阅读说明：本技术 一种低温储藏装置 (Low-temperature storage device ) 是由 杨春 刘铁伟 张建 于 2019-11-20 设计创作，主要内容包括：本发明实施例公开了一种低温储藏装置,涉及低温储藏装置技术领域。用来解决相关技术中的低温储藏装置在对真空室抽真空的过程中噪声较大的问题。该低温储藏装置,包括：箱体,箱体用于形成低温储藏空间；真空室,位于所述箱体内或门体上；抽真空装置,抽真空装置与真空室连通；其中,抽真空装置包括：真空泵,真空泵包括具有封闭腔的泵体以及设置于封闭腔内的抽气组件,抽气组件包括活塞以及与活塞相连接的连杆,活塞与封闭腔的腔壁围成抽吸区,泵体上开设有均与抽吸区连通的进气口以及排气口,进气口与真空室连通；驱动装置,驱动装置与连杆相连接,且用于驱动连杆运动,以通过活塞改变抽吸区的大小。本发明可用于冰箱等低温储藏装置中。(The embodiment of the invention discloses a low-temperature storage device, and relates to the technical field of low-temperature storage devices. The device is used for solving the problem that the low-temperature storage device in the related art is relatively noisy in the process of vacuumizing a vacuum chamber. The cryogenic storage device includes: a box body for forming a low-temperature storage space; the vacuum chamber is positioned in the box body or on the door body; the vacuumizing device is communicated with the vacuum chamber; wherein, evacuating device includes: the vacuum pump comprises a pump body with a closed cavity and an air extraction assembly arranged in the closed cavity, the air extraction assembly comprises a piston and a connecting rod connected with the piston, the piston and the cavity wall of the closed cavity enclose a suction area, the pump body is provided with an air inlet and an air outlet which are communicated with the suction area, and the air inlet is communicated with the vacuum chamber; and the driving device is connected with the connecting rod and is used for driving the connecting rod to move so as to change the size of the suction area through the piston. The invention can be used in low-temperature storage devices such as refrigerators.)

1. A cryogenic storage device comprising:

a case for forming a low-temperature storage space;

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

the vacuum chamber is positioned in the box body or on the door body;

the vacuumizing device is communicated with the vacuum chamber;

characterized in that, evacuating device includes:

the vacuum pump comprises a pump body with a closed cavity and an air pumping assembly arranged in the closed cavity, the air pumping assembly comprises a piston and a connecting rod connected with the piston, the piston and the cavity wall of the closed cavity enclose a pumping area, the pump body is provided with an air inlet and an air outlet which are communicated with the pumping area, and the air inlet is communicated with the vacuum chamber;

and the driving device is connected with the connecting rod and is used for driving the connecting rod to move so as to change the size of the suction area through the piston, and the gas in the vacuum chamber is sucked into the suction area through the gas inlet and is discharged through the gas outlet.

2. The cryogenic storage device of claim 1,

the driving device comprises a motor and a rotating part arranged in the closed cavity, and the rotating part is connected with an output shaft of the motor;

the first end of connecting rod with the piston is connected, the second end with it is connected to rotate the piece, the motor can drive it rotates to rotate to drive the connecting rod motion, makes the piston change the size in suction area.

3. The cryogenic storage device of claim 2,

the rotating part is an eccentric shaft, a mounting hole is formed in the position of the second end of the connecting rod, and the eccentric shaft can be rotatably arranged in the mounting hole in a penetrating mode, so that the connecting rod and the eccentric shaft form a crankshaft connecting rod mechanism.

4. The cryogenic storage device of claim 3,

the eccentric shaft comprises a shaft body and a rotating balance part, the shaft body is rotatably arranged in the mounting hole in a penetrating mode and is connected with an output shaft of the motor, the rotating balance part is arranged on a position, extending out of the mounting hole, of the shaft body, the rotating balance part is located on one side, close to the rotating central axis, of the shaft body in a first cross section, and the first cross section is a cross section passing through the geometric central axis and the rotating central axis of the shaft body.

5. The cryogenic storage device of claim 2,

the piston is flexible, be formed with spacing annular on the inner wall in closed chamber, the edge cooperation of flexible piston stretches into in the spacing annular, the first end of connecting rod with the central point of flexible piston is connected.

6. The cryogenic storage device of claim 2,

the motor set up in on the pump body, set up on the pump body with the pilot hole that the closed chamber is linked together, the output shaft of motor passes through the pilot hole stretches into in the closed chamber, and with rotate the piece and be connected.

