CN113202809A

CN113202809A - Structure of totally-enclosed water pump capable of preventing liquid molecules from leaking out of pump

Info

Publication number: CN113202809A
Application number: CN202110581868.5A
Authority: CN
Inventors: 梁嘉麟
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2021-05-22
Filing date: 2021-05-22
Publication date: 2021-08-03

Abstract

The structure of a totally enclosed water pump which can not leak liquid molecules in the pump to the outside: firstly, the rotor (2) is surrounded by a metal sealing isolation cavity (5) in a three-dimensional manner, and the bottom of the rotor is provided with a motor shaft seal (7), an inflating nozzle mechanism (P) and a pressure display device interface (K); secondly, a metal sealing structure (10) of a liquid pump (9) forming the main body is surrounded in a three-dimensional manner, and a liquid inlet pipe interface (11) and a liquid outlet pipe interface (8) are arranged on the liquid pump (9); thirdly, the metal sealing structure (10) and the metal sealing isolation cavity (5) are connected with each other through non-detachable welding; fourthly, in the structural entity of the water pump, the rotation direction of the blades (Y) is driven by the liquid which is extended into the liquid pump (9) through the motor rotating shaft (6), and the driven liquid flows away from the direction in which the motor exists. The invention can come out with the all-round amphibious water pump with extremely high cost performance and creates conditions for the water pump to become an upgrading product of the water pump.

Description

Structure of totally-enclosed water pump capable of preventing liquid molecules from leaking out of pump

Technical Field

The invention relates to a structure of a fully-sealed water pump which can not leak liquid molecules in the pump to the outside.

Background

At present, liquid pumps with different specifications and types come out endlessly, and are power equipment with quite wide and mature purposes, and the defects are that: the liquid pump in the prior art adopts various sealing structures which are mainly formed by sealing rings with various specifications made of rubber and plastic high polymer materials and gaps with rough and smooth metal surfaces and compressed, and the so-called sealing in the prior art can only be regarded as a 'semi-sealing' measure which can absolutely not stop fluid molecules such as common air molecules and water molecules from passing through, otherwise, common automobile tires and bicycle tires can never be inflated. Even though the various types of inflating nozzle structures (mechanisms) comprising rubber or/and comprising smooth metal elements, which constitute the tyre, are themselves capable of allowing the passage of the fluid molecules therethrough at all times, the rate of passage is slow, just as slow as the passage through the tyre.

The prior art at present has two problems as follows:

one is as follows: as the alkali pump which needs high-lift stroke in the water pump, for example, the alkali pump which is used in the largest amount in the chemical field is mainly used on land, the needed lift stroke is generally higher or higher, but due to the structural restriction of the prior art of the conventional alkali pump, the lift stroke cannot be designed to be very high, otherwise, the excessively high lift stroke can cause the adverse effect that the high-pressure feedback force in the alkali pump can be increased rapidly along with the high-pressure feedback force before the outlet of the alkali pump, and the normal work of a driving motor which forms the alkali pump can be directly influenced. The sealing force on the motor rotating shaft must be strengthened, but the sealing force still leaves the ideal degree to a great extent despite great technical expense, so that the requirement of the sealing degree on the motor rotating shaft cannot be met without reducing the lift of the alkali pump intentionally.

The second is that: the leakage prevention problem of water pumps, especially alkaline pumps, is a big problem that cannot be ignored, and it can be said that all products in the prior art have not yet achieved the requirement of not leaking the sealing degree of the liquid molecules conveyed inside, which can be reached by the pump when the liquid molecules are not leaked. When chemical pumps are used for pumping expensive or highly toxic chemical liquid raw materials, the requirement for preventing liquid molecules from leaking out of the pumps is a matter of course.

In summary, the two problems of the "the lift of the water pump is not limited by the sealing degree of the motor rotating shaft" and the "the liquid molecules conveyed in the water pump cannot leak" are solved, and the two problems obviously become two key problems for improving the grade of the water pump technology in the prior art.

Disclosure of Invention

The purpose of the invention is as follows:

the two key problems in the prior art are solved from the two key points that the lift of the water pump is not limited by the sealing degree of the rotating shaft of the motor and the liquid molecules conveyed in the water pump cannot leak. Of course, the problems of unlimited deep submergence of the conventional (common) submersible pump and the like can be solved.

The key points of the invention are as follows:

starting with the "structure of a totally enclosed water pump" as described in the title of the present invention, a completely new design of water pump (including the problems addressed by the above) is proposed from the structure for reference.

Compared with the prior art, the invention has the characteristics that:

on the premise of solving the two key point contents, the characteristics of simplest structure, easiest manufacture and highest cost performance are realized.

