Main spool for faucet valve

Abstract

The invention relates to a main spool (20) for a faucet valve (10) for dispensing a fluid, having: a channel (13) extending through the main spool (20); a valve seat (21) designed to cooperate with the main valve body (14) of the faucet valve (10) to control the fluid flow through the passage (13); and an external thread (22) for connecting the main valve cartridge (20) to the faucet valve (10), according to the invention, the external thread (22) comprises a plurality of thread projections (23) having an outer side portion (24) and an inner side portion (25), the side angle of the thread projections (23) in the outer side portion (24) being in the range of 25 DEG to 70 DEG, and the side angle of the thread projections (23) in the inner side portion (25) being in the range of 25 DEG to 70 DEG. And the flank angle of the thread protrusion in the inner flank portion (25) is less than 20 DEG, in which the thread pitch of the external thread is greater than twice the width of the thread protrusion (23) measured at the connection between the flank portions (24, 25).

Description

Technical Field

[0001] The subject of the invention is a main valve core of a faucet valve for dispensing fluids. A passage for the fluid extends through the main valve core. The main valve core also includes a valve seat designed to cooperate with the main valve body of the faucet valve to control the flow of the fluid through the passage. The main valve core also includes external threads for connecting the main valve core to the faucet valve. Other subjects of the invention are: a device including a main valve core and a threaded receiver for the main valve core, the threaded receiver being securable inside a faucet valve housing; and a faucet valve including the device. Background Art

[0002] The use of such a main valve core is basically known in the prior art. The main valve core can be screwed into an internal thread located inside the tap valve housing via an external thread and is securely fixed and positioned in this way. The main valve body, which is displaceably mounted inside the tap valve and pre-tensioned against the valve seat to enter a closed position, can usually be actuated by a control rod to control the flow of fluid through the tap valve. For cleaning and maintenance purposes, the threaded connection between the main valve seat and the internal thread can be released to remove the main valve core, thereby enabling simple access to the main valve core or other components inside the tap valve. In the prior art, standard or pointed threads are usually used for threaded connections, such as metric threads with a side angle of 60°. Summary of the invention

[0003] Based on this prior art, the object of the present invention is to provide a main valve core of a faucet valve for dispensing fluids, which main valve core can be positioned inside the faucet valve in an accurate and simple manner. This object is achieved by the features in the independent claim. Advantageous embodiments are described in detail in the dependent claims. According to the present invention, when viewed in cross section, the external thread includes a plurality of thread protrusions, which have an outer side portion and an inner side portion, wherein the side angle of the thread protrusion in the outer side portion is in the range of 25° to 70°, and the side angle of the thread protrusion in the inner side portion is less than 20°. In addition, the thread pitch of the external thread is greater than 2 times the width of the thread protrusion measured at the connection between the side portions.

[0004] First, some terms used in the context of the present invention are explained. In the context of the present disclosure, the term "fluid" can refer to a substance in liquid, gaseous or even mixed phases. The fluid can especially be a fuel.

[0005] The cross section through the external thread under consideration extends through a central axis which is centrally located inside the external thread and extends in the screwing-in direction of the external thread. The thread projection is formed by a thread protrusion which extends in a spiral manner around the central axis on the outer periphery of the thread core. With respect to the central axis of the external thread, the outer flank portion is arranged closer to the outside than the inner flank portion. On the way from the inside to the outside, the flank angle changes at the connection between the flank portions. Therefore, at this connection, the thread flank of the outer flank portion is angled with the thread flank of the inner flank portion.

[0006] The longitudinal direction of the valve seat may coincide with the central axis of the external thread, and the main valve body may move along the longitudinal direction of the valve seat to sealingly close the passage.

[0007] In a preferred embodiment, the external thread is configured as a single thread. Therefore, only a single thread design will be mentioned below. However, in the context of the present invention, a double thread or multiple thread design of the external thread is also possible.

[0008] When viewed in cross section, the thread projection preferably has in each case two thread flanks which extend in a linear manner in the outer flank section and / or in the inner flank section. In this case, the flank angle is constant in the inner flank section or in the outer flank section. At the outer end of the thread projection, the thread projection can be rounded or flattened. This also includes the case where the thread flank has a concave curvature or notch. In this case, the flank angle can be determined between the imaginary outer contour (envelope) of the thread flanks extending in a linear manner.

