High pressure thermal power steam trap sealing graphite gasket

Abstract

The utility model relates to steam trap sealing technical field relates to a kind of high-pressure thermal power steam trap sealing graphite gasket, comprising: sealing gasket and positioning sleeve, the sealing gasket includes inner sealing ring, outer sealing ring and the connecting rod being arranged between the inner sealing ring and outer sealing ring, water inlet hole is passed through and is arranged in the inner sealing ring middle part, arc drainage groove is formed between the inner sealing ring and the outer sealing ring, the positioning sleeve is positioned between the inner sealing ring and outer sealing ring and is positioned.The utility model significantly reduces the effective sealing contact area under the premise of providing equivalent or even better sealing effect, directly reduces the bolt fastening torque required to realize reliable sealing, thereby optimizing overall sealing performance and reducing assembly requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam trap sealing technical field relates to a high pressure thermal power steam trap sealing graphite gasket. BACKGROUND

[0002] The thermal power steam trap is favored by the market because of its simple structure, light weight, small size, low cost, and low failure rate, and has become the most widely used type of trap.

[0003] Among them, the replaceable valve seat and valve piece of the high-pressure valve seat type thermal power steam trap further improve the maintenance convenience - when repairing, the pipeline does not need to be disassembled, only the connecting bolts of the valve cover and the valve body need to be loosened, and the valve seat and the valve piece can be taken out for repair or overall replacement. This design greatly reduces the repair time and cost, and ensures the efficient repair and stable operation of the drain system.

[0004] The existing steam trap, as shown in the figure, needs to realize reliable sealing between the valve seat, the valve body, the valve cover and the condensate inlet and outlet, which significantly increases the complexity of product design and manufacturing, and the specific performance is as follows: Figure 1

[0005] 1. The movable valve seat 3 and the water inlet and outlet need to be sealed by independent graphite winding gasket 102 respectively;

[0006] The valve seat 3 and the valve cover 1 need to be sealed by graphite gasket 101 with metal layer;

[0007] Multiple sealing surfaces significantly increase the risk of leakage and frequent internal / external leakage;

[0008] 2. The gasket materials and sealing specific pressure requirements of different sealing sites 101, 102 are different, and the design coordination is difficult;

[0009] The pre-tightening force simultaneously satisfies the sealing requirements of the three independent gaskets. When the pre-tightening force is insufficient, it will cause sealing failure, and when the pre-tightening force is too large, it will cause the gasket to be crushed or the valve body to be deformed;

[0010] 3. The manufacturing deviation of multiple gasket thicknesses and the compression and rebound difference of soft sealing materials result in poor batch production consistency. UTILITY MODEL CONTENTS

[0011] The utility model discloses a high pressure thermal power steam trap sealing graphite gasket to solve the problems of prior art.

[0012] ​The utility model discloses a high pressure thermal power steam trap sealing graphite gasket, including: sealing gasket and positioning sleeve, the sealing gasket includes inner sealing ring, outer sealing ring and the connecting rod of setting between inner sealing ring and outer sealing ring, the water inlet hole of through arrangement is provided in the middle part of inner sealing ring, the arc drainage groove is formed between inner sealing ring with outer sealing ring, positioning sleeve sets up between inner sealing ring and outer sealing ring and positions.

[0013] Further improvement, the outer side of the inner sealing ring is provided with an arc positioning groove one, the inner side of the outer sealing ring is provided with an arc positioning groove two corresponding to the arc positioning groove one, and the positioning sleeve is arranged between the arc positioning groove one and the arc positioning groove two.

[0014] Further improvement, the outer side of the positioning sleeve is simultaneously interference-fitted with the inner sealing ring and the outer sealing ring.

[0015] Further improvement, the upper end of the arc positioning groove one and the arc positioning groove two is provided with a chamfer.

[0016] Further improvement, the sealing gasket is made of stamping 304 stainless steel and flexible graphite coated on the outer side of the stamping 304 stainless steel.

[0017] Compared with the prior art, the utility model has the advantages that under the premise of providing equivalent or even better sealing effect, the effective sealing contact area is significantly reduced, the bolt fastening torque required for realizing reliable sealing is directly reduced, the overall sealing performance is optimized, and the assembly requirement is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structure diagram of the existing thermal power steam trap;

[0019] Figure 2 is the structure diagram of the utility model applied in the thermal power steam trap;

[0020] Figure 3 is the structure diagram of the utility model.

