JP2003254054A - Drain water reformer of engine drive type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reform a drain water to be neutralized or to be alkalified by disposing a metal member dissolving Mg<SP>2+</SP>ions into the drain water, and to reduce a size of a drain water reformer. <P>SOLUTION: This drain water reformer of the engine drive type air conditioner comprises: a refrigeration circuit 10 including a compressor 11 driven by an engine 20, an exterior heat exchanger 12, an expansion valve 13, and an interior heat exchanger 14; an exhaust system 30 discharging an exhaust gas of the engine 20; and the drain water reformer 40 for reforming the drain water generated in the exhaust system 30 to be neutralized or to be alkalified thereby discharging it. The drain water reformer 40 includes: a reforming vessel; and first and second electrodes 42 and 43 made of magnesium, and applies voltage to the electrodes 42 and 43 to dissolve Mg<SP>2+</SP>ions into the drain water from the electrodes 42 and 43, thereby reforming the drain water to be neutralized or to be alkalified. Accordingly, the drain water reformer 40 is reduced in size. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven air conditioner, and more particularly to a drain for reforming drain water generated in an exhaust system that exhausts exhaust gas of an engine used in this type of air conditioner. It relates to a water reformer.

[0002]

2. Description of the Related Art Conventionally, as a drain water reformer for an engine-driven air conditioner of this type, for example, Japanese Unexamined Patent Publication No. 2000-21 is used.
The one described in Japanese Patent No. 3341 is disclosed. In this publication, a drain water reformer configured to neutralize and discharge drain water, which is generally acidic water generated in an exhaust system that exhausts exhaust gas of an engine, before being discharged to the atmosphere.

This drain water reformer is provided with a drain inlet communicating with the exhaust system, a drain outlet communicating with the atmosphere, and a drain flow path formed between the drain inlet and the drain outlet and meandering vertically. . Then, the drain water in the drain passage generates an opposing pressure that opposes the exhaust gas pressure received at the drain inlet. As a result, the exhaust gas entering the drain water reformer is pushed back by the opposing pressure and cannot reach the drain outlet.

Further, the meandering drain passage is covered with calcium carbonate as a neutralizing agent, and the drain water is brought into contact with the calcium carbonate to neutralize the acidic drain water, and then externally. It is designed to be discharged to.

[0005]

However, in the drain water reformer having the above-described structure, the exhaust gas is difficult to be discharged to the drain outlet because the drain water reformer cannot reach the drain outlet due to being pushed back by the opposing pressure. However, in addition to these, it is necessary to increase the filling frequency of the neutralizing agent as much as possible and to increase the contact time between the drain water and the neutralizing agent. For this reason, it is desired to make the drain passage as long as possible, but if the drain passage is made longer, there is a problem that the drain water reformer generally becomes large.

Therefore, an object of the present invention is to solve the above-mentioned problems, and by disposing a metal member for dissolving Mg ²⁺ ions in drain water, the drain water is neutralized or modified to be alkaline. At the same time, the present invention provides a drain water reformer for an engine-driven air conditioner that enables downsizing of the drain water reformer.

[0007]

In order to achieve the above object, the technical means described in claims 1 to 5 is adopted. That is, in the invention described in claim 1, the compressor (11) driven by the engine (20), the outdoor heat exchanger (12), the expansion valve (13), and the indoor heat exchanger (1).
A refrigeration circuit (10) in which 4) is connected by a refrigerant pipe, and an exhaust system (30) for exhausting exhaust gas of the engine (20)
And a drain water reformer (4) for reforming drain water generated in the exhaust system (30) to neutral or alkaline and discharging it.
0), a drain water reformer for an engine-driven air conditioner, wherein the drain water reformer (40) comprises a reforming tank (41) for circulating drain water and a plurality of metal members made of magnesium material. (42, 43, 44), and the drain water in the reforming tank (41) is neutral or alkaline by dissolving Mg ²⁺ ions in the drain water from a plurality of metal members (42, 43, 44). It is characterized in that it is configured to be modified to.

