Low-temperature jet mill

Abstract

The utility model discloses a low-temperature jet mill in the technical field of jet mill equipment, and aims to solve the problem that the temperature of materials inside the mill is possibly increased abnormally due to long-time work of the mill in the prior art. The device comprises a crushing tank, a plurality of high-speed airflow pipelines are arranged on the circumferential side of the crushing tank in a circumferential array mode, and the end of each high-speed airflow pipeline is provided with a Laval nozzle pointing to the interior of the crushing tank; the auxiliary air inlet pipelines are arranged on one side of the crushing tank, air outlets of the auxiliary air inlet pipelines are tangent to the inner wall of the crushing tank, and the included angle between the blowing direction of airflow, in the crushing tank, of the auxiliary air inlet pipelines and the direction of annular airflow blown out by the Laval nozzles in the crushing tank is an acute angle; and the refrigerating mechanism is used for supplying cooling gas to the auxiliary gas inlet pipeline. The heat-sensitive material pulverizer is used for pulverizing some heat-sensitive materials, and can supply cold air to the interior of pulverizer equipment to reduce the temperature of mixed materials, so that the production quality of products is ensured.

Description

Technical Field

[0001] The utility model relates to a low-temperature airflow pulverizer, belonging to the technical field of airflow pulverizer equipment. Background Technique

[0002] An airflow pulverizer realizes the pulverization of powdery granular materials in the pulverizer equipment through high-speed airflow. During the long-term operation of the airflow pulverizer, the friction between the material particles will cause the temperature of the material inside the equipment to rise. For some heat-sensitive materials such as drugs and heat-sensitive materials, the temperature rise will cause the material to denature, thus reducing the product quality. Therefore, there is an urgent need for a method to control the temperature inside the pulverizer to manage the temperature in the airflow pulverizer equipment. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a low-temperature airflow pulverizer for the pulverization of some heat-sensitive materials, which can supply cold air to the inside of the pulverizer equipment to reduce the temperature of the mixed materials, thereby ensuring the production quality of the product.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A low-temperature airflow pulverizer provided by the utility model includes:

[0006] A pulverizing tank, around which a plurality of high-speed airflow pipes are arranged in a circumferential array, and a Laval nozzle pointing to the inside of the pulverizing tank is provided at the end of each high-speed airflow pipe;

[0007] A plurality of auxiliary air inlet pipes are arranged on one side of the pulverizing tank, the air outlet of the auxiliary air inlet pipe is tangent to the inner wall of the pulverizing tank, and the included angle between the airflow blowing direction of the auxiliary air inlet pipe inside the pulverizing tank and the annular airflow direction blown out by the Laval nozzle inside the pulverizing tank is an acute angle;

[0008] A refrigeration mechanism for supplying cooling gas to the auxiliary air inlet pipe;

[0009] A temperature detection sensor is arranged on the surface of the metal matrix of the pulverizing tank for detecting the surface temperature of the pulverizing tank.

[0010] Specifically, the number of the auxiliary air inlet pipes corresponds to the number of the Laval nozzles, the air inlet of each auxiliary air inlet pipe is arranged at the front end position of the corresponding Laval nozzle, and the central angle formed by the air inlet of each auxiliary air inlet pipe and the corresponding Laval nozzle with the axis of the pulverizing tank is not greater than °.

[0011] Specifically, the part of the auxiliary air inlet pipe inside the pulverizing tank is provided with a smooth transition piece, and the outlet of the smooth transition piece is arranged adjacent to the outlet of the Laval nozzle.

[0012] Specifically, the refrigeration mechanism is a vortex tube, and the cold air outlet of the vortex tube is communicated with the air inlet of the auxiliary air inlet pipe.

[0013] Specifically, the refrigeration mechanism includes a cooling tank, a coolant is provided in the cooling tank, a cooler for cooling the coolant is further provided on the cooling tank, a bubble stone communicating with an air pump is provided at the bottom of the cooling tank, and a communicating pipe is provided at a position above the coolant in the cooling tank, and the communicating pipe is communicated with the air inlet of the auxiliary air inlet pipe.

[0014] Specifically, an air outlet pipe is communicated and arranged at the top of the cooling tank.

[0015] Specifically, the cooler is a semiconductor refrigeration sheet, and the refrigeration sheet of the semiconductor refrigeration sheet is in contact with the wall surface of the cooling tank.

