JPH02293035A - Mixer - Google Patents

Abstract

PURPOSE:To reduce the pressure difference between the spaces of casing side and vibration source side by hermetically partitioning the space of vibration source side from the space in the casing with diaphragms and keeping the space of vibration source side in a pressurized state. CONSTITUTION:An influent opening 12 and an effluent opening 14 are formed in both end parts of the cylindrical casing 10. The agitating body 20 formed on an axially elongated shaft part 22 is housed in the casing 10. The vibration source 30 vibrating the agitating body 20 reciprocatingly in the axial direction is connected with the elongated shaft part 22. Diaphragms 62, 64 which partition hermetically the space of the side of the vibration source 30 from the space in the casing 10 are fixed on the shaft part 22 elongated from the agitating body 20 are provided in the connection part 60 connecting the casing 10 with the vibration source 30. The space of the diaphragm of vibration source side is kept in a pressurized state. As a result, the pressure difference between the spaces of casing side and vibration source side is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a mixing device that promotes mixing of fluids, and a mixing device, particularly one for mixing high-pressure fluids.

[Prior Art] Conventionally, various types of stirring and mixing devices have been used in pH adjustment, redox reactions, and chemical reactions.

Furthermore, with the recent development of biotechnology, the importance of stirring and mixing in biological fields such as microbial culture has increased.

Static mixers are widely used as devices for performing such liquid-liquid mixing and gas-liquid mixing. In this static mixer, stirring bodies of various shapes are arranged in a vibrator through which a mixture of multiple types of fluids to be mixed flows, and the mixing of the fluids is promoted by the turbulent flow generated by the stirring bodies. Specifically, a pipe in which a stirrer such as a cut screw is placed inside the pipe is used.

Furthermore, the stirring body placed inside the vibrator is attached to one shaft,
It has also been proposed to make this vibrate back and forth to promote mixing.

When the stirring body is vibrated in this manner, the fluid in contact with the surface of the stirring body repeatedly collides with the surface, and very effective mixing can be achieved.

However, in order to vibrate a stirring body disposed in a casing through which fluid flows, the stirring body must be connected to some kind of vibration source. Examples of the vibration source include a motor cam mechanism, and conventionally, a stirring body is directly connected to such a vibration source to cause the stirring body to vibrate back and forth.

When the stirring body disposed inside the casing and the vibration source are connected, the inside of the casing and the vibration source are spatially connected. Therefore, it is necessary to take some means to prevent the fluid flowing within the casing from flowing into the vibration source side.

Conventionally, therefore, the vibration source is installed sufficiently above the casing to prevent the fluid from entering the vibration source, the shaft connecting the vibration source and the stirring body is partitioned off with a mechanical seal, or the movement of the shaft is absorbed. The space on the vibration source side is partitioned off from the inside of the casing by providing a diaphragm that can be used to prevent fluid flowing through the casing from entering the vibration source side.

[Problems to be Solved by the Invention] However, when high-pressure fluid flows inside the casing, sufficient sealing cannot be achieved using conventional methods, and a portion of the fluid flowing inside the casing may vibrate. There was a problem in that it invaded the source side.

In other words, in the method in which the vibration source is provided above, 1
kg/cm2 and requires a height of 10 m, which is completely unrealistic. Further, in a method using a mechanical seal, a considerably large and expensive seal is required in order to withstand a pressure of several kg/am2. moreover,
In a system that uses a diaphragm, if the diaphragm is made thinner and has a greater tolerance for movement, the diaphragm will be destroyed by pressure, and if it is made to be able to withstand high pressure, it will not be able to adequately tolerate the movement of the agitator. There was a problem.

The present invention has been made to solve the above-mentioned problems, and relates to a mixing device that can effectively separate a vibration source from a high-pressure fluid.

[Means for Solving the Problem] The mixing device according to claim (1) includes a cylindrical casing having an inlet and an outlet formed at both ends thereof, and a shaft portion coaxially housed within the casing. A stirring body extending in the axial direction, a vibration source connected to the extended shaft and reciprocating the stirring body in the axial direction, and a rib extending from the stirring body at the connection between the casing and the vibration source. is fixed to
It is characterized in that it includes a diaphragm that airtightly partitions the space inside the casing and the space on the side of the vibration source, and that the space on the side of the vibration source of the diaphragm is maintained in a pressurized state.

