CN103307198B - Pump pool inherent frequency self-adapting device - Google Patents

Abstract

The invention discloses a method and device for self-adapting the natural frequency of a pump pool. According to the rotation speed of submersible pumps of different models, a liquid with a certain density and volume is reasonably selected and injected into the frequency modulation tube, so that the natural frequency of the same pump pool device can be adjusted. , to avoid resonance between the pump pool and the submersible pump, reduce the vibration amplitude of the pump pool, improve the safety, reliability and service life of the pump pool to meet the speed requirements of different types of submersible pumps. The invention can be applied to a pump pool device matched with a submersible pump.

Description

A pump pool natural frequency self-adaptive device

technical field

The invention relates to a container for placing a submersible pump, in particular to a natural frequency adaptive technology of a pump pool. the

Background technique

Submersible pumps need to be submerged under a certain level of liquid when they work normally, so they need to be placed in a specific container. Such containers are usually called "pump pools", and the current pump pools are generally rectangular and cylindrical containers. . In the actual use process, there are problems: first, the submersible pump needs high-speed rotation during normal operation, which will inevitably cause the vibration of the pump pool. The pump pool is excited by vibration for a long time, fatigue cracks appear, and the service life is greatly shortened, threatening safe production; Second, according to actual use requirements, submersible pumps of different models or different speeds often need to be placed in the same pump pool, but the natural frequency of the same pump pool is fixed, and its natural frequency cannot avoid submersible pumps at various speeds. pump, then the pump pool can easily resonate with the submersible pump. Once resonance occurs, the life of the pump pool and submersible pump will be greatly reduced, and there will be serious safety hazards; third, the vibration of the pump pool will emit noise, resulting in sound polution. In view of the above problems, the current solution is, first, simply fix the pump pool on the ground with bolts to achieve the purpose of reducing the forced vibration, but the effect is not good, and the bolts will inevitably loosen after a period of time; second In the case of resonance between the pump pool and the submersible pump, the pump pool is usually redesigned or a submersible pump with a different speed is replaced to avoid the natural frequency of the two, but this causes waste of resources and increases the cost. the

Contents of the invention

The object of the present invention is to provide a method and device for self-adapting the natural frequency of a pump pool, so that the natural frequency of the same pump pool device can be adjusted to meet the requirements of different types of submersible pump speeds. the

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A method for self-adapting the natural frequency of the pump pool: the submersible pump is installed in the inner cylinder of the pump pool. When the submersible pump is running, when the natural frequency of the pump pool is found to be similar to the speed of the submersible pump, after the two resonate, first screw the Open the frequency modulation tube cap on the upper end of the frequency modulation tube, then inject a liquid of a density into the frequency modulation tube, adjust the volume of the injected liquid until the natural frequency of the pump pool is far away from the speed of the submersible pump, the two do not resonate, and the pump pool is at Until the forced vibration is significantly reduced under the excitation of the submersible pump, the upper frequency modulation cap is finally screwed on to complete the adjustment of the natural frequency of the pump pool. If it is impossible to significantly reduce the vibration of the pump pool by changing the injected volume for the liquid of the above-mentioned selected density, you can unscrew the lower end of the frequency-adjusting tube cap, empty the liquid of the above-mentioned density, and re-screw the upper and lower end of the frequency-adjusting tube cap , choose another liquid with another density, then inject it into the frequency modulation tube, and adjust the volume of the injected liquid again until the natural frequency of the pump pool is far away from the speed of the submersible pump, the two do not resonate, and the pump pool is in the submersible pump Until the forced vibration is significantly reduced under excitation, finally re-screw the upper frequency modulation tube cap to complete the natural frequency adjustment of the pump pool. By repeating the above operation method, since liquids with different densities can be selected and the volume of the injected liquid can be adjusted repeatedly, the overall quality and structure of the pump pool can be changed by the injected liquid, thereby changing the natural frequency of the pump pool and avoiding submerged liquid When the pump is running, it resonates with the pump sump. In addition, for the pump pool that has not been used for a long time, unscrew the lower cap of the frequency modulation tube to drain the liquid in the frequency modulation tube and keep the frequency modulation tube clean. the

A self-adaptive device for the natural frequency of a pump pool, comprising: a frequency-regulating tube, a lower-end frequency-regulating tube cap, an upper-end frequency-regulating tube cap, an inner cylinder, an outer cylinder, a bottom plate, a liquid inlet pipe, a liquid outlet pipe, and a fixing hole. the

