Premixer with sufficient mixing function and energy-saving and environment-friendly water heater

Abstract

The utility model discloses a full-mixing premixer and an energy-saving and environment-friendly water heater. The premixer comprises a premixing main body, a premixing pipe and a flow dispersing assembly, the premixing pipe is provided with a first premixing cavity, a plurality of vent holes, a first annular abutting part and a second annular abutting part, the first annular abutting part, the second annular abutting part and the premixing body define an annular gas cavity, and the annular gas cavity communicates with the first premixing cavity through the vent holes; the flow diffusing assembly comprises a flow diffusing arch plate and a flow diffusing base, and a second premixing cavity is formed among the flow diffusing arch plate, the inner wall of the premixing main body, the second annular abutting part and the flow diffusing base; and a third pre-mixing cavity communicated with the second pre-mixing cavity is formed in the flow dispersing base. According to the premixer, the first premixing cavity, the second premixing cavity and the third premixing cavity are formed by arranging the premixing main body, the premixing pipe, the flow diffusing assembly and other accessories, so that air and fuel gas can be fully mixed after being premixed for multiple times, and the problem that combustion is unstable due to insufficient mixing is solved.

Description

Technical Field

[0001] This utility model relates to the field of premixer technology, specifically to a well-mixed premixer and an energy-saving and environmentally friendly hot water boiler. Background Technology

[0002] A fully premixed gas-fired heating and hot water boiler uses a fan to create negative pressure within a premixer before combustion, drawing air from inside the boiler into the premixer. Simultaneously, a gas proportioning valve opens, allowing gas to enter the premixer, thus achieving complete premixing of gas and air in the correct proportions. Because combustion is not limited by mixing time or space, fully premixed gas-fired heating and hot water boilers offer advantages such as fast combustion speed, complete combustion, low nitrogen oxide emissions, and low noise, leading to their increasing use, especially in condensing water heaters and condensing boilers.

[0003] Existing premixers have the following drawbacks: the mixing ratio of gas and air is unreasonable, resulting in unsuccessful ignition, loud ignition noise, and incomplete combustion. Especially when operating under low load or low load conditions, they are prone to flameout or ignition deflagration, leading to unstable combustion.

[0004] In the prior art, a premixer is disclosed, which includes a housing, an air passage, and an adjusting rod. The adjusting rod is arranged in the air passage, and the air flow area of ​​the air passage is adjusted by adjusting the adjusting rod to adjust the air volume to a suitable level, so as to ensure that the mixing ratio of gas and air reaches the optimal state, improve the stability and adaptability of combustion, and enable its heat load and combustion stability to meet the design requirements. However, in the above-mentioned technology, since the gas inlet is located at the bottom, the gas is drawn into the premixing chamber by the negative pressure in the form of air. The air and gas cannot achieve a good premixing effect in the premixing chamber, which leads to the problem of unstable combustion due to poor premixing effect. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a premixer that mixes thoroughly and solves the aforementioned traditional problems.

[0006] The second objective of this utility model is to provide an energy-saving and environmentally friendly hot water boiler that uses this fully mixed premixer.

[0007] One of the objectives of this utility model is achieved through the following technical solution:

[0008] A premixer for thorough mixing includes a premixing body, a premixing pipe mounted on the premixing body, and a diffuser assembly. The premixing body has a gas inlet on its side. The premixing pipe has a first premixing chamber, multiple vent holes, a first annular abutment portion, and a second annular abutment portion. The first annular abutment portion, the second annular abutment portion, and the inner wall of the premixing body form an annular gas cavity communicating with the gas inlet. The annular gas cavity communicates with the first premixing chamber through the vent holes. The diffuser assembly includes a diffuser arch and a diffuser base. The diffuser arch, the inner wall of the premixing body, the second annular abutment portion, and the diffuser base form a second premixing chamber communicating with the first premixing chamber. The diffuser base has a third premixing chamber, which communicates with the second premixing chamber.

[0009] Preferably, the front end of the premixed body is provided with an annular air inlet and an air guide section, and the air guide section is gradually reduced in size.

[0010] Preferably, the vent holes are arranged in a staggered and uniform manner, and the diameter of the vent holes is 0.06-0.12 times the inner diameter of the first premixing chamber.

[0011] Preferably, the number of vent holes is two rows, and the adjacent vent holes form a triangular arrangement structure. In the same row, the distance between adjacent vent holes is 8-11mm, and between two adjacent rows, the distance between adjacent vent holes is 4-7mm.

[0012] Preferably, the first annular abutment portion is provided with a first sealing groove for installing a first sealing ring, the second annular abutment portion is provided with a second sealing groove for installing a second sealing ring, and the diffuser base is provided with a third sealing groove for installing a third sealing ring.

[0013] Preferably, the premixed body is provided with a plurality of snap-fit ​​grooves, and the premixed tube is provided with a plurality of snap-fit ​​posts, the snap-fit ​​posts being used to snap onto the snap-fit ​​grooves.

[0014] Preferably, the diffuser arch plate has an arched part and a supporting part. The arched part is convex outward on the side facing the first premixing chamber. The supporting part is composed of multiple supporting rods. The diffuser base has several mounting holes, and each supporting rod is adapted to each mounting hole.

