WO2020125033A1

WO2020125033A1 - Aluminum alloy pump structure of vacuum pump, and honing tool for machining pump body

Info

Publication number: WO2020125033A1
Application number: PCT/CN2019/100711
Authority: WO
Inventors: 陈鑫
Original assignee: 陈鑫
Priority date: 2018-12-17
Filing date: 2019-08-15
Publication date: 2020-06-25
Also published as: CN109707628A

Abstract

An aluminum alloy pump structure of a vacuum pump, and a honing tool for machining a pump body. The aluminum alloy pump structure comprises a pump stator (1) and a rear pump cover (2) covering an opening end of the pump stator (1). The pump stator (1) and the rear pump cover (2) jointly enclose to form a pump cavity (3). A pump rotor (4) is eccentrically mounted inside the pump cavity (3). The pump stator (1) and the rear pump cover (2) are both made out of an aluminum alloy material. The surface of the pump stator (1) corresponding to the pump cavity (3) and the surface of the rear pump cover (2) are both provided with an abrasion-resistant modified layer (5).

Description

Aluminum alloy pump body structure of vacuum pump and honing head used for processing of the pump body

Technical field

The invention relates to the field of refrigeration maintenance, in particular to an aluminum alloy pump body structure of a vacuum pump that is light in weight, convenient to carry and use, and a honing head used for processing the pump body.

Background technique

Rotary vane vacuum pumps are commonly used for refrigeration maintenance, and the existing pump vane vacuum pump body materials are cast iron, resulting in a large weight, but in many refrigeration maintenance applications, users need to carry the vacuum pump separately, or take the The assembly equipment with vacuum pump is transported to the application site for use, and the heavy-weight vacuum pump body directly causes the user to handle and use difficult, affects the normal use of the customer, and even increases the customer's cost of use.

Summary of the invention

The invention mainly provides an aluminum alloy pump body structure of a vacuum pump with a simple structure, light weight, easy to carry and use, and a honing head used for processing the pump body, which solves the heavy weight of the vacuum pump existing in the prior art , Difficult to carry and use vacuum pumps during refrigeration maintenance, which affects the normal use of customers, and even raises the technical problems of customers.

The above technical problems of the present invention are mainly solved by the following technical solutions: an aluminum alloy pump body structure of a vacuum pump, including a pump stator and a pump back cover mounted on the open end of the pump stator, the pump stator and the pump back cover Combined to form a pump cavity, the pump rotor is eccentrically installed in the pump cavity, the pump stator and the pump back cover are made of aluminum alloy, and the surface of the pump stator and the pump back cover corresponding to the pump cavity are provided with wear-resistant modification Floor. The pump stator and the pump back cover of the vacuum pump body are made of aluminum alloy. Because the density of aluminum alloy is only one third of the density of cast iron, the weight of the vacuum pump is greatly reduced. The aluminum alloy has low hardness and wear resistance. The performance is poor, so by setting a wear-resistant modified layer on the surface of the pump cavity, the wear-resistant modified layer is used to improve the hardness and wear resistance of the pump cavity, while reducing the weight and satisfying the use function, the structure is simple, compared with the traditional cast iron pump body The light weight of the structure is about 35%, which facilitates the user to carry, carry and use, and indirectly reduces the user's cost of use.

Preferably, the wear-resistant modified layer is formed by micro-arc oxidation treatment. Micro-arc oxidation, also known as micro-plasma oxidation, is a combination of electrolyte and corresponding electrical parameters. It is based on the instantaneous high-temperature and high-pressure effect of arc discharge on the surface of aluminum, magnesium, titanium and their alloys. The ceramic membrane layer has the advantages of high surface hardness, good wear resistance, reliable process, simple equipment and convenient operation. For this reason, the wear-resistant modified layer formed by micro-arc oxidation processing has a simple process and reliable surface performance of the pump cavity, which can ensure the operation requirements of the vacuum pump.

Preferably, the wear-resistant modified layer is formed by surface hardening. Surface hardening refers to the hardening of the surface of the part by carburizing, nitriding, hard anodizing, chrome plating, surface quenching and metalizing, etc., but the core of the part still has strong toughness treatment, which can be improved by surface hardening treatment The wear resistance and fatigue resistance of the parts, and since the heart of the parts still has good toughness and strength, it has a good resistance to impact loads. The wear-resistant modified layer formed by surface hardening processing has low processing cost and simple process.