The pump pool is a double-layer structure, the inner cylinder and the outer cylinder are both cylindrical cylinders, the outer cylinder is on the outside, the inner cylinder is on the inside, and both the inner cylinder and the outer cylinder are welded vertically on the bottom plate , and a hollow interlayer is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder. The liquid inlet pipe and the liquid outlet pipe are located on the side walls of the inner cylinder body and the outer cylinder body, the liquid inlet pipe is on the top, and the liquid outlet pipe is on the bottom. The upper side and the lower side of the outer cylinder are respectively opened with two rectangular openings, the shapes of the rectangular openings are consistent with the upper and lower ends of the frequency modulation tube, and the two ends of the frequency modulation tube protrude from the two rectangular openings of the outer cylinder respectively. , the lower FM tube cap and the upper FM tube cap are respectively installed at the upper and lower ends of the FM tube. the

As a further improvement of the present invention, the frequency modulation tube is in a spiral shape, located between the inner cylinder and the interlayer of the outer cylinder, closely contacting and winding around the outer wall of the inner cylinder and the inner wall of the outer cylinder, while the transverse frequency modulation tube The cross section is rectangular, which can increase the contact area with the outer wall of the inner cylinder and the inner wall of the outer cylinder, making the contact more closely. In addition, both ends of the FM tube are processed with internal threads, and the outer walls of the lower FM cap and the upper FM cap are processed with external threads for matching installation with the internal threads of the nozzles at both ends of the FM tube. the

As a further improvement of the present invention, the middle of the frequency modulation tube is hollow, which is used to fill liquid with a certain density and volume. the

As another improvement of the present invention, the frequency modulation tube is made of elastic material, which can further reduce the vibration of the pump pool. the

As a further improvement of the present invention, the bottom plate is provided with four fixing holes for fixing the submersible pump. the

Beneficial effects of the present invention: for the same pump pool, after resonating with submersible pumps of different models or different speeds, the present invention injects liquid through the frequency modulation tube to change the natural frequency of the pump pool itself, thereby avoiding the occurrence of submersible pumps. Resonance enables the same pump pool to be paired with submersible pumps of different models or different speeds, greatly reducing material loss and cost. In addition, the frequency modulation tube in the present invention is made of elastic material, which can buffer the vibration excitation of the submersible pump, prolong the service life of the pump pool, and improve its safety and reliability. the

Description of drawings

Fig. 1 is a schematic structural diagram of a natural frequency self-adaptive device for a pump pool in the present invention. the

In Fig. 1: 1. Inner cylinder, 2. Outer cylinder, 3. Lower frequency modulation cap, 4. Bottom plate, 5. Liquid inlet pipe, 6. Frequency modulation pipe, 7. Upper frequency modulation cap, 8. Liquid outlet pipe , 12, rectangular mouth. the

Fig. 2 is a cross-sectional view of a pump pool natural frequency self-adapting device. the

Fig. 3 is a structural schematic diagram of the frequency modulation tube and the frequency modulation tube cap. the

Among Fig. 3: 3, lower end FM pipe cap, 6, FM pipe, 7, upper end FM pipe cap, 9, internal thread, 10, external thread. the

Figure 4 is a top view of the bottom plate. the

Among Fig. 4: 4, bottom plate, 11, fixing hole. the

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clarified below in conjunction with the accompanying drawings 1, 2, 3 and 4 in the embodiments of the present application , complete description, obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. the

A pump pool natural frequency adaptive method is as follows:

The submersible pump is fixed in the cylinder body 1 of the pump pool through the four fixing holes 11 on the bottom plate 4. When the submersible pump is operated, if it is found that the natural frequency of the pump pool is similar to the speed of the submersible pump, after the two resonate, first Unscrew the frequency modulation tube cap 7 on the upper end of the frequency modulation tube 6, then inject a liquid of a certain density into the frequency modulation tube 6, and repeatedly adjust the volume of the injected liquid until the natural frequency of the pump pool is far away from the speed of the submersible pump, and the two do not resonate , and the forced vibration of the pump pool is significantly reduced under the excitation of the submersible pump, and finally the upper frequency modulation tube cap 7 is re-screwed to complete the natural frequency adjustment of the pump pool. If it is impossible to significantly reduce the vibration of the pump pool by changing the injected volume for the liquid of the above-mentioned selected density, then you can unscrew the lower frequency modulation tube cap 3, empty the liquid of the above density, and then re-screw the upper and lower frequency modulation tubes Cap 3, select another density of liquid again, and then inject it into the frequency modulation tube 6, adjust the volume of the injected liquid until the natural frequency of the pump pool is far away from the speed of the submersible pump, the two do not resonate, and the pump pool is in the submersible Until the forced vibration is significantly reduced under the excitation of the liquid pump, at last the upper frequency modulation cap 7 is re-screwed to complete the adjustment of the natural frequency of the pump pool. Since liquids with different densities can be selected and the volume of the injected liquid can be adjusted repeatedly, the overall quality and structure of the pump pool can be changed by the injected liquid, thereby changing the natural frequency of the pump pool and avoiding the collision with the pump pool when the submersible pump is running. Resonance occurs. In addition, for the pump pool that has not been used for a long time, unscrew the lower frequency modulation tube cap 3 of the frequency modulation tube 6, drain the liquid in the frequency modulation tube 6, and keep the frequency modulation tube 6 clean.

