JP3778359B2 - Flow resistance setting nozzle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow rate resistance setting nozzle that can be set to a reference flow rate and used for calibration of a flow rate measuring device, etc., and in particular, the flow rate value can be easily set and the set flow rate value can be set over a long period of time. Therefore, it is an object of the present invention to provide a flow resistance setting nozzle capable of maintaining a stable and stable reference flow rate.
[0002]
[Prior art]
Conventionally, the present inventor has proposed various flow resistance setting valves. An example is shown in FIG. FIG. 9 shows a flow resistance setting valve which was proposed as a “micro leak valve” in Patent Document 1 and was assigned to the same person as the assignee of the present application. The flow resistance setting valve includes a metal block 1 having a thin tube through hole 3 through which the thin tube 2 passes and a screw hole 5-1 formed in a direction orthogonal to the thin tube through hole 3, and the thin tube through hole 3 The seal material 4A, 4B for sealing between the outer periphery of the narrow tube 2 and the inner wall of the narrow tube through hole 3, and the screw 5-2 screwed into the screw hole 5-1, 2, the cross-sectional area of the hollow portion of the thin tube 2 can be set to an appropriate value by crushing the appropriate amount of the thin tube 2, and by setting the cross-sectional area, the flow rate of the gas passing through the thin tube 2 is limited. It is a structure to obtain.
[0003]
An example of a practical situation of this flow resistance setting valve will be described with reference to FIG. In FIG. 10, 6 indicates a gas compression source such as a compressor. The gas pressure pressurized by the gas compression source 6 is adjusted by the pressure regulating valve 7, and the adjusted gas pressure is managed by the pressure gauge 8-1 and set to a constant gas pressure (primary pressure). The primary pressure gas is applied to the flow resistance setting valve 9 described with reference to FIG. 9, and the secondary pressure is measured by the pressure gauge 8-1. When the pressure ratio between the secondary pressure and the primary pressure becomes a certain value or less, the flow velocity of the gas flowing through the throttle portion of the flow rate resistance setting valve 9 becomes equal to the sound velocity, and is limited to a constant flow rate and given to the flow meter 10 to be calibrated. If the flow rate measurement value A of the flow meter 10 to be calibrated is calibrated so as to coincide with the flow rate set in the flow resistance setting valve 9, the flow rate measurement value of the flow meter 10 to be calibrated is calibrated.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 5-42283
[Problems to be solved by the invention]
The previously proposed flow resistance setting valve uses a screw 5-2 for flow setting, adjusts the screwing amount of the screw 5-2, crushes the thin tube 2, and restricts the cross-sectional area of the thin tube 2 to a predetermined gas. The flow rate value flowing in a state where pressure is applied is set to a desired value.
As the screwing amount of the screw 5-2 is increased, the flow rate value is reduced. However, if the flow rate value slightly exceeds the target value, the deformation of the narrow tube 2 does not return to the original value, so that the narrow tube 2 Must be replaced with a new one and adjusted again. In this respect, there is a drawback that the setting of the flow value is troublesome.
[0006]
In particular, the screw 5-2 has a structure in which adjustment is performed inside the screw hole 5-1 by using a screw called a set screw or a set screw. The reason is that the screw hole 5-1 can be sealed after setting the flow rate value so that the flow resistance setting state cannot be easily operated. For this reason, a set screw is used as the screw 5-2. However, since the set screw has a driver engagement groove for rotation adjustment at the end of the screw part, the diameter of the screw part is extremely thin. I can't do it. That is, the set screw is generally thick in diameter.
[0007]
Since it is known that the screw pitch becomes coarser as the screw diameter increases, it is difficult to accurately set the flow rate value to the target value by adjusting the screw 5-2 of the set screw structure.
An object of the present invention is to provide a flow resistance setting nozzle capable of easily setting a flow value.
