JPH0321323A - Deodorizing apparatus - Google Patents

Abstract

PURPOSE:To prevent the leakage of undecomposed malodorous gas at the time of the regeneration of an adsorbent by successively providing a first heater, thermal cracking catalyst heated by the first heater, an adsorbent and a second heater heating the adsorbent from above in a duct having an emission part provided to the upper part thereof. CONSTITUTION:A first heater 22, the noble metal type thermal cracking catalyst heated by the first heater 22, an adsorbent 24 and a second heater 25 heating the adsorbent 24 are successively provided from above in a duct 20 having an emission part 21 for emitting gas containing a malodor into the duct 20. As a result, the leakage of undecomposed malodorous gas can be prevented at the time of the regeneration of the adsorbent while the miniaturization of the catalyst and the heater heating the catalyst and the simplification of apparatus constitution are achieved and this apparatus can be arranged at an arbitrary position and can also be easily moved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a deodorizing device, and particularly to an indoor deodorizing device suitable for deodorizing contaminated air generated in the home.

(Prior Art) Various deodorizing techniques have been considered in order to purify contaminated air containing various malodorous substances generated in the home. The most commonly used deodorizing method is one in which the molecules of malodorous substances are physically adsorbed using an adsorbent such as activated carbon. However, in this method, the amount of adsorption is determined by the amount of adsorbent, so the life of the adsorbent is limited.

Therefore, as described in Japanese Patent Publication No. 59-12935, etc., the life of the adsorbent is extended by performing purification circulation using an adsorbent and an oxidation catalyst, and by intermittently regenerating the adsorbent by heating. A circulating ventilation fan with an air purification device has been proposed which has an extended length and reduces the amount of adsorbent used. This circulation ventilation fan is placed in an exhaust duct, and an adsorbent, a heater, and a gas decomposition catalyst are sequentially arranged from the upstream side of the air flow. During deodorization, the odor gas is physically adsorbed onto the adsorbent and removed. When the adsorbent is saturated with adsorption and its deodorizing efficiency decreases, the system regenerates the adsorbent by heating the adsorbent to re-release the odor gas, which is then oxidized and decomposed by the heated gas decomposition catalyst. ing.

However, with this configuration, when regenerating the adsorbent, the temperature may not be sufficient to activate the gas decomposition catalyst, or
Furthermore, if the amount of re-released odorous gas is large, there is a possibility that undecomposed odorous gas will be released from the exhaust duct.

To prevent this, it is possible to increase the size of the catalyst to match the amount of air used to treat the odor gas, but this requires a large heater and requires a lot of electricity to fully activate the catalyst. A problem arises in that it takes time.

Furthermore, in order to avoid the problem of overheating the entire deodorizing device due to heating of the catalyst, it is necessary to consider the heat insulation and heat resistance of the device. Further, catalysts are generally expensive, and increasing their size increases product costs, which is not desirable for users.

On the other hand, it is also conceivable that during regeneration, the amount of air is reduced and the catalyst is ventilated to prevent undecomposed odor gas from being released from the exhaust duct. However, since circulation ventilation fans generally deodorize indoor air and require a considerable amount of air volume during deodorization, the air volume during regeneration must be much lower than when deodorizing. It is extremely difficult to greatly change the air volume with a single fan. Therefore, there is a method to vary the air volume by installing two large and small fans and switching between them with a damper during regeneration and during deodorization, but the mechanism such as the damper becomes complicated.

For these reasons, in the example of Japanese Patent Publication No. 59-12935, the gas is released outside when the adsorbent is regenerated, but since it is necessary to make a hole in the wall, the installation position of the deodorizing device has to be changed. However, once installed, it cannot be moved to any desired position.

(Problems to be Solved by the Invention) As mentioned above, in the adsorption-thermal deodorization device that has an adsorbent regeneration function, there is a possibility that the odor gas re-released from the adsorbent during regeneration may be released without being decomposed by the catalyst. There is.