[0009] The thread pitch refers to the distance between adjacent thread projections of an external thread.

[0010] The shape of the threaded protrusion according to the invention has different flank angles in the region of the outer flank portion and the inner flank portion, and the threaded protrusion has a thread pitch that is greater than the width of the threaded protrusion, which results in a threaded connection that can be realized by means of an external thread having a number of advantageous properties. In particular, it has been shown that the outer flank portions, which are in the form of pointed threads and which are at an angle of 25° to 70° to one another, enable a secure hold to be achieved after the threaded connection has been formed in a highly self-locking manner. At the same time, the threaded flanks that are arranged in the inner flank portion and are more inclined relative to the screw-in direction or may even be positioned perpendicularly to the screw-in direction (flank angle of 0°) can better transmit forces or movements during the screw-in process compared to the threaded flanks located on the outer flank portions, so that the main valve core can be positioned more accurately along the center axis of the external thread.

[0011] In addition, the fact that the thread pitch is greater than the width of the thread protrusion simplifies the positioning of the thread entry point during assembly, so that the external thread can be more easily "threaded into" a suitable internal thread. Specifically, due to the large spacing between the two thread protrusions, the assembler can easily locate the thread start of the external thread by positioning the external thread on the internal thread in the axial direction and then rotating in the direction opposite to the screw-in direction until the thread start of the external thread exceeds the thread entry point of the internal thread. Shortly after exceeding the thread entry point, the external thread may move relative to the internal thread in the direction of the internal thread along a section corresponding to the thread pitch. Due to the large thread pitch of the external thread in the present invention, the assembler can easily perceive this movement. The risk of incorrect assembly and the associated damage or destruction to the start of the thread is thereby greatly reduced.

[0012] The ability to locate the thread entry point in a simple manner can also be used to achieve an accurately fixed threaded engagement and an accurately predetermined axial position of the main valve core by a predetermined rotation. In particular, it can be provided that after locating the thread entry point, the fitter must maintain a predetermined screw-in angle or must rotate the outer thread relative to the inner thread a predetermined number of times to form the threaded connection. The precise adjustment of the axial position is particularly important for the operation of the tap valve, since the forces exerted by the main valve core on adjacent components (such as seals and / or spring elements) depend on this.

[0013] However, in the prior art, a predetermined torque is usually applied during assembly using a torque wrench in order to achieve in this way the desired axial position of the main valve core and the desired thread strength. However, in the context of the present invention, it has been recognized that the predetermination of the torque may lead to an incorrect adjustment of the axial position, since component tolerances and surface conditions may affect the friction between the threaded mating parts. By being able to locate the thread entry point in a simple manner, which achieves a precise thread engagement by specifying the screw-in angle, and by the thread flanks being provided in the inner side portion and oriented approximately perpendicular to the screw-in direction, the axial position of the main valve core according to the present invention and the force exerted by the main valve core on the adjacent elements can be adjusted in a more precise manner.

[0014] In one embodiment, the flank angle of the threaded protrusion in the outer flank portion is in the range of 40° to 70°, preferably in the range of 55° to 65°. Furthermore, the flank angle of the threaded protrusion in the inner flank portion may be less than 10°, and preferably is (approximately) 0°. A flank angle of 0° refers to the case where the flanks extend parallel to each other, i.e. perpendicular to the central axis. Furthermore, the thread pitch may be greater than 1.6 times the width of the threaded protrusion measured at the connection between the flank portions, and preferably the thread pitch is greater than 2.5 times the width of the threaded protrusion measured at the connection between the flank portions. Furthermore, the thread pitch may be less than 6 times the width of the threaded protrusion measured at the connection between the flank portions, and preferably the thread pitch may be less than 3.5 times the width of the threaded protrusion measured at the connection between the flank portions. The positive properties of the threaded connection already described above are even more relevant due to the above-mentioned specific situation.

