Steam filtering structure of main steam valve

Abstract

The utility model relates to the technical field of steam turbine high-pressure main steam valves, in particular to a main steam valve steam filtering structure which comprises a filtering unit arranged in a main steam valve body and used for preventing impurities in steam from entering a valve element. The filtering unit consists of an upper annular bracket, a lower annular bracket and a plurality of annular filtering sections which are rotationally connected between the upper annular bracket and the lower annular bracket; the outer cleaning assembly comprises a fixing frame arranged outside the filtering unit and an outer cleaning arc block which is arranged on the inner side of the fixing frame, is attached to the outer walls of the annular filtering sections and is used for cleaning accumulated impurities; the inner cleaning component comprises an inner cleaning arc plate which is correspondingly arranged in the annular filtering section and is used for cleaning impurities in the filtering holes of the annular filtering section on the upper side of the inner cleaning arc plate. Impurities on the inner surface and the outer surface of the filter unit installed in the main steam valve body can be regularly cleaned, the phenomenon that due to long-time filtering of the filter unit, too much impurities are gathered, and filter holes are blocked is avoided, and the air inlet efficiency and the filter effect are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine high pressure main steam valve technical field, concretely relates to main steam valve steam filter structure. BACKGROUND

[0002] Steam turbine is a kind of large mechanical equipment, is made of shell, rotor, valve component etc., is a kind of rotary steam power equipment, is applied in modern power plant, metallurgical plant, chemical plant, steam turbine needs constantly inhaling steam in the process of operation, and in order to prevent the blockage in main steam valve, special filter structure is also needed to be installed to filter steam.

[0003] But steam filter structure for steam turbine high pressure main steam valve may appear filter screen blockage phenomenon after long time use, affect air intake efficiency.

[0004] The above content is only used to assist understanding the technical scheme of the present application, and does not represent admitting the above content is the closest prior art. UTILITY MODEL CONTENT

[0005] The utility model discloses a steam filter structure for main steam valve.

[0006] In order to solve the above technical problem, the utility model discloses the following technical scheme: main steam valve steam filter structure, including the filter unit for preventing impurities in steam into valve core for being set in main steam valve body, the filter unit is by the upper annular support, lower annular support and the upper annular support, lower annular support between rotationally connected several annular filter sections are formed;

[0007] Outer cleaning assembly, including the fixed frame that is set in the filter unit outside, is set in the fixed frame inboard and is attached several the outer cleaning arc block for cleaning gathered impurities of annular filter section outer wall;

[0008] Inner cleaning assembly, including the inner cleaning arc plate for cleaning the impurities in the filter hole of the annular filter section on the upper side corresponding setting in the annular filter section inside.

[0009] Further, the outer cleaning assembly further includes the first gear ring that is set in the top of the outer cleaning arc block, the first gear wheel that is engaged in the outer end of the first gear ring and is driven by motor;

[0010] The first gear wheel rotation is arranged on the fixed frame.

[0011] Further, the lower end of the inner cleaning arc plate is fixed with the second gear ring, and the outer end of the second gear ring is engaged with the second gear wheel that rotates on the outer cleaning arc block.

[0012] Further, the upper end and the lower end of the second ring gear are respectively provided with a second annular guide rail and a first annular guide rail groove, and the upper end and the lower end of the annular filter section are respectively provided with a first annular guide rail and a second annular guide rail groove matched with the first annular guide rail groove and the second annular guide rail.

[0013] Further, the lower annular support is also provided with a first annular guide rail rotatingly connected with the second ring gear.

[0014] Further, the lower annular support is provided with a negative pressure suction pipe communicated with the inside of the filter unit and provided with an electromagnetic valve, the outside of the negative pressure suction pipe and the lower end of the fixed frame are communicated with a collecting cavity, one side of the collecting cavity is provided with a negative pressure suction port communicated with the outside of the filter unit, and the outer end of the collecting cavity is provided with a negative pressure fan.

[0015] Further, the outer cleaning arc block is slidingly provided with an annular guide rod for supporting the annular rotation of the outer cleaning arc block on the outer wall of the filter unit.

