Anti-wear nozzle for jet mill

Abstract

The utility model discloses an anti-abrasion nozzle for a jet mill in the technical field of nozzles, and aims to solve the problems of short service life and poor spraying effect of the nozzle caused by serious abrasion between the nozzle of the jet mill and particulate matters in the using process in the prior art. The nozzle structure comprises a main body forming the nozzle structure, the main body is provided with a main gas path channel used for jetting high-speed gas flow, the peripheral side of the main body is further provided with a plurality of auxiliary gas holes, and the auxiliary gas holes are used for supplying protective gas to the jetting position of the main gas path channel. The included angle between the blowing-out direction of the protective gas and the blowing-out direction of the high-speed airflow is smaller than 90 degrees. The nozzle is used for introducing protective airflow from the peripheral side of high-speed airflow when the high-speed airflow is supplied, abrasion caused by contact between particles and the nozzle opening is reduced, and therefore the service life of the nozzle is prolonged.

Description

Technical Field

[0001] The utility model relates to an anti-wear nozzle for an air flow pulverizer, belonging to the technical field of nozzles. Background Art

[0002] Airflow mills are devices that pass gas into the mill at supersonic speed so that the particles inside the mill can impact each other under high pressure to form smaller particles. Inside the airflow mill, the smaller the particle size of the crushed particles, the greater their hardness, which will increase the degree of wear. Figure 1 As shown, when a traditional nozzle sprays a high-speed airflow, the non-high-speed spraying area of ​​the front end face of the nozzle will continuously rub against the gas in the air flow pulverizer. If the hard particles contained in the gas collide with the nozzle outlet, it will cause wear of the nozzle outlet. In the case of a nozzle that sprays air at a supersonic speed, even if the wear causes a slight increase in the diameter of the nozzle outlet, it will cause a large change in the air speed at the nozzle outlet. Therefore, when the nozzle is worn to a certain extent, it must be replaced, resulting in a shorter overall service life. Summary of the invention

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an anti-wear nozzle for an air flow pulverizer, which is used to form a protective air flow layer on the peripheral side of the high-speed air flow when supplying a high-speed air flow, so as to reduce the wear caused by the contact between the air containing particles in the equipment and the nozzle mouth, thereby increasing the service life of the nozzle.

[0004] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0005] The utility model provides an anti-wear nozzle for an air flow pulverizer.

[0006] Specifically, it includes a main body constituting a nozzle structure, the main body is provided with a main air path channel for injecting high-speed airflow, and the surrounding side of the main body is also provided with a plurality of auxiliary air holes, the auxiliary air holes are used to supply protective gas to the ejection position of the main air path channel, and the angle between the blowing direction of the protective gas and the blowing direction of the high-speed airflow is less than ninety degrees.

[0007] Specifically, the front end of the main body is in a trumpet shape, the blowing port of the auxiliary air hole points to the ejection position of the high-speed airflow, and the air inlet of the auxiliary air hole penetrates the outer wall of the main body and is connected with the outside.

[0008] Specifically, the aperture transition between the air inlet and the air blowing port of the auxiliary air hole decreases gradually.

[0009] Specifically, the auxiliary air holes are arranged in a spiral shape.

[0010] Specifically, the blowing port of the auxiliary air hole points to the ejection position of the high-speed airflow, and the air inlet of the auxiliary air hole is connected to the main air path channel.

[0011] Specifically, the aperture transition between the air inlet and the air outlet of the auxiliary air hole increases gradually.

[0012] Specifically, the auxiliary air holes are arranged in a spiral shape.

[0013] Specifically, it also includes a nozzle bracket, which is used to simultaneously install multiple bodies and supply gas to the main gas channels of the multiple bodies.

[0014] Specifically, the nozzle bracket is in a truncated cone shape, and the plurality of main bodies are respectively mounted on the front end surface and the side end arc surface of the truncated cone.

[0015] Specifically, each of the main bodies is detachably connected to the bracket.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The anti-wear nozzle provided by the utility model supplies auxiliary airflow on both sides of the main jet passage to form an air protection layer for the material near the jet port, which can converge to the main air passage, thereby reducing the direct contact friction between fine particles and the nozzle port, thereby reducing the wear on the nozzle, ensuring good stability of the airflow supply and effectively increasing the actual service life of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the causes of nozzle wear in current jet mills;

[0019] Figure 2 It is a schematic diagram of the overall structure of the anti-wear nozzle provided by the embodiment of the utility model;

[0020] Figure 3 It is another structural schematic diagram of the anti-wear nozzle provided by the embodiment of the utility model;

[0021] Figure 4 This utility model Figure 3 A cross-sectional view of the internal structure of the anti-wear nozzle provided in the embodiment;

[0022] Figure 5 It is a schematic diagram of the assembly structure of the anti-wear nozzle provided by the embodiment of the utility model;

[0023] Figure 6 It is a side view of the anti-wear nozzle provided by the embodiment of the utility model;

