CN101334024B - A high pressure gear water pump - Google Patents

Abstract

The invention discloses a high pressure gear water pump, which comprises a front end cover, a rear end cover and a pump body which form an enclosed space together. A pair of main axle and driven axle which is meshed mutually and driven by a driving gear and a driven gear are arranged in the pump body, floating front and rear side plates are respectively installed on both sides of the two working gears, and ceramic coatings are arranged on end surfaces where the front and rear side plates are contacted with the working gears as well as two inner hole walls of the front and rear side plates; 1 to 4 grooves in total are arranged on the wall directing toward one side of a liquid sucking opening of the high pressure gear water pump inside the two inner holes of the front side plate, and a water delivering channel for communicating the grooves and a liquid discharging hole of the high pressure gear water pump is arranged on the front side plate; 1 to 4 grooves in total are arranged on the wall directing to one side of a liquid sucking opening of the high pressure gear water pump inside the two inner holes of the rear side plate, and a water delivering channel for communicating the grooves and the liquid discharging hole of the high pressure gear water pump is arranged on the rear side plate. The high pressure gear water pump has the advantages of small abrasion and high volumetric efficiency.

Description

A high pressure gear water pump

technical field

The invention relates to a high-pressure water pump, in particular to a high-pressure gear water pump.

Background technique

The common high-pressure water pump is a centrifugal water pump. In order to make the outlet pressure reach a high pressure level, multi-stage series connection must be used. Therefore, this high-pressure water pump has a complex structure, large volume, heavy weight, many consumables, and high price. The usual positive displacement pumps (gear pumps, vane pumps, plunger pumps, etc.) use oil as the medium, because the oil is easier to form a lubricating oil film and has anti-corrosion properties, which can ensure the normal operation of the positive displacement pump. Therefore, the general high-pressure gear pump is also an oil pump with oil as the medium. High-pressure gear pumps used in pure water transmission need to solve the problems of pump water capacity (corrosion resistance, wear resistance, self-lubricating film, etc.) and serious leakage (the viscosity of water is 1/30 to 1/50 of that of oil) . In the prior art, some researchers proposed that by setting the front and rear pressure compensation plates in the pump body of the high-pressure gear pump, and setting a ceramic layer on the end surface of the pressure compensation plate and the two intermeshing gears on the transmission shaft, etc. The solution preliminarily solves the limitation that general high-pressure gear pumps can only be applied to oil medium. However, due to the high pressure of the discharge port of the pump and the small pressure of the liquid suction port of this high-pressure gear water pump, the radial unbalanced force causes the journal of the transmission shaft to wear the bearing hole seriously, resulting in unsatisfactory dynamic characteristics of the pump. Moreover, the volumetric efficiency of this high-pressure gear pump is not high, and the control of leakage is not ideal.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the prior art and provide a high-pressure gear water pump with less wear, high transmission quality, low noise, high volumetric efficiency and less leakage.

The technical scheme adopted for realizing the purpose of the present invention: a high-pressure gear water pump, including a front end cover, a rear end cover and a pump body, the front and rear end covers and the pump body form a closed space, and a drive shaft and a pump body are arranged in the pump body The driven shaft has a pair of intermeshing driving gears and driven gears on the two shafts respectively. Floating front side plates and rear side plates are respectively installed on both sides of the driving gear and driven gears. A ceramic layer is provided on the end face of the side plate in contact with a pair of intermeshing driving gears and driven gears and on the two inner hole walls of the front and rear side plates; in the two inner holes of the front side plate facing There are 1 to 4 grooves on the side wall of the liquid suction port of the high-pressure gear water pump, and a water delivery channel connecting the grooves and the liquid discharge port of the high-pressure gear water pump is opened on the front side plate. Channel; 1 to 4 grooves are arranged on the wall facing the liquid suction port of the high-pressure gear water pump in the two inner holes of the rear side plate, and there are communication channels on the rear side plate. The water delivery channel between the groove and the discharge port of the high-pressure gear water pump.

In order to better realize the present invention, two rectangular grooves are provided on the wall of each inner hole facing the liquid suction port side of the high-pressure gear water pump in the two inner holes of the front side plate; Two rectangular grooves are provided on the wall of each of the two inner holes of the rear side plate facing the liquid suction port of the high-pressure gear water pump.

The materials of the pump body, the front end cover and the rear end cover are anti-rust aluminum, so that the high-pressure gear water pump can be used in special environments that are humid or prone to rust.

Nitriding layers are provided on the working surfaces of the pair of mutually meshing driving gears and driven gears and the working surfaces of the driving main shaft and driven shafts.

The nitrided layer is an alloy steel nitrided layer.

The tooth flanks on the non-stressed side of the pair of mutually meshing driving gears and driven gears are tooth flanks that have been trimmed.

An arcuate sealing strip is provided between the front side plate and the front end cover; an arcuate sealing strip is provided between the rear side plate and the rear end cover.

