A high and low temperature chemical process pump

Abstract

The present invention discloses a high-low temperature chemical process pump. A high-low temperature chemical process pump comprises a pump body, a drain pipe is arranged at the upper end of the pump body, the drain pipe is connected to an external water pipe through a connecting flange and bolts and nuts, a folded pipe is evenly fixedly installed on the side wall of the drain pipe, the inclined pipe of the folded pipe is arranged above the drain pipe, and a piston is slidably arranged inside the inclined pipe of the folded pipe, and a push rod is welded on the side of the piston. The chemical process pump uses the pressure generated in the pump body to press the connecting flange of the external pipe and the drain pipe through the push rod, thereby reducing the bearing pressure of the bolts and preventing the bolts and nuts from loosening, and as the internal pressure of the pump body increases, the pressing force of the push rod on the connecting flange increases, thereby ensuring the sealing between the drain pipe and the external pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of process pump equipment, and in particular relates to a high-low temperature chemical process pump. Background Art

[0002] Chemical process pump is a general term for various pumps used in the chemical production process. The pump is equipped with high power, high speed, small overall size, simple structure, and is easy to maintain, but it has high temperature, is easy to wear, and has a large maintenance coefficient. There are many types of chemical process pumps. According to their working principles, they can be divided into vane pumps, such as centrifugal pumps, axial flow pumps, mixed flow pumps, partial flow pumps, vortex pumps, etc.; positive displacement pumps, such as reciprocating pumps (including plunger pumps, piston pumps, diaphragm pumps, etc.); rotary pumps (including screw pumps, liquid ring pumps, gear pumps, vane pumps, Roots pumps, radial piston pumps, etc.); other types of pumps, such as high-pressure methylamine pumps, cryogenic pumps, phosphoric acid slurry pumps, etc., according to the production process or product characteristics.

[0003] In the actual operation of the process pump, the connecting flanges of the external water pipe and the pump body drain pipe are fixedly connected by the cooperation of bolts and nuts. The pressure inside the pump body impacts the external water pipe and the drain pipe. After long-term use, the bolts and nuts between the connecting pipe and the drain pipe are prone to loosening, which will cause leakage and increase the frequency of maintenance. Therefore, targeted design is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a high and low temperature chemical process pump for use to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a high and low temperature chemical process pump, comprising a pump body, a drain pipe is arranged at the upper end of the pump body, the drain pipe is connected to an external water pipe through a connecting flange and bolts and nuts, a folded pipe is evenly fixedly installed on the side wall of the drain pipe, the inclined pipe of the folded pipe is arranged above the drain pipe, and a piston is slidably arranged inside the inclined pipe of the folded pipe, and a push rod is welded to the side of the piston;

[0006] A rubber pressing block corresponding to the push rod is fixedly arranged on the side of the connecting flange at the end of the external water pipe, and the side of the rubber pressing block opposite to the push rod is a curved surface;

[0007] A stepped hole is provided inside the rubber pressing block, a fastening bolt is provided inside the stepped hole, and the fastening bolt passes through the stepped hole and is threadedly connected to a threaded hole on the side of the connecting flange at the end of the drain pipe;

[0008] Three folded pipes are evenly arranged on the side wall of the drain pipe, and the vertical pipes of the folded pipes are fixedly connected to the connecting flange of the drain pipe through a fixing frame.

[0009] Preferably, a limiting ring is welded on the inner side wall of the inclined tube of the folded tube.

[0010] Preferably, the outer surface of the piston is coated with epoxy resin paint.

[0011] The technical effects and advantages of the present invention are as follows: When the internal pressure of the high-low temperature chemical process pump gradually increases, the fluid inside the pump body flows into the inside of the folded tube, pushing the piston to slide inside the folded tube and driving the push rod to press the connecting flange at the end of the external water pipe, so that the connecting flanges of the external water pipe and the drain pipe are tightened, reducing the pressure on the bolts and nuts, avoiding the loosening of the bolts and nuts after long-term use, extending the intervals between regular maintenance by the staff, and the pressing force of the push rod on the connecting flange can change with the pressure in the pump body, ensuring that the force on the bolts and nuts is relatively constant, ensuring the service life, and the sealing stability between the drain pipe and the external water pipe connecting flange is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a cross-sectional view of the connection between the folded tube and the piston;

[0014] Figure 3 It is a cross-sectional view of the connection between the rubber pressure block and the connecting flange.