[0015] The spacing between adjacent thread protrusions (thread pitch) may be 2.5 mm to 3 mm, preferably 2.6 mm to 2.9 mm, more preferably 2.7 mm to 2.8 mm. In addition, the width of the thread protrusion measured at the connection between the side portions may be in the range of 0.5 mm to 1.5 mm, preferably in the range of 0.8 mm to 1.4 mm, more preferably in the range of 0.9 to 1.3 mm. The height of the outer side portion may be 1.2 mm to 1.8 mm, preferably 1.4 mm to 1.6 mm, wherein the height of the inner side portion (25) may be 0.8 mm to 1.4 mm, preferably 1 mm to 1.2 mm. The width of the thread protrusion refers to the extent of the thread protrusion along the central axis of the external thread when viewed in cross section. The height of the corresponding side portion refers to the extent of the side portion in the radial direction (i.e. perpendicular to the central axis of the external thread) when viewed in cross section. The outer diameter of the external thread may be, for example, in the range of 26 mm to 65 mm. In a preferred embodiment, the outer diameter of the external thread is 26 mm to 36 mm, preferably 28 mm to 34 mm, more preferably 30 mm to 32 mm. Alternatively, the preferred range of the outer diameter can also be (in each case inclusive) 37 mm to 47 mm, 39 mm to 45 mm or 41 mm to 43 mm. Alternatively, the preferred range of the outer diameter can also be (in each case inclusive) 49 mm to 59 mm, 51 mm to 57 mm or 53 mm to 55 mm. The preferred range of the core diameter is obtained by deducting the height of the two side parts already mentioned above from the preferred range of the outer diameter.

[0016] In one embodiment, the external thread has a bottom surface between the thread protrusions, the profile of which extends substantially parallel to a cylindrical surface, which is oriented concentrically with the central axis of the external thread. In a cross section, the bottom surface can extend over a local area of ​​the intermediate space between the thread protrusions or over the entire intermediate space. In this case, the central axis forms the center of the cylindrical surface. Specifically, the profile of the bottom surface can adopt a spiral path along the cylindrical surface. The orientation of the external thread in the radial direction can also be improved by the bottom surface. Specifically, when forming a threaded connection, the internal thread can be guided in a radial direction along the bottom surface.

[0017] Another subject of the invention is a device comprising a main valve core according to the invention and a threaded receiver for the main valve core, which can be fixed inside a tap valve housing. The threaded receiver has an internal thread that engages with an external thread, wherein the internal thread has a thread recess into which the thread flanks of the threaded projection located in the outer side portion engage, thereby forming a load-bearing threaded connection. In addition, the internal thread has a guide projection, which is located between the thread recesses and extends over at least a portion of the periphery of the internal thread and bears against the thread flanks of the threaded projection located in the inner side portion in the axial direction. Since the guide projection bears against the thread flanks that are more inclined (or even perpendicular to the central axis) with respect to the center axis, the guide projection plays a guiding role, thereby accurately predetermining the axial position of the main valve seat during the screw-in process. The guide projection can also have a load-bearing role, thereby also contributing to the thread strength. The guide projection can also bear against the bottom surface of the external thread in the radial direction, thereby achieving a radial guide, by which the main valve core can be centered relative to the internal thread.

[0018] The guide protrusion may be located at a thread entry point of the internal thread, which has the advantage that when the threaded connection is formed, the guide protrusion can accurately guide the main valve core to move along the central axis of the external thread.

[0019] The main valve core may have a guide surface, which is located upstream of the external thread in the screw-in direction, and the guide surface is designed so that when the main valve core is introduced into the threaded receiver, the guide surface can be slidably guided by the guide protrusion. Specifically, the guide surface may have a maximum diameter that matches the minimum inner diameter of the internal thread. The guide protrusion may extend over a peripheral portion of at least 90° of the internal thread, preferably, the guide protrusion extends over a peripheral portion of at least 180° of the internal thread, and more preferably, the guide protrusion extends over a peripheral portion of at least 270° of the internal thread.

[0020] Another subject of the invention is a tap valve for dispensing a fluid, comprising a tap valve housing, an inlet, an outlet, a main channel for connecting the inlet fluid to the outlet, a main valve body, a lever for actuating the tap valve, and a device according to the invention. In particular, the device according to the invention can be fixed inside the tap valve housing so that the channel forms part of the main channel of the tap valve. The advantages already described above in relation to the main valve core enable in particular the main valve core to be positioned precisely in the tap valve housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Preferred embodiments of the present invention will be described below by way of example with reference to the accompanying drawings, in which:

[0022] Figure 1 The tap valve according to the present invention is shown in a partial cross-sectional side view;

[0023] Figure 2 The main valve element according to the invention is shown in a three-dimensional view obliquely viewed from above;

[0024] Figure 3 The threaded receiving member and the Figure 2 A main valve core according to the present invention;

[0025] Figure 4 Shows Figure 3 A cross-sectional view of a partial area of ​​an external thread (bottom) and an internal thread (top) of a device in FIG.

