JPH0779911A - Joint of pipes for gas and fluid flow for endoscope - Google Patents

Abstract

PURPOSE:To prevent the narrowing of flow path caused by a leakage of solder or flux at the joint part of the straight and bent pipes, thereby the joint part on the straight run of pipe is provided with roughened surface in such a way that the smearing of solder or flux on the surface being improved in preventing the excessive flow. CONSTITUTION:The rough surface 34 is formed widely around an opening 31 on the straight run of pipe 32 to which an end of a bent pipe 33 is connected. The roughened surface 34 is possible to prevent the excessive flow of solder or flux into an opening 31 thanks to an improvement of the smearing property of soldering material on the uneven surface. It prohibits an overflow of solder into inside when the soldering is carried out outward of joint portion in a manner that the accumulating solder enhances the effective joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air / water feeding mechanism provided for cleaning an observation window of an endoscope, and a connecting pipe for connecting the air / air feeding passage and the water feeding passage to a merging passage. It is about.

[0002]

2. Description of the Related Art As shown in FIG. 1, an endoscope 1 generally comprises an insertion section 3 inserted into a body cavity of a main body operation section 2 and a light guide flexible section 4 connected to a light source device. It is configured to be connected. An observation window 5 is provided at the tip of the insertion portion 3, and an air / water supply nozzle 6 for supplying a cleaning fluid toward the observation window 5 is provided. The air / water supply nozzle 6 is provided with an air / water supply mechanism for supplying a cleaning fluid composed of cleaning water and pressurized air.

The air / water supply mechanism has an air pump 10 and a water supply tank 11. A pressurized air supply pipe 12 is connected to the air pump 10, and a water supply pipe 13 is connected to the water supply tank 11. Here, the water supply tank 11 does not have an independent drive source for water supply, but pressurizes the liquid surface with the pressurized air from the air pump 10, and pressurizes the cleaning water to the water supply pipe 13 by the pressure applied to this liquid surface. Is configured to. For this reason, a tank pressurizing pipe 14 is provided so as to branch from the pressurized air supply pipe 12.

An air supply passage 15 for supplying pressurized air and a water supply passage 16 for supplying washing water are inserted through the light guide flexible portion 4 of the endoscope 1, and the air supply passage 15 is under pressure. The supply pipe 12 and the water supply passage 16 are the water supply pipe 1
3 is detachably connected. The air supply passage 15 and the water supply passage 16 extend to the main body operation unit 2, and the main body operation unit 2 is provided with an air supply / water supply valve 17. Further, an air supply passage 18 and a water supply passage 19 are connected to the air supply / water supply valve 17, and the air supply passage 18 and the water supply passage 19 are extended into the insertion portion 3 and Three
The flow paths 18 and 19 are joined together at a position near the tip of to form a merged flow path 20. The other end of the confluent flow path 20 is connected to the air / water supply nozzle 6.

The air supply / water supply valve 17 is for connecting / disconnecting between the air supply passage 15 and the air supply passage 18 and between the water supply passage 16 and the water supply passage 19 and its valve body. 1
An atmosphere opening passage 17b is formed in the air passage 7a to connect the air supply passage 15 and the air supply passage 18 to the atmosphere. The air / water supply valve 17 can be operated by the fingers of the hand holding the main body operation unit 2. When the air / water supply valve 17 is not touched by the hand, the water supply flow path 16 and the water supply flow path 19 are connected to each other. Is cut off and the air supply passage 15 and the air supply passage 18 communicate with each other,
At the same time, since the atmosphere opening passage 17b is also open, the air from the air pump 10 is opened to the atmosphere, and the pressurized air supply pipe 12 is kept in a state where no pressure is generated, that is, the atmosphere is opened.

The air supply passage 18 and the water supply passage 19 and the merging passage 20 are constructed so as to be joined via a connecting pipe 21. An upstream side of the connecting pipe 21 is provided with a first upstream side connecting part 21a to which the air supply flow path 18 is connected and a second upstream side connecting part 21b to which the water supply flow path 19 is connected. It is a downstream side connecting portion 21c to which the confluent flow path 20 is connected. From the first upstream connecting portion 21a to the downstream connecting portion 21
While it is almost straight up to c, the second
The upstream connecting portion 21b of the is located at a position aligned with the first upstream connecting portion 21a, is bent at a predetermined angle in the middle from this position, and is formed at an intermediate position of the straight pipe portion for merging. It is connected to 22. The connecting pipe 21 configured as described above includes the straight pipe portion 23 extending from the first upstream connecting portion 21a to the downstream connecting portion 21c and the second upstream connecting portion 2
It is configured by connecting and fixing the curved pipe portion 24 extending from 1b to the opening 22.

