CN113958489B

CN113958489B - Vacuum pump

Info

Publication number: CN113958489B
Application number: CN202010707680.6A
Authority: CN
Inventors: 周晓东; 许锦潮; 潘毅广; 鞠晓晨
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2024-02-27
Anticipated expiration: 2040-07-21
Also published as: CN113958489A

Abstract

The invention relates to the field of vacuum pump structural design, and discloses a refrigerator, which comprises a low-temperature storage room, a door body for opening or closing the storage room, a vacuum pump, a vacuum tube and a vacuum box, wherein the vacuum pump is communicated with the vacuum box through the vacuum tube, and the vacuum pump comprises: the invention relates to a motor, a pump body and a motor shaft positioning device, wherein the motor is used as a power source, an eccentric wheel is connected to the motor shaft, the eccentric wheel rotates to drive an internal diaphragm to do reciprocating motion, so that continuous air suction-exhaust circulation is realized, and the pump body is directly communicated with the motor, so that physical complete isolation cannot be realized, and the vacuum pressure in the pump body can influence the stability of the rotation motion of the motor, thereby generating vibration.

Description

Vacuum pump

Technical Field

The invention relates to the field of vacuum pump structural design, in particular to a refrigerator.

Background

In the fresh-keeping technology of the refrigerator, oxygen is closely related to the oxidation effect and the respiration effect of foods in the refrigerator, the slower the respiration of the foods, the lower the oxidation effect, the longer the fresh-keeping time, the oxygen content in a storage space is reduced, the obvious effect on the fresh-keeping of the foods is realized, therefore, the refrigerator with a vacuum fresh-keeping function becomes more and more mainstream, the vacuumizing element of the existing vacuum fresh-keeping refrigerator mostly adopts a diaphragm vacuum pump, the advantages of long service life, PWM speed regulation, overheat overload protection and the like are realized, the vacuum fresh-keeping refrigerator is suitable for occasions requiring long-time continuous operation, the volume is small, the weight is light, the carrying and the installation are convenient, the diaphragm vacuum pump has the function of simply adopting a motor as power, the direct current motor rotates at a high speed to drive the piston of a pump body to reciprocate, the circulation of continuous air suction and exhaust is realized, and the time domain analysis is carried out on the data acquisition of the operating frequency of the vacuum pump, the existing diaphragm vacuum pump still has certain defects, and in the process of vacuumizing, the pump body and the motor are directly communicated by the driving mechanism, so that physical complete isolation cannot be realized, therefore, the terminal of the motor and the vacuum cavity of the pump body are in the same pressure environment (positive pressure or negative pressure), the pressure in the vacuum cavity can influence the rotation movement of the motor, and therefore, when the vacuum degree reaches a certain value, the vibration of the vacuum pump begins to increase, certain noise is correspondingly generated, that is, under the condition of enough pressure, the vacuum pump enables the assembly position of the motor to displace, so that the running balance state of the motor is destroyed, the vibration and the noise rapidly rise, the diaphragm vacuum pump is arranged on a vacuumizing refrigerator, and when the refrigerator performs vacuumizing operation, certain noise can be generated, affecting the user experience.

Disclosure of Invention

In some embodiments of the application, a vacuum pump for refrigerator is provided, it includes motor, pump body and motor shaft positioner, direct intercommunication between pump body and the motor utilizes the motor as the power supply, drives the pump body and realizes the evacuation, carries out axial control spacing to the motor shaft through motor shaft positioner, has solved the motor operation in-process because the pump body pressure effect makes the assembled position of motor itself take place the displacement, and the running balance state of motor shaft is destroyed, thereby vibration and the noise problem that arouses.

According to the embodiment of the application, the fixing mode of the motor shaft of the vacuum pump is improved, the motor shaft positioning device is arranged at the non-power output end of the motor shaft to play a role in limiting the axial direction of the motor shaft, and the limiting force which is the same as the vacuum pressure of the pump body is generated, so that the balance of the motor shaft is prevented from being damaged in the working process of vacuumizing the pump body, and vibration and noise in the working process of the vacuum pump are reduced.