[0015] Preferably, the first premixing chamber has a first air inlet that gradually increases in size at its outlet, the third premixing chamber has a second air inlet that gradually decreases in size at its inlet, and the third premixing chamber has a third air inlet that gradually increases in size at its outlet.

[0016] Preferably, the premixed body has a receiving groove at its rear end, and the diffuser base has a receiving plate, which is used to receive the receiving groove.

[0017] The second objective of this utility model is achieved by the following technical solution:

[0018] An energy-saving and environmentally friendly hot water boiler includes the aforementioned premixer for thorough mixing.

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

[0020] The premixer of this invention forms a first premix chamber, a second premix chamber, and a third premix chamber by setting up a premixing body, a premixing pipe, and a diffuser assembly, so that air and fuel gas can be fully mixed after multiple premixing processes, thereby solving the problem of unstable combustion caused by insufficient mixing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the premixer of this utility model;

[0022] Figure 2 for Figure 1 An exploded view of the premixer shown;

[0023] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the premixer.

[0024] In the figure: 10, premixing body; 11, gas inlet; 20, premixing pipe; 21, first premixing chamber; 22, vent hole; 23, first annular contact part; 24, second annular contact part; 30, diffuser assembly; 31, diffuser arch plate; 32, diffuser base; 33, second premixing chamber; 34, third premixing chamber. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0028] Please see Figures 1-3 This invention provides a preferred embodiment of a premixer for thorough mixing, used in a gas-fired heating and hot water boiler to ensure sufficient premixing of air and gas for more stable combustion. Specifically, the premixer includes a premixing body 10, a premixing pipe 20 mounted on the premixing body 10, and a diffuser assembly 30. The premixing body 10 has a gas inlet 11 on its side. The premixing pipe 20 has a first premixing chamber 21, multiple vent holes 22, a first annular abutment portion 23, and a second annular abutment portion 24. The first annular abutment portion 23, the second annular abutment portion 24, and the inner wall of the premixing body 10 form an annular gas cavity communicating with the gas inlet 11. The annular gas cavity is connected by a gas inlet 11. The vent 22 is connected to the first premixing chamber 21, so that the gas and air are premixed for the first time in the first premixing chamber 21. The diffuser assembly 30 includes a diffuser arch plate 31 and a diffuser base 32. The diffuser arch plate 31 forms a second premixing chamber 33 connected to the first premixing chamber 21 between the inner wall of the premixing body 10, the second annular contact part 24, and the diffuser base 32. The gas and air are premixed for the second time in the second premixing chamber 33. The diffuser base 32 is provided with a third premixing chamber 34. The third premixing chamber 34 is connected to the second premixing chamber 33. The gas and air are premixed for the third time in the third premixing chamber 34, so that the gas and air can be fully mixed in the premixer.

[0029] The aforementioned premixer, by setting up a premixing body 10, a premixing pipe 20, and a diffuser assembly 30, forms a first premixing chamber 21, a second premixing chamber 33, and a third premixing chamber 34, so that air and fuel gas can be fully mixed after multiple premixing processes, thereby solving the problem of unstable combustion caused by insufficient mixing.

[0030] In this embodiment, the premixing body 10 has an annular air inlet and a guide section at its front end. The annular air inlet serves as a transition section, allowing the air entering the cavity to transition smoothly and preventing turbulence caused by surrounding air entering the premixer, which could lead to noise. The guide section is designed to gradually narrow, allowing air to enter the cavity smoothly. Optionally, a gas inlet 11 is located on one side of the premixing body 10. The gas inlet 11 is a cylindrical channel, and an annular step is provided at the inner end of the interface of the gas inlet 11. The annular step is used to install a gas flow regulating ring, which can be used to further limit the gas volume and precisely control the gas flow. The structure of the gas flow regulating ring needs to be added according to specific needs and will not be described in detail here. The outer end of the interface of the gas inlet 11 has a connecting structure, which is a threaded or snap-fit ​​fixing structure.

[0031] In one embodiment, the vents 22 are arranged in a staggered and uniform manner. The diameter of the vents 22 is 0.06-0.12 of the inner diameter of the first premixing chamber 21, such as 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, etc. In this embodiment, there are two rows of vents 22 (arranged in the direction of airflow). The vents 22 adjacent to each other form a triangular arrangement. In the same row, the distance between the left and right adjacent vents 22 is 8-11 mm, such as 8, 8.5, 9, 9.5, 10, 10.5, 11, etc. Between two adjacent rows, the distance between the front and back adjacent vents 22 is 4-7 mm, such as 4, 4.5, 5, 4.5, 6, 6.5, 7, etc. In other embodiments, the number of vent holes 22, the distance between holes, and the diameter of the holes can be set according to specific air-fuel ratio requirements, and are not limited to the number of rows, the distance between holes, and the diameter of the holes as limited by this utility model.

