An erosion resistant pump

Abstract

The utility model relates to a kind of corrosion resistant pump, belong to centrifugal pump technical field.The corrosion resistant pump includes front part pressurizing volute and rear volute, front part pressurizing volute includes pressure line, throat pipe, diffusion pipe and discharge pipe connected in turn, pressure line is vertically arranged, throat pipe and diffusion pipe jointly constitute Archimedes spiral line pipe, discharge pipe includes elbow and horizontal straight pipe, discharge pipe is communicated with the inlet of rear volute, the inside of pressure line is provided with nozzle, nozzle is communicated with the outlet of rear volute by reflux pipe, corrosion resistant pump further includes impeller, pump cover and suspension, pump cover and rear volute form a complete cavity, impeller is installed in cavity, and impeller is connected with the pump shaft of suspension.The corrosion resistant pump is small in pump body volume, saves space, can promote impeller inlet pressure, prevent medium from vaporizing in the process of suction due to pump inlet pressure being negative pressure, cause pump to produce cavitation, reduce the service life of pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal pumps, in particular to a corrosion-resistant pump. BACKGROUND

[0002] In the production process of industrial enterprises in papermaking, chemical industry, food, pharmaceutical, grain and oil processing, rubber, cotton spinning, printing and dyeing, woodworking and other industries, high-temperature steam is often used or generated. High-temperature condensate is generated during steam transportation and steam use. These condensate has 20% to 30% of the heat of steam, is excellent softened water, and has high recycling value. The recovery of condensate not only reduces the consumption of fuel and the corresponding cost, but also reduces the consumption of tap water and the corresponding water fee and water treatment cost. The recovery of condensate and the use of its heat are one of the effective ways for industrial enterprises to save energy and reduce consumption. Condensate pressurization recovery systems are divided into two types according to different pressurization devices: one is to use an electric pump as a condensate pressurization pump; the other is to use a power mechanical pump as a condensate pressurization pump. These two methods are the more popular condensate recovery methods at home and abroad. When the electric pump extracts high-temperature condensate from the water tank, the inlet forms a negative pressure due to the operation of the electric pump, and the pressure reduction causes the high-temperature condensate to vaporize and form secondary steam, which causes the electric pump to cavitate, seriously affecting the service life of the pump impeller and the pump body. To prevent the secondary vaporization of high-temperature condensate, the existing technology often raises the water tank to reverse the pump, so that the pump inlet has a certain pre-pressure to prevent vaporization at the pump inlet. However, the height of the tank is limited, and the inlet pressure can ensure normal operation of the pump when the pump is started. As the liquid level in the tank continues to drop, the pump inlet pressure quickly drops below the vaporization pressure of the medium, making the pump unable to work normally. The use of ordinary jet pumps to raise the inlet pressure produces a lot of noise, which cannot meet the requirements of users in high-noise environments. SUMMARY

[0003] In order to solve the technical problems existing in the prior art, the present application provides a corrosion-resistant pump for easily vaporized medium, which has a small pump body volume, saves space, can raise the inlet pressure of the impeller without noise, and can prevent the vaporization of the medium during suction due to negative pressure at the pump inlet, thereby reducing the service life of the pump.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] A corrosion-resistant pump comprises a front pressurization volute and a rear volute.

[0006] The front pressurizing volute comprises a pressure pipeline, a throat pipe, a diffusion pipe and a discharge pipe connected in sequence, the pressure pipeline is vertically arranged, the throat pipe and the diffusion pipe jointly form an Archimedes spiral pipe, the discharge pipe comprises a right-angle elbow pipe and a straight pipe arranged horizontally, and the discharge pipe is communicated with the inlet of the rear volute; a nozzle is arranged in the pressure pipeline, and the nozzle is communicated with the outlet of the rear volute through a return pipe.

[0007] The anti-corrosion pump further comprises an impeller, a pump cover and a suspension, the pump cover and the rear volute form a complete cavity, the cavity is internally provided with the impeller, and the impeller is connected with the pump shaft of the suspension.

[0008] Further, the flow channel axis of the pressure pipeline is perpendicularly intersected with the flow channel axis of the throat pipe and the diffusion pipe at the tangent point of the perpendicular line and the Archimedes spiral.

[0009] Further, the starting point of the flow channel axis of the throat pipe and the diffusion pipe is any point on the circumference of the rear volute inlet concentric circle, and the diameter of the rear volute inlet concentric circle is greater than or equal to the diameter of the rear volute inlet.

[0010] Further, the nozzle is fixedly arranged in the pressure pipeline through a connecting rib or a connecting plate.

