Non-thrust telescopic device for inlet and outlet of pump body

Abstract

The utility model discloses a non-thrust telescopic device for an inlet and an outlet of a pump body. The non-thrust telescopic device comprises a first connecting part and a second connecting part which have the same structure and are connected, the first connecting part comprises a pipeline flange and a plurality of limiting lugs symmetrically arranged around the outer ring of the pipeline flange, and lug holes are formed in the centers of the limiting lugs; a plurality of parallel telescopic pipes are connected between every two opposite second connecting parts, a plurality of limiting rods are symmetrically arranged at the positions, on the outer sides of the telescopic pipes, of the edges of the second connecting parts, and the two ends of each limiting rod sequentially penetrate through lug holes in the corresponding second connecting part and lug holes in the corresponding first connecting part and then are locked through fixing nuts. The thrust-free telescopic device is mounted at the inlet and outlet of the water pump, so that on one hand, the acting force of expansion caused by heat and contraction caused by cold of the outlet of the pump body during starting, stopping and pipeline operation is relieved, and the pipeline is restrained to be not prolonged infinitely under the hydraulic action; the service life of the pump body and the pipeline is prolonged due to acting force of stress formed by vibration generated by high-speed operation of the pump body on the pipeline or inlet and outlet flanges of the water pump.

Description

Technical Field

[0001] The present application relates to the field of pump installation equipment, and in particular to a thrust-free telescopic device for a pump inlet and outlet. Background Art

[0002] Pumps are machines that transport or pressurize liquids and are widely used in construction, thermal, and water conservancy projects. During pump startup, shutdown, and operation, the impeller generates radial thrust and vertical stress. This continuous thrust causes liquid to be ejected at high speed, and the high-speed operation of the pump creates thrust and vibration on the pipes and valves connected to the pump's inlet and outlet. Therefore, design and construction specifications require appropriate compensation measures at the pump's inlet and outlet.

[0003] In recent years, with the continuous evolution of building materials, pump inlets and outlets have increasingly employed rubber joints combined with fixed brackets to reduce vibration and eliminate the axial thrust exerted by high-speed water jets on the inlet and outlet expansion joints. However, in large-scale air conditioning, water conservancy, and heating system projects, high-lift, large-diameter, high-power, and high-voltage pumps are often used to meet operational load requirements. Pump operating conditions include flow rate, head, pressure, and temperature, and pump vibration is directly proportional to these operating conditions. Furthermore, the medium transported in urban heating systems is high-temperature hot water, making the continued use of rubber materials inadequate. Consequently, stainless steel expansion joints have emerged as an alternative to rubber joints. While stainless steel expansion joints can reduce vibration, the immense thrust generated by the high-speed operation of the pump inevitably poses a risk to the pump and piping. Over time, these joints can cause problems such as pump displacement and piping deformation. Furthermore, unlimited expansion and contraction of the expansion joint can cause it to twist or even rupture, leading to leaks at the connection between the expansion joint and the flange, compromising pump operation and making maintenance difficult and demanding. Utility Model Content

[0004] The utility model provides a thrust-free telescopic device for the inlet and outlet of a pump body, the purpose of which is to reduce the damage to the pump body and pipeline caused by the huge thrust generated during the operation of the pump body by installing a telescopic device at the inlet and outlet of the pump body that can reduce vibration and overcome infinite telescopicity.

[0005] To achieve its purpose, the utility model adopts the following technical solutions:

[0006] A thrust-free telescopic device for a pump body inlet and outlet, wherein the pump body inlet and outlet are connected by a pipeline, a pipeline flange is provided on the pipeline, and a plurality of bolt holes are equidistantly provided on the pipeline flange, and the thrust-free telescopic device includes a first connecting part and a second connecting part with identical structure and connected to each other; the first connecting part and the second connecting part both include a pipeline flange and a plurality of limiting ears symmetrically arranged around the outer ring of the pipeline flange, and an ear hole is provided at the center of the limiting ear; a plurality of mutually parallel telescopic tubes are connected between the two opposite second connecting parts, and a plurality of limiting rods are symmetrically provided at the edge of the second connecting part on the outside of the telescopic tube, and the two ends of the limiting rods are respectively passed through the ear holes on the second connecting part and the first connecting part in turn and then locked by fixing nuts.

[0007] Furthermore, the first connecting part and the second connecting part are connected by bolts inserted into the bolt holes; and the connection between the limiting rod and the first connecting part and the second connecting part is locked by a fixing nut.

[0008] Furthermore, there are four limiting rods, and both ends of the limiting rods are provided with external threads that are compatible with the fixing nuts.

