Filter screen flange fastening device

Abstract

The utility model belongs to the technical field of filter screen devices of water feeding pumps, and discloses a filter screen flange fastening device. The filter screen flange fastening device comprises a body flange and a blind flange, wherein the blind flange is connected with the body flange through a bolt. A groove is formed in the face, away from the water feeding pump, of the body flange, and a protruding part is arranged on the face, close to the body flange, of the blind flange and can be inserted into the groove. Compared with the prior art, due to the fact that the bolts expand when heated, the strength of the connecting body flange and the blind flange is reduced, and the strength of the filter screen flange fastening device is reduced. According to the filter screen flange fastening device, the body flange and the blind flange are respectively provided with the groove and the convex part, so that the connection strength of the body flange and the blind flange is improved, the strength of the filter screen flange fastening device is further improved, the phenomena of floating and dripping of a filter screen are prevented, and the safety of a unit is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of water supply pump filter devices, in particular to a filter flange fastening device. Background Art

[0002] At present, due to the continuous advancement of coal-fired thermal power technology, large-capacity, high-parameter coal-fired thermal power units are gradually being established. With the continuous development of new energy, the proportion of new energy power generation has gradually increased, resulting in large-capacity, high-parameter thermal power units facing deep peak regulation and large changes in unit load. However, during the deep peak regulation process, the thermal system parameters of coal-fired thermal power units will change dramatically. One of the effects is that the pressure and temperature of the water supply system fluctuate greatly, causing the equipment in the system to change to varying degrees due to thermal expansion and contraction. The filter device in the water supply system is one of them, especially the filter device at the inlet of the water supply pump.

[0003] In the prior art, the feed pump inlet filter flange is fastened by bolts, and a flat gasket is installed between the nut and the flange. During the peak load operation of the unit, due to the large changes in the temperature and pressure of the working medium in the filter, the filter flange is affected by thermal expansion and contraction, and the filter flange fastening bolts cannot meet the required fastening requirements of the filter, resulting in steam floating and dripping on the filter, and even endangering the safe operation of the unit.

[0004] Therefore, it is urgent to propose a filter flange fastening device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a filter screen flange fastening device with high connection strength and good sealing performance, so as to improve the safety of the unit.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A filter flange fastening device, comprising:

[0008] A body flange, the body flange is installed at the inlet of the water pump, a filter is provided on the body flange, and a groove is provided on the side of the body flange facing away from the water pump;

[0009] A blind flange is connected to the body flange by bolts, and a convex portion is provided on one side of the blind flange close to the body flange, and the convex portion can be inserted into the groove.

[0010] As an optional technical solution for the filter flange fastening device, a circular boss with the center of the body flange as the center is provided on the side of the body flange facing away from the water pump, and the groove is located on the circular boss.

[0011] As an optional technical solution for the filter flange fastening device, the bolts are fine thread bolts.

[0012] As an optional technical solution for the filter flange fastening device, the thermal expansion range of the fine thread bolts is 0.02mm-0.06mm.

[0013] As an optional technical solution for the filter flange fastening device, the thread spacing of the fine thread bolts is 1.5mm-2mm.

[0014] As an optional technical solution for the filter flange fastening device, the depth range of the protrusion and the groove is 4mm-10mm.

[0015] As an optional technical solution for the filter flange fastening device, the protrusion and the groove are both square, and the width of the protrusion and the groove ranges from 20 mm to 45 mm.

[0016] As an optional technical solution for the filter flange fastening device, the filter flange fastening device also includes a disc spring gasket, and the bolts are sequentially penetrated and connected to the disc spring gasket, the main body flange and the blind flange.

[0017] As an optional technical solution for the filter flange fastening device, the disc spring gasket is a concave structure on the side close to the main body flange, and the disc spring gasket is a convex structure away from the main body flange.

[0018] As an optional technical solution for the filter flange fastening device, a drain hole is provided on the blind flange.

