JPS6228351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a constant flow regulator comprising a tube through which a fluid passes and a slit member concentrically supported within the tube, the slit member being concentrically supported within the tube. The device is of the type in which the member cooperates with an elastic ring which is pressed onto the slit member by fluid pressure.

This type of constant flow regulator is used, for example, by being installed in a conduit connected to a water heater.
An example of this is known from German Patent No. 2060751. It is recognized that this known example needs improvement in terms of adjustment characteristics. This is because the O-rings used create significant sliding friction with the surface of the slotted insert in the adjusted position. In addition, this known constant flow regulator has an excessively high flow resistance and is therefore also very noisy.

Another constant flow regulator is known which consists of an insert housed within a tubular casing (U.S. Pat.
2781061, German Patent Application No. 1198144). In the case of these known examples, the outer periphery of the inlet end of the insert is contoured, and one piece of hose covers a number of longitudinal passages formed by this contouring. The hose piece itself is held at one end on the outflow end of the insert or is fitted over the entire circumference on the outer periphery of the insert in contact with the profile.

One tubular insert is known from US Pat. No. 2,802,486. This tubular insert has a number of slits in the inner wall of the inlet tube section, into which a pot-shaped insert fits. As a result of the inflow pressure, the internal pressure of the pot-shaped insert increases and the pot-shaped insert is forced into the slit of the outer tubular insert, thereby closing the slit.

What is common to all of these known examples is that
The insert, which is machined in the form of a slot or a longitudinal channel, is of completely uniform design in the flow direction of the fluid whose flow rate is to be regulated.

In practice, such flow regulators produce an unpleasant noise that is unsuitable for general household use. Also,
The adjustment range, which is afforded by the maximum opening of the slot passage and the maximum obstruction by the hose piece, is severely limited. In order to sufficiently close the individual slits, a material of relatively low hardness is required, and such material also does not have sufficient stability.

The object of the invention is to make possible, in a constant flow regulator of the type mentioned at the outset, a constant flow regulation over a large range while avoiding undesirable noise production.

This object was achieved by the present invention as follows.
That is, the slit member is tubular and has a number of vertical groove-like slits on its outer circumference, and each web between these slits extends in the inlet section of the slit member in a direction perpendicular to the flow direction. It has one cavity, and the elastic ring consists of a piece of hose with a length greater than the width of this cavity, which surrounds the area of the web containing the cavity and has a slit. The member extends significantly downstream of the hose piece in the flow direction.

According to the present invention, it is possible to obtain a constant flow rate regulator that has a simple and inexpensive structure, has a wide constant flow rate adjustment range, and has sufficient adjustment accuracy.

In the regulator of the present invention having such a structure, in order to lower the lower limit of the response pressure without increasing the generated noise and to sufficiently eliminate negative hysteresis, the present invention is further characterized by the following points. .
That is, the hose piece rests only at one end in the axial direction on a shoulder in the pipe, to which a shoulder of the slit element abuts flush in the flow direction with an acceptable tolerance; An annular gap is formed between the inner peripheral surface of the hose and the slit,
The slit member is rigidly supported within the tube.

The advantages of such structural treatment are as follows. In other words, the lower limit of the response pressure of the constant flow regulator is made so low that an electric water heater can be installed on the top floor of a high-rise building.

Also, excellent regulation characteristics are obtained even though the flow noise produced by the regulator is kept to a minimum.

The invention will now be explained with reference to the embodiment shown in the drawings: In the embodiment of FIGS. It has section 4. A tubular slit member 5 is concentrically inserted into this tube 1, and this slit member 5 has a large number of vertical groove-shaped slits 6 and webs 7 on its outer circumferential surface, and has a plurality of inlets 9 inside. It is passed through as one concentric bypass section 8 with at the top. The inlet 9 of the bypass section 8 is of oblique radial design when viewed in the flow direction. In front of these inlets 9, an elastic disk 10 is arranged as a closing member. This elastic disk 10 is fixed to a pin projection 12 by a spring ring 11. This pin protrusion 12 is integral with the slit member 5 and protrudes concentrically. The slit member 5 has two ring-shaped protrusions 13 and 14 on the outside of the inlet 9, the protrusion 13 having a slit like the slit 6, and the protrusion 14 not having a slit. Each web 7 has cavities 15 which are surrounded in the circumferential direction of the slit member by a piece of rubber hose 16.
is located. The inner diameter and outer diameter of this hose piece 16 are constant. This slit element 5 with a hose piece 16 is mounted concentrically in the tube 1 via a holding plate 17 having an opening 18, the slit element 5 being lower than the hose piece 16 in the flow direction. It extends far forward. Hose piece 1
6 is supported at its lower end by the shoulder 4 and its upper end by the slitted protrusion 13, so that the slit member 5 is not undesirably displaced in the axial direction by fluid pressure. is prevented. The sum of the opening cross-sectional areas of the bypass section 8 as well as the opening areas of the individual inlets 9 is greater than the sum of the opening cross-sectional areas of the plurality of slits 6.

