Flange connection structure for preventing potential difference corrosion of domestic water pump house

Abstract

The utility model relates to a flange connecting structure of life water pump house preventing potential difference corrosion produces including flange, the sealing surface between flange is provided with insulating gasket, and the outer ring of flange is fixedly connected with at least two fixed blocks, and the fixed block is provided with the positioning hole of axis and flange axis parallel, each positioning hole sets up on the same circle with flange coaxial, and the side surface of insulating gasket corresponds is provided with with each positioning hole one -to -one correspondence fixed rod, each fixed rod sets up on the same circle with insulating gasket coaxial, and fixed rod inserts into corresponding positioning hole, realizes insulating gasket and flange coaxial, when needing to install insulating gasket, make its fixed rod with corresponding positioning hole opposite, because positioning hole sets up on the same circle with flange coaxial, and fixed rod sets up on the same circle with insulating gasket coaxial, when fixed rod inserts into corresponding positioning hole, make its insulating gasket and flange coaxial, do not need human eye to aim at the center of insulating gasket circle and the center of flange.

Description

Technical Field

[0001] This utility model relates to a flange connection structure for domestic water pump rooms that prevents corrosion caused by potential difference. Background Technology

[0002] When different metal materials (e.g., carbon steel pipes and stainless steel pumps, copper valves, galvanized pipe fittings, etc.) or the same metal in different environments (e.g., soil, air, areas with different humidity levels) exist in a piping system, a natural potential difference (similar to the positive and negative terminals of a battery) will be generated between them. If these metal components are electrically connected through metal conductors (e.g., flanges, bolts, the pipes themselves) in a humid or electrolyte-containing environment (e.g., tap water containing trace minerals), a complete corrosion battery circuit will be formed. In order to protect the water pump from corrosion, an insulating flange kit (including insulating gaskets, insulating sleeves, and insulating washers) needs to be installed at the inlet and outlet flange connections of the water pump to cut off the corrosion current flow path and prevent electrochemical corrosion from occurring.

[0003] The existing installation process for insulating gaskets is as follows: For small-diameter flanges, adhesive is applied to both sides of the gasket and it is lightly attached to the upstream flange face. Then, the downstream flange is hoisted closer to the upstream flange. Next, the insulating sleeve and insulating gasket are installed. Finally, the upstream and downstream flanges are connected by segmented fastening bolts. However, when temporarily fixing the insulating gasket, it is necessary to visually align the center of the insulating gasket with the center of the flange. Visual judgment may result in the insulating gasket and the flange sealing surface being misaligned. When the insulating gasket and the flange sealing surface are misaligned, a local gap is formed between the two flange sealing surfaces. Furthermore, under non-uniform pressure, some areas of the insulating gasket are over-compressed while other areas are under-compressed. The resulting local gap and insufficient compression of the insulating gasket cause the medium in the pipeline to leak from the flange sealing surface and the insulating gasket. The leaked medium acts as a conductive path connecting the flange sealing surface, forming a new corrosion loop with the water pump and the humid air environment, which will affect the corrosion of the water pump. Utility Model Content

[0004] The purpose of this utility model is to provide a flange connection structure for domestic water pump rooms that prevents potential difference corrosion, thereby solving the technical problem that the insulating gasket and the flange sealing surface of the existing flange connection structure for domestic water pump rooms that prevents potential difference corrosion do not fit tightly.

[0005] The technical solution of this utility model is as follows: It includes a flange, with an insulating gasket disposed between the sealing surfaces of the flange. At least two fixing blocks are fixedly connected to the outer ring of the flange. Each fixing block has a positioning hole with an axis parallel to the flange axis. Each positioning hole is located on the same circle as the flange and coaxial with it. A fixing rod, corresponding to each positioning hole, is disposed on one side of the insulating gasket. Each fixing rod is located on the same circle as the insulating gasket and coaxial with it. The fixing rod is inserted into the corresponding positioning hole to achieve coaxiality between the insulating gasket and the flange. A spring pin mechanism is disposed inside the fixing block. The spring pin mechanism includes a spring with an axis parallel to the radial direction of the corresponding positioning hole and a positioning pin. A guide surface is provided on the side of the positioning pin facing the insulating gasket to guide the positioning pin towards the spring side. The spring pin mechanism also includes a limiting groove disposed on the fixing rod. The axis of the limiting groove is parallel to the axis of the positioning pin. When the insulating gasket is completely attached to the sealing surface of the flange, the positioning pin is inserted into the corresponding limiting groove under the action of the spring to lock the fixing rod.

[0006] The fixing block has an installation groove inside, which is composed of a horizontal groove and a vertical groove. A movable groove is provided on the vertical groove. A fixing plate is fixedly connected to the positioning pin. The spring is sleeved on the positioning pin. The two ends of the spring are respectively connected to the movable groove and the fixing plate. When the positioning pin is squeezed, it can ensure that the positioning pin moves stably and vertically upward.

[0007] One end of the positioning pin is connected to a T-shaped pull rod, which allows the operator to disengage the positioning pin from the limiting groove, enabling the replacement of the insulating gasket.