[0008]
[Means for Solving the Problems]
In a first aspect of the present invention, a metal block in which a pipe through-hole is formed; a metal pipe that is inserted into the pipe through-hole and that constitutes a flow path; A prismatic pressure contact tool whose central part is in contact with the first contact part of the peripheral surface of the pipe; and a rough fitting which is attached to the metal block and presses the central part of the pressure contact tool toward the metal pipe with a rough adjustment pressure. An adjustment screw; a first contact which is attached to the metal block so as to be positioned on the same axis as the coarse adjustment screw, has a tip, and this tip is a peripheral surface of the metal pipe and contacts the pressure contact tool A base that is in contact with the second contact portion that faces the portion and holds the metal pipe between the pressure contact tool; and a position that is attached to the metal block and in which the coarse adjustment screw in the center portion of the pressure contact tool is in pressure contact, Pairs separated by approximately equal distance in the longitudinal direction of the pressure fitting In position, two fine adjustment screws that apply pressure in the same direction in parallel to the direction in which the coarse adjustment screw applies the coarse adjustment pressure toward the metal pipe, and the outer peripheral surface of the metal pipe and the metal block A seal member that seals between the inner peripheral surface of the pipe through-hole of the metal, and by a coarse adjustment pressure of the coarse adjustment screw, a metal pipe is sandwiched between the pressure contactor and the base and crushed by a predetermined amount, and fine adjustment A flow resistance setting nozzle is proposed in which a pipe is further crushed by a fine adjustment pressure consisting of a combination of two pressures of a screw.
[0009]
According to a second aspect of the present invention, in the flow resistance setting nozzle according to the first aspect, the metal block has a press fitting insertion hole that communicates perpendicularly to the pipe through hole and penetrates the metal block. Then, a flow resistance setting nozzle is proposed in which the press contact tool is inserted and arranged in the press contact tool insertion hole so as to cross and contact the pipe at a right angle.
According to a third aspect of the present invention, in the flow resistance setting nozzle according to the first or second aspect, the fine adjustment screw has a head portion and a screw portion, and the press contact is located at the symmetrical position, The metal block has two through holes into which the fine adjustment screws are loosely fitted, and the metal block is finely positioned at a position facing the two through holes when the press contact is arranged so as to be in contact with the pipe at right angles. There is a screw hole into which the screw part of the adjustment screw is screwed in. The screw part of the fine adjustment screw is loosely fitted in the through hole of the press contact tool, the head is locked to the press contact tool, and the tip of the screw part is the metal block. The present invention proposes a flow resistance setting nozzle configured to apply pressure to the pressure contact member by the head as it is screwed into the screw hole.
[0010]
According to a fourth aspect of the present invention, there is proposed a flow resistance setting nozzle having a configuration in which the screw portion of the fine adjustment screw has a diameter smaller than the diameter of the screw portion of the coarse adjustment screw in the flow resistance setting nozzle according to the third aspect. To do.
According to a fifth aspect of the present invention, in the flow resistance setting nozzle according to the first or second aspect, the flow resistance having a configuration in which the tip of the base is provided with an arc surface in a direction perpendicular to the cylindrical surface of the pipe. Propose a setting nozzle.
In a sixth aspect of the present invention, in any one of the flow resistance setting nozzles according to the first to fifth aspects, the metal block includes a screw hole for the coarse adjustment screw and a drive hole for the fine adjustment screw. The head of the coarse adjustment screw and the fine adjustment screw has a flow resistance setting nozzle configured to be stored in the screw hole for the coarse adjustment screw and the drive hole for the fine adjustment screw formed in the metal block. suggest.
[0011]
Action According to the flow resistance setting nozzle of the present invention, since the fine adjustment screw is provided in addition to the coarse adjustment screw as the pressure contact force adjusting means, the flow value can be set easily. .
Further, according to the flow resistance setting nozzle according to the present invention, since the shape of the tip of the base is an arc surface in a direction perpendicular to the cylindrical surface of the pipe, the shape of the narrowed portion of the pipe gradually increases in the axial direction of the pipe according to the arc surface. It is narrowed down and has the narrowest part, and after this, it becomes a structure that is gradually expanded. For this reason, the gas flows smoothly through the pipe, and the sonic flow rate value (when the primary pressure value is set to a predetermined value or more and the secondary pressure value is set to a predetermined value or less, In the portion, a phenomenon can be obtained in which the fluid flow velocity reaches the sonic velocity value and maintains a constant flow rate value).
[0012]
As a result, an advantage that a highly reliable reference flow rate value can be reproduced is obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 8 show an embodiment of a flow resistance setting nozzle according to the present invention.