[0024] Figure 7 This utility model Figure 6 A cross-sectional view of the anti-wear nozzle provided in the embodiment along the AA direction;

[0025] Figure 8 Schematic diagram of the nozzle anti-wear principle provided by the embodiment of the utility model;

[0026] Figure numerals: 1, main body; 101, main air channel; 102, auxiliary air hole; 2, nozzle bracket. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Embodiment 1

[0030] The wear-resistant nozzle for the air flow mill provided in the embodiment of the utility model is used to introduce a protective air flow around the high-speed air flow when supplying the high-speed air flow, so as to reduce the wear caused by the contact between the particles and the nozzle opening, thereby improving the service life of the nozzle. In order to realize the structural function of the nozzle, the nozzle structure is provided here to at least include a main body 1 constituting the nozzle structure. Specifically, a main air path channel 101 for injecting the high-speed air flow is provided on the main body 1, which is generally considered to be arranged in the middle position of the main body 1, which can be referred to Figure 2 As shown, in order to form a stable airflow protection layer to reduce the wear effect of fine particles on the nozzle outlet, a number of auxiliary air holes 102 are provided on the peripheral side of the main body 1. The auxiliary air holes 102 are used to supply protective gas to the ejection position of the main air path channel 101. In order to prevent the gas blown out of the auxiliary air holes 102 from affecting the output of the main working air path, it is necessary to set the angle between the blowing direction of the protective gas and the blowing direction of the high-speed airflow to be less than 90 degrees, so as to avoid affecting the flow rate of the main working air path by blowing in the same direction. Figure 1 The bell-mouth type is used for blowing, and the blowing direction of the auxiliary air hole 102 is located on the arc surface of the bell-mouth, so that the auxiliary airflow can adaptively converge to the diffusion direction of the main working airflow to form an airflow protection layer with a certain protection range. For details, please refer to Figure 8 As shown, the air outlet position of the nozzle is used to spray high-speed airflow, and the auxiliary air hole 102 supplies auxiliary airflow to the high-speed airflow spray area so that the auxiliary airflow can converge to the high-speed airflow spray area. In this way, a stable protective air flow layer can be formed between the air outlet of the auxiliary air hole 102 and the high-speed airflow spray area, thereby reducing the wear and collision of fine particles entrained by the particle-containing gas in the pulverizer cavity along the inner wall of the nozzle outlet and the area around the main air path 101, and can guide the particle-containing gas that wants to enter the nozzle to the high-speed airflow spray area under the action of the auxiliary airflow, thereby avoiding the collision of fine particles in a high-speed state around the nozzle with the nozzle surface.

[0031] The wear-resistant nozzle for the air flow pulverizer provided by the embodiment of the utility model can simplify the source of the auxiliary air flow by utilizing the principle that the pressure is low at a location with high wind speed to allow the surrounding low-pressure gas to automatically merge into the main working air flow, thereby forming a corresponding air flow protection layer to protect the nozzle's ejection position. Specifically, the front end of the main body 1 is set to be in a trumpet shape, the blowing port of the auxiliary air hole 102 is directed to the ejection position of the high-speed air flow, and the air inlet of the auxiliary air hole 102 is set to penetrate the outer wall of the main body 1 and communicate with the outside world. The specific shape setting can be referred to Figure 1 As shown, the aperture transition between the air inlet and the air outlet of the auxiliary air hole 102 decreases gradually, and the large aperture of the air inlet is conducive to inhaling the surrounding low-pressure gas. Figure 8As shown, after the high-speed airflow is ejected through the main gas path 101, it is ejected to the outside in a diffused manner. Since the caliber of the high-speed airflow becomes larger during diffusion and diffuses toward the inner wall of the bell mouth, and the gas flow rate decreases with the increase in the degree of diffusion, the auxiliary air hole 102 is directed to a position close to the high-flow rate injection gas. The high-flow rate position can form a large negative pressure, and there is a large pressure difference with the normal-pressure gas in the auxiliary air hole 102, so that the normal-pressure air in the auxiliary air hole 102 is sucked into the high-flow rate main gas path, thereby forming a corresponding airflow protection layer to protect the nozzle at the outlet position of the main gas path 101.