The mixing device according to claim (2) includes a pressure detection means for detecting the pressure inside the casing, and a pressure adjustment means for adjusting the pressure in the vibration source side space according to the pressure detection result of the pressure detection means. It is characterized in that the pressure in the vibration source side space is adjusted according to the pressure inside the casing.

[Function] Since the stirring body is vibrated by the vibration source while the fluid to be mixed is flowing through the casing, the mixing process is promoted by the action of the stirring body, and the mixing process is performed effectively.

In this invention, the space inside the casing and the space on the side of the vibration source are partitioned by a diaphragm, and the space on the side of the vibration source is pressurized. Therefore, the pressure applied to the diaphragm is the difference between the fluid pressure and the vibration source side pressure.

Therefore, even if the pressure of the fluid is quite high, the pressure applied to the diaphragm can be reduced, and the diaphragm can partition the inside of the casing from the vibration source side.

In addition, by adjusting the pressure in the vibration source side space according to the pressure inside the casing, the pressure applied to the diaphragm can be reduced to a predetermined level, and the diaphragm can more effectively connect the inside of the casing and the vibration source side space. Partitions can be done.

[Example] Hereinafter, a method for manufacturing a mixing device and a mixing device according to the present invention will be described based on the drawings.

FIG. 1 is an overall configuration diagram showing the right half of the mixing device according to the present invention as a sectional view.

In the figure, a casing 10 is formed into a cylindrical shape, and its lower opening is an inlet 12. Further, an outflow port 14 is formed in the upper part of the casing 10,
The fluid that flows in from the inlet 12 passes through the casing 10 and is discharged from the outlet 14.

On the other hand, a stirring body 20 is inserted into the casing 10 . This stirring body 2o consists of a shaft portion 22 and a spiral blade 24.

The shaft portion 22 extends upward from the casing 1o and is connected to the vibration source 30.

The vibration source 30 includes a pair of motors 4o and a cam mechanism 50 attached to an output shaft 42 of the motors 40.

The cam mechanism 50 includes a rotating section 52 to which the output shaft 42 is attached eccentrically, and a swinging section 54 that swings due to the eccentric rotation of the rotating section 52. Therefore, the rocking motion of the rocking portion 54 is transmitted to the shaft portion 22 via the connecting portion 56 as vertical vibration.

In addition, the connection portion 60 between the casing 10 and the vibration source 30 includes
Two diaphragms 62 , 64 are provided to prevent fluid flowing within the casing 10 from penetrating towards the vibration source 30 .

Here, the two diaphragms 62 and 64 are connected by a vibration-like connecting member 40 so that they can move together over a certain range, and the upper diaphragm 64 is directed downward under a predetermined pressure by a biasing member 72. is energized. Therefore, even if the pressure inside the casing 10 increases to some extent, it can be counteracted by the biasing force of the biasing member 72.

The biasing member 72 includes a screw 74 and a spring 76, and the biasing force can be adjusted by moving the screw 74.

In the mixing device having such a configuration, when mixing is performed, a mixture of two or more types of fluids to be mixed flows through the inlet 12 and flows through the casing 10 toward the outlet 14 .

In this state, the stirring body 20 is vertically vibrated by the vibration source 30. Therefore, the fluid flowing within the casing 10 is sufficiently mixed by contact with the vibrating agitator 20.

Here, what is characteristic about this embodiment is that the space on the vibration source 30 side, which is partitioned from the inside of the casing 1θ by a diaphragm, is formed airtight and can be maintained in a pressurized state.

That is, in this embodiment, diaphragm 62.
A space 80 between the pipes 64 is formed airtight, and one end of a pressurizing pipe 82 is connected thereto. A compressor 84 is provided at the other end of this pressurizing pipe 82.
is connected.

Therefore, pressurized air from the compressor 84 is transferred to the space 80.
By introducing the gas into the space 80, the inside of the space 80 can be pressurized.

