JPH0142782Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention mainly relates to a filter clogging detection device for a heater that supplies warm air to a room for heating.

(B) Prior Art Air conditioners that supply cold or hot air indoors are equipped with a filter for removing dust at the intake port, and a warning message is displayed if this filter becomes clogged. To detect clogging of this filter, in addition to displaying a timer when the air conditioner has been operated for a predetermined period of time, there is also a method that detects changes in the operating current of the blower motor, as disclosed in Japanese Utility Model Application Publication No. 56-10220. etc., but all of them require complicated circuits.

(c) Purpose of the invention The purpose of the invention is to display a filter clogging warning using the simple circuit components of the invention.

(d) Structure of the invention The structure of the invention is to arrange a heat source approximately in the center inside the outer case, provide an air intake port with a filter attached to the appropriate position of the outer case, and draw air into the outer case from this air intake port. In a heater that heats indoor air through a convection passage with a heat source and then discharges it into the room from a discharge port provided at a suitable location in the outer case, the indoor air sucked in from the intake port is placed outside the convection passage directly above the heat source. The auxiliary convection passage leading to the heat exchanger is divided and formed on the front plate, and a temperature switch is installed in the auxiliary convection passage above the heat exchanger on the front plate.
When the temperature of this part exceeds a predetermined temperature, a warning of filter clogging is issued.A relatively inexpensive temperature switch can be used to detect filter clogging, and since the ventilation temperature is detected, filter clogging can be detected accurately. can be detected.

(E) Embodiment First, an embodiment of the present invention will be explained based on FIG.
In addition, a discharge port 4 is also bored in the lower part of the front surface 2'' of the exterior case 2, and a vertically long thin box-shaped combustion chamber 5 with a substantially U-shaped cross section is provided in the center of the interior.
A convection passage 6, which communicates the intake port 3 and the discharge port 4, is provided between the exterior case 2 before and after the combustion chamber.
7 is divided into sections.

Further, a cross-flow type convection fan 8 is installed in the convection passages 6 and 7 in the vicinity of the discharge port 4, and a Bunsen type gas burner 9 as a heat source is installed upright in the lower part of the combustion chamber 5. In addition, a well-known filter 10 is detachably attached to the intake port 3.

Further, a front plate 11 is attached to the convection passage 6 from the top surface 2'' to the front surface 2'' of the outer case 2, and this front plate connects the convection passage 6 to the auxiliary convection passage 6 located inside the exterior case 2. ' and a convection passage 6'' located further inside this auxiliary convection passage, and a convection passage 7 is also provided on the rear surface of the combustion chamber 5.
Air supply holes 12 and 1 formed in the bottom plate 5' of the combustion chamber 5 allow a portion of the air sucked from the intake port 3 to flow into the combustion chamber 5.
A rear plate 14 is attached to define and define an air supply path 13 leading to the air supply section 2. Incidentally, the combustion hot air from the gas burner 9 flows into the convection passage 6'' through an exhaust port 15 opened on the upper surface of the combustion chamber 5.

Reference numeral 16 designates a temperature switch for detecting clogging of the filter 3, which is fixed in a thermally connected state facing the auxiliary convection passage 6' near the upper surface 2'' of the exterior case 2 of the front plate 11, and is also shown in FIG. DC power supply 17,1
7 is connected in series through a light emitting diode 18 for displaying a warning that the filter 3 is clogged, and is constituted by a normally open contact that closes the contact piece 16' when a predetermined set temperature is reached. Although a light emitting diode is used in the embodiment, a neon lamp or the like may be used and connected directly to a commercial power source.

If the filter 3 becomes clogged with dust or the like, the amount of ventilation to the convection passages 6 and 7 will decrease, causing the temperature of the front plate 11 to rise, which causes the temperature switch 16 to rise.
When the set temperature is reached, the contact piece 16' is closed and the light emitting diode 18 is energized to issue a warning.

(f) Effects of the invention With the configuration of the invention, filter clogging can be detected using an inexpensive temperature switch without using complicated circuit parts, thereby reducing costs and improving filter clogging detection accuracy. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a side longitudinal sectional view of a heating machine equipped with a filter clogging detection device according to the present invention, and FIG. 2 is an electric circuit diagram thereof. 6, 7...Convection passage, 16...Temperature switch,
3...Filter.

Claims (1)

[Scope of utility model registration request] A heat source is disposed approximately in the center of the exterior case, and an air intake port equipped with a filter is provided at a suitable location in the exterior case, and indoor air drawn into the exterior case from this intake port is passed through a convection passage to the heat source. In a heater that heats the room and then discharges it into the room from a discharge port provided at a suitable location in the outer case, an auxiliary convection channel is installed outside the convection channel to directly guide the indoor air sucked in from the intake port above the heat source. In addition to forming a section with a plate, a temperature switch is installed located in the auxiliary convection passage above the heat exchanger on this front plate, and a warning of filter clogging is provided when the temperature in this area exceeds a predetermined temperature. Features a heater filter clogging detection device.