JPH0131228Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drain for adjusting the flow rate of fluids such as blood and medicinal solutions in a liquid delivery tube during blood transfusions, intravenous drips, and the like.

(Prior Art) Conventionally, guide grooves that movably support the shaft of a suppression roller are provided along the inner surfaces of both side walls of a housing having an insertion passage through which a flexible liquid feeding tube is inserted. , the guide groove and the bottom of the insertion passage are gradually brought closer to each other in the direction of movement of the roller, and the roller is rotated and moved forward to compress and deform the liquid feeding tube, thereby deforming the fluid in the liquid feeding tube. A cleaner that adjusts the flow rate is known (see Japanese Patent Publication No. 48-36526).

In this conventional clamping method, relatively coarse knurls are formed on the circumferential surface of the suppression roller parallel to the axial direction of the roller, and since the liquid feeding pipe digs deeply into the valleys of the knurls, the circumferential surface of the roller The entire suppressed portion of the liquid feeding tube by the bottom surface of the insertion passage is no longer uniformly suppressed, resulting in an inconvenience that the flow rate becomes unstable.

Therefore, in order to eliminate this inconvenience, it may be possible to make the pitch of the knurling relatively thin, but in this case, the frictional force between the circumferential surface of the suppression roller and the liquid feeding pipe will be reduced, and the roller will This has the disadvantage of causing the liquid to slide on the liquid pipe, resulting in poor operability.
Therefore, in either case, there was a problem in that the flow rate could not be adjusted accurately.

(Means for solving the problem) The present invention was devised in an attempt to provide a simple drain that can accurately adjust the flow rate of fluid in the liquid sending pipe. A guide groove for movably supporting the shaft of the suppression roller is provided along the insertion passage facing the inner surface of both side walls of the housing having an insertion passage to be inserted, and the guide groove and the bottom surface of the insertion passage are connected to each other along the insertion passage. In the roller that approaches the roller gradually in the direction of movement, the circumferential surface of the suppression roller is provided with a knurling that is inclined with respect to its axial direction.

(Example) Next, the present invention will be explained based on the illustrated embodiments.

In FIG. 1, reference numeral 1 indicates an insertion passage through which a flexible liquid feeding tube a made of rubber or the like is inserted. 1, guide passages 2, 2 each having a U-shaped cross section are arranged in series with their openings facing each other, and rollers 3 are used to suppress the liquid feeding pipe a into guide grooves 2a, 2a of both guide passages 2, 2. Both ends of the shaft 4 are movably fitted, and the bottom surface of the insertion passage 1 is formed to be gradually higher in the direction of movement of the roller 3.
When the roller 3 is rotated and moved forward, the liquid feeding tube a is deformed while being suppressed by the circumferential surface of the roller 3 and the bottom surface of the insertion passage 1, and its cross-sectional area is gradually reduced. The flow rate can be adjusted.

The above configuration is not particularly different from the conventional one, but according to this, when suppressing the liquid feeding pipe a, a reaction force from the liquid feeding pipe a acts on the roller 3, and the guide passage 2, which has a U-shaped cross section, , 2 openings may expand upward, making the flow rate of fluid unstable. Therefore, in the illustrated example, in order to prevent the openings from expanding, an insertion passage is provided at the lower end of the guide passages 2, 2. A reinforcing frame 5 having a U-shaped cross section and an open upper surface is provided in series so as to cover the reinforcing frame 5 and the insertion passage 1, and the reinforcing frame 5 and the insertion passage 1 are connected by a rib 6, thereby forming a housing 7.

Here, in the present invention, a knurling 8 is provided on the circumferential surface of the roller 3, which is inclined with respect to the axial direction. Specifically, the knurling 8 is inclined downwardly to the left with respect to the axial direction as shown in the second figure. , or as shown in the third figure, one half is sloped downward to the left and the other half is sloped downward to the right, so that the whole is shaped like a mountain.

(Function) The present invention has the above-mentioned configuration, and since the peripheral surface of the suppression roller 3 is provided with the knurling 8 which is inclined in the axial direction, the knurling is provided to prevent the roller 3 from slipping on the liquid feeding pipe a. Even if the pitch of 8 is made relatively coarse, when the roller 3 that adjusts the flow rate of the fluid in the liquid feeding pipe a is rotated, the liquid feeding by the circumferential surface of the roller 3 and the bottom surface of the insertion passage 1 is prevented. Since the entire suppressing portion of the pipe a is suppressed by the plurality of peaks of the knurling 8, the suppressing portion does not dig into the valley portions of the knurling 8, and the entire suppressing portion is uniformly suppressed. The flow rate is always stable and can be precisely adjusted to the desired value.

In the illustrated example, the cross-sectional shape of the circumferential surface of the suppression roller 3 is formed into an arc shape, and the cross-sectional shape of the bottom surface of the insertion passage 1 is formed into a parabolic shape along the liquid feeding pipe a. When the liquid feeding tube a is suppressed by the surface and the bottom surface of the insertion path 1, the upper surface of the liquid feeding tube a deforms into an arc shape along the circumferential surface of the roller 3, and the lower surface of the liquid feeding tube a deforms into an arc shape along the circumferential surface of the roller 3. deforms in a parabolic shape along the bottom surface of the flow path, and the flow path inside the flow path deforms into a substantially U-shape, so that part of the flow path is not blocked within the allowable flow rate adjustment range, and is always stable. It is possible to obtain a high flow rate.

(Effect of the invention) As described above, according to the present invention, since the peripheral surface of the roller that suppresses the liquid feeding pipe is provided with a knurling that is inclined with respect to the axial direction, the roller can be rotated to move the roller to press the inside of the liquid feeding pipe. When adjusting the flow rate of the fluid, the roller does not slip on the liquid feed pipe, and the liquid feed pipe does not dig into the valley of the knurling, so that the flow rate can be maintained at all times. It can be adjusted accurately and is fully applicable to drip infusions, etc., where changes in flow rate are undesirable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the implementation of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a
FIG. 7 is a cross-sectional view showing a modification of the figure. DESCRIPTION OF SYMBOLS 1... Insertion path, 2... Guide path, 2a... Guide groove, 3... Suppression roller, 4... Shaft, 7... Housing, 8... Knurling.

Claims (1)

[Scope of utility model registration request] A guide groove for movably supporting the shaft of the suppression roller is provided along the inner surface of both side walls of the housing, which has an insertion passage through which a flexible liquid feeding tube is inserted, and is arranged along the insertion passage. 1. A clamping mechanism in which a bottom surface of a passage is gradually approached in the direction of movement of the roller, and the circumferential surface of the suppression roller is provided with knurling inclined with respect to its axial direction.