JP3205053B2 - Pulse jet type dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
It is used in the technical field of a pulse jet type dust collector in which accumulated dust is removed by blowing compressed air into the bag filter.Specifically, compressed air blown into the bag filter is used. The present invention relates to a pulse jet type dust collector devised so as to exhibit an excellent dust removing effect by increasing the amount of dust.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 4-6810, for example, a conventional pulse jet type dust collector has a venturi in which an injection hole (nozzle) of a blow pipe for injecting compressed air is attached to an upper end of a bag filter. One is formed toward the center of the bag filter, and the dust adhering to the bag filter is blown off by compressed air injected into the venturi from the injection hole to remove the dust.

FIG. 4 shows the structure of a main part of the above-mentioned conventional pulse jet type dust collector, in which P is a blow pipe, Pa is an injection hole formed in the blow pipe P,
F is a bag filter attached to the partition plate 1a in the dust collection chamber, 1
Reference numeral 0 denotes a venturi attached to the upper end of the bag filter F. The injection hole Pa of the blow pipe P is opened toward the center of the inlet 10a opened at the upper end of the venturi 10, and compressed air is supplied to the venturi. It is configured so that it can be injected into the Venturi 10.

In the conventional pulse jet type dust collector constructed as shown in FIG. 4, the amount of compressed air injected from the injection hole Pa is Q1, the amount of air induced from the surroundings is Q2, and the Venturi 1
Assuming that the amount of air discharged from the lower end outlet 10b of 0 is Q3, Q3 = Q1 + Q2, and the ratio of the induced air amount Q2 to the compressed air amount Q1 to be injected is proportional to the injection speed ν. .

Therefore, in the above-mentioned pulse jet type dust collector, if the amount of induced air Q2 is increased, the venturi 10
It is clear that the amount of air Q3 discharged from the nozzle can be increased and an excellent dust removing effect can be exhibited. Further, in order to increase the amount of the induced air Q2, the hole diameter of the injection hole Pa is increased and the compressed air is increased. It can be easily understood that if the surface area of the cone S1 is increased by enlarging the area of the cone S1 from which the air is injected, the amount of air to be drawn from the surroundings can be increased to increase the amount of the drawn air Q2.

[0006]

However, when the pressure (air pressure) of the compressed air applied to the blow pipe P is the same, the flow velocity ν of the injected compressed air increases as the diameter of the injection hole Pa increases. Since it gradually becomes slower, the attraction efficiency decreases and the amount of induced air Q2 decreases accordingly, the blow-pipe must be used to increase the amount of induced air Q2 and increase the amount of discharged air Q3 by increasing the injection hole Pa. Since it is necessary to greatly increase the pressure (amount) of the compressed air supplied to P, there is a problem that a large and powerful air pump is required and an economic burden such as an increase in consumption of electric energy is increased. there were.

[0007] Therefore, the technical problem of the present invention is that only the conical surface area can be obtained without unnecessarily increasing the pressure of the compressed air supplied to the blow pipe and without reducing the speed of the compressed air injected from the injection hole. Is to increase the amount of induced air by increasing the total amount of air discharged at the venturi outlet, thereby exhibiting an excellent dust removing effect.

[0008]

Means taken by the present invention to solve the above-mentioned technical problems are as follows. The blow hole of the blow pipe that injects compressed air is opened toward the center of the venturi attached to the upper end of the bag filter, and the dust adhering to the bag filter is blown off by the compressed air injected into the inside of the venturi from the injection hole. in pulse-jet dust collector that is configured to dust, (1) the bottom surface of the blowpipe, be drilled side by side injection holes of the two left and right in one set towards the inlet of the venturi. (2) which like the sum of the areas of both the injection holes, that same formed with the area of in injection holes in the case of providing only one toward the center of the venturi.

[0009]

The above means operates as follows. According to the element (1), the compressed air is supplied to the bottom surface of the blow pipe .
For injecting side by side in direction from the injection holes of the two left and right in a set of bored into the inlet of the venturi to make it possible to the surface area of the conical compressed air to substantially twice that of the injection hole one .

According to the element (2), the sum of the areas of the two injection holes is made the same as the area of the conventional injection hole where one is drilled, so that the air pressure applied to the blow pipe is reduced. In the same state, the speed of the compressed air injected from the two injection holes can be kept equal to the speed of the compressed air injected from the one injection hole, so that the conical surface area is almost doubled. As a result, the amount of air induced from the surroundings is increased to increase the total amount of air at the outlet of the venturi, thereby enabling an excellent dust removal effect to be exhibited. As described above, the technical problems described above can be solved by the above means, and the problems of the conventional technology can be solved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-described pulse jet type dust collector according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram illustrating an internal structure of a pulse jet type dust collector according to the present invention. In the drawing, reference numeral 1 denotes a main body of the dust collector; An exhaust duct 4 leading to a suction blower (not shown) is connected to the clean room 2, a suction duct 5 for sucking the dust DS is connected to the dust collection room 3, and a dust collection room. A hopper 1b for accommodating the dust DS is provided continuously below 3, and a rotary valve 1c for discharging the dust is provided at an outlet of the hopper 1b. The hopper 1b accommodates the dust DS instead of the hopper 1b. A drawer type bucket (not shown) may be provided.

Numerals 7 are bag filters suspended in the dust collecting chamber 3 by attaching the upper end to the above-mentioned partition plate 1a. Numerals 6 are filter gauges accommodated in the respective filters 7. , Denotes a venturi attached to the upper end of each of the filters 7,..., 8 denotes a blowpipe laid in the clean room 2 above, 9 denotes a header pipe for sending compressed air to the blowpipe 8, and The bottom of the blow pipe 8 is located on the left side of the venturi 10 of each bag filter 7.
A set of injection holes 8a and 8b are formed in a row at the right two sides, and compressed air injected from each injection hole 8a and 8b is blown toward the inlet 10a of each venturi 10 as shown in FIGS. In addition, the dust is discharged from the outlet 10b at the lower end into the inside of the bag filter 7 to blow off dust.

