201007034 六、發明說明： 【發明所屬之技術領域】 本發明係有關具有流路之逆止閥，該流路形成於外 殼，供介質通過，且其中配置一可動閥體，其用來藉由壓 抵於閥座，切斷流路。此外，本發明係有關具有此一逆止 閥之燃氣輪機之燃料供應系統。 【先前技術】 於燃氣輪機之燃料供應系統中，各燃燒器及各燃燒器 載台存在有接近燃燒器之多數關閉元件（此等關閉元件配 置在距燃燒器連接最大達lm(米）處）。接近燃燒器之多數關 閉元件係防止在相關燃氣輪機之燃燒室中所產生燃料氣體 的回流入燃料進給線，或於其他應用中，防止清潔介質從 燃料進給線進入燃燒器。 逆止閥被用來作爲關閉元件。然而，可能發生逆止閥 之功能未充份確保之操作狀態（例如燃燒室壓力過低）。 亦已知使用電磁閥作爲關閉元件。然而，此等電起動 閥因接近燃燒器之高溫負載而有高的故障率。 【發明內容】 本發明之目的在於硏創一種關閉元件，其克服上述缺 點，並因此可接近燃燒器配置。特別是，關閉元件可在所 有操作條件下以操作上安全之方式關閉。 根據本發明之目的藉申請專利範圍第1項之逆止閥並 藉申請專利範圍第6項之燃氣輪機之燃料供應系統達成。 根據本發明，提供一種逆止閥，其具有：流路，形成 201007034 於外殼，供介質通過，其中配置一可動閥體，其用來藉由 壓抵於閥座，切斷該流路；以及控制元件，可位移於外殼 中，藉此，閥體可被壓抵於閥座，且其可藉輔助介質操作。 此外，根據本發明之目的藉具有根據本發明之逆止閥之燃 氣輪機的燃料供應系統達成。 根據本發明之逆止閥甚至可安置在燃燒器前。根據本 發明透過輔助介質之起動縱使在接近燃燒器的高環境溫度 下仍顯著地較電起動更可靠，此乃因爲操作輔助介質所需 輔助介質之高壓可產生在溫度明顯低於接近燃燒器區域的 區域。因此，根據本發明，能以僅須略微修改之標準閥作 爲逆止閥之基礎》 於根據本發明之第一有利解決方案發展情況下，控制 元件可藉輔助介質，逆著介質之流向位移。 於根據本發明之第二有利解決方案發展情況下，在逆 止閥之外殼設置用以進給輔助介質之開口。開口可有利地 提供來使輔助介質可在逆止閥之安裝狀態下通過該開口到 達外殻之內部。 於根據本發明之第三有利解決方案發展情況下，控制 元件具有被輔助介質作用的活塞面。有利地，活塞面係涵 蓋控制元件之徑向環形面，該控制元件較佳地設成圓筒形 活塞。 於根據本發明之第四有利解決方案發展情況下，用以 較低流入壓力下切斷流路之彈簧設在控制元件與外殼之 間。彈簧張緊控制元件，使其閥體抵住相關閥座。 201007034 換言之，根據本發明，提議一種新型逆止閥，其（相對 於習知逆止閥）藉一額外入口改進，可控制之輔助介質（特 別是空氣、水及/或液壓油）可透過該額外入口導入。於此 情況下，逆止閥設計成透過額外入口導入之輔助介質可作 用於活塞上，只要輔助介質之壓力高於逆止閥入口之壓 力，逆止閥即可藉此，因輔助介質所發生力量而保持關閉。 於此情況下，例如球被壓緊於閥座。 茲參考所附示意圖式，隨後更詳細說明根據本發明解 決方案之例示性實施例。 【實施方式】 於第1圖中顯示具有中空圓筒形外殼12之逆止閥10, 其於一端面具有形式爲開口之入口 14，於另一端面具有形 式爲又一開口之出口 16。逆止閥10係固定燃氣輪機之燃 料供應系統的一部分（未另外顯示）。於此情況下’入口 14 用來將形式爲燃料油之液態燃料導入外殻12內’且出口 1 6用來將燃料轉送至燃燒器（未圖示）。於此情況下’複數 個逆止閥10均個別與相關燃燒器聯接。 於外殻12內部，在入口 14側形成閥座18’能以密封 作用對設計成球的閥體20施力或將其壓抵於該閥座18 上，以選擇性切斷自入口 14經由外殼12至出口 16之流路 22，並防止燃料自出口 16漏出。 藉外殼12中之控制元件24將此例中的閥體20壓抵於 閥座18，控制元件接著藉支承並預張緊的彈簧元件26，於 外殻12中沿面朝出口 16的方向位移。在入口 14處出現相 201007034 當高燃料壓力情況下’球20被舉離閥座18並釋放流路22， 此情形顯示於第1圖中。於較低燃料壓力情況下’流路22 保持關閉。 若於特定操作狀態情況下’縱使高壓或增壓’介質或 燃料（入口 14相對於出口 16)仍被阻止，控制元件24即於 其圓周上設有環形活塞面28’該環形活塞面28於其外周 面上相對於外殻12密封》此外，形成另一開口 30於外殻 12上，且其導入形成在活塞面28前面的壓力室32。藉由 進給不可壓縮或替代地甚至可壓縮之輔助介質，除了在彈 簧元件26的力量下，控制元件24沿閥座1 8之方向位移。 結果，即使更高燃料壓力出現於入口 14，閥體20仍選擇 性切斷流路22。 【圖式簡單說明】 第1圖顯示根據本發明逆止閥之例示性實施例之示意 縱剖視圖，以及 第2圖顯示第1圖中細部II之放大立體圖。 【主要元件符號說明】 10 逆止閥 12 外殼 14 入口 16 出口 18 閥座 20 閥體 22 流路 201007034 24 控 制 元 件 26 彈 簧 元 件 28 活 塞 面 30 開 □ 32 壓 力 室201007034 VI. Description of the Invention: [Technical Field] The present invention relates to a check valve having a flow path formed in a casing for a medium to pass therethrough, and wherein a movable valve body is disposed therein for pressing Abut the valve seat and cut off the flow path. Further, the present invention relates to a fuel supply system for a gas turbine having such a check valve. [Prior Art] In a fuel supply system for a gas turbine, each of the burners and each of the burner stages has a plurality of closing elements close to the burner (the closing elements are disposed at a distance of up to lm (meters) from the burner). Most of the shut-off elements in proximity to the burner prevent backflow of fuel gas generated in the combustion chamber of the associated gas turbine into the fuel feed line, or in other applications, prevent cleaning medium from entering the combustor from the fuel feed line. A check valve is used as the closing element. However, it may happen that the function of the check valve is not sufficiently ensured (e.g., the combustion chamber pressure is too low). It is also