Gas mixer and gas appliance

Abstract

The utility model discloses a kind of gas mixer and gas equipment, the gas mixer includes first shell, second shell and third shell sequentially detachably connected, first shell is equipped with tangentially arranged first injection pipe for introducing gas, top is equipped with the second injection pipe with flow guide sound-absorbing strip for introducing air, flow guide sound-absorbing strip surface is equipped with spiral groove to guide airflow to form swirl and reduce noise;Second shell is equipped with columnar mixing chamber and volute type flow guide chamber, columnar mixing chamber is built-in centrifugal impeller, and gas is introduced by annular gap, and after being entered volute cavity by gas outlet, it is exported by mixed gas outlet;Third shell is built-in driving motor, drives centrifugal impeller rotation to realize forced mixing.The structure effectively improves the mixing uniformity and combustion efficiency of gas and air, while significantly reduces operating noise, suitable for gas heating hot water furnace and other efficient low-noise combustion equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel-air mixing devices, specifically a gas mixer and gas equipment. Background Technology

[0002] In existing gas-fired equipment, such as gas-fired heating and hot water boilers, the gas mixer is the core component for achieving efficient and clean combustion. However, traditional mixers generally suffer from technical bottlenecks such as uneven mixing and high operating noise. Their structure often relies on simple ejector mixing, where the mixing process between gas and air is passive and incomplete, leading to unstable combustion efficiency and high pollutant emissions. At the same time, the high-speed airflow easily generates violent turbulence and impacts when entering the ejector tube, producing unpleasant operating noise and affecting the user experience. Utility Model Content

[0003] To address the aforementioned challenges, one objective of this application is to provide a gas mixer that fundamentally optimizes the hybrid dynamics of airflow, improving mixing uniformity and combustion efficiency while effectively suppressing noise generation. This gas mixer includes: The first housing includes a first ejector tube, a second ejector tube, and a flow-guiding silencer strip. The first ejector tube is located on the circumferential sidewall of the first housing and communicates with the internal cavity of the first housing for ejecting combustion gas. The second ejector tube is located at the top of the first housing and extends axially into the internal cavity of the first housing for ejecting air. The inlet end of the second ejector tube is provided with a flow-guiding silencer strip, and both ends of the flow-guiding silencer strip are detachably fixed to the outer wall of the first housing. The flow-guiding silencer strip is a strip-shaped component that spans across and partially blocks the inlet section of the second ejector tube. The surface of the flow-guiding silencer strip is provided with a spiral groove that surrounds the main body of the flow-guiding silencer strip. The second housing has its top surface detachably connected to the bottom of the first housing. The top surface of the second housing extends upward to provide a connection interface. The upper end of the connection interface is fitted onto the outside of the second ejector tube and there is an annular gap between the connection interface and the second ejector tube, so that the gas can enter the internal cavity of the second housing from the annular gap. The lower end of the connection interface is provided with an integrally formed columnar mixing chamber. The bottom of the columnar mixing chamber has multiple gas outlets along the circumferential sidewall. The columnar mixing chamber is connected to the internal cavity of the second housing through the gas outlets. A centrifugal impeller is provided inside the columnar mixing chamber. The internal cavity of the second housing is a volute-type flow guide chamber. The circumferential sidewall of the second housing is provided with a mixed gas outlet, which is connected to the volute-type flow guide chamber. The top surface of the third housing is detachably connected to the bottom of the second housing. A drive motor is installed inside the internal cavity of the third housing. The drive motor is detachably connected to the bearing port at the top of the third housing. The output shaft of the drive motor is coaxially connected to the centrifugal impeller.

[0004] Preferably, the top surface of the second housing is provided with a positioning annular groove, and the bottom of the first housing is provided with a positioning annular protrusion. The positioning annular protrusion cooperates with the positioning annular groove, and the positioning annular groove is also provided with a sealing ring.

[0005] Preferably, the first ejector tube is arranged tangentially to the circumferential sidewall of the first housing.

[0006] Preferably, the width of the annular gap between the connection interface and the second ejector tube is between 0.5 and 5 mm.

[0007] Preferably, the inner wall of the columnar mixing chamber is provided with a spiral guide groove.

[0008] Preferably, the number of air outlets is 6-24, and they are evenly distributed on the bottom circumferential sidewall of the columnar mixing chamber.

[0009] Preferably, the cross-sectional shape of the volute-type flow guide cavity is involute.

[0010] Preferably, a flow regulating valve is provided at the outlet of the mixed gas.