[0016] Compared with the prior art, the utility model has the beneficial effects that: the outer cleaning assembly and the inner cleaning assembly are arranged, the filter unit installed in the main steam valve body can be regularly cleaned in terms of the impurities on the inner and outer surfaces, the normal functional use of the filter unit is ensured, the filter holes are prevented from being blocked due to too much impurity aggregation caused by long-time filtering of the filter unit, and the air intake efficiency and the filtering effect are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification provide further understanding of the utility model, the schematic embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0018] Figure 1 It is the external three-dimensional structure diagram of the whole of an embodiment of the utility model;

[0019] Figure 2 It is the front view cross section structure schematic view of the whole of an embodiment of the utility model;

[0020] Figure 3 It is Figure 2 It is the enlarged structure schematic view of A in the middle;

[0021] Figure 4 It is the three-dimensional structure view of one view of the filter unit of an embodiment of the utility model;

[0022] Figure 5 It is the external power transmission connection structure schematic view of the rotation of the outer cleaning arc block in an embodiment of the utility model;

[0023] Figure 6 It is the structural schematic view of the dust collection of the lower part of the fixed frame in an embodiment of the utility model.

[0024] In the drawing: 100, main steam valve body; 101, valve core; 200, filter unit; 1, upper annular support; 2, lower annular support; 3, annular filter section; 31, first annular guide rail; 32, second annular guide rail groove; 4, outer cleaning assembly; 41, fixed frame; 42, outer cleaning arc block; 43, first gear ring; 44, first gear; 441, motor; 5, inner cleaning assembly; 51, inner cleaning arc plate; 52, second gear ring; 53, second gear; 54, second annular guide rail; 55, first annular guide rail groove; 6, negative pressure suction pipe; 61, collection cavity; 611, negative pressure suction port; 7, negative pressure fan; 8, annular guide rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The embodiments in the application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, if the certain posture changes, the directional indications also change accordingly.

[0027] In addition, if the embodiments of the utility model involve the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, "multiple" means two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the ordinary skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0028] For example, Figures 1-6The utility model discloses a main steam valve steam filter structure, apply on steam turbine, including setting in the main steam valve valve body 100 for preventing the impurity in the steam into the filter unit 200 of valve core 101, the filter unit 200 is by the upper annular support 1, lower annular support 2 and the upper annular support 1, lower annular support 2 between rotating connection several annular filter section 3 constitute, the filter unit 200 is installed on the valve core 101 outer side of the main steam valve valve body 100, and the filter unit 200 is by the upper annular support 1, lower annular support 2 and the upper annular support 1, lower annular support 2 between rotating connection several annular filter section 3 constitute, the filter unit 200 is installed on the valve core 101 outer side of the main steam valve valve body 100,

[0029] The outer cleaning assembly 4 includes a fixed frame 41 arranged outside the filter unit 200, and an outer cleaning arc block 42 arranged inside the fixed frame 41 and attached to the outer walls of the annular filter sections 3 for cleaning accumulated impurities.

[0030] The inner cleaning assembly 5 includes an inner cleaning arc plate 51 arranged inside the annular filter sections 3 for cleaning impurities in the filter holes of the annular filter sections 3.

[0031] In a specific implementation, the filter unit 200 installed on the outer side of the valve core 101 in the main steam valve valve body 100 can effectively prevent impurities in the steam from entering the valve core 101, causing wear, jamming or blocking of the valve seat inside the valve core 101 and the main steam valve valve body 100, and affecting the performance of the main steam valve valve body 100.

[0032] The outer cleaning assembly 4 and the inner cleaning assembly 5 installed outside and inside the filter unit 200 respectively can be used to start the power supply and drive the outer cleaning arc block 42 and the inner cleaning arc plate 51 to clean the impurities on the inner and outer surfaces of the filter unit 200 installed in the main steam valve valve body 100 during maintenance and repair, ensuring the normal functional use of the filter unit 200, preventing excessive accumulation of impurities in the steam caused by long-term filtering of the filter unit 200 from blocking the filter holes, and improving the intake efficiency and filtering effect.