Preferably, the pump rotor is made of aluminum alloy, and the surface of the pump rotor is also provided with a wear-resistant modified layer. In order to further reduce the weight of the pump body, the pump rotor is also changed from the original cast iron material to the aluminum alloy material, and the surface treatment of the rotor forms a wear-resistant modified layer. The wear-resistant modified layer is used to improve the hardness and wear resistance of the pump rotor. At the same time, the function of weight reduction is ensured.

Preferably, the surface of the wear-resistant modified layer is ground by honing. By grinding the wear-resistant modified layer, the roughness of the working surface of the pump body is further reduced, and the sealing performance of the working surface is improved to ensure the performance index of the vacuum pump and the long-term working life requirements.

A honing head for processing an aluminum alloy pump body of a vacuum pump includes a honing seat, and a plurality of longitudinal whetstone positioning grooves are arranged on the outer ring surface of the honing seat, and the whetstones are slidingly connected in the longitudinal whetstone positioning grooves and positioned in the longitudinal whetstones The bottom of the groove is provided with a through hole, and an adjustment pin is slidingly connected in the through hole, and then the adjustment cone rod is inserted into the middle hole of the honing seat, and the cone surface of the adjustment cone rod is abutted on the inner end of the adjustment pin. The lower end surface extends beyond the lower end surface of the honing seat, and a return spring that can push the oilstone to slide downward is provided above the honing seat. When the lower end surface of the whetstone extends beyond the lower end surface of the honing seat, the whetstone on the honing head can be extended to the bottom of the middle hole of the pump stator during processing, so that the whetstone can fully grind the annular surface of the pump stator to meet the pump stator and the pump The matching requirements of the eccentric inscribed of the rotor ensure the use performance of the vacuum pump; by providing a return spring above the honing seat that can push the oil stone to slide downward, the contact between the oil stone and the bottom surface of the hole in the pump stator is elastic, so that both To ensure the complete grinding process of the pump stator annular surface, and to avoid rigid contact between the oil stone and the bottom surface of the pump stator mid-hole during processing, thereby destroying the bottom surface of the pump stator mid-hole and the honing head, which not only guarantees the grinding quality of the pump stator's inner cavity, but also Extend the service life of the honing head.

Preferably, a fixing block is provided on the inner end of the whetstone, opening grooves are respectively formed on the upper and lower end surfaces of the fixing block, and a positioning spring that can pull the fixing block to slide inward is elastically fixed in the opening groove. The inner end of the whetstone is fixed to the fixed block, that is, the whetstone is slidingly connected to the longitudinal whetstone positioning groove through the fixed block, saving the oilstone material and the manufacturing cost of the nodule; opening grooves are provided on the upper and lower end surfaces of the fixed block to fix the positioning spring. The positioning spring pulls the fixed block and the whetstone to clamp inwards. During processing, the whetstone and the fixed block expand outwards against the resistance of the positioning spring under the centrifugal force to grind the middle hole, thereby reducing the circumference of the honing head in the non-working state The size is convenient for it to enter the middle hole of the pump stator for processing.

Preferably, a middle portion of the upper end surface of the honing base extends upward to form a positioning ring column, an adjusting nut is screwed on the positioning ring column, and a return spring is sleeved on the positioning ring column between the adjusting nut and the honing base. The return spring is positioned by adjusting the upper end surface of the nut and the honing seat, with a simple structure and easy installation and adjustment.

More preferably, a retaining ring is sleeved on the corresponding positioning ring column under the adjusting nut, and one end of the return spring is pressed against the retaining ring, and the other end is pressed against the honing seat. By setting a retaining ring between the return spring and the adjusting nut, it is convenient for the accurate positioning of the return spring.

More preferably, the upper end of the adjusting taper rod is fixed in the middle hole of the positioning ring column by a positioning pin, both ends of the positioning pin extend outside the positioning ring column, and a positioning ring between the positioning pin and the upper end surface of the honing seat An adjustment spring is set on the column. By setting the positioning pin, and an adjustment spring between the positioning pin and the upper end surface of the honing seat, the adjustment spring can be used to ensure the downward pressure of the positioning ring column and prevent the positioning ring column from being loosened.