[0011] Preferably, a shock-absorbing pad is provided between the drive motor and the bearing port.

[0012] Another object of this application is to provide a gas appliance, including the gas mixer described above, further comprising: The combustion chamber assembly is sealed and connected to the gas-mixture exhaust port. The ignition electrode assembly is located in the flame stabilization zone of the combustion chamber assembly; The heat exchanger assembly is located in the flue gas passage downstream of the combustion chamber.

[0013] The beneficial effects are as follows: By tangentially arranging the first ejector tube, this application enables the gas to form a swirling flow upon entering the first casing; simultaneously, the guide and silencer strips installed at the air ejector port, with their spiral grooves, can convert the vertically entering airflow into a swirling flow, achieving efficient premixing of the two gases; subsequently, the mixed gas undergoes forced stirring by the centrifugal impeller and further guidance by the spiral guide grooves on the inner wall in the columnar mixing chamber, which greatly improves the uniformity and efficiency of the gas-air mixing, laying the foundation for subsequent stable and efficient combustion; secondly, this device has excellent heat reduction... In terms of noise reduction performance, the airflow guiding and silencing strip not only guides airflow, but its unique hollow cavity structure, internal sound-absorbing cotton filling, damping rubber layer, and biomimetic fish scale microstructure on the surface can effectively absorb and weaken airflow noise. In addition, the vibration reduction design at the drive motor ensures that the device operates smoothly in a low-noise state. The noise of this device is less than 40 decibels according to the test. In summary, this application achieves efficient premixing of gas and air through structural innovation, greatly improves combustion stability, and has a significant noise reduction effect. It can be applied to various high-efficiency and low-noise combustion equipment, especially suitable for combustion water heaters. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the cross-sectional structure of this application; Figure 3 This is a schematic diagram of the exploded structure of this application; In the picture: 1. First housing; 11. First ejector tube; 12. Second ejector tube; 13. Flow guide and noise reduction strip; 131. Spiral groove; 2. Second housing; 21. Connection interface; 211. Annular slit; 22. Columnar mixing chamber; 221. Air outlet; 23. Positioning annular groove; 24. Mixed gas outlet; 3. Third housing; 31. Bearing port. Detailed Implementation

[0015] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0016] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0017] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] Example 1 Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the cross-sectional structure of this application; Figure 3 This is a schematic diagram of the exploded structure of this application. This embodiment provides a gas mixer, including a first housing 1, a second housing 2, and a third housing 3. The bottom of the first housing 1 is detachably fixed to the top surface of the second housing 2 by bolts, and the bottom of the second housing 2 is detachably fixed to the top surface of the third housing 3 by bolts. The top surface of the second housing 2 is provided with a positioning annular groove 23, and the bottom of the first housing 1 is provided with a positioning annular protrusion. The positioning annular protrusion is embedded in the positioning annular groove 23 to achieve precise positioning and prevent misalignment. An O-ring is embedded in the positioning annular groove 23 to ensure the airtightness between the first housing 1 and the second housing 2 and prevent gas leakage.

[0019] See also Figure 1 and Figure 2The first housing 1 includes a first ejector tube 11, a second ejector tube 12, and a flow-guiding and silencing strip 13. The first ejector tube 11 is located on the circumferential sidewall of the first housing 1 and communicates with the internal cavity of the first housing 1, and is used to eject gas. Specifically, the first ejector tube 11 is arranged tangentially to the circumferential sidewall of the first housing 1, and the inlet end of the first ejector tube 11 is located outside the first housing 1, for connecting to the gas pipeline. Gas enters the internal cavity of the first housing 1 tangentially from the first ejector tube 11, forming a swirling flow. The swirling flow promotes the initial mixing of gas and air, improving the mixing uniformity. The second ejector tube 12 is located at the top of the first housing 1 and extends axially into the internal cavity of the first housing 1, and is used to eject air. The inlet end of the second ejector tube 12 is provided with a flow-guiding and silencing strip 13. The two ends of the flow-guiding and silencing strip 13 are fixed to the outer wall of the first housing 1 by bolts. The flow-guiding and silencing strip 13 is a strip-shaped component that spans across and partially blocks the inlet section of the second ejector tube 12, with the blocking area accounting for a certain percentage of the total area of ​​the second ejector tube 12. The shielding area should be 1 / 6 to 1 / 3 of the inlet cross-sectional area of ​​the second ejector tube 12. The shielding area should not be too large to avoid excessive shielding affecting air intake, nor too small to avoid affecting airflow dispersion and noise reduction. A preferred design is to use an arc-shaped strip structure for the flow-guiding and noise-reducing strip 13, with the bending direction protruding outwards relative to the inlet of the second ejector tube 12. The shielding effect of the flow-guiding and noise-reducing strip 13 can disperse airflow and reduce inlet noise. The surface of the flow-guiding and noise-reducing strip 13 is provided with screws that surround the main body of the flow-guiding and noise-reducing strip 13. The spiral groove 131 can guide the airflow that enters the second ejector tube 12 vertically into a swirling flow with a tangential velocity component, thereby enhancing the mixing efficiency. The bottom of the spiral groove 131 is provided with a biomimetic fish scale-shaped microstructure. The guide and noise-absorbing strip 13 is a hollow sealed cavity. The inner wall of the hollow sealed cavity is sprayed with a damping adhesive layer and filled with sound-absorbing cotton. The biomimetic fish scale-shaped microstructure, the damping adhesive layer, and the sound-absorbing cotton can further reduce noise and improve the user experience.

