JP2004144090A - Valve cooling method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the overcool of a valve by using cost advantageous means for improvement. <P>SOLUTION: During cooling at least one valve 6 which is reciprocated in the axial direction, preferably rotated at the same time, and in which cooling medium liquid passes, the passage of the cooling medium in the valve 6 is interrupted on the way of a reciprocating process each time the valve 6 operates its reciprocating process. Thereby, compact construction and reliable valve operation are achieved and the overcool of the valve is avoided. <P>COPYRIGHT: (C)2004,JPO

Description

According to a first inventive concept, the invention provides an axial reciprocating stroke, preferably simultaneously rotating, through which at least one valve through which a refrigerant liquid is passed, in particular a two-cycle exhaust for large diesel engines. A method for cooling a valve.

Another aspect of the invention is a cooling valve of this type, having a cooling conduit capable of supplying a coolant liquid, guided in its own axis in a corresponding valve housing and extending axially, including a downstream branch and a downstream branch. The invention relates to a device for cooling a valve. The downstream branch can be connected to the corresponding supply chamber or return chamber surrounding the valve axis through the radial inlet and the backward branch through the radial outlet.

冷媒 In the case of a known type of this type of device, the refrigerant is supplied to the valve without interruption. In addition, since the axial width of the liquid supply chamber and the return liquid chamber corresponds to the length of the reciprocating stroke of the valve plus the diameter of the inlet or the outlet, the refrigerant flows through the entire reciprocating stroke. . In the case of a marine engine, the hold space can be invaded and is therefore not preferred because the widths of the supply and return chambers are large and the height of the structure is also relatively high. In this case, if the height of the structure is reduced, the length of the guide is inevitably reduced, which may impair the reliability. Apart from that, there is another very significant drawback. That is, as a result of the constant contact of the valve with the refrigerant, it is possible for the valve surface to cool more strongly at temperatures below the dew point on the valve surface. It can induce the generation of acids that can cause corrosion.

With the above situation as a starting point, the present invention seeks to improve a method of the above kind in such a way that overcooling of the valve is avoided by simple and cost-effective measures.

Another object of the invention is to create a device of the kind described which is not only suitable for carrying out the method according to the invention, but also guarantees a compact design and at the same time high reliability.

According to the present invention, the problem concerning the method is solved by interrupting the passage of the refrigerant through the valve in the middle of the reciprocating stroke for each reciprocating movement of the valve.

According to the present invention, the problems with the device are solved by interrupting the connection between the inlet and the supply chamber and / or the connection between the outlet and the return chamber in the axial reciprocating stroke of the valve.

に よ り With the above measures, the above mentioned disadvantages of the state of the art are completely avoided in a simple and cost-effective way.

Advantageous embodiments and expedient improvements over the basic concept, which is a generic concept, are described in the dependent claims. For example, the axial width of the supply chamber and / or the return chamber can be at least close to the diameter of the corresponding inlet and outlet, respectively. This measure creates a type of sliding valve construction. In this case, the valve axis functions as a control slider which can be moved in the axial direction, whereby the opening or closing of the inlet or outlet can be controlled. If the valve axis is used as a control slider, a simple and cost-effective self-control is advantageously possible. The axial distance between the inlet and the outlet, and thus also between the supply chamber and the return chamber, can advantageously be much shorter in this case than the stroke of the valve. Therefore, a relatively large guiding length is set, but the height of the structure can be kept relatively low.

As another advantageous measure, the axial distance between the supply chamber and the return chamber can be smaller than the diameter of the inlet. This measure advantageously achieves a short-time connection between the supply chamber and the drain chamber at the end of the closing control of the inlet and at the beginning of the opening control. Thus, in the refrigerant guidance of the cooling conduit, a shock end and a shock start of the liquid flow are thereby avoided.

Further advantageous embodiments and expedient improvements to the generic concept of the basic measure are described in the other dependent claims, whose contents can be seen from the examples described below with reference to the drawings. Can be.

図 面 The drawings will be described below.

The main application area of the present invention is, for example, a discharge valve of a large-sized two-cycle diesel engine used as a ship motor. The construction and mode of operation of this type of engine is known per se and therefore does not need to be described in further detail in the context of the present invention.

The cylinder that forms the basis of FIG. 1 has a combustion chamber 1 whose upper boundary is formed by a cylinder cover 3 arranged on a cylinder liner 2. This combustion chamber has a central waste gas outlet 4, which is associated with a discharge valve 6, which cooperates with a valve seat 5, which axially controls the opening and closing of the waste gas outlet 4. You can do up and down movement. The discharge valve 6 of FIG. 1 is depicted in the closed position when the dense tissue surface of the valve receiver 7 is in contact with the corresponding dense tissue surface of the valve seat 5.