1 and 2 are sectional views of an embodiment of a flow resistance setting nozzle according to the present invention, which are cut in a plane perpendicular to the paper surface including the X and Y axes in FIG. 3 and viewed in the B direction. Here, FIG. 1 shows a state before the rough adjustment operation by the press contact tool, and is also a view cut in a plane perpendicular to the paper surface including the axis Y in FIG. FIG. 2 shows a state after the rough adjustment operation by the press contact tool, and is a view cut in a plane perpendicular to the paper surface including the axis Y in FIG.
[0014]
FIG. 3 shows a plan view of the embodiment shown in FIGS.
4, 5, and 6 are cross-sectional views taken in the direction A and cut in a plane perpendicular to the paper surface including the axes Y and Z in FIG. 3. Here, FIG. 4 is a rough adjustment operation using a rough adjustment screw. FIG. 3 is a cross-sectional view showing the previous state and cut in a plane perpendicular to the paper surface including the axes Y and Z in FIG. FIG. 5 shows a state after the rough adjustment operation using the rough adjustment screw, and is a cross-sectional view taken in the direction of 3B incised in a plane perpendicular to the paper surface including the axes Y and Z in FIG. FIG. 6 shows a state after the coarse adjustment operation using the coarse adjustment screw and after the fine adjustment operation using the fine adjustment screw.
[0015]
7A and 7B are diagrams for explaining the structure of the pressure contact tool used in the present invention, in which A is a plan view and B is a side view.
FIG. 9 is a view for explaining the operation principle of fine adjustment performed by using the pressure contact tool which is a main part of the present invention.
In addition, what attached | subjected the same number or character in each figure represents the same thing.
In the figure, reference numeral 1 denotes a metal block. In this embodiment, the metal block 1 is composed of two blocks 1A and 1B, and these are connected by screws 1C.
[0016]
A pipe through hole 11 is formed in the metal block 1.
Reference numeral 12 denotes a pipe pushed into the pipe through-hole 11, and 4 denotes a sealing material (O-ring) that seals between the outer periphery of the pipe 12 and the inner wall surface 11 BB of the pipe through-hole 11.
The pipe through-hole 11 vertically penetrates the joint surface 1D of these two divided metal blocks 1A and 1B, and the pipe 12 is inserted on the axis X thereof.
The pipe through-hole 11 includes an inlet hole 11A having an inlet 11AA, an outlet hole 11B having an outlet 11BA, an intermediate hole 11C, and a first intermediate connecting the inlet hole 11A and the intermediate hole. It has a hole portion 11D and a second intermediate hole portion 11E connecting the outlet hole portion 11B and the intermediate hole portion 11C.
[0017]
The first and second intermediate hole portions 11 </ b> D and 11 </ b> E are formed so that the inner diameter is narrowed and slightly larger than the outer diameter of the pipe 12.
The inlet hole portion 11A and the outlet hole portion 11B are connected to the first and second intermediate hole portions 11D and 11E, respectively, and between the inclined portions 11AB and 11BB that gradually increase in diameter and the inlet 11AA or the outlet 11BA from the inclined portion. Screw portions 11AC and 11BC are provided.
At each inlet hole portion 11A and outlet hole portion 11B, an attachment 19 in which a sealing material (O-ring) 4 is fitted to the pipe 12 and then outer threads are formed on the outer periphery thereof to be screwed with the inner screw portions 11AC and 11BC. The attachment 19 is screwed into the inlet hole portion 11A and the outlet hole portion 11B, and a sealing material (O-ring) is provided between the outer peripheral surface of the pipe 12 and the inner wall surfaces of the inclined portions 11AB and 11BB of the pipe through-hole 11. ) By sealing 4, the space between the pipe 12 and the inner wall surface of the pipe through-hole 11 is sealed. Accordingly, the pipe 12 is completely sealed from the middle hole portion 11C that is in circulation with the outside air, and all the gas supplied from one inlet 11AA of the pipe through-hole 11 passes through the pipe 12 and is exhausted from the other outlet 11BA. The pipe 12 constitutes a flow path.
[0018]
In the metal block 1, a pressure contact tool insertion hole 13 is formed through the metal block 1 in a direction (Z-axis direction) orthogonal to the pipe through-hole 11 (X-axis direction).
