 30 of the first catalyst unit U1. Therefore, the electric power to be supplied to the electrically heated metal catalyst carrier 30 of the second catalyst unit U2 may be smaller than that of the first catalyst unit U1. Therefore, the switch 62b for the second catalyst unit U2 has a longer off time than the switch 62a for the first catalyst unit U1.

Similarly, the gas flowing down from the second catalyst unit U2 to the third catalyst unit U3 is already heated while flowing through the first and second catalyst units U2. Electric power supplied to the heated metal catalyst carrier 30 may be further reduced. Therefore, the switch 62c for the third catalyst unit U3 has a longer OFF time than the switches 62a and 62b for the first and second catalyst units U2.

Such switches 62a, 62b, 62
By the operation of c, no excessive power is supplied to the electrically heated metal catalyst carrier 30 of each of the units U1 to U3,
Power consumption of the entire deodorizing device 10 can be reduced.

When the electrically heated metal catalyst carrier 30 of the first catalyst unit U1 located at the uppermost stream in the gas flow direction is corroded or contaminated with use, the first catalyst is operated as follows. Replace unit U1. First, the bottom plate 14 or the lid plate 15 is removed from the casing 11 and the three joined catalyst units U1 to U3 are connected to the casing 11.
Take out from inside. Next, the seal tape 54 joining the first catalyst unit U1 and the second catalyst unit U2 is peeled off, and the first catalyst unit U1 is removed from the second and third catalyst units U2, U3. Then, the new catalyst unit U is placed on the upper side of the second catalyst unit U2, and the new catalyst unit U and the second catalyst unit U2 are joined by the seal tape 54. If the three catalyst units with the new catalyst unit U connected at the top are accommodated in the casing 11 again and the removed bottom plate 14 or cover plate 15 is attached to the casing 11, the replacement of the used catalyst unit U1 can be performed. Is completed. After the replacement work is completed, the second catalyst unit U2 before replacement is replaced with the first catalyst unit U at the lowermost stage.
1 and the third catalyst unit U3 before replacement is
The catalyst unit U2 becomes the catalyst unit U2, and the newly joined catalyst unit U becomes the third catalyst unit U3 at the top.

As described above, according to the present embodiment, a plurality of catalyst units U having the same configuration are connected in series to constitute the deodorizing apparatus 10, so that the number of catalyst units U to be connected is selected. Alone can handle the required processing power. Therefore, the catalyst unit U having a single configuration and the casing 11 having a length corresponding to the number of units to be accommodated may be manufactured, and the deodorizing apparatus 10 that matches the required processing capacity without increasing the manufacturing cost. It becomes possible to produce.

Furthermore, since a plurality of catalyst units U are connected in series and exchangeable, only the electrically heated metal catalyst carrier 30 to be replaced can be easily replaced together with the catalyst unit U, and waste accompanying disposal can be minimized. Can be reduced
The deodorizing apparatus 10 is excellent in cost.

Moreover, since the control device 63 controls the operation of each of the switches 62a to 62c based on the gas temperature on the outlet side of the electrically heated metal catalyst carrier 30, the deodorizing device 1
0 can reduce power consumption as a whole.

As the temperature of the electrically heated metal catalyst carrier 30 rises, thermal expansion in the axial direction occurs at the central portion 31a of the center electrode 31, and thermal expansion occurs in the radial direction at the extraction portion 31b. The axial thermal expansion of the central portion 31a
In the above, the metal foil member 32 is absorbed by being slightly displaced along the axial direction, and the radial thermal expansion of the lead portion 31b is absorbed by the sliding portion 40 being slightly displaced by the drawn portion 31b along the radial direction. . Therefore, even if thermal expansion occurs in the central electrode 31 in two directions perpendicular to each other, thermal stress does not concentrate on the electrode penetrating portion, and insulation failure and sealing failure can be prevented reliably and for a long time. In addition, there is no possibility that the metal foil member 32 will be damaged and the deodorizing function will not be reduced.

Although the case where the second case body 22 in the catalyst unit U is made of a conductive material has been described, the material of the second case body 22 is not particularly limited.
The electrical insulation between the center electrode 31 and the conductive first case body 21 in the stacked upper catalyst units U
From the viewpoint of securing electrical insulation between the heat-resistant insulating resin and the heat-resistant insulating resin. In this case, it is not necessary to provide a member for securing the insulation between the second case body 22 and the lead-out portion 31b of the center electrode 31 in the configuration of the sliding portion 40. And the function of sealing the gap between the through hole 24 and the drawer 31b may be provided.

