DE2038978A1 - throttle - Google Patents

Description

The invention relates to throttle valves. In particular, the invention relates to throttle valves with within one Housing located flow passage and bit a disc body, which is rotatably displaceable within the flow passage between the open and closed position. The disc body has a Control or cam body, which on parts of the Throttle housing can be applied when the disc is rotated into the closed position. The control body pushes while the disk in sealing contact with a seat located on the housing.

209808/0818

Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann

OppenauerBüroi PATENT ADVOCATE DR. REINHOLD SCHMIDT

Throttle valves are widely known and used in the industry. Throttle bodies are suitable and popular for a number of reasons; they are relatively cheap compared to valves or flaps Construction, they are easier to install and easier to maintain. In addition, they have proportionately linear flow characteristics when the flap is moved from the open to the closed position and vice versa.

A problem which has essentially limited the field of application of throttle valves is that they are limited to low pressure systems. Commercially available throttle valves are based on the puncture a rotatable disc body within a seat body located in a housing. The extent of the between Disc body and seat body sealing force exerted when the disc is in the closed position hang; from the accuracy of the production and therefore on the production tolerances.

With the present invention, a throttle valve has been created which has a device to the Apply the flap or the disc in engagement to the seat when it is moved into the closed position.

In view of the problems mentioned, the object of the present invention is to provide an improved throttle valve. In particular, a throttle valve provided with a device is to be created in order to effectively pressing the flap or disc in sealing contact against a seat when the disc body is rotated into the closed position.

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The throttle valve should have a control system in order to be able to effectively press the disc against its seat when it is turned in the closed position.

The throttle valve according to the invention has a housing or a body bit axially extending therein flow passage. A disk is rotatably supported within the flow passage; the body or the housing of the The throttle valve is provided with a seat on which the disc can be moved into sealing contact when it ' is rotated to its closed position. The contact of the disc on the seat is brought about with the help of a control.

The throttle valve has an elastic seat as well as an arrangement in order to prevent this elastic seat body from being trapped by the enclosed medium Gas pressure is shifted.

According to the invention, the bottom closing force of the disk body be adjustable at its seat to manufacturing tolerances or to compensate for wear and tear.

Embodiments of the present invention are explained with reference to the accompanying drawings.

Figure 1 of the drawings is a sectional view of a Throttle valve according to the present invention;

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1 showing the control device through which the effective sealing pressure of the The disc body can be achieved on the throttle valve seat when the disc body is in the closed position;

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FIG. 3 is a sectional view taken on line 3-3 in FIG. 1

Fig. 4 is a partial view of the throttle valve of the present invention showing a further execution of the seat;

FIG. 5 is a partial view of the throttle valve according to FIG present invention showing a further embodiment of the seat;

Fig. 6 is a partial view of the throttle valve of the present invention showing one improved elastic seat according to Figure 1 of the drawings;

Fig. 6A is a partial view corresponding to Fig. 6 of the drawings showing the relationship of the components; when the disc body has moved slightly from the closed position to the open position;

FIG. 7 is a top view on line 7-7 according to FIG. 1 of the throttle valve according to the invention;

Fig. 8 is a partial view of another embodiment of the seat of the present invention; in particular one is the pressure behind the elastic Body of seat override device shown;

FIG. 9 is a plan view of an elastic body used in the seat shown in FIG. 8 finds; and

FIG. 10 is a sectional view of the resilient seat of FIG Line 10-10 in Figure 9.

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In Fig. 1 of the drawings, an embodiment of the invention is shown by way of example a body 12 which has the shape of a flat disc and which is between the flanges of a pipeline or the like can be inserted. Within the body 12 there is an axially extending flow passage 14 and a shaft opening 16 of smaller diameter. The shaft opening 16 intersects the flow passage 14 perpendicular to its axis. Further is the body 12 equipped with a seat 18 reduced in diameter. In the illustrated embodiments of the present invention, the seat 18 is composed of removable members, although of course it is made in one piece as a Part of the body can be manufactured. The removable or replaceable elements that make up the seat 18, are explained in detail in the course of the description.

Inside the flow passage 14 is a disk 20 rotatably mounted. The disk has a seat surface 22 on part of its circumference. The disc 20 can be rotated between closed and open position In the closed position, the seat surface 22 rests on the seat 18 of the body, while in the open position the plane the seat surface 22 runs parallel to the axis of the flow passage 14. In the open position the medium is free flow through the flow passage 1% on both sides of the disc.

