CN202935945U - Positive and negative pressure combined dense phase powder material pneumatic conveying device - Google Patents

Abstract

The positive and negative pressure combined dense phase powder material pneumatic conveying equipment has positive pressure conveying and sending bin and negative pressure conveying and receiving bin, the sending bin and the receiving bin are coaxially connected via middle powder feeding butterfly valve, the lower end of the sending bin is equipped with powder outlet pipeline, the powder outlet pipeline is equipped with several powder outlet two-way valves, the upper portion of the sending bin is equipped with material level sensor, pressure sensor and air inlet valve, the upper end of the receiving bin is connected with air filtering bin, a partition board is placed between the receiving bin and the air filtering bin, on the partition board a bag-type air filter is mounted, the back-blowing pipe of the filter is connected with air storage tank by means of control valve, the above-mentioned filtering bin is equipped with vacuum generator, the receiving bin is equipped with material level sensor and feed inlet, the feed inlet is connected with powder inlet pipeline, and the powder inlet pipeline is equipped with several powder inlet. The utility model discloses can realize that the powder material is by the transport of multipoint to multipoint, have simple structure, small, area is few, characteristics that conveying efficiency is high.

Description

Positive and negative pressure combined dense phase powder material pneumatic conveying device

technical field

The utility model relates to dense phase pneumatic conveying equipment for powder materials, in particular to a positive and negative pressure combined dense phase powder material pneumatic conveying device. the

Background technique

Pneumatic conveying technology can be divided into dense phase pneumatic conveying and dilute phase pneumatic conveying according to the ratio of conveying unit mass material to gas mass consumed. Due to the high efficiency of dense-phase pneumatic conveying, obvious energy-saving effect, and obvious advantages such as small damage to material particles and easy solid-gas separation, it has been widely used in recent years. Dense-phase pneumatic conveying operation can be realized by positive pressure pneumatic conveying or negative pressure pneumatic conveying. When it is necessary to realize the dense-phase conveying operation from multiple starting points to multiple target points, it is necessary to combine positive and negative pressure dense-phase conveying equipment. The positive and negative pressure dense-phase conveying combined equipment in the prior art has the problems of complex structure, large floor area and low conveying efficiency. the

Contents of the invention

The purpose of this utility model is to solve the above problems, to provide a positive and negative pressure combined dense-phase powder material air pump with simple structure, small floor space, high conveying efficiency, and the ability to realize the powder material from multi-point to multi-point conveying operation. delivery device. the

The technical solution to achieve the above purpose is: a positive and negative pressure combined dense-phase powder material pneumatic conveying device, which has a positive pressure conveying sending bin placed below and a negative pressure conveying receiving bin placed above, the The positive pressure conveying sending chamber and the negative pressure conveying receiving chamber are cylindrical chambers with conical buckets at the bottom. It is connected with the coaxial line, the lower end of the positive pressure conveying and sending chamber is connected with a powder outlet pipeline equipped with a pipeline valve, and the upper part of the positive pressure conveying and sending chamber is equipped with a sending chamber material level sensor, a pressure sensor and a compressed air inlet valve , the upper end of the negative pressure delivery receiving bin is connected to an air filter, a fixed partition is set between the negative pressure delivery receiving bin and the air filter bin, and the bag-type The air filter is connected to the filter installation port on the fixed partition, and the filter blowback pipe drawn from the filter installation port is connected to a compressed air storage tank through a two-position two-way control valve. The air filter bin is equipped with a vacuum generator above, and the negative pressure delivery receiving bin is equipped with a receiving bin material level sensor and a feeding port, and the feeding port is connected to a powder feeding pipeline, and the powder feeding pipeline is assembled There are multiple powder inlet pressure-bearing two-way valves, and the powder outlet pipeline is equipped with multiple powder outlet pressure-bearing two-way valves. the

The technical solution of the present invention also includes: multiple bag-type air filters are provided. the

The positive and negative pressure combined dense-phase powder material pneumatic conveying device of the utility model can realize the conveying operation of the powder material from multiple points to multiple points, and has the characteristics of simple structure, small volume, less floor space and high conveying efficiency. the

Description of drawings

Figure 1 is a schematic structural view of the positive and negative pressure combined dense phase powder material pneumatic conveying device. the

Detailed ways

The specific embodiment of the utility model will be described in conjunction with the accompanying drawings. the