According to the invention of claim 1, the engine (2
When the exhaust gas exhausted from (0) is cooled by the exhaust system (30), the vapor of the acidic component or the vapor of the oil component due to NOx or SOx in the exhaust gas is condensed and the PH containing the oil component is condensed.
It becomes an acidic drain water of about 3. When the metal members (42, 43, 44) made of a magnesium material are immersed in the drain water, Mg ²⁺ ions are dissolved from the metal members (42, 43, 44) into the drain water.

[0009] Mg ²⁺ ions to drain water dissolved, 3 reacts with HNO ₃ and H ₂ SO ₄ contained in the reaction the Mg ²⁺ ions and OH- to Mg (OH) ₂ and drain water
Since Mg (NO ₃ ) ₂ and MgSO ₄ are produced and mixed with the drain water, the acidic drain water is modified to be neutral or alkaline.

Further, since the metal members (42, 43, 44) are consumed by dissolving the Mg ²⁺ ions, it is necessary to regularly replace the metal members (42, 43, 44). However, the frequency of maintenance can be reduced as compared with the conventional method in which the neutralizing agent (calcium carbonate) is filled and dissolved.

Further, this magnesium material has an active dissolution property in the acidic to neutral range, but is stable in the alkaline range because it forms an immovable body, so that the dissolution does not proceed in this range. Therefore, the metal members (42, 43, 44) are not consumed when immersed in the alkaline-modified drain water.

Further, when Mg ²⁺ ions are dissolved, magnesium, which is one of the minerals contained in the water supply, is also dissolved, so that it can be discharged directly into the sewer,
Moreover, there is no concern about pollution to the environment.

In the invention according to claim 2, the metal member (4
2, 43, 44) include at least one set of electrodes (42, 4, 4).
3, 44) and the drain water reformer (40) dissolves Mg ²⁺ ions in the reforming tank (41) by applying a voltage between the electrodes (42, 43, 44). It is characterized by reforming drain water to neutral or alkaline.

According to the invention of claim 2, the electrode (4
2, 43, 44) by applying a voltage between them to dissolve Mg ²⁺ ions and modify the drain water to be neutral or alkaline.
Comparing the decomposition ability of NO ₃ with the conventional method in which a neutralizer is filled and dissolved, the amount of decomposed nitric acid per the same weight is about four times higher in electrolysis that dissolves Mg ²⁺ ions. Moreover, since the decomposition rate is high, the drain water reformer can be made compact and lightweight.

According to the third aspect of the present invention, the drain water reformer (40) firstly applies a positive voltage to one of the electrodes (42, 43, 44) and a negative voltage to the other. A positive electrode has a voltage applying means (45) for alternately switching between an energization mode and a second energization mode in which a negative voltage is applied to one of the electrodes (42, 43, 44) and a positive voltage is applied to the other. It is characterized in that the drain water is reformed to neutral or alkaline by dissolving Mg ²⁺ ions in the reforming tank (41) from the electrodes (42, 43, 44) to which the voltage is applied.

According to the third aspect of the present invention, the electrodes (42, 43, 44) are consumed by the dissolution of the Mg ²⁺ ions from the positive electrodes (42, 43, 44). By having the voltage applying means (45) for switching, both electrodes (42, 43, 44) are consumed evenly, so that the maintenance period can be extended.

In the invention according to claim 4, the exhaust system (3
0) is an exhaust member (32, 33) made of stainless steel
And a plurality of metal members (42, 43, 4
4) is electrically connected to the exhaust member (32, 33), and the drain water reformer (40) includes a plurality of metal members (42, 43,
44) generates a standard electrode potential difference between the exhaust member (32, 33) and dissolves Mg ²⁺ ions in the drain water from the plurality of metal members (42, 43, 44) to reform the reforming tank (41).
It is characterized in that the drain water inside is modified to be neutral or alkaline.

According to the invention described in claim 4, the standard electrode potential difference between the metals of the magnesium material and the stainless material is about 2.0V. If the magnesium material is used as a sacrificial electrode made of stainless steel by applying this standard electrode potential difference, the magnesium material is dissolved.

Therefore, according to the present invention, the metal members (42, 4
3, 44) can be electrically connected to the exhaust member (32, 33) to prevent corrosion of the stainless steel material, and the metal member (42, 43, 44) converts the drain water into Mg.
²⁺ ions can be dissolved.