[0019] Beneficial effects of the utility model: The filter flange fastening device provided by the utility model includes a main body flange and a blind flange, and the blind flange is connected to the main body flange by bolts. A filter is provided on the main body flange, and a groove is provided on the side of the main body flange facing away from the water pump, and a convex portion is provided on the side of the blind flange close to the main body flange, and the convex portion can be inserted into the groove. Compared with the prior art, the strength of the connection between the main body flange and the blind flange is reduced due to the thermal expansion of the bolts, so that the strength of the filter flange fastening device is reduced. The filter flange fastening device, since the groove and the convex portion are respectively provided on the main body flange and the blind flange, increases the connection strength of the main body flange and the blind flange, thereby increasing the strength of the filter flange fastening device, and having good sealing performance, prevents the filter from floating and dripping, and makes the unit safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of the filter flange fastening device provided by an embodiment of the utility model;

[0021] Figure 2 It is a front view of the filter flange fastening device provided by an embodiment of the utility model;

[0022] Figure 3 is a cross-sectional view of a filter flange fastening device provided by an embodiment of the utility model;

[0023] Figure 4 It is a top view of the body flange in the filter flange fastening device provided by an embodiment of the utility model;

[0024] Figure 5 It is a cross-sectional view of a body flange in a filter flange fastening device provided by an embodiment of the utility model;

[0025] Figure 6 yes Figure 5 A magnified view at point A;

[0026] Figure 7 It is a top view of a blind flange in a filter flange fastening device provided by an embodiment of the utility model;

[0027] Figure 8 It is a cross-sectional view of a blind flange in a filter flange fastening device provided by an embodiment of the utility model;

[0028] Fig. 9 yes Figure 8 Enlarged view at B.

[0029] In the figure:

[0030] 100, body flange; 101, groove; 200, blind flange; 210, convex part; 300, bolt; 400, disc spring gasket. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The filter flange fastening device provided in this embodiment has high connection strength and good sealing performance, thereby improving the safety of the unit.

[0036] Specific as Figures 1 to 9 As shown, the filter flange fastening device includes a body flange 100 and a blind flange 200. The body flange 100 is installed at the inlet of the water pump, a filter is provided on the body flange 100, and a groove 101 is provided on the side of the body flange 100 facing away from the water pump. The blind flange 200 is connected to the body flange 100 by bolts 300, and a convex portion 210 is provided on the side of the blind flange 200 close to the body flange 100, and the convex portion 210 can be plugged into the groove 101.

[0037] Compared with the prior art, the bolt 300 expands due to heat, which reduces the strength of the connection between the main flange 100 and the blind flange 200, and reduces the strength of the filter flange fastening device. The filter flange fastening device, because the groove 101 and the convex part 210 are respectively provided on the main flange 100 and the blind flange 200, increases the connection strength of the main flange 100 and the blind flange 200, thereby increasing the strength of the filter flange fastening device, preventing the filter from floating and dripping, and making the unit safer. Furthermore, the depth range of the convex part 210 and the groove 101 is 4mm-10mm. For example, it can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0038] In this embodiment, the protrusion 210 and the groove 101 are both square, and the width of the protrusion 210 and the groove 101 ranges from 20 mm to 45 mm.

[0039] Of course, the depth and width of the protrusion 210 correspond to the depth and width of the groove 101 , respectively, so as to facilitate the assembly of the protrusion 210 and the groove 101 .

[0040] Continue to see Figures 4 to 6 The body flange 100 is provided with a circular boss with the center of the body flange 100 as the center of the circle on the side facing away from the water pump, and the groove 101 is located on the circular boss. The circular boss can further increase the connection strength between the body flange 100 and the blind flange 200, and can also increase the sealing performance between the body flange 100 and the blind flange 200.

[0041] In this embodiment, in order to increase the connection strength between the main flange 100 and the blind flange 200, the bolt 300 used is a fine-thread bolt. The fine-thread bolt has a small thread pitch and a high thread density, which enhances the contact area between the bolt 300 and the connection between the main flange 100 and the blind flange 200, and avoids the gap generated between the main flange 100 and the blind flange 200 and the bolt 300 during thermal expansion and contraction.

[0042] Optionally, the pitch of the thread bolt is 1.5mm-2mm. Exemplarily, it can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, etc. It should be noted that the thread bolt has high strength and can reduce the amount of thermal expansion generated when the bolt 300 is subjected to heat. When the thermal expansion of the body flange 100 and the blind flange 200 remains unchanged, the thermal expansion of the bolt 300 is reduced, so that the bolt 300 has a greater tightening effect on the body flange 100 and the blind flange 200.