[0020] See also Figure 2 and Figure 3The top surface of the second housing 2 extends upward to provide a connection interface 21. The upper end of the connection interface 21 is sleeved on the outside of the second ejector tube 12 and there is an annular gap 211 between the connection interface 21 and the second ejector tube 12, so that the gas enters the internal cavity of the second housing 2 through the annular gap 211. The width of the annular gap 211 is controlled between 0.5-5mm to control the gas flow rate, ensure the gas flow rate is stable, and avoid excessive or insufficient gas flow. The lower end of the connection interface 21 is provided with an integrally formed columnar mixing chamber 22, which is located inside the second housing 2. The inner wall of the columnar mixing chamber 22 is provided with a spiral guide groove to extend the mixing path and enhance the mixing effect of gas and air. The pitch and depth of the spiral guide groove are designed according to the airflow parameters. 6-24 air outlets 221 are evenly distributed along the circumferential sidewall at the bottom of the columnar mixing chamber 22 to ensure that the mixed gas enters the volute-type guide chamber uniformly, avoiding local eddies or pressure unevenness. The columnar mixing chamber 22 is connected to the internal cavity of the second housing 2 through the air outlets 221. A centrifugal impeller (not shown in the figure) is provided inside the columnar mixing chamber 22 and is driven to rotate by a drive motor. The blades of the centrifugal impeller are backward-curved blades, with 8-12 blades to reduce energy consumption. It also improves mixing efficiency; the internal cavity of the second housing 2 is a volute-type flow guide cavity with an involute cross-sectional shape. After the mixed gas enters from the outlet 221, it flows along the involute-shaped cavity to the mixed gas outlet 24. The involute shape reduces gas flow resistance, reduces pressure loss, and improves gas output efficiency; the circumferential sidewall of the second housing 2 is provided with a mixed gas outlet 24, which is connected to the volute-type flow guide cavity. A flow regulating valve is provided at the mixed gas outlet 24 to precisely control the output flow rate of the mixed gas. The connection end of the mixed gas outlet 24 is a standard threaded interface for easy connection with external pipelines.

[0021] The internal cavity of the third housing 3 houses a drive motor (not shown in the figure). The drive motor is detachably connected to a bearing port 31 on the top of the third housing 3. A shock-absorbing sealing ring, made of rubber or silicone, is embedded in the bearing port 31 to reduce vibration and noise during operation and prevent the gas mixture from escaping from the bearing port 31. The output shaft of the drive motor is coaxial with the centrifugal impeller and connected via a keyway to ensure reliable transmission and prevent slippage. The bottom of the third housing 3 has heat dissipation holes to dissipate the heat generated by the drive motor. A dustproof mesh is installed inside the heat dissipation holes to prevent dust from entering. The dustproof mesh is detachably connected to the third housing 3 via clips.

[0022] Example 2 This embodiment provides a gas equipment, including the aforementioned gas mixer, combustion chamber assembly, ignition electrode assembly, and heat exchanger assembly. The mixed gas outlet 24 of the gas mixer is connected to the inlet of the combustion chamber assembly via a standard threaded interface. The interface is sealed with a high-temperature resistant gasket or thread sealant to prevent gas leakage and improve safety. The ignition electrode assembly is located in the flame stabilization zone of the combustion chamber assembly. The heat exchanger assembly is configured in the flue gas passage downstream of the combustion chamber.