[0016] Specifically, a plurality of baffle plates are provided inside the cooling tank, and the plurality of baffle plates are alternately arranged in a layered manner on both sides of the inner wall of the cooling tank, and the baffle plates are used to extend the heat exchange time of the bubbles inside the cooling tank.

[0017] Specifically, the open end of the topmost baffle plate is close to the air inlet of the communicating pipe, and the air inlet of the communicating pipe is arranged at a position far from the air outlet pipe.

[0018] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0019] The jet mill provided by the present utility model is provided with an auxiliary air inlet pipe on the side wall of the mill for supplying gas to the inside thereof. By designing the auxiliary air inlet pipe to be tangent to the inner wall of the pulverizing tank, cooling gas can be drawn into the equipment to cool the material without dust leakage. The structure is simple and is beneficial to ensuring the quality of the final product. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the low-temperature jet mill provided by the embodiment of the present utility model;

[0021] Figure 2 is the front view of the low-temperature jet mill provided by the embodiment of the present utility model;

[0022] Figure 3 is the sectional view taken along the A-A direction of the low-temperature jet mill provided by the Figure 2 embodiment of the present utility model;

[0023] Figure 4 It is a side view of the low-temperature airflow pulverizer provided by the embodiment of the present utility model;

[0024] Figure 5 is the present utility model Figure 4 A sectional view taken along line B-B of the low-temperature airflow pulverizer provided by the embodiment;

[0025] Reference numerals: 1, pulverizing tank; 2, high-speed airflow pipeline; 3, Laval nozzle; 4, auxiliary air intake pipeline; 5, vortex tube; 6, cooling box; 7, air bubble stone; 8, connecting pipe; 9, air outlet pipe; 10, semiconductor refrigerating sheet; 11, baffle plate; 12, drying pipe. Detailed implementation manners

[0026] The present utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, and cannot be used to limit the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the 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 thus cannot be understood as a limitation of 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 quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations. Embodiment

[0029] A low-temperature air-flow pulverizer provided by an embodiment of the present utility model is used for pulverizing some heat-sensitive materials. It can supply cold air into the pulverizer equipment to reduce the temperature of the mixed materials, thereby ensuring the production quality of the products. To realize the structural functions of the pulverizer device, the device is provided with a pulverizing tank 1, and a number of high-speed air-flow pipes 2 are arranged in a circumferential array on the periphery of the pulverizing tank 1. A Laval nozzle 3 pointing to the inside of the pulverizing tank 1 is provided at the end of each high-speed air-flow pipe 2, as Figure 3 shown. The Laval nozzle 3 is used to spray high-speed air flow to form a high-speed annular air flow inside the pulverizing tank 1. To cool the pulverized powder inside the air flow, the device is further provided with a number of auxiliary air intake pipes 4. Specifically, as Figure 1 and Figure 3 shown, the auxiliary air intake pipes 4 are arranged on one side of the pulverizing tank 1. The air outlet of the auxiliary air intake pipe 4 is tangent to the inner wall of the pulverizing tank 1. The included angle between the air flow direction of the auxiliary air intake pipe 4 inside the pulverizing tank 1 and the annular air flow direction blown out by the Laval nozzle 3 inside the pulverizing tank 1 is an acute angle. Through this setting method, the auxiliary air intake pipe 4 can normally supply cooling gas into the pulverizing tank 1 without leakage of the internal gas. Since the high-speed air flow will finally carry dust particles and discharge them upward from the pulverizing tank 1 through the classification wheel, the cold air entering the auxiliary air intake pipe 4 can realize the circulation from outside to inside. Without affecting the air-flow pulverization of particles, the temperature of the pulverized particles in the air flow is reduced, thereby ensuring the quality of the produced products and the reliable and stable operation of the equipment; and a refrigeration mechanism is provided to supply cooling gas to the auxiliary air intake pipe 4; to facilitate the detection of the temperature of the equipment, the device is further provided with a temperature detection sensor. Specifically, it is arranged on the surface of the metal matrix of the pulverizing tank 1 and is used to detect the surface temperature of the pulverizing tank 1, and the temperature inside the pulverizing tank 1 is roughly judged by detecting the indirect temperature, so as to avoid high-speed wear of relevant detection mechanisms inside the pulverizing tank 1.