In some embodiments of the present application, there is provided a refrigerator including: a low-temperature storage chamber to form a low-temperature storage space; a door body for opening or closing the low-temperature storage chamber; the bearing frame is arranged on the door body; the refrigerator further includes: the vacuum box is detachably arranged on the bearing frame to form a vacuum storage space; one end of the vacuum tube is detachably communicated with the vacuum box and used for guiding air in the vacuum box to flow out; the vacuum pump is arranged in the door body, is communicated with the other end of the vacuum tube and is used for pumping air in the vacuum box.

In some embodiments of the present application, the vacuum box includes the lid, the lid detain in the vacuum box is in order to form sealing environment, be provided with sealing interface, relief valve and hasp on the vacuum box lid, sealing interface is used for detachable sealed intercommunication the vacuum tube, the relief valve sets up in the sealing interface, be used for blocking or communicate gaseous and external gas in the testing box, the hasp is used for with the lid locking is in on the vacuum box.

In some embodiments of the present application, there is provided a vacuum pump for a refrigerator, including: the motor comprises a motor shell and a motor shaft penetrating through the motor shell, one end of the motor shaft extends out of the motor shell and is used for being connected with external equipment to serve as a power output end, the other end of the motor shaft is sleeved with a bearing serving as a non-power output end, the bearing is fixed on the motor shell, and the motor is used for providing power for the vacuum pump; the pump body comprises a pump shell and a vacuumizing element, wherein the vacuumizing element is arranged in the pump shell, the pump shell is connected with the motor shell, and the vacuumizing element is connected with the motor shaft; and the motor shaft positioning device is arranged on one side of the motor shell, is in contact connection with the non-power output end of the motor shaft and is used for axially limiting and fixing the motor shaft.

In some embodiments of the present application, the pump body is a diaphragm vacuum pump, and the vacuumizing element includes: the eccentric wheel is arranged inside the pump body, and the end part of the eccentric wheel is rotatably supported on the pump shell; the eccentric device is connected with the eccentric wheel and drives the eccentric wheel to work; the eccentric device is connected with the diaphragm air bag sheet; the eccentric wheel is connected to the motor shaft, the motor shaft drives the eccentric wheel to perform eccentric motion, the eccentric device performs reciprocating motion along the horizontal direction orthogonal to the axis of the eccentric wheel, and the eccentric device drives the diaphragm air bag sheet to perform reciprocating motion.

In some embodiments of the present application, the pump body further includes a first pump cavity and a second pump cavity, the volumes of the first pump cavity and the second pump cavity are enlarged or reduced by the action of the diaphragm air bag sheet, the first pump cavity is communicated with an exhaust port, the second pump cavity is communicated with an exhaust port, and the eccentric device drives the diaphragm air bag sheet to reciprocate, so that air in the first pump cavity and the second pump cavity is compressed or stretched, and circulation of continuous air suction and air exhaust is realized.

In some embodiments of the present application, the motor shaft positioning device is configured as a magnetic assembly, the magnetic assembly includes a protective housing and a permanent magnet, the permanent magnet is disposed on one side of the motor shaft sleeve on which the bearing is disposed, the motor shaft is axially limited, and the protective housing cover is disposed outside the permanent magnet to protect the permanent magnet.

In some embodiments of the present application, a groove is disposed on the permanent magnet, and the groove is disposed corresponding to the motor shaft.

In some embodiments of the present application, the motor shaft positioning device is set to the shell fragment subassembly, the shell fragment subassembly includes link and spring leaf, the link is fixed on the shell of motor, just the link sets up one side of motor shaft, spring leaf one end with the link is connected, the spring leaf other end with the motor shaft contact is connected, is right the motor shaft carries out the axial spacing.

In some embodiments of the present application, the spring piece is provided with a circular groove, and the circular groove corresponds to the motor shaft, and a graphite sheet is disposed in the circular groove.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a door body structure diagram of a refrigerator according to an embodiment;

FIG. 2 is a block diagram of a vacuum box according to an embodiment;

FIG. 3 is one of the block diagrams of a vacuum pump according to an embodiment;

FIG. 4 is one of the block diagrams of a vacuum pump according to an embodiment;

FIG. 5 is one of the installation schematic diagrams of the motor shaft positioning device according to the first embodiment;

FIG. 6 is one of the installation schematic diagrams of the motor shaft positioning device according to the first embodiment;

FIG. 7 is one of the installation schematic diagrams of the motor shaft positioning device according to the second embodiment;

FIG. 8 is one of the installation schematic diagrams of the motor shaft positioning device according to the second embodiment;

fig. 9 is a sectional view showing an internal structure of a vacuum pump according to an embodiment.

