JPS6242780A - Heat pump type steam washing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Field of industrial application) The present invention is mainly used in the manufacturing industry of automobiles, machine tools, etc., and is a heat pump type that cleans mechanical parts etc. with solvent vapor. This invention relates to improvements in steam cleaning equipment.

(Prior Art) A conventional heat pump type steam cleaning device is generally composed of a steam cleaning tank 1, a heat pump 2, a distillation tank 3, etc., as shown in FIGS. 2 and 3. It is configured to recover the heat of condensation of steam and heat the solvent solution.

That is, the steam cleaning tank 1 is a cleaning section 1 in which solvent vapor exists.
A cooling pipe 4 is provided on the side wall of the washing i1a and an electric heater 5 is provided in the storage portion 1b.

The heat pump 2 is composed of a compressor 2a, a condenser 2b, an expansion valve 2c, an evaporator 2d, etc., and a cooling water circulation pump 7 is interposed in the heat exchange pipe 6 of the evaporator 2d to connect the cooling pipe. 4, a solvent circulation pump 9 is interposed in the heat exchange pipe 8 of the condenser 2b, and the storage section 1b of the steam cleaning tank 1 is
They are connected in a circular manner.

Furthermore, the distillation tank 3 has a gas phase portion 3a and a liquid phase portion 3 inside thereof.
b, the gas phase part 3a communicates with the cleaning part 1a of the steam cleaning tank 1, and the liquid phase part 3b communicates with the drain pan 11 disposed below the object to be cleaned 10 in the cleaning tank 1. has been done.

Thus, the solvent solution in the steam washing tank 1 is heated by the heater 5 or the condensation tube 8 of the heat pump 2, and is evaporated. In addition, the generated solvent vapor is removed from the object to be cleaned 10.
and is cooled and condensed by the cooling pipe 4. At this time, the condensation heat given to the cooling pipe 4 is transferred to the cooling water 12 and the evaporator 2d.
The heat is collected as a heat medium in a heat pump, and after being raised in temperature and pressure by the heat pump, it is reused to heat the solvent solution. In this way, the solvent solution is heated and condensed by a so-called thermal closed cycle.

On the other hand, the solvent liquid condensed on the outer surface of the object 10 to be cleaned performs a cleaning action while flowing down along the outer surface of the object, and the contaminated solvent liquid after cleaning is collected on the drain pan 11. The collected contaminated solvent solution is subsequently led to the liquid phase portion 3b of the distillation tank 3 and heated by the heater 14. The solvent vapor distilled and purified by heating is returned to the cleaning section 1a, and is also passed through the cooling pipe 4.
The cleaning solvent liquid condensed by this is directly returned to the storage section 1b.

Note that FIG. 3 shows a configuration in which the condenser 2b of the heat pump 2 is immersed in the storage part of the steam cleaning tank 1, and is basically the same as the case in FIG. 2. Further, in FIGS. 2 and 3, reference numeral 15 is a blow valve of the distiller 113, which is used for discharging the concentrated contaminated solvent liquid.

The conventional heat pump type steam cleaning apparatus described above has a cleaning object 1.
0 quickly and reliably, and has excellent practical effects.

However, the conventional heat pump type steam cleaning apparatus still has many problems to be solved as described below.

(1) Since the heat exchange tube 8 and the heat pump condenser 2b are immersed in the storage part 1b of the steam cleaning process 1, it is extremely inconvenient to inspect the heat transfer surface and the bottom of the tank, and the structure of the storage part 1b The volume of is relatively large. As a result, the amount of solvent used increases, the heat capacity increases, and the responsiveness to the cleaning load decreases.

(2) Since the solvent solution in the storage part 1b is circulated and agitated by the circulation pump 9, the heat radiation loss from the tank IJI and the tank wall of the storage part 1b becomes large due to the heat transfer mechanism, and the thermal economy deteriorates.

(3) The heating system for 1g chemical solution consists of the heater 5 in the steam cleaning tank 1, the heater 14 in the distillation tank 3, and the heat pump 2.
Heating control and heating operations are extremely complicated because heating is performed three-dimensionally.

(4) Since the contaminated solvent liquid in the distillation tank 3 has a high attenuation, solid matter is likely to be deposited on the outer surface of the heater 14, which may easily cause a burn-out accident of the heater.

(Problems to be Solved by the Invention) The present invention is aimed at solving the problems (1) to (4) mentioned above in the conventional heat pump type steam cleaning equipment, By downsizing 1, it is possible to reduce the amount of solvent used, improve load response, and improve thermo-economic efficiency.It also eliminates direct heating of the solvent by an electric heater, and enables central heating of the solvent by a heat pump. The present invention provides a heat pump steam cleaning device that uses liquid heating to facilitate heating operations and prevent heater troubles.

