Premixer

Abstract

The premixer comprises a premixing shell, an air pressure sampling pipe and a proportional valve, an inner cavity of the premixing shell is a premixing cavity, the premixing shell is provided with an air inlet channel, one side of the premixing shell is provided with a gas connector, the air inlet channel and the gas connector are both communicated to the premixing cavity, and the premixing cavity is communicated to a fan; the wind pressure sampling pipe is mounted at the top of the premixing shell; one end of the air pressure sampling pipe is a sampling port, the other end of the air pressure sampling pipe is a connecting port, the sampling port is an inclined notch, and the direction of the notch faces the air inlet direction; the sampling port is close to the central axis of the air inlet channel; the connecting port is connected with a soft pipe and connected with the proportional valve, and the proportional valve adjusts the opening degree of the proportional valve through collected air pressure so as to control the amount of gas connected into the gas connector. Therefore, the technical problems that an existing air pressure sampling structure of the premixer is complex in overall structure and high in manufacturing cost, and the machining cost is increased are solved.

Description

Technical Field

[0001] The present application relates to the technical field of gas mixing devices, and in particular to a premixer. Background Art

[0002] A premix burner is a burner that mixes fuel gas and air evenly before burning. Its combustion flame is very stable and compact, and is characterized by fast combustion speed and intense combustion. A premix burner usually has a premixer for mixing gas and air, so that the gas and air are evenly mixed and then introduced into the burner through a fan for combustion; and the air inlet pressure in the air inlet channel of the premixer will affect the mixing degree and concentration of the gas and air in the premixing chamber. When only part of the air is mixed before combustion, incomplete combustion will produce more harmful gases such as CO and NOx, which does not meet the requirements of environmental protection; in existing premixers, in order to better adjust the gas volume according to the wind pressure, a wind pressure sampling port is usually provided, but the existing wind pressure sampling port is usually provided with a wind pressure sensor to form an electrical signal connection for regulation, but the overall structure is complex and the cost is high, which increases the processing cost. Utility Model Content

[0003] The utility model aims to solve the above technical problems and provide a burner. The wind pressure sampling structure of the premixer of the present application is simple, the production cost is reduced and the error is small.

[0004] In order to achieve the above object, the technical solutions of the utility model include:

[0005] A burner comprises a premixing shell, a wind pressure sampling tube and a proportional valve, wherein the inner cavity of the premixing shell is a premixing chamber, the premixing shell is provided with an air inlet channel, and a gas interface is provided on one side, the air inlet channel and the gas interface are both connected to the premixing chamber, and the premixing chamber is connected to a fan; the wind pressure sampling tube is horizontally installed on the top of the premixing shell; one end of the wind pressure sampling tube is a sampling port, and the other end is a connecting port, the sampling port is an inclined incision, and the direction of the incision is toward the direction of air inlet; the sampling port is close to the central axis of the air inlet channel; the connecting port is connected to a soft tube connected to the proportional valve, and the proportional valve adjusts the opening of the proportional valve according to the collected wind pressure to control the amount of gas connected to the gas interface.

[0006] In the present application, the premixing chamber of the premixing shell is used to evenly mix the gas and air, the air inlet channel provided in the premixing shell is connected to the premixing chamber, and the wind pressure sampling tube provided on the top of the premixing shell can collect the wind pressure of the air inlet. One end of the wind pressure sampling port is a sampling port for collecting wind pressure, and the sampling port is an inclined incision, and the incision is facing the direction of the air inlet. After the airflow is input into the tube through the incision of the sampling port, the wind pressure is transmitted to the proportional valve through the soft tube through the connecting port. When the wind pressure collected into the air inlet channel is large, the negative pressure in the tube is larger, and the proportional valve increases the opening according to the transmitted negative pressure, thereby ensuring that the concentration of the gas input into the premixing chamber remains at a preset value, ensuring complete combustion; the incision of the sampling port is inclined and close to the central axis, and the airflow in the middle of the air inlet channel can be collected, ensuring that the sampled wind pressure is more accurate, and the wind pressure can enter the tube from the inclined incision in a large proportion, effectively reducing the error of the collected wind pressure; the overall structure of the wind pressure collection device of the present application is simple, the error of the collected wind pressure is small, and the installation is simple while effectively reducing the processing cost.

