Flame detector purging device

Abstract

The utility model relates to a flame detector purging device, which is structurally characterized in that a flame detector is mounted in an outer protective cover, the detection end of the flame detector is aligned to the combustion flame direction of a boiler, the outer protective cover comprises a top cover and a stainless steel shell which are mutually connected, and a detection hole is formed in the side surface of the stainless steel shell and corresponds to the detection end of the flame detector; the top cover is provided with an air pipe connector and a flame detector connector, the flame detector is installed in the stainless steel shell through the flame detector connector, the air pipe connector is connected with one end of a purging air pipe, and the other end of the purging air pipe is externally connected with a micro air pump. The electric eyeshade has the advantages that the structural design is simple and reasonable, a common electric eyeshade in the prior art is designed into the electric eyeshade with the air purging function, and the electric eyeshade is externally connected with the micro air pump for purging, so that condensation can be effectively avoided, good light transmission of the flame detector in the flame detection direction can be ensured, and the problem that the boiler flame detector is interfered by condensate water or dust can be solved; and the boiler operation stability is improved.

Description

Technical Field

[0001] This utility model relates to a flame detector purging device, specifically a purging device for the outer protective cover of a flame detector in a combustion furnace such as a boiler / TO furnace. Background Technology

[0002] For vacuum hot water boilers with external flue gas circulation pipes, natural gas produces H2O and CO2 during combustion. Gaseous H2O (water vapor) returns to the burner through the external flue gas circulation pipe, where it mixes with the cooler combustion air, generating a large amount of condensate. This condensate accumulates on the outer protective cover (commonly known as the "electric eye cover") of existing flame detectors, obstructing the light source and causing inaccurate flame detection. This, in turn, leads to frequent boiler malfunctions and shutdowns. Utility Model Content

[0003] This utility model proposes a flame detector purging device, which aims to overcome the above-mentioned shortcomings of the existing technology, improve the problem of condensation water blocking the light source propagation of the outer protective cover of the flame detector, and improve the sensitivity and accuracy of flame detection.

[0004] The technical solution of this utility model is a flame detector purging device, which includes an outer protective cover, a purging air pipe, and a miniature air pump. A flame detector is installed inside the outer protective cover, with its detection end aligned with the direction of the boiler combustion flame. The outer protective cover includes a top cover and a stainless steel outer shell connected to each other. Detection holes are opened on the side of the stainless steel outer shell corresponding to the detection end of the flame detector. The top cover has an air pipe interface and a flame detector interface. The flame detector is installed inside the stainless steel outer shell through the flame detector interface. The air pipe interface connects to one end of the purging air pipe, and the other end of the purging air pipe is connected to the miniature air pump. During operation, the boiler generates a combustion flame, and the miniature air pump starts, continuously supplying purging air to the outer protective cover through the purging air pipe. This ensures that the area inside the outer protective cover is under positive pressure and has a uniform temperature, preventing condensation caused by the temperature difference of the boiler flue gas and thus preventing interference with the flame detector's observation of the boiler combustion flame.

[0005] Preferably, the air pipe interface is aligned with the portion between the flame detector and the detection hole. This improves the purging effect.

[0006] The advantages of this utility model are: the structural design is simple and reasonable, and the existing ordinary electric eye mask is designed as an electric eye mask with air blowing function. By blowing with an external micro air pump, condensation can be effectively avoided, ensuring good light transmission of the flame detector in the direction of the flame. It can solve the problem of boiler flame detector being interfered with by condensate or dust, and improve the stability of boiler operation. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the working state of existing flame detectors.

[0008] Figure 2 yes Figure 1 A schematic diagram of the structure of the Chinese and foreign protective covers.

[0009] Figure 3 This is a schematic diagram of the structure of the flame detector purging device of this utility model.

[0010] Figure 4 yes Figure 3 A top view of the protective shields from both inside and outside the building.

[0011] Figure 5 yes Figure 3 Cross-sectional view of the Chinese and foreign protective covers.

[0012] Figure 6 yes Figure 3 Front view of the Chinese and foreign protective covers.

[0013] In the diagram, 1 is the boiler combustion flame, 2 is the flame detector, 3 is the outer protective cover, 31 is the light-transmitting glass, 32 is the top cover, 321 is the gas pipe interface, 322 is the flame detector interface, 33 is the stainless steel shell, 331 is the detection hole, 4 is the purge gas pipe, and 5 is the miniature air pump. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0015] like Figure 3-6 As shown, a flame detector purging device includes an outer protective cover 3, a purging air pipe 4, and a micro air pump 5. A flame detector 2 is installed inside the outer protective cover 3, with the detection end of the flame detector 2 aligned with the direction of the boiler combustion flame 1. The outer protective cover 3 includes a top cover 32 and a stainless steel shell 33 connected to each other. A detection hole 331 is opened on the side of the stainless steel shell 33 corresponding to the detection end of the flame detector 2. An air pipe interface 321 and a flame detector interface 322 are opened on the top cover 32. The flame detector 2 is installed inside the stainless steel shell 33 through the flame detector interface 322. The air pipe interface 321 is aligned with the part between the flame detector 2 and the detection hole 331. The air pipe interface 321 is connected to one end of the purging air pipe 4, and the other end of the purging air pipe 4 is connected to the micro air pump 5.

[0016] Based on the above structure, when the boiler is turned on, it generates boiler combustion flame 1. At the same time, the micro air pump 5 starts and continuously provides purge air to the outer protective cover 3 through the purge air pipe 4, ensuring that the outer protective cover 3 is under positive pressure and has a uniform temperature. This can prevent condensation caused by the temperature difference of boiler flue gas and prevent it from affecting the observation of boiler combustion flame 1 by the flame detector 2.

[0017] In actual use, the miniature air pump 5 is connected to an external power supply, and the flame detector 2 is connected to the boiler control module. The miniature air pump 5 can be interlocked with the boiler's on / off operation; once the boiler is turned on, the air pump will start and continuously provide purge air to the electric shock mask.

[0018] The specific working principle of air purging is as follows: the purging air comes out from the micro air pump 5, passes through the purging air pipe 4 and enters the outer protective cover 3, and then comes out from the detection hole 331; the pressure of the purging air should be greater than the maximum total pressure of the boiler combustion fan, and the pressure should generally be >5kPa.

[0019] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A flame detector purging apparatus, characterized by, It includes outer protective cover (3), blowing gas pipe (4) and micro air pump (5), wherein outer protective cover (3) is installed flame detector (2) inside, and the detection end of flame detector (2) is aligned with the direction of boiler combustion flame (1), and outer protective cover (3) includes mutually connected top cover (32) and stainless steel shell (33), and the side surface of stainless steel shell (33) is provided with detection hole (331) apart from the corresponding part of the detection end of flame detector (2), and top cover (32) is provided with gas pipe interface (321) and flame detector interface (322), and flame detector (2) is installed in stainless steel shell (33) through flame detector interface (322), and gas pipe interface (321) is connected with one end of blowing gas pipe (4), and the other end of blowing gas pipe (4) is connected with micro air pump (5) outside.

2. A purging apparatus for a flame detector as defined in claim 1, wherein The gas pipe interface (321) is aligned with the part between flame detector (2) and detection hole (331).

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