The disk 20 is held rotatably within the flow passage 1% with the aid of an adhesive body 24. Of the The stem body consists of two parts, i.e. an upper stem part 24A and a lower stem part 24B. Although the shaft could be made uniform, it will

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the embodiment shown is preferably used, as a one-piece, through the flow passage 14 extending shaft Ib essential the flow of flow would affect. The shaft parts 24A and 24B are arranged coaxially to one another and are rotatably mounted in shaft openings 16 of the valve body by means of seals. A non-metallic sliding bearing bushing 26 surrounds the shaft parts 24A and 24B and reduces the torque required to turn the shaft. Bushings of the type described, however, are not essential to the present invention. The shaft parts 24A and 24B can be rotatably disposed directly within the shaft openings 16 in the same way.

Sealing bodies in the form of O-rings are on both Shaft parts 24A and 24B and in which the shaft openings 16 surrounding body provided and prevent the leakage of the medium from the flow passage 14 to the outside the throttle. Body 28 placed on the cans, each provided with an opening 30, keep the sleeves 26 in the throttle valve and serve at the same time to the Align the shaft part 24A with respect to the shaft part 24B in alignment.

The shaft portion 24A extends from the body 12 of FIG Flap outwards and at this end can be opened with a Handle or the like can be fitted to rotate the disc 20.

The disk 20 consists of a substantially flat, circular body 32 with a seat surface 22 running around the circumference. Shaft extensions 34 made in one piece extend perpendicularly from the flat body 32 in FIG

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Seat 22 in the opposite direction. The shaft extensions 34 are arranged parallel and diametrically spaced from one another on the flat disk. The shaft extensions 34 have openings 36 which are aligned with one another to accommodate the shaft parts.

The diameter of the openings 36 in the shaft extensions 34 is preferably somewhat larger than the diameter of the shaft parts 24A and 24B. Thereby there is a limited μ

allows lateral movement of the disc 20 when this is brought into their sitting position. In order to rotatably connect the disc 20 to the shaft parts 24A and 24B, A post 38 extends through the post opening 40 in each of the stem extensions 34. The stem portions 24A and 24A 24B are equipped in the same way with a pin opening 42, in each of which a pin 38 is received · To allow the lateral movement of the disc relative To enable the shaft parts 24A and 24B, the pin opening 42 in each shaft body is slightly larger than the outside diameter of the pin, while the pin 38 fits exactly into the pin openings 40 of the disc are to shift or loosen the pins to J

impede. It is obvious that an opposing arrangement would suffice or function equally, i.e. the pegs 38 can exactly fit into the Pin opening 42 of the shaft parts 24A and 24B are fitted, while the pin openings 40 of the washer slightly can have a larger diameter. Other configurations can also be used to rotate the To fix disk 20 to at least one of the shaft portions 24A or 24B while maintaining limited lateral movement of the disk.

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An essential feature of the present invention consists in a device by which the disc 20 is pressed against the seat 1Θ of the throttle housing or throttle body with a seal when the disc 20 is rotated to its closed position. This is done with the help of a one-piece control cam 44, which is illustrated in Figure 2 of the drawings. The control cam 44 is on the rear side of both Shaft extensions 34 are arranged opposite the seat surface 22 running on the circumference. The control cams 44 are arranged diametrically to each other, while each of the cams in a plane perpendicular to the axis of the shaft parts 24A and 24B is aligned. Each of the control cams 44 is in a plane running perpendicular to the shaft parts formed and consists of a curved outer surface of increasing radius compared to the Axis of the shaft parts.

Lugs 46 of the body or housing 12 extend in part into the flow passage 14. At these lugs 46 put the control cams 44 on when the disc is rotated into the closed position.

In Fig. 2 of the drawings, the relationship of the control cams 44 of the disc in contact with the shoulder 46 of the valve body is shown when the disc is in the closed position. It can be seen that the disc 20 is pressed forward onto the seat 18 when the control cam 44 is pressed against the projection 46. on this way an effective seal of the disc on its seat is achieved by turning the throttle valve is to be opened, the force exerted by the control cam 44 is less when the disc is a few degrees

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was filmed. The pressure of the window on the seat is thereby applied solved. With this arrangement, an effective sealing of the disk at its seat can be achieved when the disk is is in the closed position. However, the wear on the disc on its seat is significantly reduced, when the disc is rotated between open and closed positions.

