Vacuum degree checking device for water suction port of centrifugal pump in waterworks

Abstract

The utility model discloses a water supply plant centrifugal pump water suction opening vacuum degree checking device, and relates to the technical field of composite glass fiber cloth. The centrifugal pump comprises a centrifugal pump body, a water inlet is formed in the centrifugal pump body, the bottom end of the centrifugal pump body is fixedly connected with a base, the water inlet is fixedly connected with a water suction pipe, a checking assembly is installed on the water suction pipe, and a height adjusting assembly is connected between the base and the centrifugal pump body. The water inlet of the centrifugal pump body is detachably connected with the water suction pipe, the bottom end of the sliding barrel is arranged in the water suction pipe, negative pressure in the water suction pipe is smaller than atmospheric pressure at the arc-shaped groove, the atmospheric pressure forces the guide column to push the piston to move downwards, the pressure difference can be rapidly read, and an operator can conveniently check the vacuum degree in the air inlet; the mounting heights of the centrifugal pump body and the air suction pipe can take the horizontal height of the base as a base point, and when the nut is adjusted, the scales on the air suction pipe can be quickly measured through the sliding ring, so that an operator can use the device conveniently.

Description

Technical Field

[0001] This utility model relates to the field of composite glass fiber cloth technology, specifically a vacuum degree verification device for the suction port of a centrifugal pump in a waterworks. Background Technology

[0002] Waterworks typically use centrifugal pumps for water delivery. The front end of the centrifugal pump consists of a suction well and a suction pipe. Since most pump houses are located at relatively high elevations, a vacuum device is needed to evacuate the suction port before the centrifugal pump can operate, creating a certain vacuum value. This ensures the pump casing is filled with water before the pump can be started. Currently, only a vacuum gauge is installed at the waterworks pump suction port, and the pump start-up time is determined by the vacuum value and manual experience. Factors such as the centrifugal pump's installation height and the pressure difference between the inside and outside of the air inlet can easily affect the accuracy of the vacuum reading. To address these issues, the inventor proposes a vacuum degree verification device for the suction port of a centrifugal pump in a waterworks. Utility Model Content

[0003] To address the current issue that simply installing a vacuum gauge at the water pump inlet in water plants and relying on vacuum readings and manual experience to determine pump start-up time, the accuracy of the vacuum reading can be easily affected by factors such as the installation height of the centrifugal pump and the pressure difference between the inside and outside of the air inlet; the purpose of this utility model is to provide a vacuum degree verification device for the water pump inlet of a centrifugal pump in a water plant.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vacuum degree verification device for the suction port of a centrifugal pump in a waterworks, comprising a centrifugal pump body, an inlet provided on the centrifugal pump body, a base fixedly connected to the bottom end of the centrifugal pump body, a suction pipe fixedly connected to the inlet, a verification component installed on the suction pipe, a height adjustment component connected between the base and the centrifugal pump body, the suction pipe connected to the inlet of the centrifugal pump body, and the verification component installed on the suction pipe can verify the vacuum degree in the inlet, and the installation height of the centrifugal pump body can be quickly measured by the horizontal height of the base, which is convenient for the operator to judge the vacuum degree in the inlet.

[0005] Preferably, a base is fixedly connected to the outer surface of the bottom end of the centrifugal pump body, and a first flange is fixedly provided at one end of the water inlet. The first flange is threadedly connected to the suction pipe, which makes it easy to install the suction pipe.

[0006] Preferably, a connecting rod is fixedly provided on the side of the base, and a slip ring is fixedly connected to one end of the connecting rod. A suction pipe is slidably connected inside the slip ring. When the installation height of the centrifugal pump body and the suction pipe is adjusted, the slip ring and the suction pipe are slidably connected. The suction pipe is L-shaped and has graduations. A second flange is fixedly provided at one end of the suction pipe, and the second flange is threadedly connected to the first flange. A round hole is provided at one end of the suction pipe, and a mounting base is fixedly provided on the outer surface of one end of the suction pipe. A verification component is fixedly installed on the upper surface of the mounting base. The scale on the suction pipe is read from the upper end face of the slip ring, thus quickly determining the installation height of the centrifugal pump body. The calibration component includes a vacuum dial, with a slide cylinder fixedly fitted to the bottom of the vacuum dial. The slide cylinder is fixedly fitted into a circular hole, and a piston slides inside the slide cylinder. An arc-shaped groove is formed on the outer surface of the slide cylinder, and a guide post is fixedly connected to the upper end of the piston. The upper end of the guide post is slidably connected to the vacuum dial, and a spring is fitted on the outer surface of the guide post. The bottom end of the slide cylinder is located inside the suction pipe. The negative pressure inside the suction pipe is less than the atmospheric pressure at the arc-shaped groove, causing the guide post to push the piston downward. The piston moves, causing the spring to deform, and its stroke always keeps the slide and suction pipe in a blocked state. The height adjustment assembly includes four studs, which are fixed to the upper surface of the base. Each stud is threaded with two nuts, which are located on the upper and lower surfaces of the base. The base is at the horizontal plane of the base point. By adjusting the two nuts, the centrifugal pump body moves up and down along the studs, thereby adjusting the installation height of the centrifugal pump body. This adjusts the installation height of the pump shaft, the liquid level in the suction well, the actual atmospheric pressure at the centrifugal pump body, and the water level. By using indicators such as temperature, the maximum allowable vacuum height value of the centrifugal pump body before starting the pump is determined. The vacuum degree in the inlet is strictly controlled within this range, which not only ensures precise control of the centrifugal pump body during startup, but also avoids damage to the centrifugal pump body due to excessive NPSH, ultimately improving the working efficiency of the centrifugal pump body. In actual conditions, the vacuum height value in the inlet of the centrifugal pump body = (atmospheric pressure at the installation location of the centrifugal pump body - saturated steam pressure at the installation location of the centrifugal pump body) + flow velocity in the inlet * flow velocity at the suction inlet of the centrifugal pump body / 2g - required NPSH of the centrifugal pump body.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0008] 1. The inlet of the centrifugal pump body is detachably connected to the suction pipe. The bottom of the slide is located inside the suction pipe. The negative pressure inside the suction pipe is less than the atmospheric pressure at the arc groove. The atmospheric pressure forces the guide column to push the piston down, which can quickly read the pressure difference and facilitate the operator to check the vacuum degree inside the air inlet.