Reference numerals:

100. a door body; 101. a bearing frame; 200. a vacuum box; 201. a vacuum box cover; 202. sealing the interface; 203. locking; 300. an air suction joint; 400. a vacuum tube; 500. a vacuum pump; 510. a motor housing; 511. a motor shaft; 512. a bearing; 513. a motor magnet; 520. a pump housing; 521. an eccentric wheel; 522. an eccentric device; 523. a membrane balloon sheet; 524. a check valve; 525. a first pump chamber; 526. an air inlet; 527. a second pump chamber; 528. an exhaust port; 530. a motor shaft positioning device; 5311. a protective shell; 5312. a permanent magnet; 5321. a connecting frame; 5322. a spring piece; 600. and (5) fixing clips.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

According to some embodiments of the present application, as shown in fig. 1 and 2, a refrigerator includes: the vacuum box comprises a low-temperature storage room, a door body 100, a bearing frame 101, a vacuum box 200, a vacuum tube 400 and a vacuum pump 500, wherein the low-temperature storage room is a box body structure with one end open, the low-temperature storage room is used for forming a low-temperature storage space, the door body 100 is arranged at the opening of the low-temperature storage room and is used for opening or closing the low-temperature storage room, when the door body 100 is closed, the low-temperature storage room is in a closed state, the bearing frame 101 is arranged on the door body 100, when the door body 100 is closed, the bearing frame 101 enters the interior of the low-temperature storage room, and the vacuum box 200 is placed on the bearing frame 101. The vacuum box 200 comprises a vacuum box cover 201, a vacuum box cover 201 is arranged on the vacuum box 200 in a sealing mode to form a vacuum sealing storage space, a sealing interface 202, a pressure release valve and a lock catch 203 are arranged on the vacuum box cover 201, the pressure release valve is arranged in the sealing interface 202 and used for blocking or communicating gas in the vacuum box 200 with external gas, the pressure release valve is a one-way valve, when the sealing interface 202 is sucked in, the pressure release valve is opened to suck air in the vacuum box 200 out, when the suction is stopped, the pressure release valve is naturally closed to enable the vacuum box 200 to be completely sealed, the lock catch 203 is used for locking the box cover on the vacuum box 200, in one embodiment of the application, a claw is arranged on the vacuum box 200, the claw is connected with the lock catch 203 in a matched mode to enable the vacuum box cover 201 to be buckled on the vacuum box 200, in one embodiment of the application, a vacuum pipe 400 is detachably communicated with the vacuum box 200 to control the suction connector 300, the connection position of the vacuum pipe 400 and the sealing connector is provided with a fixing clip 600, the suction connector 300 is fixed on the vacuum box 100 through the fixing clip 600, the suction connector 300 is matched with the sealing interface 202 and the sealing connector 202 is in a sealing connection, and the suction connector 300 is detachably communicated with the sealing connector 300.

It should be noted that, the whole process of vacuumizing the vacuum box 200 is to start the vacuum pump 500, perform the vacuumizing operation on the vacuum box 200 through the vacuum tube 400, and after the vacuumizing operation is finished, the vacuum pump 500 stops running, and the vacuum box 200 is in a negative pressure state, at this time, the vacuum tube 400 is pulled out from the vacuum box 200, and the vacuum box 200 is taken out, so that the vacuum box 200 is convenient to carry.

As shown in fig. 2, the vacuum box 200 comprises a vacuum box cover 201, a vacuum box cover 201 is sealed and arranged on the vacuum box 200 to form a vacuum airtight storage space, a sealing interface 202, a pressure relief valve and a lock catch 203 are arranged on the vacuum box cover 201, the pressure relief valve is arranged in the sealing interface 202 and is used for blocking or communicating gas in the test box with external gas, wherein the pressure relief valve is a one-way valve, when the sealing interface 202 is sucked in, the pressure relief valve is opened under pressure to suck air in the vacuum box 200 out, when the suction is stopped, the pressure relief valve is naturally closed to enable the vacuum box 200 to be completely sealed, and the lock catch 203 is used for locking the box cover on the vacuum box 200.