[0007] In one embodiment, the sampling port has a cutout angle ranging from 30° to 40°. A certain cutout angle can reduce the error of the collected wind pressure.

[0008] In one of the embodiments, the side wall of the air inlet channel shrinks downward in an arc shape, and an air inlet is provided at the bottom of the air inlet channel to communicate with the premixing chamber.

[0009] In one embodiment, a threaded section is provided on one side of the outer wall of the wind pressure sampling tube close to the sampling port to facilitate installation.

[0010] In one of the embodiments, a mounting hole is provided at the upper end of the premix shell, and the wind pressure sampling tube is fixed to the mounting hole via the threaded section. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The overall structural diagram of the premixer provided by the utility model;

[0012] Figure 2 This is a structural schematic diagram of the wind pressure sampling tube provided by the utility model. DETAILED DESCRIPTION

[0013] The embodiment of the present application provides a premixer for solving the technical problem that the wind pressure sampling port of the existing premixer is usually provided with a wind pressure sensor to form an electrical signal connection for regulation, but the overall structure is complex and the cost is high, which increases the processing cost.

[0014] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] See also Figure 1 to Figure 2 The embodiment of the present application provides a burner, including a premixing shell 100, a wind pressure sampling tube 200 and a proportional valve 300, wherein the inner cavity of the premixing shell 100 is a premixing chamber 110, the premixing shell 100 is provided with an air inlet channel 120, and a gas interface 130 is provided on one side, the air inlet channel 120 and the gas interface 130 are both connected to the premixing chamber 110, and the premixing chamber 110 is connected to the fan; the wind pressure sampling tube 200 is horizontally installed on the premixing shell 100 Top; one end of the wind pressure sampling tube 200 is a sampling port 210, and the other end is a connecting port 220, the sampling port 210 is an inclined incision, and the direction of the incision is toward the direction of the air intake; the sampling port 210 is close to the central axis of the air inlet channel 120; the connecting port 220 is connected with a soft tube and connected to the proportional valve 300, and the proportional valve 300 adjusts the opening of the proportional valve 300 according to the collected wind pressure to control the amount of gas connected to the gas interface 130.

[0016] Specifically, an air inlet channel 120 connected to the outside is provided in the middle of the premixing shell 100, and a gas interface 130 is provided on one side of the premixing shell 100 to be connected to the inner cavity. The inner cavity of the premixing shell 100 forms a premixing chamber 110 for mixing gas and air. The air inlet channel 120 is arc-shaped, and the bottom is connected to the premixing chamber 110; the bottom of the premixing chamber 110 is connected to a fan for exporting the mixed gas; a wind pressure sampling tube 200 is horizontally installed at the air inlet channel 120 on the top of the premixing shell 100. When the fan is working, air is input into the premixing chamber 110 through the air inlet channel 120 and mixed with the gas. The airflow generated by the air inlet channel 120 passes through the sampling port 210 of the wind pressure sampling tube 200, and the airflow can be carried out from the sampling port 210 to the inner cavity of the wind pressure sampling tube 200; the sampling port 210 is a cutout with a certain inclination angle, and the cutout direction is upward, so that the airflow can enter the wind pressure sampling tube 20 along the cutout 0, and then transmitted to the connecting port 220; the connecting port 220 is connected with the proportional valve 300 that controls the amount of gas through a soft tube, and the soft tube can be a rubber tube. When the airflow enters the wind pressure sampling tube 200, the pressure can be transmitted to the proportional valve 300 through the soft tube, and the negative pressure formed in the tube is transmitted to the sensing port of the proportional valve 300. The proportional valve 300 controls the opening according to the transmitted negative pressure, and then adjusts the output gas volume. When the wind pressure is greater, the negative pressure formed in the tube is greater, and the opening of the proportional valve 300 increases accordingly, so that the concentration of the gas input to the premixing chamber 110 can be maintained, so that the concentration of the gas introduced into the fan is maintained at a preset value, so as to ensure complete combustion, and it is not easy to produce too much harmful gas to harm the environment. The structure of the wind pressure sampling tube 200 is simple, and the opening of the proportional valve 300 can be accurately adjusted through the setting of the incision, which can effectively achieve the control effect while reducing the production cost.