[0009] 2. The installation height of the centrifugal pump body and suction pipe can be based on the horizontal height of the base. When adjusting the nut, the scale on the suction pipe can be quickly measured through the slip ring, which is convenient for the operator to use. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the height adjustment component of this utility model.

[0013] Figure 3 This is a schematic diagram of the water suction pipe structure of this utility model.

[0014] Figure 4 This is a schematic diagram of the structural verification component of this utility model.

[0015] In the diagram: 1. Centrifugal pump body; 11. Inlet; 12. First flange; 13. Base; 2. Base; 21. Connecting rod; 22. Slip ring; 3. Height adjustment assembly; 31. Stud; 32. Nut; 4. Suction pipe; 41. Scale; 42. Round hole; 43. Second flange; 44. Mounting seat; 5. Verification assembly; 51. Vacuum dial; 52. Slide cylinder; 521. Arc groove; 53. Piston; 54. Guide column; 55. Spring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1-4 As shown, this utility model provides a vacuum degree verification device for the suction port of a centrifugal pump in a waterworks, including a centrifugal pump body 1, an inlet 11 provided on the centrifugal pump body 1, a base 2 fixedly connected to the bottom end of the centrifugal pump body 1, a suction pipe 4 fixedly connected to the inlet 11, a verification component 5 installed on the suction pipe 4, and a height adjustment component 3 connected between the base 2 and the centrifugal pump body 1.

[0018] By adopting the above technical solution, the inlet 11 of the centrifugal pump body 1 is connected to the suction pipe 4, and the suction pipe 4 is equipped with a verification component 5 to verify the vacuum degree in the inlet 11. The installation height of the centrifugal pump body 1 can be quickly measured by the horizontal height of the base 2, which makes it easy for the operator to judge the vacuum degree in the inlet 11.

[0019] A base 13 is fixedly connected to the outer surface of the bottom end of the centrifugal pump body 1, and a first flange 12 is fixedly provided at one end of the water inlet 11. The first flange 12 is threadedly connected to the suction pipe 4.

[0020] By adopting the above technical solution, the first flange 12 is threadedly connected to the suction pipe 4, making the suction pipe 4 easy to install.

[0021] A connecting rod 21 is fixedly provided on the side of the base 2. A slip ring 22 is fixedly connected to one end of the connecting rod 21. A water suction pipe 4 is slidably connected inside the slip ring 22.

[0022] By adopting the above technical solution, when the installation height of the centrifugal pump body 1 and the suction pipe 4 is adjusted, the slip ring 22 is slidably connected to the suction pipe 4.

[0023] The water suction pipe 4 is L-shaped and has a scale 41. A second flange 43 is fixedly provided at one end of the water suction pipe 4. The second flange 43 is threadedly connected to the first flange 12. A round hole 42 is provided at one end of the water suction pipe 4. A mounting base 44 is fixedly provided on the outer surface of one end of the water suction pipe 4. A verification component 5 is fixedly installed on the upper surface of the mounting base 44.

[0024] By adopting the above technical solution, the scale 41 on the suction pipe 4 can be read from the upper end face of the slip ring 22, thereby quickly reading the installation height of the centrifugal pump body 1.

[0025] The verification component 5 includes a vacuum dial 51, a slide cylinder 52 fixedly sleeved at the bottom of the vacuum dial 51, the slide cylinder 52 fixedly sleeved in the circular hole 42, a piston 53 slidably disposed inside the slide cylinder 52, an arc groove 521 opened on the outer surface of the slide cylinder 52, a guide post 54 fixedly connected to the upper end of the piston 53, the upper end of the guide post 54 slidably connected to the vacuum dial 51, and a spring 55 sleeved on the outer surface of the guide post 54.