The elastic disc 10 has a lower elasticity than the hose piece 16, which ensures reliable operation even at low or low fluid pressures.

The mode of operation of the constant flow regulator described above is as follows: the fluid to be regulated is connected to the opening 18 of the retaining plate 17;
It flows into the inlet hole 2 of the pipe 1, into the inlet 9 of the bypass section 8, and flows through the bypass section 8 and into the slit 6. As the fluid pressure increases, the elastic disk 1
0 closes the inlet 9 of the bypass section 8 (approximately 1 bar in the exemplary embodiment), so that fluid flows only through the slit 6. If the fluid pressure increases further, the hose piece 16 will be forced into the recess 15 of the web 7, so that the opening cross-section through which the fluid can flow will be further reduced. As a result, with appropriate dimensioning, the flow rate remains constant even if the fluid pressure increases further. Slit 6, web 7 and its opening 1
5. The noise reduction results from the relatively long continuous flow section consisting only of slits and webs following the constriction point of the hose piece 16. That is, the fluid is divided into a number of mutually partitioned slit-type passages and flows out. The Raynozzle number is the value obtained by dividing the product of the flow velocity and the inner diameter of the passage by the kinematic viscosity coefficient, but in the case of the present invention, the kinematic viscosity coefficient is constant and the total flow cross section is simply Since it is only divided, it is equal to the sum of the individual divided flow cross sections, so the flow path can be kept constant and the inner diameter of the passage becomes small. A smaller internal passage diameter leads to a smaller Raynozzle number and thus to less noise generation.

The adjustment characteristics, in particular the adjustment range, depend on the radius of the arcuate cavity 15 of the web 7.The rated fluid pressure is determined by the depth of the slit 6, the width and number of this slit, which exceeds the depth of this cavity 15. depends on. The adjusted flow rate depends on the cross-sectional area consisting of the diameter of the inlet hole 2 of the pipe 1 and the diameter of the protrusion 14 on the non-slit side, and the larger the cross-sectional area, the larger it becomes. Become. The slit member 5 can be easily manufactured as an injection molded piece.

In the illustrated embodiment, the width of the web 7 is the same as that of the slit 6.
The depth of the slits 6 is alternately greater than the width of the slit 6, and the depth of the shallowest slit is the depth of the slit 1.
The depth is less than 5. The depth of the shallowest slit may be the same as the depth of the cavity 15. The depths of the slits 6 may be the same and greater than the depth of the basin 15. Further, instead of the arc-shaped cavity 15, a corrugated cavity may be used.

3 and 4, inside a pipe 101, which in this case may be an ordinary water pipe or a tubular section of another structure, there is a
A core body 102 and a slit element 104 having a hollow interior 103 and a number of slits 105 are supported. This slit element 104 has a step 106 on its circumferential surface 105', which coincides with a step 107 on the inner circumferential surface 108 of the tube 101.

The inner peripheral surface 108 of the tube 101 has shoulders 109 and 110.
, so that the inner circumferential surface is oriented in the flow direction 1
11 is enlarged in the opposite direction.
The shoulder portions 109 and 110 are annular surfaces formed at right angles, whereas the stepped portion 107 is obliquely conical. The tube 101 has its outer peripheral surface 113
It can be fastened to another structural part via the screw thread 112 provided on it. The inner circumferential surface 108 or the inner circumferential sections 114, 115, 116 are cylindrical.