In addition, the present invention makes it possible to significantly improve load response and thermal economy by using a new steam generation tank with a structure that purifies the solvent by using a difference in specific gravity in place of the conventional distillation tank 3. The present invention provides a heat pump type steam cleaning device.

(Means for Solving the Problems) The present invention includes a steam cleaning tank equipped with a cooling pipe and a tray pan in the cleaning section; 1) A diversion weir is provided in the liquid retention chamber, and a weir is installed between the cleaning liquid chamber and the bottom of the steam cleaning tank, between the concentrated liquid chamber and the tray pan, and between the inside of the tank and the steam cleaning tank. a steam generating tank that communicates with the cleaning section;
a heat pump comprising an evaporator that cools a refrigerant flowing in the cooling pipe of the steam cleaning tank and a condenser that heats the clean solvent liquid of the steam generation tank; The basic structure of the invention is a refrigerant tank having a heater provided therein.

(Function) The contaminated solvent solution collected on the drain pan 11 disposed in the steam cleaning tank 1 after washing the articles is transferred to the steam generation tank 16 via the pipe line 32! ! The liquid is compressed and returned to the liquid chamber 16a.

The contaminated solvent liquid in the IIW3 liquid chamber 16a is separated from time to time, the contaminated solvent liquid has a lower specific gravity and collects near the liquid surface, and the clean solvent liquid accumulates at the bottom of the concentrated liquid chamber.

The relatively clean solvent liquid separated by the difference in specific gravity enters the cleaning liquid chamber 16b via the undercover weir 24 and the overflow weir, and is sent to the condenser 2b of the heat pump 2 through the pipe line 21, where it is heated. Ru. The solvent in a gas-liquid mixed state heated in the condenser 2b is sent through the pipe line 22 into the steam generation tank 16, where gas-liquid separation is performed, and only the solvent vapor is passed through the pipe line 22.
6 and back into the steam cleaning PIII.

Further, the contaminated solvent liquid in the concentrate chamber la is led out to the outside through the funnel body 27 by opening the valve 4 as appropriate.

On the other hand, the condensation heat of the solvent vapor condensed in the cooling pipe 4 is transferred to the heat medium of the heat pump 2 via the cooling water 12 and the evaporator 2d, and is condensed by the compressed and heated heat medium.
In step d, the solvent solution is heated.

Also, when starting up the device or when the load suddenly increases, the auxiliary heater 31 of the water tank 17 is activated to supply heat to the heat medium of the heat pump 2. 'By increasing Sft, the heat for heating the solvent solution -1
Supplementary supply.

In the present invention, since heating of the solvent solution is performed centrally only by the heat pump 2, the heating operation is extremely fast.
Be stripped down. In addition, in order to purify contaminated solvent solutions by utilizing the difference in specific gravity of the solvent solutions, distillation, ? The energy consumption of the bottle is significantly reduced compared to the bottle made of #. (Embodiment) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a system diagram of a heat pump type steam cleaning apparatus according to the present invention, and the same reference numerals are used for the same components as those in FIGS. 2 and 3.

In the figure, 1 is a steam cleaning tank, 2 is a heat pump, 16 is a steam generation tank, and 17 is a refrigerant tank (water tank).

The steam cleaning tank 1 has a small volume liquid reservoir 18 formed at the bottom of the tank, and the entire space inside the tank except for the liquid reservoir 18 is a cleaning section 1a filled with solvent vapor. A cooling pipe 4 is arranged on the upper tank wall of the steam cleaning tank 1. The inlet end of the cooling pipe 4 is connected to a pipe line 19 with a cooling water circulation pump 7 interposed therebetween, and the outlet end of the cooling pipe 4 is connected to a tank. 17 are connected to the heat exchange tubes 6 of the heat pump evaporator 2d, respectively. Furthermore, a drain pan 11 is arranged in the center of the steam cleaning tank 1.
An object 10 to be cleaned, such as a mechanical part, is placed above it.

The heat pump 2 is composed of a compressor 2a, a condenser 2b, an expansion valve 2c, an evaporator 2d, etc.
The heat exchange tube 6 is 2. As mentioned above, the heat exchange tubes 8 of the analyzers a, 2, and d are connected to the cooling pipe 4 through the pipes 19 and 20, and to the steam generation tank 16, which will be described later, through the pipes 21 and 22, respectively.

