CN217176877U

CN217176877U - Novel LCP full injection molding rotor assembly

Info

Publication number: CN217176877U
Application number: CN202221090621.XU
Authority: CN
Inventors: 邢子义; 季高录; 徐丙振
Original assignee: Yantai Dongde Industrial Co Ltd
Current assignee: Yantai Dongde Industrial Co Ltd
Priority date: 2022-05-08
Filing date: 2022-05-08
Publication date: 2022-08-12
Anticipated expiration: 2032-05-08

Abstract

The utility model provides a novel LCP rotor assembly that moulds plastics entirely, includes rotor body and rotor shaft, and rotor body adopts LCP engineering plastics to make, the rotor shaft adopts the metal to make, rotor body directly moulds plastics epaxial in rotor shaft with rotor shaft in an organic whole, be equipped with the spacing key between rotor shaft and the rotor body, the spacing key is used for preventing rotor body from taking place axial and radial displacement. On one hand, LCP engineering plastics are high in flowability, low in injection temperature and mold temperature and more suitable for injection molding, splines are added on the rotor shaft, the rotor body is directly injected on the rotor shaft, and finally the rotor body is subjected to finish machining, so that the position degrees of the rotor shaft and the rotor body are ensured, the product percent of pass is higher, the processing technology is simpler than that of the traditional aluminum alloy rotor, and the manufacturing cost is lower; on the other hand, compared with the aluminum alloy material, the LCP engineering plastic has the advantages of low density, light weight, low material cost and small thermal expansion coefficient, is more suitable for the operation of the hydrogen circulating pump at low temperature and high temperature, and prolongs the service life of the product.

Description

Novel LCP full injection molding rotor assembly

The technical field is as follows:

the utility model relates to a novel LCP rotor assembly that moulds plastics entirely.

Background art:

the fuel cell generates electric energy through electrochemical reaction between combustible substances (hydrogen) and oxygen in air, wherein after the fuel cell reaction, discharged gas contains a large amount of hydrogen, and if the hydrogen is directly discharged into the atmosphere, the hydrogen is on one hand wasted energy, on the other hand pollutes the environment, and on the other hand, the hydrogen is flammable and combustible, so that danger is generated. Therefore, it is necessary to recover and reuse such hydrogen. At present, these hydrogen-containing mixed gases are generally recycled to the fuel cell by a hydrogen circulation pump for recycling.

Hydrogen circulation pumps are of many types, wherein, in roots-type hydrogen circulation pumps, a male rotor and a female rotor are provided in the supercharger, which are now generally made of aluminum alloy, which mainly has the following disadvantages:

(1) in the process of pressurizing the hydrogen-containing mixed gas, the aluminum alloy material is directly contacted with the hydrogen-containing mixed gas and is easily corroded by hydrogen and water vapor, so that the gap error is increased, and the working stability and the service life are influenced;

(2) the original rotor is finished by adopting 7075 aluminum alloy rough and finish milling, not only has heavy weight, but also is assembled after being assembled with a rotor shaft, deviation is easy to exist in the assembling process, and the repair frequency is high, so that the rotor has high material cost and manufacturing cost;

(3) the process of spraying the anticorrosive coating on the aluminum alloy rotor appears in the market later, but on the first hand, the film formed by one-time spraying is very thin, the film required by the formation needs to be sprayed for multiple times, multiple curing is carried out, the process is complex, the cost is high, in addition, the spraying coating is usually made of Teflon or polytetrafluoroethylene materials, the thermal expansion coefficient of the materials is large, and under the high-temperature condition, the coating is separated from the rotor, so that the clearance of the pump is reduced, and the risks of abrasion and blocking are generated; on the basis of machining precision, uneven errors of spraying thickness are increased for the spraying layer, and outline precision of a finished product is reduced, so that meshing precision of the whole machine is reduced, and consistency of product performance is affected; in the third aspect, the cost and the labor hour waste of secondary processing exist in the spraying layer, in addition, the poor bonding force of the plastic coating and the substrate has the problem that the plastic coating is separated from the plastic coating after use, because the mold ejector rod is needed to eject the workpiece during the plastic coating rotor processing, the plastic coating rotor end face has 3 holes, on one hand, air can enter between the plastic coating and the insert through the 3 holes, the bonding force is more prone to be poor, in addition, the exposed aluminum surface of the 3 holes of the insert is prone to corrosion, the processing qualification rate and the influence performance are influenced, and hydrogen and water vapor can be caused to enter gaps between the plastic coating and the substrate to corrode.

In summary, in the field of hydrogen circulation pumps, the above problems of the male rotor and the female rotor have become a technical problem to be solved urgently in the industry.

The utility model has the following contents:

the utility model discloses a remedy prior art not enough, provide a novel LCP rotor assembly that moulds plastics entirely, solved the poor problem of aluminium alloy rotor anti-corrosion ability in the past, solved aluminium alloy rotor weight in the past big, the expense high, the troublesome problem of assembly, solved spraying rotor technology in the past complicated, with high costs, the coating easily drops and produces wearing and tearing, the dead problem of card.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:

the utility model provides a novel LCP rotor assembly that moulds plastics entirely, includes rotor body and rotor shaft, rotor body adopts LCP engineering plastics to make, the rotor shaft adopts the metal to make, rotor body directly moulds plastics and rotor shaft is connected in an organic whole with rotor shaft on the rotor shaft, be equipped with spacing key between rotor shaft and the rotor body, spacing key is used for preventing rotor body from taking place axial and radial displacement.