[0030] For a low-temperature air-flow pulverizer provided by an embodiment of the present utility model, in order to smoothly roll the cold air into the inside of the pulverizing tank 1, preferably, the number of the auxiliary air intake pipes 4 can be set to correspond to the number of the Laval nozzles 3, and the air inlet of each auxiliary air intake pipe 4 is arranged at the front end position of the corresponding Laval nozzle 3, as Figure 3 shown. The central angle formed by the air inlet of each auxiliary air intake pipe 4 and the corresponding Laval nozzle 3 with the axis of the pulverizing tank 1 is not greater than 15°. Through this setting method, the air outlet position of the auxiliary air intake pipe 4 is close to the position of the Laval nozzle 3. The low pressure generated by the high-speed air flow in Bernoulli's principle introduces the external air flow into the equipment, so that the cooling gas can be smoothly rolled in while avoiding the outward blowing of dust. The part of the auxiliary air intake pipe 4 inside the pulverizing tank 1 is set as a smooth transition part, as Figure 3As shown, the air outlet position of the smooth transition piece is arranged near the air outlet of the Laval nozzle 3. Preferably, its wall surface is fitted with the inner wall of the pulverizing tank 1 to avoid disturbing the gas inside the pulverizing tank 1.

[0031] In a preferred embodiment of the low-temperature air flow pulverizer provided by the present utility model, as a preferred embodiment, the refrigeration mechanism is set as a vortex tube 5 here. The cold air outlet of the vortex tube 5 is communicated with the air inlet of the auxiliary air inlet pipe 4. The setting method of the vortex tube 5 is simple and can be directly butt-connected and installed. Its refrigeration effect is related to the flow rate of the high-pressure air flow introduced. In addition, the air volume of the cold air outlet end of the vortex tube 5 will not affect the convergence of the cooling gas. The negative pressure self-adsorption effect can help to suck the cooling gas at the cooling end of the vortex tube 5 to achieve adaptive temperature reduction.

[0032] The low-temperature air flow pulverizer provided by the embodiment of the present utility model specifically provides another mechanism for supplying cold air. Specifically, the refrigeration mechanism is set to include a cooling box 6 here. There is coolant in the cooling box 6. There is also a cooler for cooling the coolant on the cooling box 6. There is a bubble stone 7 communicating with an air pump at the bottom of the cooling box 6. There is a connecting pipe 8 at the position above the coolant in the cooling box 6. The connecting pipe 8 is communicated with the air inlet of the auxiliary air inlet pipe 4. When this cooling mechanism supplies cooling gas to the inside of the pulverizing tank 1, the small normal-temperature gas generated by the bubble stone 7 becomes low-temperature air after heat exchange with the coolant and gathers at the upper position of the liquid surface of the cooling box 6. At this time, the cooling gas in the upper half of the cooling box 6 is sucked into the pulverizing tank 1 by using the way of the equipment sucking in external gas, thereby realizing the temperature reduction inside the pulverizing tank 1 equipment. In order to prevent humidity from affecting the pulverized material particles, a drying pipe 12 can be arranged at the air outlet end of the connecting pipe 8 of the cooling box 6 to contain a desiccant to avoid increasing the humidity in the pulverizing tank 1 and thus affecting the quality of the finished product. In some embodiments, in order to adapt to the ability of the equipment to draw in external gas and balance the air pressure in the cooling box 6, an air outlet pipe 9 can be connected and arranged at the top of the cooling box 6. Through this setting, the air pressure in the cooling box 6 will not increase when the air intake of the bubble stone 7 is large, and when the air supply of the bubble stone 7 is insufficient, external gas can be introduced adaptively to avoid generating negative pressure and sucking the dust in the pulverizing tank 1 into the cooling box 6. The cooler can be a semiconductor refrigeration sheet 10. The refrigeration sheet of the semiconductor refrigeration sheet 10 is in contact with the wall surface of the cooling box 6, and the coolant can be cooled indirectly. The coolant can be preferably ethylene glycol solution.

[0033] In the low-temperature air flow pulverizer provided by the embodiment of the present utility model, in order to increase the heat exchange time of the gas generated by the bubble stone 7, a plurality of baffle plates 11 can be arranged inside the cooling box 6, such as Figure 5As shown, a number of baffle plates 11 are arranged in layers in the cooling box 6 and are alternately provided on both sides of the inner wall of the cooling box 6. The baffle plates 11 are used to extend the heat exchange time of the bubbles inside the cooling box 6 so as to be able to generate gas with a lower temperature, thereby realizing efficient cooling inside the pulverizing tank 1.