The center X-axis of the pipe through-hole 11 and the center Z-axis of the press-connector insertion hole 13 are separated from each other in the Y-axis direction as shown in FIG. 1, and both holes as shown in FIGS. 1-2 and 4-6. It is formed to communicate with each other at the intersection.
A pressure contact tool 14 is inserted into the pressure contact tool insertion hole 13. As shown in FIGS. 7A and 7B, the pressure contact tool 14 is formed of a prismatic metal block, and through holes 14B and 14C are formed at symmetrical positions equidistant in the opposite direction from the center position 14A in the longitudinal direction.
[0019]
The metal block 1 is further provided with a screw hole 20 into which the coarse adjustment screw 15 is screwed, and two fine adjustment screw drive holes 21 at an equal distance from the screw hole 20, respectively, orthogonal to the press contact tool insertion hole 13. It is formed so as to communicate with the press contact tool insertion hole 13 in the direction (Y-axis direction).
As shown in FIG. 4, the press contact tool 14 is inserted into the press contact tool insertion hole 13 so as to contact the upper surface of the pipe 12 at the first contact portion 12 </ b> A and cross the pipe 12. The axis Y of the screw hole 20 into which the screw hole 20 is screwed is orthogonal to the central portion 14 </ b> A of the press contact 14 and is orthogonal to the axis X of the pipe 12. (See Figure 1)
The distance from the two fine adjustment screw drive holes 21 formed in the metal block 1B to the screw hole 20 with the screw hole 20 interposed therebetween is the center of the press contact tool 14 from the two through holes 14B and 14C formed in the press contact tool 14. It is made equal to the distance to the position 14A.
[0020]
The through holes 14 </ b> B and 14 </ b> C of the press contact tool 14 inserted into the press contact tool insertion hole 13 are disposed at positions facing the fine adjustment screw drive hole 21.
As a result, the center of the tip of the coarse adjustment screw 15 screwed into the screw hole 20 is pressed against the center position 14A of the press contact tool 14.
The metal block 1 is further formed with a screw hole 17 into which the fine adjustment screw is screwed so as to be coaxial with the fine adjustment screw drive hole 21 and the pressure contact tool insertion hole 13 so as to face each other. .
[0021]
The fine adjustment screw 16 includes a head portion 16A and a screw portion 16B, and the inner diameters of the through holes 14B and 14C formed in the pressure contact tool 14 are formed larger than the diameter of the screw portion 16B of the fine adjustment screw 16, The fine adjustment screw 16 is passed through the through holes 14B and 14C of the press contact tool through the fine adjustment screw driving hole 21, and the screw hole 17 formed on the opposite side through the press contact tool insertion hole 13 (FIG. 4-6). The screw portion 16B is screwed into the reference), and the head portion 16A of the fine adjustment screw 16 is engaged with the pressure contact tool 14 so that the pressure contact tool 14 is pressed toward the pipe 12 to achieve fine adjustment.
[0022]
The coarse adjustment screw 15 and the head 16A of the fine adjustment screw 16 are stored in holes 20 and 21 formed in the metal block 1B as shown in FIG. 4-6.
In the metal block 1, a base fixing hole 22 is formed on the opposite side of the pipe 12 so as to face the coarse adjustment screw 15.
A base 18 is disposed in the hole 22. The base 18 has a rising portion 18A and a base portion 18B, and the base portion 18B is located at a position facing the coarse adjustment screw with the pipe 12 sandwiched between the rising portion 18B and the pipe 12 therebetween. 1 is fixed with a screw 18C. The rising portion 18 </ b> A has an arc surface 18 </ b> AA (a surface curved in the axis X direction of the pipe 12: 1 and 2) in a direction perpendicular to the cylindrical surface of the pipe 12 at the tip.
[0023]
In this state, first, the coarse adjustment screw 15 is screwed into the screw 20 and the center portion of the press contact tool is pressed against the pipe. This state is shown in FIGS. This state is a state in which the pressure contact force is not adjusted. That is, at this time, the pipe 12 contacts the press contact tool 14 at the first contact point 12A, and the top ridge portion 18R of the circular arc surface 18AA formed at the tip of the rising portion 18A of the base 18 at the second contact point 12B on the opposite side. In contact.