[0015] In the figure: 1. Pump body; 2. Drain pipe; 3. Connecting flange; 4. External water pipe; 5. Folding pipe; 6. Piston; 7. Push rod; 8. Rubber pressure block; 9. Step hole; 10. Fastening bolt; 11. Fixing bracket; 12. Limiting ring. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention provides Figure 1-3A high and low temperature chemical process pump shown in the figure comprises a pump body 1, a drain pipe 2 is arranged at the upper end of the pump body 1, the drain pipe 2 is connected to an external water pipe 4 through a connecting flange 3 and bolts and nuts, a folded pipe 5 is evenly and fixedly installed on the side wall of the drain pipe 2, the oblique tube of the folded pipe 5 is arranged above the drain pipe 2, and a piston 6 is slidably arranged inside the oblique tube of the folded pipe 5, and a push rod 7 is welded to the side of the piston 6. When the internal pressure of the pump body 1 gradually increases, the fluid inside the pump body 1 flows into the inside of the folded pipe 5, pushing the piston 6 to slide inside the oblique tube of the folded pipe 5, driving the push rod 7 to press the connecting flange 3 at the end of the external water pipe 4, so that the connecting flange 3 of the external water pipe 4 and the drain pipe 2 is pressed tightly, reducing the pressure on the bolts and nuts, avoiding the loosening of the bolts and nuts after long-term use, and extending the interval of regular maintenance by the staff.

[0018] A rubber pressing block 8 corresponding to the push rod 7 is fixedly arranged on the side of the connecting flange 3 at the end of the external water pipe 4, and the side of the rubber pressing block 8 opposite to the push rod 7 is an arc surface, which prevents the end of the push rod 7 from directly squeezing the side of the connecting flange 3 and causing damage to the push rod 7 or the connecting flange 3, and ensures that the push rod 7 stably presses the connecting flange 3 by squeezing the rubber pressing block 8.

[0019] A stepped hole 9 is provided inside the rubber pressing block 8, and a fastening bolt 10 is provided inside the stepped hole 9. The fastening bolt 10 passes through the stepped hole 9 and is threadedly connected to the threaded hole on the side of the connecting flange 3 at the end of the drain pipe 2, ensuring that the rubber pressing block 8 is stably fixed to the connecting flange 3 through the fastening bolt 10, thereby preventing the rubber pressing block 8 from quickly falling off the connecting flange 3 under the extrusion of the push rod 7.

[0020] Three folded tubes 5 are evenly arranged on the side wall of the drain pipe 2, and the vertical pipe of the folded tube 5 is fixedly connected to the connecting flange 3 of the drain pipe 2 through a fixing frame 11, ensuring that the push rods 7 on the upper parts of the three folded tubes 5 press the connecting flange 3 of the external water pipe 4 at the same time to ensure the force balance of the connecting flange 3, and the connection strength between the folded tube 5 and the drain pipe 2 is strengthened by the fixing frame 11 to avoid the deformation of the assembled folded tube 5 when the push rod 7 exerts too much pressure on the connecting flange 3 of the drain pipe 2.

[0021] A limiting ring 12 is welded on the inner side wall of the inclined tube of the folded tube 5 to limit the moving path of the piston 6 in the folded tube 5 .

[0022] The outer surface of the piston 6 is coated with epoxy resin paint to improve the wear resistance and corrosion resistance of the piston 6, thereby increasing the service life.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high and low temperature chemical process pump, comprising a pump body (1), characterized in that: A drainage pipe (2) is arranged at the upper end of the pump body (1), and the drainage pipe (2) is connected to an external water pipe (4) through a connecting flange (3) and bolts and nuts. A folded pipe (5) is evenly and fixedly installed on the side wall of the drainage pipe (2), and the oblique pipe of the folded pipe (5) is arranged above the drainage pipe (2), and a piston (6) is slidably arranged inside the oblique pipe of the folded pipe (5), and a push rod (7) is welded to the side of the piston (6); A rubber pressing block (8) corresponding to the push rod (7) is fixedly arranged on the side of the connecting flange (3) at the end of the external water pipe (4), and the side of the rubber pressing block (8) opposite to the push rod (7) is an arc surface; The rubber pressing block (8) has a stepped hole (9) formed inside, a fastening bolt (10) is provided inside the stepped hole (9), and the fastening bolt (10) passes through the stepped hole (9) and is threadedly connected to a threaded hole on the side of the connecting flange (3) at the end of the drain pipe (2); Three folded pipes (5) are evenly arranged on the side wall of the drainage pipe (2), and the vertical pipes of the folded pipes (5) are fixedly connected to the connection flange (3) of the drainage pipe (2) via a fixing frame (11).

2. A high and low temperature chemical process pump according to claim 1, characterized in that: A limiting ring (12) is welded on the inner side wall of the inclined tube of the folded tube (5).

3. A high and low temperature chemical process pump according to claim 2, characterized in that: The outer surface of the piston (6) is coated with epoxy resin paint.

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