[0043] Optionally, the strength grade of the fine thread bolt may be 8.8, 10.8 or 12.9.

[0044] In order to further increase the strength of the filter flange fastening device, the filter flange fastening device also includes a disc spring gasket 400, and the bolt 300 is sequentially inserted through the disc spring gasket 400, the body flange 100 and the blind flange 200. When the bolt 300 is tightened, the disc spring gasket 400 is elastically deformed, and the tightening force applied by the outside is applied to the body flange 100 through the elastic force of the disc spring gasket 400, so that the bolt 300 tightens the body flange 100. The disc spring gasket 400 can offset the thermal expansion difference generated by the bolt 300 and the body flange 100 during the thermal expansion and contraction process, thereby achieving the stability of the tightening force of the body flange 100 during the peak load regulation of the unit, thereby eliminating the problems of floating steam and dripping of the filter in this process.

[0045] In order to further enhance the fastening and sealing effect of the disc spring gasket 400 , the side of the disc spring gasket 400 close to the main body flange 100 is a concave structure, and the side of the disc spring gasket 400 away from the main body flange 100 is a convex structure.

[0046] The radial dimension of the disc spring gasket 400 can be adjusted according to the radial dimension of the convex structure and the concave structure. Selecting a disc spring gasket 400 with a smaller radial dimension can make the disc spring gasket 400 obtain a greater preload force. Coupled with the use of high-strength fine thread bolts, the body flange 100 can still play a good sealing role even if it is affected by thermal expansion and contraction in actual work. The thickness of the disc spring gasket 400 is also adjusted according to the height of the convex structure and the concave structure. A thicker disc spring gasket 400 can make the sealing surface obtain a more sufficient compression amount, so that the contact surface between the disc spring gasket 400 and the body flange 100 is more evenly stressed.

[0047] The blind flange 200 of the filter flange fastening device is provided with a sewage outlet for sewage discharge.

[0048] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A filter flange fastening device, characterized in that: include: A body flange (100), the body flange (100) being installed at the inlet of a water supply pump, the body flange (100) being provided with a filter screen, and a groove (101) being provided on a side of the body flange (100) facing away from the water supply pump; A blind flange (200), wherein the blind flange (200) is connected to the body flange (100) via bolts (300), and a convex portion (210) is provided on a side of the blind flange (200) close to the body flange (100), and the convex portion (210) can be inserted into the groove (101).

2. The filter flange fastening device according to claim 1, characterized in that: A circular boss with the center of the body flange (100) as the center of the circle is provided on the side of the body flange (100) facing away from the water supply pump, and the groove (101) is located on the circular boss.

3. The filter flange fastening device according to claim 1, characterized in that: The bolt (300) is a fine thread bolt.

4. The filter flange fastening device according to claim 3, characterized in that: The thermal expansion range of the fine thread bolt is 0.02mm-0.06mm.

5. The filter flange fastening device according to claim 3, characterized in that: The thread spacing of the fine thread bolt is 1.5mm-2mm.

6. The filter flange fastening device according to claim 1, characterized in that: The depths of the protrusion (210) and the groove (101) are both in the range of 4 mm to 10 mm.

7. The filter flange fastening device according to claim 1, characterized in that: The convex portion (210) and the concave portion (101) are both square in shape, and the width of the convex portion (210) and the concave portion (101) is in the range of 20 mm to 45 mm.

8. The filter flange fastening device according to claim 1, characterized in that: The filter flange fastening device also includes a disc spring gasket (400), and the bolt (300) is sequentially inserted through and connected to the disc spring gasket (400), the body flange (100) and the blind flange (200).

9. The filter flange fastening device according to claim 8, characterized in that: The side of the disc spring gasket (400) close to the main body flange (100) is a concave structure, and the side of the disc spring gasket (400) away from the main body flange (100) is a convex structure.

10. The filter flange fastening device according to claim 1, characterized in that: The blind flange (200) is provided with a drain hole.

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