JP4494812B2 - Check valve housing with flat check valve - Google Patents

Description

The present invention relates to a check valve housing having a tabular check valve, and more particularly the present invention, check valves housing having a blood circuit, flat check valve that is used in medical devices or equipment, such as infusion set It is about.

Conventionally, a check valve is used by interposing between pipe lines in order to prevent a backflow of a liquid flow, and various types are disclosed and medical devices such as various circuits such as blood circuits and infusion sets. Or it is used for equipment. In recent years, such a check valve has been disclosed. Specifically, a duck bill type, an umbrella type, a combination of a ball and a rubber plate, a foot valve, and the like are known. In an example using such a check valve, a duckbill type check valve is the mainstream. This duckbill check valve is performed by puncturing a rubber stopper of the mixed injection port with a mixed injection device connected to the tip of a syringe when a chemical solution is injected into the infusion set or blood transfusion set via a mixed injection tube. Since the sterilization filter and the check valve are built into this mixed injection device, even if the syringe is removed after the injection of the chemical solution, it is possible to prevent liquid leakage and invasion of bacteria (see Patent Document 1).
Japanese Patent Application No. 2003-339876 (paragraph 0002, paragraph 0005, paragraph 0007)

  However, not only the conventional duckbill type but also the umbrella type, the ball and rubber plate combination, and the check valve such as the foot valve may not be able to completely prevent the back flow of the liquid. There is a problem that the variation is likely to occur. In particular, the duckbill type tends to flow backward. Further, among the conventional check valves, check valves such as duckbill type, umbrella type, and foot valve often cannot adjust the pressure, and there is a further problem that the structure is complicated and the processing is complicated. . Accordingly, as a result of various investigations on the above problems, the present inventors have a simple structure, are easy to manufacture, can be mass-produced, and can completely prevent backflow, and from the thickness direction and the outer circumferential direction of the elastic body. It has been found that a check valve that can be adjusted easily and freely simply by pressing can be obtained, and that the above-described effect can be further improved by arranging the check valve in the check valve housing under pressure. The inventors have found that a check valve housing in which a check valve is housed can be obtained, and have made the present invention here.

Therefore, the problem to be solved by the present invention is that the structure is simple and easy to manufacture, mass production is possible, and it is possible to completely prevent backflow, and it is easy only by pressing from the thickness direction and the outer circumferential direction of the elastic body. Another object of the present invention is to provide a check valve housing having a flat check valve in which a check valve capable of freely adjusting pressure is disposed under pressure on the check valve housing .

The above-described problems of the present invention are achieved by the following inventions.
(1) An annular engagement recess is provided on the inner wall of the check valve storage body having the downstream tubular portion, and after the check valve is stored in the check valve storage body, the check valve further having the upstream tubular portion. A check valve having a flat check valve that is fitted with a valve fixing lid, and has an annular protrusion that can be engaged with the annular engagement recess on the outer periphery of the check valve fixing lid. In the housing,
The check valve has a disk shape made of an elastic member having a rebound resilience of 30 to 80%, the downstream side surface is a flat surface having a rectangular slit in the central portion, and the upstream side surface is a flat portion and a rectangular recess. And further having annular airtight projections on the plane of the downstream side and the plane of the upstream side, respectively, and the rectangular slit comprises a through hole, and the through hole communicates with the bottom of the rectangular recess. The rectangular recess comprises a check valve having an inclined portion inclined toward the bottom,
Tip of the check valve fixing lid has a tapered portion having an inclined corresponding to the inclination of the inclined portion of the concave portion of the check valve,
Housing of the check valve, as a check valve in the housing portion of the check valve housing body is oriented plane in which a rectangular slit on the downstream side, and a check valve to under compression for the diameter direction And, after inserting the check valve fixing lid from the upstream side into the storage portion of the check valve storage body , press the inclined portion of the rectangular recess with the tapered portion at the tip of the lid body. The check valve which is made to close and engages and stores the annular protrusion on the outer periphery of the check valve fixing lid is fixed to the annular engagement recess on the inner wall of the check valve storage body. The check valve housing body has a space facing the through hole of the rectangular slit, and a check valve housing.
(2) The check valve housing according to the first aspect, wherein the downstream tubular portion has an engaging portion that can engage the lock ring.

