voltage limiter

Abstract

The invention relates to an improvement in the field of pressure limiters (1), such as they are used in sanitary water supply systems, in particular. In order to make the pressure limiter (1) reliable also for such water supply systems in which water flows are expected to be contaminated with particles, such as sand, the pressure limiter (1) has a guide surface (8) which has a cross-sectional taper (9) in at least one direction of the movement of the sleeve (4) of the pressure limiter (1).

Description

Technical Field

[0001] This invention relates to a pressure limiter having an internal space connected to the environment, defined by a sleeve movable along a guide device. Such pressure limiters are used, for example, in sanitary water supply systems and are known in practice from various embodiments. The pressure limiter can also be called a pressure relief valve and is used to regulate the pressure in a water supply system to a specific limit value. Here, the operating pressure inside the water supply system is connected to the ambient pressure overcoming a restoring force via the movable sleeve, thereby achieving pressure limiting. The ambient pressure is used here as a reference pressure. The pressure limiting based on the reference ambient pressure is a feature that distinguishes a pressure limiter from a flow regulator. Background Technology

[0002] A problem in practice is that this type of water delivery system can occasionally become contaminated by particles, such as sand. These particles can impair the function of pressure limiters of the type defined at the beginning. Particles contained in the water flow can accumulate in the area of ​​the guide device and affect the mobility of the sleeve. If this occurs, the movement of the movable sleeve (which is necessary for pressure limiting) becomes difficult or even prevented. This can lead to pressure limiter malfunction. Summary of the Invention

[0003] The objective of this invention is to provide a pressure limiter of the type mentioned at the beginning, which can also be reliably used for pressure limiting in water supply systems where there is concern about contamination by particles, such as sand.

[0004] To address this task, a pressure limiter of the type mentioned at the beginning is proposed, particularly for sanitary water supply systems. This pressure limiter has an internal space connected to the environment, defined by a sleeve movable along a guide device. The guide device includes multiple guide protrusions disposed on a base of the pressure limiter spaced apart from the inner wall of the sleeve. These guide protrusions form guide surfaces toward the sleeve, particularly the inner wall, and have a tapered cross-section in at least one or both directions of the sleeve's movement. The tapered cross-section of the guide protrusions can be configured on the inflow and / or outflow sides.

[0005] In this way, particles that may enter the internal space defined by the sleeve can be prevented from accumulating on the guide protrusion. The tapered section can laterally guide particles, such as sand, so that they do not enter the intermediate space between the guide surface and the inner wall of the sleeve.

[0006] In one particularly advantageous embodiment of the pressure limiter, the cross-sectional tapering ends by a radius. Each guide protrusion may have a cross-sectional tapering with such a radius on the inflow and / or outflow side. By using the radius at the end of the cross-sectional tapering, the abutment edges or abutment surfaces that are laterally oriented relative to the direction of movement of the sleeve with respect to the guide protrusion can be minimized or even completely avoided, where particles are particularly likely to accumulate.

[0007] In one embodiment of the pressure limiter, the guide protrusion is specified to have a rhomboid shape in cross-section and / or in top view. Therefore, each of the guide protrusions of the guiding device has two tapering sections in cross-section, which may be formed by half of a rhombus, particularly by a triangle, in cross-section and / or in top view.

[0008] It is particularly advantageous that the tips of the rhomboid shape of the guide protrusion have an angle of less than 90° in the direction of movement, especially on the inflow side and / or outflow side.

[0009] In this way, the tapered section of the cross-section can have an acute angle, which facilitates the aforementioned lateral deflection and / or exclusion of particles that may be contained in the water flow.

[0010] To prevent particles from reaching the inner wall of the sleeve and the guide surface constructed on the guide protrusion, it is advantageous to construct the edge between the guide surface of the guide protrusion facing the sleeve and the lateral defining wall as a sharp edge. The sharp edge at the transition between the corresponding guide surface and the lateral defining wall of the guide protrusion prevents particles that are laterally guided due to the shape of the guide protrusion from still moving onto the guide surface and thus affecting the guidance of the sleeve.

[0011] The sleeve can overcome the restoring force of the reset mechanism, especially the reset spring, to move from the open position to at least the partially closed position. The reset mechanism can be located between the base of the pressure limiter and the sleeve.

