Novel spray pipe type steam-resistant steam seal

Abstract

The utility model discloses a novel spray pipe type steam resistance steam seal, and relates to the technical field of utilization of sealing fluid such as steam. A novel spray pipe type steam resistance steam seal comprises a steam seal body, a cavity is formed in the steam seal body, a rotor is installed in the cavity, a plurality of air inlets are formed in one side of the steam seal body, a plurality of air injection channels are formed in the steam seal body, and the air inlets are all communicated with the interiors of the air injection channels. The multiple sets of sealing structures are fixedly connected into the steam seal body and all matched with the corresponding steam injection channels, by changing the structure of an inner cavity of the steam seal body, steam enters the steam injection channels from the axial air inlet of the steam seal body, the flow speed of the steam is increased after the steam passes through the steam injection channels, and the steam rushes out from the position between the two steam seal rings; and a 90-degree included angle is formed between the rotor boss and the corresponding rotor boss, so that steam convection forms an effect of resisting steam to consume the kinetic energy of steam, the flow resistance is increased, and a good sealing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to utilize sealed fluid, such as steam technical field, especially a new type of spray pipe formula steam resistance steam seal. BACKGROUND

[0002] Turbine has two parts of stator and rotor. In the work, the rotor rotates at high speed, and the stator is fixed, so the gap between the rotor and the stator must be kept, so as not to rub each other, and the steam flows through the turbine level when working, the pressure and temperature decrease gradually, there is a pressure difference on both sides of the baffle, when the dynamic blade has reaction degree, there is also a pressure difference before and after the dynamic blade, in addition to the steam flowing through the channel of the guide vane and the dynamic blade to do work, the device is installed between the dynamic and static parts of the turbine, reduces or prevents steam leakage and air leakage on the vacuum side, in order to reduce the leakage in the above gap, and also to ensure the normal and safe operation of the turbine, various steam seals are set. However, due to the immaturity of the prior art, the air seal cannot be reset when it is hit, and under the long-term impact, the installation position of the seal may be offset if it cannot be automatically reset, thereby increasing the maintenance cost of the turbine.

[0003] Steam seal takes into account the dual responsibility of safety and economy, so people have been exploring new steam seal structure type to solve the dilemma that both can greatly improve the sealing performance and meet the safe operation of the unit, which has long plagued steam turbine professionals. Therefore, the research and popularization and application of efficient and safe steam turbine steam seal have been the goal pursued by steam turbine experts and the goal pursued by each steam turbine manufacturer and each power plant. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a new type of spray pipe formula steam resistance steam seal, which can solve the problem that steam seal takes into account the dual responsibility of safety and economy, so people have been exploring new steam seal structure type to solve the dilemma that both can greatly improve the sealing performance and meet the safe operation of the unit, which has long plagued steam turbine professionals. Therefore, the research and popularization and application of efficient and safe steam turbine steam seal have been the goal pursued by steam turbine experts and the goal pursued by each steam turbine manufacturer and each power plant.

[0005] To achieve the above object, the utility model provides the following technical scheme: a new type of spray pipe formula steam resistance steam seal, comprising:

[0006] Steam seal body, the cavity is formed in the steam seal body, and the rotor is installed in the cavity.

[0007] A plurality of air inlets are formed on one side of the steam seal body, a plurality of air injection grooves are formed in the steam seal body, the plurality of air inlets are in communication with the interiors of the plurality of air injection grooves, a plurality of sealing structures are fixedly connected to the interior of the steam seal body, and the plurality of sealing structures are adapted to the corresponding air injection grooves.

[0008] The sealing structure comprises two steam seal rings, the two steam seal rings are fixedly connected to the interior of the steam seal body, and opposite surfaces of the two steam seal rings are air outlet cavities.

[0009] Preferably, the plurality of air injection grooves are in communication with the interiors of the corresponding air outlet cavities, the connecting interfaces of the plurality of air injection grooves and the corresponding air outlet cavities are convergent groove openings, and the openings of the plurality of air outlet cavities away from the air injection grooves are divergent groove openings.

[0010] Preferably, the cross sections of the plurality of air outlet cavities are funnel-shaped structures.

[0011] Preferably, a plurality of partitions are fixedly connected to the interior of the steam seal body.

[0012] Preferably, recesses are formed on the sides of the plurality of partitions away from the steam seal body.

[0013] Compared with the prior art, the novel steam seal has the following beneficial effects:

[0014] 1. The novel nozzle-type steam seal changes the structure of the interior cavity of the steam seal body, so that steam enters the air injection grooves from the axial air inlets of the steam seal body, the steam flow rate is increased after passing through the air injection grooves, the steam is discharged from between the two steam seal rings to form a 90-degree angle with the corresponding rotor boss position, the steam convection forms a "steam resistance" effect to consume steam kinetic energy and increase flow resistance, and a good sealing effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model is further described below in combination with the drawings and embodiments:

[0016] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0017] Figure 2 It is an air injection groove structure schematic view of the utility model;

[0018] Figure 3 It is an air inlet cross section structure schematic view of the utility model;

[0019] Figure 4 It is a plane structure schematic view of the utility model;

[0020] Figure 5 It is an air inlet structure schematic view of the utility model.