[0026] By adopting the above technical solution, the bottom end of the slide cylinder 52 is located inside the water suction pipe 4. The negative pressure inside the water suction pipe 4 is less than the atmospheric pressure at the arc groove 521, which causes the guide column 54 to push the piston 53 down and deform the spring 55. The movement stroke of the piston 53 always keeps the slide cylinder 52 and the water suction pipe 4 in a blocked state.

[0027] The height adjustment component 3 includes four studs 31, which are fixedly mounted on the upper surface of the base 2. Each stud 31 is threaded with two nuts 32, which are located on the upper and lower surfaces of the base 13.

[0028] By adopting the above technical solution, the base 2 is positioned on the horizontal plane of the base point. By adjusting the two nuts 32, the centrifugal pump body 1 is moved up and down along the stud 31, thereby adjusting the installation height of the centrifugal pump body 1. By introducing the installation position height of the pump shaft of the centrifugal pump body 1, the liquid level height of the suction well, the actual atmospheric pressure value of the centrifugal pump body 1 at the site, the water temperature, and other indicators, the maximum allowable vacuum height value before starting the centrifugal pump body 1 is determined. The vacuum degree in the inlet 11 is strictly controlled within this range, which not only achieves precise control of the centrifugal pump body 1 starting, but also avoids damage to the centrifugal pump body 1 due to excessive NPSH, ultimately improving the working efficiency of the centrifugal pump body 1. In actual conditions, the vacuum height value in the inlet 11 of the centrifugal pump body 1 = (atmospheric pressure at the installation location of the centrifugal pump body 1 - saturated vapor pressure at the installation location of the centrifugal pump body 1) + flow velocity in the inlet 11 * flow velocity at the suction inlet of the centrifugal pump body 1 / 2g - required NPSH of the centrifugal pump body 1.

[0029] Working principle: The inlet 11 of the centrifugal pump body 1 is fixedly installed with the suction pipe 4 by means of threaded connection. The suction pipe 4 is equipped with a verification component 5, which can verify the vacuum degree in the inlet 11. The verification component 5 includes a vacuum dial 51, and the slide cylinder 52 at the bottom of the vacuum dial 51 is fixed in the suction pipe 4. The negative pressure in the suction pipe 4 is less than the atmospheric pressure at the arc groove 521. The external air pressure causes the guide column 54 to push the piston 53 down and deform the spring 55, so that the pressure difference can be quickly read through the vacuum dial 51. The installation height of the centrifugal pump body 1 can be adjusted by adjusting the nut 32 so that the horizontal height of the base 2 is used as the reference point, and the scale 41 on the suction pipe 4 can be quickly measured by the slip ring 22, which makes it easy for the operator to judge the vacuum degree in the inlet 11.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A device for verifying the vacuum degree of a centrifugal pump suction inlet in a waterworks, comprising a centrifugal pump body (1), characterized in that: The centrifugal pump body (1) is provided with an inlet (11), a base (2) is fixedly connected to the bottom end of the centrifugal pump body (1), a suction pipe (4) is fixedly connected to the inlet (11), a verification component (5) is installed on the suction pipe (4), and a height adjustment component (3) is connected between the base (2) and the centrifugal pump body (1). The verification component (5) includes a vacuum dial (51), a slide cylinder (52) is fixedly sleeved at the bottom of the vacuum dial (51), the slide cylinder (52) is fixedly sleeved in the round hole (42), a piston (53) is slidably provided in the slide cylinder (52), an arc groove (521) is opened on the outer surface of the slide cylinder (52), a guide post (54) is fixedly connected to the upper end of the piston (53), the upper end of the guide post (54) is slidably connected to the vacuum dial (51), and a spring (55) is sleeved on the outer surface of the guide post (54).

2. A device for checking the vacuum degree of a suction port of a centrifugal pump of a waterworks according to claim 1, wherein The centrifugal pump body (1) has a base (13) fixedly connected to the outer surface of the bottom end, and a first flange (12) is fixedly provided at one end of the water inlet (11). The first flange (12) is threadedly connected to the suction pipe (4).

3. A device for checking the vacuum degree of a suction port of a centrifugal pump of a waterworks according to claim 1, wherein A connecting rod (21) is fixedly provided on the side of the base (2), and a slip ring (22) is fixedly connected to one end of the connecting rod (21). A water suction pipe (4) is slidably connected inside the slip ring (22).

4. A device for checking the vacuum degree of a suction port of a centrifugal pump of a waterworks according to claim 3, wherein The water suction pipe (4) is L-shaped and has a scale (41) on it. A second flange (43) is fixedly provided at one end of the water suction pipe (4). The second flange (43) is threadedly connected to the first flange (12). A round hole (42) is provided at one end of the water suction pipe (4). A mounting base (44) is fixedly provided on the outer surface of one end of the water suction pipe (4). A verification component (5) is fixedly installed on the upper surface of the mounting base (44).

5. The device for checking the vacuum degree of the suction port of a centrifugal pump in a waterworks according to claim 1, wherein The height adjustment component (3) includes four studs (31), which are fixed on the upper surface of the base (2). Each stud (31) is threaded with two nuts (32), which are located on the upper and lower surfaces of the base (13).

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