As described above, the total area of the two injection holes 8a and 8b formed as one set is equal to one injection hole formed in the blow pipe P of the conventional pulse jet type dust collector described with reference to FIG. It is formed to have the same area as Pa.
Therefore, when the air pressure applied to both the blow pipes 8 and P is the same, the surface area of the conical shapes S2 and S2 of the compressed air injected from the two injection holes 8a and 8b of the present invention is one of the conventional example. Since the surface area of the conical shape S1 of the compressed air injected from the injection hole Pa is twice as large and the injection speed ν can maintain the same speed as in the case of the single injection hole Pa, in the present invention, Induced air volume Q2 compared to the one
Is increased twice, so that the discharge air amount Q3 at the outlet 10b of the venturi 10 is increased, so that an excellent dust removing effect can be exhibited.

Incidentally, when the diameter of one injection hole Pa of the conventional example shown in FIG. 4 is 8.7 mm, the diameter of each set of two injection holes 8a and 8b of the present invention is approximately 6.2 mm.
Then, the areas of both the injection holes Pa and 8a + 8b become the same. That is, the area of the injection hole Pa is (π × 4.352).
And the area of the injection holes 8a, 8b is (π × 3.07
62) × 2, so any area is 59.4.
5 mm2. However, the surface areas of the conical shapes S1 and (S2 × 2) injected from both the injection holes Pa and 8a and 8b are naturally larger than S1 <S2 × 2 and the set of two is larger, so that the induced air amount Q2 Can also be raised.

FIG. 5 is a curve diagram showing the relationship between the theoretical injection air amount and the injection speed when the conventional pulse jet type dust collector shown in FIG. 4, that is, when there is one injection hole (nozzle). From this curve diagram, the maximum injection speed is 179 m / sec.
c, the discharge air amount at the outlet 10b of the venturi 10 is expected to have a peak in the range of 166 to 179 m / sec. ) To increase the amount of compressed air and to increase the area of the cone S1, the injection speed decreases as is apparent from the curve diagram of FIG. , Venturi Exit 10
It is clear that the effect is rather opposite for the discharge air amount Q3 of b.

FIG. 6 shows the theoretical jet air amount and jet speed when the pulse jet type dust collector according to the present invention shown in FIGS. 2 and 3 is constituted by two sets of jet holes (nozzles). FIG. 5 is a curve diagram showing the relationship. In the curve diagram of FIG. 5 described above, if the nozzle diameter is 8.7 mm in the case of one conventional nozzle, the test machine uses a jet air amount of 85 N
1 / sec and the injection speed of 178 m / sec, whereas in the case of one set of two nozzles of the present invention, the position where the injection air amount is 85 Nl / sec in the curve diagram shown in FIG. The diameter is approximately 6.2 mm, and the injection speed is 17
There is no change at 8 m / sec. In the case of the actual model,
FIG. 5 shows a single nozzle having a hole diameter of 8.7 mm.
The injection air amount is 73 Nl / sec and the injection speed is 154 / sec from the curve diagram of FIG. 6, whereas in the case of two nozzles, the position of 73 Nl / sec in the curve diagram of FIG. At 6.2mm, the injection speed is 154.5
m / sec, it can be considered that there is no change. Therefore, according to the two sets of injection holes 8a and 8b according to the present invention, the compressed air discharge amount at the venturi outlet 10b is increased at the same air pressure. It was found that an excellent dust removing effect can be exhibited.

[0017]

As described above, according to the pulse jet type dust collector of the present invention, the blow pipe is provided with two sets of compressed air injection holes per venturi. The amount of compressed air discharged from the venturi outlet by doubling the amount of induced air at the same air pressure by simply making the total area of the two injection holes equal to the area of the conventional one injection hole Therefore, a large amount of compressed air can be blown into the inside of the bag filter without consuming unnecessary energy, so that an advantage of exhibiting an excellent dust removing effect can be exhibited.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an internal structure of a pulse jet type dust collector according to the present invention.

FIG. 2 is a front sectional view showing a main part of the present invention.

FIG. 3 is a front sectional view illustrating a state of injection of compressed air in a main part of the present invention.

FIG. 4 is a front sectional view illustrating a state of compressed air injection in a conventional example.

FIG. 5 is a curve diagram showing a theoretical relationship between an injection air amount and an injection speed in the case of a single nozzle (injection hole) according to a conventional example.

FIG. 6 is a curve diagram showing a relationship between a theoretical injection air amount and an injection speed in the case of two nozzles (injection holes) according to the present invention.

[Explanation of symbols]

 7 Bag filter 8 Blow pipe 8a, 8b 2 sets of injection holes 10 Venturi 10a Inlet 10b Outlet Pa Conventional injection holes

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP 4-8978 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 46/00-46/54

Claims (1)

(57) [Claims] An injection hole of a blow pipe for injecting compressed air is opened toward the center of a venturi attached to an upper end of a bag filter, and adheres to the bag filter by compressed air injected from the injection hole into the inside of the venturi. It was at the pulse jet dust collector constructed as to blow the dust to dust removal, the bottom surface of the blowpipe, bored side by side injection holes of the right and left 2 Tsude set toward the inlet of the venturi, which like the sum of the areas of both the injection holes, the pulse jet dust collector, characterized in that it has the same configured as area in injection hole in the case of providing only one toward the center of the venturi.