JPH04116604U - High and medium pressure turbine casing - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the temperature difference between the upper and lower compartments and prevent deformation of the compartment. [Structure] In the circumferential slit 14 that communicates the high-pressure turbine exhaust chamber with the space between the inner and outer turbine casing chambers,
Only the portion near the horizontal joint is opened as shown by reference numeral 14a, and the remaining slit portion has a complete seal structure as shown by reference numeral 14b. This equalizes the differential pressure between the high-pressure turbine exhaust chamber and the space between the inner and outer turbine casings, equalizes the flow rate between the upper and lower casings, and eliminates temperature differences.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a high and intermediate pressure turbine casing of a steam turbine.

0002

[Conventional technology]

Figure 2 shows the overall structure of the high and intermediate pressure turbine casing. In Figure 2, the Steam supplied from a boiler that does not have a Expansion and work are performed in turbine stage 3. The high-pressure exhaust steam is then sent to the high-pressure turbine. The water is guided from the turbine outlet section 4 to the boiler via the high-pressure turbine outlet pipe 5.

0003 In addition, the steam reheated in the boiler flows into the medium pressure turbine inlet pipe 6 and It expands and performs work in the turbine 7, flows out from the intermediate pressure turbine exhaust pipe 8, and is shown in the figure. low-pressure turbine.

0004

[Problem that the idea aims to solve]

In the high- and intermediate-pressure turbine casing described above, conventionally, the high-pressure turbine exhaust chamber 9 and the The outlet part 11 of the pressure dummy 10 is a part provided between the high-pressure outer compartment 12 and the high-pressure inner compartment 13. As shown in FIG. ing.

[0005] Moreover, the space 15 surrounded by the turbine outer casing 12 and the turbine inner casing 13 is large. The high-pressure turbine exhaust chamber 9 has a uniform pressure distribution in the circumferential direction. In this case, the pressure distribution between the upper and lower compartments is affected by the influence of the high-pressure turbine exhaust steam flow. are different. In FIG. 2, the pressure on the upper compartment side is higher than on the lower compartment side. did Therefore, the differential pressure in the slit 14 differs depending on the upper and lower compartments, and the balance of flow rates differs. As a result, the temperature distribution in the upper and lower compartments is different. Ru.

[0006] If there is a temperature difference between the upper and lower casings, the turbine Since the outer casing 12, the turbine inner casing 13, etc. are deformed, clearing of each part of the turbine is necessary. changes in the circumferential direction, causing shaft vibration problems due to fin contact and clearance problems. There were problems such as a decline in performance due to excessive use.

[0007] This invention was devised to solve the problems of the conventional technology. In the pressure turbine casing, this prevents deformation of the casing due to the temperature difference between the upper and lower casings. The purpose is to prevent shaft vibration and performance deterioration.

[0008]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has developed a high-pressure turbine exhaust chamber and a turbine inside and outside. The high and medium pressure turbine casing communicates with the space between the casings through a circumferential slit. Then, open only the part of the slit near the horizontal joint and open the remaining part of the slit. It has a core structure.

[0009]

[Effect]

According to the above method, the slit has a structure in which only the part near the horizontal joint is open. , so the high pressure turbine exhaust chamber and the inside of the turbine acting between the slits The pressure difference between the outer compartment and the space between the outer compartments is the same, and there is no difference between the upper and lower compartments. As a result, this The flow rate flowing through the slit is constant, and there is no imbalance between the upper and lower compartments. If the flow rate becomes uniform, there will be no temperature difference between the upper and lower compartments, resulting in a uniform temperature distribution. As a result, deformation of the passenger compartment can be prevented.

0010

【Example】

An embodiment of the present invention will be described in detail below with reference to FIG. Figure 1 is similar to Figure 2. The structure of the present invention is shown along the line A-A, and is different from FIG. 3 showing the conventional structure. Therefore, FIG. 2 will also be referred to in the following description.

[0011] In Fig. 2, the high pressure turbine is -The bin exhaust chamber 9 is communicated with the space 15 between the turbine inner and outer chambers 13 and 12. The differential pressure across the 14 slits differs between the upper and lower compartments, and the flow rate across the 14 slits differs. ing. Depending on the case, the flow direction of the slits may also be different between the upper and the disembarking compartment sides.

0012 Therefore, in the present invention, as shown in FIG. 1, in this slit 14, the pressure difference is Only the part near the horizontal joint, which has almost no openings, is opened as shown by reference numeral 14a, and the remaining parts are opened. The slit portion has a completely sealed structure as shown by reference numeral 14b.

[0013] Thus, according to the present invention, the effective slit portion 14a is provided in the horizontal joint portion. Therefore, the effect of pressure imbalance between the upper and lower chambers of the high-pressure turbine exhaust chamber 9 is Therefore, the differential pressure in the effective slit portion 14a is the same between the upper and lower compartments. the result, The internal flow balance between the upper and lower compartments is the same, and there is no temperature difference between the upper and lower compartments. , no deformation of the passenger compartment occurs.

[0014]

[Effect of the idea]

As described above, according to the present invention, the high-pressure turbine exhaust chamber and the turbine inner and outer casing chambers In the high and intermediate pressure turbine casing, the space between the Then, open only the part of the slit near the horizontal joint and seal the remaining part. The structure is designed to equalize the flow rate between the upper and lower compartments and eliminate temperature differences. This prevents deformation of the casing and maintains appropriate clearance between each part of the turbine. This prevents shaft vibration due to fin contact and performance deterioration due to excessive clearance. This has the effect of preventing such problems and improving reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a high and intermediate pressure turbine casing according to the present invention along line A-A in FIG. 2;

FIG. 2 is a sectional view showing the overall structure of a high and intermediate pressure turbine casing.

FIG. 3 is a cross-sectional view showing a conventional high and intermediate pressure turbine casing along line A-A in FIG. 2;

[Explanation of symbols]

9 High pressure turbine exhaust chamber 12 Turbine outer casing 13 Turbine interior 14 slit 14a opening 14b Seal part 15 Space between the interior and exterior of the vehicle

Claims (1)

[Scope of utility model registration request] Claims: 1. In a high- and intermediate-pressure turbine casing in which a high-pressure turbine exhaust chamber and a space between an inner and outer turbine casing communicate with each other via a circumferential slit, only a portion of the slit near a horizontal joint is opened; A high and intermediate pressure turbine casing characterized in that the remaining portion has a sealed structure.