Therefore, the aluminum alloy pump body structure of the vacuum pump of the present invention and the honing head used for the processing of the pump body have the following advantages: the vacuum pump body accounts for about 50% of the total weight of the vacuum pump, and the density of the aluminum alloy is only three One part, so the total weight of the vacuum pump is 65% of the weight of the original casting pump body by using an aluminum alloy pump body, which greatly facilitates the carrying and use of customers; the resistance of the pump cavity is formed by micro-arc oxidation or surface hardening processing Grinding the modified layer to ensure the hardness and wear resistance of the pump cavity through the wear-resistant modified layer, which meets the normal use function of the vacuum pump while reducing weight; by grinding the surface of the wear-resistant modified layer, the working surface is further reduced The roughness improves the sealing of the working surface, ensuring the performance index of the vacuum pump and the long-term working life requirements.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a structural schematic diagram of the aluminum alloy pump body structure of the vacuum pump of the present invention;

2 is a schematic structural view of a honing head for processing an aluminum alloy pump body of a vacuum pump according to the present invention;

FIG. 3 is a lateral cross-sectional view shown in FIG. 2.

detailed description:

The technical solutions of the present invention will be further specifically described below through the embodiments and the accompanying drawings.

Example 1:

As shown in FIG. 1, a pump stator 1 including a vacuum pump and a pump back cover 2 mounted on the open end of the pump stator 1 are enclosed by the pump stator 1 and the pump back cover 2 to form a pump cavity 3. There is a pump rotor 4, the pump rotor 4 is tangent to the inner ring surface of the pump stator 1, wherein the pump stator 1, the pump back cover 2 and the pump rotor 4 are made of aluminum alloy, and the corresponding pump in the surface of the pump rotor 4 and the pump cavity 3 The surfaces of the stator 1 and the back cover 2 of the pump are hardened to form a wear-resistant modified layer 5 through surface hardening.

Example 2:

The surface of the pump rotor 4, the corresponding surface of the pump stator 1 and the back cover 2 of the pump cavity 3 are formed by micro-arc oxidation treatment to form a wear-resistant modified layer 5, because the outer ring surface of the pump rotor 4 and the pump stator 1 during the operation of the vacuum pump Toroidal tangent, in order to reduce the surface roughness and improve the sealing of the tangent working face, the inner ring surface of the pump stator 1 with the wear-resistant modified layer 5 and the outer ring surface of the pump rotor 4 are ground by honing. The rest is exactly the same as in Example 1.

As shown in FIGS. 2 and 3, a honing head for processing an aluminum alloy pump body of a vacuum pump includes an annular honing seat 6, and four longitudinal whetstone positioning grooves 7 are evenly distributed on the outer ring surface of the honing seat 6 , The longitudinal whetstone positioning groove 7 communicates with the upper and lower end surfaces of the honing seat 6, and the fixing block 12 is slidingly connected in the longitudinal whetstone positioning groove 7, and both ends of the fixing block 12 are flush with the upper and lower end surfaces of the honing seat 6 and fixed The outer end of the block 12 is fixed with an oilstone 8 by bonding. The two ends of the oilstone 8 extend beyond the upper and lower end surfaces of the fixed block 12, and the oilstone 8 extends radially to the outside of the longitudinal oilstone positioning groove 7 above and below the fixed block 12 The end surfaces are respectively provided with opening grooves 13, and the four opening grooves 13 corresponding to the upper end surface of the fixing block 12 are sheathed with a positioning spring 14, and the four opening grooves 13 corresponding to the lower end surface of the securing block 12 are also sheathed with one The positioning spring 14 pulls the fixing block 12 through the two positioning springs 14 to slide inward along the longitudinal oilstone positioning groove 7. At the bottom of the longitudinal oilstone positioning groove 7, two through holes 9 are opened in the radial direction. The through holes 9 are matched with sliding inserts and adjustment pins 10, and the taper rod 11 is inserted and adjusted in the middle hole of the honing seat 6. The adjustment cone rod 11 is provided with two cones corresponding to the upper and lower adjustment pins 10, the cone body is coaxial with the adjustment cone rod 11 and the lower diameter end is downward, and the cone surface of the adjustment cone rod 11 is abutted on the corresponding On the inner end of the adjusting pin 10, the middle of the upper end surface of the honing base 6 extends coaxially upward to form a positioning ring column 15, the upper end of the adjusting cone rod 11 slides horizontally to the positioning pin 19, and the adjusting cone rod 11 is fixed by the positioning pin 19 In the middle hole of the positioning ring column 15, and both ends of the positioning pin 19 extend outside the positioning ring column 15, an adjusting spring 20 is sleeved on the positioning ring column 15 between the positioning pin 19 and the upper end surface of the honing seat 6. A retaining ring 18 is sleeved on the corresponding positioning ring column 15 above the pin 19, and the corresponding positioning ring column 15 above the retaining ring 18 is screwed up and then the adjusting nut 17 is fitted. The adjustment spring 20 between the retaining ring 18 and the honing seat 6 is sleeved The return spring 16 which pushes the oilstone 8 to slide downward. One end of the return spring 16 abuts on the lower surface of the retaining ring 18 and the other end abuts on the honing seat 6.