The preferred filling liquid can be common water, kerosene, alcohol, etc., but it is by no means limited to the liquids listed above. Any liquid with different densities that is not corrosive to the frequency modulation tube can be used as the filling liquid. the

Referring to Figure 1, a self-adaptive device for the natural frequency of a pump pool includes: a frequency modulation tube 6, a lower frequency modulation tube cap 3, an upper frequency modulation tube cap 7, an inner cylinder 1, an outer cylinder 2, a bottom plate 4, and a liquid inlet pipe 5. Outlet pipe 8. The pump pool is a double-layer structure, the inner cylinder 1 and the outer cylinder 2 are cylindrical cylinders, the outer cylinder 2 is on the outside, the inner cylinder 1 is on the inside, and the inner cylinder 1 and the outer cylinder 2 are welded vertically A hollow interlayer is formed on the bottom plate 4 and between the outer wall of the inner cylinder 1 and the inner wall of the outer cylinder 2 . The liquid inlet pipe 5 and the liquid outlet pipe 8 are located on the side walls of the inner cylinder body 1 and the outer cylinder body 2, the liquid inlet pipe 5 is on the top, and the liquid outlet pipe 8 is on the bottom. Two rectangular openings 12 are respectively opened on the upper side and the lower side of the outer cylinder body 2. The shapes of the rectangular openings 12 are consistent with the upper and lower ends of the frequency modulation tube 6. 12 stretches out, and the lower end frequency modulation tube cap 3 and the upper end frequency modulation tube cap 7 are respectively installed on the upper and lower ends of the frequency modulation tube. the

As shown in FIG. 2 , the tuning tube 6 is wound between the interlayers of the inner cylinder 1 and the outer cylinder 2 , and is completely in close contact with the outer wall of the inner cylinder 1 and the inner wall of the outer cylinder 2 . The frequency modulation tube 6 is hollow in the middle, and is used for filling the liquid of certain density and volume. the

Referring to Figure 3, the frequency modulation tube 6 is helical, so that it is convenient to wrap around the cylindrical barrel, and the cross section of the frequency modulation tube 6 is rectangular, which can increase the contact with the outer wall of the inner cylinder 1 and the inner wall of the outer cylinder 2 area, making the contact more intimate. In addition, both ends of the frequency modulation tube 6 are processed with internal threads 9, and the outer walls of the lower end frequency modulation tube cap 3 and the upper end frequency modulation tube cap 7 are processed with external threads 10 for matching installation with the internal threads of the nozzles at both ends of the frequency modulation tube. The FM tube is made of elastic material rubber, which can further reduce the vibration of the pump pool. the

Referring to Fig. 4, the bottom plate 4 is provided with four fixing holes 11 for fixing and installing the submersible pump. the

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element. the

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention. the

Claims (3)

1. a pump pond intrinsic frequency self-reacting device, is characterized in that: comprise phasitron, lower end frequency modulation pipe cap, upper end frequency modulation pipe cap, inner barrel, outer cylinder body, base plate, feed tube, drain pipe, fixing hole; Described pump pond intrinsic frequency self-reacting device is double-decker, inner barrel and outer cylinder body are all cylindrical tubes, and outer cylinder body is in outside, and inner barrel is in inner side, inner barrel and outer cylinder body are all vertically welded on base plate, and form hollow sandwich between the outer wall of inner barrel and the inwall of outer cylinder body; The upper side and lower side of described outer cylinder body has two rectangular opening, and the shape of rectangular opening is consistent with the both ends of the surface up and down of phasitron, and the two ends of phasitron are stretched out from two of outer cylinder body rectangular opening respectively; Described phasitron is spirality, and between inner barrel and the hollow sandwich of outer cylinder body, close contact is wrapped between the outer wall of inner barrel and the inwall of outer cylinder body; The cross section of described phasitron is rectangle, and the two ends of described phasitron are processed with internal thread, and described frequency modulation pipe cap outer wall is processed with external screw thread, with the internal thread mounted in pairing mode of the phasitron two ends mouth of pipe; Hollow in the middle of described phasitron, the liquid of be used for annotating certain density and volume.

2. a kind of pump pond as claimed in claim 1 intrinsic frequency self-reacting device, is characterized in that: the liquid of described injection is not for having corrosive liquid.

3. a kind of pump pond as claimed in claim 1 intrinsic frequency self-reacting device, is characterized in that: the material of described phasitron is elastomeric material.