In the invention according to claim 5, the metal member (4
2, 43, 44) and the exhaust member (32, 33) are electrically connected to each other by an opening / closing means (46) for opening and closing the metal member (4).
2, 43, 44) and the exhaust member (32, 33) provided between the drain water reformer (40) and the engine (20).
It is characterized in that the opening / closing means (46) is brought into conduction when the is operating.

According to the fifth aspect of the present invention, there is provided the opening / closing means (46) for opening / closing the electrical connection between the metal member (42, 43, 44) and the exhaust member (32, 33), When the (20) is operating, the opening / closing means (4
By making 6) conductive, the drain water generated from the engine (20) in operation can be easily reformed, and a drain water reformer having a simpler structure than the electrolysis system can be provided.

The reference numerals in the parentheses of the above means indicate the correspondence with the specific means of the embodiments described later.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is applied to an engine-driven air conditioner will be described below with reference to FIGS. First of all,
It is a schematic diagram which shows the whole structure of the drain water reformer of the engine drive type air conditioner in 1st Embodiment of this invention.

In FIG. 1, an engine-driven air conditioner 100 includes a compressor 11, an outdoor heat exchanger 12, and an expansion valve 1.
3, a refrigerant circuit 10 formed by connecting an indoor heat exchanger 14 with a refrigerant pipe 15, and an engine 2 for driving a compressor 11.
0 and an exhaust system 3 that exhausts exhaust gas from the engine 20
0 and a drain water reformer 40 that reforms and discharges drain water generated in the exhaust system 30. In addition, this refrigerant pipe 15 is the refrigerant pipes 15a and 15a in this embodiment.
b, 15c, 15d, 15e, 15f.

The compressor 11 is connected to the four-way switching valve 16 via a refrigerant pipe 15a. The four-way switching valve 16 is connected to the refrigerant pipes 15b, 15e, and 15f in addition to the refrigerant pipe 15a, and depending on whether the cooling operation or the heating operation is performed, 15a
-15b and 15e-15f connection (cooling operation),
It is possible to switch to one of the connections (heating operation) of 15a-15e and 15b-15f.

The refrigerant pipe 15b, one end of which is connected to the four-way switching valve 16, is connected to the outdoor heat exchanger 12 at the other end. The outdoor heat exchanger 12 is further connected to the expansion valve 13 via the refrigerant pipe 15c, the expansion valve 13 is connected to the indoor heat exchanger 14 via the refrigerant pipe 15d, and the indoor heat exchanger 14 is connected to the refrigerant pipe 15e.
Is connected to the four-way switching valve 16. The refrigerant pipe 15f having one end connected to the four-way switching valve 16 has the other end connected to the compressor 11 via an accumulator (not shown).

In the above structure, when the compressor 20 is driven by the engine 20, the refrigerant in the refrigerant pipe 15 circulates in the refrigerant circuit 10. In FIG. 1, solid arrows indicate the circulation direction of the refrigerant during the cooling operation, and dotted arrows indicate the circulation direction of the refrigerant during the heating operation. Hereinafter, the cooling operation will be described by taking cooling as an example. In this case, the four-way switching valve 16 includes the refrigerant pipes 15a-15b and the refrigerant pipe 15e.
-15f are connected respectively.

The high-pressure gaseous refrigerant that has been pressurized by the compressor 11 and discharged is the refrigerant pipe 15a and the four-way switching valve 1.
6. It is introduced into the outdoor heat exchanger 12 through the refrigerant pipe 15b. In the outdoor heat exchanger 12, the high pressure gas refrigerant is the outdoor fan 1
The heat is released to the outside by 2a, and the enthalpy of itself is lowered to become a gas-liquid two-phase refrigerant. The refrigerant having the gas-liquid two phases thus passes through the refrigerant pipe 15c and the expansion valve 13, where it is expanded and reduced in pressure. Further, the low-pressure refrigerant is the refrigerant pipe 15
It is introduced into the indoor heat exchanger 14 through d.