When grinding the inner ring surface of the pump stator 1, the honing head is first sent down into the middle hole of the pump stator 1, so that the end face of the whetstone 8 corresponding to the lower end surface of the honing head abuts on the bottom surface of the middle hole of the pump stator 1, and honing When the head rotates, the oil stone 8 slides outward against the resistance of the positioning spring 14 under the action of centrifugal force and grinds the inner ring surface of the pump stator 1.

The specific embodiments described herein are merely examples of the concept of the present invention. A person skilled in the art to which the present invention belongs can make various modifications or additions to the described specific embodiments or substitute in a similar manner, but it will not deviate from the spirit of the present invention or go beyond the definition of the appended claims Scope.

Claims

An aluminum alloy pump body structure of a vacuum pump includes a pump stator (1) and a pump back cover (2) mounted on the open end of the pump stator (1). The pump stator (1) and the pump back cover (2) are formed together The pump cavity (3) is eccentrically equipped with a pump rotor (4) in the pump cavity (3), characterized in that the pump stator (1) and the pump back cover (2) are made of aluminum alloy and are The surfaces of the pump stator (1) and the pump back cover (2) corresponding to the cavity (3) are provided with wear-resistant modified layers (5).
The aluminum alloy pump body structure of the vacuum pump according to claim 1, wherein the wear-resistant modified layer (5) is formed by micro-arc oxidation treatment.
The aluminum alloy pump body structure of the vacuum pump according to claim 1, wherein the wear-resistant modified layer (5) is formed by surface hardening.
The aluminum alloy pump body structure of the vacuum pump according to claim 1, wherein the pump rotor (4) is made of aluminum alloy, and the surface of the pump rotor (4) is also provided with a wear-resistant modified layer (5) .
The aluminum alloy pump body structure of the vacuum pump according to claim 1, wherein the surface of the wear-resistant modified layer (5) is ground by honing.
A honing head for processing an aluminum alloy pump body of a vacuum pump includes a honing seat (6), and there are a plurality of longitudinal whetstone positioning grooves (7) on the outer ring surface of the honing seat (6). 7) The oil stone (8) is slidingly connected inside, and a through hole (9) is provided at the bottom of the longitudinal oil stone positioning groove (7). The adjustment pin (10) is slidingly connected in the through hole (9), and the honing seat (6) Then insert the middle hole of the adjustment cone rod (11), and the cone surface of the adjustment cone rod (11) abuts on the inner end of the adjustment pin (10), characterized in that the lower end surface of the whetstone (8) extends to A return spring (16) which can push the oilstone (8) to slide downward is provided outside the lower end surface of the honing seat (6), and above the honing seat (6).
The honing head for processing an aluminum alloy pump body for a vacuum pump according to claim 6, characterized in that: a fixing block (12) is provided on the inner end of the whetstone (8) above the fixing block (12) An opening groove (13) is respectively opened on the lower end surface, and a positioning spring (14) capable of pulling the fixing block (12) to slide inward is elastically fixed in the opening groove (13).
The honing head for processing an aluminum alloy pump body for a vacuum pump according to claim 6, characterized in that: a middle portion of the upper end surface of the honing seat (6) extends upward to form a positioning ring column (15), and the positioning ring column (15) 15) The adjusting nut (17) is screwed on the top, and the return spring (16) is sleeved on the positioning ring column (15) between the adjusting nut (17) and the honing seat (6).
The honing head for processing an aluminum alloy pump body for a vacuum pump according to claim 8, characterized in that a retaining ring (18) is sleeved on the corresponding positioning ring column (15) under the adjusting nut (17), One end of the return spring (16) contacts the retaining ring (18), and the other end contacts the honing seat (6).
The honing head for machining an aluminum alloy pump body for a vacuum pump according to claim 8, characterized in that: the upper end of the adjusting cone (11) is fixed to the positioning ring column (15) by a positioning pin (19) In the middle hole, both ends of the positioning pin (19) extend outside the positioning ring column (15), and an adjusting spring is sleeved on the positioning ring column (15) between the positioning pin (19) and the upper end surface of the honing seat (6) (20).