Further, when the pipe 12 is pressed against the base 18 by the pressure contact tool 14 by screwing the coarse adjustment screw, the pipe 12 is connected to the second contact portion 12A of the base 12 and the arc surface 18AA of the base. The cross-sectional area gradually decreases in the axial direction of the pipe 12, and the cross-sectional area gradually increases after passing through the minimum cross-section portion (distance MS: see FIG. 2). Form an aperture.
[0024]
Here, the screwing amount of the coarse adjustment screw is set to a flow rate value slightly larger than a desired flow rate value to be set by crushing the pipe 12. This state is shown in FIGS. This completes the rough adjustment.
The inner diameters of the through holes 14B and 14C formed in the pressure contact tool 14 are formed larger than the diameter of the screw portion of the fine adjustment screw 16, and during the coarse adjustment, the pressure contact tool 14 is piped only by the coarse adjustment screw 15. 12 is pressed.
2 and 5, the coarse adjustment screw is stopped and the fine adjustment screw 16 is rotated to perform fine adjustment. Since the fine adjustment screw 16 is a screw having a head 16A, the screw diameter of the screw portion 16B can be a diameter of the coarse adjustment screw 15, for example, a diameter smaller than 6 mm, for example, 3 mm.
[0025]
Since the screw with a small screw diameter has a small screw pitch, the deformation amount of the pipe 12 with respect to the rotation amount of the fine adjustment screw 16 can be reduced. Incidentally, when the diameter of the coarse adjustment screw 15 is 6 mm in the fine screw, the screw pitch is 0.75 mm. On the other hand, the screw pitch of a screw having a diameter of 3 mm is 0.35 mm. Accordingly, the amount of movement of the screw with respect to the rotation angle becomes smaller as the screw diameter becomes thinner, and sufficient fine adjustment can be performed.
However, since the fine adjustment screw 16 is arranged at a position equidistant from the center position 14A of the pressure contact tool 14, when the one fine adjustment screw 16 is screwed in, the pressure contact tool 14 is connected to the other fine adjustment screw 16. The pipe 12 is crushed by the lever operation using the position as a pivot point.
[0026]
Therefore, as shown in FIG. 8, for example, the fine adjustment screw 16 inserted into the through hole 14B is set as the fixed fulcrum side, and only the fine adjustment screw 16 inserted into the other through hole 14C is rotated, and the amount of pushing movement is changed. Assuming that M is the amount δ of crushing the pipe 12 by this moving amount M, the distance of the line connecting the centers of the fine adjustment screws 16 (represented by 14B and 14C) is L, and the position of the pipe 12 is approximately Since it is ½, the amount of crushing (aperture amount) δ is also about ½ of M. As a result, since the moving amount M of the fine adjustment screw 16 is further reduced and applied to the pipe 12, the adjustment amount by the fine adjustment screw is finer and easier than the adjustment by the coarse adjustment screw. Can change.
[0027]
In this way, the aperture is narrowed down to a value slightly larger than the desired aperture amount by rough adjustment, and this is the aperture distance MS shown in FIGS. 2 and 5, and then the aperture amount is adjusted by fine adjustment. By adding δ and adjusting it to the final desired aperture amount (distance is MS _F ) (see FIG. 6), it is possible to easily avoid the failure of crushing the pipe more than the desired value. .
In FIG. 8, the pressing tool 14 indicated by a solid line indicates a state before the fine adjustment pressing, and the pressing tool 14 indicated by a dotted line indicates a state after the fine adjustment pressing.
[0028]
When the pipe 12 is pressed against the table 18 by the pressure fitting 14, the pipe 12 gradually decreases in cross-sectional area in the axial direction according to the shape of the table 18, forming a minimum point of the cross-sectional area, and the cross-sectional area gradually increases again. Since the diaphragm of the shape is formed, the speed of sound is obtained when a predetermined condition (when the pressure on the primary side is equal to or higher than the predetermined value and the pressure on the secondary side is equal to or lower than the predetermined value) is satisfied at the position where the cross-sectional area is minimum. A flow rate can be obtained. If the primary pressure exceeds a predetermined value, the sonic flow rate is maintained at a constant value even if the secondary pressure fluctuates somewhat. As a result, if the target flow rate value is set to the sonic flow rate, a highly reliable constant flow value can be obtained.