[0012] Pressure limiters can be inserted into fluid lines, especially water lines, or connected between them. The internal space of the pressure limiter can be defined by a sleeve, which can also be called a valve body.

[0013] The inner wall of the sleeve can be cylindrical. The guide surface can be coaxial with the inner wall of the sleeve, especially having a protruding arched portion. This facilitates good contact between the inner wall of the sleeve and the guide surface, and thus promotes reliable guidance of the sleeve. Furthermore, by ensuring good contact between the sleeve and the guide surface, particles can be prevented from reaching between the inner wall of the sleeve and the guide surface.

[0014] The pressure limiter may, in particular, have a flow channel within its base, which includes at least one channel opening. This at least one channel opening may be at least partially closed by a sleeve to limit pressure. If the pressure in the piping section downstream of the pressure limiter increases, the sleeve, movable along a guide device, can move from an open position, particularly overcoming the reset force of the previously mentioned reset element, to a closed position under the pressure of the flowing medium. In this closed position, the sleeve may at least partially close the channel opening of the at least one flow channel. As the sleeve is gradually pressed against the base when the pressure in the piping section downstream of the pressure limiter increases, and thus the pressure loss at the consequently decreasing channel opening increases, the pressure in the piping section downstream of the pressure limiter can be limited to a specific maximum value.

[0015] For manufacturing pressure relief devices, it is advantageous to have guide protrusions positioned at an angle on the base, particularly the substrate, away from the mold parting line, so that they are oriented in the demolding direction. This allows the guide protrusions, preferably evenly staggered along the circumferential direction on the outer side of the substrate, to be demolded together. Attached Figure Description

[0016] The present invention will now be described in detail with reference to one embodiment, but the invention is not limited to this embodiment. The accompanying drawings are as follows:

[0017] Figure 1 An isometric view of a pressure limiter is shown, wherein the pressure limiter has a base and a sleeve, a flow channel is constructed in the base, and the sleeve is movably guided along a guide device on the base, the guide device having a plurality of diamond-shaped guide protrusions evenly arranged on the outer circumference of the base.

[0018] Figure 2 Shown in enlarged diagram Figure 1 Details marked with a circle K in the middle;

[0019] Figures 3 to 5 This is a side view of the pressure limiter shown in the foregoing figure, with the pressure limiter in the open position. Figure 3 ), middle position ( Figure 4 ) and a partially closed position, in which the sleeve partially closes the channel opening of the flow channel in the matrix and thus connects with Figure 3 The sleeve position shown reduces the flow rate through the pressure limiter by half.

[0020] Figures 6 to 8 for Figures 3 to 5 A cross-sectional side view of the pressure limiter shown;

[0021] Figures 9 to 11 for Figures 3 to 8 An isometric view of the pressure limiter shown in the image;

[0022] Figure 12 This is a side view of the pressure limiter.

[0023] Figure 13 Show along Figure 12 Cross-sectional view of the pressure limiter on the XIII-XIII line;

[0024] Figure 14 This is a cross-sectional view of the pressure limiter;

[0025] Figure 15 An exploded view of the pressure limiter is shown; and

[0026] Figure 16 This is an isometric view of the pressure relief device base. Detailed Implementation

[0027] All accompanying drawings show at least a portion of the pressure limiter, generally indicated by reference numeral 1. The pressure limiter 1 includes an internal space 2 connected to the environment in its usage position via connections such as openings and / or orifices. The pressure limiter 1 can be flowed through in the direction of arrow Pf1 and can be inserted into or connected to a water pipe, for example, to limit the water pressure in a pipe section downstream of the pressure limiter 1 to a defined maximum value. The pressure limiter 1 may also be referred to as a pressure reducing valve.

[0028] By connecting the internal space 2 to the environment, the pressure limiter 1 can take the ambient pressure as a reference when limiting pressure. The internal space 2 is defined by a sleeve 4 that is movable along a guide device 3. The guide device 3 includes a plurality of guide protrusions 5 disposed on the base 7 of the pressure limiter 1, which is spaced apart from the inner wall 6 of the sleeve 4.