The discharge valve 6 has an axis 8 extending upward from the valve receiving plate 7 in a coaxial relationship and engaging with a valve box 9 installed on the cylinder cover 3. The valve box 9 has a discharge path 10 connected to the waste gas discharge port 4, through which the valve axis 8 passes. The valve axis 8 is guided movably in the axial direction in the valve box 9 above the discharge path 10. For this purpose, the valve box is provided with a cylindrical guide device 11 in combination with the valve axis 8 in the upper region of the discharge path 10, the upper end of the valve axis 8 protruding from the valve box 9 and extending in the axial direction of the valve 6. It cooperates with a control device 12 mounted on the valve box 9 to perform a reciprocating stroke movement.

回 転 A rotary device is provided to perform the rotary movement of the valve 6. In the example shown, a radially protruding propeller blade 13 is mounted in the part of the valve axis 8 which passes through the discharge channel 10 for this purpose, which generates a rotary movement under the action of the flowing waste gas.

The valve 6 is cooled by a coolant liquid, preferably in the form of cooling water, which can be passed through the valve 6. Therefore, as can be seen best from FIG. 2, the axis 8 is provided with a cooling hollow portion in the axial direction, which is formed by a cylindrical partition wall 14 into a cylindrical central region and a ring-shaped region surrounding it. It is classified. The valve receiving plate 7 is provided with a liquid flow connecting portion between the lower end of the central area and the lower end of the area surrounding the central area.

(3) The lower end of the pipe forming the partition wall 14, as seen in FIG. 3, enters a chamber 30 provided in the area of the valve base 7 and separated from the cooling cavity by a ring. The valve disc 7 is provided with an annular cooling channel 31 in its outer peripheral area, i.e. near the valve seat, which on the one hand communicates via a radial inlet pipe with the internal space of the pipe forming the partition wall 14. Via a separate inlet tube, on the other hand, with an annular region outside the tube forming the septum 14. The lower end of the tube forming partition 14 may terminate at a distance from the bottom of chamber 30. In the example shown, this tube is located at the bottom of the chamber 30 and has a radial outlet 32.

In this case, the central region inside the partition wall 14 functions as a forward branch pipe 15 through which the liquid flow can pass from above to below, and the outer annular region functions as a backflow branch tube 16 through which the liquid flow can pass from below to above. The upper end area of the downstream branch pipe 15 can be inserted from the periphery of the axis 8 through a radial inflow pipe 17 which is combined with the axis 8. From the backflow branch 16, a radial outflow conduit 18, which engages with the axis 8, branches off.

In this embodiment, which is depicted as particularly preferred, the means for the supply of refrigerant to or from the valve 6 are integrated into the valve box 9 or its tubular guiding device 11 so that the emergency It has a compact structure. In that case, the cylindrical guide device 11 has a liquid supply chamber 19 surrounding the valve axis 8 in a ring shape, which can be connected to the refrigerant supply device through an introduction pipe 20 combined with the valve box 9. It communicates with the inlet line 17 at a position corresponding to the closed position of the valve 6. The outflow line 18 is connected to a return liquid chamber 21 provided in the cylindrical guide device 11 and surrounding the valve axis 8 in a ring shape. The return liquid chamber is connected through a connection pipe 22 to a cooling chamber 23 provided in the valve box 9 and surrounding the discharge path 10, and a discharge pipe 24 branches from the cooling chamber. The liquid supply chamber 19 and the return liquid chamber 21 are configured as grooves that are opened in the radial direction inside the tubular guiding device 11.

The refrigerant is supplied through the introduction pipe 20 as can be seen from the inflow arrow. The refrigerant is delivered through the discharge tube 24, as can be seen from the outflow arrows. The cooling device assigned to the valve 6 and the valve box 9 is connected to a refrigerant circulating device via an introduction pipe 20 and a discharge pipe 24.

At the position of the valve 6 which is the basis of FIGS. 1 and 2, the refrigerant reaches the downstream branch pipe 15 from the liquid supply chamber 19 via the inflow line 17. From the lower end of the forward flow pipe 15, the refrigerant enters the reverse flow pipe 16 via a pipe system provided on the valve receiver 7, from which the refrigerant reaches the return liquid chamber 21 via the discharge pipe 18, From there, it reaches the cooling chamber 23 through the connecting pipe 22 and is further sent out through the discharge pipe 24. The circulation of the refrigerant through the valve 6 and the valve box 9 is as outlined above, but in FIG. 2 it is indicated by the liquid flow arrows.