An essential feature in order to achieve an effective sealing pressure is that the washer 20 can rotate freely with respect to the shaft parts 24A and 24B within certain deflections. Since the pressure of the disk 20 on the seat 18 of the throttle valve is generated by the control cam or cams kk and not by lateral forces exerted by means of the shaft bodies 24A and 24B, the disk does not exert any lateral force on the shaft parts in the closed position. In the case of shaft bodies with a different configuration, the entire force used to seal the disk on the seat is transmitted directly to the shaft body, which in most cases deforms them. In throttle valves of known embodiment, the force pressing the stem in the direction of one side of the stem opening causes an increase in leakage along the valve stem in most cases. According to the invention, the shaft parts are not under lateral force when the disk is in the closed position. The possibility that the shaft parts will warp and that leakage will occur along the shaft body is significantly reduced as a result.

Another essential feature of the present invention is the improved seat bodies. The in Fig. 1 of the drawings seat shown is in something

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enlarged representation In Fig. 6 and 6a of the drawings reproduced »In this seat arrangement, the housing or where the body 12 of the throttle valve is old with Internally threaded part 48 fitted, which may have enlarged diameter. A removable seat ring 50 ”with external thread is in the threaded part 48 and has an annular seat surface 52. In that illustrated in Figure 5 of the drawings The seat surface 52A of the seat ring is of concave cross-section, while the seat surface 22 of the Disc 20 has a corresponding convex cross section. In this way the seat is engaged between the washer 20 and seat 52A extended when the disc is in the closed position. In addition, is a allows a softer or smoother transition of the movement of the disc from the open to the closed position and vice versa.

To prevent the seat ring 50B from being loosened or unscrewed from its position within the body 12 is at least one narrow threaded opening 54 in the Seat ring (Fig. 5) is provided. This opening intersects the seat ring on its circumferential threaded side. A set screw 56 in threaded opening 54 engages the threads of the threaded body 48 and changes so that the seat ring 50B loosens. In order to prevent leakage between the seat ring 50B and the housing or body 12 of the throttle valve, a sealing body 58 is provided.

The feature of the threaded seat ring 50B is essential. As already mentioned, In most throttle valves, the sealing engagement between the body and the disc depends on precise machining tolerances

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Ii

zen ab, According to the invention, any inaccuracy in the machining of the individual components of the throttle valve is compensated for by adjusting the thread of the seat ring 5OB located in the housing. If wear occurs on the parts of the throttle valve, so on the seat surfaces 22 and 52A or on the control cam kk, which would normally reduce the closing force between the disc and seat, this wear can be compensated when the seat ring inwards in the direction of the Washer is screwed.

The arrangement shown in Fig. 5 of the drawings creates a fit between metal and metal. In Fig. K of the drawings, a further developed embodiment of the present invention is shown. In this embodiment, a metal-to-metal seal is combined with the advantages of an elastic seal. According to the embodiment shown in FIG. K , an annular groove 60 is arranged on the seat surface 22 of the disk 20 located on the circumference. The annular groove 60 is preferably dovetail-shaped, ie it is wider at its base, while it is narrower opposite the seat surface 22 ”. Inside the annular groove 60 is an elastic sealing body 62 which normally, ie when the disk 20 is not in the closed position, protrudes somewhat beyond the seat surface 22. The elastic sealing body 62 can consist of various materials depending on the intended use of the throttle valve, for example polytetrafluoroethylene.

In the embodiment shown in Fig. 4 of the drawings, an O-ring-shaped sealing body is 6% in a groove

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provided on the circumference of the seat ring 50A. The sealing body 64 prevents leakage of the medium between the housing or body 12 and seat ring

In the sealing body 62 shown in FIG. 4 of the drawings, there are several small diameters Openings 68 are provided which extend the full width of the body. Through the openings 68 pressure, either by a liquid or gaseous medium, which builds up behind the sealing body 62 could, dismantled or drained. With throttle valves of known design, especially if they are high When exposed to pressures, it is not uncommon for seals to be completely released due to a sudden release of pressure relocated or moved. Through the openings 68, the can in the annular groove 60 behind the sealing body 62 rapidly relieving pressure, which prevents the seal from shifting or being ejected from the groove will.

