Ejector, ejector assembly and gas stove

Abstract

The present invention relates to the technical field of gas stoves, and specifically relates to an ejector, an ejector assembly and a gas stove. The ejector includes: a main body section and a diffuser section. The first end of the main body section is an air inlet, and the diffuser section is connected to the second end of the main body section. The nozzle orifice is adapted to enter the main body section through the air inlet. The area of the second end of the main body section is S1, and the area of the orifice is S2, where 72 ≤ S1 / S2 ≤ 120. Defining S1 / S2 as the throat-nozzle ratio, through experimental simulation, when the throat-nozzle ratio is too small, the jet airflow cannot completely pass through the throat position, resulting in insufficient entrained air volume and incomplete combustion. When the throat-nozzle ratio is too large, the flue gas temperature will decrease due to excessive entrained air volume. Therefore, by making the throat-nozzle ratio between 72 and 120, the thermal efficiency of the gas stove can be maintained at a relatively high value, ensuring the combustion effect.

Description

Technical Field

[0001] The present invention relates to the technical field of gas stoves, and particularly to an injector, an injection assembly and a gas stove. Background Art

[0002] The natural gas consumption of residents in China is increasing year by year. The continuous popularization of natural gas in China has also promoted the development of the gas appliance industry. As a common kitchen appliance, the gas stove makes the cooking process more convenient and fast, greatly saving the time spent by people in the cooking process. However, at present, there are still problems with gas stoves such as low thermal efficiency, high energy consumption, high CO concentration in flue gas, and unstable combustion. Considering the current situation of low thermal efficiency of household gas stoves, how to improve the thermal efficiency of gas stoves has always been a hot research topic in the field of gas stoves. At present, the inventory of gas stoves in China is approximately 3×10 8 units. Even if the thermal efficiency is only increased by 1%, nearly 9.1×10^7 m 3 of natural gas can be saved every day, which will have a significant impact on China's energy conservation work.

[0003] The injector is an indispensable and important component on the gas stove, and the injection performance of the injector directly affects the efficiency of the gas stove. The important role of the injector is manifested in two aspects: one is to transport the required gas volume of the gas stove through the injector; the other is that the injector has the function of premixing the mixed gas and can ensure that the mixed gas has a certain positive pressure to overcome the resistance loss of the gas in the injector, so that the gas has a certain speed when it reaches the burner, thereby ensuring the stability of combustion.

[0004] However, the design of the existing injector makes the thermal efficiency of the gas stove relatively low. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the injector in the prior art makes the thermal efficiency of the gas stove relatively low, so as to provide an injector and a gas stove that can improve the thermal efficiency.

[0006] To solve the above technical problem, an injector provided by the present invention includes: a main body section and a diffuser section. The first end of the main body section is an air inlet, the diffuser section is connected to the second end of the main body section, the nozzle orifice is adapted to enter the main body section through the air inlet, the area of the second end of the main body section is S1, the area of the orifice is S2, and 72≤S1 / S2≤120.

[0007] Optionally, 90≤S1 / S2≤100.

[0008] Optionally, the diffuser angle of the diffuser section is A, and 0<A≤6°.

[0009] Optionally, 1.5°≤A≤3.5°.

[0010] Optionally, the main body section includes an air inlet section and a throat section. The air inlet section and the diffuser section are respectively connected to two ends of the throat section, and the cross-sectional area of the air inlet section gradually increases along the direction away from the throat section.

[0011] Optionally, the cross-sections of the main body section and the diffuser section are both circular.

[0012] Optionally, the main body section further includes a connection section provided at one end of the air inlet section away from the throat section. In the axial direction of the ejector, the cross-sectional area of the connection section remains unchanged.

[0013] The present invention also provides an ejector assembly, including the ejector as described above and a nozzle provided at one end of the ejector. The nozzle orifice of the nozzle extends into the main body section.

[0014] The present invention also provides a gas stove, including the ejector assembly as described above.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. For the ejector provided by the present invention, from the second end of the main body section to the end of the diffuser section away from the main body section, the cross-sectional area of the diffuser section gradually increases. The second end of the main body section forms a throat. Define S1 / S2 as the throat-jet ratio. Through experimental simulation, when the throat-jet ratio is too small, the ejected air flow cannot completely pass through the throat position, resulting in insufficient entrained air and incomplete combustion. When the throat-jet ratio is too large, the flue gas temperature will decrease due to excessive entrained air. Therefore, by making the throat-jet ratio between 72 - 120, the thermal efficiency of the gas stove can be maintained at a relatively high value to ensure the combustion effect.

[0017] 2. For the ejector provided by the present invention, 90≤S1 / S2≤100, which can further improve the thermal efficiency of the gas stove.

[0018] 3. For the ejector provided by the present invention, the diffuser angle of the diffuser section is A, 0<A≤6°. If the diffuser angle is too small, the resistance at the rear end of the ejector will be too large, resulting in insufficient entrained air and incomplete combustion. If the diffuser angle is too large, since more of the air flow can be converted into pressure potential energy, the combustion cannot be guaranteed. Therefore, by making the diffuser angle within the range of 0 - 6°, the efficiency of the gas stove can be maintained at a relatively high level.