[0029] As shown in the attached figure, guide protrusions 5 are evenly distributed on the outer side of the pressure limiter 1 base 7. The guide protrusions 5 form a guide surface 8 facing the sleeve 4, and the guide surface has a tapered cross-section 9 in both directions of movement of the sleeve 4.

[0030] The tapered section 9 has a radius of 10 on each end side, and the tapered section ends at said radius. For example Figure 2 and 16 As shown, the guide protrusion 5 has a rhomboid shape in cross-section or top view. The tips 11 on the inflow and outflow sides of the rhomboid shape, or rather, the tips 11, have an angle of less than 90° in the direction of movement. Furthermore, Figure 2 As shown, the edge 17 between the guide surface 8 of the guide protrusion 5 and the lateral defining wall 12 of the sleeve 4 is configured as a sharp edge. The sharp edge 17 prevents particles that are laterally guided out due to the shape of the guide protrusion 5 from still reaching the guide surface 8 and thus reaching the space between the guide surface 8 and the inner wall 6 of the sleeve 4, where they affect the guide device 3 of the sleeve 4.

[0031] according to Figures 6 to 8 And the cross-sectional view of 15 shows that the sleeve 4 can move from the open position to at least the partially closed position against the restoring force of the reset mechanism 13 (here, the reset spring). The reset mechanism 13 is here disposed between the base 7 and the sleeve 4.

[0032] Two seals 14 of the pressure limiter 1 are provided on the base 7. The pressure limiter 1 can be inserted into a housing (not shown in the figures). The housing may have at least one corresponding thread to allow the housing, together with the pressure limiter 1, to be inserted into a pipeline and / or intermediately connected between two pipeline sections. The housing may have a connection, particularly a pipeline and / or a hole, through which the internal space 2 of the pressure limiter 1, disposed within the housing, can be connected to the ambient pressure.

[0033] The pressure limiter 1 has a flow passage 15 constructed in its base 7. The flow passage 15 has two channel openings 16, which can be at least partially closed by the sleeve 4 to limit the pressure.

[0034] If the pressure in the pipeline section downstream of pressure limiter 1 increases, the sleeve 4, which can be movably guided along guide device 3, will be subjected to the pressure of the flowing medium from, for example, in... Figure 3 The open position shown in the diagram moves against the reset force of the reset element 13 to, for example, in the position shown in the diagram. Figure 5 In the partially closed position shown, the sleeve 4 at least partially closes the two channel openings 16 of the flow passage 15. Because the sleeve 4 is gradually pressed towards the base 7 against the restoring force of the at least one restoring element 13 as the fluid pressure in the pipeline section downstream of the pressure limiter 1 increases, and thus the pressure loss at the correspondingly reduced channel openings 16 increases, the fluid pressure in the pipeline section downstream of the pressure limiter 1 is limited to a defined maximum value.

[0035] Figure 3 , 6 Figures 4 and 9 show that the sleeve 4 is in its open position relative to the base 7 of the pressure limiter 1. Figure 4 , 7 Figure 10 shows the sleeve 4 of the pressure limiter 1 in an intermediate position, in which the flow rate through the pressure limiter 1 is somewhat restricted. In this intermediate position, the sleeve 4 is resting against the guide surface 8 of the guide protrusion 5.

[0036] Figure 5 , 8 Figure 11 shows the pressure limiter 1 together with the sleeve 4 positioned in a partially closed position. In this partially closed position, the sleeve 4 maximally closes the channel opening 16. This limits the flow through the pressure limiter 1 to a certain extent when the sleeve 4 is positioned relative to the base 7. Figure 3 , 6When the pressure limiter 1 is in the open position as shown in Figure 9, it allows half of the flow rate.

[0037] The inner wall 6 of the sleeve is cylindrical and each guide surface 8 is arched and coaxial with the inner wall 6 of the sleeve. Therefore, the sleeve 4 fits well against the guide surface 8.

[0038] Figure 13 As shown, the guide protrusions 5, positioned away from the mold parting line 18, stand obliquely on the base, i.e., the substrate 7, thus oriented in the demolding direction. This allows the guide protrusions 5, which are uniformly staggered along the circumferential direction on the outer side of the substrate 7, to be demolded together, and simplifies the manufacturing of the pressure limiter 1.