In the indoor heat exchanger 14, the low-pressure refrigerant absorbs heat from the outside by the indoor fan 14a, raises its own enthalpy and is partially vaporized. The atmosphere is cooled by the latent heat of vaporization that accompanies this vaporization, and cooling is performed. Indoor heat exchanger 14
The partially vaporized refrigerant is gas-liquid separated by an accumulator (not shown) through the refrigerant pipe 15e, the four-way switching valve 16 and the refrigerant pipe 15f, and only the gas-phase refrigerant is re-compressed.
Return to. In this way, the cooling operation is performed.

A cooling water circuit 50 is provided in the engine 20. A part of the cooling water circuit 50 passes through the engine 20 to cool the engine 20, and a circulation pump 51 circulates the cooling water in the circuit. Further, the cooling water circuit 50 cools the cooling water heated by heat exchange with the engine 20 with a heat exchanger 52 interposed therebetween. Further, an exhaust heat exchanger 32, which will be described later, is also interposed in the cooling water circuit 50, and the engine 2
It also exchanges heat with the exhaust gas from 0 to reduce the exhaust gas temperature.

The exhaust system 30 includes an exhaust pipe 31 connected to the engine 20, the above-mentioned exhaust heat exchanger 32 arranged in the middle of the exhaust pipe 31, and a downstream end side of the exhaust pipe 31 (engine 20).
The exhaust muffler 33 is mounted on the side away from the exhaust muffler 33. The exhaust pipe 31 communicates with the combustion chamber of the engine 20 and is a pipe for releasing the exhaust gas after being burned in the combustion chamber to the atmosphere. Exhaust heat exchanger 32
As described above, the heat exchange is performed between the high temperature exhaust gas passing through the exhaust pipe 31 and the engine cooling water to lower the exhaust gas temperature. The exhaust muffler 33 enlarges a passage cross section of exhaust gas to reduce exhaust noise.

Exhaust heat exchanger 32 and exhaust muffler 33
An end of an inlet side drain hose 61 is connected to the. The drain water reformer 40 is connected to the other end of the inlet-side drain hose 61. Further drain water reformer 40
One end of an outlet side drain hose 62 is connected to this, and the other end of this outlet side drain hose 62 is open to the atmosphere.

The drain water discharged to the inlet side drain hose 61 is the exhaust heat exchanger 32 and the exhaust muffler 3.
When the exhaust gas is cooled in 3, the NOx and S in the exhaust gas
The vapor of the acidic component or the vapor of the oil component due to Ox is condensed to become acidic drain water of PH3 containing the oil component.

Next, the construction of the drain water reformer 40, which is the main part of the present invention, will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the drain water reformer 40 includes a reforming tank 41 that conducts drain water, and first and second electrodes 42 and 43 that are arranged to face each other in the reforming tank 41. The reforming controller 47 is composed of a voltage applying circuit section 45 which is a voltage applying means for applying a voltage to the first and second electrodes 42 and 43.

Moreover, the inlet portion 4 provided in the reforming tank 41
1a is connected to the inlet side drain hose 61 of the exhaust system 30 to take in drain water, and the outlet part 41b provided in the reforming tank 41 is connected to the outlet side drain hose 62 for drainage. The outlet part 41b is provided so that when drain water introduced from the inlet side drain hose 61 is added, it is discharged to the atmosphere by overflow.

Here, since the drain water introduced from the inlet side drain hose 61 mainly contains acidic (about PH3) corrosive components such as nitrogen oxides in the exhaust gas, the reforming tank The material of 41 is formed of a resin material such as a plastic resistant to acid and alkali or a metal material having corrosion resistance, and guides drain water from the inlet side drain hose 61 to neutralize or modify the drain water. It is a container and is installed downstream from the inlet-side drain hose 61.

The first and second electrodes 42 and 43 arranged to face each other in the reforming tank 41 are plate-like metal members made of magnesium material.

Next, as shown in FIG. 3, the voltage application circuit section 45, which is a voltage application means, applies a positive voltage (+ Vo) to the first electrode 42 and a negative voltage (-Vo) to the second electrode 43. )
And a first electrode 42 for applying a first energization mode (t seconds)
The second energizing mode (t seconds) in which a negative voltage (-Vo) is applied to the second electrode 43 and a positive voltage (+ Vo) is applied to the second electrode 43 is energized so that the polarity is alternately switched. The first,
The voltage applied to the second electrodes 42 and 43 is adjusted by the reforming controller 47 so that the current flowing in the reforming tank 41 has a predetermined value.