The limiting key and the rotor shaft are integrally processed and molded.

The limiting key comprises a spline.

The number of the limiting keys is two, and the two limiting keys are arranged on the rotor shaft at intervals.

The number of the blades of the rotor body is 2-6.

The rotor shaft is made of aluminum alloy or stainless steel or 45 steel.

And lightening holes are formed in the blades of the rotor body.

The utility model adopts the above technical scheme, have following advantage:

the LCP engineering plastics are adopted to manufacture the rotor body, the rotor body is directly injected on the rotor shaft and connected with the rotor shaft into a whole, the secondary processing cost is saved, the assembly error is reduced, and the processing precision is improved; on the other hand, compared with the aluminum alloy material, the LCP engineering plastic has the advantages of low density, light weight, low material cost and small thermal expansion coefficient, is more suitable for the operation of the hydrogen circulating pump at low temperature and high temperature, and prolongs the service life of the product.

Description of the drawings:

fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic sectional view of the present invention.

Fig. 3 is a schematic perspective view of the rotor shaft of the present invention.

In the figure, the rotor comprises a rotor body 1, a rotor shaft 2, a rotor shaft 3, a limit key 4 and a lightening hole.

The specific implementation mode is as follows:

in order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.

As shown in fig. 1-3, a novel LCP rotor assembly that moulds plastics entirely, including rotor body 1 and rotor shaft 2, rotor body 1 adopts LCP engineering plastics to make, rotor shaft 2 adopts the metal to make, rotor body 1 directly moulds plastics on rotor shaft 2 with rotor shaft connected in an organic whole, be equipped with spacing key 3 between rotor shaft 2 and the rotor body 1, spacing key 3 is used for preventing that rotor body 1 from taking place axial and radial displacement. The flow direction and the transverse linear expansion coefficient of the LCP engineering plastic are both less than 2.36 x 10-5 of the aluminum alloy 7075T 651D; on one hand, LCP engineering plastics are high in flowability, the injection temperature and the mold temperature are low, the injection temperature is 340 ℃, the mold temperature is 100 ℃, the LCP engineering plastics are more suitable for injection molding, a rotor body is directly injected onto a rotor shaft, the annealing temperature of the rotor shaft is above 400 ℃, shaft annealing cannot be caused, the position degrees of the rotor shaft and the rotor body are ensured, the product percent of pass is higher, the processing technology is simpler than that of the traditional aluminum alloy rotor, and the manufacturing cost is lower; on the other hand, compared with the aluminum alloy material, the LCP engineering plastic has the advantages of low density, light weight, low material cost and small thermal expansion coefficient, is more suitable for the operation of the hydrogen circulating pump at low temperature and high temperature, and prolongs the service life of the product.

The limiting key 3 and the rotor shaft 2 are integrally machined and formed, and the limiting key can be directly machined on the rotor shaft through a machine tool.

The limiting key 3 comprises a spline, and the multi-tooth shape of the spline can enhance the radial binding force between the rotor shaft 2 and the rotor body 1, so that the radial displacement of the rotor body 1 is effectively avoided.

The number of the limiting keys 3 is two, and the two limiting keys 3 are arranged on the rotor shaft 2 at intervals, so that the axial limiting effect on the rotor body 1 can be enhanced, and the axial displacement of the rotor body 1 is avoided.

The number of the blades of the rotor body 1 is 2-6.

The rotor shaft 2 is made of aluminum alloy or stainless steel or 45 steel.

Lightening holes 4 are formed in the blades of the rotor body 1 to lighten the weight.

During production and processing, firstly, rough machining is carried out on the rotor shaft 2, splines are processed on the rotor shaft 2, then the rotor shaft 2 is directly injected with the rotor body 1 corresponding to the spline position, after the rotor body 1 is cooled and shaped for a period of time, finish machining is carried out on the rotor shaft 2, finally, finish machining is carried out on the rotor body 1, the required precision requirement is met, and a rotor assembly is formed.

The above-mentioned embodiment can not be regarded as right the utility model discloses the restriction of scope, to the technical person in this technical field, it is right the utility model discloses any alternative improvement or transform that the embodiment made all fall within the scope of protection of the utility model.

The parts of the present invention not described in detail are the known techniques of those skilled in the art.

Claims

1. The utility model provides a novel LCP rotor assembly that moulds plastics entirely which characterized in that: including rotor body and rotor shaft, rotor body adopts LCP engineering plastics to make, rotor shaft adopts the metal to make, rotor body directly moulds plastics and is connected in an organic whole with rotor shaft on rotor shaft, be equipped with spacing key between rotor shaft and the rotor body, spacing key is used for preventing that rotor body from taking place axial and radial displacement.

2. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: the limiting key and the rotor shaft are integrally processed and molded.

3. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: the limiting key comprises a spline.

4. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: the number of the limiting keys is two, and the two limiting keys are arranged on the rotor shaft at intervals.

5. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: the number of the blades of the rotor body is 2-6.

6. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: the rotor shaft is made of aluminum alloy or stainless steel or 45 steel.

7. The novel LCP full injection rotor assembly as claimed in claim 1, wherein: and lightening holes are formed in the blades of the rotor body.