The inside of the steam generating tank 16 is divided into a concentrated liquid chamber 16 a and a clean liquid chamber 16 b by an overflow weir 23, and an upper part is provided on the side of the overflow weir 23 of the concentrated liquid chamber 16 a. A sink weir with a through hole 24a is suspended from above. Steam generation tank 1 divided by the above-mentioned flow weir 23
The cleaning liquid chamber 16 b of No. 6 is connected to the artificial side of the heat exchange pipe 8 of the condenser 2 b by a pipe line 21 with a solvent circulation pump 9 interposed therebetween, and the bottom of the cleaning liquid chamber 16 b is connected to A pipe 25 communicates with the liquid reservoir 18 of the steam cleaning tank 1 .

On the other hand, steam generation 1I11 separated by the said weir n
The concentrated liquid chamber 16 a of No. 6 is connected to the heat exchange tube 8 of the condenser 2 b via a gas-liquid mixing tube 22 and to the drain pan 11 via a conduit 32 . The space is communicated with the inside of the cleaning section la of the steam cleaning tank 1 through a solvent vapor pipe 26.

A funnel body 27 is disposed near the solvent liquid surface of the concentration chamber 16a in a state buried in the liquid, and the lower part of the funnel body is connected to the outside of the concentrate chamber 16a through a pipe 28 and a valve 4. has been derived. In addition, 30 is a blow valve for the solvent liquid in the agricultural and dairy liquid chamber 16a.

The refrigerant tank 17 interposed in the pipe line 20 provides the refrigerant 12 with an auxiliary heat amount necessary at startup or during high load, and is equipped with an electric heater or a steam heater 31.

Next, the operation of the heat pump type steam cleaning will be explained.

The solvent vapor generated in the steam generation tank 16 is transferred to the solvent vapor pipe 2.
6 and is supplied to the cleaning section 1a of the steam cleaning tank 1. The solvent vapor in the cleaning section 1a is cooled and condensed by the object to be cleaned 10 and the cooling pipe 4, and the cleaning solvent liquid condensed by the cooling metal 4 is stored in the liquid reservoir 18 and then passed through the communication pipe 25 to generate steam. It flows into the cleaning chamber 16b of the tank 16.

On the other hand, the contaminated solvent solution that condensed on the outer surface of the object to be cleaned and flowed down while cleaning it along the surface of the object is received in the drain pan 11 and then passed through the conduit 32 to the concentrated liquid chamber.
6 Guided into a. By the way, since the concentrated contaminated solvent liquid has a lighter specific gravity than the cleaning solvent,
The solvent solution in a is separated according to the collapse and deterioration, and the solvent solution with low purity accumulates on the surface of the membrane, and the solvent solution with high purity accumulates at the bottom.

As a result, the cleaning solvent liquid is advected below the submerged weir 24 from the overflow weir 23 into the clean room 16b, and the contaminated solvent liquid that has accumulated near the liquid level in the concentration chamber 16a is By controlling the opening and closing of valve 4 by detecting the specific gravity or boiling point of the solvent solution, it is appropriately discharged from the system (the contaminated solvent solution has a lower specific gravity and a higher boiling point).0 Solvent vapor condensed on the cooling pipe 4 The heat of condensation is given to the cooling water 12 being circulated by the pump 7 via the cooling pipe 4, and is recovered from the heat medium tank of the heat pump 2 via the heat exchange pipe 6 of the evaporator 2d.

Further, at startup or under high load, the auxiliary heater 31 in the water tank 17 operates to provide the required amount of heat to the cooling water 12, thereby supplying a predetermined amount of supplementary heat via the heat pump 2.

The heat medium from which the heat of condensation has been recovered is compressed and heated in the heat pump 2 system, and in the condenser 2b, the cleaning solvent liquid flowing through the heat exchange tube s is heated by the circulation pump 9. The high-temperature solvent in a gas-liquid mixed state heated by the heat exchange tube 8 is returned to the solvent liquid in the concentrate chamber 16a through the pipe line 22, where the solvent gas and liquid are separated.

The solvent vapor separated in the concentrate chamber L6a and the through hole 24
The solvent vapor in the cleaning liquid chamber 16b, which has advected through the cleaning liquid chamber 16a, is supplied into the cleaning section la of the steam cleaning tank l through the solvent vapor pipe 26, as described above.

In the above embodiment, the liquid reservoir 18 is formed at the bottom of the steam cleaning tank 1. Of course, the liquid may be collected.

11 In this embodiment, the contaminated solvent liquid is discharged to the outside using the funnel 27, but it is possible to arrange an oblong tray inside the concentrate chamber, or to attach a drain pipe to the outer wall of the funnel. It is also possible to drain the contaminated solvent liquid from the liquid interlayer via the

Furthermore, in this embodiment, the tip of the gas-liquid mixing tube 22 is connected to the nuchal liquid chamber 1.
6a, but it is also possible to perform gas-liquid separation by ejecting the gas-liquid mixture into a space above the liquid surface.

