Fuel gas ejector and combustor

Abstract

The utility model discloses a fuel gas ejector and a burner, the fuel gas ejector comprises an ejector main body, a fuel gas inlet, a fuel gas outlet, a fuel gas inlet and a fuel gas outlet, the ejector main body is internally provided with a fuel gas channel in a penetrating manner; and the air injection guide piece is arranged at one end of the ejector main body, and the diameter of the air injection guide piece is gradually reduced in the direction away from the ejector main body. According to the fuel gas ejector provided by the utility model, when the fuel gas ejector ejects fuel gas, as the diameter of the air ejection guide piece is gradually reduced, compared with an air ejection guide piece with the same diameter, the fuel gas ejection speed is higher, more air is ejected, and the primary air ejection capability is better; the fuel gas ejector can guarantee the fuel gas ejection speed to the maximum extent and improve the air ejection capacity to the maximum extent, has positive and obvious effects on the combustion working condition and the heat efficiency index, and is simple in overall structure.

Description

Technical Field

[0001] This utility model relates to the field of gas ejector technology, and in particular to a gas ejector and burner. Background Technology

[0002] The national standard GB 16410-2020, "Household Gas Stoves," sets clear and mandatory requirements for CO concentration and thermal efficiency in the dry flue gas of gas stoves. As is well known, the CO emissions and thermal efficiency of gas stoves are closely related to their combustion method. Generally, addressing the CO emission concentration and thermal efficiency of naturally drafted gas stoves involves, but is not limited to, the following aspects: the ejector's ability to eject gas, the mixing capacity of the burner's gas and air, the secondary air supply capacity, and the flue gas emission capacity.

[0003] With the diversification of cooking methods and users' pursuit of the ultimate cooking experience, greater instantaneous heat is required. To ensure that gas stoves achieve greater heat load and guarantee thermal efficiency, systematic research and design of gas stoves are necessary. Design experiments have revealed that the ejection capacity of the gas ejector is fundamental. The ejection capacity of traditional cylindrical gas ejectors is often insufficient to meet the higher standards for CO emissions and thermal efficiency of gas stoves. Therefore, there is room for innovation and improvement in how to address the CO emission and thermal efficiency issues of current traditional cylindrical gas ejectors under high-performance design requirements. Utility Model Content

[0004] Therefore, the purpose of this utility model is to at least partially address the shortcomings of the prior art, thereby proposing a gas ejector and burner.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a gas ejector, comprising: an ejector body, wherein a gas passage is provided through the ejector body;

[0007] An air ejector guide is disposed at one end of the ejector body, and the diameter of the air ejector guide gradually decreases in the direction away from the ejector body.

[0008] Furthermore, the outer wall surface of the air ejector guide has an outward arc-shaped structure.

[0009] Furthermore, the projection of the outer wall surface of the air ejector guide onto the plane is linear.

[0010] Furthermore, the air ejector guide includes an ejector retraction section and a guide section connected to each other. The ejector retraction section is cylindrical, and the guide section is conical. The length of the ejector retraction section is 1-5 mm, and the diameter is 2-5 mm.

[0011] Furthermore, the diameter of the end of the guide near the ejector retraction part is the same as the diameter of the ejector retraction part, and the outer walls of the ejector retraction part and the guide part are smoothly transitioned to form an arc surface.

[0012] Furthermore, the diameter of the guide portion near the ejector retraction portion is larger than the diameter of the ejector retraction portion, forming a step between them.

[0013] Furthermore, the guide portion is a cone shape with an inner curvature.

[0014] Furthermore, the diameter of the end of the guide near the ejector retraction part is the same as the diameter of the ejector retraction part, and the ejector retraction part and the guide part are set at a right angle without a smooth transition.

[0015] Furthermore, the air ejector guide is provided with an ejector hole at its end, which is connected to the gas passage; the ejector body is also provided with an external thread, a limiting structure and a limiting groove, and is fitted with an elastic element. A retaining spring is connected in the limiting groove, and a damper plate is connected between the retaining spring and the elastic element. The two ends of the elastic element abut against the limiting structure and the damper plate, respectively; the ejector body is cylindrical, and the length of the ejector body ranges from 15-35mm, and the diameter ranges from 3-10mm.

[0016] This utility model also provides a burner, including a burner head ejector tube and a gas ejector as described in any of the above claims. The gas ejector includes an air ejector guide, one end of which is provided with an ejector hole and is disposed inside the burner head ejector tube; and the distance h from which the air ejector guide extends into the burner head ejector tube is 2-8 mm.