In a specific embodiment of the application, a claw is arranged on a vacuum box 200, the claw is matched and connected with a lock catch 203 to fasten a sealing cover of the vacuum box 200 to the vacuum box 200, a vacuum pipe 400 is detachably communicated with the vacuum box 200 to control the extraction and the maintenance of vacuum in the vacuum box 200, a vacuum pipe 400 is communicated between a vacuum pump 500 and the vacuum box 200, the vacuum pipe 400 is fixed on a door body 100 through a fixing clamp 600, the vacuum pipe 400 is matched with a sealing interface 202 and is in sealing connection, one end of the vacuum pipe 400 is inserted into the sealing interface 202, and the sealing interface 202 is detachably communicated with the vacuum pipe 400.

In addition, it should be noted that, the vacuum box 200 is designed to be convenient for putting in and taking out food to be preserved, the vacuum box cover 201 is provided with a pressure release valve for conveniently opening the vacuum box cover 201, when the vacuum box 200 is in a vacuum state and the vacuum box cover 201 needs to be opened, the pressure release valve can be manually pulled out for opening, external air rapidly enters the vacuum box 200 through the pressure release valve, the air pressure in the vacuum box 200 is balanced with the atmospheric pressure, and the vacuum box 200 can be opened by disengaging the lock catch 203.

According to some embodiments of the present application, a vacuum pump 500 as shown in fig. 3, 4 and 9, includes: motor, pump body and motor shaft 511 positioner, the motor includes: the motor casing 510 and motor shaft 511, motor shaft 511 wears to locate the inside cavity of motor casing 510, motor shaft 511 one end stretches out motor casing 510 for connect external equipment as the power take off end, the motor shaft 511 other end is equipped with bearing 512 as the unpowered output end cover, bearing 512 is fixed on motor casing 510, the motor is used for providing power for vacuum pump 500, the pump body includes pump case 520, the evacuating element, first pump chamber 525 and second pump chamber 527, evacuating element sets up in the inside of pump case 520, pump case 520 is connected in motor casing 510, and evacuating element connects in motor shaft 511, evacuating element includes: the eccentric wheel 521, the eccentric device 522 and the diaphragm air bag piece 523, wherein the eccentric wheel 521 is arranged in the pump body, the end part of the eccentric wheel 521 is rotatably supported in the pump shell 520, the eccentric device 522 is connected with the eccentric wheel 521, the eccentric wheel 521 is rotated to drive the eccentric device 522 to work, the eccentric device 522 is connected with the diaphragm air bag piece 523, the eccentric wheel 521 is connected on a motor shaft 511, the motor shaft 511 drives the eccentric wheel 521 to eccentrically move, the eccentric device 522 reciprocates along the horizontal direction orthogonal to the axis of the eccentric wheel 521, and the eccentric device 522 drives the diaphragm air bag piece 523 in the pump body to reciprocate; the volumes of the first pump cavity 525 and the second pump cavity 527 are enlarged or reduced through the action of the diaphragm air bag piece 523, the first pump cavity 525 is communicated with an air inlet 526, the second pump cavity 527 is communicated with an air outlet 528, a motor shaft 511 positioning device is arranged on one side of the motor shell 510, and the motor shaft 511 positioning device is in contact connection with a non-power output end of the motor shaft 511 and used for axially limiting and fixing the motor shaft 511.

In one embodiment of the invention, a check valve 524 is provided in the first pump chamber 525 for restricting the reverse flow of gas out of the pump chamber.