[0007]

The curved pipe portion 24 constituting the connecting pipe 21 is bent from the middle thereof, and since the bent portion is connected to the straight pipe portion 23,
It is extremely difficult to integrally form the entire connecting pipe 21. Therefore, the curved pipe portion 24 is formed separately from the straight pipe portion 23, and the curved pipe portion 24 is joined so as to surround the portion of the straight pipe portion 23 where the opening 22 is formed, and is brazed or soldered. It is fixed by.

By the way, the curved pipe portion 24 has a straight pipe portion 23.
Since the end face portion to be joined to has a curved shape, it is extremely difficult to strictly process it so as to completely adhere to the straight pipe portion 23 at the time of joining, and therefore, when performing brazing or soldering, , It is not possible to prevent a slight gap from occurring at the joint. When brazing or soldering is performed in such a state where a gap is formed, the braze or solder enters the inside of the gap of the joint portion and, as shown by P in FIG.
Will be solidified in a state where it wraps around the inside of the straight pipe portion 23 from the periphery of the edge portion. As a result, the second upstream connecting portion 21b to the downstream connecting portion 21c
The flow passage cross-sectional area of the opening 22 constituting the flow passage toward the side is narrowed, and the first upstream flow passage 21a is connected to the downstream connection portion 2
The flow path to 1c also has a problem in that the brazing or solder that has entered the straight pipe portion 23 causes a narrowed portion, which impedes the flow of the fluid consisting of cleaning water and pressurized air.

The present invention has been made in view of the above points, and when the straight pipe portion and the curved pipe portion of the connecting pipe are joined / fixed, the air / water supply route of the air / water supply route is increased by the solder or solder that penetrates inside. The purpose is to prevent the flow path from being narrowed.

[0010]

In order to achieve the above-mentioned object, according to the present invention, a straight pipe portion provided in a substantially straight shape and an end portion thereof are substantially parallel to each other and are bent from an intermediate position. , A curved pipe portion connected to the opening formed in the straight pipe portion, and the end surface of the curved pipe portion is joined to the surface of the straight pipe portion so as to surround the portion where the opening is formed, and brazed or soldered. The surface of the straight pipe part from the edge of the opening to at least the curved pipe part is made to be a rough surface that has good wettability with respect to solder or solder. Is its characteristic.

[0011]

When the curved pipe portion is fixed to the straight pipe portion, if the entire end surface portion of the curved pipe portion is in close contact with the straight pipe portion, brazing and solder will not enter inside. Since the end face shape of the curved pipe portion is composed of a complicated curve, it is difficult to obtain strict machining accuracy. On the other hand, except for the problem that the solder or solder enters the inside to narrow the flow path, it does not cause any trouble even if the processing accuracy is not extremely increased.

From the above points, in the present invention, when the curved pipe portion is joined to the straight pipe portion, a slight gap is allowed to occur in the joined portion. When the brazing or the soldering is performed, the fact that the brazing or the solder enters the inside through the gap is not a particular problem. However, the flow path should not be narrowed to reach the opening formed in the straight pipe portion.

Here, from the viewpoint of allowing for some dimensional error and assembling error when joining the curved pipe portion to the straight pipe portion, the opening from the inner diameter of the joined portion of the curved pipe portion to the straight pipe portion is taken into consideration. The diameter of the opening is smaller, but the outer surface of the straight pipe is roughened at least from the edge of the opening to the inside of the part surrounded by the curved pipe to wet the solder and solder. Improve sex. By this, brazing,
When soldering, even if the solder or solder enters the gap, the rough surface suppresses the fluidization and deposits on the site, which quickly closes the gap, and It prevents the solder and solder from flowing into the edge of the opening. As a result, it is possible to reliably prevent the occurrence of a situation in which the flow path is narrowed due to the state of bulging inward from the edge portion of the opening or hanging down in the straight pipe portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, configurations that are the same as or equivalent to those of the above-described conventional technique are assigned the same reference numerals and detailed explanations thereof are omitted.

Thus, as shown in FIG. 3, the air supply channel 1
8 and the connection pipe 30 that joins the water supply passage 19 and the merging passage 20 is connected to the first upstream-side connecting portion 30a to which the air supply passage 18 is connected and the water supply passage 19 on the upstream side. And a second upstream side connecting portion 30b, and the downstream side is a downstream side connecting portion 30c to which the merging flow path 20 is connected. From the first upstream side connecting portion 30a to the downstream side connecting portion 30c. The space is almost straight. Further, the second upstream side connecting portion 30b is located at a position side by side with the first upstream side connecting portion 30a, is bent at a predetermined angle in the middle from this position, and is formed at an intermediate position of the linear pipe portion. Confluence opening 31
It is connected to the. The connecting pipe 30 includes the straight pipe portion 3 extending from the first upstream connecting portion 30a to the downstream connecting portion 30c.
2 and the curved pipe portion 33 extending from the second upstream side connection portion 30b to the opening 31 are joined and fixed by brazing or soldering. Regarding the above points, there is no particular difference from those shown in the prior art.