An automatic adjustment valve 86 is provided in the pressurizing pipe 82 extending from the compressor 84 to the space 8o. Therefore, by adjusting the opening degree of this automatic adjustment valve 86, the amount of air introduced from the compressor 84 into the space 80 can be adjusted, and the pressure in the space 80 can be maintained at a predetermined level.

Further, in this embodiment, the adjustment of the opening degree of the automatic adjustment valve 86 is controlled by a signal from the regulator 9o,
The signal from the regulator 9o is generated in response to a signal from a pressure transducer 94 that operates in response to a pressure detection value from a pressure sensor 92.

$-r. That is, the pressure sensor 92 is attached to the lower part of the casing 10 so as to be able to detect the fluid pressure inside the casing lo. Therefore, the pressure of the fluid flowing inside the casing 10 can be detected by the pressure sensor 92.

This detected value is then co-supplied to a pressure converter 94, where the characteristics of the pressure sensor 92 and the like are corrected and converted into a signal corresponding to a pressure value as a physical quantity. When this is supplied to the regulator 90, the regulator 90 adjusts the opening degree of the regulating valve 86 so that the pressure in the space 80 is equal to the pressure in the casing 10.

Therefore, the pressure in the casing lO and the pressure in the space 80 are approximately equal, and the pressures on both sides of the diaphragm 62 are approximately the same, achieving a situation similar to that in which no pressure is applied to the diaphragm. . Therefore, even if the strength of the diaphragm 62 is considerably weak and the amount of deformation is large, the risk of damage to the diaphragm 62 is extremely small. For this reason, the diaphragm 62 sufficiently follows the shaft portion 22 of the stirring body 20, and the inside of the casing 10 and the vibration source 30
You can securely separate it from the sides.

In order to accurately control the pressure in the space 80, it is preferable to detect the pressure in the space 80 and thereby control the opening degree adjustment of the automatic adjustment valve 86 in feedback.

Further, a pressure difference between the space 80 and the vibration source 30 side is applied to the diaphragm 64, but the casing 10
Since the pressure inside the diaphragm 64 can be predicted to some extent, a considerable amount of pressure can be borne by the biasing member 72 and damage to the diaphragm 64 can be prevented.

Next, FIG. 2 shows another embodiment of the present invention, in which the entire vibration source 30 is covered by a pressurizing case 100. According to this embodiment, the entire space 102 surrounding the vibration source 30 can be brought into a predetermined pressurized state, and the pressure applied to the diaphragms 62, 64 can be made very small.

Note that in this embodiment, the pressure within the space 102 can be adjusted in the same manner as in the above embodiment.

[Effects of the Invention] As explained above, according to the mixing device according to the present invention, since the vibration source side can be pressurized, the pressure difference between the casing side and the vibration source side space can be reduced. Therefore, the two spaces can be effectively partitioned by the diaphragm through which the vibrating shaft passes. Furthermore, if the pressure in the vibration source side space is controlled according to the pressure in the casing, the pressure applied to the diaphragm can be further reduced.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing the overall configuration of a mixing device according to the present invention, and FIG. 2 is a configuration diagram showing the overall configuration of another embodiment. 10...Casing l2...Inlet 14...Outlet 20...Agitator 22...Shaft vibration source...Diaphragm compressor automatic adjustment valve pressure sensor

Claims (2)

[Claims] (1) A cylindrical casing with an inlet and an outlet formed at both ends; a stirring body coaxially housed within this casing and having a shaft extending in the axial direction; A vibration source is connected to the vibration source that reciprocates the stirring body in the axial direction, and the vibration source is fixed to the shaft extending from the stirring body at the connection point between the casing and the vibration source, making the space inside the casing and the space on the vibration source side airtight. A mixing device comprising: a partitioning diaphragm; and maintaining a space on the vibration source side of the diaphragm in a pressurized state. (2) In the mixing device according to claim (1), a pressure detection means for detecting the pressure inside the casing; and a pressure for adjusting the pressure in the vibration source side space according to the pressure detection result of the pressure detection means. A mixing device, comprising: an adjusting means, and adjusting the pressure in the vibration source side space according to the pressure in the casing.