[0011] Further, the specific arrangement mode that the nozzle is communicated with the outlet of the rear volute through the return pipe is that the nozzle is directly connected with the outlet of the rear volute through the return pipe; or the outlet of the rear volute is provided with an outlet tee joint, the inlet of the nozzle is provided with a flange, the return pipe is provided with flanges at both ends, and the return pipe is connected with the flange of the nozzle inlet and the flange of the outlet tee joint through the flanges at both ends; or the outlet of the rear volute is provided with a return flange, the suction inlet of the nozzle is provided with a flange, the return pipe is provided with flanges at both ends, and the return pipe is connected with the flange of the nozzle inlet and the return flange through the flanges at both ends.

[0012] Further, the front pressurizing volute is a spiral Venturi tube.

[0013] Further, the rear volute adopts a centrifugal pump body.

[0014] The beneficial effects of the present application are as follows:

[0015] (1) The front pressurizing volute replaces the high-level water storage tank, the anti-corrosion pump is pressurized through the front pressurizing volute, and water is pumped through the rear volute, the front pressurizing volute and the rear volute are integrated, the occupied space is small, the structure is simpler, the equipment connecting pipe is not needed, the cost is saved, the performance is reliable, and the problem that the space area is relatively small and large pressurizing equipment cannot be placed on site is solved.

[0016] (2) the flow channel axis of the front pressurizing volute is composed of a vertical line, an Archimedes spiral, an arc line and a horizontal line in turn and connected end to end, the Archimedes spiral is also called "constant speed spiral", when a point P moves along the ray OP at a constant speed, the ray also rotates around the point O at a constant angular velocity, compared with other curves, the spiral is the locus of a point moving at a constant speed v on a ray rotating around the pole at a constant angular velocity ω, the ray through the pole is divided into segments of equal length by the curve, and the same angular velocity ensures that the fluid flow rate does not increase additional speed when the flow channel axis is a circle, so as to change the fluid motion state and parameters, and ensure the stability of the equipment;

[0017] (3) the flow channel axis of the pressure pipeline intersects with the flow channel axes of the throat pipe and the diffusion pipe perpendicularly at the tangent point of the vertical line and the Archimedes spiral, which can ensure that there is no inflection point when the liquid flow changes from linear motion to circular motion, so that the medium can smoothly enter the rotational flow state, and at the same time, the transition into the rotational flow state can ensure small along-the-way loss, that is, the inner wall curve of the volute is connected smoothly without inflection points, and the curvature center is on the same side, so that the along-the-way loss of energy is small, and the efficiency of the front pressurizing volute can be ensured to be the highest;

[0018] (4) when the front pressurizing volute and the rear volute are in a split type, casting is simple, and the sizes of various parts of the front pressurizing volute can be adjusted according to the parameters of the corrosion-resistant pump, so that the design scheme can be conveniently changed;

[0019] (5) when the front pressurizing volute and the rear volute are in an integral type, the volume is smaller, and the length is also greatly reduced compared with the split type, since the front pressurizing volute and the rear volute are cast at one time, cannot be connected by flanges, and are simple to assemble, and have no leakage points;

[0020] (6) the corrosion-resistant pump of the present application is suitable for the transportation of all kinds of easily vaporized media such as high-temperature condensed water in the petroleum, petrochemical, papermaking and other industries.

[0021] (7) the entire flow channel is a smooth curve, which can reduce the liquid flow rate during the flow of the medium, so that the speed can be converted into pressure energy, and the noise generated during the flow of the liquid is reduced due to the slow flow rate.

[0022] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of a corrosion-resistant pump provided by embodiment one of the present application;

[0024] Figure 2 is a side view of a corrosion-resistant pump provided by embodiment one of the present application;

[0025] Figure 3 is a side view of a corrosion-resistant pump provided by embodiment two of the present application;

[0026] Figure 4 is a side view of an erosion-resistant pump provided by Embodiment Three of the present application;

[0027] Figure 5 is a schematic view of the flow channel axis of the front pressurized volute provided by the present application;

[0028] Figure 6 is a schematic view of the flow channel axis of the front pressurized volute provided by the present application.