On the outer surface of the straight pipe portion 32, a rough surface 34 is formed around the opening 31. The rough surface 34 is formed over a wider range from the edge portion of the opening 31 to the position where the curved pipe portion 33 is joined. Thus, by forming the rough surface 34, the straight pipe portion 32
The surface has a good wettability with respect to the solder and the solder, and the solder and the solder can be suppressed from flowing along the surface toward the opening 31 side.

As described above, the opening 3 in the straight pipe portion 32
By forming the rough surface 34 around the periphery of 1, the curved pipe portion 33 is joined to the straight pipe portion 32, and when brazing or soldering is performed from the outside of the joint portion, a slight gap is formed in the joint portion. Even if the solder or solder enters inside through this gap, the rough surface 34 suppresses the fluidization of the solder and solder before reaching the edge portion of the opening 31, as shown in FIG. While stopping at the stage and accumulating, the gap becomes closed, and it is possible to ensure that excessive brazing and solder enter and project from the periphery of the edge portion of the opening 31 or enter the straight pipe portion 32. It can be prevented. As a result, the flow path of the opening 31 forming the flow path from the second upstream side connecting portion 30b to the downstream side connecting portion 30c is narrowed by brazing or solder, or from the first upstream side connecting portion 30b. No restriction is formed on the flow path reaching the downstream side connecting portion 30c,
The cleaning water and the pressurized air in the connection pipe 30 can be surely supplied at the flow rate as designed, and the observation window 5 can be efficiently cleaned.

In the above-described embodiment, the air supply passage 18 is connected to the first upstream connecting portion 30a, and the water supply passage 19 is connected to the second upstream connecting portion 30b. In contrast to this, the water supply passage 10 is connected to the first upstream connecting portion 30a, and the air supply passage 18 is connected to the second upstream connecting portion 30b. You may. Further, the rough surface 34 is formed only on the outer surface of the straight pipe portion 32, but if a similar rough surface is formed on the inner surface of the tip end portion of the curved pipe portion 33, the flow of the brazing filler and the solder that has entered the inside can be prevented. The effect of suppressing deterioration can be further increased.

[0019]

As described above, according to the present invention, the wettability with respect to the solder or the solder is provided by making the portion from the edge portion of the opening in the straight pipe portion to at least the portion surrounded by the curved pipe portion rough. Since it has been processed to make it good,
When joining the curved pipe part to the straight pipe part and fixing it, a slight gap will be created in this joint part, and even if brazing or solder enters inside through the gap when brazing or soldering is performed. , Its fluidization is suppressed, the gap is closed, excess brazing or solder enters, and it extends to the edge part of the opening, narrowing the flow passage cross-sectional area of the opening, and also in the straight pipe part. There is no possibility that a narrowed portion will be formed for the flow path in the straight pipe portion, and the fluid will be circulated at the flow rate as designed so that the observation window cleaning work can be performed smoothly and efficiently. Since it is not necessary to process the end surface of the connecting portion of the curved pipe portion to the straight pipe portion with high precision, it is possible to achieve various effects such as easy manufacturing.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an air / water feeding mechanism of an endoscope.

FIG. 2 is a cross-sectional view showing a configuration of a connecting pipe connecting an air supply channel and a water supply channel to a confluent channel in a conventional technique.

FIG. 3 is a cross-sectional view of a connecting pipe showing an embodiment of the present invention.

FIG. 4 is an external view of a straight pipe portion.

5 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Endoscope 2 Main body operation part 3 Insertion part 5 Observation window 6 Air supply / water supply nozzle 17 Air supply / water supply valve 18 Air supply flow passage 19 Water supply flow passage 20 Confluence flow passage 30 Connection pipe 30a 1st upstream connection portion 30b 2nd Upstream side connection part 30c Downstream side connection part 31 Opening 32 Straight pipe part 33 Curved pipe part 34 Rough surface

Claims (1)

[Claims] 1. An air flow path and a water flow path connected to an air / water supply valve provided in an operation section of a main body of an endoscope are merged in the vicinity of a tip of an insertion section to form a merged flow path. In order to supply the fluid from the fluid to the ejection portion of the fluid, a connection pipe to which the air supply passage and the water supply passage and the merging passage are respectively connected, the straight pipe portion provided in a substantially linear shape, and the end portion It consists of a curved pipe part that is almost parallel to the straight pipe part and is bent from an intermediate position and connected to the opening formed in the straight pipe part. The end face of this curved pipe part has an opening formed on the surface of the straight pipe part. The parts are joined so as to surround them and are fixed by brazing or soldering, and the parts from the edge of the opening in the straight pipe part to at least the curved pipe part are surrounded by the solder or the solder. Air supply and water supply for endoscopes characterized by having a rough surface for good wettability Flow path connection pipe.