As a countermeasure to this problem, the method of increasing the size of the catalyst has problems in terms of cost and power saving. Furthermore, the method of reducing the air volume during playback requires the provision of a complicated mechanism such as a damper to switch the air volume. Furthermore, the method of releasing the gas generated during regeneration outdoors has the problem that the installation position of the deodorizing device is restricted and movement becomes difficult.

The present invention was made to solve the above-mentioned problems, and while reducing the size of the catalyst and catalyst heater and simplifying the device configuration, it also prevents undecomposed odor gas from leaking during adsorbent regeneration. To provide a deodorizing device that can be installed at any position and easily moved.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a duct from above that has a discharge part at the top for discharging odor-containing gas into the interior. The present invention is characterized in that a first heater, a thermal decomposition catalyst heated by the first heater, an adsorbent, and a second heater that heats the adsorbent are sequentially installed.

More preferably, a fan is further installed in the duct below the second heater, the fan is operated during deodorization, the first and second heaters are energized when the adsorbent is regenerated, and the fan is operated. The configuration is such that it stops.

(Operation) During deodorization, odor gas flows through the duct, is physically adsorbed by the adsorbent, and is deodorized and removed, and odorless air flows downstream of the duct. When the adsorbent approaches a saturated state and its deodorizing ability decreases, the adsorbent is regenerated by heating.

When regenerating the adsorbent, first, a second heater provided below the adsorbent below the duct is energized to heat the adsorbent. At this time, the odor gas that has been physically adsorbed on the adsorbent is released in a concentrated state, but this odor gas rises in the duct because of its high temperature.

If the upper part of the duct is almost a closed space, the thermal decomposition catalyst activated to a high temperature by the first heater placed here will oxidize and decompose the odorous gas that has risen. Therefore, undecomposed odor gas released from the adsorbent during regeneration will not leak out of the duct.

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

FIG. 1 is a sectional view of a deodorizing device according to an embodiment of the present invention,
FIG. 2 shows an example in which this device is used as a deodorizing device for a Western-style toilet bowl.

In FIG. 2, a toilet bowl 1 is provided with a rim hole 2 and a water conduit 3 through which water is discharged. The float valve 4 is pulled open by the chain 6 when the lever 5 is operated,
Water is supplied to the water pipe 3. Water supplied to the water pipe 3 flows into the toilet bowl 1 through the rim hole 2. After water is supplied to the water pipe 3, the water is stored in the tank 7 through the water supply pipe 9, and the valve 10 is closed by the buoyancy of the floating ball 8 to stop the water at an appropriate amount.

A deodorizing device 14 is connected via a ventilation pipe 13 to a connecting pipe 12 located above an overflow pipe 11 provided in the tank 7 for stopping the overflow of water. The air deodorized by the deodorizing device 14 is discharged into the room from the exhaust port 15.

Next, the configuration of the deodorizing device 14 will be explained with reference to FIG. The odor gas is passed through the ventilation pipe 13 from the hole in the tank 7 and into the duct (casing) 20 of the deodorizing device 14 through the upper gas discharge port 2.
Imported from 1. A first heater 22 is provided in the upper part of the duct 20, that is, near the discharge port 21, and further, a noble metal-based thermal decomposition catalyst 23 heated by the heater 22 is provided adjacent to the lower part of the heater 22.

An adsorbent 24 for adsorbing odor is provided in the duct 20 below the thermal decomposition catalyst 23 , and a second heater 25 for heating the adsorbent 24 is provided below the adsorbent 24 . is located close to. A turbo fan 26 and a motor 27 for driving the turbo fan 26 are installed below the heater 25. Further, an exhaust port 15 is formed at the bottom of the duct 20.

A heat insulating layer 28 made of rock wool is provided on the inner wall of the duct 20 to protect the duct 20 from the heat generated by the heaters 22 and 25. On this heat insulating layer 28, two heat ray reflecting plates made of aluminum foil, for example, are provided. It is provided.

Next, the operation of the deodorizing device of this embodiment will be explained.

