JP5704981B2 - Tank and sludge collection vehicle equipped with this tank - Google Patents

Description

  The present invention relates to a tank that generates a bubble flow to flow a liquid material, and more particularly, to a sludge collection vehicle equipped with a reaction chamber that performs sludge separation.

Conventionally, manure and the like in ordinary households have been collected in a vacuum car, and then, with the spread of the septic tank, a septic tank cleaning vehicle that transports the septic tank sludge after being concentrated has been put into practical use (for example, Patent Document 1, Patent Document) 2).
And in patent document 1 and patent document 2, performing sludge separation by a bubbling flow is proposed.
In addition, the tank used for a vacuum car generally has an elliptical cross section, and the tank having an elliptical cross section has been widely used for a septic tank cleaning vehicle.
In addition, a tank having a circular cross section has been widely used as a tank in which a pressure difference may occur inside and outside.

JP 2004-100221 A JP 2004-283640 A

However, in the conventional tank having an elliptical cross section, the convection of the bubble flow is not sufficiently formed as compared with the tank having the circular cross section, and it takes a long time for sludge separation.
Further, as a result of analysis by the present inventors, it was found that even in a tank having a circular cross section, convection is not stable over time.

Then, an object of this invention is to provide the tank which can maintain the stable convection by a bubble flow.
It is another object of the present invention to provide a sludge collecting vehicle that can maintain stable convection in a tank and can perform sludge separation by stirring in a short time.

The tank according to the first aspect of the present invention is formed by a barrel portion that is formed in a cylindrical shape and an end plate that closes both ends of the barrel portion, and a bottom portion in the barrel portion extends along the longitudinal direction of the barrel portion. A plurality of air diffuser openings are formed in the air diffuser pipe, a tank that contains a liquid substance and may cause a pressure difference inside and outside the air diffuser pipe, By arranging, a plurality of bubble flows rising from the opening for air diffusion are generated, and the first bubble flow constituting one row generates a flow toward one side body after rising, A flow toward the bottom surface barrel is generated in one of the side surface barrels, and the second bubble flow constituting one row generates a flow toward the other side surface body after floating, A flow toward the bottom barrel is generated at the side barrel Is allowed, by providing at least two said diffuser tube, characterized in that to generate a first of said bubble flow and a second of said bubble flow.
According to a second aspect of the invention, the tank according to claim 1, wherein the body portion has when the vehicle mounted with top body portion located above, and the bottom body portion located below The top surface barrel portion is configured with a top surface curvature Ra, the bottom surface body portion is configured with a bottom surface curvature Rb, and the top surface curvature Ra is configured with a curvature larger than the bottom surface curvature Rb.
According to a third aspect of the present invention, in the tank according to the first aspect , the curvature of the body portion is the same over the entire circumference.
The present invention is claimed in claim 4, wherein, in the tank according to claim 1, wherein the barrel, when the vehicle mounted with top body portion located above, and the bottom body part positioned below the top A pair of side body portions that connect the surface body portion and the bottom surface body portion, the top surface curvature of the top surface body portion and the bottom surface curvature of the bottom surface body portion are configured with the same curvature Ra, and The side surface curvature of the trunk is configured with a curvature Rc different from the curvature Ra.
According to a fifth aspect of the present invention, in the tank according to the second aspect , the top body portion and the bottom surface portion are connected by a pair of side surface portions, and the side surface portion is configured with a side curvature Rc. The side curvature Rc is composed of one or a plurality of curvatures.
A sludge collection vehicle of the present invention according to claim 6 is a sludge collection vehicle equipped with the tank according to any one of claims 1 to 5 , wherein the liquid material is household sludge or industrial waste sludge. It is characterized by sludge.

  According to the tank of the present invention, stable convection can be maintained, and stirring can be performed in a short time.