[0023] As can be seen from the above, this application arranges the first ejector tube 11 tangentially, so that the gas forms a swirling flow when it enters the first housing 1; at the same time, the guide and silencer strip 13 set at the air ejector port, with its spiral groove 131, can convert the vertically entering airflow into a swirling flow, which can achieve efficient premixing of the two gases; subsequently, the mixed gas is further guided by the centrifugal impeller and the spiral guide groove on the inner wall in the columnar mixing chamber 22, which can greatly improve the uniformity and efficiency of the mixing of gas and air, laying the foundation for subsequent stable and efficient combustion; secondly, this device has superior... With its exceptional noise reduction performance, the airflow guiding and silencing strip 13 not only guides airflow, but its unique hollow cavity structure, internal sound-absorbing cotton filling, damping rubber layer, and biomimetic fish scale microstructure on the surface effectively absorb and weaken airflow noise. Combined with the vibration damping design at the drive motor, this ensures stable operation of the device in a low-noise state. Testing shows that the noise level of this device is less than 40 decibels. In summary, this application achieves efficient premixing of gas and air through structural innovation, greatly improving combustion stability and providing significant noise reduction. It is applicable to various high-efficiency, low-noise combustion equipment, especially combustion water heaters.

[0024] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A gas mixer, characterized in that, include: A first housing includes a first ejector tube, a second ejector tube, and a flow-guiding silencer strip. The first ejector tube is disposed on the circumferential sidewall of the first housing and communicates with the internal cavity of the first housing for ejecting combustion gas. The second ejector tube is disposed on the top of the first housing and extends axially into the internal cavity of the first housing for ejecting air. The flow-guiding silencer strip is provided at the inlet end of the second ejector tube. The two ends of the flow-guiding silencer strip are detachably fixed to the outer wall of the first housing. The flow-guiding silencer strip is a strip-shaped component that spans across and partially blocks the inlet section of the second ejector tube. The surface of the flow-guiding silencer strip is provided with a spiral groove that surrounds the main body of the flow-guiding silencer strip. The second housing has a top surface detachably connected to the bottom of the first housing. A connection interface extends upward from the top surface of the second housing. The upper end of the connection interface is fitted onto the outside of the second ejector tube, and an annular gap exists between the connection interface and the second ejector tube, allowing the gas to enter the internal cavity of the second housing through the annular gap. An integrally formed columnar mixing chamber is provided at the lower end of the connection interface. Multiple air outlets are formed along the circumferential sidewall of the bottom of the columnar mixing chamber. The columnar mixing chamber communicates with the internal cavity of the second housing through these air outlets. A centrifugal impeller is provided inside the columnar mixing chamber. The internal cavity of the second housing is a volute-type flow guide cavity. A mixed gas outlet is provided on the circumferential sidewall of the second housing, and the mixed gas outlet communicates with the volute-type flow guide cavity. The third housing has its top surface detachably connected to the bottom of the second housing. A drive motor is installed inside the internal cavity of the third housing. The drive motor is detachably connected to the bearing port at the top of the third housing. The output shaft of the drive motor is coaxially connected to the centrifugal impeller.

2. The gas mixer according to claim 1, characterized in that, The top surface of the second housing is provided with a positioning annular groove, and the bottom of the first housing is provided with a positioning annular protrusion. The positioning annular protrusion cooperates with the positioning annular groove, and the positioning annular groove is also provided with a sealing ring.

3. The gas mixer according to claim 1, characterized in that, The first ejector tube is arranged tangentially to the circumferential sidewall of the first housing.

4. The gas mixer according to claim 1, characterized in that, The width of the annular gap between the connection interface and the second ejector tube is between 0.5 and 5 mm.

5. The gas mixer according to claim 1, characterized in that, The inner wall of the columnar mixing chamber is provided with a spiral guide groove.

6. The gas mixer according to claim 1, characterized in that, The number of air outlets is 6-24, and they are evenly distributed on the bottom circumferential sidewall of the columnar mixing chamber.

7. The gas mixer according to claim 1, characterized in that, The cross-sectional shape of the volute-type flow guide cavity is involute.

8. The gas mixer according to claim 1, characterized in that, A flow regulating valve is provided at the outlet of the mixed gas.

9. The gas mixer according to claim 1, characterized in that, A shock-absorbing pad is provided between the drive motor and the bearing port.

10. A gas-fired device, characterized in that, The gas mixer comprising any one of claims 1-9 further comprises: The combustion chamber assembly is sealed and connected to the mixed gas outlet. Ignition electrode assembly is disposed in the flame stabilization zone of the combustion chamber assembly; A heat exchanger assembly is configured in the flue gas passage downstream of the combustion chamber.

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