[0021] In the figure, 1, valve body; 11, inlet; 12, outlet; 2, valve cover; 21, compression step; 3, cavity; 31, flow chamber groove; 4, valve seat; 41, support step; 42, inlet flow channel; 43, outlet flow channel; 5, sealing gasket; 51, inner sealing ring; 511, water inlet; 512, arc-shaped positioning groove I; 52, outer sealing ring; 521, arc-shaped drainage groove; 522, arc-shaped positioning groove II; 53, connecting rod; 6, filter cavity; 61, filter screen; 62, plug; 7, positioning sleeve; 8, winding gasket; 9, valve piece; 101, graphite winding gasket; 102, graphite gasket. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0023] In the description of the present application, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The following will be described in combination with the embodiments and drawings Figures 1-3 The technical scheme of the present application will be further described.

[0025] Example 1

[0026] A high-pressure thermal power steam drain valve sealing graphite gasket, comprising: a sealing gasket 5 and a positioning sleeve 7, the sealing gasket 5 comprises an inner sealing ring 51, an outer sealing ring 52 and a connecting rod 53 arranged between the inner sealing ring 51 and the outer sealing ring 52, the inner sealing ring 51 is provided with a water inlet hole in the middle, the inner sealing ring 51 and the outer sealing ring 52 form an arc-shaped drainage groove 521, and the positioning sleeve 7 is arranged between the inner sealing ring 51 and the outer sealing ring 52 for positioning.

[0027] Please refer to Figure 2Taking a high-pressure valve seat thermodynamic steam trap using the aforementioned sealing graphite gasket as an example, it includes: a valve body 1 and a valve cover 2. The valve body 1 is provided with an inlet 11 and an outlet 12. A cavity 3 is provided between the valve body 1 and the valve cover 2. A valve seat 4 is provided in the cavity 3. A supporting step 41 is provided on the valve seat 4. A pressing step 21 is provided on the valve cover 2. The pressing step 21 is pressed against the supporting step 41. A valve plate 5 is provided above the valve seat 4. An inlet flow channel 42 and an outlet flow channel 43 are opened in the valve seat 4. The inlet flow channel 42 is connected to the inlet 11, and the outlet flow channel 43 is connected to the outlet 12.

[0028] The core advantage of this steam trap lies in its independent design of the valve body 1 and the valve seat 4, with the valve seat 4 reliably fixed and sealed on the valve body 1 by the sealing graphite gasket 5. This design brings significant maintenance convenience: during maintenance, it is not necessary to disassemble the entire steam trap from the pipeline; simply loosen the connecting bolts between the valve cover 2 and the valve body 1 to remove the valve seat 4 and valve plate 5 for inspection or direct replacement of new parts. This greatly simplifies the maintenance process, shortens maintenance time, reduces maintenance costs, ensures efficient repair and stable operation of the steam trap system, and significantly reduces maintenance expenses. Furthermore, the independent design of the valve body 1 and the valve seat 4 allows the valve seat 4 to be made of a better material for high-temperature and high-pressure steam conditions and can be heat-treated separately, further simplifying the manufacturing process.

[0029] The key innovation of this utility model lies in the use of the sealing graphite gasket 5 with the specific structure described above, which achieves the following breakthrough advantages:

[0030] Eliminating the soft sealing gasket between the valve cover and the valve seat: Through the structural design of the sealing graphite gasket 5, the traditional soft sealing gasket between the valve cover 2 and the valve seat 4 is completely eliminated, ensuring a high degree of consistency in the volume of the key transformer chamber of the steam trap in mass production, while focusing the sealing attention on the key sealing interface between the valve cover 2 / valve seat 4 and the valve body 1.

[0031] Innovative annular sealing ring structure: The sealing graphite gasket 5 adopts a unique annular sealing ring design with an inner sealing ring 51 and an outer sealing ring 52. The sealing at the inlet 11 is undertaken by the inner sealing ring 51; the sealing at the outlet 12 and between the valve cover 2 and the valve body 1 is achieved by the inner sealing ring 51 and the outer sealing ring 52 together.

[0032] Single gasket controls thickness deviation: The design of a single annular sealing ring gasket effectively controls the manufacturing deviation of the overall gasket thickness, completely avoiding the cumulative error and sealing failure risk caused by the use of multiple specifications of sealing gaskets and the existence of multiple sealing mating surfaces in traditional solutions;

[0033] Optimized sealing contact and assembly: While providing the same or even better sealing effect, this utility model significantly reduces the effective sealing contact area, directly reducing the bolt tightening torque required to achieve a reliable seal, thereby optimizing the overall sealing performance and reducing assembly requirements.