[0019] 4. For the ejector provided by the present invention, 1.5°≤A≤3.5°. By making the diffuser angle between 1.5° - 3.5°, the thermal efficiency of the gas stove can be further improved. Description of the Drawings

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings required for the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the ejector assembly provided in Embodiment 2 of the present invention.

[0022] Description of the reference numerals:

[0023] 1. Ejector; 101. Main body section; 1011. Air inlet; 1012. Air intake section; 1013. Throat section; 1014. Connection section; 102. Diffuser section; 2. Nozzle; 201. Nozzle orifice. Specific embodiments

[0024] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Embodiment 1

[0029] The ejector is an essential component on a gas stove, and the ejector performance directly affects the efficiency of the gas stove. The important functions of the ejector are manifested in two aspects: one is to transport the required gas volume for the gas stove through the ejector; the other is that the ejector has the function of premixing the mixed gas and can ensure that the mixed gas has a certain positive pressure to overcome the resistance loss of the gas in the ejector, so that the gas has a certain speed when it reaches the burner, thereby ensuring the stability of combustion.

[0030] However, the design of the existing ejector results in a relatively low thermal efficiency of the gas stove. It should be noted that the thermal efficiency refers to the ratio of the actually utilized heat and the theoretical heat of the consumed gas during the process of heating the water in the experimental standard pot by 50°C.

[0031] Therefore, this embodiment provides an ejector 1.

[0032] In one embodiment, the ejector 1 includes a main body section 101 and a diffuser section 102. The first end of the main body section 101 is an air inlet 1011, the diffuser section 102 is connected to the second end of the main body section 101, the nozzle 201 of the nozzle 2 is adapted to enter the main body section 101 through the air inlet 1011, the area of the second end of the main body section 101 is S1, the area of the nozzle 201 is S2, and 72 ≤ S1 / S2 ≤ 120.

[0033] In this embodiment, as Figure 1 shown, from the second end of the main body section 101 to the end of the diffuser section 102 far from the main body section 101, the cross-sectional area of the diffuser section 102 gradually increases. The second end of the main body section 101 forms a throat. Define S1 / S2 as the throat-nozzle ratio. Through experimental simulation, when the throat-nozzle ratio is too small, the jet airflow cannot completely pass through the throat position, resulting in insufficient entrained air volume and incomplete combustion. When the throat-nozzle ratio is too large, the flue gas temperature will decrease due to excessive entrained air volume. Therefore, by making the throat-nozzle ratio between 72 - 120, the thermal efficiency of the gas stove can be maintained at a relatively high value and the combustion effect can be ensured.

[0034] On the basis of the above embodiment, in a preferred embodiment, 90 ≤ S1 / S2 ≤ 100. In this embodiment, the thermal efficiency of the gas stove can be further improved.

[0035] Based on the above embodiments, in a preferred embodiment, the diffuser angle of the diffuser section 102 is A, where 0 < A ≤ 6°. Specifically, the diffuser angle is the angle between the diffuser section 102 and the extension direction of the second end of the main body section 101 on the longitudinal section of the ejector 1. Through experimental simulation, if the diffuser angle is too small, it will cause excessive resistance at the rear end of the ejector 1, insufficient entrained air volume leading to incomplete combustion. If the diffuser angle is too large, since more airflow energy is converted into pressure potential energy, combustion cannot be guaranteed. Therefore, by setting the diffuser angle within the range of 0 - 6°, the efficiency of the gas stove can be maintained at a relatively high level.

[0036] In a preferred embodiment, when the throat injection ratio is within the range of 72 - 120 and the diffuser angle is within the range of 0 - 6° simultaneously, the thermal efficiency of the gas stove can be maintained above 0.60.

[0037] Based on the above embodiments, in a preferred embodiment, 1.5° ≤ A ≤ 3.5°. In this embodiment, by setting the diffuser angle between 1.5° and 3.5°, the thermal efficiency of the gas stove can be further improved.

[0038] In a preferred embodiment, when the throat injection ratio is within the range of 90 - 100 and the diffuser angle is between 1.5° and 3.5° simultaneously, the thermal efficiency of the gas stove can be maintained above 0.65.

[0039] Serial number Laryngeal spray ratio Thermal efficiency 1 36 0.385 2 42 0.422 3 49 0.502 4 56 0.538 5 64 0.591 6 72 0.601 7 81 0.636 8 90 0.664 9 100 0.684 10 110 0.632 11 121 0.616 12 132 0.584 13 144 0.573

[0040] Table 1

[0041] Table 1 shows that when the diffuser angle is 3°, the thermal efficiency is different when the throat injection ratio takes different values. It can be seen that when the throat injection ratio is between 72 - 120, the thermal efficiency can be maintained above 0.60.