[0017] This invention provides a gas ejector and a burner. The gas ejector includes: an ejector body with a gas passage extending through it; and an air ejector guide at one end of the ejector body, the diameter of which gradually decreases away from the ejector body. With this gas ejector, when gas is injected, the gradually decreasing diameter of the air ejector guide results in a faster gas ejection speed and a greater amount of ejected air compared to an air ejector guide of the same diameter. This leads to better single-stage air ejection capability, maximizing the gas ejection speed and enhancing the air ejection capacity. This has a positive and significant effect on combustion conditions and thermal efficiency, and the overall structure of the gas ejector is simple. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the overall structure of the first embodiment of the gas ejector of this utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of the second embodiment of the gas ejector of this utility model;

[0021] Figure 3 This is a cross-sectional view of the overall structure of the third embodiment of the gas ejector of this utility model;

[0022] Figure 4 This is a cross-sectional view of the overall structure of the fourth embodiment of the gas ejector of this utility model;

[0023] Figure 5 This is a cross-sectional view of the overall structure of the fifth embodiment of the gas ejector of this utility model;

[0024] Figure 6 This is a diagram illustrating the working process of the burner of this utility model.

[0025] The reference numerals in the figure are as follows: 1. Ejector body; 11. External thread; 12. Limiting structure; 13. Limiting groove; 2. Gas passage; 3. Air ejector guide; 31. Ejector retraction part; 32. Guide part; 4. Ejector hole; 5. Elastic part; 6. Damper plate; 7. Snap ring; 8. Furnace head ejector tube. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] Example 1

[0029] Please refer to Figure 1 This utility model provides a gas ejector, comprising:

[0030] Ejector body 1, with a gas passage 2 running through it;

[0031] An air ejector guide 3 is disposed at one end of the ejector body 1, and the diameter of the air ejector guide 3 gradually decreases in the direction away from the ejector body 1.

[0032] In this embodiment, the gas ejector includes an ejector body 1 and an air ejector guide 3. The air ejector guide 3 is disposed at one end of the ejector body 1, while the other end of the ejector body 1 is used for assembly with a valve body. A gas passage 2 is disposed through the ejector body 1, that is, it is disposed through the air ejector guide 3, allowing gas to be ejected from the air ejector guide 3.

[0033] Specifically, because the diameter of the air ejector guide 3 gradually decreases—that is, one end of the ejector body 1 is used for assembly, and the other end is provided with the air ejector guide 3—the air ejector guide 3 gradually decreases in size along the direction away from the end of the ejector body 1 used for assembly, forming a contracting structure. Due to the reduced diameter of the air ejector guide 3, for air ejector guides 3 of the same diameter, the air ejector guide 3 with a contracting structure in this embodiment can maximize the gas injection velocity and enhance the ability to eject air, resulting in a positive and significant effect on combustion conditions and thermal efficiency indicators.

[0034] Furthermore, the outer wall of the air ejector guide 3 is set in an outward arc shape.

[0035] In this embodiment, the shape of the air ejector guide 3 has a guiding function, ensuring that the ejected air can flow along the outer wall of the air ejector guide 3, further reducing the resistance of the surrounding air ejection. The air ejector guide 3 can inject combustion gas into the burner, while its outer wall can guide air into the burner. Through the mixing of combustion gas and air, the mixture reaches the burner for ignition and combustion.

[0036] Specifically, the outer arc-shaped outer wall of the air ejector guide 3 helps guide and optimize the distribution of airflow within the burner, enabling air and fuel to mix more evenly, creating better conditions for combustion, and thus improving combustion efficiency.

[0037] Furthermore, the air ejector guide 3 is provided with an ejector hole 4 at its end, which is connected to the gas passage 2; the ejector body 1 is also provided with an external thread 11, a limiting structure 12 and a limiting groove 13, and is fitted with an elastic element 5. A retaining spring 7 is connected in the limiting groove 13, and a damper plate 6 is connected between the retaining spring 7 and the elastic element 5. The two ends of the elastic element 5 abut against the limiting structure 12 and the damper plate 6 respectively; the ejector body 1 is cylindrical, and the length of the ejector body 1 is in the range of 15-35mm, and the diameter is in the range of 3-10mm.

[0038] In this embodiment, the air ejector guide 3 has an ejector hole 4 at its end away from the ejector body 1. The ejector hole 4 is connected to the gas passage 2. The gas passes through the gas passage 2 and is injected into the burner through the ejector hole 4 on the air ejector guide 3. The external thread 11 and the limiting structure 12 of the ejector body 1 are used for the installation and removal of the ejector body 1. A retaining spring 7 is engaged in the limiting groove 13. The retaining spring 7 and the elastic element 5 sleeved on the ejector body 1 are used together to fix the damper plate 6. The two ends of the elastic element 5 abut against the limiting structure 12 and the damper plate 6, respectively. In this embodiment, the elastic element 5 is specifically a tower-shaped spring, with its smaller end abutting against the end of the limiting structure 12 and its larger end abutting against the damper plate 6. In this embodiment, the limiting structure 12 is specifically a limiting hexagonal head structure. It can be seen that the overall structure of the ejector body 1 in this embodiment is simple, has good functional expandability, can adapt to existing valve body and ejector tube structures, and has strong versatility.