[0009] Furthermore, a hemispherical washer and a hemispherical nut are provided at the connection between the limiting rod and the first connecting part, and the limiting rod close to the first connecting part is locked in sequence by the hemispherical washer, the hemispherical nut and the fixing nut.

[0010] Furthermore, the length of the limiting rod is greater than the sum of the telescopic tube, the second connecting portion, the first connecting portion, the hemispherical gasket, the hemispherical nut and the fixing nut in the retracted state.

[0011] Furthermore, the number of the limiting ears is the same as the number of the limiting rods, and the limiting ears are vertically and equidistantly arranged on the outer circle of the first connecting part.

[0012] Furthermore, the center of the limiting ear is collinear with the center of the adjacent bolt hole.

[0013] Furthermore, the thickness of the limiting ear is the same as the thickness of the pipeline flange.

[0014] Furthermore, the inner diameter of the ear hole is the same as the inner diameter of the bolt hole.

[0015] Furthermore, the telescopic tube is a stainless steel bellows.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] By installing thrust-free expansion and contraction devices at the pump inlet and outlet, the forces acting on the pump outlet during startup, shutdown, and pipeline operation are mitigated, preventing the pipeline from extending indefinitely under hydraulic pressure. Furthermore, external forces, such as the stress caused by vibration generated by high-speed pump operation, acting on the pipeline or pump inlet and outlet flanges, are buffered, extending the service life of the pump and pipeline. Furthermore, the expansion tube is a stainless steel bellows-type tube, which absorbs and releases radial forces through its 360-degree corrugations. Under pressure, individual corrugations partially elongate and compress, forming appropriate tilting and twisting deformations to eliminate these forces and further buffer external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the thrust-free telescopic device of the utility model;

[0019] Figure 2 This is a schematic structural diagram of the first connecting portion and the second connecting portion of the present invention;

[0020] Figure 3 This is a schematic diagram of the limit rod structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the connection structure of the end portion of the limit rod of the present utility model;

[0022] In the figure: 1-first connecting part; 2-second connecting part; 3-telescopic tube; 4-limiting rod; 5-limiting ear; 6-fixing nut; 7-hemispherical gasket; 8-hemispherical nut; 9-ear hole; 10-bolt hole; 11-pipe flange; 12-bolt. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figure 1-4 As shown, the utility model is a thrust-free telescopic device for the inlet and outlet of a pump body, the inlet and outlet of the pump body are connected by a pipeline, a pipeline flange 11 is provided on the pipeline, and twelve bolt holes 10 are equidistantly provided on the pipeline flange 11, and the thrust-free telescopic device includes a first connecting part 1 and a second connecting part 2 with the same structure and connected to each other.

[0025] The first and second connecting parts 1 and 2 are connected by bolts 12 inserted into bolt holes 10. Each first and second connecting part 1 and 2 includes a pipe flange 1 and four stopper lugs 5 welded perpendicularly and equidistantly around the outer circumference of the pipe flange 1. Each stopper lug 5 has a lug hole 9 at its center. Specifically, to minimize the impact of the thrustless telescopic device on the bolts 12 on the pipe flange 1, the stopper lugs 5 are welded so that their centers are collinear with the centers of adjacent bolt holes 10, achieving offset. The thickness of each stopper lug 5 is the same as that of the pipe flange 11, and the inner diameter of the lug hole 9 is the same as that of the bolt hole 10. Multiple parallel telescopic tubes 3 are connected between the two opposing second connecting parts 2. These tubes 3 are stainless steel bellows. Four stopper rods 4 are symmetrically positioned at the outer edges of the second connecting part 2. Each end of the stopper rod 4 has external threads. The ends of the stopper rods 4 pass through the lug holes 9 on the second and first connecting parts 2, respectively, and are then secured with fixing nuts 6. To ensure a secure connection of the limit rod 4, the connection between the limit rod 4 and the second connection part 2 is locked by a fixing nut 6, and the connection between the limit rod 4 and the first connection part 1 is also provided with a hemispherical gasket 7 and a hemispherical nut 8. The limit rod 4 near the first connection part 1 is sequentially locked by the hemispherical gasket 7, the hemispherical nut 8 and the fixing nut 6 to ensure a secure connection, wherein the length of the limit rod 4 is greater than the sum of the telescopic tube 3, the second connection part 2, the first connection part 1, the hemispherical gasket 7, the hemispherical nut 8 and the fixing nut 6 in the retracted state.