[0008] The outer ring of the insulating gasket is provided with insulating plastic to protect the insulating gasket from being wetted by the humid air in the pump room, so as to form a conductive path that corrodes the pump.

[0009] The guide surface of the positioning pin and the contact surface of the fixing rod are coated with a lubricating coating to ensure that the positioning pin can avoid the spring when it is squeezed by the fixing rod.

[0010] The transverse groove is connected to the positioning hole. When the fixing rod is inserted into the transverse groove, the positioning pin can be inserted into the limiting groove to lock the fixing rod.

[0011] The spring is a compression spring to ensure that the locating pin is firmly inserted into the limiting groove, thereby improving the stability of fixing the fixing rod.

[0012] The beneficial effects of this technical solution are as follows: When using the flange connection structure of the domestic water pump room to prevent potential difference corrosion, if an insulating gasket needs to be installed, the fixing rod should be aligned with the corresponding positioning hole. Since the positioning hole is set on the same circle as the flange and the fixing rod is set on the same circle as the insulating gasket, when the fixing rod is inserted into the corresponding positioning hole, the insulating gasket is aligned with the flange. It is not necessary to visually align the center of the insulating gasket with the center of the flange. When the fixing rod is inserted into the positioning hole, the positioning pin guide surface allows the positioning pin to move towards the spring. When the insulating gasket is attached to the flange sealing surface, the limiting groove on the fixing rod is coaxial with the positioning pin. Under the action of the spring, the positioning pin moves into the limiting groove, locking the fixing rod and fixing the insulating gasket. No glue is needed to fix the insulating gasket, avoiding gaps between the insulating gasket and the flange sealing surface caused by glue. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of the flange connection structure for preventing potential difference corrosion in a domestic water pumping station according to the present invention.

[0014] Figure 2 This is a front cross-sectional view of a specific embodiment of the flange connection structure for preventing potential difference corrosion in a domestic water pumping station according to the present invention.

[0015] Figure 3 This is a specific embodiment of the flange connection structure for preventing potential difference corrosion in a domestic water pumping station according to the present invention. Figure 2 Enlarged structural diagram at point A in the middle.

[0016] In the diagram: 1. Upstream pipe; 2. Bolt; 3. Upstream flange; 4. Limiting post; 5. Insulating gasket; 6. Downstream flange; 7. Downstream pipe; 8. Fixing rod; 9. Fixing block; 10. Fixing plate; 11. Spring; 12. Limiting groove; 13. Positioning hole; 14. Moving groove; 15. T-shaped tie rod. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0021] A specific embodiment of the flange connection structure for preventing potential difference corrosion in a domestic water pumping station according to this utility model is as follows: Figure 1-3As shown, the system includes flanges, specifically an upstream flange 3 and a downstream flange 6. The upstream flange 3 is connected to an upstream pipe 1, which in turn is connected to a water pump. The downstream flange 6 is connected to a downstream pipe 7, which in turn is connected to a conveying pipeline. An insulating gasket 5 is placed between the sealing surfaces of the upstream flange 3 and the downstream flange 6. The diameter of the insulating gasket 5 is larger than the diameter of the flange. The insulating gasket 5, the upstream flange 3, and the downstream flange 6 have coaxial threaded holes, with bolts 2 threaded onto the inner surfaces of the threaded holes. At least two fixing blocks 9 are fixedly connected to the outer ring of the upstream flange 3. The four fixing blocks 9 are symmetrically arranged on the outer ring of the upstream flange 3 and are evenly distributed along the circumference of the outer ring of the upstream flange 3. Each fixing block 9 has a positioning hole 13 with its axis parallel to the axis of the upstream flange 3. Each positioning hole 13 is located on the same circle as the upstream flange 3 and is coaxial with it. A fixing rod corresponding to each positioning hole 13 is provided on one side of the insulating gasket 5. 8. The insulating gasket 5 and the fixing rod 8 are designed as a single unit. The insulating gasket 5 and the fixing rod 8 are made of engineering plastic. Each fixing rod 8 is set on the same circle as the insulating gasket 5. The fixing rod 8 is inserted into the corresponding positioning hole 13 to realize the coaxiality of the insulating gasket 5 and the upstream flange 3. The fixing block 9 is equipped with a spring pin mechanism. The spring pin mechanism includes a spring 11 with its axis parallel to the radial direction of the corresponding positioning hole 13 and a positioning pin. The positioning pin is a limit post 4. The side of the positioning pin facing the insulating gasket 5 is provided with a guide surface to guide the positioning pin to avoid the spring 11 side. The guide surface is set with an inclination. The spring pin mechanism also includes a limit groove 12 set on the fixing rod 8. The axis of the limit groove 12 is parallel to the axis of the positioning pin. When the insulating gasket 5 is completely in contact with the sealing surface of the upstream flange 3, the positioning pin is inserted into the corresponding limit groove 12 under the action of the spring 11 to lock the fixing rod 8.