Further, the reforming controller 47 receives the operation signal of the engine 20 output from the air conditioning controller (not shown) for controlling the engine-driven air conditioner 100, whereby the drain water reformer is supplied. 40 is operated.
In the present embodiment, after the engine 20 has been operated, the first and second electrodes 42 and 43 are energized after a predetermined time has elapsed, and after the engine 20 has stopped a predetermined time, the first and second electrodes 4 are
Control is performed so that the power supply to Nos. 2 and 43 is stopped.

Next, the drain water reformer 4 having the above structure
The operation of 0 will be described. First, when the engine-driven air conditioner 100 is operated, an operation start signal of the engine 20 is input to the reforming controller 45 from an air conditioning controller (not shown). Then, after the reforming controller 45 receives the operation start signal, the voltage applying circuit unit 45 is energized and a voltage is applied between the electrodes 42 and 43 after a predetermined time elapses. An electric current flows through the drain water, and the drain water introduced is electrolyzed as shown below.

Incidentally, the polarity of the voltage applied between the electrodes 42 and 43 is switched so as to be inverted from the high potential side to the low potential side every predetermined time (t seconds). The electrode 42 has a polarity on the high potential side, and the second electrode 4
A chemical formula in which Mg ²⁺ ions are dissolved from the electrode on the high potential side by electrolysis when 3 has the polarity on the low potential side will be described with reference to FIG.

[0042] Mg ²⁺ ions from the high potential side electrode 42 is dissolved, Mg ²⁺ as indicated by the following chemical formula (1)
Ions react with OH- to produce Mg (OH) ₂ ,
Furthermore, as shown in chemical formulas (2) to (5), HNO ₃ and H ₂ SO ₄ contained in drain water react with Mg and Mg (OH) ₂ respectively, and 3Mg (NO ₃ )
A water-soluble substance such as ₂ and MgSO ₄ is generated and mixed with the drain water, so that the acidic drain water in the reforming tank 41 is reformed to be neutral or alkaline.

[0043]

Embedded image Mg ²⁺ + 2OH- → Mg (OH) ₂

[0044]

Embedded image 3Mg + 8HNO ₃ → 3Mg (NO ₃ ) ₂ +
2NO + 4H ₂ O

[0045]

Embedded image Mg + H ₂ SO ₄ → MgSO ₄ + H ₂

[0046]

Embedded image Mg (OH) ₂ + 2HNO ₃ → Mg (N
O ₃ ) ₂ + 2H ₂ O

[0047]

Embedded image Mg (OH) ₂ + 2H ₂ SO ₄ → MgSO ₄ +
2H ₂ O In addition, one of the electrodes 43 on the low potential side has hydrogen ions of 2H
There is a reaction in which ⁺ receives electrons and becomes hydrogen gas H ₂ . The hydrogen gas H ₂ generated on the low potential side is released to the atmosphere. When the polarities of the electrodes 42 and 43 are reversed, a reaction occurs in which hydrogen ions 2H ⁺ receive an electron and become hydrogen gas H ₂ at the electrode 42, and the reactions shown by the chemical formulas (1) to (5) occur at the electrode 43. Since it will occur, the description is omitted.

Further, Mg ²⁺ ions are dissolved from the electrode on the high potential side, and magnesium in the electrode is consumed. In the present embodiment, by alternately switching between the first energization mode and the second energization mode to energize, both electrodes 42 and 43 are alternately melted and consumed evenly.

Next, when the engine 20 is stopped, a stop signal for the engine 20 is input to the reforming controller 45 from an air conditioning controller (not shown). Then, the reforming controller 45 receives the stop signal, and after a predetermined time has elapsed, the voltage applying circuit unit 45.
The drain water reformer 40 by stopping the power supply to the drain
Electrolysis stops.

By the way, when the engine 20 is stopped, the reformed drain water in the reforming tank 41 has a constant water level and is always in contact with both electrodes 42 and 43. The material has an active property (solubility) in the acidic to neutral range, but an unmoving body is generated in the neutral to alkaline range, so that the dissolution does not proceed in this range.