The side view of the sludge collection vehicle carrying the tank by the 1st example of the present invention The front view and side view which show the external shape of the tank mounted in the sludge collection vehicle by a present Example The figure which shows the tank by a present Example The figure which shows the tank by the 2nd Example of this invention The figure which shows the tank by the 3rd Example of this invention The figure which shows the tank by the 4th Example of this invention The figure which shows the simulation result using the tank by 1st Example of this invention The figure which shows the simulation result using the tank by the 2nd Example of this invention, and the comparative example 1. The figure which shows the simulation result using the tank by the 3rd Example and the comparative example 2 of this invention. The figure which shows the simulation result using the tank by the 4th Example of this invention The graph which shows the simulation result using the tank of 1st Example to 7th Example of this invention, the comparative example 1, and the comparative example 2

The tank according to the first embodiment of the present invention generates a plurality of bubble flows rising from the diffuser openings by arranging a plurality of diffuser openings, and the first bubble flow constituting one row is By generating a flow toward one side body after rising, a flow toward the bottom body is generated in one side body, and the second bubble flow constituting one row is By generating a flow toward the other side body portion, a flow toward the bottom surface body portion is generated in the other side surface body portion, and by providing at least two diffuser tubes, the first bubble flow and the second air bubble are provided. The flow is generated . According to the present embodiment, stable convection can be maintained, and stirring can be performed in a short time. Further, the first bubble flow and the second bubble flow can be stably generated by at least two diffuser tubes.
According to a second embodiment of the present invention, in the tank according to the first embodiment, the body portion includes a top surface body portion positioned above and a bottom surface body portion positioned below when mounted on a vehicle. In addition, the top surface trunk portion is constituted by the top surface curvature Ra, the bottom surface body portion is constituted by the bottom surface curvature Rb, and the top surface curvature Ra is constituted by a curvature larger than the bottom surface curvature Rb. According to the present embodiment, the speed of convection can be increased as compared with a tank having a circular cross section and an tank having an elliptical cross section, and the convection speed is less decreased over time, and the stirring effect is high.
The third embodiment of the present invention is such that in the tank according to the first embodiment, the curvature of the trunk is the same over the entire circumference. According to the present embodiment, there is little decrease in the convection speed over time compared to the case of single bubble flow, and a stable stirring effect can be obtained.
According to a fourth embodiment of the present invention, in the tank according to the first embodiment, when the body is mounted on a vehicle, the body portion is a top surface body portion located above, a bottom surface body portion located below, It has a pair of side body parts that connect the surface body part and the bottom body part, and the top surface curvature of the top surface body part and the bottom surface curvature of the bottom surface body part are configured with the same curvature Ra, and the side surface curvature of the side surface body part Is configured with a curvature Rc different from the curvature Ra. According to the present embodiment, there is little decrease in the convection speed over time compared to the case of single bubble flow, and a stable stirring effect can be obtained.
In the tank according to the second embodiment, the fifth embodiment of the present invention is configured such that the top barrel and the bottom barrel are connected by a pair of side barrels, and the side barrel is configured by a side curvature Rc. The side curvature Rc is composed of one or a plurality of curvatures. According to the present embodiment, the speed of convection can be increased as compared with a tank having a circular cross section and an tank having an elliptical cross section, and the convection speed is less decreased over time, and the stirring effect is high.
The sludge collection vehicle according to the sixth embodiment of the present invention is a sludge collection vehicle equipped with a tank according to any one of the first to fifth embodiments, wherein the liquid material is household sludge, industrial waste sludge, etc. The sludge. According to the present embodiment, sludge separation by stirring can be performed in a short time.

A sludge collection vehicle equipped with a tank according to a first embodiment of the present invention will be described below.
FIG. 1 is a side view of a sludge collection vehicle equipped with a tank according to this embodiment.
A sludge collection vehicle equipped with a tank according to the present embodiment has a boarding cabin 11, a tank 20, and a sludge separator 12 mounted on a vehicle frame 10, and the tank 20 is disposed behind the boarding cabin 11, and the sludge separator. 12 is arranged behind the tank 20.
The inside of the tank 20 is divided into a reaction chamber 20a and a sludge chamber 20b by a partition wall 21. A reaction chamber manhole section 22 is installed above the reaction chamber 20a, and a sludge chamber manhole section 23 is installed above the sludge chamber 20b. A hose reel 13 is installed on the upper portion of the tank 20.