[0042]

[0043]

[0044] Table 2

[0045] Table 2 shows that when the throat injection ratio is 150, the thermal efficiency is different for different diffuser angles. It can be seen that when the diffuser angle is between 1 - 3.5, the thermal efficiency is above 0.65.

[0046] On the basis of the above embodiments, in a preferred embodiment, the main body section 101 includes an intake section 1012 and a throat section 1013. The intake section 1012 and the diffuser section 102 are respectively connected to both ends of the throat section 1013. The cross-sectional area of the intake section 1012 gradually increases along the direction away from the throat section 1013. In this embodiment, by making the cross-sectional area of the intake section 1012 gradually increase along the direction away from the throat section 1013, the intake section 1012 has a larger intake area, which is conducive to air entering the main body section 101 through the air inlet 1011 and improving the thermal efficiency.

[0047] On the basis of the above embodiments, in a preferred embodiment, the cross-sections of both the main body section 101 and the diffuser section 102 are circular. In this embodiment, since the cross-sections of both the main body section 101 and the diffuser section 102 are circular, it is conducive to the flow of air and gas and reduces the resistance during the flow process. In this embodiment, combined with Figure 1 , if the diameter at the second end of the main body section 101 is d1 and the diameter at the nozzle opening 201 of the nozzle 2 is d2, then the throat-nozzle ratio is d1 2 / d2 2 . In other alternative embodiments, the cross-sections of the main body section 101 and the diffuser section 102 can be other shapes such as oval, pentagon, hexagon, etc.

[0048] On the basis of the above embodiments, in a preferred embodiment, the main body section 101 further includes a connection section 1014 provided at one end of the intake section 1012 away from the throat section 1013. In the axial direction of the ejector 1, the cross-sectional area of the connection section 1014 remains unchanged. In this embodiment, the provision of the connection section 1014 facilitates the fixed connection of the ejector 1 to other components, thereby fixing the position of the ejector 1. Specifically, the connection section 1014 is cylindrical.

[0049] Embodiment 2

[0050] This embodiment provides an ejector assembly, as Figure 1 shown, including the ejector 1 provided in the above embodiment and a nozzle 2 provided at one end of the ejector 1. The nozzle opening 201 of the nozzle 2 extends into the main body section 101.

[0051] In this embodiment, when the ejector assembly is working specifically, the gas is ejected from the nozzle opening 201 of the nozzle 2 and enters the ejector 1. The air is entrained by the high-speed gas and brought into the ejector 1 from the air inlet 1011 at the left end. Define S1 / S2 as the throat-jet ratio. Through experimental simulation, when the throat-jet ratio is too small, the jet airflow cannot completely pass through the throat position, resulting in insufficient entrained air volume and incomplete combustion. When the throat-jet ratio is too large, the flue gas temperature will decrease due to excessive entrained air volume. Therefore, by making the throat-jet ratio between 72 and 120, the thermal efficiency of the gas stove can be maintained at a relatively high value, ensuring the combustion effect.

[0052] Embodiment 3

[0053] This embodiment provides a gas stove, including the ejector assembly provided in the above embodiment. Regarding the connection relationship between the nozzle 2 and the ejector 1 and other components of the gas stove, it belongs to the technology well-known to those skilled in the art, and this embodiment will not be introduced in detail.

[0054] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An ejector, characterized in that, Comprising: A main body section (101) and a diffuser section (102), a first end of the main body section (101) being an air inlet (1011), the diffuser section (102) being connected to a second end of the main body section (101), a nozzle orifice (201) of a nozzle (2) being adapted to enter the main body section (101) through the air inlet (1011), an area of the second end of the main body section (101) being S1, an area of the nozzle orifice (201) being S2, and 72 ≤ S1 / S2 ≤ 120.

2. The ejector according to claim 1, wherein, 90 ≤ S1 / S2 ≤ 100.

3. The ejector according to claim 1 or 2, characterized in that, A diffuser angle of the diffuser section (102) is A, and 0 < A ≤ 6°.

4. The ejector according to claim 3, characterized in that, 1.5°≤A≤3.5°。 5. The ejector according to claim 1 or 2, characterized in that, The main body section (101) includes an air intake section (1012) and a throat section (1013), the air intake section (1012) and the diffuser section (102) being respectively connected to two ends of the throat section (1013), and a cross-sectional area of the air intake section (1012) gradually increasing in a direction away from the throat section (1013).

6. The ejector according to claim 5, characterized in that, Cross-sections of the main body section (101) and the diffuser section (102) are both circular.

7. The ejector according to claim 5, characterized in that, The main body section (101) further includes a connection section (1014) provided at an end of the air intake section (1012) away from the throat section (1013), and in an axial direction of the ejector (1), a cross-sectional area of the connection section (1014) remains unchanged.

8. An ejector assembly, characterized in that, Comprising the ejector (1) according to any one of claims 1 - 7 and a nozzle (2) provided at one end of the ejector (1), the nozzle orifice (201) of the nozzle (2) extending into the main body section (101).

9. A gas stove, characterized in that, Comprising the ejector assembly according to claim 8.

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