Premixer and full-premixing gas heating water heater

Abstract

The premixer comprises a premixer body and an air conditioning assembly, the premixer body comprises an outer pipe and an inner pipe, and a fuel gas connector is arranged on the side portion of the outer pipe; the air conditioning assembly comprises an air inlet connector, an adjusting spring, an air inlet adjusting piece and a fixing shaft sleeve, an air guide part is arranged in the air inlet connector, the adjusting spring is arranged between the air inlet adjusting piece and the air guide part, and an air inlet adjusting nut is arranged at the outer end of the fixing shaft sleeve and used for adjusting an air inlet gap between the air inlet adjusting piece and the air guide part. According to the premixer, through the action of the air inlet adjusting nut, the mixing proportion of air and fuel gas reaches the best, the proper mixing proportion can be adjusted according to machine types with different powers, the applicability of the premixer is improved, and the universality is high.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heating water heaters, and particularly relates to a premixer and a fully premixed gas heating water heater. Background Art

[0002] A gas heating water heater, abbreviated as a wall-mounted boiler, is mainly used for winter heating and domestic hot water. With the promotion of the national coal-to-gas project, gas heating water heaters have been widely used and popularized. A gas heating water heater mainly consists of control, combustion, and heat exchange systems. It uses natural gas as fuel and transfers the heat generated by combustion to the circulating water of the system through the heat exchange system to provide domestic hot water and heating heat for users.

[0003] For a fully premixed gas heating water heater, before gas combustion, a negative pressure is generated in the premixer by the rotation of a blower, and the air inside the heating furnace is sucked into the premixer. At the same time, the gas proportional valve is opened, and gas enters the premixer through the gas inlet pipeline, realizing the full premixing of gas and air in proportion in the premixer, and then burning in the burner. Since the combustion of a fully premixed burner is not restricted by the mixing time and mixing space, it has the advantages of fast combustion speed, complete combustion, low nitrogen oxide emissions, and low noise, and has been increasingly used, especially in condensing water heaters and condensing heating furnaces.

[0004] Currently, the premixers of the prior art have the following problems: 1. The mixing ratio of gas and air is unreasonable, resulting in incomplete gas combustion. Different power models need to be matched with different premixers. Especially when operating at full load or low load, situations such as flameout or deflagration are likely to occur, leading to unstable combustion; 2. The applicability of the existing premixers in the market is insufficient. Multiple specifications of premixers are required for different power ranges, resulting in poor versatility; 3. Most of the existing premixers are used in combination with the gas valves and blowers of their respective manufacturers. Therefore, the compatibility of the installation interfaces of the premixers is poor, and most devices need to be additionally equipped with a threaded adapter for connecting the gas valve, resulting in increased costs and poor airtightness due to the addition of the adapter. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the present utility model is to provide a premixer to solve the above-mentioned traditional problems.

[0006] Another purpose of the present utility model is to provide a fully premixed gas heating water heater adopting the premixer.

[0007] One of the purposes of the present utility model is realized by adopting the following technical solution:

[0008] A premixer, comprising a device body and an air conditioning component installed on the device body. The device body includes an outer tube and an inner tube sleeved inside the outer tube. A gas interface is provided on the side of the outer tube, and a plurality of gas guiding ports are provided on the inner wall of the inner tube. A gas inlet passage communicating with the gas interface is formed among the inner wall of the outer tube, the outer wall of the inner tube, and the gas guiding ports. The inner tube is provided with a premixing chamber, and the premixing chamber communicates with the gas inlet passage; the air conditioning component includes an air inlet joint, an adjusting spring arranged inside the air inlet joint, an air inlet adjusting member, and a fixed shaft sleeve. A gas guiding portion communicating with the premixing chamber is provided inside the air inlet joint. Opposite ends of the air inlet adjusting member are provided with a first guiding rod and a second guiding rod. One end of the first guiding rod is sleeved inside the gas guiding portion, and one end of the second guiding rod is sleeved inside the fixed shaft sleeve. The adjusting spring is arranged between the air inlet adjusting member and the gas guiding portion and the adjusting spring is sleeved inside the first guiding rod. An air inlet adjusting nut abutting against the second guiding rod is provided at the outer end of the fixed shaft sleeve for adjusting the air inlet gap between the air inlet adjusting member and the gas guiding portion.