Sludge in septic tanks of general households is divided into scum that floats on the surface, intermediate sewage that is mostly water, and settled sludge that accumulates at the bottom, and the intermediate sewage is mainly contained in the reaction chamber 20a, and scum Sediment sludge is accommodated in the sludge chamber 20b.
Aggregate is added to the intermediate sewage collected in the reaction chamber 20a, and it is vacuum-stirred by bubbling by air blowing to form a floc. Then, the solid-liquid mixed sludge having floc is transferred to the sludge separator 12 and separated into the solid content and moisture of the concentrated sludge, the concentrated sludge is fed to the sludge chamber 20b, and the moisture (separated water) is sent to the septic tank. It is fed as Zhang water.
The tank 20 shown in the present embodiment accommodates sludge such as household sludge and industrial waste sludge, or performs a reaction treatment. During sludge containment or reaction treatment, the tank 20 has a negative pressure inside and outside the tank. A pressure difference occurs. Therefore, the tank 20 needs to have a pressure resistant structure that can withstand a predetermined pressure.

FIG. 2 is a front view and a side view showing the outer shape of the tank mounted on the sludge collection vehicle according to this embodiment.
FIG. 2A is a front view of the tank according to this embodiment, and FIG. 2B is a side view of the tank.
The tank 20 includes a barrel portion 30 formed in a cylindrical shape, and an end plate 40 that closes both ends of the barrel portion 30.
The body part 30 is a pair of side surface body parts 33 connecting the top surface body part 31 and the bottom surface body part 32 to each other when the vehicle body is mounted. It consists of.

The top surface body 31 is composed of a top surface curvature Ra, the bottom surface body 32 is composed of a bottom surface curvature Rb, and the side surface body 33 is composed of a side surface curvature Rc.
Here, the top surface curvature Ra is configured with a curvature larger than the bottom surface curvature Rb, and is configured with a curvature larger than the side surface curvature Rc. Further, the bottom surface curvature Rb is configured with a larger curvature than the side surface curvature Rc.
In the present embodiment, the side surface body portion 33 has one side surface curvature Rc, but the side surface curvature Rc may be configured by a plurality of curvatures.

FIG. 3 is a view showing a tank according to the present embodiment, FIG. 3 (a) is a front view of the tank according to the present embodiment, and FIG. 3 (b) is a side view of the tank. For convenience of explanation, an air diffuser arranged in the tank is shown.
As shown in FIG. 3, an aeration tube 51 is disposed along the longitudinal direction of the body 30 at the bottom of the reaction chamber 20 a of the tank 20. A plurality of diffusers 52 are provided in the lower part of the diffuser pipe 51, and a plurality of diffuser openings 53 are formed in the lower part of these diffusers 52. Here, the diffuser 52 forms a sufficiently large air chamber with respect to the diffuser opening 53, and the diffuser 52 prevents sludge from flowing into the diffuser pipe 51.
The two diffusing pipes 51 are provided symmetrically with respect to the vertical plane M passing through the center of the tank when viewed from the front. Two rows of diffuser openings 53 are arranged by the two diffuser tubes 51, and two rows of bubble flows rising from the diffuser openings 53 can be generated.
The first bubble flow X constituting one row generates a flow toward one side body portion 33X after rising to the sludge water surface L, so that the flow toward the bottom surface body portion 32 in one side surface body portion 33X. The second bubbly flow Y constituting one row is floated on the sludge water surface L and then flows toward the other side body portion 33Y, so that the bottom side body portion is formed on the other side surface body portion 33Y. A flow toward 32 is generated.

FIG. 4 is a view showing a tank according to the second embodiment, FIG. 4 (a) is a front view of the tank according to the present embodiment, and FIG. 4 (b) is a side view of the tank. For convenience of explanation, an air diffuser arranged in the tank is shown. Since the configuration other than the outer shape of the tank is the same as that of the first embodiment, the illustration is omitted and the same configuration is denoted by the same reference numeral.
The tank 120 according to the present embodiment has the same curvature of the body portion 130 on the entire circumference, and has a circular cross section. In the following, for convenience, the body part 130 is divided into four equal parts and described as side body parts 133X, 133Y, and a bottom body part 132, but the curvatures are the same.
As shown in FIG. 4, an aeration tube 51 is disposed along the longitudinal direction of the trunk portion 130 at the bottom of the reaction chamber 20 a of the tank 120. A plurality of diffusers 52 are provided in the lower part of the diffuser pipe 51, and a plurality of diffuser openings 53 are formed in the lower part of these diffusers 52.
The two diffusing pipes 51 are provided symmetrically with respect to the vertical plane M passing through the center of the tank when viewed from the front. Two rows of diffuser openings 53 are arranged by the two diffuser tubes 51, and two rows of bubble flows rising from the diffuser openings 53 can be generated.
The first bubble flow X constituting one row generates a flow toward one side body portion 133X after floating on the sludge water surface L, and thereby flows toward the bottom surface body portion 132 in the one side surface portion 133X. The second bubble flow Y constituting one row is caused to flow toward the other side body portion 133Y after floating on the sludge water surface L, so that the bottom side body portion is formed on the other side surface body portion 133Y. A flow toward 132 is generated.