The vacuum pump 500 uses a motor as a driving device, an eccentric wheel 521 is connected to a motor shaft 511, an internal eccentric device 522 is driven to perform eccentric motion, a diaphragm air bag piece 523 is connected to the eccentric wheel 521, and an internal diaphragm is driven to perform reciprocating motion by the eccentric motion, so that air in the first pump cavity 525 and the second pump cavity 527 is compressed (an air inlet 526 is closed when compressed, an air outlet 528 is opened to form micro positive pressure), stretched (the air outlet 528 is closed when stretched, the air inlet 526 is opened to form negative pressure), a pressure difference is generated between the air inlet 526 and the external atmospheric pressure, and under the action of the pressure difference, air pressure (sucked) is sucked into the pump cavity, and then discharged from the air outlet 528, thereby realizing continuous air suction-exhaust circulation, and further gradually reducing the pressure in a vacuum object system.

The working principle of the vacuum pump 500 of the present invention:

as shown in fig. 9, an eccentric wheel 521 is connected to a motor shaft 511, an internal mechanical eccentric device 522 is driven to perform eccentric motion, a diaphragm air bag piece 523 is connected to the eccentric device 522, and an internal diaphragm is driven to perform reciprocating motion by the eccentric motion, so that air in a pump cavity with a fixed volume is compressed (an air inlet 526 is closed when the air outlet 528 is opened to form micro positive pressure during compression), stretched (the air outlet 528 is closed when the air inlet 526 is opened to form negative pressure during compression), a pressure difference is generated between the air inlet 526 and the external atmosphere, and under the action of the pressure difference, air pressure (sucked) is sucked into the pump cavity and discharged from the air outlet 528, so that continuous air suction-exhaust circulation is realized, and the pressure in a vacuum object system is gradually reduced.

It should be noted that, through time domain analysis of data collection of the operating frequency of the vacuum pump 500, it is found that, in the process of evacuating the vacuum pump 500, when the vacuum degree reaches a certain value, the vacuum pump 500 starts to vibrate, when the vacuum degree reaches a certain level, the vibration amplitude starts to decrease again, in the process of evacuating the vacuum degree is always increased in the time domain, time frequency analysis is performed on the acceleration data, time domain change of the vibration frequency of the analysis structure finds that, in the process of evacuating the vacuum, along with the continuous increase of the vacuum degree, the vibration frequency is in a trend of decreasing first and then increasing, because the vacuum degree increases, the difficulty of evacuating is larger and larger, the evacuating rotation speed of the vacuum pump 500 decreases, and when the vacuum degree reaches a certain level, the evacuating rotation speed of the vacuum pump 500 increases to some extent, the motor shaft 511 is provided with a motor shaft 511 positioning device at the non-power output end, so that the motor shaft 511 is axially limited, and a limiting force which is the same as the pump body vacuum pressure is generated, so that the balance of the motor shaft 511 is prevented from being damaged in the working process of pump body vacuumizing, and vibration and noise in the working process of the vacuum pump 500 are reduced.

According to the invention, through repeated experimental research and test, a physical control scheme of abnormal noise of a vacuum pump 500 body with long service life, no consumable and good effect is invented, and the implementation scheme case of the invention mainly comprises two schemes:

embodiment one:

as shown in fig. 5 and 6, the positioning device of the motor shaft 511 is set as a magnetic component, the magnetic component comprises a protecting shell 5311 and a permanent magnet 5312, the permanent magnet 5312 is arranged on one side of the motor shaft 511 sleeved with a bearing 512, the magnetic force of the permanent magnet 5312 is balanced with the axial pulling force of the motor operation so as to limit the motor shaft 511 axially, a protecting shell 5311 is arranged outside the permanent magnet 5312 to protect the permanent magnet 5312, a groove is arranged on the permanent magnet 5312, and the groove is correspondingly arranged with the motor shaft 511.

It should be noted that, because the pump body side is negative pressure during the operation of the vacuum pump 500, the permanent magnet 5312, which balances the magnetic force and the motor operation axial tension, generates the magnetic attraction force in the opposite direction of the vacuum pressure to the motor axial direction, so that the motor shaft 511 maintains the original balanced state during the operation, further, the motor vibration is determined by the characteristics of the moving parts, in order to reduce the friction force between the motor shaft 511 and the bearing 512, a certain gap needs to be left between the motor shaft 511 and the bearing 512, but due to the existence of the gap, when the negative pressure is within a certain range, the shaft deviates from the bearing 512, the noise and vibration increase, and when the negative pressure continuously increases to a certain extent, the motor shaft 511 continuously shifts slightly under the action of the negative pressure, and noise and vibration anomalies are generated.