[0017] Furthermore, the incision angle of the sampling port 210 ranges from 30° to 40°. In this embodiment, the angle of the incision is preferably 35°, that is, the angle formed by the cross section of the incision and the axis of the wind pressure sampling tube 200; the inclination angle of the incision can make it easy for the airflow to enter the wind pressure sampling tube 200; when the angle of the incision is too large, the incision is biased to vertical, the windward surface area at the incision is small, and the proportion of air volume entering the tube is small. On the contrary, when the angle of the incision is too small, the windward area at the incision is large, the proportion of air volume entering the tube is too large, and the length of the incision is long, which affects the sampling accuracy of the sampling port. The incision angle in the appropriate range can make the error of the collected wind pressure transmitted to the proportional valve 300 smaller.

[0018] Furthermore, the side wall of the air inlet channel 120 shrinks downward in an arc shape, and an air inlet 121 is provided at the bottom of the air inlet channel 120 to communicate with the premixing chamber 110. The air inlet channel 120 is located in the middle of the premixing housing 100, and the overall diameter gradually decreases from top to bottom. The side wall is in an arc shape, and an air inlet 121 is provided at the bottom to communicate with the premixing chamber 110. The arc-shaped side wall makes the air intake smoother and the airflow stable. When the airflow flows through the wind pressure sampling tube 200, it is consistent with the airflow pressure entering the premixing chamber 110, ensuring that the collected data is more accurate.

[0019] Furthermore, a threaded section is provided on the side of the outer wall of the wind pressure sampling tube 200 close to the sampling port 210. A mounting hole is provided at the upper end of the premix shell 100, and the wind pressure sampling tube 200 is fixed to the mounting hole through the threaded section. The mounting hole provided at the side wall of the premix shell 100 near the top cooperates with the threaded section provided on the outer wall of the wind pressure sampling tube 200, and both installation and disassembly can be performed quickly, and it is convenient to adjust the sampling position of the sampling port 210 in the air inlet channel; the side wall of the wind pressure sampling tube 200 on the side of the threaded section close to the connecting port 220 extends outward to form a hexagonal limiting wall, and the limiting wall abuts against the premix shell 100, so that the wind pressure sampling port can be operated through the limiting wall during disassembly.

[0020] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A premixer, comprising a premixing housing, a wind pressure sampling tube and a proportional valve, characterized in that: The inner cavity of the premixing shell is a premixing chamber, the premixing shell is provided with an air inlet channel, and a gas interface is provided on one side, the air inlet channel and the gas interface are both connected to the premixing chamber, and the premixing chamber is connected to the fan; the wind pressure sampling tube is horizontally installed on the top of the premixing shell; one end of the wind pressure sampling tube is a sampling port, and the other end is a connecting port, the sampling port is an inclined incision, and the direction of the incision is in the direction of air inlet; the sampling port is close to the central axis of the air inlet channel; the connecting port is connected to the proportional valve with a soft tube, and the proportional valve adjusts the opening of the proportional valve according to the collected wind pressure to control the amount of gas connected to the gas interface.

2. The premixer according to claim 1, characterized in that The incision angle of the sampling port ranges from 30° to 40°.

3. The premixer according to claim 1, characterized in that The side wall of the air inlet channel shrinks downward in an arc shape, and an air inlet is provided at the bottom of the air inlet channel and communicates with the premixing chamber.

4. The premixer according to claim 1, characterized in that A threaded section is provided on one side of the outer wall of the wind pressure sampling tube close to the sampling port.

5. The premixer according to claim 4, characterized in that The upper end of the premix shell is provided with a mounting hole, and the wind pressure sampling tube is fixed to the mounting hole through the threaded section.

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