FIG. 5 is a view showing a tank according to the third embodiment, FIG. 5 (a) is a front view of the tank according to the present embodiment, and FIG. 5 (b) is a side view of the tank. For convenience of explanation, an air diffuser arranged in the tank is shown. Since the configuration other than the outer shape of the tank is the same as that of the first embodiment, the illustration is omitted and the same configuration is denoted by the same reference numeral.
The tank 220 according to the present embodiment has a top body 231 located above, a bottom body 232 located below, and a pair of side body parts 233X and 233Y that connect the top body 231 and the bottom body 232. The top surface curvature of the top surface body portion 231 and the bottom surface curvature of the bottom surface body portion 232 are configured with the same curvature Ra, and the side surface curvatures of the side surface body portions 233X and 233Y are configured with a curvature Rc different from the curvature Ra. doing.
As shown in FIG. 5, an aeration tube 51 is disposed along the longitudinal direction of the body 230 at the bottom of the tank 220 in the reaction chamber 20 a. A plurality of diffusers 52 are provided in the lower part of the diffuser pipe 51, and a plurality of diffuser openings 53 are formed in the lower part of these diffusers 52.
The two diffusing pipes 51 are provided symmetrically with respect to the vertical plane M passing through the center of the tank when viewed from the front. Two rows of diffuser openings 53 are arranged by the two diffuser tubes 51, and two rows of bubble flows rising from the diffuser openings 53 can be generated.
The first bubble flow X constituting one row generates a flow toward one side body portion 233X after floating on the sludge water surface L, so that the flow toward the bottom surface portion 232 in the one side surface portion 233X. The second bubbly flow Y constituting one row is floated on the sludge water surface L and then flows toward the other side body portion 233Y, so that the bottom side body portion is formed in the other side surface body portion 233Y. A flow toward 232 is generated.
In this embodiment, the side body curvatures 233X and Y are set as one side surface curvature Rc, but the side surface curvature Rc may be composed of a plurality of curvatures.

FIG. 6 is a view showing a tank according to the fourth embodiment, FIG. 6 (a) is a front view of the tank according to the present embodiment, and FIG. 6 (b) is a side view of the tank. For convenience of explanation, an air diffuser arranged in the tank is shown. Moreover, since it is the same structure as a 1st Example except having changed the structure of the diffuser tube, it abbreviate | omits illustration and attaches | subjects the same code | symbol to the same structure.
As shown in FIG. 6, an aeration tube 51 is disposed along the longitudinal direction of the body 30 at the bottom of the reaction chamber 20 a of the tank 20. A plurality of diffusers 52 are provided in the lower part of the diffuser pipe 51, and a plurality of diffuser openings 53 are formed in the lower part of these diffusers 52.
One aeration tube 51 is provided on a vertical plane M passing through the center of the tank in a front view. A single row of air diffusion openings 53 is arranged by the single air diffusion pipe 51, and a bubble flow rising from the air diffusion openings 53 can be generated.
After the bubble flow floats on the sludge water surface L, the bubble flow X is separated into a bubble flow X directed to one side body portion 33X and a bubble flow Y directed to the other side surface body portion 33Y. The part 33X generates a flow toward the bottom body part 32, and the bubble flow Y generates a flow toward the other side body part 33Y after rising to the bottom side body part 33Y. Generate a flow.