[0029]
【The invention's effect】
As described above, according to the present invention, since the fine adjustment screw is prepared in addition to the coarse adjustment screw, the flow rate value can be easily set. Furthermore, according to the present invention, the coarse adjustment screw 15 and the fine adjustment screw 16 are stored in the screw hole 20 formed in the metal block 1 and the screw drive hole 21, respectively. After the setting, if the holes containing these screws are closed with a seal or the like, there is no possibility that an accident of changing the set value will occur. Therefore, since the set value can be maintained over a long period of time, a highly reliable reference flow rate value can be provided.
[0030]
In addition, although the stand 18 was made detachable and replaceable with respect to the metal block 1 and the cross-sectional shape in the pipe axial direction of the tip surface 18AA of the stand rising portion 18A was formed on an arc surface, this cross-sectional shape is different from that of the other. By making the shape, it is possible to obtain an effect that the shape of the aperture portion can be arbitrarily set.
[Brief description of the drawings]
1 is a cross-sectional view for explaining an embodiment of the present invention, and is a cross-sectional view seen in a B direction from a cut surface perpendicular to the paper surface including the X and Y axes in FIG. 3;
FIG. 2 is a cross-sectional view similar to FIG. 1 and shows a state after performing fine adjustment work.
FIG. 3 is a plan view for explaining one embodiment of the present invention.
4 is a cross-sectional view as viewed in the A direction from the cut surface including the Y and Z axes in FIG. 3. FIG. 5 is a cross-sectional view similar to FIG. 4 and shows a state after performing rough adjustment work. 6 is a cross-sectional view similar to FIG. 4, and shows a state after performing fine adjustment work. FIG. 7 is a view for explaining the structure of a pressure contact tool used in the present invention, where A is a plan view and B Is a side view.
FIG. 8 is a diagram for explaining the operation of the main part of the present invention.
FIG. 9 is a cross-sectional view for explaining a conventional technique.
FIG. 10 is a block diagram for explaining a practical situation of a conventional flow resistance setting valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal block 4 Sealing material 11 Pipe through-hole 12 Pipe 13 Pressure contact tool through-hole 14 Pressure contact tool 15 Coarse adjustment screw 16 Fine adjustment screw 16A Head 16B Screw part 17 Screw hole 18 Stand 18AA Arc surface 18R Top ridge part

Claims (7)

A metal block in which a pipe through-hole is formed;
A metal pipe for forming a flow path, inserted into the pipe through hole of the metal block;
A prismatic pressure contact tool which is arranged so as to intersect with the pipe at a right angle, and whose central portion contacts the first contact portion of the peripheral surface of the pipe;
A coarse adjustment screw attached to the metal block and press-contacting the central part of the pressure fitting toward the metal pipe with coarse adjustment pressure;
It is attached to the metal block so as to be positioned on the same axis as the coarse adjustment screw, and has a tip portion, which is the peripheral surface of the metal pipe and faces the first contact portion that contacts the pressure contact tool. A stand that contacts the second contact portion and holds the metal pipe between the press contact tool;
The coarse adjustment screw faces the metal pipe at the symmetrical position that is attached to the metal block and is approximately equidistant from the position where the coarse adjustment screw in the center of the pressure fitting is pressed. Two fine adjustment screws that apply pressure in the same direction in parallel with the direction in which the coarse adjustment pressure is applied;
A seal member that seals between an outer peripheral surface of the metal pipe and an inner peripheral surface of a pipe through hole formed in the metal block;
The metal pipe sandwiched between the pressure fitting and the base is crushed by a predetermined amount by the coarse adjustment pressure of the coarse adjustment screw, and the pipe is further pushed by the fine adjustment pressure consisting of two pressures of the fine adjustment screw. A flow resistance setting nozzle characterized by being configured to be crushed. In the flow resistance setting nozzle according to claim 1,
The metal block communicates orthogonally with the pipe through-hole, and has a press contact tool insertion hole penetrating the metal block,
A flow resistance setting nozzle, wherein the pressure contact tool is inserted and disposed in the pressure contact tool insertion hole so as to intersect with the pipe at a right angle. In the flow resistance setting nozzle according to claim 1 or 2,
The fine adjustment screw has a head portion and a screw portion,
The press contact tool has two through holes into which the fine adjustment screw is loosely fitted at the symmetrical position,
The metal block has a screw hole into which the screw portion of the fine adjustment screw is screwed at a position facing the two through holes when the pressure contact member is arranged so as to be in contact with the pipe at right angles.