[0034] For a low-temperature type air flow pulverizer provided by an embodiment of the present invention, in order to extend the residence time of the cooling gas in the cooling box 6 and improve the utilization efficiency of the cold air, the open end of the topmost baffle plate 11 can be arranged close to the air inlet of the connecting pipe 8, and the air inlet of the connecting pipe 8 is arranged at a position far from the air outlet pipe 9, that is, the cold air can be supplied to the position of the connecting pipe 8 at the first time after being generated. When the cold air overflows, it finally overflows from the position of the air outlet pipe 9, avoiding the situation that the cold air overflows immediately after being generated, thereby improving the refrigeration efficiency of the cold air.

[0035] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A low temperature air flow mill, characterized in that: include: A pulverizing pot (1), wherein a plurality of high-speed airflow pipes (2) are arranged in a circular array on the circumference of the pulverizing pot (1), and each end of the high-speed airflow pipe (2) is provided with a Laval nozzle (3) pointing toward the interior of the pulverizing pot (1); A plurality of auxiliary air intake pipes (4) are arranged on one side of the crushing pot (1), the air outlet of the auxiliary air intake pipe (4) is tangent to the inner wall of the crushing pot (1), and the angle between the airflow direction of the auxiliary air intake pipe (4) inside the crushing pot (1) and the direction of the annular airflow blown out by the Laval nozzle (3) inside the crushing pot (1) is an acute angle; A refrigeration mechanism, used for supplying cooling gas to the auxiliary air intake duct (4); The temperature detection sensor is arranged on the surface of the metal base of the crushing tank (1) and is used to detect the surface temperature of the crushing tank (1).

2. A low temperature air flow mill according to claim 1, characterized in that: The number of the auxiliary air intake pipes (4) corresponds to the number of the Laval nozzles (3), the air intake of each of the auxiliary air intake pipes (4) is arranged at the front end of the corresponding Laval nozzle (3), and the central angle formed by the air intake of each of the auxiliary air intake pipes (4) and the corresponding Laval nozzle (3) with the axis of the crushing tank (1) is not greater than 15°.

3. A low temperature air flow mill according to claim 2, characterized in that: The portion of the auxiliary air intake duct (4) inside the pulverizing tank (1) is arranged as a smooth transition piece, and the air outlet of the smooth transition piece is arranged adjacent to the air outlet of the Laval nozzle (3).

4. A low temperature air flow mill according to claim 3, characterized in that: The refrigeration mechanism is a vortex tube (5), and the cold air outlet of the vortex tube (5) is connected to the air inlet of the auxiliary air inlet duct (4).

5. A low temperature air flow mill according to claim 3, characterized in that: The refrigeration mechanism comprises a cooling box (6), wherein a cooling liquid is arranged in the cooling box (6), and a cooler for cooling the cooling liquid is also arranged on the cooling box (6), and an air bubble stone (7) connected to an air pump is arranged at the bottom of the cooling box (6), and a connecting pipe (8) is arranged at a position above the cooling liquid, and the connecting pipe (8) is connected to an air inlet of the auxiliary air intake pipe (4).

6. A low temperature air flow pulverizer according to claim 5, characterized in that: An air outlet pipe (9) is provided in communication with the top of the cooling box (6).

7. A low temperature air flow pulverizer according to claim 5, characterized in that: The cooler is a semiconductor refrigeration sheet (10), and a refrigeration sheet of the semiconductor refrigeration sheet (10) is in contact with a wall surface of the cooling box (6).

8. A low temperature air flow pulverizer according to claim 6, characterized in that: A plurality of baffles (11) are arranged inside the cooling box (6); the baffles (11) are distributed in layers inside the cooling box (6) and are alternately arranged on both sides of the inner wall of the cooling box (6); the baffles (11) are used to prolong the heat exchange time of the bubbles inside the cooling box (6).

9. A low temperature air flow pulverizer according to claim 8, characterized in that: The opening end of the baffle plate (11) at the top is close to the air inlet of the connecting pipe (8), and the air inlet of the connecting pipe (8) is arranged away from the position of the air outlet pipe (9).

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