[0032] The wear-resistant nozzle for the airflow pulverizer provided in the embodiment of the utility model has a limited number of auxiliary air holes 102 on the main body 1. If the auxiliary air holes 102 are designed in a linear shape, the ejected auxiliary airflow is prone to produce a gap in the protective gas layer at the gap position. Therefore, as a further preferred embodiment of the embodiment, the auxiliary air holes 102 are arranged in a spiral shape, such as Figure 1 As shown, the ejected air flow will be ejected obliquely in a manner tangential to the air outlet, and the multiple auxiliary air holes 102 work together to form an annular air flow protection layer, which is beneficial to further prevent fine particles from causing wear to the nozzle from the gap position. Embodiment 2

[0033] The anti-wear nozzle for the air flow mill provided in the embodiment of the utility model is different from the embodiment 1 in that an additional auxiliary air supply method is provided. Figure 3 and Figure 4 As shown, the blowing port of the auxiliary air hole 102 points to the ejection position of the high-speed airflow, and the air inlet of the auxiliary air hole 102 is connected with the main air path channel 101. Here, the auxiliary air hole 102 is directly connected with the main air path channel 101 to guide the gas of the main air path channel 101 to the auxiliary air hole 102 and then eject it. Although this method will consume a certain amount of flow in the main air path channel 101, it can stably supply gas with a fixed flow rate to form an air protection layer at the edge of the nozzle, which is beneficial to provide more stable anti-wear protection for the nozzle. The direction of the auxiliary air hole 102 can also be set in a spiral shape as shown in Example 1.

[0034] The wear-resistant nozzle for the air flow pulverizer provided in the embodiment of the utility model has an air flow protection layer that converges with the main working air path in the form of a spray, so the aperture transition between the air inlet and the air outlet of the auxiliary air hole 102 is increased gradually to spray in a diffuse manner. Embodiment 3

[0035] The wear-resistant nozzle for the air flow pulverizer provided in the embodiment of the utility model is used to supply multi-directional high-speed airflow in the air flow pulverizer to improve the pulverizing efficiency of the device. For this purpose, the nozzle mechanism is provided here and also includes a nozzle bracket 2. Specifically, the nozzle bracket 2 is used to simultaneously install multiple main bodies 1 and supply gas to the main gas path channels 101 of the multiple main bodies 1. Figure 5-Figure 7 As shown, the main body 1 can be the main body described in the first embodiment or the second embodiment, and a reasonable selection can be made according to actual use requirements.

[0036] The wear-resistant nozzle for the airflow pulverizer provided in the embodiment of the utility model specifically provides a nozzle bracket 2 with a relatively strong spraying direction. Specifically, it is preferred to set the nozzle bracket 2 in a truncated cone shape, and multiple main bodies 1 are respectively installed on the front end surface and the side end arc surface of the truncated cone. Figure 5 As shown, after installation, the nozzle can spray over a large range along a fixed directional range, thereby improving the crushing efficiency. Considering the convenience of installing each main body 1, each main body 1 can be provided with a detachable connection with the nozzle bracket 2, such as a threaded connection, etc. The specific method is not limited here.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An anti-wear nozzle for air flow mill, characterized in that: The invention comprises a main body (1) constituting a nozzle structure, wherein the main body (1) is provided with a main gas path channel (101) for injecting a high-speed gas flow, and the main body (1) is also provided with a plurality of auxiliary gas holes (102) on the peripheral side, wherein the auxiliary gas holes (102) are used to supply a protective gas to a spraying position of the main gas path channel (101), and the angle between the blowing direction of the protective gas and the blowing direction of the high-speed gas flow is less than ninety degrees.

2. The wear-resistant nozzle for air flow mill according to claim 1, characterized in that: The front end of the main body (1) is in a trumpet shape, the blowing port of the auxiliary air hole (102) points to the ejection position of the high-speed airflow, and the air inlet of the auxiliary air hole (102) penetrates the outer wall of the main body (1) and is connected to the outside.

3. The wear-resistant nozzle for air flow mill according to claim 2, characterized in that: The aperture transition between the air inlet and the air blowing port of the auxiliary air hole (102) decreases gradually.

4. The wear-resistant nozzle for a jet mill according to claim 2, characterized in that: The auxiliary air holes (102) are arranged in a spiral shape.

5. The wear-resistant nozzle for a jet mill according to claim 1, characterized in that: The air outlet of the auxiliary air hole (102) points to the ejection position of the high-speed airflow, and the air inlet of the auxiliary air hole (102) is connected to the main air passage (101).

6. The wear-resistant nozzle for a jet mill according to claim 5, characterized in that: The aperture transition between the air inlet and the air outlet of the auxiliary air hole (102) increases gradually.

7. The wear-resistant nozzle for a jet mill according to claim 5, characterized in that: The auxiliary air holes (102) are arranged in a spiral shape.

8. The wear-resistant nozzle for a jet mill according to any one of claims 1 to 7, characterized in that: It also comprises a nozzle bracket (2), wherein the nozzle bracket (2) is used to simultaneously mount a plurality of main bodies (1) and supply gas to the main gas passages (101) of the plurality of main bodies (1).

9. The wear-resistant nozzle for a jet mill according to claim 8, characterized in that: The nozzle support (2) is in the shape of a truncated cone, and the plurality of main bodies (1) are respectively mounted on the front end surface and the side end arc surface of the truncated cone.

10. The wear-resistant nozzle for a jet mill according to claim 8, characterized in that: Each of the main bodies (1) is detachably connected to the nozzle bracket (2).

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