[0026] Figure 5 : A side cross-section showing the threaded connection after it has been formed Figure 3 a device according to the invention;

[0027] Figure 6 The enlarged image shows Figure 5 Local details in

[0028] Figure 7 The enlarged image shows Figure 5 Local details in. DETAILED DESCRIPTION

[0029] Figure 1The faucet valve 10 according to the present invention is shown in a partial cross-sectional side view. The faucet valve includes a housing 52, an inlet 50, an outlet 51, and a main channel, which extends through the faucet valve and connects the inlet 50 to the outlet 51. A threaded receiver 30 provided with an internal thread 31 is fixed inside the housing 52. The threaded receiver 30 may be integrally integrated into the housing 52, or may be configured as a separate component. In addition, the faucet valve has a main valve core 20, which has an external thread 22 that can be screwed onto the internal thread 31. The main valve core 20 is positioned inside the housing 52 by a threaded connection between the internal thread 31 and the external thread 22, so that the channel 13 extending through the main valve core 20 forms a part of the main channel.

[0030] The faucet valve also has a main valve body 14, which is Figure 1 In the state shown in FIG. 1 , the main valve body 14 bears against the main valve seat 21 of the main valve core 20. The main valve body 14 is connected to the valve piston 16 and is pretensioned into a closed position against the valve seat 21 by means of a pretensioning element 15. The tap valve can be actuated in a known manner by means of a control rod 17.

[0031] Figure 2 Shows Figure 1 3D view of the main valve core 20 according to the present invention in FIG. The external thread 22 of the main valve core 20 has a thread protrusion that extends around the outer periphery of the main valve core 20 in a spiral manner and concentrically with the central axis of the external thread 22. When viewed in cross section (see Figure 4 In the bottom part of the figure, a plurality of thread protrusions 23 protruding from the thread projection can be seen. Between the thread protrusions 23 is located a bottom surface 28 which is oriented substantially parallel to the central axis and also extends in a spiral manner around the central axis.

[0032] Figure 3 The threaded receiver 30 and the threaded connector 30 are shown in a partial cross-sectional side view before the threaded connection is formed. Figure 2 The main valve core 20 according to the present invention is shown in the figure. In this view, it can be seen that the internal thread 31 has a thread recess 33, into which the thread protrusion 23 of the main valve core 20 engages during the formation of the threaded connection. In addition, the internal thread 31 has a guide protrusion 38, which extends over a circumferential angle of 360° in the area of ​​the thread entry point 37. The guide protrusion 38 is designed to cooperate with the guide surfaces 43 when the main valve core 20 is introduced. These guide surfaces are arranged at the front end of the main valve core 20 upstream of the external thread 22 in the screw-in direction. Through the cooperation of the guide surfaces 43 and the guide protrusions 38, the main valve core 20 is centrally positioned relative to the threaded receiver 30. This will be described hereinafter. Figures 4 to 7 The design of the external thread 22 and the internal thread 31 will be described in more detail.

[0033] Figure 4 Shows Figure 3 A cross-sectional view of two partial regions in which the thread core 20 ( Figure 4 The outer thread and the thread receiving member 30 ( Figure 4 The cross section is oriented along the central axis of the corresponding thread. In this view, it can be seen that the threaded protrusion 23 has an outer side portion 24 and an inner side portion 25. The connection between the side portions 24, 25 is Figure 4 4. In the outer side part 24, the thread projection 23 is formed in each case by two thread flanks 26, which are oriented at a flank angle of 60° to one another. In the inner side part 25, the thread projection 23 has two thread flanks 27, which are oriented parallel to one another (i.e. positioned at an angle of 0° to one another). The thread flanks 27 are therefore oriented perpendicular to the center axis of the external thread 22. The bottom surface 28 already mentioned above is located between the two thread projections 23.