[0033] It should be noted that the filter unit 200 is installed by vertically stacking several annular filter sections 3 between the upper annular support 1 and the lower annular support 2 to form a whole, and the fixed frame 41 is vertically welded outside the upper annular support 1 and the lower annular support 2, and the outer cleaning arc block 42 is installed by turning the top surface and the bottom surface of the fixed frame 41 in a slotted manner.

[0034] In an embodiment, the outer cleaning assembly 4 further includes a first gear ring 43 arranged on the top of the outer cleaning arc block 42, and a first gear 44 engaged with the outer end of the first gear ring 43 and driven by a motor 441.

[0035] The first gear 44 is rotatably arranged on the fixed frame 41. In this way, by welding the first gear ring 43 on the top of the outer cleaning arc block 42 and engaging the first gear 44 with the teeth of the first gear ring 43, starting the motor 441 connected to the central shaft of the first gear 44 through the shaft, driving the first gear 44 and engaging the first gear ring 43 to rotate, so that the outer cleaning arc block 42 welded at the lower end of the first gear ring 43 moves circularly inside the fixed frame 41, realizing the impurity cleaning operation of the outer cleaning arc block 42 on the outer wall of the filter unit 200.

[0036] It should be noted that the first gear ring 43 is installed in a slotted guide on the outer wall of the filter unit 200, and the first gear 44 is rotatably arranged on the inner top surface of the fixed frame 41.

[0037] In an embodiment, the lower end of the inner cleaning arc plate 51 is fixed with a second gear ring 52, and the outer end of the second gear ring 52 is engaged with a second gear 53 rotatably arranged on the outer cleaning arc block 42. In this way, by welding the second gear ring 52 on the lower end of the inner cleaning arc plate 51 and engaging the second gear 53 on the outer side of the second gear ring 52, and rotatably arranging the second gear 53 in the groove formed on the outer cleaning arc block 42, during the circular movement of the outer cleaning arc block 42 driven by the power, the second gear ring 52 will drive the inner cleaning arc plate 51 welded on the second gear ring 52 to clean the filter holes on the inner wall of the annular filter section 3 one by one through the engagement transmission of the second gear 53 and the second gear ring 52, ensuring good cleaning effect.

[0038] In an embodiment, the upper end and the lower end of the second gear ring 52 are respectively provided with a second annular guide rail 54 and a first annular guide rail groove 55, and the upper end and the lower end of the annular filter section 3 are respectively provided with a first annular guide rail 31 and a second annular guide rail groove 32 matched with the first annular guide rail groove 55 and the second annular guide rail 54. In this way, by integrally forming the second annular guide rail 54 on the upper end of the second gear ring 52 and the first annular guide rail groove 55 formed by turning on the lower end of the second gear ring 52, and by integrally forming the first annular guide rail 31 on the upper end of the annular filter section 3 and turning the second annular guide rail groove 32 on the lower end, and by slidingly connecting the second annular guide rail 54 with the second annular guide rail groove 32 and slidingly connecting the first annular guide rail groove 55 with the first annular guide rail 31, a sliding limiting groove is provided between the second gear ring 52 and the adjacent two combined annular filter sections 3, realizing the circular movement function of the second gear ring 52.

[0039] In an embodiment, the lower annular support 2 is also provided with a first annular guide rail 31 rotatably connected to the second gear ring 52. In this way, by integrally forming the first annular guide rail 31 on the top of the lower annular support 2, the annular filter section 3 connected to the lower annular support 2 can be driven to move circularly.