Drawings

Fig. 1 illustrates an embodiment of the structure of the present invention, and fig. 2 is a partial schematic view of fig. 1.

1: a motor stator embedded in the winding; 2: a motor rotor; 3: a motor bearing; 4: a power line; 5: a fully sealed metal isolation chamber; 6: a motor shaft; 7: a motor shaft seal or a position for arranging the shaft seal; 8: a liquid discharge pipe interface; 9: a liquid pump; 10: the metal sealing structure at least forms the periphery and the bottom of the liquid pump; 11: a liquid inlet pipe interface; 12: an inflatable connecting pipe made of metal is adopted; d: after an upper and a lower fully-sealed metal isolation entities (a metal isolation cavity and a liquid pump metal sealing structure) are folded, a welding ring part with the best section position is recommended to be selected; q: the metal sheath which is used for preventing the fluid molecules from passing through is added to the electric field lines inside the invention.

Detailed Description

In order to achieve the above object of the present invention, the following technical solutions can be adopted:

the whole structure of the infusion pump comprises a driving motor consisting of a stator 1 and a rotor 2 and a liquid pump 9 as a pressure infusion main body; the method is characterized in that:

firstly, at least the rotor 2 is surrounded by a metal seal isolation cavity 5 in a three-dimensional manner, and a motor shaft seal 7 and a charging nozzle mechanism P communicated with a pressure display device interface K at most through a charging connecting pipe 12 made of metal are arranged at the conical bottom of the metal seal isolation cavity 5 (or the two are directly positioned on the outer wall of the metal seal isolation cavity 5);

all splicing gaps related to the metal sealing isolation cavity 5 (which is detachable in the prior art) are connected by a non-detachable welding process.

1) The purpose of the above-mentioned tapered bottom is to:

the invention expands with heat and contracts with cold because of the air in the motor in the processes of starting (the machine body becomes hot) and stopping (the machine body becomes cold). Therefore, after the machine is shut down, a certain amount of external water is allowed to upwards infiltrate from the position of the motor shaft seal 7 and is temporarily stored in the conical bottom volume of the metal seal isolation cavity 5, and after the machine is started, the temporarily stored external water is withdrawn from the original path to the external water. … … are provided.

2) The mechanism of structurally using metal welding (the purpose of solving infinite depth and assisting in solving the problem of preventing external liquid molecules from leaking out and being transmitted by the invention) is as follows:

the motor shaft seal 7 is arranged at the bottommost position of the metal seal isolation cavity 5, and the motor shaft seal 7 is the largest molecule 'inlet' formed by the gap allowing water molecules or air molecules to pass through, however, at the high position corresponding to the plane of the 'inlet', there is no other gap allowing the fluid molecules to pass through, so that a fluid molecule channel allowing the fluid molecules to pass through formed between the 'inlet' and the 'outlet' cannot be formed in the metal seal isolation cavity 5, and thus the air pressure which is filled in the metal seal isolation cavity 5 in advance and is balanced with the external high-pressure water body is reliably realized:

the penetration of the external high-pressure water body to the interior of the upper metal sealing isolation cavity 5 in a molecular form is supported downwards through a movable fit gap (the gap with the maximum gap distance) of the motor shaft seal 7.

The conclusion is clear:

there is only that there is an "inlet" of at least one (e.g. many) of said fluid molecules substantially in a horizontal plane, and there is no at least one like "outlet" located above it, then there is absolutely no "bottom-to-top" molecular passage of said fluid in the motor as a whole. It is clear that the so-called sealing gaps between all detachable combination parts of the prior art do not prevent the passage of the fluid molecules.

3) The purpose of the above-mentioned charging nozzle means P, whose "inlet" is substantially flush with the motor shaft seal 7 (upper top external water seepage "inlet"), is: the physical balance condition can be directly created for the deep diving of the water pump infinitely through the prior 'inflation pressurization'. If the "inlet" of the nozzle mechanism P is arranged at the top of the fully sealed metal isolation chamber 5, it is certainly a nuisance: its "inlet" will become "outlet" and form the above-mentioned fluid molecular channel "from bottom to top" which should not be allowed to exist with the dynamic fit gap "inlet" at the position of the motor shaft seal 7 at the lower part thereof.

The 'inflation pressurization' data is higher than the water depth pressure of the water pump sinking bottom, and after the water pump sinking bottom, the internal and external pressure of the water pump can reach the level degree naturally after the pressure is released through the gap of the motor shaft seal 7.

One of the most complicated ways of the "inflation and pressurization" of the present invention is that if the diving depth is very large, for example, kilometers deep, then a measure of connecting a kilometer or more length inflation tube to the inflation nozzle mechanism P in advance can be adopted.