The drain water reformer 40 of the first embodiment described above
According to the first formed over magnesium reforming chamber 41, that was arranged to face the second electrodes 42 and 43 perform the electrolysis, Mg ²⁺ from the high potential side of the electrodes 42 and 43 Dissolves ions and reacts with OH- to react with Mg (OH) ₂ and HNO ₃ and H ₂ SO ₄ contained in wastewater, and reacts with 3Mg (N
O ₃ ) ₂ and MgSO ₄ are generated and mixed in the waste water, so that the acidic drain water in the reforming tank 41 can be reformed to be neutral or alkaline. Further, comparing the decomposing ability of nitric acid HNO ₃ by the electrolysis reaction using the first and second electrodes 42 and 43 formed of magnesium with a conventional method in which a neutralizing agent (calcium carbonate) is filled and dissolved,
The amount of nitric acid decomposed per unit weight is about 4 for Mg ²⁺ ion.
Drain water reformer 4 due to double the number and faster decomposition rate
0 size and weight reduction can be achieved.

Further, since the Mg ²⁺ ions are dissolved, the first and second electrodes 42 and 43 are consumed.
The electrodes 42 and 43 need to be regularly replaced for maintenance, but the maintenance can be performed less frequently than the conventional method in which the neutralizing agent (calcium carbonate) is filled and dissolved. Further, by the reforming controller 47 and the voltage application circuit unit 45,
By alternately switching the polarities of the second electrodes 42 and 43 and energizing them, the consumption of magnesium is reduced.
Also, it is consumed in the same way, and the replacement period can be extended.

Further, when Mg ²⁺ ions are dissolved, magnesium, which is one of the minerals contained in the water supply, is dissolved, so that it can be discharged directly into the sewer,
Moreover, there is no concern about pollution to the environment.

Although magnesium has an active property in the acidic to neutral range, it is stable in the alkaline range because it forms an immovable body, so that dissolution does not proceed in this range. Therefore, the electrodes 42 and 43 are not consumed when immersed in the alkaline-modified drain water.

(Second Embodiment) In the first embodiment described above, the drain water reformer 40 in which the first and second electrodes 42 and 43 made of magnesium are arranged in the reforming tank 41 will be described. However, not limited to this, the first and second electrodes 42,
An intermediate electrode made of magnesium may be provided between the electrodes 43.

In this embodiment, as shown in FIG. 4, one intermediate electrode 44 is arranged between the first and second electrodes 42 and 43, and the first and second electrodes are provided between the respective electrodes. Electrode 4
The potential difference of about half of the potential difference between 2 and 43 occurs,
Mg ²⁺ ions are dissolved from the respective electrodes to neutralize or modify the drain water to be alkaline.

As a result, the electrode consumption is increased by one compared with the first embodiment, and the replacement period can be further extended. In addition, the processing time for reforming the drain water can be shortened and the drain water reformer 40 can be downsized.

Furthermore, the number of intermediate electrodes 44 may be further increased. In the present embodiment, as shown in FIG. 5, a plurality of intermediate electrodes 44 made of magnesium are arranged between the first and second electrodes 42 and 43, and the first and second electrodes are arranged.
Noble metal (Pt etc.) or noble metal alloy (P
t-Ti, etc.). According to this
Mg ²⁺ ions are dissolved from the intermediate electrode 44 made of magnesium to neutralize or modify the drain water to be alkaline.

As a result, the total area of the magnesium electrode 44 can be widened, and the drain water can be neutralized or reformed to alkaline in a short time even in the reforming tank 41 having a small volume. Further, since the first and second electrodes 42 and 43 formed of Pt-Ti alloy or the like are hardly consumed, it is preferable to perform only periodic maintenance using only the intermediate electrode 44 formed of magnesium material as a replacement part. Therefore, the first and second electrodes 4
Since there is no need to replace 2, 43, the replacement cost can be reduced. Moreover, if the intermediate electrodes 44 are integrally coupled via the electrically insulating spacers (not shown), the workability during replacement is simplified and the workability during maintenance is improved.

