JPH0723698Y2 - Laminar flow element - Google Patents

Description

[Detailed Description of the Device] A. Field of Industrial Application This device is used for forming a laminar flow in the flow of a fluid provided in a flow path system or for measuring the flow rate from the differential pressure before and after the flow. The present invention relates to a laminar flow element.

B. Conventional technology A laminar flow element is provided in a flow channel system (flow channel conduit) to cause a laminar flow to appear, but such an element body has a certain length in the flow channel direction. The element body, for example, a cylindrical body made of a metal material or a resin material, is formed by forming a plurality of pores (usually a large number) in the flow path direction.
In order to solve this problem due to the difficulty of drilling holes, for example, as shown in JP-A-60-14121 "Laminar flow element", a plate in which a number of holes are aligned and drilled is used. It has been proposed to form a laminar flow element by stacking a predetermined number of layers. The holes in the laminated laminar flow element component plate are processed by, for example, etching to facilitate the processing.

Further, a device in which a plurality of thin tubes are provided through the element body has been proposed.

C. Problems to be Solved by the Invention Even though the conventional laminar flow element has the function of causing laminar flow to appear in the flow path, it has various problems in its assembly structure.
There is also a problem when adjusting the function as an element. That is, in the case of the above-proposed laminated element, it is necessary to assemble a large number of plates with the holes aligned in phase, which requires skill and time. It is also expensive. In addition, the number of pores in the conventional ones, including those of the laminated type, is fixed. Therefore, if you want to change the number of pores due to changes in the laminar flow state and the purpose of use, it is necessary to replace with a new element body. There is. It is also economically disadvantageous. In the case where multiple thin tubes are pierced in the element body, the element body itself is made of a metal material, etc.Therefore, by providing a plurality of pores in the element body itself, piercing the thin tube and soldering it. It is stuck. Therefore, it has a drawback that once manufactured, it cannot be extracted, and when it is increased in number, it cannot be immediately pierced.

D. Means for Solving the Problems This invention is to provide a laminar flow element for solving the above-mentioned problems, and the main body of the laminar flow element can be arbitrarily inserted / removed by a thin tube and is airtight after the removal. An airtight body (hereinafter simply referred to as an airtight body) made of a material that can be restored is made of, for example, a rubber material, and the pores are made of thin tubes. Then, the thin tube is inserted into the soft airtight body to form a laminar flow element.

E. Action The main body (matrix) is an airtight body, and the number of thin tubes inserted can be changed and adjusted arbitrarily. When the thin tube is inserted, the airtightness of the contact portion between the outer peripheral portion of the thin tube and the airtight body can be maintained.

F. Embodiment The present invention will be described below according to an embodiment shown in the drawings.

FIG. 1 is a sectional view showing a state in which a laminar flow device SD equipped with a laminar flow device SB according to the present invention is provided in a flow path system 4, and FIG. It is a perspective view shown. In these figures, reference numeral 1 denotes a rubber material, for example, a soft airtight body such as silicon rubber, which has a constant length in the flow path direction and has the same outer shape as the inner cross section of the flow path 4 (a cylinder in the illustrated example). There is. Reference numeral 2 denotes a holding ring body for accommodating and holding the soft airtight body 1 inside, and has a connection mechanism 2H for connecting to the flow path 4. Reference numeral 3 is a thin tube (capillary) having a length equal to or longer than the length of the soft airtight body 1 as shown in the drawing, and is inserted into the soft airtight body 1. The number of the thin tubes 3 is not limited, but is usually a large number depending on the purpose of use. In the illustrated example, the number is around 10, but it may be used with several. In order to make it easy to insert the thin tube 3 into the soft airtight body 1, the soft airtight body 1 is provided with an insertion portion 1H in advance. The insertion portion 1H is formed by inserting the airtight body 1 in advance with a needle (not shown) thinner than the thin tube 3, for example. Of course, since the airtight body 1 is soft, as long as the thin tube 3 is not inserted, both sides of the airtight body 1 do not communicate with each other via the insertion portion 1H.
This insertion portion 1H does not necessarily have to be provided and may be unnecessary depending on the softness of the airtight body 1. Therefore, as shown in FIG. 2, the thin tube 3'is not inserted, but in this case, it is closed by the softness of the airtight body 1 as shown in FIG. When such a laminar flow element SB is used, the differential pressure on both sides is experimentally investigated while changing the flow rate by changing the number of the thin tubes 3 inserted, and the relationship between the flow rate and the differential pressure is proportional as shown in FIG. It became clear. The features of the present invention are as described above, but the present invention is not limited to the above and illustrated examples and includes various modifications. For example, the number of thin tubes can be any number and the thickness can be freely set. It is also possible to use a plurality of types of thin tubes having different inner diameters in combination. This invention covers all these variants.

G. Effect of the Invention Since the invention has been described in detail above, it provides a laminar flow element that has an extremely simple structure and is therefore easy to manufacture and inexpensive. Moreover, the characteristics of the laminar flow element can be freely changed and adjusted by inserting and removing the thin tube. It can be widely used as a laminar flow generator or as an element of a differential pressure type flow meter. Even after removing the thin tube, the airtightness of the main body of the element is restored, so that the function as a laminar flow element is maintained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a laminar flow device using the laminar flow element according to the present invention is provided in a flow path system, and FIG. 2 is a perspective view showing an appearance of the laminar flow element according to the present invention, and FIG. FIG. 4 is a sectional view of the laminar flow element of FIG. 2, and FIG. 4 is a diagram showing characteristics of the laminar flow element according to the present invention. SB ... Laminar flow element, SD ... Laminar flow device 1 ... Holding ring body, 2 ... Airtight body 3 ... Capillary tube

Claims (1)

[Scope of utility model registration request] 1. An airtight body made of a material which can be arbitrarily inserted and removed and whose airtightness is restored after removal is provided in a flow path system, and a plurality of thin tubes flow through the airtight body. A laminar flow element characterized by being configured to be inserted in the direction.