[0039] The ejector body 1 is cylindrical in shape, which can maximize the transfer of gas. The length of the ejector body 1 ranges from 15 to 35 mm, and the diameter ranges from 3 to 10 mm. In this embodiment, the specific length is 25 mm and the diameter is 8 mm, which can better facilitate the mixing of air and gas.

[0040] Example 2

[0041] Please refer to Figure 2 The projection of the outer wall surface of the air ejector guide 3 onto the plane is a straight line.

[0042] In this embodiment, the projection of the outer wall surface of the air ejector guide 3 onto the plane is a straight line, that is, the cross-section of the outer wall surface of the air ejector guide 3 is straight, which can reduce air resistance.

[0043] In this embodiment, only the outer wall of the air ejector guide 3 is different from that in embodiment 1; all other aspects are the same.

[0044] Example 3

[0045] Please refer to Figure 3 The air ejector guide 3 includes an ejector retraction part 31 and a guide part 32 connected to each other. The ejector retraction part 31 is a cylinder and the guide part 32 is a cone. The length of the ejector retraction part 31 is 1-5mm and the diameter is 2-5mm.

[0046] In this embodiment, the air ejector guide 3 includes an ejector contraction portion 31 and a guide portion 32. The ejector contraction portion 31 and the guide portion 32 are connected to each other. The ejector contraction portion 31 is a cylinder, and the guide portion 32 is a cone. The cone has the function of cone-shaped guidance, which can ensure that the ejected air flows along the cone-shaped guide portion 32, further reducing the resistance of the surrounding air ejection. By combining the structures of the ejector contraction portion 31 and the guide portion 32, not only can the gas ejection speed be guaranteed, but the ability to eject air can also be improved.

[0047] The ejector constriction section 31 has a length of 1-5mm and a diameter of 2-5mm. In this embodiment, the length is 2mm and the diameter is 3mm. This allows the gas ejected from the ejector constriction section 31 to mix more fully, evenly, and thoroughly with the swirling air, resulting in a better mixing effect.

[0048] Furthermore, the diameter of the end of the guide portion 32 near the ejector retraction portion 31 is the same as the diameter of the ejector retraction portion 31, and the two smoothly transition to form an arc surface.

[0049] In this embodiment, the diameter of the ejector contraction part 31 is the same as the diameter of one end of the guide part 32 connected to it, and the outer walls of both are smoothly transitioned to form an arc surface, which can reduce the ejection resistance and allow air to be ejected better.

[0050] In this embodiment, only the air ejector guide 3 is different from that in embodiment 1; all other components are the same.

[0051] Example 4

[0052] Please see Figure 4The diameter of the guide portion 32 near the ejector contraction portion 31 is larger than the diameter of the ejector contraction portion 31, and the two form a step.

[0053] In this embodiment, the diameter of the end of the guide portion 32 near the ejector contraction portion 31 is larger than the diameter of the ejector contraction portion 31, so that a step can be formed between the two. By designing the stepped air ejector guide 3, the air is accelerated when passing through the step, the kinetic energy is increased and the pressure is reduced, so that it can achieve the effect of high-speed ejection, thereby ejecting more air and improving the air ejection capability.

[0054] In this embodiment, only the specific shapes of the guide portion 32 and the ejector retraction portion 31 in the air ejector guide 3 are different from those in embodiment 3; all other aspects are the same.

[0055] Example 5

[0056] Please see Figure 5 The guide part 32 is a cone with an inner curvature.

[0057] In this embodiment, the guide portion 32, with its conical shape and inner curvature, can form a stable jet, maintaining the stability of the ejection process and enabling air to be continuously and uniformly ejected. Simultaneously, the stable jet helps reduce energy loss during fluid flow, further improving ejection efficiency. The outer wall surface of the guide portion 23, projected onto the horizontal plane, is an arc surface with an inner curvature.

[0058] In this embodiment, only the shape of the guide portion 32 in the air ejector guide 3 is different from that in embodiment 3; all other aspects are the same.

[0059] Example 6

[0060] Specifically, the diameter of the end of the guide portion 32 near the ejector retraction portion 31 is the same as the diameter of the ejector retraction portion 31, and the ejector retraction portion 31 and the guide portion 32 are arranged at right angles without a smooth transition.