On the end surface where the front side plate is in contact with the front end cover, the front side plate is provided with a water delivery channel connecting the liquid discharge port and the drive spindle on the side facing the drain port of the high-pressure gear water pump and a The water delivery channel connecting the drain port and the driven shaft; on the end face of the rear side plate in contact with the rear end cover, the rear side plate faces the drain port of the high-pressure gear water pump. A water delivery channel connecting the drain port with the drive shaft and a water delivery channel linking the drain port with the driven shaft.

The ceramic layer is a new type of composite ceramic layer, which is formed by embedding nanometer superhard ultrafine (<20nm) ceramic powder in Al ₂ O ₃ .

Advantage and effect of the present invention relative to prior art are:

1. In the inner holes of the front and rear side plates, a rectangular groove is set on the wall facing the liquid suction port of the high-pressure gear water pump to communicate with the high-pressure liquid at the liquid discharge port of the high-pressure gear water pump. Therefore, the high-pressure liquid in the groove The liquid plays a role of radial support and lubrication for the driving shaft and driven shaft, thereby reducing the radial unbalanced force caused by the pressure difference between the suction port and the liquid discharge port of the high-pressure gear water pump, which is equivalent to that of the hydrostatic bearing. Function, it reduces the wear of the bearing, but also reduces the noise, and improves the dynamic characteristics of the high-pressure gear pump when it is working.

2. A nitriding layer is provided on the working surfaces of a pair of intermeshing driving gears and driven gears and the working surfaces of the driving spindle and driven shaft. The nitrided layer is an alloy steel nitrided layer with high surface hardness. , good wear resistance, strong corrosion resistance, and good water capacity; on the end faces of the front and rear side plates in contact with a pair of intermeshing driving gears and driven gears and on the inner hole walls of the front and rear side plates The set ceramic layer can form a water lubricating film in the pure water medium, and has high hardness and good wear resistance and corrosion resistance. The combination of the ceramic layer and the alloy steel nitride layer is an ideal material suitable for pure water medium, so that the high-pressure gear water pump of the present invention has good volumetric efficiency and can effectively reduce leakage.

3. When a pair of intermeshed driving gear and driven gear work, under the action of load, the gear teeth produce bending deformation, which affects the correct meshing characteristics of the involute tooth profile and causes transmission noise. On the side of the force, the edge is repaired at the tooth belly, so that the teeth are basically close to the meshing conditions of the involute tooth profile in the state of bending deformation, so that they can achieve close contact under the force deformation state, reducing The amount of backlash when the two gear teeth mesh, reduces leakage and improves volumetric efficiency.

4. When the high-pressure gear water pump is working, the front side plate and the rear side plate and the two sides of the driving gear and the driven gear are in close contact with each other under the action of high-pressure liquid flow, thus increasing the volume of the high-pressure gear water pump efficiency and reduced leakage.

5. Compared with the existing patented technology, the ceramic layer is in the process of generating the Al ₂ O ₃ ceramic layer, embedded nano-ultrahard and ultra-fine (<20nm) ceramic powder to form a new composite ceramic layer, which is different from the general Al 2 O 3 ceramic layer. _{The 2} O ₃ ceramic layer has relatively high hardness and wear resistance, and the added rare earth elements play an activation effect in the process of promoting the formation of the ceramic layer.

Description of drawings

Fig. 1 is the structural representation of high-pressure gear water pump of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a left view of the front side plate of the high pressure gear water pump in Fig. 1;

Fig. 4 is a partial cross-sectional view of the front side plate of the high-pressure gear water pump in Fig. 1;

Fig. 5 is a left side view of the front side plate of the high-pressure gear water pump of Fig. 1 (with bow-shaped sealing strip);

Fig. 6 is a schematic diagram of a pair of intermeshing driving gears and driven gears of the high-pressure gear water pump in Fig. 1;

Fig. 7 is a schematic diagram of edge trimming at the tooth flank on the non-stressed side of the tooth d in Fig. 6 .