[0032] In another embodiment, the first annular abutment portion 23 is provided with a first sealing groove for installing a first sealing ring, and the second annular abutment portion is provided with a second sealing groove for installing a second sealing ring, thereby improving the sealing performance between the premixed tube 20 and the premixed body 10. Optionally, the premixed body 10 is provided with a plurality of snap-fit ​​grooves, and the premixed tube 20 is provided with a plurality of snap-fit ​​posts, which are used to snap onto the snap-fit ​​grooves for further installation and fixation of the premixed tube 20.

[0033] In one embodiment, the diffuser arch 31 has an arched portion and a supporting portion. The arched portion facing the first premixing chamber 21 protrudes outward, forming an umbrella-shaped structure. This allows the mixed gas to disperse to both sides when flowing over the surface of the arched portion, facilitating airflow buffering and enabling gas remixing. The supporting portion consists of multiple supporting rods, and the diffuser base 32 has several mounting holes. Each supporting rod is matched with a mounting hole, allowing the diffuser arch 31 to be fixedly installed on the diffuser base 32. Gas also flows through the gaps between the supporting rods. Both can be further fixed using an interference fit or by applying a fixing adhesive. In this embodiment, the inner diameter of the third premixing chamber 34 is equal to the inner diameter of the first premixing chamber 21. The outlet of the first premixing chamber 21 has a first air guide port that gradually increases in size, the inlet of the third premixing chamber 34 has a second air guide port that gradually decreases in size, and the outlet of the third premixing chamber 34 has a third air guide port that gradually increases in size, allowing gas to flow in and out smoothly. Optionally, the diffuser base 32 is provided with a third sealing groove for installing the third sealing ring to improve the installation performance of the diffuser base 32. Furthermore, the rear end of the premix body 10 is provided with a receiving groove, and the diffuser base 32 is provided with a receiving plate for receiving in the receiving groove, so that the position of the diffuser base 32 can be fixed after the premixer is installed.

[0034] In other embodiments, the rear end of the premix body 10 is provided with a mounting flange, which has multiple sets of fixing holes, so that the premixer can be installed from different angles, thereby improving the versatility and adjustability of the premixer installation.

[0035] In other embodiments, the present invention also provides an energy-saving and environmentally friendly hot water boiler, which, by installing the premixer of the above embodiments, makes the air and gas mix more fully, improves combustion stability, and achieves better energy-saving and environmental protection effects.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A well-mixed premixer, characterized in that, The device includes a premixing body, a premixing pipe mounted on the premixing body, and a diffuser assembly. The premixing body has a gas inlet on its side. The premixing pipe has a first premixing chamber, multiple vent holes, a first annular abutment portion, and a second annular abutment portion. The first annular abutment portion, the second annular abutment portion, and the inner wall of the premixing body form an annular gas cavity that communicates with the gas inlet. The annular gas cavity communicates with the first premixing chamber through the vent holes. The diffuser assembly includes a diffuser arch plate and a diffuser base. The diffuser arch plate, the inner wall of the premixing body, the second annular abutment portion, and the diffuser base form a second premixing chamber that communicates with the first premixing chamber. The diffuser base has a third premixing chamber that communicates with the second premixing chamber.

2. The well-mixed premixer according to claim 1, characterized in that, The premixed body has an annular air inlet and an air guide section at its front end, and the air guide section is gradually reduced in size.

3. The well-mixed premixer according to claim 1, characterized in that, The ventilation holes are arranged in a staggered and uniform manner, and the diameter of the ventilation holes is 0.06-0.12 times the inner diameter of the first premixing chamber.

4. The well-mixed premixer according to claim 3, characterized in that, The ventilation holes are arranged in two rows, with adjacent ventilation holes forming a triangular arrangement. In the same row, the distance between adjacent ventilation holes is 8-11 mm, and between two adjacent rows, the distance between adjacent ventilation holes is 4-7 mm.

5. The well-mixed premixer according to claim 1, characterized in that, The first annular abutment portion is provided with a first sealing groove for installing a first sealing ring, the second annular abutment portion is provided with a second sealing groove for installing a second sealing ring, and the diffuser base is provided with a third sealing groove for installing a third sealing ring.

6. The well-mixed premixer according to claim 1, characterized in that, The premixed body is provided with several snap-fit ​​grooves, and the premixed tube is provided with several snap-fit ​​posts, which are used to snap onto the snap-fit ​​grooves.

7. The well-mixed premixer according to claim 1, characterized in that, The diffuser arch plate has an arched part and a support part. The arched part is convex outward on the side facing the first premixing chamber. The support part is composed of multiple support rods. The diffuser base has several mounting holes, and each support rod is adapted to each mounting hole.

8. The well-mixed premixer according to claim 1, characterized in that, The first premixing chamber has a first air inlet that gradually increases in size at its outlet end, the third premixing chamber has a second air inlet that gradually decreases in size at its inlet end, and the third premixing chamber has a third air inlet that gradually increases in size at its outlet end.

9. The well-mixed premixer according to claim 1, characterized in that, The premixed body has a receiving groove at its rear end, and the diffuser base has a receiving plate, which is used to receive the receiving groove.

10. An energy-saving and environmentally friendly hot water boiler, characterized in that, Includes a fully mixed premixer as described in any one of claims 1-9.

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