Stoves and furnaces – Liquid heater – Open-top vessel that may include lid
Reexamination Certificate
1999-10-19
2001-02-27
Yeung, James C. (Department: 3743)
Stoves and furnaces
Liquid heater
Open-top vessel that may include lid
C126S357100, C099S403000
Reexamination Certificate
active
06192880
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid heating apparatus such as a fryer, a noodle boiling machine or the like, and in particular, to a liquid heating apparatus which can effectively heat a liquid in a liquid bath.
2. Description of the Related Art
Conventionally, a fryer used as this type of liquid heating apparatus has been disclosed in Unexamined Utility Model Publication (Kokai) No. 61-52152, for example. As shown in FIG.
9
and
FIG. 10
, the fryer
1
has a liquid bath
3
which is located on an upper portion of a main body
2
, and a plurality of exhaust pipes
4
(four in
FIG. 9
) are arranged in a horizontal state at the substantially central position in a height direction of the liquid bath
3
. These exhaust pipes extend penetratingly from one end side
3
a
(front side of the main body
2
) toward the other side
3
b
(rear side of the main body
2
). Each exhaust pipe
4
is provided with connective pipes
5
a
and
5
b
which are inclined right and left and alternately extend in a shape of cross in the exhaust pipe
4
, at a predetermined interval in a longitudinal direction thereof.
Moreover, a lower portion on one end side
3
a
of the liquid bath
3
is formed with a combustion chamber
9
which comprises a horizontal wall
6
, a vertical wall
7
and a cover
8
downwardly extending from the front end of the horizontal wall
6
, and a gas burner
10
is arranged in the combustion chamber
9
. A bottom portion of the liquid bath
3
on the lower portion of the exhaust pipe
4
, is inclined so as to become low on its forward side, and a portion just under the bottom portion is provided with a drain cock
11
, and further, a waste oil box
12
is arranged at a downward position of the drain cock
11
in the man body
2
.
In the fryer
1
, when the combustion chamber
9
is filled with a combustion gas generated by a combustion of the gas burner
10
, the horizontal wall
6
of the liquid bath
3
is directly heated so as to heat an oil
13
in the liquid bath
3
. Then, the combustion gas comes into the exhaust pipe
4
, and flows through the interior of exhaust pipe
4
as shown by an arrow A, and thus, is discharged from a discharge cylinder
14
to the outside.
In this case, four exhaust pipes
4
are arranged in a horizontal state; therefore, the oil
13
in the liquid bath
3
is heated by the combustion gas flowing through the exhaust pipe
4
while being heated by the connective pipes
5
a
and
5
b
located in the exhaust pipe
4
. Whereby an upper portion of the liquid bath
3
from the exhaust pipe
4
becomes a high temperature section; on the other hand, a lower portion of the liquid bath
3
from the exhaust pipe
4
becomes a low temperature section. Further, a food is deep-fried in the oil
13
of the high temperature section while being prevented from falling into the low temperature section by a net
15
arranged on the upper portion of the exhaust pipe
4
.
However, this fryer
1
has a construction in which four cylindrical exhaust pipes
4
are arranged at the lower portion of the liquid bath
3
, and the exhaust pipe
4
is provided with the totaled six connective pipes
5
a
and
5
b
arranged like a shape of cross. For this reason, a heating surface area of the combustion gas flowing through the exhaust pipe
4
is small with respect to the exhaust pipe
4
; as a result, it is impossible to effectively the oil
13
of the liquid bath
3
by means of the gas burner
10
. Thus, the aforesaid fryer
1
has a problem that it is difficult to obtain a sufficient heat efficiency.
Moreover, a temperature of the combustion gas flowing through the exhaust pipe
4
becomes highest at an inlet side on the combustion chamber
9
side of the exhaust pipe
4
, and becomes lowest at an outlet side on the discharge cylinder
14
side. In the above fryer
1
, the totaled six connective pipes
5
a
and
5
b
are merely extended in a diametrical direction of the exhaust pipe
4
, and are arranged along the longitudinal direction thereof at a substantially constant interval. For this reason, it is difficult to obtain a heat conduction along a temperature gradient of the combustion gas flowing through the exhaust pipe
4
; as a result, there is a problem that a temperature difference is easy to be generate in the oil
13
in the longitudinal direction of the liquid bath
3
. In addition, a pressure loss is easy to be generated in an exhaust pipe
4
section forming a heat exchange section, and an outer dimension of the exhaust pipe section becomes large; for this reason, there is a problem that a cleaning performance is worse.
SUMMARY OF THE INVENTION
The present invention has been made taking the aforesaid problems in the prior art into consideration. An object of the invention defined in the first aspect (claim
1
) is to provide a liquid heating apparatus which can obtain a sufficient heat efficiency by making large a heating surface area by a combustion gas flowing through an exhaust pipe located in a liquid bath.
Further, in addition to the object of the invention defined in the first aspect, an object of the invention defined in the second aspect (claim
2
) is to provide a liquid heating apparatus which can obtain a sufficient heat efficiency, and can uniformly heat a liquid in the liquid bath.
Further, in addition to the object of the invention defined in the first or second aspect, an object of the invention defined in the third aspect (claim
3
) is to provide a liquid heating apparatus which can simplify a construction of the exhaust pipe.
Further, in addition to the object of the invention defined in the first to third aspects, an object of the invention defined in the fourth or fifth aspect (claim
4
or
5
) is to provide a liquid heating apparatus which is constructed in a manner that the exhaust pipe is readily manufactured.
To achieve the above objects, the invention defined in the first aspect provides a liquid heating apparatus including: a liquid bath; a combustion chamber which is provided with a burner, and is formed at one side on a lower portion of the liquid bath; and an exhaust pipe which is located in a substantially horizontal state at an intermediate portion of the liquid bath, and extends from one side of the liquid bath toward the other side thereof, and heating a liquid in the liquid bath by passing a combustion gas generated in the combustion chamber into the exhaust pipe, wherein a fin is integrally located on an inner surface of the exhaust pipe along a longitudinal direction thereof.
With the above construction, the combustion gas generated by the combustion of the burner comes into the exhaust pipe from the combustion chamber, and then, flows through the exhaust pipe so as to heat the fins which are integrally fixed to the inner surface of the exhaust pipe during the passage of the combustion gas. The fins serve to make large a heating surface area of the combustion gas with respect to the exhaust pipe, and therefore, the heat of the fin is transferred to the exhaust pipe so that a liquid existing around the upper portion of the exhaust pipe is effectively heated; as a result, a sufficient heating efficiency.
Further, the invention defined in the second aspect provides the liquid heating apparatus wherein the fin has a heating surface area which is set in accordance with a temperature gradient in a longitudinal direction of the exhaust pipe. With the above construction, for example, the height of the fin is made lower at an inlet side of the exhaust pipe where the combustion gas temperature is high, and is made higher at an outlet side of the exhaust pipe where the combustion gas temperature is low. Whereby a heating surface area of the fin is set in accordance with a temperature gradient, so that a heat (temperature) of the combustion gas can be further effectively transferred to the exhaust pipe via the fin. As a result, a sufficient heating efficiency can be obtained.
Further, the invention defined in the third aspect provides the liquid heating apparatus wherein
Eiken Industries Co. Ltd.
Harness & Dickey & Pierce P.L.C.
Yeung James C.
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