In addition, the main characteristics of the magnetic component include that a groove is formed at the end of the permanent magnet 5312, so that the axial position of the motor is just slightly smaller than the groove, the permanent magnet 5312 can be just clamped at the outer side of the axial position of the motor, and meanwhile, in order to prevent the brittleness and the fragility of the permanent magnet 5312, a plastic or metal protective shell 5311 is arranged outside the permanent magnet 5312 to protect the permanent magnet 5312 from being damaged by other external forces.

Embodiment two:

as shown in fig. 7 and 8, the positioning device of the motor shaft 511 is set as a spring plate assembly, the spring plate assembly comprises a connecting frame 5321 and a spring piece 5322, the connecting frame 5321 is fixed on the shell of the motor, the connecting frame 5321 is arranged on one side of the motor shaft 511, one end of the spring piece 5322 is connected with the connecting frame 5321, the other end of the spring piece 5322 is connected with the motor shaft 511 in a contact manner, a circular groove is formed in the spring piece 5322 and corresponds to the motor shaft 511 in position, and graphite sheets are arranged in the circular groove.

It should be noted that, a spring piece 5322 is connected to the motor by welding, riveting, etc. to limit the motor shaft 511 axially, under the condition that the rotation performance of the shaft is not affected, one end of the spring piece 5322 props against the motor shaft 511 of the vacuum pump 500, and the acting force of the spring piece 5322 on the shaft position is balanced with the axial pulling force of the motor, so as to prevent the balance of the motor shaft 511 from being damaged during the working process of the vacuum pump 500.

In addition, the main feature of the spring plate assembly further includes that in order to prevent the spring plate 5322 from directly making physical contact with the metal of the shaft to generate friction abnormal sound, one end of the spring plate 5322 may be designed as a concave shape, wherein graphite sheets are filled for lubrication and friction reduction purposes.

The working principle of two embodiments of the invention is as follows:

as shown in fig. 5, 6, 7, 8 and 9, due to the characteristics of the vacuum pump 500, the motor rotates at a high speed to drive the piston of the pump body to reciprocate, so as to realize continuous pumping-exhausting circulation, and further gradually reduce the pressure in the vacuum object system.

According to the first conception, the fixing mode of the motor shaft is improved, the motor shaft locating device is arranged at the non-power output end of the motor shaft to play a role in limiting the axial direction of the motor shaft and generate limiting force which is the same as the vacuum pressure of the pump body, so that the balance of the motor shaft is prevented from being damaged in the working process of vacuumizing the pump body, and vibration and noise in the working process of the vacuum pump are reduced.

According to the second conception of the application, the motor shaft positioning device is arranged to be a magnetic assembly, the magnetic assembly comprises a protective shell and a permanent magnet, the permanent magnet is arranged on one side of a motor shaft sleeve bearing, the magnetic force of the permanent magnet is balanced with the motor operation axial tension, and the magnetic attraction in the opposite direction of the vacuum pressure is generated in the axial direction of the motor, so that the motor shaft maintains the original balanced state in the operation process.

According to the third conception of the application, the motor shaft positioning device is arranged as an elastic piece assembly, the elastic piece assembly comprises a connecting frame and a spring piece, the connecting frame is fixed on a shell of the motor, the connecting frame is arranged on one side of the motor shaft, one end of the spring piece is connected with the connecting frame, the other end of the spring piece is propped against the motor shaft of the vacuum pump under the condition that the rotation movement performance of the shaft is not affected, and the acting force of the spring piece on the shaft position is balanced with the running axial tension of the motor, so that the balance of the motor shaft is prevented from being damaged in the working process of the vacuum pump.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. A refrigerator, comprising:

a low-temperature storage chamber to form a low-temperature storage space;

a door body for opening or closing the low-temperature storage chamber;

the bearing frame is arranged on the door body;

the refrigerator further includes:

the vacuum box is detachably arranged on the bearing frame to form a vacuum storage space;

one end of the vacuum tube is detachably communicated with the vacuum box and used for guiding air in the vacuum box to flow out;