As shown in the attached figure, this positive and negative pressure combined dense-phase powder material pneumatic conveying device has a positive pressure conveying and sending chamber 2 placed below and a negative pressure conveying receiving chamber 7 placed above, and its positive pressure conveying and sending chamber 2 And the negative pressure conveying accepting bin 7 is the cylindrical bin body that the bottom is provided with conical bucket body, and the taper angle of the conical bucket body at the bottom of the two bin bodies is between 30° and 60°. The ratio of the diameter to the height of the cylinder body part of the positive pressure conveying chamber 2 is between 1:0.8 and 1:1.8, and the upper end of the positive pressure conveying chamber 2 is arranged as a hemispherical body, and the center of the hemispherical body A pressure-bearing powder-feeding butterfly valve 3 is installed at the position, and the pressure-bearing powder-feeding butterfly valve 3 vertically connects the positive-pressure conveying sending chamber 2 and the negative-pressure conveying receiving chamber 7 with coaxial lines. The upper part of the positive pressure delivery sending bin 2 is equipped with a sending bin material level sensor 4 , a pressure sensor 5 and a compressed air inlet valve 6 . The lower end of the positive pressure conveying and sending chamber 2 is connected to a powder outlet pipeline 17 equipped with a pipeline valve 1 , and the powder outlet pipeline 17 is equipped with a plurality of powder outlet pressure-bearing two-way valves 20 . The upper end of the negative pressure delivery receiving bin 7 is connected with an air filter bin 8, and the negative pressure delivery receiving bin 7 and the air filter bin 8 are connected by a flange. A fixed partition 9 is set between the negative pressure conveying and receiving chamber 7 and the air filter chamber 8, and the fixed partition 9 separates the negative pressure conveying and accepting chamber 7 from the air filtering chamber 8. There is a round hole on the fixed partition 9, and a bag-type air filter 14 is installed in the round hole, and a compressed air back-blowing air pipe 13 is installed above the filter opening, and the back-blowing air pipe 13 and the two-position two-way control valve 11 Connected, the two-position two-way valve 11 is installed on the compressed air storage tank 12, and the compressed air storage tank 12 is located outside the air filter chamber 8 and is fixedly connected with it. As shown in the accompanying drawings, the utility model can provide a plurality of round holes on the fixed partition 9, and install a bag-type air filter 14 in each round hole, and each bag-type air filter 14 is equipped with compressed air respectively. The blowback air pipe 13 and the two-position two-way control valve 11 form a multi-bag air filter structure. On the cylindrical body of the negative pressure conveying and receiving bin 7, a material level sensor 15 and a feed inlet 16 are arranged near the lower end of the bag-type air filter 14, and the feed inlet 16 is connected with a powder inlet pipeline 18, and the powder inlet pipeline 18 is equipped with a plurality of powder-feeding pressure-bearing two-way valves 19. the

The working principle of the utility model is described as follows:

When it is necessary to transport the powder material from a certain point in points a, b, and c to a certain point in d, e, and f, the pressure-bearing two-way valves 19 and 20 at this point are opened, and only this point is connected with the The delivery pipelines are connected. Then start the positive and negative pressure combined dense-phase powder material pneumatic conveying device. After the device is started, first close the pipeline valve 1 and open the powder inlet butterfly valve 3, so that the powder outlet pipeline of the positive pressure conveying and sending bin 2 is closed, and it is connected with the negative pressure. The conveying and receiving bin 7 is connected. Start the vacuum generator 10, so that the negative pressure delivery receiving bin 7 and the positive pressure delivery sending bin 2 generate negative pressure at the same time. Under the joint action of the negative pressure and the gas-powder mixing valve (not shown in the figure), the powder material at the point communicating with the powder inlet pipeline 18 is transported to the negative pressure conveying and receiving bin 7 through the pipeline 18, and then the powder material Under the action of gravity, it falls into the positive pressure conveying and sending bin 2 through the powder inlet butterfly valve 3 . The air that enters the negative pressure conveying and receiving bin 7 together with the powder material passes through the bag type air filter 14 and is sucked away by the vacuum generator 10 , and the dust entrained in this part of the air is filtered out by the bag type air filter 14 . After the bag-type air filter 14 works for a period of time, its filter micropores will be partially blocked, which will reduce the filtration efficiency. For this reason, a compressed air back-blowing air pipe is installed above the opening of each bag-type air filter. 13. The back-blowing air pipe circulates and back-flushes each filter separately at intervals of a certain period of time to remove the dust adhering to the surface of the bag-type air filter 14, so as to ensure the efficiency of the filter. When the height of the powder material in the positive pressure conveying sending bin 2 reaches near the position of the sending bin material level sensor 4, the sending bin material level sensor 4 sends out a signal, the powder inlet butterfly valve 3 is closed, and the negative pressure conveying system continues to work. After the powder inlet butterfly valve 3 is closed, the compressed air intake valve 6 is opened to fill the positive pressure conveying chamber 2 with clean compressed air. When the pressure in the positive pressure conveying chamber 2 reaches the set value, the positive pressure conveying chamber 2 The powder and compressed air in 2 have been fully mixed. At this time, the pipeline valve 1 is opened, and the pressurized powder material in the delivery chamber 2 will enter the designated delivery point along the powder outlet pipeline 17. . Of course, it is necessary to set some air supply valves on the powder outlet pipeline 17 like a general positive pressure conveying system, and at the same time, some material conveying state control valves can be set at the lower end of the positive pressure conveying and sending bin 2 to realize the control of powder materials. The delivery status is controlled. After all the powder materials in the positive pressure conveying and sending chamber 2 have been conveyed, the pressure in the positive pressure conveying and sending chamber 2 gradually returns to the normal pressure state. The air in the conveying and sending chamber 2 enters the upper part of the negative pressure conveying and receiving chamber 7 through the negative pressure conveying and receiving chamber 7, and then, after being filtered by the bag-type air filter 14, it is sucked away by the vacuum generator 10 . When the pressure in the positive pressure conveying sending chamber 2 is close to the pressure in the negative pressure conveying receiving chamber 7, the powder material in the negative pressure conveying receiving chamber 7 falls into the positive pressure conveying sending chamber 2 under the action of gravity, when When the material level height in the positive pressure conveying sending chamber 2 reaches the vicinity of its material level sensor 4 again, the material level sensor sends out a signal, and the positive pressure conveying sending chamber 2 performs the positive pressure conveying operation again. This combination of continuous negative pressure conveying operation and intermittent positive pressure conveying operation realizes the multi-point to multi-point powder material conveying operation. Generally speaking, the speed of positive pressure conveying of powder is much higher than that of negative pressure conveying, and the time used for positive pressure conveying is very short. At the same time, the volume below the receiving bin material level sensor 15 of negative pressure conveying receiving bin 7 is designed to be sufficient Large, after the powder inlet butterfly valve 3 is closed, the powder material entering the negative pressure conveying receiving chamber 7 cannot reach the position where the receiving chamber material level sensor 15 is located during the period of time when the positive pressure conveying and sending chamber 2 is performing positive pressure conveying operation. position, the negative pressure delivery system works continuously. But when there is a problem with the positive pressure conveying system, the time of positive pressure operation may be too normal, so that the powder material in the negative pressure conveying receiving bin 7 reaches the position where the receiving bin material level sensor 15 is located. At this time, the receiving bin material level sensor 15 sends a signal, and the negative pressure conveying system stops operating, so as to avoid excessive powder materials entering the negative pressure conveying receiving bin 7 and damaging the negative pressure conveying system, which is also the function of the receiving bin material level sensor 15.

Claims (2)

1. the close phase powder material of positive negative pressure combined type Pneumatic conveyer, it is characterized in that: it has a malleation that is placed in the below and carries sending warehouse (2) and a negative pressure transportation receiving bin (7) that is placed in the top, described malleation carries sending warehouse (2) and negative pressure transportation receiving bin (7) to be provided with the cylindrical shape warehouse of circular cone bucket body for the bottom, described malleation carries sending warehouse (2) and negative pressure transportation receiving bin (7) to advance white butterfly valve (3) and be connected and be coaxially set through being placed in one of centre, described malleation carries the lower end of sending warehouse (2) to connect the powder delivery pipeline (17) of an assembling pipeline valve (1), described malleation carries the top of sending warehouse (2) to be equipped with sending warehouse level sensor (4), pressure sensor (5) and compressed air inlet valve (6), the upper end of described negative pressure transportation receiving bin (7) connects an air filtration storehouse (8), between described negative pressure transportation receiving bin (7) and air filtration storehouse (8), a stationary barrier (9) is set, the pocket type air filter (14) that is placed in negative pressure transportation receiving bin (7) is connected with filter installing port on described stationary barrier (9), the filter anti-blowpipe (13) of being drawn by the filter installing port is connected with a compressed air reservoir (12) by a 2/2-way control cock (11), be equipped with vacuum generator (10) on described air filtration storehouse (8), described negative pressure transportation receiving bin (7) is equipped with receiving bin level sensor (15) and inlet point (16), this inlet point (16) connects a powder inlet pipe road (18), described powder inlet pipe road (18) is equipped with a plurality of powder pressure-bearing two-way valves (19) that advance, described powder delivery pipeline (17) is equipped with a plurality of powder delivery pressure-bearing two-way valves (20).

2. the close phase powder material of positive negative pressure combined type according to claim 1 Pneumatic conveyer, it is characterized in that: described pocket type air filter (14) arranges a plurality of.

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