The screw part of the fine adjustment screw is loosely fitted into the through hole of the press contact tool, the head part is locked to the press contact tool, and the head part is screwed into the screw hole of the metal block. A flow resistance setting nozzle characterized by applying a pressure contact force to the tool. In the flow resistance setting nozzle according to claim 3,
The flow resistance setting nozzle, wherein the screw portion of the fine adjustment screw has a diameter smaller than the diameter of the screw portion of the coarse adjustment screw. In the flow resistance setting nozzle according to claim 1 or 2,
The flow resistance setting nozzle, wherein the tip of the base has an arcuate surface in a direction orthogonal to the cylindrical surface of the pipe. In the flow resistance setting nozzle according to any one of claims 1 to 5,
The metal block has a screw hole for the coarse adjustment screw and a drive hole for the fine adjustment screw,
The flow resistance setting is characterized in that the heads of the coarse adjustment screw and the fine adjustment screw are stored in the screw hole for the coarse adjustment screw and the drive hole for the fine adjustment screw formed in the metal block. nozzle. A metal block having a pipe through hole, a pressure fitting insertion hole, a coarse adjustment screw screw hole, two fine adjustment screw drive holes, two fine adjustment screw screw holes, and a base fixing hole. When;
A metal pipe for forming a flow path inserted into the pipe through hole of the metal block;
A pressure contact tool that is pressed against the metal pipe and crushed to form a desired throttle portion;
A stand for supporting the metal pipe during the pressure contact with the metal pipe by the above-mentioned pressure welding tool;
A coarse adjustment screw for coarsely adjusting the pressure contact force applied to the metal pipe by acting on the pressure contact tool;
Two fine adjustment screws that act on the pressure fitting and finely adjust the pressure force applied to the metal pipe;
A seal member that seals between an outer peripheral surface of the metal pipe and an inner peripheral surface of a pipe through hole formed in the metal block;
A flow resistance setting nozzle comprising:
The pressurizing tool insertion hole is formed to extend in a direction perpendicular to the extending direction of the pipe through-hole, and to be communicated with the pipe through-hole at the crossing portion,
The coarse adjustment screw screw hole is formed so as to be orthogonal to and communicate with each of the holes at the intersection of the pipe through hole and the pressure tool insertion hole,
The two fine adjustment screw drive holes are parallel to the coarse adjustment screw screw hole and sandwich the coarse adjustment screw screw hole from the coarse adjustment screw screw hole in the extending direction of the press contact tool insertion hole. It is formed so as to be orthogonal to and communicate with the two press-fit tool insertion holes at two symmetrical positions separated by an approximately equal distance,
The two screw holes for fine adjustment screws are formed coaxially at positions facing the fine adjustment screw driving holes with the pressure tool insertion hole interposed therebetween,
The base fixing hole is formed at a position facing the screw hole for the coarse adjustment screw across the pipe through hole and the pressure contact tool insertion hole,
The pressure contactor has a prismatic shape and has two fine adjustment screw through holes. When inserted into the pressure contact insertion hole, these fine adjustment screw through holes are arranged at positions facing the fine adjustment screw drive holes. The coarse adjustment screw is screwed into the screw hole for the coarse adjustment screw, presses the pressure contact member with the coarse adjustment pressure at a position crossing at right angles toward the metal pipe, and pushes the metal pipe by a predetermined amount. Crush,
The base has a base and a rising part, the rising part is inserted into the base fixing hole, the tip of the rising part is in contact with the peripheral surface of the metal pipe, and the rough adjustment pressure generated by the rough adjustment screw is used. And fixed so as to receive the pressure contact force applied to the metal pipe from the pressure contact tool,
The two fine adjustment screws have a head portion and a screw portion, and are loosely fitted into the fine adjustment screw through hole of the press contact tool, and the tip of the screw portion penetrates the press contact tool insertion hole, and is formed in the metal block. Are screwed into two screw holes for fine adjustment screws to give two pressures to the pressure contactor at the symmetrical position, and they combine to give further fine adjustment pressure to the pressure contactor to A flow resistance setting nozzle characterized by being configured to be crushed.

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