[0029] The reference signs in the drawings of the specification include:

[0030] 1, front pressurized volute, 2, rear volute, 3, return pipe, 4, nozzle, 5, pressure pipeline, 6, throat pipe, 7, diffuser pipe, 8, discharge pipe, 9, impeller, 10, pump cover, 11, suspension, 12, pump shaft, 13, base, 14, flow channel axis of the pressure pipeline, 15, flow channel axis of the throat pipe and diffuser pipe, 16, outlet tee, 17, return flange, 18, rear volute inlet concentric circle. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0032] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present application, unless otherwise specified and limited, it should be noted that the terms "mounting", "connection" and "connection" should be understood broadly, for example, they can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, or indirect connection through an intermediate medium, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0034] Embodiment One

[0035] As shown in Figures 1 to 2 , the present application provides an erosion-resistant pump, which comprises a front pressurized volute 1 and a rear volute 2, and the front pressurized volute 1 and the rear volute 2 are integrated;

[0036] The front pressurizing volute 1 comprises a pressure pipeline 5, a throat pipe 6, a diffusion pipe 7 and a discharge pipe 8 connected in sequence, the pressure pipeline 5 is vertically arranged, the throat pipe 6 and the diffusion pipe 7 jointly form an Archimedes spiral pipe, the discharge pipe 8 comprises a right-angle elbow pipe and a straight pipe arranged horizontally, and the discharge pipe 8 is communicated with the inlet of the rear volute 2; the inside of the pressure pipeline 5 is provided with a nozzle 4, and the nozzle 4 is communicated with the outlet of the rear volute 2 through a return pipe 3.

[0037] The anti-erosion pump further comprises an impeller 9, a pump cover 10 and a suspension 11, the pump cover 10 and the rear volute 2 jointly form a complete cavity, the cavity is provided with the impeller 9, and the impeller 9 is connected with a pump shaft 12 of the suspension 11.

[0038] In the embodiment, the front pressurizing volute 1 is a spiral Venturi tube, and the rear volute 2 adopts a centrifugal pump body. The front pressurizing volute 1 is provided with a connecting flange at the inlet of the pressure pipeline 5; the rear volute 2 adopts an existing centrifugal pump body, the impeller 9, the pump cover 10 and the pump shaft 12 also adopt the structure of the existing centrifugal pump, the rear volute 2 and the pump cover 10 jointly form a complete centrifugal pump cavity, the impeller 9 installed in the cavity is driven by the pump shaft 12 in the suspension 11 to discharge the medium sucked from the inlet of the front pressurizing volute 1 from the outlet of the rear volute 2, and the medium discharged from the rear volute 2 directly flows to the next process, and part of the medium enters the nozzle 4 through the return pipe 3 to provide power for the pressurizing volute 1.

[0039] As shown in Figure 5 and Figure 6 , the flow channel axis 14 of the pressure pipeline and the flow channel axis 15 of the throat pipe and the diffusion pipe are perpendicularly intersected at the tangent point of the perpendicular line and the Archimedes spiral. In the application, the flow channel axes of the pressure pipeline 5, the throat pipe 6, the diffusion pipe 7 and the discharge pipe 8 are composed of the perpendicular line, the Archimedes spiral, the arc line and the horizontal line connected in sequence, specifically, the form of the flow channel axis 14 of the pressure pipeline is the perpendicular line; the form of the flow channel axis 15 of the throat pipe and the diffusion pipe is the Archimedes spiral, the perpendicular line and the Archimedes spiral are perpendicularly intersected at the tangent point A of the perpendicular line and the Archimedes spiral, so as to ensure that there is no inflection point when the liquid flow changes from the linear motion to the circular motion, and the medium can smoothly enter the rotational flow state while ensuring that the transition into the rotational flow state has small along-way loss, that is, the inner wall curve of the volute is connected smoothly without inflection point, and the curvature center is on the same side, so that the along-way loss energy is small, and the efficiency of the front pressurizing volute can be ensured to be the highest; the form of the flow channel axis of the discharge pipe 8 is the arc line and the horizontal line connected in sequence.

[0040] As shown in Figure 5 and Figure 6As shown, the starting point of the flow channel axis 15 of the throat and diffuser is any point on the circumference of the concentric circle 18 at the rear volute inlet. The diameter of the concentric circle 18 at the rear volute inlet is greater than or equal to the diameter of the rear volute 2 inlet. When the diameter of the concentric circle 18 at the rear volute inlet is greater than the diameter of the rear volute 2 inlet, the discharge pipe 8 is composed of a straight pipe, a 90° bend, and a straight pipe connected in sequence. When the diameter of the concentric circle 18 at the rear volute inlet is equal to the diameter of the rear volute 2 inlet, the discharge pipe 8 is composed of a 90° bend and a straight pipe connected together. The straight pipe of the discharge pipe 8 is connected to the inlet of the rear volute 2 to connect the two parallel volute flow channels into one unit. The concentric circle 18 at the rear volute inlet is the base circle of the Archimedean spiral. In actual use, the lowest point of the Archimedean spiral is not lower than the height H from the center line of the rear volute 2 inlet to the bottom surface of the pump base 13 to ensure that the front pressurizing volute 1 does not interfere with the ground, thus preventing assembly.