軸 The axial width of the liquid supply chamber 19 surrounding the valve axis 8 in an annular shape is greatly reduced as compared with the known device, and is close to the diameter of the inflow line 17. 1 and 2, the axial width of the supply chamber 19 corresponds to the diameter of the inlet line 17. Thereby, the above-mentioned flow of the refrigerant in the valve 6 is maintained only when the joint between the inflow line 17 and the corresponding liquid supply chamber 19 is completely or partially coincident. In this case, as described above, the liquid supply chamber is positioned so as to communicate with the inflow pipe 17 at the closed position of the valve 6 which is the basis of FIGS. 1 and 2. When the valve 6 moves downward by the diameter of the inlet line 17, the supply chamber 19 is disconnected from the inlet line 17, whereby the refrigerant circulation through the valve 6 is interrupted.

The axial width of the return liquid chamber 21 corresponds in the example shown to the length of the stroke of the valve 6 plus the diameter of the outlet line 18, so that the outlet line corresponds to the return liquid chamber throughout the entire reciprocating stroke of the valve. It is in communication with 21. On the other hand, however, the connection between the supply chamber 19 and the inflow line 17 is interrupted, so that no refrigerant circulation in the valve 6 takes place.

In order to interrupt the refrigerant circulation, it is conceivable to arrange and configure the return liquid chamber such that the return liquid chamber 21 communicates with the outflow line 18 only in a selected region in the axial reciprocating stroke of the valve 6. . Furthermore, both chambers, namely the supply chamber 19 and the return chamber 21, pass only in selected areas in the axial reciprocating movement of the valve 6 with the corresponding inflow line 17 or outflow line 18; It is also conceivable to arrange and configure both chambers so that they are closed.

、 In order to keep the height of the structure of the valve box 9 as low as possible, the liquid supply chamber 19 and the return liquid chamber 21 are brought closer to each other until the axial distance a between them becomes shorter than the stroke of the valve 6. In this example, which is the basis of FIGS. 1 and 2, this distance a corresponds to the diameter of the inlet line 17 plus a small packing width. Since the distance between the liquid supply chamber 19 and the return liquid chamber 21 is short and the width of the liquid supply chamber 19 and / or the return liquid chamber 21 in the axial direction is small, the height of the structure of the valve box 9 is compared. Even if it is extremely low, as can be seen from FIG. 2, the length of the guiding region 25 of the tubular guiding device 11 can be relatively large. In this case, the guiding region 25 is substantially more than half of the cylindrical guiding device 11 having the returning liquid chamber 21 at the upper position of the guiding region 25 and the liquid supply chamber 19 above and the packing devices for the two chambers. Spanning the length of

The supply chamber 19 and the return liquid chamber 21 are on both sides with a packing ring 26 fitted in the valve axis 8 ensuring a reliable packing between the chambers and of the upper part of the supply chamber 19 and the lower part of the return liquid chamber 21. Has been fixed. Since the axial distance between both chambers is short, one packing ring 26 common to both chambers is sufficient in the region between the two chambers. Further, as shown in FIG. 2, since the guiding region 25 is long and the lower packing ring 26 is located relatively far from the discharge path 10, the temperature load applied to this packing ring is small. The connecting pipe 22 is fixed in the vertical direction by a packing ring 27 surrounding the outer peripheral portion of the tubular guiding device 11.

隙間 In order to prevent foreign matter from entering the packing space formed by the packing ring 27, a gap between the valve axis 8 and the guide region 25 can be oil-sealed. In this case, the temperature load on the oil is relatively small. This type of oil seal for the gap around the valve axis 8 is also possible in the upper end region of the packing space, as can be inferred from the implicit supply pipe in FIG.

装置 The device according to FIG. 4 is basically identical in structure to the device according to FIGS. 1 and 2. Therefore, the same reference numerals are used for the same parts.

4 differs from the arrangement according to FIGS. 1 and 2 in that the axial distance a ′ between the supply chamber 19 and the return liquid chamber 21 is smaller than the diameter of the inlet line 17. As a result, as can be seen from FIG. 4, at the start of the downward movement of the valve 6 and at the end of the upward movement, a situation arises in which the inflow conduit 17 communicates with both the liquid supply chamber 19 and the return liquid chamber 21. In this manner, the impact opening / closing control in the circulation of the refrigerant passing through the valve 6 is prevented.

In both of the embodiments, the liquid supply chamber 19 and the return liquid chamber 21 are formed in an annular shape, so that the inflow line 17 or the outflow line 18 communicates with the corresponding chamber regardless of the rotational position of the valve. ing. In this way, the rotational movement of the valve 6 by the appropriate rotating device does not affect the circulation of the refrigerant passing through the valve 6.

In the illustrated example, the liquid supply chamber 19 and the return liquid chamber 21 are incorporated in the cylindrical guiding device 11 housed in the valve box 9. However, it is also conceivable that the supply chamber 19 and the return chamber 21 are arranged above the valve box 9. To this end, for example, a casing block containing both chambers could be provided at a position between the valve box 9 and the valve operating device 12. In that case, the axial width of the liquid supply chamber and the return liquid chamber could match the width in the above example. Of course, in such a case, the inlet and outlet on the valve side would also have to be arranged correspondingly higher.