In Figures 6 and 6a of the drawings, another jet Design of an improved seat shown. The seat ring 5OC has an outer, in cross section Reduced diameter shoulder 70, which extends in the direction of disk 20 · The flow passage is formed in this area by an inner extension 72 of the housing or body 12 of reduced diameter. Between the approach 70 of the seat ring and the Approach 72 of the body 12 is an annular, elastic sealing body 74. The sealing body 74 can in the substantially rectangular in cross-section and is normally made of an elastic plastic material such as polytetrafluoroethylene «

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In the embodiment of the present invention shown in FIGS. 1, 6 and 6a, the sealing body 7k has a circumferential groove 76 on the outer, rear part. An O-ring 78 is located in this groove in order to prevent the leakage of medium from the seal body.

In the closed position of the disc 20 (FIG. 6), the circumferential sealing surface 22 rests simultaneously on the seat surface 52A of the seat ring and on the sealing body 7k in order to provide both a metal-to-metal seal and a metal-to-metal seal against an elastic body cause.

A plurality of narrow, pressurized openings 80, which are located at a distance from one another, are provided within the seat ring 5OC. The axis of each of the openings 80 is substantially parallel to the axis of the flow passage 14 in the housing of the throttle valve. Each of the openings 80 suitable for applying pressure is connected to the surface of the sealing body 7 k , namely between the projection 70 of the sealing ring and the wall of the flow passage. By using the openings 80, the pressure of the medium which has the inclination to create a leak along the disk 20, applied to the rear side of the elastic sealing body 7k . Thus, the sealing pressure on the seat surface 20 of the disc is increased and the sealing performance of the throttle valve is improved.

In order to prevent a medium from being enclosed between the sealing body 7k and the extension 72 of the housing, several narrow openings 82 are provided on this extension at the same distance from one another

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In Figures δ, 9 and 10 of the drawings is a Another embodiment of the improved seal according to the present invention is shown. At this Embodiment is the elastic, annular seat body 74A compared to that shown in Figures 6 and 6a Seat bodies are designed differently, from two points of view »First of all, the Sealing body partially has a substantially frustoconical, annular sealing surface 84. Each frustoconical Sealing surface 84 formed enables improved contact with the convex on the circumference shaped seating surface 22 of the disc 20 when the disc is in the closed position.

The sealing body 74A according to FIGS. 8, 9 and 10 of the drawings is equipped with a rear surface 86, which is attached to the seat ring 50C. One at a distance parallel front * acii 88 lies on the extension 72 of the housing at. The a.a üMaag located surface 90 of the sealing body rests against flow passage 14. The frustoconical, annular sealing surface 84 of the sealing body rests on the seat surface 22 of the disc when the An inner, cylindrical surface 92 of the sealing body rests against the disc in the closed position annular shoulder 70 of the seat ring at »J second, essential The difference between the embodiment shown in FIGS. 8, 9 and 10 of the drawings consists of the The pressure-releasing openings 94, which are narrow in the durometer and which form the frustoconical, annular sealing surface 84 to the rear surface 86 The effect of the pressure-releasing openings 94 is to that they cut off the pressure that is behind the sealing body 74A could build. This prevents that the sealing body unintentionally from its

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- 15 -Position ie the housing is moved or relocated.

Through the invention described in detail created a much improved throttle valve. For this purpose a device was formed by which of the disc body of the throttle valve can be effectively applied to the seat element. An adjustable one The seat element compensates for manufacturing tolerances or a Wear in the body or housing. The disk can be brought into contact with the seat element or seat body without applying a lateral force. there has been a Improved design of the seat created to provide a more effective seal with the diehtfläfae of the disc achieve. Pressure that builds up behind the seat elements or seat bodies is removed with the aid of a device in order to prevent the sealing body from moving or move sealing elements unintentionally.

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Claims (12)