[0040] In an embodiment, the lower annular support 2 is provided with a negative pressure suction pipe 6 which is in communication with the inside of the filter unit 200 and is provided with a solenoid valve, the outside of the negative pressure suction pipe 6 is in communication with a collecting cavity 61 at the lower end of the fixed frame 41, one side of the collecting cavity 61 is provided with a negative pressure suction port 611 which is in communication with the outside of the filter unit 200, and the outer end of the collecting cavity 61 is provided with a negative pressure fan 7. In this way, by turning the negative pressure suction pipe 6 which is in communication with the inside and outside of the lower end of the lower annular support 2, and by turning the collecting cavity 61 which is in communication with the outer end of the negative pressure suction pipe 6 and is provided with a groove at the lower end of the fixed frame 41, and by starting the negative pressure fan 7 which is installed at the outer end of the collecting cavity 61, negative pressure suction is generated to suck the impurities which are cleaned from the inside of the filter unit 200 through the negative pressure suction pipe 6 which is opened by the solenoid valve, and at the same time, the negative pressure suction port 611 which is turned on one side of the collecting cavity 61 sucks the impurities which are cleaned from the outside of the filter unit 200, until the impurities which are cleaned from the inside and outside of the filter unit 200 are collected into the collecting cavity 61.

[0041] In an embodiment, the outer cleaning arc block 42 is provided with a ring guide rod 8 which is used to support the ring direction rotation of the outer cleaning arc block 42 on the outer wall of the filter unit 200. In this way, by turning the ring guide rod 8 which is welded by a support on the outer wall of the filter unit 200, and by turning the sliding groove of the outer cleaning arc block 42 which is in sliding fit with the ring guide rod 8, the ring direction sliding of the outer cleaning arc block 42 on the outer wall of the filter unit 200 is supported.

[0042] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A steam filtration structure for a main steam valve, comprising a filtration unit (200) disposed within the main steam valve body (100) to prevent impurities in the steam from entering the valve core (101), characterized in that: The filter unit (200) is composed of an upper annular support (1), a lower annular support (2), and several annular filter sections (3) rotatably connected between the upper annular support (1) and the lower annular support (2); The external cleaning assembly (4) includes a fixed frame (41) disposed outside the filter unit (200) and an external cleaning arc block (42) disposed inside the fixed frame (41) and attached to the outer wall of several annular filter sections (3) for cleaning accumulated impurities. The internal cleaning assembly (5) includes an internal cleaning arc plate (51) correspondingly disposed inside the annular filter section (3) for cleaning impurities in the filter holes of the annular filter section (3) above it.

2. The main steam valve steam filtration structure according to claim 1, characterized in that: The external cleaning assembly (4) further includes a first gear ring (43) disposed on the top of the external cleaning arc block (42) and a first gear (44) meshing with the outer end of the first gear ring (43) and driven by a motor (441); The first gear (44) is rotatably mounted on the fixed frame (41).

3. The main steam valve steam filtration structure according to claim 1, characterized in that: The lower end of the inner cleaning arc plate (51) is fixed with a second gear ring (52), and the outer end of the second gear ring (52) is engaged with a second gear (53) that rotates on the outer cleaning arc block (42).

4. The main steam valve steam filtration structure according to claim 3, characterized in that: The upper and lower ends of the second toothed ring (52) are respectively provided with a second annular guide rail (54) and a first annular guide rail groove (55), and the upper and lower ends of the annular filter section (3) are respectively provided with a first annular guide rail (31) and a second annular guide rail groove (32) that are adapted to the first annular guide rail groove (55) and the second annular guide rail (54).

5. The main steam valve steam filtration structure according to claim 4, characterized in that: The lower annular bracket (2) is also provided with a first annular guide rail (31) that is rotatably connected to the second gear ring (52).

6. The main steam valve steam filtration structure according to claim 4, characterized in that: The lower annular bracket (2) has a slotted negative pressure suction tube (6) that communicates with the inside of the filter unit (200) and is equipped with a solenoid valve. A collection chamber (61) is provided outside the negative pressure suction tube (6) and communicates with the lower end of the fixed frame (41). A negative pressure suction port (611) that communicates with the outside of the filter unit (200) is provided on one side of the collection chamber (61). A negative pressure fan (7) is provided at the outer end of the collection chamber (61).

7. The main steam valve steam filtration structure according to claim 1, characterized in that: An annular guide rod (8) is slidably provided on the outer cleaning arc block (42) to support the outer cleaning arc block (42) to rotate circumferentially on the outer wall of the filter unit (200).

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