According to the present invention, in the first item, an annular engagement recess is provided on the inner wall of the check valve storage body having the downstream tubular portion, and after the check valve is stored in the check valve storage body, Further, a check valve fixing lid having an upstream tubular portion is fitted, and a flat plate having an annular protrusion that can engage with the annular engagement recess on the outer periphery of the check valve fixing lid In a check valve housing having a check valve,
The check valve has a disk shape made of an elastic member having a rebound resilience of 30 to 80%, the downstream side surface is a flat surface having a rectangular slit in the central portion, and the upstream side surface is a flat portion and a rectangular recess. And further having annular airtight projections on the plane of the downstream side and the plane of the upstream side, respectively, and the rectangular slit comprises a through hole, and the through hole communicates with the bottom of the rectangular recess. The rectangular recess comprises a check valve having an inclined portion inclined toward the bottom,
Tip of the check valve fixing lid has a tapered portion having an inclined corresponding to the inclination of the inclined portion of the concave portion of the check valve,
Housing of the check valve, as a check valve in the housing portion of the check valve housing body is oriented plane in which a rectangular slit on the downstream side, and a check valve to under compression for the diameter direction And, after inserting the check valve fixing lid from the upstream side into the storage portion of the check valve storage body , press the inclined portion of the rectangular recess with the tapered portion at the tip of the lid body. The check valve which is made to close and engages and stores the annular protrusion on the outer periphery of the check valve fixing lid is fixed to the annular engagement recess on the inner wall of the check valve storage body. Since the stop valve housing has a space facing the through hole of the rectangular slit, the inclined portion of the tip of the check valve fixing lid is in surface contact with the inclined portion of the elastic body. Therefore, the rebound resilience resistance is large with respect to the liquid flow from the downstream side, so that the pressing state of the slit is maintained and the liquid is There is no passing it through a. In other words, the inclined portion on the upstream side surface is pressed and fixed by the pressing portion at the tip of the check valve fixing lid, so that a slit is opened by the elasticity of the elastic body in the flow of liquid from the upstream side. Although it passes through the slit without resistance, the inclined portion is pressed and held against the flow from the downstream side, and the slit portion is pressed and held from the surroundings. Cannot pass. In addition, an excellent effect is achieved in that pressure adjustment can be easily and freely performed simply by pressing the thickness and outer periphery of an elastic member having a rebound resilience of 30 to 80% . Further, as described above, the check valve storage body has a space facing the through hole of the stored check valve, so that the through hole of the check valve is deformed when it is elastic in the vicinity thereof, and a liquid flow is generated. Although it passes, there exists an effect that the deformation | transformation space at that time can be hold | maintained. Therefore, the structure of the present invention as described above can function as a complete check valve, that is, completely prevent backflow, and can easily and freely adjust the pressure simply by pressing from the thickness direction and the outer peripheral direction of the elastic body. This is a remarkable effect.

Further storage of the check valve, compressed under the so check valve in the housing portion of the check valve housing body is oriented plane in which a rectangular slit on the downstream side and the check valve with respect to its diameter direction Further, after inserting the check valve fixing lid from the upstream side into the storage portion of the check valve storage body, the inclined portion of the rectangular recess is pressed by the tapered portion at the tip of the lid body. together is brought into close contact Te, to fix the check valve accommodating engages the annular projection having an outer periphery of the check valve fixing lid to the annular engaging recess having an inner wall of the check valve housing body, and further wherein Since the check valve housing has a space facing the through hole of the rectangular slit, it is possible to prevent the backflow more completely and simply press it from the thickness direction and the outer circumferential direction of the elastic body. In addition, there is a particularly remarkable effect that the pressure can be adjusted freely. By having an annular protrusion around the side surface of the check valve fixing lid, not only can the fixing lid be securely fixed at a predetermined position, but also an excellent effect of no leakage can be achieved. is there. Furthermore, in the invention of the second aspect , the downstream tubular portion has an engaging portion that can engage with the lock ring, so that it is possible to prevent a circuit set accident during the treatment from being prevented. Is.