During deodorization During deodorization, odor gas sucked from the rim hole 2 of the toilet bowl 1 through the water conduit 3 passes through the overflow pipe 11, the connecting pipe 12, and the ventilation pipe 13, and passes through the duct 2 of the deodorizing device 14.
0 through the discharge port 21. Duct 20
The odor gas introduced into the chamber is adsorbed by the adsorbent 24 as shown by the self-arrow, and is further sucked by the turbo fan 26 to be made odorless. The deodorized air is discharged from the exhaust port 15.

For example, when a person sits on toilet bowl 1, the air volume of odor gas is
0.3 m that prevents odor from flowing back from toilet bowl 1 and being released into the outside air
'/sin, and 200 g of activated carbon is used as the adsorbent 24 to prevent odor from leaking to the outlet side when this amount of odor gas is ventilated. With this amount of activated carbon, assuming a family of four operates three times/day for 5 minutes each.
After about a week, the potency decreases and an odor begins to leak from the outlet. At this time, it becomes necessary to regenerate the adsorbent 24 as follows.

When regenerating the adsorbent 24 during regeneration, first the turbo fan 26 is stopped and the duct 20 is brought into a substantially closed state. Then, the heater 25 is energized to heat the adsorbent 24. The heating temperature is set to 80° C. and is initially increased at a rate of 20° C./fflin, and after reaching 80° C., it is heated for 15 minutes and then cooled.

Odor gas released from the adsorbent 24 during heating rises as shown by the black arrow in FIG. 2 due to its high temperature, and is decomposed by the thermal decomposition catalyst 23 located at the top.

The pyrolysis catalyst 23 is heated before the adsorbent 24 is heated.
It is heated to the activation temperature by the heater 22.

Therefore, the conventional problem of undecomposed odor gas released from the adsorbent 24 leaking out of the duct 20 when the adsorbent 24 is regenerated is avoided. Further, in this case, there is no need to switch the air volume using a damper or the like.

The thermal decomposition catalyst 23 is made of platinum. This platinum-based catalyst is made of thin plate-like silica alumina and weighs about 1 g. The heater 22 heats the thermal decomposition catalyst 23 at about 80°C/Ilin, and the steady temperature is 280°C.

During this heating, the duct 20 is protected by a heat insulating layer 28 and two heat ray reflecting plates, and the outer wall temperature is maintained at 70° C. or less even after heating for 15 minutes. After the regeneration of the adsorbent 24 is completed, the power supply to the heater 22 is stopped to cool the duct 20, and after the duct 20 is almost cooled, the deodorizing function is restarted.

According to the conventional technology, when regenerating the adsorbent with an air flow rate of 0.3 m'/ml, the Sv value of the thermal decomposition catalyst is generally reduced to 1.
0000h-', I. As many as 81 large catalysts are required. Therefore, it is extremely difficult to use it as a household deodorizing device due to the installation space and cost of the catalyst, as well as the ability and power consumption of the heater that heats the catalyst. Furthermore, if the air volume during regeneration is reduced to 1/10, the amount of catalyst can be reduced to 180 sN, but it is extremely difficult to vary the air volume in this way with a single fan.

On the other hand, in the present invention, during regeneration, the turbo fan 26 is stopped and the air flow utilizes the rising air current generated when the adsorbent 24 is heated, so that the air volume is slightly adjusted. Therefore, since the fan is used only for deodorizing, it is only necessary to produce one type of air volume, and there is no need to vary the air volume using a damper or the like. Further, since the released gas remains in the upper space of the duct 20 and does not escape, the catalyst 23 does not need to cover the entire cross section of the duct 20 and may be small in terms of cost.

Therefore, the heater 22 that heats the catalyst 23 can be made smaller and require less power to be input. Further, the shape of the catalyst 23 does not necessarily have to be a honeycomb shape, and may be a plate shape, so that the cost can be reduced.

In addition, in this embodiment, since the path from the rim hole 2 through which the odor gas is sucked to the odor gas discharge section 21 of the deodorizing device 14 is relatively long, the odor gas does not flow backward during regeneration.