the vacuum pump is arranged in the door body and is communicated with the other end of the vacuum tube and used for pumping air in the vacuum box;

the vacuum pump includes: the motor comprises a motor shell and a motor shaft penetrating through the motor shell, one end of the motor shaft extends out of the motor shell and is used for being connected with external equipment to serve as a power output end, the other end of the motor shaft is sleeved with a bearing serving as a non-power output end, the bearing is fixed on the motor shell, and the motor is used for providing power for the vacuum pump; the pump body comprises a pump shell and a vacuumizing element, wherein the vacuumizing element is arranged in the pump shell, the pump shell is connected with the motor shell, and the vacuumizing element is connected with the motor shaft; the motor shaft positioning device is arranged on one side of the motor shell and is in contact connection with the non-power output end of the motor shaft and used for limiting and fixing the motor shaft axially;

the motor shaft positioning device is arranged to be a magnetic assembly, the magnetic assembly comprises a protective shell and a permanent magnet, the permanent magnet is arranged on one side of the motor shaft, which is sleeved with the bearing, the motor shaft is axially limited, and the protective shell cover is arranged outside the permanent magnet to protect the permanent magnet;

or, motor shaft positioner sets up to the shell fragment subassembly, the shell fragment subassembly includes link and spring leaf, the link is fixed on the shell of motor, just the link sets up one side of motor shaft, spring leaf one end with the link is connected, the spring leaf other end with the motor shaft contact is connected, carries out the axial spacing to the motor shaft.

2. The refrigerator according to claim 1, wherein the vacuum box comprises a box cover, the box cover is buckled on the vacuum box to form a sealed environment, a sealing interface, a pressure release valve and a lock catch are arranged on the vacuum box cover, the sealing interface is used for detachably and hermetically communicating the vacuum tube, the pressure release valve is arranged in the sealing interface and used for blocking or communicating gas in the test box with external gas, and the lock catch is used for locking the box cover on the vacuum box.

3. A vacuum pump for a refrigerator, comprising:

the motor comprises a motor shell and a motor shaft penetrating through the motor shell, one end of the motor shaft extends out of the motor shell and is used for being connected with external equipment to serve as a power output end, the other end of the motor shaft is sleeved with a bearing serving as a non-power output end, the bearing is fixed on the motor shell, and the motor is used for providing power for the vacuum pump; the pump body comprises a pump shell and a vacuumizing element, wherein the vacuumizing element is arranged in the pump shell, the pump shell is connected with the motor shell, and the vacuumizing element is connected with the motor shaft; the motor shaft positioning device is arranged on one side of the motor shell and is in contact connection with the non-power output end of the motor shaft and used for limiting and fixing the motor shaft axially;

the pump body is a diaphragm vacuum pump, and the vacuumizing element comprises: the eccentric wheel is arranged inside the pump body, and the end part of the eccentric wheel is rotatably supported on the pump shell; the eccentric device is connected with the eccentric wheel and drives the eccentric wheel to work; the eccentric device is connected with the diaphragm air bag sheet; the eccentric wheel is connected to the motor shaft, the motor shaft drives the eccentric wheel to perform eccentric motion, the eccentric device performs reciprocating motion along a horizontal direction orthogonal to the axis of the eccentric wheel, and the eccentric device drives the diaphragm air bag sheet to perform reciprocating motion;

4. A vacuum pump according to claim 3, wherein the pump body further comprises a first pump chamber and a second pump chamber, the volumes of the first pump chamber and the second pump chamber are enlarged or reduced by the action of the diaphragm air bag sheet, the first pump chamber is communicated with an exhaust port, the second pump chamber is communicated with an exhaust port, and the diaphragm air bag sheet is driven by the eccentric device to reciprocate, so that air in the first pump chamber and the second pump chamber is compressed or stretched, and the circulation of continuous air suction and exhaust is realized.

5. A vacuum pump according to claim 3, wherein the permanent magnet is provided with a groove, and the groove is provided corresponding to the motor shaft.

6. A vacuum pump according to claim 3, wherein the spring plate is provided with a circular groove, the circular groove is arranged corresponding to the motor shaft, and a graphite sheet is arranged in the circular groove.