  Hereinafter, the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to the specific examples described below. In the specification, airtight is used to mean that gas or liquid does not leak. FIG. 1 is a plan view and a sectional view showing a check valve of the present invention. In FIG. 1, since the check valve I is housed in an annular housing, the upstream and downstream surfaces of the check valve body 1 made of a circular elastic body are concentric with respect to the center. Airtight annular protrusions 41 and 42 are formed. In addition, a through-hole 3 is provided at the center, and the through-hole 3 is formed with a rectangular slit on the downstream surface, but this shape may be a ship-top shape. Further, the upstream surface has a square, for example, a square 31, and has an inclined portion 2 that is inclined from the surface toward the slit 3 (see a in FIG. 1). The inclined portions 21 and 22 reach the side in the longitudinal direction of the slit. Accordingly, when viewed from the cross-sectional view of FIG. 1b, the inclined portions 21 and 22 form a taper from the upstream side toward the downstream side. Here, the elastic body preferably has a rebound resilience of 30 to 80%. The range of the rebound resilience used is individually determined by the rebound resilience and the degree of compression when the compression arrangement is performed. A preferable material of the elastic body is a synthetic resin, and particularly preferable are silicone, isopropylene, polyurethane, acrylonitrile-butadiene copolymer, fluororesin and the like. Of these, particularly preferred are silicone and isopropylene.

FIG. 2 is a sectional view showing a check valve housing in which the check valve of FIG. 1 is housed in the housing. FIG. 3 is a cross-sectional view showing a check valve housing according to an embodiment of a housing that houses a check valve. FIG. 4 is a cross-sectional view showing a check valve housing having a lock ring. In FIG. 2, the check valve housing II in which the check valve is accommodated has the check valve main body 1 housed under compression in a check valve housing comprising a check valve housing 5 and a fixing lid 6. . That is, the diameter of the check valve main body 1 is slightly larger than the diameter of the check valve housing 5 and is inserted into the check valve housing 5 by being compressed. As a result, the slit 3 is held in close contact as will be described later. It is bent and opened by the pressure of the gas or liquid flowing in from the upstream side, and comes to flow. Specifically, the storage body 1 is arranged and stored so that the square opening 31 side having the inclined portions 21 and 22 is on the upstream side and the rectangular slit 3 side is on the downstream side. The check valve housing 5 has a downstream tubular portion 7 and a space so that a space 13 is formed on the downstream side when the check valve body 1 is housed inside. On the other hand, the fixing lid 6 has an upstream tubular portion 8 on the upstream side of the lid 6, and has a tip 12 on the front side of the lid 6, that is, on the downstream side, The distal end portion 12 has an inclination substantially parallel to the inclined portions 21 and 22 of the check valve body 1, and has a pressing portion 9 that presses the surfaces of the inclined portions 21 and 22. An annular protrusion 11 is provided around the lid body 6 and is fitted into and fixed to an annular engagement recess 10 provided on the inner wall of the check valve housing 5. In the present invention, the check valve 1 housed in such a check valve housing is pressed by the airtight annular protrusions 41 and 42 on the upstream surface and the downstream surface in the housing to maintain airtightness. At the same time, since the diameter of the check valve body 1 is slightly larger than the diameter of the check valve storage body, the slit 3 is held tightly or pressed by being stored in a compressed state. For this reason, when the gas or liquid flow flows from the upstream side to the downstream side, the elasticity of the slit portion of the check valve yields distortion due to the hydraulic pressure, and opens and circulates. On the other hand, when the liquid flow is about to flow from the downstream side to the upstream side, the slit 3 is increased in thickness by the inclined portion and is pressed and fixed by the distal end portion 12 of the lid body 6. Do not bend to the side. Therefore, since the slit 3 cannot open, the liquid flow cannot pass through. As described above, the present invention prevents the backflow compared to the conventional one by combining the simple structure of the check valve 1 and the simple structure of the check valve housing 5 and the fixing lid 6 in the check valve housing. It has a remarkable effect.