After the water pump is filled with partial gas on the water surface, after the water pump is positioned at the water bottom, supplementary inflation is carried out on the water surface until the inflation pressurization reaches the approved data higher than the external water body pressure.

At least the periphery and the bottom of a liquid pump 9 forming the main body are also surrounded by a metal sealing structure 10 in a three-dimensional manner, and the liquid pump 9 is provided with a liquid inlet pipe interface 11 and a liquid outlet pipe interface 8;

all the splicing seams involved in the metal sealing structure 10 (actually, the housing of the liquid pump 9 — which is removable in the prior art) are connected by a non-removable welding process.

Thirdly, the metal sealing structure 10 and the metal sealing isolation cavity 5 are connected with each other by a welding process which is not detachable and is positioned at the welding ring part D to form a structural entity of the whole machine of the full-sealing type water pump (conditions are created for finally realizing the whole machine entity of the full-sealing type);

fourthly, in the structural entity of the water pump, the rotation direction of the blade Y driven by the liquid which is inserted into the liquid pump 9 through the motor rotating shaft 6 causes the driven liquid to flow away from the existing direction of the motor, but does not cause the driven liquid to flow towards the existing direction of the motor;

the liquid flow direction results in: the portion of the driving blade Y that draws liquid into the liquid pump 9 is on the upper side of the metal seal structure 10, and the portion of the driving blade Y that discharges liquid out of the liquid pump 9 is on the lower side of the metal seal structure 10. -or, more briefly: the liquid is drawn up on the upper side (back surface) of the driving blade Y, and the transported liquid is discharged on the lower side (front surface).

At this time, when the power of the dragging motor is constant, the lift of the water pump is only limited by the flow (when the flow is large, the lift is small), and when the flow is constant, the lift of the water pump can be increased along with the power of the dragging motor, so that the limitation of the continuous increase of the high lift caused by the limitation of the sealing force of the motor shaft seal 7 by the pump structure itself in the prior art is absolutely avoided.

For example: the pressure of the wind above the propeller of a helicopter varies within a range of slightly less than atmospheric pressure, regardless of the magnitude of the downward wind force when the propeller of the helicopter rotates. This slight pressure change is absolutely easily coped with. It is clear that the technical requirements for the sealing strength of the motor shaft seal 7, which the driving vane Y in the present invention faces when it causes a slight pressure change in the back pressure, will be very easy to handle.

Therefore, the restriction of the over-growth in the prior art is caused by the inherent habitual flow direction of the liquid during driving and transportation, i.e., the direction of the liquid transportation from "bottom to top" (which is exactly opposite to the present invention) as illustrated in fig. 1, which is used in the conventional design in the art. The flow direction of the liquid to be conveyed driven by the blade in the water pump is not counted in most of water pumps with low head requirements, and the simple design of the whole structure is probably also facilitated. However, the development of chemical pumps, mainly for terrestrial use, such as alkaline pumps, still continues to use the previously used "flow direction" of the liquid to be delivered, with the consequent undesirable consequences of the prior art.

Obviously, on the premise of low requirement on the pump lift, the rotation direction of the blade Y driven by the liquid entering the liquid pump 9 through the motor shaft 6 in the water pump structure entity is changed back to:

the driven liquid is caused to flow in the direction of the existing motor, i.e. the flow direction of the prior art is still returned to the opposite direction of the present invention, and other design schemes are not changed, so that the requirement of extremely high cost performance can be achieved compared with the prior art.

If the technical measures in the above-mentioned "one", "two" and "three" can be adopted simultaneously with the "four" measure, the invention can lay the foundation for manufacturing the all-purpose water pump by the simplest technical means, namely:

in addition to its features of the lift, it also enables the most technically demanding submersible pump to be operated once for a very long period of time without being limited by its depth of submersion, and without any risk of leakage of liquid molecules from the pump to the outside, and this is achieved both when the pump is used underwater and when it is used on land.

Not only can meet the high technical level requirement, but also can ensure that the cost performance of the device is extremely high.

Here, one more point is emphasized:

finally, according to the principle of the above-mentioned "one" that the formation of the fluid molecular channel must be prevented, the location of the drilling and threading should be very specific when the soft power line is externally connected according to the present invention:

if the power line 4 of the present invention is threaded into the motor from the top bore of the metal sealed isolation chamber 5 to make a connection with the stator 1 as in the conventional manner of the prior art:

the rubber-plastic sheath itself and the drill-hole threading site then form an "access opening" through which the fluid molecules can pass. The upper position is called as an outlet, a movable fit gap formed by the upper position and the motor rotating shaft 6 at the bottom of the metal sealed isolation cavity 5, namely the lower inlet, forms a molecule fluid channel with inlet and outlet, and after long use, the external highest high-pressure water at the bottom of the motor enters the motor from bottom to top along the gap of the motor rotating shaft 6, extrudes the internal air and enables the internal air to enter the power line 4 in a semi-sealed rubber plastic sheath in a molecule form, and finally the periphery of the sheath exposed in the external water is discharged in a molecule form. It is inevitable to damage the motor rotor 2 by contact with water.