(Third Embodiment) In the above embodiments, the electrodes 42, 43, and 44 made of magnesium material are used to perform electrolysis in the reforming tank 41 into which drain water is introduced so that the drain water is converted into Mg ^{2 Although +} ions are dissolved, the present invention is not limited to this, and a standard electrode potential difference between metals may be applied. This standard electrode potential difference is a potential difference between metals when different kinds of metals are electrically connected. For example, between stainless and magnesium, the magnesium side serves as a sacrificial electrode and the standard electrode potential difference is about 2.0V. Electrode potential difference occurs.
This promotes dissolution (corrosion) on the magnesium side.

Therefore, the drain water reformer 40 of this embodiment is used.
As shown in FIG. 6, is the exhaust heat exchanger 3 which is an exhaust member.
2 is made of stainless steel, a plurality of plate-shaped metal members 42 made of magnesium are arranged in the reforming tank 41, and one end of each is electrically connected to the exhaust heat exchanger 32. is there.

An open / close switch, which is an open / close means for opening / closing the electrical connection between the respective metal members 42 and the exhaust heat exchanger 32, is provided during the electrical connection. Further, the opening / closing switch 46 is used for the reforming controller 47.
It is controlled by. Incidentally, it is controlled so that the opening / closing switch 46 is made conductive after a lapse of a predetermined time after the operation of the engine 20 and is opened after the lapse of a predetermined time after the engine 20 is stopped.

By the way, the engine 20 operates and the exhaust system 3
When the drain water generated at 0 is introduced into the reforming tank 41, the opening / closing switch 46 is in conduction, so that the metal member 4
A standard electrode potential difference is generated between 2 and the exhaust heat exchanger 32. As a result, Mg ²⁺ ions are dissolved in the drain water from the metal member 42 on the magnesium side. Therefore, Mg
By dissolving the ²⁺ ions in the drain water, the drain water can be modified to be neutral or alkaline as in the first and second embodiments.

According to the drain water reformer 40 of the above-described embodiment, the metal electrode 42 made of magnesium is electrically connected to the exhaust heat exchanger 32 made of stainless steel by applying the standard electrode potential difference between different metals. By doing so, it is possible to prevent corrosion of the exhaust heat exchanger 32 on the stainless steel side, dissolve Mg ²⁺ ions in the drain water from the metal member 42, and modify the drain water to be neutral or alkaline.

Further, the method applying the standard electrode potential difference can provide the drain water reformer 40 having a simpler structure than the method of performing electrolysis.

In the present embodiment, the exhaust heat exchanger 32
However, the present invention is not limited to this, and, for example, the exhaust muffler 33 and other components constituting the engine-driven air conditioner may be made of stainless material and electrically connected to the metal member 42. .

(Other Embodiments) In the above embodiments, the metal members 42, 43, 44 made of magnesium are electrolyzed and the standard electrode potential difference is applied to convert the metal members 42, 43, 44 into drain water to Mg. ^{Although 2+} ions are dissolved, the magnesium material may be immersed in acidic drain water.

Specifically, as shown in FIG. 7, a plurality of metal members 42 made of magnesium are arranged in the reforming tank 41. This is one in which the metal member 42 is immersed in acidic drain water, and the metal member 42 itself is oxidized (corroded) to form Mg (OH) ₂ as an oxide film, and this Mg (OH) ₂ Easily dissolves in acidic drain water, so that the drain water can be modified to be neutral or alkaline.

According to this, the wear of the metal member 42 is reduced as compared with the above embodiment, the replacement period for maintenance can be extended, the number of parts is small, and the structure is simple. Cost reduction can be achieved.

Further, in the first and second embodiments described above, the operation start signal and the stop signal of the engine 20 from the air conditioning controller (not shown) of the engine driven air conditioner are input to the reforming controller 45. The drain water reformer 40 is controlled to operate and stop, but not limited to this, for example, a pH sensor is provided in the reforming tank 41 to detect the pH value of the drain water, and based on the detected value, It is also possible to operate and stop the drain water reformer 40. As a result, the engine 20
The acidic drain water can be reformed with higher accuracy than the control in which the drain water is operated after a lapse of a predetermined time after the operation or stopped after a predetermined time after the engine 20 is stopped.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an engine-driven air conditioner according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 according to the first embodiment of the present invention.