FIGS. 7A and 7B are diagrams showing simulation results using the tank according to the first embodiment. FIG. 7A shows a state 0.5 seconds after the start of bubbling, and FIG. 7B shows a state 10 seconds after the start of bubbling. FIG. 7C shows the state 20 seconds after the start of bubbling.
In this simulation, the reaction chamber 20a has a capacity equivalent to 2500 liters, the amount of air flowing through the two diffuser tubes is 4000 liters / minute, and the interval between the two diffuser tubes is 360 mm.
As shown in the figure, it can be seen that convection can be generated symmetrically in front view, and the reduction in convection speed with time is small, and the stirring effect is high.

FIG. 8 is a diagram showing a simulation result using the tank according to the second embodiment and the comparative example 1, and FIG. 8A is a state after 0.5 second from the start of bubbling in the tank according to the second embodiment. 8 (b) shows the state 10 seconds after the start of bubbling in the tank, FIG. 8 (c) shows the state 20 seconds after the start of bubbling in the tank, and FIG. FIG. 8 (e) shows the state after 10 seconds from the start of bubbling in the tank, and FIG. 8 (f) shows the state after 20 seconds from the start of bubbling in the tank. Is shown.
In this simulation, the reaction chamber 20a has a capacity equivalent to 2500 liters, the amount of air flowing through the two diffuser tubes is 4000 liters / minute, and the interval between the two diffuser tubes is 240 mm. In addition, the same amount of air is also passed through one diffuser tube in the comparative example.
As shown in the figure, the convection can be generated symmetrically in front view, and the convection velocity is less decreased with the passage of time than in the case of a single bubble flow, and a stable stirring effect can be obtained. .

FIG. 9 is a diagram showing a simulation result using the tank according to the third embodiment and the comparative example 2, and FIG. 9A is a state 0.5 seconds after the start of bubbling in the tank according to the third embodiment. 9 (b) shows the state 10 seconds after the start of bubbling in the tank, FIG. 9 (c) shows the state 20 seconds after the start of bubbling in the tank, and FIG. FIG. 9 (e) shows the state after 10 seconds from the start of bubbling in the tank, and FIG. 9 (f) shows the state after 20 seconds from the start of bubbling in the tank. Is shown.
In this simulation, the reaction chamber 20a has a capacity equivalent to 2500 liters, the amount of air flowing through the two diffuser tubes is 4000 liters / minute, and the interval between the two diffuser tubes is 400 mm. In addition, the same amount of air is also passed through one diffuser tube in the comparative example.
As shown in the figure, the convection can be generated symmetrically in front view, and the convection velocity is less decreased with the passage of time than in the case of a single bubble flow, and a stable stirring effect can be obtained. .

10A and 10B are diagrams showing simulation results using the tank according to the fourth embodiment. FIG. 10A shows a state 0.5 seconds after the start of bubbling, and FIG. 10B shows a state 10 seconds after the start of bubbling. FIG. 10C shows a state 20 seconds after the start of bubbling.
In this simulation, the reaction chamber 20a has a capacity equivalent to 2500 liters, and the amount of air flowing through the diffuser tube is 4000 liters / minute.
Compared with the comparative example 1 shown in FIGS. 8D to 8F and the comparative example 2 shown in FIGS. 9D to 9F, the tank according to the fourth embodiment shown in FIG. 10 is shown in FIG. Thus, it can be seen that convection can be generated symmetrically in front view.