The invention is not, of course, limited to the embodiments illustrated.

FIG. 2 is a cross-sectional view of a two-cycle large diesel engine having an attached discharge valve in an upper region of a cylinder. FIG. 2 is a partial enlarged cross-sectional view of FIG. 1 including an upper region of a valve box. It is sectional drawing of a valve lower part area. FIG. 3 is a diagram illustrating an embodiment of an inlet for realizing a liquid flow at short time intervals according to FIG. 2.

Explanation of reference numerals

6 Valve 8 Valve axis 9 Valve box 11 Cylindrical guiding device 14 Partition wall 15 Forward branch 16 Reverse branch 17 Radial inlet 18 Radial outlet 19 Liquid supply chamber 21 Return liquid chamber 25 Induction area 26 Annular packing ring

Claims (16)

A method for cooling at least one valve (6), in particular an exhaust valve for a two-cycle large diesel engine, which performs a reciprocating stroke movement in the axial direction, preferably simultaneously rotating, through which a refrigerant liquid passes, comprising a valve (6). B) the refrigerant passage through the valve (6) is interrupted in the middle of the reciprocating stroke for each reciprocating stroke movement. Method according to claim 1, characterized in that the passage of the refrigerant by the reciprocating stroke movement of the valve (6) is interrupted during the reciprocating stroke. 2. The method according to claim 1, wherein the passage of the refrigerant through the valve (6) takes place at the starting position of the reciprocating stroke corresponding to the closing position of the valve (6), which is interrupted during the course of the reciprocating stroke. Item 3. The method according to Item 2. In a corresponding valve housing (9), a cooling liquid supply-suppliable cooling conduit guided at its own axis (8) and including an axial branch (15) and a countercurrent branch (16) and extending axially. A downstream feed pipe (15) through a radial inlet (17) and a reverse flow pipe (16) through a radial outlet (18) a corresponding feed chamber (19) surrounding the valve axis (8). Or at least one valve (6) through which a refrigerant liquid is passed, preferably rotating at the same time, which can be connected to a return liquid chamber (21), preferably also rotating at the same time, in particular a two-cycle large A device for cooling an exhaust valve for a diesel engine, wherein the connection between the inlet (17) and the supply chamber (19) and / or the connection between the outlet (18) and the return liquid chamber (21) comprises a valve ( 6) Thus apparatus characterized by being interrupted in the middle of a reciprocating stroke in the axial direction is made. The inlet (17) and / or the outlet (18) are closed in the course of the reciprocating stroke with respect to the supply chamber (19) or the return liquid chamber (21) by the reciprocating stroke movement of the valve (6). Device according to claim 4, characterized in that: Characterized in that the axial width of the supply chamber (19) and / or the return liquid chamber (21) is at least approximate to the diameter of the corresponding inlet (17) or outlet (18), respectively. An apparatus according to claim 3. Device according to claim 3 or 4, characterized in that the axial distance between the supply chamber (19) and the return liquid chamber (21) is shorter than the axial movement stroke of the valve (6). The axial width of the chamber corresponds to the diameter of the corresponding inlet and outlet, preferably the axial width of the liquid supply chamber (19) corresponds to the diameter of the corresponding inlet (17). Apparatus according to any one of claims 3 to 5. 4. The method according to claim 3, wherein the axial width of the chamber, preferably the return liquid chamber, is equal to the width of the inlet and outlet corresponding to the stroke of the valve. The device according to any one of the preceding claims. 8. The method as claimed in claim 3, wherein the supply chamber is arranged axially in the region of the inlet when the valve is in the closed position. The apparatus according to claim 1. 9. A method according to claim 3, wherein the axial distance between the supply chamber (19) and the return chamber (21) is smaller than the diameter of the inlet (17). Equipment. Both sides of the liquid supply chamber (19) and the return liquid chamber (21) are fixed by annular packing rings (26), and the packing ring (26) at the center position is also provided in the liquid supply chamber (19). 10. Apparatus according to any one of claims 3 to 9, characterized in that: 11. The device according to claim 3, wherein the liquid supply chamber (19) and the return liquid chamber (21) are connected to a refrigerant circulation device. A cooling hollow portion is provided at the center of the axis (8), which is formed by a cylindrical partition wall (14) to form a central region forming a forward branch pipe (15) and a central area surrounding the central section forming a backward branch pipe (16). The apparatus according to any one of claims 3 to 11, characterized in that the apparatus is divided into a region and a region to be scanned. The liquid supply chamber (19) and the return liquid chamber (21) are arranged in the tubular guidance device (11) of the valve box (9) in a region adjacent to the guidance region (25). Apparatus according to any one of the preceding claims. Device according to claim 13, characterized in that the return liquid chamber (21) is adjacent to the guiding area (25).

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