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

The specific structure of the high-pressure gear water pump of the present invention is shown in Figures 1 to 2: the high-pressure gear water pump includes a front cover 2, a pump body 4 and a rear end cover 7, and the pump body 4, the front Made of rusted aluminum material. The front end cover 2, the pump body 4 and the rear end cover 7 form a closed space, and O-rings 3 and 26 are arranged between the pump body 4, the front end cover 2 and the rear end cover 7; the pump body 4 is provided with a drive shaft 1. There is a driving gear 5 on the shaft, and there is a J-shaped skeleton composite sealing ring 15 at the contact between the shaft and the front end cover 2; the driven shaft 14 and the driven gear 27 on the pump body 4 are also provided ; Both sides of driving gear 5 and driven gear 27 are equipped with floating front side plate 13 and rear side plate 6 respectively, and the structure of front side plate 13 and rear side plate 6 is identical; As shown in Figure 5, front end cover 2 A bow-shaped sealing strip 28 is provided between the front side plate 13, and a bow-shaped sealing strip with the same structure as the above is provided between the rear end cover 7 and the rear side plate 6; the J-shaped skeleton composite sealing ring 15 and the O-shaped sealing ring 3 , 26 can prevent the liquid in the pump body from leaking out. As shown in Fig. 5, on the end face of the front side plate 13 in contact with the front end cover 2, on the side area 21 of the front side plate 13 facing the drain port 16 of the high-pressure gear water pump, there is a line connecting the drain port 16 and the drive spindle. 1 and a high-pressure liquid passage 22 connecting the drain port 16 and the driven shaft 14; similarly, on the end face of the rear side plate 6 in contact with the rear end cover 7, at the corresponding position on the rear side plate 6 Two high-pressure liquid passages 22 communicating with the discharge port 16 are also provided. When the high-pressure gear water pump is working, the two end faces of the front side plate 13 and the rear side plate 6 in contact with the driving gear 5 and the driven gear 27 are in close contact with each other under the action of the high-pressure liquid flow. As shown in Figure 1, there is a layer of composite ceramic layers 11 and 10 on the end faces of the front side plate 13 and the rear side plate 6 in contact with the driving gear 5 and the driven gear 27; the outer surfaces of the front side plate 13 and the rear side plate 6 There are one layer of composite ceramic layers 12 and 8 respectively on the top, and one layer of composite ceramic layer 9 is arranged on the two inner hole walls of the front side plate 13 and the rear side plate 6 . A pair of intermeshed driving gear 5 and the working surface of the driven gear 27 and the working surfaces of the driving main shaft 1 and the driven shaft 14 all have one deck alloy steel nitride layer. As shown in Figures 3 to 4, two rectangular grooves 20 are provided on the wall of each inner hole facing the liquid suction port 17 of the high-pressure gear water pump in the two inner holes of the front side plate 13; Two rectangular grooves 20 are provided on the wall of each of the two inner holes of the rear side plate 6 facing the liquid suction port 17 of the high-pressure gear water pump. When the high-pressure gear water pump works, the high-pressure liquid flow flows from the discharge port 16 through the passages 18 and 19 into the rectangular groove 20 . The high-pressure water flows into the rectangular groove 20 to support the driving shaft and the driven shaft, so as to reduce the unbalanced radial force caused by the high outlet pressure, which is equivalent to the function of the hydrostatic bearing, which reduces the bearing stress. Wear, improve the quality of gear transmission, reduce noise.

The high-pressure gear water pump of the present invention works like this: driven by the power source, the main shaft 1 is driven to rotate, and at the same time, the driven shaft 14 is driven to rotate together by a pair of driving gear 5 and driven gear 27 meshing with each other. During the revolution, the sealing volumes of the sealing areas 23 and 24 contained by the two pairs of gear teeth a, b and c, d in Fig. The area 24 changes from small to large, the former causes the pressure of the liquid flow to increase, and the latter causes the pressure of the liquid flow to decrease. The liquid flow port where the pressure increases is the discharge port 16 of the pump (see Figure 2), and the liquid flow port where the pressure decreases is the liquid suction port 17 (see Figure 2).

As shown in Figure 7, in order to improve the meshing quality of the working gear of the high-pressure gear water pump of the present invention, reduce the transmission noise, and improve the dynamic characteristics, the teeth of the driving gear 5 and the driven gear 27 that mesh with each other are bent under load. In the deformed state, edge trimming can be performed on the flank 25 of the non-stressed side of the above-mentioned gear teeth to avoid impact when the two meshing gear teeth are working. At the same time, due to the trimming of the gear teeth, the tooth side clearance of the two-phase meshing gear teeth can be optimized under the influence of thermal deformation, and the optimal clearance value can be selected, thereby reducing the leakage of the tooth side and further Improve the volumetric efficiency of the gear pump and the working pressure of the outlet.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, any changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention, All should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (2)

1. high-pressure gear water pump, comprise front cover, rear end cover and the pump housing, the forward and backward end cap and the pump housing are formed the space of a sealing, in the pump housing, be provided with drive main spindle and driven shaft, on two axles, have a pair of intermeshing driving gear and driven gear respectively, be separately installed with unsteady front side plate and back side panel in the both sides of driving gear and driven gear, on forward and backward side plate and a pair of intermeshing driving gear and end face that driven gear contacts and on two inner hole walls of forward and backward side plate, be equipped with ceramic layer; In two endoporus of described front side plate, on the wall of liquid sucting port one side of described high-pressure gear water pump, be provided with 1～4 groove altogether, on described front side plate, have the water transport channel that is communicated with described groove and described high-pressure gear water pump liquid port; In two endoporus of described back side panel, on the wall of liquid sucting port one side of described high-pressure gear water pump, be provided with 1～4 groove altogether, on described back side panel, have the water transport channel that is communicated with described groove and described high-pressure gear water pump liquid port; It is characterized in that, described a pair of intermeshing driving gear and driven gear only are that the flank of a side of non-stress is the flank of handling through tip relief, and it is to have produced the tip relief processing of carrying out under the diastrophic state at driving gear and driven gear stand under load that described tip relief is handled.

2. according to the described high-pressure gear water pump of claim 1, it is characterized in that described ceramic layer is the novel composite ceramic layer, described novel composite ceramic layer is meant at Al ₂O ₃For embedding the composite ceramic layer that nano ceramic powder forms in the ceramic layer of matrix.

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