[0034] exist Figure 4 In the upper part of the drawing, it can be seen that the internal thread 31 also has an inner side surface portion 35 and an outer side surface portion 34. The connection between the side surface portions 34, 35 is also indicated here by a dashed line 44. The thread recess 33 is located in the outer side surface portion 34. The thread recess 33 is designed so that when the main valve core is screwed in, the thread flank 26 of the external thread 22 engages in the thread recess 33, thereby forming a load-bearing threaded connection. Due to the thread pitch and the flank angle of the thread projection 23, a higher thread strength can be achieved in this way, and effective self-locking is achieved.

[0035] The guide protrusion 38 mentioned above is located at Figure 4 31 and the central thread recess 33. The guide protrusion 38 extends beyond the connection line 44 in the radial direction, and the guide protrusion has a radial guide edge 39 and an axial guide edge 40. When the threaded connection is formed, the axial guide edge 40 bears against the corresponding thread side 27 in the inner side portion 25 of the external thread 22. Therefore, the rotation of the main valve core is converted into axial displacement in an efficient and accurately positioned manner. In addition, by the cooperation of the radial guide edge 39 and the bottom surface 28, the main valve core 20 can be accurately centered relative to the internal thread 31.

[0036] As mentioned above, the guide projection 38 extends only over a portion of the periphery of the internal thread 31. Figure 4In the embodiment, there is no guide protrusion 38 between the central thread recess 33 and the right thread recess 33, but there is a flat thread protrusion 45, which does not extend beyond the connecting line 44 in the radial direction. In the context of the present invention, it has been shown that the guide protrusion 38 extending only on a partial portion of the periphery is sufficient for radial positioning and axial positioning. However, in other embodiments, the guide protrusion 38 can also extend on a larger circumferential angle or extend on the entire internal thread.

[0037] Figure 5 The side cross-sectional view shows the threaded connection between the external thread 22 and the internal thread 31. Figure 3 The device according to the invention. Figure 6 The enlarged view shows Figure 5 Partial details marked with letter A. Figure 7 The enlarged view shows Figure 5 Detail identified with letter B in FIG. From these figures it can be seen that the guide projection 38 arranged on the thread entry point 39 of the internal thread 22 is located between the two thread protrusions 23, wherein the radial guide edge 39 bears against the bottom surface 28 and the axial guide edge 40 bears against the thread flank 27 in the inner flank portion 25. In this view, the center axis 19 of the external thread 22 and the internal thread 31 is also shown.

[0038] exist Figure 5 In FIG. 1 , the side angle of the threaded protrusion 23 is shown to be 60°. Figure 5 and Figure 7 The following thread parameters are shown by lines and arrows arranged on these figures:

[0039] 60: Width of thread recess 33 (in the region of connecting line 44) = 1.2 mm;

[0040] 61: thread pitch = 2.75 mm;

[0041] 62: The internal thread is in the area of ​​the flat thread protrusion 45 (with Figure 4 The inner diameter in corresponds to the spacing between the two connecting lines 42 or 44 shown in FIG. 1 ) = 29.4 mm;

[0042] 63: outer diameter of external thread 22 = 30.9 mm;

[0043] 64: Maximum inner diameter of internal thread 31 = 31 mm;

[0044] 65: inner diameter of the internal thread in the region of the guide projection 38 = 28.5 mm;

[0045] 66: outer diameter of the external thread in the region of the bottom surface 28 = 28.3 mm;

[0046] 67: Width of threaded protrusion 23 = 1 mm;

[0047] 68: Width of guide surface 28 = 1.75 mm;

[0048] 69: Width of guide protrusion 38 = 1.525 mm.

Claims

1. A main valve core (20) of a tap valve (10) for dispensing fluid, the main valve core having: a passage (13) extending through the main valve core (20); a valve seat (21) designed to cooperate with a main valve body (14) of the tap valve (10) to control the flow of fluid through the passage (13); and an external thread (22) for connecting the main valve core (20) to the tap valve (10), characterized in that: When viewed in cross section, the external thread (22) comprises a plurality of thread protrusions (23), the thread protrusions having an outer side surface portion (24) and an inner side surface portion (25), wherein a side surface angle of the thread protrusion (23) in the outer side surface portion (24) is in the range of 25° to 70°, and a side surface angle of the thread protrusion in the inner side surface portion (25) is less than 20°, wherein a thread pitch of the external thread is greater than 2 times a width of the thread protrusion (23) measured at a connection portion (42) between the side surface portions (24, 25).