However, if this bath is short, there is a risk that the odor gas will flow back during regeneration, so it is desirable to add a damper to block the discharge portion in order to close the deodorizing device 14 during regeneration.

FIG. 3 shows the main part of this embodiment, in which a damper 31 is provided in the odor gas discharge section 21. The damper 31 has one end supported by a hinge spring 32, and
The other end is pulled by a shape memory alloy spring 33, and the opening and closing are performed by the balance of these springs 32 and 33. In other words, when deodorizing, the hinge spring 3
2, the damper 31 opens, and when the temperature during regeneration becomes high, the redamper 31 closes due to the force of the shape memory alloy spring 33.

Note that it is not necessary to use the shape memory alloy spring 33 as described above, and a damper that opens by the wind pressure of the turbo fan 26 shown in FIG. 2 may be provided. Alternatively, a structure may be adopted in which the damper is opened and closed using a bimetal.

The present invention is not limited to the embodiments described above, and can be implemented with various modifications as follows.

For example, activated carbon was used as the adsorbent in the examples, but other adsorbents may be used as long as they can be decomposed by heating.

In the examples, a noble metal catalyst was used, but any thermal decomposition catalyst that can be decomposed by heating may be used.

In the example, rock wool was used as the heat insulating layer 28, but
This may be any non-flammable or flame-retardant heat insulating layer, and for example, glass wool or powder may be used.

In the example, aluminum foil was used as the heat ray reflecting plate 29, but
Any material may be used as long as it has a metallic glossy surface that reflects heat rays, such as a metal oxide film or a metal film.

In the example, a toilet bowl was exemplified as an object to be deodorized, but
Any device may be used as long as it can be deodorized by ventilation, and it can be applied to refrigerators, etc., for example.

[Effects of the Invention] According to the deodorizing device of the present invention, the following effects can be obtained.

(1) A simple structure that does not require a damper for varying air volume can prevent leakage of undecomposed odor gas that is re-released during regeneration.

(2) Since the pyrolysis catalyst can be made smaller, the cost is lower and less power is required to heat the catalyst, and the amount of heat generated is accordingly reduced, reducing the impact on the duct (casing). It becomes possible to do so.

(3) Since the exhaust gas does not contain odor gas, there is no need to release the exhaust gas outdoors.Therefore, there is no need to install an exhaust duct, which increases the flexibility of the installation location and makes the device portable. can do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a deodorizing device according to an embodiment of the present invention, FIG. 2 is a diagram showing an example in which the deodorizing device of the same embodiment is applied to a toilet bowl, and FIG. FIG. 3 is a cross-sectional view showing the main parts of the embodiment. 1... Toilet bowl, 2... Rim hole, 3... Water pipe, 4...
...Float valve, 5...Lever 6...Chain, 7
... Tank, 8 ... Floating ball, 9 ... Water supply pipe, 10
... Valve, 11 ... Overflow pipe, 12 ... Connecting pipe, 13 ... Ventilation pipe, 14 ... Deodorizing device, 15.
...Exhaust port, 20...Duct, 21...Odor gas discharge port, 22...First heater, 23...Pyrolysis catalyst, 24...Adsorbent, 25...・Second heater,
26...Turbo fan, 27...Motor, 28...
・Insulation layer, 2...Heat ray reflection line, 31...Damba,
32... Hinge spring, 33... Shape memory alloy spring.

Claims (2)

[Claims] (1) A first heater, a pyrolysis catalyst heated by the first heater, an adsorbent, and the adsorbent are placed in a duct having a discharge part at the top for discharging odor-containing gas inside. A deodorizing device characterized by sequentially installing second heaters that heat the agent. (2) A first heater, a pyrolysis catalyst heated by the first heater, an adsorbent, and the adsorbent are placed in a duct having a discharge part at the top for discharging odor-containing gas inside. A second heater and a fan are installed to heat the
A deodorizing device characterized in that the fan is operated during deodorization, and the first and second heaters are energized and the fan is stopped when the adsorbent is regenerated.