FIG. 3 is a voltage application circuit 4 according to the first embodiment of the present invention.
It is explanatory drawing which shows the switching of the polarity of 5.

FIG. 4 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 according to a second embodiment of the present invention.

FIG. 5 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 according to a second embodiment of the present invention.

FIG. 6 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 according to a third embodiment of the present invention.

FIG. 7 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in another embodiment.

[Explanation of symbols]

11 ... Compressor 12 ... Outdoor heat exchanger 13 ... Expansion valve 14 ... Indoor heat exchanger 20 ... engine 30 ... Exhaust system 32 ... Exhaust heat exchanger (exhaust member) 33 ... Exhaust muffler (exhaust member) 40 ... Drain water reformer 41 ... Reforming tank 42 ... First electrode, metal member (metal member, electrode) 43 ... Second electrode (metal member, electrode) 44 ... Intermediate electrode (metal member, electrode) 45 ... Voltage application circuit (voltage application means) 46 ... Open / close switch (open / close means)

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3G004 AA06 BA06 DA23 DA25 EA01                       FA04                 4D061 DA08 DB09 EA02 EB01 EB05                       EB14 EB18 EB20 EB31 EB39                       GC12 GC16

Claims (5)

[Claims] 1. A refrigeration circuit comprising a compressor (11) driven by an engine (20), an outdoor heat exchanger (12), an expansion valve (13) and an indoor heat exchanger (14) connected by a refrigerant pipe. (10) and an exhaust system (3 for exhausting exhaust gas of the engine (20)
0) and a drain water reformer (40) for reforming drain water generated in the exhaust system (30) to neutral or alkaline and discharging it.
A drain water reformer for an engine-driven air conditioner comprising: a drain water reformer (40), and a plurality of metal members made of a magnesium material and a reforming tank (41) for circulating the drain water. (42, 43, 44) to dissolve the Mg ²⁺ ions in the drain water from the plurality of metal members (42, 43, 44) to remove the drain water in the reforming tank (41). A drain water reformer for an engine-driven air conditioner, which is configured to be reformed to be neutral or alkaline. 2. The metal members (42, 43, 44) are
At least one set of electrodes (42, 43, 44),
The drain water reformer (40) includes the electrodes (42, 4).
3. The drain water is reformed to be neutral or alkaline by applying a voltage between the electrodes 3 and 44) to dissolve Mg ²⁺ ions in the reforming tank (41). A drain water reformer for an engine-driven air conditioner as described in 1. 3. The drain water reformer (40) has a first energization mode in which a positive voltage is applied to one of the electrodes (42, 43, 44) and a negative voltage is applied to the other of the electrodes (42, 43, 44); A positive voltage is applied to the electrodes (42, 43, 44) by having a voltage applying means (45) for alternately switching between a second energization mode in which a negative voltage is applied to one of the electrodes and a positive voltage is applied to the other. The drain water is reformed to neutral or alkaline by dissolving Mg ²⁺ ions in the reforming tank (41) from the electrodes (42, 43, 44) on the charged side. The drain water reformer of the engine-driven air conditioner according to 2. 4. The exhaust system (30) is provided with an exhaust member (32, 33) made of a stainless material, and the plurality of metal members (42, 43, 44) are attached to the exhaust member (32, 33). The drain water reformer (40) is electrically connected to the plurality of metal members (42, 43, 44).
Generate a standard electrode potential difference between the exhaust member (32, 33) and the plurality of metal members (42, 43, 44).
2. The engine according to claim 1, wherein Mg ²⁺ ions are dissolved in the drain water to reform the drain water in the reforming tank (41) to be neutral or alkaline. Drain water reformer for drive air conditioner. 5. An opening / closing means (46) for opening and closing electrical connection between the metal member (42, 43, 44) and the exhaust member (32, 33) is provided with the metal member (42, 43, 4).
4) is provided between the exhaust member (32, 33),
The drain water reformer (40) is the engine (20).
The drain water reformer for an engine-driven air conditioner according to claim 4, wherein the opening / closing means (46) is made conductive when the engine is operating.