[0009] Preferably, the gas guiding ports are arranged from large to small along the gas flow direction.

[0010] Preferably, a side adjusting port communicating with the gas interface is further provided on the side of the outer tube, and a gas inlet adjusting nut is provided on the side adjusting port for adjusting the gas inlet volume of the gas interface.

[0011] Preferably, a mounting flange is further provided at the end of the outer tube, and a plurality of mounting holes are provided on the mounting flange, and the mounting holes are evenly distributed.

[0012] Preferably, a plurality of buckling ports are provided on the side of the outer tube, and a plurality of clamping blocks are provided on the air inlet joint, and the clamping blocks are clamped on the buckling ports.

[0013] Preferably, the inner tube is arranged from large to small along the gas flow direction.

[0014] Preferably, the gas guiding portion is provided with a gas guiding port that gradually narrows.

[0015] Preferably, the air inlet adjusting member is provided with a sealing slope surface adapted to the gas guiding port.

[0016] Preferably, the air inlet joint is further provided with a sealing end surface, and an O-ring seal is provided at the connection between the sealing end surface and the outer tube.

[0017] The second object of the present utility model is achieved by adopting the following technical solution:

[0018] A fully premixed gas heating and hot water boiler, comprising the above-mentioned premixer.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The premixer of the present utility model is provided with an air intake adjusting nut, which adjusts the air intake gap between the air intake adjusting member and the air guiding part, so as to adjust the air intake volume, make the mixing ratio of air and gas reach the best, and can adjust an appropriate mixing ratio according to different power models, so as to improve the applicability of the premixer and have high versatility.

[0021] 2. The premixer of the present utility model is provided with a side adjusting port on the gas interface, and through the action of the gas intake adjusting nut, the intake volume of the gas interface is adjusted, so that the whole device can completely adjust air and gas appropriately according to the power requirement of the water heater, and make the mixing ratio reach better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the premixer of the present utility model installed on a gas-fired heating water heater;

[0023] Figure 2 is Figure 1 a schematic structural diagram of the premixer shown;

[0024] Figure 3 is Figure 2 an exploded view of the premixer shown;

[0025] Figure 4 is Figure 2 a bottom view of the premixer shown;

[0026] Figure 5 is Figure 3 a top view of the main body of the device shown;

[0027] Figure 6 is Figure 3 a top view of the intake joint shown;

[0028] Figure 7 is Figure 2 a schematic diagram of the internal gas flow of the premixer shown.

[0029] In the figure: 10, premixer; 11, body of the device; 110, outer pipe; 111, inner pipe; 112, gas interface; 113, gas air guide port; 114, side adjustment port; 115, gas inlet adjustment nut; 116, mounting flange; 117, snap-fit port; 12, air adjustment assembly; 120, intake joint; 121, adjustment spring; 122, air intake adjustment part; 123, fixed shaft sleeve; 124, air guide part; 125, air intake adjustment nut; 126, snap-fit block; 127, O-ring seal; 20, heat exchanger; 30, fan; 40, gas proportional valve; 50, burner. Detailed implementation manners

[0030] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0031] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the description of the present utility model, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements at the same time. On the contrary, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0033] Please refer to Figures 1-7 , which is a premixer 10 of a preferred embodiment of the present utility model, used for installation on a fully premixed gas heating and hot water boiler. The fully premixed gas heating and hot water boiler further includes a heat exchanger 20, a fan 30, a gas proportional valve 40, a burner 50, etc. The gas interface 112 of the premixer 10 is connected to the gas proportional valve 40 through a connecting pipe with movable nuts at both ends, making the connection between the two more convenient for installation, with low cost and good sealing performance. At the same time, it has strong practicability and solves the problem that the current premixer 10 needs to be additionally equipped with a threaded adapter for connecting to the gas valve.