2. The main valve core (20) according to claim 1, wherein: The flank angle of the threaded protrusion (23) in the outer flank portion (24) is in the range of 40° to 70°, preferably in the range of 55° to 65°.

3. The main valve core (20) according to claim 1 or 2, wherein: The flank angle of the threaded protrusion (23) in the inner flank portion (25) is less than 10°, and preferably 0°.

4. The main valve core (20) according to one of claims 1 to 3, wherein: The thread pitch is greater than 1.6 times the width of the thread protrusion (23) measured at the connection (42) between the side portions (24, 25), and / or the thread pitch is less than 6 times the width of the thread protrusion measured at the connection between the side portions.

5. The main valve core (20) according to one of claims 1 to 4, wherein: The thread pitch is 2.5 mm to 3 mm, preferably 2.6 mm to 2.9 mm, more preferably 2.7 mm to 2.8 mm.

6. The main valve core (20) according to one of claims 1 to 5, wherein: The width of the threaded protrusion (23) measured at the connection (42) between the side portions (24, 25) is in the range of 0.5 mm to 1.5 mm, preferably in the range of 0.8 mm to 1.4 mm, more preferably in the range of 0.9 mm to 1.3 mm.

7. The main valve core (20) according to one of claims 1 to 6, wherein: The external thread (22) has a bottom surface (28) between the thread protrusions (23), the contour of the bottom surface being oriented substantially parallel to a cylindrical surface oriented concentrically with a central axis (19) of the external thread (22).

8. The main valve core (20) according to one of claims 1 to 7, wherein: The height of the outer side portion (24) is 1.2 mm to 1.8 mm, preferably 1.4 mm to 1.6 mm, wherein the height of the inner side portion (25) is 0.8 mm to 1.4 mm, preferably 1 mm to 1.2 mm.

9. The main valve core (20) according to one of claims 1 to 8, wherein: The outer diameter of the external thread (22) is 26 mm to 36 mm, preferably 28 mm to 34 mm, more preferably 30 mm to 32 mm, or wherein: The outer diameter of the external thread (22) is 37 mm to 47 mm, or the outer diameter of the external thread is 49 mm to 59 mm.

10. A device comprising a main valve cartridge (20) according to one of claims 1 to 9 and comprising a threaded receiver (30) for the main valve cartridge (20), the threaded receiver being fixable inside a tap valve housing (52), wherein: The threaded receiver (30) has an internal thread (31) engaged with the external thread (22), wherein the internal thread (31) has a thread recess (33), and the thread side surface (26) of the threaded protrusion (23) located in the outer side surface portion (24) engages in the thread recess, thereby forming a load-bearing threaded connection, wherein the internal thread has a guide protrusion (38), which is located between the thread recesses (33) and extends over at least a part of the periphery of the internal thread and bears against the thread side surface (27) of the threaded protrusion (23) located in the inner side surface portion (24) in the axial direction.

11. The device according to claim (10), wherein: The guide protrusion (38) is located at a thread entry point of the internal thread (31).

12. The device according to claim 10 or 11, wherein: The main valve core (20) has a guiding surface (43), which is located upstream of the external thread along the screw-in direction, and the guiding surface is designed so that when the main valve core (20) is introduced into the threaded receiver (30), the guiding surface is slidably guided by the guiding protrusion (38), wherein the guiding protrusion preferably extends over a peripheral portion of at least 90° of the internal thread (31), more preferably, the guiding protrusion extends over a peripheral portion of at least 180° of the internal thread, and more preferably, the guiding protrusion extends over a peripheral portion of at least 270° of the internal thread.

13. The device according to one of claims 10 to 12, wherein: The external thread (22) has a bottom surface (28) located between the thread protrusions (23), wherein the guide projection (38) bears against the bottom surface (28) in the radial direction.

14. A tap valve (10) for dispensing a fluid, comprising a tap valve housing (52), an inlet (50), an outlet (51), a main channel for fluidically connecting the inlet (50) to the outlet (51), a main valve body (14), a control lever (17) for actuating the tap valve (10) and a device according to one of claims 10 to 13.

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