FIG. 11 is a graph showing simulation results using the tanks of the first to seventh examples, comparative example 1 and comparative example 2, where the horizontal axis represents time from the start of bubbling, and the vertical axis represents Convection speed.
In the first embodiment, the interval between the two diffuser tubes is 360 mm, whereas in the fifth embodiment, the interval between the two diffuser tubes is 560 mm, and in the sixth embodiment, the two diffuser tubes The interval is 240 mm, and other conditions are the same as those in the first embodiment.
In the first embodiment, the amount of air flowing through the diffuser tube is 4000 liters / minute, whereas in the seventh embodiment, the amount of air flowing through the diffuser tube is 2500 liters / minute, and other conditions are as follows. This is the same as the embodiment.
As shown in FIG. 11, the tank according to the first embodiment has a larger convection speed and less decrease in convection speed over time than the other embodiments and comparative examples.
The tank according to the second embodiment has a higher convection speed and a smaller decrease in convection speed over time than Comparative Example 1.
Compared with Comparative Example 2, the tank according to the third example has less decrease in convection speed over time.
In the tank according to the fourth embodiment, the convection speed decreases with the passage of time with respect to the rising, but the convection speed is large and the decrease of the convection speed with the passage of time is small compared with Comparative Example 1 and Comparative Example 2. .
Further, according to the fifth and sixth embodiments, at least two diffuser intervals can be obtained in a range of 240 mm to 560 mm, and better results can be obtained than one diffuser tube. It can be seen that two diffuser tubes are superior to one diffuser tube, even if there is a slight variation.
Also, from the first and seventh embodiments, even if the amount of air flowing through the diffuser tube is changed, a better result than that of one diffuser tube can be obtained, and at least one diffuser tube can be obtained. It can also be seen that the two diffuser tubes are superior.
In addition, although the said Example demonstrated using the two diffuser tubes 51, the several diffuser 52 is arrange | positioned so that the diffuser 52 of 2 rows may be formed from the bottom part of the one diffuser tube 51. FIG. Alternatively, the plurality of diffusers 52 may be formed in one row, and two rows of bubble flows rising from the diffuser openings 53 may be generated by the arrangement of the diffuser openings 53.
Moreover, the bubble flow which floats from the opening 53 for aeration may be generated 3 rows or more.

  The present invention can also be used for a tank for storing a liquid material other than sludge as long as it is a tank that generates convection and diffusion due to a bubble flow.

DESCRIPTION OF SYMBOLS 10 Vehicle frame 20 Tank 30 Body part 31 Top surface body part 32 Bottom surface body part 33 Side surface body part 33X Side surface body part 33Y Side surface body part 40 End plate 51 Air diffuser tube 52 Diffuser 53 Air diffuser opening 120 Tank 130 Body part 132 Bottom body part 133X Side surface portion 133Y Side surface portion 220 Tank 230 Body portion 231 Top surface portion 232 Bottom surface portion 233X Side surface portion 233Y Side surface portion M Vertical surface L Sludge water surface X First bubble flow Y Second bubble flow

Claims (6)

It is formed by a barrel portion formed in a cylindrical shape, and an end plate that closes both ends of the barrel portion,
Arrange the aeration tube along the longitudinal direction of the trunk at the bottom of the trunk,
A plurality of diffuser openings are formed in the diffuser;
A tank that contains a liquid and may cause a pressure difference between inside and outside,
By arranging a plurality of the diffuser openings, a plurality of rows of bubble flows rising from the diffuser openings are generated,
The first bubble stream constituting one row is:
By generating a flow toward one side body after floating, a flow toward the bottom body is generated in the one side body,
The second bubble flow constituting one row is:
By generating a flow toward the other side barrel after levitation, a flow toward the bottom barrel is generated in the other side barrel ,
A tank characterized in that the first bubble flow and the second bubble flow are generated by providing at least two diffusion tubes . The body portion has a top body portion located above and a bottom body portion located below when mounted on a vehicle,
The top body is configured with a top curvature Ra, and the bottom body with a bottom curvature Rb.
The tank according to claim 1 , wherein the top surface curvature Ra is configured to have a larger curvature than the bottom surface curvature Rb. The tank according to claim 1 , wherein the curvature of the body portion is the same over the entire circumference. When the vehicle is mounted on a vehicle, the body includes an upper surface body portion located above, the bottom surface body portion located below, and a pair of side surface body portions connecting the top surface body portion and the bottom surface body portion. Have
The top surface curvature of the top surface body and the bottom surface curvature of the bottom surface body are configured with the same curvature Ra,
The tank according to claim 1 , wherein a side curvature of the side body portion is configured with a curvature Rc different from the curvature Ra. Connecting the top body and the bottom body with a pair of side bodies;
The side body is configured with a side curvature Rc,
The tank according to claim 2 , wherein the side curvature Rc is composed of one or a plurality of curvatures. A sludge collection vehicle equipped with the tank according to any one of claims 1 to 5 ,
The sludge collection vehicle characterized in that the liquid material is sludge such as household sludge and industrial waste sludge.