Steam producer capable of performing dual heating processes

Details Steam producer capable of performing dual heating processes Steam producer capable of performing dual heating processes

2003-08-26

2004-06-15

Wilson, Gregory A. (Department: 3749)

Liquid heaters and vaporizers

Flasher

C122S379000

Reexamination Certificate

active

06748904

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a steam producing device for use with a steam cleaning apparatus, more particularly one, which is made in such a manner that water therein will go through dual heating processes, and which is free from the risk of explosion.
2. Brief Description of the Prior Art
Steam cleaning apparatuses are becoming popular recently, which are equipped with steam producing devices, and can eject steam produced by steam producing devices onto various objects to remove dirt, kill bacteria plus increase humidity.
Referring to
FIGS. 6 and 7
, a conventional steam producing device
2
of steam cleaning apparatus includes a water tank
24
, a pump
23
connected to the water tank
24
by means of a conduit
244
, and a steam producer
21
connected to the pump
23
by means of a duct
233
; water is made to travel from the tank
24
through a water inlet
213
of the steam producer
21
by means of the pump
23
. The steam producer
21
consists of a housing
211
, and a heating pipe
212
disposed in the housing
211
; the heating pipe
212
is connected to conducting members
218
disposed outside the housing
211
so that it can be powered to produce heat for transforming water into steam rapidly.
In order for steam to stay in the housing
211
for extended length of time so that pressure of the steam can be increased, the housing
211
is divided into a steam producing chamber, a transitional chamber
225
, and a steam ejection chamber
222
; the steam producing chamber is divided into a main chamber
224
, and a subsidiary chamber, which is further divided into first, second, third, and fourth chambers
214
,
215
,
216
, and
217
of the same size by means of disposing separating boards
221
in between; the main chamber
224
is half the size of the whole steam producing chamber; the separating boards
221
have steam passages
223
. A steam outlet
219
is provided between the fourth chamber
217
and the transitional chamber
225
while a steam outlet
220
is provided between the transitional chamber
225
and the steam ejection chamber
222
. And, the steam ejection chamber
222
is provided with several steam ejection outlets
22
, which are equidistantly spaced so that steam can be ejected uniformly.
Water will become steam very rapidly after having passed into the main chamber
224
via the water inlet
213
because of the heating pipe
212
. And, steam in the main chamber
224
has to pass through the chambers
214
,
215
,
216
, and
217
via the passages
223
of the separating boards
221
, and then pass into the transitional chambers
225
from the fourth chamber
217
via the steam outlet
219
, and pass from the transitional chambers
225
into the ejection chamber
222
via the outlet
220
before it can be ejected from the ejection outlets
22
therefore the length of time is extended wherein steam travels through the housing
211
. Consequently, pressure of steam in the steam producer
21
becomes relatively high with steam being constantly produced.
The steam producing device
2
can transform water therein into steam very rapidly, and increase pressure of steam for the same to be discharged outside the outlets
22
at high speed to remove dirt, and kill bacteria effectively.
However, the steam producing device
2
can only perform single heating cycle therefore the heating capacity is limited to some degree. And, there is risk of explosion when the steam producing device
2
is working.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a steam producing device for use with a steam cleaning apparatus, in which water will go through dual heating processes, and which is free from the risk of explosion.
The steam producing device includes a strong outer shell, and a heating member inserted in, and secured to the outer shell. The heating member has a steam room, and forms a first, a second, and a third chamber together with the outer shell. The second chamber communicates with the first chamber owing to a gap, and communicates with the third chamber owing to a narrow curved passage provided between the heating member and the outer shell. A hole is formed on the heating member for the steam room to communicate with the third chamber. Thus, water and steam can travel through the chambers to go through one heating process, and then travel through the steam room to go through another heating process to be transformed into steam and discharged outside the shell for use after flowing into the first chamber; water and steam will undergo compression and expansion to have increased pressure when traveling through the gap and the narrow passage.


REFERENCES:
patent: 2604957 (1952-07-01), Williamson et al.
patent: 6299076 (2001-10-01), Sloan et al.

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