[0022] The fixing block 9 has an installation groove inside, which is composed of a horizontal groove and a vertical groove. A movable groove 14 is provided on the vertical groove. A fixing plate 10 is fixedly connected to the positioning pin. A spring 11 is sleeved on the positioning pin. The two ends of the spring 11 are connected to the movable groove 14 and the fixing plate 10 respectively. When the positioning pin is squeezed, it can ensure that the positioning pin moves stably and vertically.

[0023] One end of the positioning pin is connected to a T-shaped pull rod 15, and one end of the T-shaped pull rod 15 passes through the fixing block 9, so that the operator can disengage the positioning pin from the limiting groove 12 and replace the insulating gasket 5.

[0024] The outer ring of the insulating gasket 5 is provided with insulating plastic to protect the insulating gasket 5 from being wetted by the humid air in the pump room, so as to form a conductive path that corrodes the pump.

[0025] The guide surface of the positioning pin and the contact surface of the fixing rod 8 are coated with a lubricating coating, which is lubricating oil. When the positioning pin is pressed by the fixing rod 8, it ensures that the positioning pin can avoid the spring 11.

[0026] The horizontal groove is connected to the positioning hole 13. When the fixing rod 8 is inserted into the horizontal groove, the positioning pin can be inserted into the limiting groove 12 to lock the fixing rod 8.

[0027] Spring 11 is a compression spring to ensure that the positioning pin is stably inserted into the limiting groove 12, thereby improving the stability of fixing the fixing rod 8.

[0028] In use, when installing the insulating gasket 5, align the fixing rod 8 with the corresponding positioning hole 13. Since the positioning hole 13 is set on the same circle as the upstream flange 3, and the fixing rod 8 is set on the same circle as the insulating gasket 5, when the fixing rod 8 is inserted into the corresponding positioning hole 13, the insulating gasket 5 is made coaxial with the upstream flange 3. It is not necessary to manually align the center of the insulating gasket 5 with the center of the upstream flange 3 multiple times. When the fixing rod 8 is inserted into the positioning hole 13, due to the setting of the guide surface of the limiting post 4, the limiting post 4 can move towards the spring 11. When the insulating gasket 5 is in contact with the sealing surface of the upstream flange 3, the limiting groove 12 on the fixing rod 8 and the limiting post... 4. The coaxial line, under the action of spring 11, moves the limiting post 4 into the limiting groove 12 to lock the fixing rod 8 and fix the insulating gasket 5. The downstream flange 6 is brought close to the upstream flange 3 by the hoisting equipment, so that the bolt holes of the upstream flange 3, the insulating gasket 5 and the downstream flange 6 are aligned. Then, the insulating sleeve (fitted on the bolt to isolate the bolt shank from the contact with the flange bolt hole wall) and the insulating washer (installed below the bolt head and nut to isolate the bolt head / nut from the contact with the flange surface) are installed. Finally, the upstream flange 3 and the downstream flange 6 are connected by bolt 2. The insulating kit forms a high resistance barrier at the flange connection, thereby protecting the water pump from electrochemical corrosion.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A flange connection structure for a domestic water pumping station to prevent potential difference corrosion, comprising a flange, wherein an insulating gasket is provided between the sealing surfaces of the flange, characterized in that, The flange outer ring is fixedly connected with at least two fixing blocks. Each fixing block has a positioning hole with an axis parallel to the flange axis. These positioning holes are located on the same circle as the flange and coaxial with it. A fixing rod, corresponding to each positioning hole, is located on the side of the insulating gasket. Each fixing rod is also located on the same circle as the insulating gasket. The fixing rod is inserted into the corresponding positioning hole to achieve coaxiality between the insulating gasket and the flange. A spring pin mechanism is installed inside the fixing block. This mechanism includes a spring and a positioning pin with axes parallel to the radial direction of the corresponding positioning hole. A guide surface is provided on the side of the positioning pin facing the insulating gasket to guide the positioning pin towards the spring side. The spring pin mechanism also includes a limiting groove on the fixing rod, with its axis parallel to the axis of the positioning pin. When the insulating gasket is fully attached to the flange sealing surface, the positioning pin is inserted into the corresponding limiting groove under the action of the spring to lock the fixing rod.

2. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 1, characterized in that, The fixing block has an installation groove inside, which is composed of a horizontal groove and a vertical groove. A movable groove is provided on the vertical groove. A fixing plate is fixedly connected to the positioning pin. The spring is sleeved on the positioning pin, and the two ends of the spring are respectively connected to the movable groove and the fixing plate.

3. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 1, characterized in that, One end of the positioning pin is connected to a T-shaped tie rod.

4. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 1, characterized in that, The outer ring of the insulating pad is provided with insulating plastic.

5. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 1, characterized in that, The guide surface of the positioning pin and the contact surface of the fixing rod are coated with a lubricating coating.

6. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 2, characterized in that, The transverse groove is connected to the positioning hole.

7. The flange connection structure for preventing potential difference corrosion in domestic water pumping stations according to claim 1, characterized in that, The spring is a compression spring.

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