The slit member 104 consists of a core body 102 , and an inner chamber 103 of the core body 102 is closed from below by a bottom portion 117 . A number of webs 120 protrude from the outer circumferential surface 118 of this core 102 and extend in the flow direction 111 parallel to the center axis of the core. This outer circumferential surface 118 has a cylindrical shape on the fluid inflow side, and a conical shape on the outflow side. In this outflow region the individual webs 120
forms a shoulder portion 121 that is in contact with the shoulder portion 109 in approximately the same line. The tolerances regarding the co-aligned position of the shoulders 109, 121 are designed such that the shoulder 109 is located above the shoulder 121 when viewed against the flow direction 111.

Both shoulders 109, 121, at least one hose piece 12 in the flow direction on shoulder 109
2 is supported. A certain play is provided between the outer peripheral surface 123 of this hose piece 122 and the inner peripheral section 115 of the tube 101. Similarly, a relatively large annular gap 124 is provided between the inner peripheral surface 125 of the hose piece 122 and the web 120 in this area. In this case the individual webs 120
1 in the area covered by the hose piece 122
It has 126 enclosures, and 12 enclosures.
6 is deep enough to leave a slight web residue 127 even at its deepest point.

Inner chamber 103 of slit member 104 and tube 10
one support ring 1 in common to the inner peripheral section 116 of 1
28 is press-fitted, and this support ring 12
8 connects the stepped portion 106 of the slit member 104 to the pipe 101.
It is fixed in position by being crimped onto the inner stepped portion 107.
This support ring 128 has one annular opening 133
This opening 133 has a slit member 1
04 web area, but is separated by a number of radial retaining webs 129. These retaining webs 129 are attached to the hose pieces 122
It is also useful for positioning in the axial direction.

It is also possible to design the slit bottom 130 to different depths or to alternately position slits of different depths.

The mode of operation of the constant flow regulator according to FIGS. 3 and 4 above is as follows: The regulator is shown in the rest position in the left half of the figure. In this rest position, when the electrically heated water heater installed in the system of pipes 101 is activated by opening the hot water tap, the flow direction 11 indicated by the arrow
A flow-through occurs at 1. When the flow rate is low, only a very small pressure difference occurs between the outer circumferential surface and the inner circumferential surface of the hose piece 122, and the deformation of the hose piece 122 is minimal. As the flow rate increases, this pressure difference increases, and the hose piece 122 deforms as shown in the right half of FIG. In this case, the inner circumferential surface 125 of the hose piece 122 enters the cavity 126, and when a constant flow rate state is reached, the inner peripheral surface 125 of the hose piece 122 completely enters the cavity 126.
Fits into 26. Since the end face 131 of this hose piece 122 is pressed against the shoulder 109 in the tube 101, the flow path is only formed by the slit 105, and the parallel flow path is interrupted. On the other side, the inlet pressure of the chamber 132 acts on the outer peripheral surface 123 of the hose piece 122. If the flow rate decreases, the hose piece 12
2 undergoes an elastic return in the direction to its original state. It has been found that in this case the negative hysteresis, which is customary in constant flow regulators of this type, is not only eliminated, but is instead replaced by a positive hysteresis. This means: That is, for a constant inlet pressure, the regulator passes a greater amount of flow when returning from the constant flow position to the original rest position than when moving from the constant flow position to the constant flow position.