[0061] In this embodiment, the diameters of the guide portion 32 and the ejector retraction portion 31 are the same, and they are arranged in a straight line, so that there is no smooth transition at the point where they meet. This design can reduce the energy loss of the fluid during the flow process, and enable the fluid to use its energy more effectively for ejection.

[0062] In this embodiment, only the shape of the air ejector guide 3 is different from that in embodiment 3; all other aspects are the same.

[0063] Further, please refer to Figure 6This application also provides a burner, including a burner head ejector tube 8 and a gas ejector of any of the above. The gas ejector includes an air ejector guide 3, one end of which is provided with an ejector hole 4 and is disposed inside the burner head ejector tube 8; and the distance h from which the air ejector guide 3 extends into the burner head ejector tube 8 is 2-8 mm.

[0064] In this embodiment, the burner includes a burner head ejector tube 8 and a gas ejector. The gas ejector injects gas into the burner head ejector tube 8 through the ejector hole 4 of the air ejector guide 3, and the outer wall of the air ejector guide 3 can eject air into the burner head ejector tube 8. The air and gas in the burner head ejector tube 8 are mixed, and then the mixture is ignited and burned.

[0065] In existing burners, the air ejector guide 3 does not extend into the burner head ejector tube 8 but is positioned outside of it, maintaining a certain distance. This results in insufficient air intake, a low primary air coefficient, incomplete combustion of the gas in the burner, excessive CO emissions in the flue gas, environmental pollution, and reduced burner efficiency. In contrast, in this embodiment, the air ejector guide 3 is inserted into the burner head ejector tube 8, allowing both air and gas to enter. This results in a more uniform, thorough, and complete mixing of air and gas, maximizing air ejection capacity, improving combustion stability, reducing CO emissions, and increasing thermal efficiency.

[0066] The distance h extending into the furnace head ejector tube 8 is 2-8 mm, specifically 4 mm in this embodiment.

[0067] This invention provides a gas ejector and a burner. The gas ejector includes: an ejector body with a gas passage extending through it; and an air ejector guide at one end of the ejector body, the diameter of which gradually decreases away from the ejector body. With this gas ejector, when gas is injected, the gradually decreasing diameter of the air ejector guide results in a faster gas ejection speed and a greater amount of ejected air compared to an air ejector guide of the same diameter. This leads to better single-stage air ejection capability, maximizing the gas ejection speed and enhancing the air ejection capacity. This has a positive and significant effect on combustion conditions and thermal efficiency, and the overall structure of the gas ejector is simple.

[0068] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas ejector, characterized in that, include: The ejector body has a gas passage running through it. An air ejector guide is disposed at one end of the ejector body, and the diameter of the air ejector guide gradually decreases in the direction away from the ejector body.

2. The gas ejector according to claim 1, characterized in that, The outer wall of the air ejector guide has an outward arc-shaped structure.

3. The gas ejector according to claim 1, characterized in that, The projection of the outer wall surface of the air ejector guide onto the plane is a straight line.

4. The gas ejector according to claim 1, characterized in that, The air ejector guide includes an ejector retraction section and a guide section connected to each other. The ejector retraction section is cylindrical, and the guide section is conical. The length of the ejector retraction section is 1-5 mm, and the diameter is 2-5 mm.

5. The gas ejector according to claim 4, characterized in that, The diameter of the guide portion near the ejector retraction portion is the same as the diameter of the ejector retraction portion, and the two smoothly transition to form an arc surface.

6. The gas ejector according to claim 4, characterized in that, The diameter of the guide portion near the ejector retraction portion is larger than the diameter of the ejector retraction portion, and the two form a step.

7. The gas ejector according to claim 4, characterized in that, The guide portion is a cone shape with an inner curvature.

8. The gas ejector according to claim 4, characterized in that, The diameter of the end of the guide portion near the ejector retraction portion is the same as the diameter of the ejector retraction portion, and the ejector retraction portion and the guide portion are set at a right angle without a smooth transition.

9. The gas ejector according to any one of claims 2-8, characterized in that, The air ejector guide is further provided with an ejector hole at its end, which is connected to the gas passage; the ejector body is also provided with an external thread, a limiting structure and a limiting groove, and is fitted with an elastic element. A retaining spring is connected in the limiting groove, and a damper plate is connected between the retaining spring and the elastic element. The two ends of the elastic element abut against the limiting structure and the damper plate respectively; the ejector body is cylindrical, and the length of the ejector body ranges from 15-35mm, and the diameter ranges from 3-10mm.

10. A burner, characterized in that, The invention includes a burner head ejector tube and a gas ejector according to any one of claims 1-9, wherein the gas ejector includes an air ejector guide, one end of which is provided with an ejector hole is disposed inside the burner head ejector tube; and the distance h from which the air ejector guide extends into the burner head ejector tube is 2-8 mm.

Images