[0021] Mark: 1, the steam seal body; 2, air inlet; 3, rotor; 4, jet groove; 5, convergent groove mouth; 6, expansion groove mouth; 7, partition; 8, steam seal ring; 9, chamber; 10, gas outlet cavity. DETAILED DESCRIPTION

[0022] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings are used to supplement the description of the text part in the form of graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] In the description of the utility model, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like based on the orientation or position relationship shown in the drawings, is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as a limitation on the utility model.

[0024] In the description of the utility model, greater than, less than, more than and the like are understood as not including the number, and above, below and the like are understood as including the number. If the first and the second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0025] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0026] Please refer to Figures 1-5 The utility model provides a technical scheme: a novel nozzle type steam resistance steam seal, comprising:

[0027] The steam seal body 1 is provided with a chamber 9, and the rotor 3 is installed in the chamber 9;

[0028] A plurality of air inlets 2 are formed on one side of the steam seal body 1, a plurality of jet grooves 4 are formed in the inside of the steam seal body 1, the plurality of air inlets 2 are in communication with the inside of the plurality of jet grooves 4, a plurality of sealing structures are fixedly connected in the inside of the steam seal body 1, and the plurality of sealing structures are matched with the corresponding jet grooves 4;

[0029] The sealing structure comprises two steam seal rings 8, the two steam seal rings 8 are fixedly connected in the inside of the steam seal body 1, the opposite surfaces of the two steam seal rings 8 are gas outlet cavities 10, and the cross sections of the plurality of gas outlet cavities 10 are funnel-shaped structures.

[0030] The plurality of jet channels 4 are in communication with the inside of the corresponding air outlet cavity 10, and the connection interface of the plurality of jet channels 4 and the corresponding air outlet cavity 10 is a convergent channel opening 5, and the opening of the plurality of air outlet cavities 10 away from the jet channel 4 is a divergent channel opening 6.

[0031] The plurality of partitions 7 are fixedly connected inside the steam seal body 1, and the plurality of partitions 7 are provided with grooves away from one side of the steam seal body 1.

[0032] Further, when the device is used, the device has a simple structure, is not different from the traditional steam seal installation adjustment mode, is convenient and fast to install, and the innovative design of the new nozzle type steam resistance steam seal changes the structure of the internal cavity 9 of the steam seal body 1, so that the steam enters the jet channel 4 from the axial steam inlet 2 of the steam seal body 1, the steam flow rate is increased after passing through the jet channel 4, and the steam is discharged between the two steam seal rings 8 to form a 90-degree angle with the corresponding rotor 3 boss position, the steam convection forms a “steam resistance steam” effect to consume steam kinetic energy and increase flow resistance, and a good sealing effect is achieved.

[0033] The new nozzle type steam resistance steam seal utilizes the fluid structure to improve the flow speed of the steam in the air outlet cavity 10, reduces the pressure, and also achieves the effect of reducing the air permeability of the steam seal, and guides the steam flow by using different pressure differences in the steam seal cavity.

[0034] The geometry structure of the convergent and then divergent cavity makes the steam in the jet channel 4 increase from subsonic flow to supersonic flow, forms acceleration, the high-speed steam is discharged from the air outlet cavity 10 to produce resistance and form a 90-degree angle with the steam flow direction, so that the discharged gas and the entering steam interact, the effect of increasing the resistance of the inflowing steam and reducing the air intake is achieved.

[0035] The supersonic flow in the divergent channel opening 6 is expansion acceleration, and when the steam is discharged, the flow rate inside the air outlet cavity 10 is continuously increased, and the pressure, density and temperature are continuously reduced; the subsonic flow of the divergent channel opening 6 and the supersonic flow in the convergent channel opening 5 are compression deceleration, the flow rate along the flow channel is continuously reduced, and the pressure, density and temperature are continuously increased (Laval nozzle principle).

[0036] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the technical field without departing from the purpose of the utility model.

Claims

1. A novel nozzle-type vapor barrier seal, characterized in that, include: A steam seal body (1) is provided with a chamber (9), and a rotor (3) is installed in the chamber (9); Multiple air inlets (2) are provided on one side of the steam seal body (1), and multiple jet channels (4) are provided inside the steam seal body (1). The multiple air inlets (2) are all connected to the interior of the multiple jet channels (4). Among them, the internal fixed connection of the steam seal body (1) is a set of sealing structures, and the set of sealing structures are adapted to the corresponding jet channel (4); The sealing structure includes two steam seal rings (8), both of which are fixedly connected inside the steam seal body (1), and the opposite surfaces of the two steam seal rings (8) form the air outlet chamber (10).

2. The novel nozzle-type vapor barrier seal according to claim 1, characterized in that: Each of the multiple jet channels (4) is connected to the interior of the corresponding air outlet chamber (10). The connection interface between the multiple jet channels (4) and the corresponding air outlet chamber (10) is a converging channel opening (5), and the opening of the multiple air outlet chambers (10) away from the jet channels (4) is an expanding channel opening (6).

3. The novel nozzle-type vapor barrier seal according to claim 1, characterized in that: The cross-section of the plurality of air outlet chambers (10) is funnel-shaped.

4. The novel nozzle-type vapor barrier seal according to claim 1, characterized in that: The steam seal body (1) has multiple baffles (7) fixedly connected inside.

5. A novel nozzle-type vapor barrier seal according to claim 4, characterized in that: Each of the partitions (7) has a groove on the side away from the steam seal body (1).

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