[0034] As a further preferred embodiment, the outer side of the inner sealing ring 51 is provided with an arc-shaped positioning groove 512, and the inner side of the outer sealing ring 52 is provided with an arc-shaped positioning groove 522 corresponding to the arc-shaped positioning groove 512. The positioning sleeve 7 is disposed between the arc-shaped positioning groove 512 and the arc-shaped positioning groove 522.

[0035] Specifically, the positioning sleeve 7 can be precisely embedded between the inner sealing ring 51 and the outer sealing ring 52, ensuring the stable positioning of the sealing gasket 5 within the valve body. This not only enhances the sealing effect but also simplifies the installation process and improves assembly accuracy.

[0036] As a further preferred embodiment, the outer side of the positioning sleeve 7 is simultaneously press-fitted with both the inner sealing ring 51 and the outer sealing ring 52 to ensure that the positioning sleeve 7 remains stable during operation, preventing loosening or displacement, thereby enhancing the sealing performance.

[0037] As a further preferred embodiment, the upper ends of the arc-shaped positioning groove 512 and the arc-shaped positioning groove 522 are provided with chamfers. The chamfer design helps to facilitate the smooth installation of the positioning sleeve 7, while reducing stress concentration and improving the durability and reliability of the structure.

[0038] As a further preferred embodiment, the sealing gasket 5 is made of stamped 304 stainless steel and flexible graphite covering the outside of the stamped 304 stainless steel. The high strength and corrosion resistance of 304 stainless steel and the excellent sealing and high temperature resistance of flexible graphite significantly improve the overall performance of the sealing gasket 5, making it perform well in high-pressure thermodynamic steam traps.

[0039] During testing, this invention utilizes the LT60S thermodynamic steam trap as an example. Its maximum operating pressure is 6.0 MPa, maximum discharge capacity is 450 kg / h, and inlet diameter is 4.4 mm. The maximum height H of the valve disc from the valve seat during discharge must be designed to ensure no throttling occurs during fluid flow, thus reducing resistance. Based on experience, the H value should be around 0.785D1. D1 / (πWithin the range of D1)+0.5~1, the actual design is 2.10mm. Experiments show that for steam traps with multiple sealing gaskets, under the same preload, the total shrinkage of the sealing gaskets varies by 0.1-0.2mm, resulting in a 5-10% change in the transformer chamber volume and causing deviations in the opening and closing frequency. An excessively high H value increases pressure loss, creates eddies, consumes fluid velocity, increases the transformer chamber volume and total heat value, prolongs the valve opening and closing interval, reduces the frequency, and is detrimental to condensate drainage. Therefore, this invention, while meeting sealing requirements, is of great significance for ensuring the operational stability of the steam trap.

[0040]

[0041] In summary, this utility model solves the problem of core performance fluctuation caused by material flexibility and structural redundancy in traditional solutions through a rigid monolithic design.

[0042] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A high-pressure thermodynamic steam trap sealing graphite gasket, characterized in that, include: A sealing gasket and a positioning sleeve are provided. The sealing gasket includes an inner sealing ring, an outer sealing ring, and a connecting rod disposed between the inner sealing ring and the outer sealing ring. A water inlet hole is provided through the middle of the inner sealing ring. An arc-shaped drainage groove is formed between the inner sealing ring and the outer sealing ring. The positioning sleeve is disposed between the inner sealing ring and the outer sealing ring for positioning.

2. The high-pressure thermodynamic steam trap sealing graphite gasket according to claim 1, characterized in that, An arc-shaped positioning groove one is provided on the outer side of the inner sealing ring, and an arc-shaped positioning groove two corresponding to the arc-shaped positioning groove one is provided on the inner side of the outer sealing ring. The positioning sleeve is disposed between the arc-shaped positioning groove one and the arc-shaped positioning groove two.

3. The high-pressure thermodynamic steam trap sealing graphite gasket according to claim 1, characterized in that, The outer side of the positioning sleeve is simultaneously press-fitted with both the inner and outer sealing rings.

4. The high-pressure thermodynamic steam trap sealing graphite gasket according to claim 2, characterized in that, The upper ends of both the first and second arc-shaped positioning grooves are chamfered.

5. The high-pressure thermodynamic steam trap sealing graphite gasket according to claim 1, characterized in that, The sealing gasket is made of stamped 304 stainless steel and flexible graphite covering the outside of the stamped 304 stainless steel.

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