[0039] This invention relates to improvements in the field of pressure limiter 1, particularly its application in sanitary water supply systems. To enable the pressure limiter 1 to be reliably used in such water supply systems (where water flow is expected to be contaminated by particles, such as sand), the pressure limiter 1 has a guide surface 8 having a tapered cross-section 9 in at least one direction of the movement of the sleeve 4 of the pressure limiter 1.

[0040] List of reference numerals

[0041] 1. Pressure limiter

[0042] 2. Interior space

[0043] 3. Guiding device

[0044] 4 sleeves

[0045] 5. Guide protrusions

[0046] 6. Inner wall of the sleeve

[0047] 7. Matrix

[0048] 8 Guide surface

[0049] 9. Tapered section of cross-section

[0050] 10 radius

[0051] 11 tips

[0052] 12 Demarcation Walls

[0053] 13 Reset Mechanism

[0054] 14 seals

[0055] 15 cross-flow channels

[0056] 16-channel opening

[0057] 17 edges

[0058] 18 Mold parting lines

[0059] PF1 flow direction

Claims

1. A pressure limiter (1) having an internal space (2) connected to the environment, the internal space being defined by a sleeve (4) movable along a guide device (3), characterized in that, The guiding device (3) includes a plurality of guiding protrusions (5), which are disposed on the base (7) of the pressure limiter (1) spaced apart from the inner wall (6) of the sleeve. The guide protrusion (5) forms a guide surface (8) facing the sleeve (4). Each of the guide surfaces (8) has a tapered cross section (9) in both directions of the movement of the sleeve (4), and each of the tapered cross section (9) has an acute angle. The sleeve (4) rests against the guide surface (8) of the guide protrusion (5) in the middle position.

2. The pressure limiter (1) according to claim 1, wherein, The pressure limiter (1) is a pressure limiter used in sanitary water supply devices.

3. The pressure limiter (1) according to claim 1 or 2, wherein, The guide surface (8) faces the inner wall (6) of the sleeve.

4. The pressure limiter (1) according to claim 1 or 2, wherein, The guide surface (8) has a tapered section (9) on the inflow side and / or outflow side.

5. The pressure limiter (1) according to claim 1 or 2, wherein, The tapering section (9) of the cross section ends at a radius (10).

6. The pressure limiter (1) according to claim 1 or 2, wherein, The guide protrusion (5) has a diamond shape in cross-section and / or in top view.

7. The pressure limiter (1) according to claim 6, wherein, The tip (11) of the rhombus shape has an angle of less than 90° in the direction of movement.

8. The pressure limiter (1) according to claim 6, wherein, The tip (11) of the rhomboid shape has an angle of less than 90° on the inflow side and / or outflow side.

9. The pressure limiter (1) according to claim 1 or 2, wherein, The edge (17) between the guide surface (8) of the guide protrusion (5) facing the sleeve (4) and the lateral defining wall (12) is constructed as a sharp edge.

10. The pressure limiter (1) according to claim 1 or 2, wherein, The sleeve (4) can overcome the reset force of the reset mechanism (13) and move from the open position to at least the partially closed position.

11. The pressure limiter (1) according to claim 10, wherein, The reset mechanism (13) is a reset spring.

12. The pressure limiter (1) according to claim 10, wherein, The reset mechanism (13) is disposed between the base (7) and the sleeve (4).

13. The pressure limiter (1) according to claim 1 or 2, wherein, The inner wall (6) of the sleeve is cylindrical, and / or the guide surface (8) is coaxial with the inner wall (6) of the sleeve.

14. The pressure limiter (1) according to claim 1 or 2, wherein, The pressure limiter (1) has a flow channel (15) having at least one channel opening (16).

15. The pressure limiter (1) according to claim 14, wherein, The pressure limiter (1) has the flow passage (15) in its base (7).

16. The pressure limiter (1) according to claim 14, wherein, The at least one channel opening (16) can be at least partially closed by the sleeve (4) to limit pressure.

17. The pressure limiter (1) according to claim 1 or 2, characterized in that, The guide protrusions (5) are staggered from each other in the circumferential direction of the base (7), and / or the guide protrusions (5) are inclined on the base and located away from the mold parting line.

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