<< Modification of Catalyst Unit U >> A modification of the catalyst unit U will be described. FIG. 6 is a sectional view showing a modification of the catalyst unit U.

In the above-described catalyst unit U, the case 20 is formed by combining the first and second case bodies 21 and 22.
In this modified example, the case for accommodating the electrically heated metal catalyst carrier 30 is composed of one metal case 70. A large diameter portion 70a to which the lower end of the stacked catalyst units U is connected is also formed on the upper part of the metal case 70, and an external electrode is integrally formed. The center electrode 71 has a center portion 71a and a lead portion 71b.
Are formed separately, and both are connected by brazing or welding 72.

[0051]

As described above, according to the first aspect of the present invention, it is easy to replace the electrically heated metal catalyst carrier, and it is possible to meet the required processing capacity without increasing the production cost. The resulting deodorizing device can be provided.

According to the second aspect of the invention, the power consumption of the entire deodorizing device can be reduced.

According to the third aspect of the present invention, it is possible to provide a deodorizing apparatus capable of reliably preventing insulation failure and sealing failure due to thermal expansion of the center electrode of the electrically heated metal catalyst carrier.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a deodorizing device according to the present invention.

FIG. 2 is a sectional view showing one catalyst unit constituting the deodorizing device.

FIG. 3 is a view showing an example of forming a catalyst carrier portion of an electrically heated metal catalyst carrier.

FIG. 4 is a plan view showing the catalyst carrier.

FIG. 5 is a cross-sectional view illustrating a configuration of a sliding portion that slidably penetrates a center electrode through a case.

FIG. 6 is a sectional view showing a modification of the catalyst unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Deodorizing device U ... Catalyst unit 20, 70 ... Case 23 ... Gas flow path 30 ... Electric heating type metal catalyst carrier 31, 71 ... Center electrode 31a, 71a ... Center part 31b, 71b ... Lead-out part 32 ... Metal foil member 33 ... catalyst carrier parts 34, 74 ... external electrodes 36 ... non-bonded parts 40 ... sliding parts 54 ... heat-resistant sealing tape 60 ... power supply part 61 ... thermocouples (temperature detecting means) 62 (62a, 62b, 62c) ... switches (current) Limiting means) 63 ... Control device (control means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G091 AB02 BA07 BA10 BA20 BA39 CA04 DA03 EA17 EA30 GA06 GA07 GA08 GA10 GA11 GA12 GA13 GB01X GB01Z HA08 HA12 HA27 HA28 HA29 HA31 HA32 HA33 HA36 HA37 HA38 HA42 HA47 3K058 CA23 CA69 GA06

Claims (3)

[Claims] 1. A deodorizing apparatus comprising an electrically heated metal catalyst carrier (30) constituted by a metal catalyst carrier coated with a catalyst substance and capable of conducting and generating heat, a gas flow passage (23) is formed. Case (20, 70)
A plurality of catalyst units (U) accommodating the electrically heated metal catalyst carrier (30) therein are connected in series and exchangeable, and the electrodes (3) of each electrically heated metal catalyst carrier (30) are connected.
1, 34) connected in parallel to a power supply section (60). 2. An electrode (3) of each of the catalyst units (U).
1, 34) a current limiting means (62) provided in a power line through which a current flows, and a position downstream of the electrically heated metal catalyst carrier (30) along a gas flow direction in each of the catalyst units (U). And a control means (6) for controlling the operation of the current limiting means (62) based on the temperature detected by the temperature detecting means (61).
The deodorizing apparatus according to claim 1, further comprising: 3). 3. The electrically heated metal catalyst carrier (30).
A central portion (31a, 71a) extending along the gas flow direction in the case (20, 70);
a, 71a) extending in a direction substantially perpendicular to the case and being drawn out of the case (20, 70).
b, 71b), and one end of a band-shaped metal foil member (32) is attached to the center portion (31a, 71a) of the center electrode (31, 71). The metal foil member (32) is attached to the central portion (31).
a, 71a) in a cylindrical shape and wound around the catalyst carrier portion (33), and an external electrode (34, 34) electrically connected to an outer peripheral portion of the cylindrical catalyst carrier portion (33). 74), and the non-joining portion (36) that does not join the wound metal foil members (32) to each other is provided near the center portion (31a, 71a) of the center electrode (31, 71). The lead-out portion (31b, 7) of the center electrode (31, 71).
The deodorizing device according to claim 1 or 2, further comprising a sliding portion (40) for slidably penetrating the case (20, 70) through the case (20, 70).