CN-121993788-A - Combustion apparatus

Abstract

The invention provides a combustion device capable of improving combustion efficiency even under the condition that the pressure of air supplied into a furnace is monitored by an air pressure switch. In the combustion apparatus of the present invention, the temperature sensor is provided in the furnace for performing combustion, and detects the temperature in the furnace. The blower supplies air into the furnace via an air supply pipe. The air pressure switch is provided in the middle of the air supply pipe, and outputs an equipment abnormality signal when the pressure of the air supplied from the blower is smaller than a set pressure. The air supply prevention mechanism is provided in the air supply pipe at a position downstream of the air pressure switch, and is switched to prevent the supply of air supplied from the blower into the furnace or to supply the air supplied from the blower into the furnace, depending on the temperature in the furnace.

Inventors

• Gao Yangting
• HAMAGUCHI TAKAYUKI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241108

Claims (5)

1. 1. A combustion device is characterized by comprising: a temperature sensor provided in a furnace for performing combustion and detecting a temperature in the furnace; a blower that supplies air into the furnace via an air supply pipe; An air pressure switch provided in the middle of the air supply pipe and outputting an equipment abnormality signal when the pressure of the air supplied from the blower is smaller than a set pressure, and An air supply prevention mechanism provided in the air supply pipe at a position downstream of the air pressure switch, and switching to prevent supply of air supplied from the blower into the furnace or supply of air supplied from the blower into the furnace, depending on the temperature in the furnace.
2. 2. A combustion apparatus as claimed in claim 1, wherein, The air supply prevention means is a three-way valve that is switched to release air from the blower to the outside of the air supply pipe or to supply air supplied from the blower to the inside of the furnace, depending on the temperature inside the furnace.
3. 3. A combustion apparatus as claimed in claim 1, wherein, The air supply prevention means is a shutoff valve that is switched to shut off the supply of air supplied from the blower into the furnace or to supply air supplied from the blower into the furnace, depending on the temperature in the furnace.
4. 4. A combustion apparatus according to claim 3, comprising: An air flow rate adjusting mechanism capable of adjusting a flow rate of air supplied into the furnace by the blower, The air flow rate adjusting mechanism reduces a flow rate of air supplied into the furnace by the blower, compared to a case where the shutoff valve supplies air supplied from the blower into the furnace when the shutoff valve shuts off the supply of air supplied from the blower into the furnace.
5. 5. The combustion apparatus according to claim 4, comprising: An air flow rate adjusting mechanism capable of adjusting a flow rate of air supplied into the furnace by the blower, The air flow rate adjusting means adjusts the flow rate of the air supplied from the blower so that the pressure of the air supplied from the blower is not less than the set pressure of the air pressure switch when the shutoff valve shuts off the supply of the air supplied from the blower into the furnace.

Description

Combustion apparatus Technical Field The present invention relates to a combustion apparatus. Background Patent document 1 discloses a technique of omitting a pre-purge (air purge) before ignition of a gas combustion furnace when the closing time does not exceed a predetermined time. Patent document 1 Japanese patent laid-open No. 11-118147 Disclosure of Invention Between combustion ON and combustion OFF in the furnace, it is recommended to purge the inside of the furnace with air in the case where the temperature in the furnace is less than a constant temperature from the viewpoint of safety. However, in the case where the temperature in the furnace is not less than a constant temperature, it is clearly described in JIS, the purging of the air in the furnace may be omitted. Here, in a system conforming to the standard of JIS (e.g., JISB 8145), monitoring is performed by an air pressure switch to ensure that the pressure of air supplied into the furnace is not less than a set pressure. Under this monitoring, when air purge (i.e., supply of air into the furnace is stopped) is omitted as in the technique of patent document 1, an equipment abnormality signal is output from the air pressure switch. Therefore, in the technique of patent document 1, when the pressure of the air supplied into the furnace is monitored by the air pressure switch, the air purge cannot be omitted, and thus there is a problem that the combustion efficiency is lowered. In view of the above problems, an object of the present invention is to provide a combustion apparatus capable of improving combustion efficiency even when the pressure of air supplied into a furnace is monitored by an air pressure switch. A combustion apparatus includes a temperature sensor provided in a furnace for performing combustion and detecting a temperature in the furnace, a blower that supplies air into the furnace via an air supply pipe, an air pressure switch provided in the middle of the air supply pipe and that outputs an equipment abnormality signal when a pressure of the air supplied from the blower is smaller than a set pressure, and an air supply prevention mechanism provided in the air supply pipe at a position downstream of the air pressure switch and that switches to prevent supply of the air supplied from the blower into the furnace or supply of the air supplied from the blower into the furnace depending on the temperature in the furnace. In the combustion apparatus according to another aspect of the present invention, the air supply prevention means is a three-way valve that is switched to release air from the blower to the outside of the air supply pipe or supply air supplied from the blower to the inside of the furnace, depending on the temperature inside the furnace. In the combustion apparatus according to another aspect of the present invention, the air supply prevention means is a shutoff valve that shuts off the supply of air supplied from the blower into the furnace or supplies air supplied from the blower into the furnace, depending on the temperature in the furnace. In the above configuration, by providing the air supply prevention mechanism (the three-way valve or the shutoff valve) in the air supply pipe downstream of the air pressure switch, even when the pressure of the air supplied into the furnace is monitored by the air pressure switch, the air purge can be omitted, and the combustion efficiency can be improved. In the combustion apparatus according to the other aspect of the present invention, an air flow rate adjusting mechanism capable of adjusting a flow rate of air supplied into the furnace by the blower is provided, and the air flow rate adjusting mechanism reduces the flow rate of air supplied into the furnace by the blower when the shutoff valve shuts off the supply of air supplied into the furnace from the blower, as compared with a case where the shutoff valve supplies air supplied into the furnace from the blower. In the above configuration, by adjusting the flow rate of air in this manner, the load received by the shutoff valve to shut off air can be reduced. The combustion apparatus according to another aspect of the present invention includes an air flow rate adjustment mechanism capable of adjusting a flow rate of air supplied into the furnace by the blower, wherein the air flow rate adjustment mechanism adjusts the flow rate of air supplied from the blower so that a pressure of the air supplied from the blower is not less than the set pressure of the air pressure switch when the shutoff valve shuts off the supply of the air supplied from the blower into the furnace. In the above configuration, by adjusting the flow rate of air in this manner, it is possible to reduce the load that the air pressure switch receives when the air pressure switch does not output the device abnormality signal and the shutoff valve shuts off air. Effects of the invention The present invention can provide a combustion apparatus capable of im