According to the embodiment of FIG. 5, for reasons of manufacturing technology, the slit member is not provided only in the inflow side portion where the individual webs transition into their recesses, but is provided as a molded part in the support ring 128 itself. It is provided. That is, the opening 133 is partitioned by a number of holding webs 129 corresponding to the number of webs 120, and these holding webs 129 have the cavity webs 134 as extensions. These cavity webs 134 supplement the original webs 120 of the slit member 104 to form a cavity 126 as a whole. In short, the individual web is divided into two structural parts. The mode of operation of this regulator is similar to that of the embodiment shown in FIGS. 3 and 4, except that the mass production of the slit member with the back-tapered section, i.e. the cavity 126, is simplified.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the constant flow rate regulator according to the present invention, Fig. 2 is a transverse sectional view taken along the - line in Fig. 1, and Fig. 3 shows the second embodiment resting in the left half. Fig. 4 is a cross-sectional view shown by the - line in Figs. 3 and 5, and Fig. 5 is a longitudinal sectional view showing the third embodiment in the working position on the right half. FIG. 4 is a vertical cross-sectional view showing the first half in the rest position and the right half in the working position. 1...Pipe, 2...Inflow hole, 3...Outflow hole, 4...
...Shoulder, 5...Slit member, 6...Slit,
7...Web, 8...Bypass section, 9...Inlet, 10...Disc, 11...Spring ring, 12...
... Pin protrusion, 13, 14 ... Protrusion, 15 ... Hole, 16 ... Hose piece, 101 ... Pipe, 104
...Slit member, 105 ...Slit, 10
6,107...Step part, 108...Inner peripheral surface, 10
9,110...Shoulder, 112...Screw thread, 113
...Outer peripheral surface, 117 ... Bottom, 120 ... Web, 121 ... Shoulder, 122 ... Hose piece, 12
3... Outer peripheral surface, 124... Annular gap, 125...
Inner circumferential surface, 126...Diagram, 128...Support ring, 129...Retaining web, 130...Slit bottom, 134...Diagram web.

Claims (1)

[Claims] 1. A constant flow regulator comprising: a tube through which a fluid passes; a slit member supported concentrically within the tube; and a slit member inserted between the tube and the slit member. The slit member 5 is of the type that cooperates with the ring, which is pressed against the slit member by fluid pressure, and the slit member 5 is tubular and has an elastic ring on its outer periphery. It has a large number of longitudinal groove-shaped slits 6, and each web 7 between these slits 6 has one cavity 15 in the inflow section of the slit member 5 in the direction transverse to the flow direction. Ori,
said elastic ring consists of a hose piece 16 having a length greater than the width b of said cavity 15;
Constant flow regulator, characterized in that it surrounds a web region having a cavity 15 and that the slit element 5 extends significantly downstream of the hose piece 16 in the flow direction. 2. The constant flow regulator according to claim 1, wherein the width of the web 7 is larger than the width of the slit 6. 3. The constant flow rate regulator according to claim 1, wherein the depths of the plurality of slits 6 are alternately different. 4. The constant flow regulator according to claim 1, wherein the plurality of slits 6 have the same depth. 5. The constant flow regulator according to claim 4, wherein the depth of the slit 6 is greater than the depth of the cavity 15. 6. The constant flow regulator according to claim 3, wherein the depth of the shallowest slit is equal to the depth of the cavity 15. 7. The constant flow regulator according to claim 3, wherein the depth of the shallowest slit is smaller than the depth of the cavity 15. 8. The constant flow rate regulator according to claim 7, wherein the cavity 15 has a corrugated shape. 9. The constant flow regulator according to claim 7, wherein the cavity 15 has an arcuate cross section. 10 A constant flow regulator comprising a tube for carrying a fluid, a slit member supported concentrically within the tube, and an elastic ring inserted between the tube and the slit member. It is made up of
The slit member is of the type that cooperates with the ring which is pressed onto the slit member by fluid pressure, and the slit member 104 is tubular and has a number of longitudinal groove-shaped slits 10 on its outer circumference.
5, and each web 120 between these slits 105 has a cavity 126 in the inflow section of the slit member 104 in the direction transverse to the flow direction, and the elastic The ring has a length greater than the width of this cavity1
It consists of two hose sections 122 which surround the web region with the cavity and rest axially at one end only on a shoulder 109 in the pipe 101. The slit member 104 has an allowable tolerance in the machine direction in the section 109.
One shoulder portion 121 of the hose piece 122 is in contact with the hose piece 122 in the same line, and an annular gap 124 is formed between the inner circumferential surface 125 of the hose piece 122 and the slit member 104;
Constant flow regulator, characterized in that the slit member 104 is fixedly supported within the tube 101 and extends significantly downstream of the hose piece 122 in the flow direction. 11 The slit element 104 is fixed in position on the inlet side by a support ring 128 having an opening 133, which part of the support ring 128 defines a part of the cavity web 134 that defines the cavity 126 of the web 120. 12. A constant flow regulator according to claim 11. 12. The constant flow regulator of claim 11, wherein the wall thickness of the hose piece 122 is greater than the width of the shoulder 109 in the tube 101.