[0026] During use, the first connecting part 1 is connected to the pump outlet pipe, and the second connecting part 2 is then connected to one side of the first connecting part 1 and locked with a bolt 12 inserted into a bolt hole 10. A telescopic tube 3 is connected to the side of the first connecting part 1 away from the second connecting part 2 to cushion vibrations and reduce the damage to the pump body and pipe caused by the huge thrust generated by the high-speed operation of the pump body. In addition, to prevent the telescopic tube 3 from being twisted or even broken due to unlimited expansion and contraction, four limiting rods 4 are symmetrically arranged at the edge of the second connecting part 2 on the outside of the telescopic tube 3. The ends of the limiting rods 4 are respectively inserted through the ear holes 9 on the second connecting part 2 and the first connecting part 1, and then locked with a fixing nut 6, thereby eliminating axial forces through the limiting rods 4.

[0027] After the thrust-free telescopic device of the present application is installed in the inlet and outlet pipes of the pump body, on the one hand, the force of thermal expansion and contraction of the inlet and outlet of the pump body during the start-up, stop and pipeline operation is alleviated, and the pipeline is constrained so that it does not extend indefinitely under the action of hydraulic force. On the other hand, it buffers external forces, such as the stress generated by the vibration generated by the high-speed operation of the pump body on the pipeline or the inlet and outlet flanges of the water pump, thereby extending the service life of the pump body and the pipeline.

Claims

1. A thrust-free telescopic device for a pump inlet and outlet, wherein the pump inlet and outlet are connected to a pipeline, a pipeline flange (11) is provided on the pipeline, and a plurality of bolt holes (10) are equidistantly provided on the pipeline flange (11), characterized in that: The thrust-free telescopic device comprises a first connecting portion (1) and a second connecting portion (2) having the same structure and being connected to each other; the first connecting portion (1) comprises a pipe flange (1) and a plurality of limiting ears (5) symmetrically arranged around the outer ring of the pipe flange (1), and an ear hole (9) is provided at the center of the limiting ear (5); a plurality of mutually parallel telescopic tubes (3) are connected between the two opposite second connecting portions (2), and a plurality of limiting rods (4) are symmetrically provided at the edge of the second connecting portion (2) outside the telescopic tube (3), and both ends of the limiting rods (4) respectively pass through the ear holes (9) on the second connecting portion (2) and the first connecting portion (1) in sequence and are then locked by fixing nuts (6).

2. A thrust-free telescopic device for a pump inlet and outlet according to claim 1, characterized in that: The first connecting portion (1) and the second connecting portion (2) are connected by a bolt (12) inserted into the bolt hole (10); the connection between the limiting rod (4) and the first connecting portion (1) and the second connecting portion (2) is locked by a fixing nut (6).

3. A thrust-free telescopic device for a pump inlet and outlet according to claim 2, characterized in that: There are four limiting rods (4), and both ends of the limiting rods (4) are provided with external threads that are compatible with the fixing nuts (6).

4. A thrust-free telescopic device for a pump inlet and outlet according to claim 3, characterized in that: A hemispherical washer (7) and a hemispherical nut (8) are further provided at the connection between the limiting rod (4) and the first connecting portion (1); the limiting rod (4) is locked in sequence near the first connecting portion (1) by the hemispherical washer (7), the hemispherical nut (8) and the fixing nut (6).

5. A thrust-free telescopic device for a pump inlet and outlet according to claim 4, characterized in that: The length of the limiting rod (4) is greater than the sum of the lengths of the telescopic tube (3), the second connecting portion (2), the first connecting portion (1), the hemispherical gasket (7), the hemispherical nut (8), and the fixing nut (6) in the retracted state.

6. A thrust-free telescopic device for a pump inlet and outlet according to claim 5, characterized in that: The number of the limiting ears (5) is the same as the number of the limiting rods (4), and the limiting ears (5) are vertically and equidistantly arranged on the outer ring of the first connecting portion (1).

7. A thrust-free telescopic device for a pump inlet and outlet according to claim 6, characterized in that: The center of the limiting ear (5) is collinear with the center of the adjacent bolt hole (10).

8. A thrust-free telescopic device for a pump inlet and outlet according to claim 7, characterized in that: The thickness of the limiting ear (5) is the same as the thickness of the pipeline flange (11).

9. A thrust-free telescopic device for a pump inlet and outlet according to claim 8, characterized in that: The inner diameter of the ear hole (9) is the same as the inner diameter of the bolt hole (10).

10. A thrust-free telescopic device for a pump inlet and outlet according to any one of claims 1 to 9, characterized in that: The telescopic tube (3) is a stainless steel bellows.

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