known to use a solenoid valve as a closing element. However, such electric start valves have a high failure rate due to the high temperature load approaching the burner. SUMMARY OF THE INVENTION It is an object of the present invention to create a closure element that overcomes the above-discussed deficiencies and thus has access to a burner configuration. In particular, the closing element can be closed in an operationally safe manner under all operating conditions. According to the object of the present invention, the check valve of the first application of the patent scope is obtained by the fuel supply system for the gas turbine of the sixth application of the patent scope. According to the present invention, there is provided a check valve having a flow path forming a 201007034 in a casing for passage of a medium, wherein a movable valve body is disposed for cutting the flow path by being pressed against the valve seat; The control element is displaceable in the housing whereby the valve body can be pressed against the valve seat and it can be operated by the auxiliary medium. Furthermore, it is achieved according to the object of the invention by a fuel supply system for a gas turbine having a check valve according to the invention. The check valve according to the invention can even be placed in front of the burner. The activation of the auxiliary medium according to the invention is still significantly more reliable than the electrical starting at high ambient temperatures close to the burner, since the high pressure of the auxiliary medium required to operate the auxiliary medium can be produced at temperatures significantly below the vicinity of the burner. Area. According to the invention, the standard valve, which requires only a slight modification, can be used as the basis for the check valve. In the development of the first advantageous solution according to the invention, the control element can be displaced against the flow direction of the medium by means of the auxiliary medium. In the development of the second advantageous solution according to the invention, an opening for feeding the auxiliary medium is provided in the outer casing of the check valve. The opening may advantageously be provided to allow the auxiliary medium to pass through the opening to the interior of the outer casing in the installed state of the check valve. In the case of the development of the third advantageous solution according to the invention, the control element has a piston face which is acted upon by the auxiliary medium. Advantageously, the piston face covers the radial annular face of the control element, which control element is preferably provided as a cylindrical piston. In the development of the fourth advantageous solution according to the invention, a spring for shutting off the flow path at a lower inflow pressure is provided between the control element and the outer casing. The spring tensions the control element so that its valve body abuts the associated valve seat. 201007034 In other words, according to the invention, a new check valve is proposed which (with respect to the conventional check valve) is modified by an additional inlet through which the controllable auxiliary medium (especially air, water and/or hydraulic oil) can pass Additional entrances are imported. In this case, the check valve is designed to act on the piston through the auxiliary medium introduced through the additional inlet. As long as the pressure of the auxiliary medium is higher than the pressure at the inlet of the check valve, the check valve can be used for the auxiliary medium. Keep it closed. In this case, for example, the ball is pressed against the valve seat. The exemplary embodiments in accordance with the present invention are described in more detail below with reference to the accompanying drawings. [Embodiment] A check valve 10 having a hollow cylindrical outer casing 12 is shown in Fig. 1, which has an opening 14 in the form of an opening at one end face and an outlet 16 in the form of a further opening at the other end face. The check valve 10 is part of a fuel supply system for a gas turbine (not shown). In this case, the inlet 14 is used to introduce liquid fuel in the form of fuel oil into the outer casing 12 and the outlet 16 is used to transfer fuel to a burner (not shown). In this case, the plurality of check valves 10 are individually coupled to the associated burners. Inside the outer casing 12, a valve seat 18' is formed on the inlet 14 side to apply a force to the valve body 20 designed as a ball or to press it against the valve seat 18 for selective shut-off from the inlet 14 via The flow path 22 of the outer casing 12 to the outlet 16 prevents fuel from leaking out of the outlet 16. The valve body 20 in this example is pressed against the valve seat 18 by the control element 24 in the housing 12, which is then displaced in the housing 12 in the direction of the outlet 16 by the supported and pretensioned spring element 26. . The phase appears at the inlet 14 201007034 The ball 20 is lifted off the valve seat 18 and releases the flow path 22 when high fuel pressure is present, as shown in Figure 1. Flow path 22 remains closed at lower fuel pressures. If, under certain operating conditions, the 'high pressure or pressurized' medium or fuel (inlet 14 relative to the outlet 16) is still blocked, the control element 24 is provided with an annular piston face 28' on its circumference. The outer peripheral surface thereof is sealed relative to the outer casing 12. Further, another opening 30 is formed in the outer casing 12 and introduced into the pressure chamber 32 formed in front of the piston face 28. By feeding an incompressible or alternatively compressible auxiliary medium, the control element 24 is displaced in the direction of the valve seat 18 except for the force of the spring element 26. As a result, even if a higher fuel pressure occurs at the inlet 14, the valve body 20 selectively cuts off the flow path 22. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic longitudinal cross-sectional view showing an exemplary embodiment of a check valve according to the present invention, and Fig. 2 is an enlarged perspective view showing a detail II in Fig. 1. [Main component symbol description] 10 check valve 12 outer casing 14 inlet 16 outlet 18 valve seat 20 valve body 22 flow path 201007034 24 control element 26 spring element 28 piston surface 30 open □ 32 pressure chamber