Obviously, the solution is: the power line 4 should be inserted from the portion of the conical bottom (shaft seal position 7 of the motor rotating shaft 6) constituting the metal seal isolation chamber 5 of the present invention, and it must be noted that:

in the lead segment part of the transition power line 4 passing through the space part of the tapered outer bottom of the metal seal isolation cavity 5, a circle of additional metal sheath Q of the power line 4 needs to be sleeved outside, and the front end and the rear end of the metal sheath Q are respectively positioned on the upper part of the welding ring part D and the tapered outer bottom of the metal seal isolation cavity 5 in a welding mode, which is shown in detail in the schematic diagram of fig. 2.

The purpose is as follows: the power line 4 which is drilled and threaded from the outside water body into the rubber-plastic sheath with a certain section area can not be an entity which can not stop the passing of the fluid molecules and exists in the part which is not existed in the invention.

The final penetration of the power line 4 into the metallic sealed insulating cavity 5 constituting the present invention is not as simple as the prior art, but can always be properly solved according to the principle of "stopping the passage of fluid molecules", however, the small local trouble will bring great benefit or the highest "cost performance" to the whole machine.

In addition, because the whole structure of the present invention belongs to the model of a totally enclosed type which is never detachable, the service life of the one-off service life of the dragging motor adopted in the present invention is completely determined.

It is said that: the non-detachable full-sealed piston type electric refrigerating compressor used in domestic refrigerator produced in China (the abrasion strength of the compressor is the largest) has the service life of 10-20 years generally, and the similar compressor produced in Japan has the service life of more than 30 years generally.

Claims

1. The structure of a totally enclosed water pump which can not leak liquid molecules in the pump to the outside:

the whole structure of the infusion pump comprises a driving motor consisting of a stator (1) and a rotor (2) and a liquid pump (9) serving as a pressure infusion main body;

the method is characterized in that:

firstly, at least the rotor (2) is surrounded by a metal sealing isolation cavity (5) in a three-dimensional manner, and a motor shaft seal (7) and an inflating nozzle mechanism (P) and a pressure display device interface (K) which are communicated at most through an inflating connecting pipe (12) are arranged at the conical bottom of the metal sealing isolation cavity (5);

all splicing gaps related to the metal sealing isolation cavity (5) are connected through a non-detachable welding process;

at least the periphery and the bottom of a liquid pump (9) forming the main body are also surrounded by a metal sealing structure (10) in a three-dimensional manner, and the liquid pump (9) is provided with a liquid inlet pipe interface (11) and a liquid outlet pipe interface (8);

all splicing gaps related to the metal sealing structure (10) are connected through a non-detachable welding process;

thirdly, the metal sealing structure (10) and the metal sealing isolation cavity (5) are connected with each other through a welding process which is not detachable and is positioned at a welding ring part (D) to form a structural entity of the whole fully-sealed water pump of the whole machine;

fourthly, the rotation direction of a blade (Y) driven by the liquid which is extended into the liquid pump (9) through the motor rotating shaft (6) in the structural entity of the water pump causes the driven liquid to flow away from the direction in which the motor exists, but does not cause the driven liquid to flow towards the direction in which the motor exists;

the driving blade (Y) is arranged above the metal sealing structure (10) forming the liquid pump (9) at the position where the extracted liquid enters, and is arranged below the metal sealing structure (10) forming the liquid pump (9) at the position where the liquid is discharged.

2. The effect of the structure of the hermetically sealed water pump according to claim 1 on the lift of the pump without causing external leakage of liquid molecules inside the pump:

the method is characterized in that:

on the premise of a certain power of the dragging motor, the lifting distance of the water pump structure is only limited by the flow, and the limitation of adopting the high lifting distance due to the structural characteristic of the water pump structure in the prior art is absolutely avoided.

3. The special design scheme of the structure of the totally enclosed water pump for transporting liquid molecules in the pump without external leakage according to claim 1 is as follows:

the method is characterized in that:

on the premise of low requirement on the pump lift, the rotation direction of a liquid driving blade (Y) which is extended into a liquid pump (9) through a motor rotating shaft (6) in a water pump structure entity is changed into: the driven liquid is caused to flow in the direction in which the motor is present, while the other design details are unchanged, however, the requirement of extremely high cost performance can still be achieved compared with the prior art.