Gas exhausting device and gas water heater

Abstract

The present utility model provides a gas exhausting device and a gas water heater, relating to the technical field of gas exhausting equipment. The gas exhausting device comprises an exhaust structure and a buffer structure, and gas in an exhaust channel is dischargeable from an exhaust port; the exhaust structure is further provided with a communication port located upstream of the exhaust port in a discharging flow direction of the gas; the buffer structure is used for forming a buffer cavity in communication with the exhaust channel through the communication port. In the present utility model, the buffer cavity of the buffer structure can weaken the vibration frequency and intensity of the waste gas to prevent transmission of the vibration of the waste gas to the exhaust structure to cause the problem of screech resonance, thereby improving the user's use experience. In addition, by the vibration damping effect of the buffer structure, the range of the ignition and flame spreading interval is enlarged, so that the problem of screech resonance would not occur in the exhaust structure even if the fan is at a larger or smaller speed, which reduces the difficulty of debugging the gas water heater and improves the reliability of the gas water heater.

1 . A gas exhausting device, characterized in that it comprises:
 an exhaust structure including an exhaust channel and an exhaust port, gas in the exhaust channel being dischargeable from the exhaust port, the exhaust structure being further provided with a communication port located upstream of the exhaust port in a discharging flow direction of the gas;   a buffer structure, the buffer structure being connected to the exhaust structure in a sealed manner to seal the communicating port, the buffer structure being used for forming a buffer cavity in communication with the exhaust channel through the communicating port.   
     
     
         2 . The gas exhausting device according to  claim 1 , characterized in that, the buffer structure includes an elastic element, and the elastic element forms the buffer cavity. 
     
     
         3 . The gas exhausting device according to  claim 2 , characterized in that, the gas exhausting device further comprises a mounting structure, the mounting structure is provided on the exhaust structure, and the buffer structure is connected to the exhaust structure in a sealed manner by means of the mounting structure. 
     
     
         4 . The gas exhausting device according to  claim 3 , characterized in that, the mounting structure includes a mounting seat, the mounting seat is provided at a periphery of the communication port, and the elastic element is connected to the mounting seat. 
     
     
         5 . The gas exhausting device according to  claim 4 , characterized in that, the buffer structure further includes a cover body, the cover body is disposed on the elastic element in a covering manner, the cover body is connected to the mounting seat, and the cover body is provided to be spaced apart from at least part of the elastic element to form an adjustment gap. 
     
     
         6 . The gas exhausting device according to  claim 5 , characterized in that, the cover body presses the elastic element onto the mounting seat to form a sealed structure. 
     
     
         7 . The gas exhausting device according to  claim 5 , characterized in that, the cover body is detachably connected to the elastic element. 
     
     
         8 . The gas exhausting device according to  claim 7 , characterized in that, the elastic element is constructed into a sleeve shape, a side edge of the elastic element is provided with a first pressed edge, and the first pressed edge is provided with a protrusion;
 the cover body is constructed into a sleeve shape, a side edge of the cover body is provided with a second pressed edge, the second pressed edge is provided with a groove, the protrusion can be engaged in the groove, the second pressed edge can press the first pressed edge onto the mounting seat to form a sealed structure, and the second pressed edge is detachably connected to the mounting seat.   
     
     
         9 . The gas exhausting device according to  claim 5 , characterized in that, the cover body is provided with at least one vent hole, and the vent hole connects the adjustment gap and external air. 
     
     
         10 . The gas exhausting device according to  claim 1 , characterized in that, the number of the communication port is one or more, and a ratio of a total area of the communication port(s) to a cross-sectional area of the exhaust structure is greater than a predetermined value. 
     
     
         11 . The gas exhausting device according to  claim 10 , characterized in that, the predetermined value is 1/54. 
     
     
         12 . The gas exhausting device according to  claim 1 , characterized in that, the exhaust structure further includes an exhaust seat and a connecting tube, the exhaust channel penetrates through the exhaust seat and the connecting tube, the exhaust port is located at a tail end of the connecting tube in a radial direction, and the communication port is provided on a side wall of the connecting tube. 
     
     
         13 . The gas exhausting device according to  claim 2 , characterized in that, the elastic element includes a rubber film. 
     
     
         14 . (canceled)