Variable-frequency heater

Abstract

A variable-frequency heater, which is provided in a heating space. A plurality of hot air channels are embedded in walls of the heating space. Hot air is output from the variable-frequency heater to the hot air channels for heating the heating space. The variable-frequency heater includes a housing, which includes a first enclosure plate, a second enclosure plate, a front support plate and an access panel, and a temperature controller. The housing is internally provided with a gas heating assembly, which includes a heat exchanger at a front end inside the housing. The heat exchanger is provided with an igniter. The access panel is provided with an exhaust panel, which is provided with an air outlet pipe and an air inlet pipe connected to the heat exchanger. The first enclosure plate is provided with a gas pipe connected to a gas source.

What is claimed is: 
     
         1 . A variable-frequency heater, the variable-frequency heater being provided in a heating space, a plurality of hot air channels being embedded in walls of the heating space, the variable-frequency heater being configured to output hot air to the plurality of hot air channels for heating the heating space, and the variable-frequency heater comprising:
 a housing; and   a temperature controller;   wherein the housing comprises a first enclosure plate, a second enclosure plate, a front support plate and an access panel; the housing is internally provided with a gas heating assembly; the gas heating assembly comprises a heat exchanger mounted at a front end inside the housing; and the heat exchanger is provided with an igniter;   the access panel is provided with an exhaust panel; the exhaust panel is provided with an air outlet pipe and an air inlet pipe that are connected to the heat exchanger; the air inlet pipe is connected to a fan such that air is blown into the heat exchanger to assist combustion; and the air outlet pipe is connected to an exhaust port of the heat exchanger; and   the first enclosure plate is provided with a gas pipe connected to a gas source; the gas pipe is connected to an inlet end of a gas proportional valve; and an outlet end of the gas proportional valve is connected to the igniter through a pipeline.   
     
     
         2 . The variable-frequency heater of  claim 1 , wherein the heat exchanger comprises a first structural part and a second structural part connected to each other; and the first structural part and the second structural part are both C-shaped;
 the first structural part is provided with a first groove, and the second structural part is provided with a second groove; and the first groove and the second groove are arranged opposite to each other, and are configured to form a dual-layer flow channel; and   an upper end and a lower end inside the second structural part are each provided with a connector; and two connectors are connected with each other, and are connected to the second groove.   
     
     
         3 . The variable-frequency heater of  claim 1 , wherein the igniter comprises a base plate mounted at a mouth of the heat exchanger; the base plate is provided with a nozzle fixing hole; a primary air distribution hole is provided on an outer side of the nozzle fixing hole; a side of the base plate is connected to a connecting pipe; the connecting pipe is connected to a burner; and the connecting pipe is provided at the primary air distribution hole;
 the burner is provided with a bracket; the bracket is provided with a lead-out electrode; the bracket is provided with an ignition pin above the lead-out electrode; a rear end of the ignition pin is connected to a feedback electrode with a pointed structure;   mounting positions of the feedback electrode, the ignition pin and the lead-out electrode on the bracket are each provided with an insulating pad; and   the base plate is further provided with a secondary air distribution hole and a plurality of mounting holes; and the secondary air distribution hole is arranged at an outer side of the primary air distribution hole.   
     
     
         4 . The variable-frequency heater of  claim 1 , wherein the fan comprises a fixing plate; the fixing plate is provided with a motor; and a first side of the motor is provided with a first impeller housing, and a second side of the motor is provided with a second impeller housing;
 the first impeller housing is rotatably provided with a heating impeller; a combustion impeller is rotatably mounted in the second impeller housing; and the combustion impeller and the heating impeller are connected to a rotating shaft of the motor;   a front side of the second impeller housing is connected to an air inlet, and a rear side of the second impeller housing is provided with an air outlet connected to the heat exchanger;   a side of the air inlet is provided with a first sampling port; the air outlet of the second impeller housing is provided with a second sampling port; and an air pressure sensor is provided inside the housing, wherein the air pressure sensor is an air differential pressure sensor;   the first sampling port is connected to a negative pressure detection terminal of the air pressure sensor, and the second sampling port is connected to a positive pressure detection terminal of the air pressure sensor; and   an air output direction of the heating impeller is configured to be oriented rearwardly, and face toward the heat exchanger; and an air outlet of the heating impeller is provided with a flow guide plate.   
     
     
         5 . The variable-frequency heater of  claim 1 , wherein a temperature control switch is provided inside the housing at a side of the heat exchanger, and a controller is provided inside the housing at a side of the fan.