[0034] Specifically, the premixer 10 includes a body 11 and an air conditioning component 12 installed on the body 11. The body 11 includes an outer tube 110 and an inner tube 111 sleeved inside the outer tube 110. A gas interface 112 is provided on the side of the outer tube 110. A number of gas guiding ports 113 are provided on the inner wall of the inner tube 111, and the gas guiding ports 113 are evenly distributed. A gas inlet passage communicating with the gas interface 112 is formed among the inner wall of the outer tube 110, the outer wall of the inner tube 111, and the gas guiding ports 113. The inner tube 111 is provided with a premixing chamber communicating with the air conditioning component 12, and the premixing chamber communicates with the gas inlet passage. It can be understood that in Figure 4 , Figure 5 and Figure 7 , the outer tube 110 has a closed end and an open end. One outer end of the inner tube 111 is connected to one inner end of the outer tube 110 to form the closed end of the outer tube 110. The air conditioning component 12 abuts against the open end of the outer tube 110 and the end of the inner tube 111 respectively, and is partially staggered with the gas guiding ports 113, so that the gas flows into the premixing chamber through the gas inlet passage and mixes with the air.

[0035] In one embodiment, the gas guiding ports 113 are arranged from large to small along the gas flow direction, so that the gas can be smoothly introduced into the premixing chamber. In other embodiments, a side adjustment port 114 communicating with the gas interface 112 is further provided on the side of the outer tube 110. The gas interface 112 is connected to the gas ratio valve 40 through a connecting pipe with movable nuts at both ends. The side adjustment port 114 is provided with a gas inlet adjustment nut 115, and the intake air volume of the gas interface 112 is adjusted by adjusting the position of the gas inlet adjustment nut 115 in the side adjustment port 114. In other embodiments, the air volume can also be matched through a choke ring. In some other embodiments, a flat adjustment port is provided on the outer end face of the gas inlet adjustment nut 115. In other embodiments, other adjustment ports, such as cross-shaped or internal hexagonal, can also be provided on the outer end face of the gas inlet adjustment nut 115, so that the gas inlet adjustment nut 115 can be screwed into the inner cavity of the gas interface 112 through a screwdriver to achieve a small amount of adjustment effect.

[0036] In this embodiment, an installation flange 116 is further provided at the end of the outer tube 110 for cooperating with the fan 30 for installation. A number of installation holes are provided on the installation flange 116, and the installation holes are evenly distributed. A number of fastening ports 117 are further provided on the side of the outer tube 110 to cooperate with the installation of the intake joint 120. The inner tube 111 is generally arranged from large to small along the gas flow direction, so that the gas and air can be evenly mixed in the premixing chamber.

[0037] Such as Figure 3 and Figure 7As shown in the figure, the air conditioning component 12 includes an air inlet connector 120, an adjusting spring 121 disposed within the air inlet connector 120, an air intake adjusting member 122, and a fixed bushing 123. The air inlet connector 120 is provided with a gas guiding portion 124 communicating with the premixing chamber. The opposite ends of the air intake adjusting member 122 are provided with a first guiding rod and a second guiding rod. One end of the first guiding rod is sleeved within the gas guiding portion 124, and one end of the second guiding rod is sleeved within the fixed bushing 123. The adjusting spring 121 is disposed between the air intake adjusting member 122 and the gas guiding portion 124, and the adjusting spring 121 is sleeved within the first guiding rod, such that there is an air intake gap between the air intake adjusting member 122 and the gas guiding portion 124. The outer end of the fixed bushing 123 is provided with an air intake adjusting nut 125 abutting against the second guiding rod. By adjusting the position of the air intake adjusting nut 125 on the fixed bushing 123, the adjusting spring 121 is compressed to adjust the air intake gap between the air intake adjusting member 122 and the gas guiding portion 124, so as to correspondingly adjust the air intake volume, making the mixing ratio of air and gas reach the optimal value. It is possible to adjust an appropriate mixing ratio according to different power models, thereby improving the applicability of the premixer 10 and having relatively high versatility. Among them, the gas guiding portion 124 is provided with a receiving cavity for receiving the adjusting spring 121 to improve the stability of the adjusting spring 121. Devices such as the air intake adjusting member 122 and the fixed bushing 123 are each provided with a vent hole and an auxiliary fixing member. The air intake adjusting member 122 is positioned by the auxiliary fixing member, and then air is introduced through the vent hole.