  FIG. 3 shows the structure or shape of the check valve housing II, in particular, the circuit connection portion 7 composed of the downstream annular portion and the circuit connection portion 8 composed of the upstream annular portion. The circuit connecting portions 7 and 8 are formed of parallel annular protrusions (bamboo shoots) or spiral thread grooves 14a and 14b. Thereby, the resin pipe (or pipe) of a desired circuit can be reliably connected, and the pipe or pipe does not come off during the process. In FIG. 3 b, in the circuit connection portions 7 and 8, the downstream circuit connection portion 7 has an engagement portion 15, and the upstream circuit connection portion 8 has a flange 81 at the end thereof. By providing these, connection of the connection pipe is facilitated and the connection pipe is prevented from coming off. FIG. 4 shows an example having a lock ring. The lock ring 16 has a thread 71 on the inner wall, and is engaged with a protrusion 15 provided on the circuit connection portion 7 at the end of the inner wall. And fixed. A circuit and other members for chemical solutions are connected to the lock ring 16 thus provided.

It is drawing which shows the non-return valve of this invention, a is the top view, b is sectional drawing in the AB line. It is sectional drawing which shows the non-return valve housing which accommodated the non-return valve of this invention. It is sectional drawing which shows another form a and b of the non-return valve housing of FIG. It is sectional drawing which shows the non-return valve housing which has a lock ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Check valve main body 1a Cover body upstream surface 1b Storage body downstream surface 2 Opening inclined part 21, 22 Inclined part 3 Slit 31 Square (square)
41, 42 Annular projections for airtightness 5 Check valve housing 6 Fixing lid 7 Tubular part (downstream side)
8 Tubular part (upstream side)
DESCRIPTION OF SYMBOLS 9 Press part 10 Annular engagement recessed part 11 Annular protrusion 12 Pipe | tube tip part 13 Space 14a, 14b Bamboo shoot 15 Engagement part 16 Lock ring 71 Thread 81 Flange I Check valve II Check valve housing

Claims (2)

An annular engagement recess is provided in the inner wall of the check valve storage body having the downstream tubular portion, and after the check valve is stored in the check valve storage body, the check valve fixing member further having the upstream tubular portion In the check valve housing having a flat check valve, which is formed by fitting a lid, and has an annular protrusion that can be engaged with the annular engagement recess on the outer periphery of the check valve fixing lid.
The check valve has a disk shape made of an elastic member having a rebound resilience of 30 to 80%, the downstream side surface is a flat surface having a rectangular slit in the central portion, and the upstream side surface is a flat portion and a rectangular recess. And further having annular airtight projections on the plane of the downstream side and the plane of the upstream side, respectively, and the rectangular slit comprises a through hole, and the through hole communicates with the bottom of the rectangular recess. The rectangular recess comprises a check valve having an inclined portion inclined toward the bottom,
Tip of the check valve fixing lid has a tapered portion having an inclined corresponding to the inclination of the inclined portion of the concave portion of the check valve,
Housing of the check valve, as a check valve in the housing portion of the check valve housing body is oriented plane in which a rectangular slit on the downstream side, and a check valve to under compression for the diameter direction And, after inserting the check valve fixing lid from the upstream side into the storage portion of the check valve storage body , press the inclined portion of the rectangular recess with the tapered portion at the tip of the lid body. The check valve which is made to close and engages and stores the annular protrusion on the outer periphery of the check valve fixing lid is fixed to the annular engagement recess on the inner wall of the check valve storage body. The check valve housing body has a space facing the through hole of the rectangular slit, and a check valve housing. The check valve housing according to claim 1, wherein the downstream tubular portion has an engaging portion capable of engaging a lock ring.

Images