PATENT CLAIMS f 1 ,,) Throttle body with a housing and axially extending flow passage therein, with coaxially arranged upper and lower shaft openings of smaller diameter, which are arranged perpendicular to the flow passage and with a seat surrounding the flow passage, characterized in that a disc body (2o) in the Flow passage is arranged and formed by a substantially flat, circular body with a seat surface (22) located on the circumference, so that the disc body can be rotated between a closed position, in which the seat surface (22) rests on the seat (18) of the housing, and an open position is, in which the flow runs through the seat, that see integrally upper and lower shaft extensions (3 * 0 perpendicular to the disc body (2o) in the seat surface in the opposite direction, that the shaft extensions (3 * 0 are arranged parallel to one another and spaced apart from one another and each one in alignment, for receiving the shaft di End opening (36) have that an upper shaft body (24A) is arranged rotatably with sealing within the upper shaft opening (16) of the housing and in the opening (36) of the upper shaft attachment receiving the shaft so that the upper shaft body protrudes from the Housing (12) extends outward so that a lower shaft body (24B) is arranged under sealing in the lower shaft opening (16) of the housing and in the opening (36) of the lower shaft attachment receiving the shaft is mounted that the upper and lower shaft attachments of the disk body each have an opening (4o) which receives a pin (38) and which runs perpendicular to the flat disk body, so that an opening (42) receiving the pin (38, 38) is provided in each of the shaft bodies (24A, 24B) that the first pin (38) 209808/0818 in the opening of the upper shaft body and in the opening of the upper disc body shaft attachment is provided, while the second pin is in the opening of the lower shaft body and it is provided in the opening of the lower disk body shaft extension that the shaft extensions (34) of the disk body located openings (36) for receiving the shaft are designed so that they a lateral displacement of the disk body relative to the shaft bodies in a plane perpendicular to the flat part of the disk allow, and that a control device (44) integral with the disc body (2o) opposite the Seat is designed so that it is in the closed position of a part when the disc body rotates of the flap housing can be placed in order to press the disc body (2o) into sealing contact with the seat (18). 2. Throttle valve according to claim 1, characterized in that the housing seat by an inner part enlarged in diameter of the flow passage with internal thread attached to it (48) is formed that a removable seat ring (5o) with an external thread is screwed into the threaded part of the housing is, and that the seat ring (5o) has an annular seat which is sealed to the seat (22) of the disc body can be applied when this is in closed Location is located. 3. Throttle valve according to claim 2, characterized in that the seat surface (52) of the Sitz.ringes of concave cross-section is, and that the seat surface (22) of the disc body (2o) is of convex cross-section. 209808/0818 4. Throttle valve according to claim 3, characterized in that that at least one internally threaded opening of small diameter (54) is arranged in the seat ring (5o), wherein the axis of the opening with a small diameter forms a radius of the ring axis and in the plane of the external thread and that an adjusting screw (56) is screwed into the threaded opening (54) and can be placed against the housing (12) is to prevent unintentional rotational movement of the seat ring (5o) relative to the housing. 5. Throttle valve according to claim 1, characterized in that an annular groove (6o) is arranged in the seat surface of the disc body is that an annular, elastic sealing body (62) is fitted within the annular groove that part of the sealing body (62) normally extends over the annular seat surface (22) of the disc body (2o) when this is in the open position, and that this part is sealed to the seat surface (52) of the housing apply when the disc body is in a closed position Location is located. 6. Throttle valve according to claim 5, characterized in that the sealing body is a plurality of spaced apart Has pressure relief openings of small diameter. 7. Throttle valve according to claim 1, characterized in that the seat of the housing is enlarged by a diameter Inner part of the flow passage is formed with an internal thread that a removable seat ring with external thread in the The threaded part of the housing is screwed in so that the seat ring has a neck with a reduced diameter in cross section, which extends in the direction of the disc body, 209808/0818 and that an elastic, annular sealing body, the inner diameter of which corresponds to the outer diameter of the approach, between the approach of the sealing body and the housing of the annular Flow passage is arranged, the annular sealing body under sealing on the seat surface of the Disc body rests when it is in the closed position. 8. Throttle valve according to claim 7, characterized in that that the seat ring has pressure contact openings of small diameter located at a distance from one another, that the axis these openings parallel to the axial opening of the flow passage ses runs and that each of the pressure contact openings with the elastic sealing body at a point between the approach of the seat body and the housing is in communication. 9. Throttle valve according to claim 7> characterized in that the elastic, annular sealing body partly has an essentially frustoconical, annular sealing surface which rests against the seat surface of the disc body in the closed position. 10. Throttle valve according to claim 9, characterized in that the elastic, ring-shaped sealing body in cross section has a back surface resting against the seat ring and one at a distance from it see parallel front surface has that back and front surface perpendicular to the inner and outer peripheral surfaces lie, and that the elastic, annular sealing body has spaced apart pressure relief openings of small diameter, which with the rear surface of the annular sealing body are in connection. 209808/0818 - 2ο - 11. Throttle valve according to claim 7j, characterized in that that the flow passage in the housing is partially formed by an inner extension of the housing of reduced diameter is, which is located at a distance from the threaded part, and that the annular, elastic sealing body between the approach of the sealing body and the approach of the housing is inserted. 12. Throttle valve according to claim 11, characterized in that the approach of the housing is located at a distance from one another Has pressure relief openings of small diameter. 209808/081 8