[0038] In one embodiment, the outer end face of the air intake adjusting nut 125 is provided with a flat adjusting opening. In other embodiments, other adjusting openings, such as a cross-shaped or internal hexagonal opening, may also be provided on the outer end face of the air intake adjusting nut 125, such that the air intake adjusting nut 125 can be screwed into the inner cavity of the fixed bushing 123 by a screwdriver to achieve a small amount of adjustment effect. In some other embodiments, the air inlet connector 120 is provided with a plurality of clamping blocks 126. During installation, the clamping blocks 126 are clamped on the fastening opening 117, such that the air inlet connector 120 is tightly connected to the outer tube 110, and the gas guiding portion 124 abuts against the inner tube 111.

[0039] In this embodiment, the gas guiding portion 124 is provided with a gas guiding opening that gradually narrows, and the air intake adjusting member 122 is provided with a sealing slope surface adapted to the gas guiding opening, such that the cooperation between the air intake adjusting member 122 and the gas guiding portion 124 is better, facilitating better adjustment of the air intake condition.

[0040] In other embodiments, the air inlet connector 120 is further provided with a sealing end face. An O-ring 127 is provided at the connection between the sealing end face and the outer tube 110 of the device main body 11. The connection between the air inlet connector 120 and the device main body 11 is further sealed by the O-ring 127 to prevent air leakage.

[0041] Each of the technical features described in the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0042] The above-described embodiments only express several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A premixer, characterized in that, Comprising an appliance main body and an air conditioning assembly mounted on the appliance main body, the appliance main body includes an outer tube and an inner tube sleeved inside the outer tube. A gas interface is provided on the side of the outer tube, and a plurality of gas guiding ports are provided on the inner wall of the inner tube. A gas intake passage communicating with the gas interface is formed among the inner wall of the outer tube, the outer wall of the inner tube, and the gas guiding ports. The inner tube is provided with a premixing chamber which communicates with the gas intake passage; the air conditioning assembly includes an air intake joint, a regulating spring arranged inside the air intake joint, an air intake regulating member, and a fixed shaft sleeve. A gas guiding portion communicating with the premixing chamber is provided inside the air intake joint. The opposite ends of the air intake regulating member are provided with a first guiding rod and a second guiding rod. One end of the first guiding rod is sleeved inside the gas guiding portion, and one end of the second guiding rod is sleeved inside the fixed shaft sleeve. The regulating spring is arranged between the air intake regulating member and the gas guiding portion and is sleeved inside the first guiding rod. An air intake regulating nut abutting against the second guiding rod is provided at the outer end of the fixed shaft sleeve for adjusting the air intake gap between the air intake regulating member and the gas guiding portion.

2. The premixer according to claim 1, characterized in that The gas guiding ports are arranged from large to small along the gas flow direction.

3. The premixer according to claim 1, wherein, A side regulating port communicating with the gas interface is further provided on the side of the outer tube, and a gas intake regulating nut is provided on the side regulating port for adjusting the intake volume of the gas interface.

4. The premixer according to claim 3, characterized in that, An installation flange is further provided at the end of the outer tube, and a plurality of installation holes are provided on the installation flange, and the installation holes are evenly distributed.

5. The premixer according to claim 1, characterized in that, A plurality of buckling ports are provided on the side of the outer tube, and a plurality of clamping blocks are provided on the air intake joint, and the clamping blocks are clamped on the buckling ports.

6. The premixer according to claim 1, characterized in that The inner tube is arranged from large to small along the gas flow direction.

7. The premixer according to claim 1, characterized in that, The gas guiding portion is provided with a gas guiding port that gradually narrows.

8. The premixer according to claim 7, characterized in that, The air intake regulating member is provided with a sealing slope surface adapted to the gas guiding port.

9. The premixer according to claim 1, wherein The air intake joint is further provided with a sealing end surface, and an O-ring seal is provided at the junction of the sealing end surface and the outer tube.

10. A fully premixed gas heating and hot water boiler, characterized in that, Comprising a premixer according to any one of claims 1-9.

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