Furthermore, in this embodiment, the circulation pump 9 is used to circulate the solvent liquid to the condenser 2b, but by immersing the condenser 2b into the cleaning liquid chamber 16b of the steam generation tank 16, the solvent liquid can be removed. It is also possible to carry out heating.

(Effects of the Invention) As described above, in the great invention, the steam generation tank 16 is separately provided, and the interior of the steam cleaning tank 1 is only the cleaning section 1a. As a result, unlike conventional steam cleaning tanks, there is no need for a large-capacity solvent storage section at the bottom of the tank, making it possible to downsize the cleaning tank 1 and reduce heat dissipation from the bottom of the cleaning tank. Become.

In addition, since the solvent liquid is heated only by the heat pump 2 and is not heated by an electric heater or the like, there is no burnout of the heater due to the precipitation of solids in the solvent, and the heating of the solvent liquid is unified. Heating operation and heating control become significantly easier.

Furthermore, in the present invention, a small steam generation tank is provided independent of the steam cleaning 1i11, and here the high temperature solvent gas-liquid mixture heated by the heat pump 2 is separated into gas and liquid, and the specific gravity of the solvent liquid is The difference is used to separate the contaminated solvent solution and the clean solvent solution. As a result, not only can the steam cleaning tank 1 be significantly downsized as described above, but the power cost can be reduced compared to solvent solution purification using the distillation method, and the steam generation tank 16 can be relatively small. Heat losses and required solvent layers are significantly reduced.

In addition, a tank 17 equipped with an auxiliary heater is installed in the system of the cooling pipe 4 of the steam cleaning tank 1, and the heater 31 transfers auxiliary heat to the cooling water 12 at the time of starting up the device or when the cleaning load suddenly increases.
Because of the groove structure, the device can be started up quickly, has high responsiveness to load fluctuations, and there is no fear of burnout of the heater.

As mentioned above, the present invention has excellent practical utility.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a heat pump type steam cleaning apparatus showing one embodiment of the present invention. FIGS. 2 and 3 are system diagrams of a conventional heat pump type steam cleaning device. 1 Steam cleaning tank 1a Cleaning section lb Storage section 2 Heat pump 2a BE condenser 1 2b Condenser 2c Expansion valve 2d Evaporator 4 Cooling pipe 6 Evaporator heat exchange pipe 7 Cooling water circulation pump 8 Condenser heat exchange pipe 9 Solvent liquid circulation Pump 10 Object to be cleaned 11 Drain pan 12 Cooling water 16 Steam generating tank 16 a Concentrating chamber 16 b Purifying chamber 17 Refrigerant tank 18 Liquid reservoir 19, 20, 21 Pipe line 22 Gas-liquid mixing pipe 23 Overflow weir 24 Undercover weir 25 Communication pipe 26 Solvent vapor pipe 27 Funnel 4 Control valve 31 Heater patent applicant Kanto Jidosha Kogyo Co., Ltd.

Claims (4)

[Claims] (1) Cooling pipe (4) and drain pan (
11); the interior is divided into a concentrated liquid chamber (16a) and a cleaning liquid chamber (16b) by an overflow weir (23), and a concentrated liquid chamber near the overflow weir (23); A submerged weir (24) is installed inside (16a), and a cleaning liquid chamber (16b
) and the bottom of the steam cleaning tank (1), there is a concentrated liquid chamber (
16a) and the drain pan (11) and between the inside of the tank and the cleaning section (1a) of the steam cleaning tank (1), respectively; a steam generating tank (16); the steam cleaning tank; (
a heat pump (2) comprising an evaporator (2d) that cools the refrigerant flowing through the cooling pipe (4) of 1) and a condenser (2b) that heats the cleaning solvent liquid in the steam generation tank (16); ;
A heat pump steam cleaning device comprising a refrigerant tank (17) having a heater (31) interposed in the refrigerant passage of the cooling pipe (4) of the steam cleaning tank (1). (2) The heat pump type steam cleaning device according to claim 1, which uses a steam cleaning tank (1) provided with a liquid reservoir (18) at the bottom of the tank. (3) The steam cleaning device according to claim 1, which uses a steam generation tank (16) that can freely discharge the solvent near the liquid level of the concentrated liquid chamber (16a) to the outside of the tank. (4) A patent claim using a steam generation tank (16) configured to circulate the gas-liquid mixture of solvent heated by the condenser (2b) of the heat pump (2) into the solvent liquid of the concentrated liquid chamber (16a). The steam cleaning device according to scope 1.