[0041] The nozzle 4 is fixed inside the pressure pipeline 5 by a connecting rib or a connecting plate. In this embodiment, the nozzle 4 and the outlet of the rear volute 2 are connected by a return pipe 3 in the following specific arrangement: the nozzle 4 and the outlet of the rear volute 2 are directly connected by a return pipe 3.

[0042] Example 2

[0043] like Figure 3 As shown, in this embodiment, the front pressurized volute 1 and the rear volute 2 are separate units. The specific arrangement of the nozzle 4 and the outlet of the rear volute 2 being connected through the return pipe 3 is as follows: the outlet of the rear volute 2 is provided with an outlet tee 16, the inlet of the nozzle 4 is provided with a flange, and both ends of the return pipe 3 are provided with flanges. The return pipe 3 is connected to the inlet flange of the nozzle 4 and the flange of the outlet tee 16 through the flanges at both ends of the return pipe 3, respectively.

[0044] All other structures and settings in this embodiment are the same as in Embodiment 1.

[0045] Example 3

[0046] like Figure 4 As shown, in this embodiment, the front pressurized volute 1 and the rear volute 2 are separate units. The outlet of the rear volute 2 is provided with a return flange 17, the inlet of the nozzle 4 is provided with a flange, and both ends of the return pipe 3 are provided with flanges. The return pipe 3 is connected to the inlet flange of the nozzle 4 and the return flange 17 through the flanges at both ends of its ends, respectively.

[0047] All other structures and settings in this embodiment are the same as in Embodiment 1.

[0048] The working process of a corrosion-inhibiting pump according to the present invention:

[0049] Before starting the pump, open the external water source switch to fill the pump with water to discharge the gas in the pump; after starting the pump, the impeller 9 installed in the rear volute 2 is driven by the pump shaft 12 in the suspension 11 to discharge the medium sucked from the inlet of the front pressurizing volute 1 from the outlet of the rear volute 2, and the medium discharged from the rear volute 2 directly flows to the next flow process; another part of the medium enters the nozzle 4 through the return pipe 3 to provide power for the front pressurizing volute 1, pressurize the medium sucked from the inlet of the front pressurizing volute 1, and enter the rear volute 2 after being pressurized, so as to prevent the medium from directly entering the rear volute 2 to form negative pressure at the inlet of the rear volute 2, make the high-temperature condensed water vaporize to form secondary steam, cause steam cavitation of the electric pump, and seriously affect the service life of the impeller and the pump body.

[0050] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A corrosion resistant pump characterized by, The front pressurizing volute and the rear volute; The front pressurizing volute comprises a pressure pipeline, a throat pipe, a diffusion pipe and a discharge pipe connected in sequence, the pressure pipeline is vertically arranged, the throat pipe and the diffusion pipe jointly form an Archimedes spiral pipe, the discharge pipe comprises a right-angle elbow pipe and a horizontal straight pipe, and the discharge pipe is communicated with the inlet of the rear volute; a nozzle is arranged in the pressure pipeline, and the nozzle is communicated with the outlet of the rear volute through a return pipe; The corrosion-resistant pump further comprises an impeller, a pump cover and a suspension, the pump cover and the rear volute form a complete cavity, the impeller is arranged in the cavity, and the impeller is connected with the pump shaft of the suspension; The flow channel axis of the pressure pipeline and the flow channel axis of the throat pipe and the diffusion pipe are perpendicular to each other at the tangent point of the perpendicular line and the Archimedes spiral; The starting point of the flow channel axis of the throat pipe and the diffusion pipe is any point on the circumference of the rear volute inlet concentric circle, and the diameter of the rear volute inlet concentric circle is greater than or equal to the diameter of the rear volute inlet.

2. The erosion resistant pump of claim 1, wherein, The nozzle is fixedly arranged in the pressure pipeline through a connecting rib or a connecting plate.

3. The erosion pump of claim 1, wherein, The specific arrangement mode that the nozzle is communicated with the outlet of the rear volute through the return pipe is that the nozzle is directly connected with the outlet of the rear volute through the return pipe; or the outlet of the rear volute is provided with an outlet tee, the inlet of the nozzle is provided with a flange, the return pipe is provided with flanges at both ends, and the return pipe is connected with the flange of the inlet of the nozzle and the flange of the outlet tee through the flanges at both ends; or the outlet of the rear volute is provided with a return flange, the suction inlet of the nozzle is provided with a flange, the return pipe is provided with flanges at both ends, and the return pipe is connected with the flange of the inlet of the nozzle and the return flange through the flanges at both ends.

4. The erosion pump of claim 1, wherein, The front pressurizing volute is a spiral Venturi tube.

5. The erosion pump of claim 1, wherein, The rear volute adopts a centrifugal pump body.

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