7. The low-temperature storage apparatus according to any one of claims 1 to 6,

the suction area comprises an air inlet channel, a driving area and an air outlet channel, the driving area is opposite to the piston, the inlet of the air inlet channel is the air inlet, and the outlet of the air inlet channel is communicated with the driving area; the inlet of the air outlet channel is communicated with the driving area, and the outlet of the air outlet channel is the air outlet;

the vacuum pump further comprises a first one-way valve and a second one-way valve, the first one-way valve is arranged in the air inlet channel, an air inlet end of the first one-way valve is communicated with the air inlet, and an air outlet end of the first one-way valve is communicated with the driving area; the second one-way valve is arranged in the air outlet channel, the air inlet end of the second one-way valve is communicated with the driving area, and the air outlet end of the second one-way valve is communicated with the air outlet.

8. The cryogenic storage device of claim 7,

the first check valve comprises a first baffle and a first elastic valve plate, the first baffle is arranged in the air inlet channel and blocks the air inlet channel, a first vent hole is formed in the first baffle, and the first elastic valve plate covers the surface of one side, close to the driving area, of the first baffle and covers the first vent hole;

when the pressure of the air inlet side of the first vent hole is greater than that of the air outlet side and the air pressure difference is greater than or equal to a first threshold value, the first elastic valve plate can be pushed open by air to open the air inlet channel;

when the pressure of the air inlet side of the first vent hole is smaller than the pressure of the air outlet side, or the air pressure difference between the two sides of the first vent hole is smaller than the first threshold value, the first elastic valve plate resets to close the air inlet channel.

9. The cryogenic storage device of claim 7,

the second check valve comprises a second baffle and a second elastic valve plate, the second baffle is arranged in the air outlet channel and blocks the air outlet channel, a second vent hole is formed in the second baffle, and the second elastic valve plate covers the surface of one side, far away from the driving area, of the second baffle and covers the second vent hole;

when the pressure of the air inlet side of the second vent hole is greater than the pressure of the air outlet side and the air pressure difference is greater than or equal to a second threshold value, the second elastic valve plate can be pushed open by air to open the air outlet channel;

and when the pressure of the air inlet side of the second vent hole is smaller than the pressure of the air outlet side, or the air pressure difference between the two sides of the second vent hole is smaller than the second threshold value, the second elastic valve plate resets to close the air outlet channel.

10. The low-temperature storage apparatus according to any one of claims 1 to 6,

the closed cavity comprises a first sub-cavity and a second sub-cavity, an avoiding opening is formed in the cavity wall between the first sub-cavity and the second sub-cavity, the piston is located in the first sub-cavity, the piston and the cavity wall of the first sub-cavity are enclosed to form the pumping area, one part of the connecting rod is located in the second sub-cavity, the other part of the connecting rod passes through the avoiding opening and extends into the first sub-cavity, the piston is connected with the connecting rod, and the driving device and the connecting rod are located in the part in the second sub-cavity and are connected with each other.

11. The cryogenic storage device of claim 10,

the pump body comprises a base, a first sealing cover and a second sealing cover, the base is provided with a first opening cavity and a second opening cavity, the first sealing cover is detachably arranged at an opening of the first opening cavity in a covering mode, and therefore the first sealing cover and the first opening cavity form a first sub-cavity; the second sealing cover is detachably covered at the opening of the second opening cavity, so that the second sealing cover and the second opening cavity form the second sub-cavity.

12. The low-temperature storage apparatus according to any one of claims 1 to 6,

the vacuum chamber is positioned in the box body;

the box body is also provided with a compressor bin, and the vacuumizing device is arranged in the compressor bin; alternatively, the first and second electrodes may be,

the vacuumizing device is positioned in the box body and is positioned at the rear side of the vacuum chamber.

Technical Field

The invention relates to the technical field of low-temperature storage device structures, in particular to a low-temperature storage device.

Background

With the continuous progress of technology, a storage chamber (also known as a "vacuum chamber") capable of being vacuumized is added to a low-temperature storage device such as a refrigerator, and the air content in the vacuum chamber is reduced by pumping out the air in the vacuum chamber to weaken the oxidation process of food, so that the preservation time and quality of the food are prolonged. The evacuation of the vacuum chamber gas is accomplished by the evacuation device, and how to design the evacuation device becomes an important issue in the development of the low-temperature storage device.

Disclosure of Invention

Embodiments of the present invention provide a cryogenic storage device to solve the problem of the related art that the cryogenic storage device generates a loud noise during the process of evacuating a vacuum chamber.

To achieve the above object, an embodiment of the present invention provides a cryogenic storage device, including: a case for forming a low-temperature storage space; a door for opening or closing the low-temperature storage space; the vacuum chamber is positioned in the box body or on the door body; the vacuumizing device is communicated with the vacuum chamber; the vacuum-pumping device comprises: the vacuum pump comprises a pump body with a closed cavity and an air pumping assembly arranged in the closed cavity, the air pumping assembly comprises a piston and a connecting rod connected with the piston, the piston and the cavity wall of the closed cavity enclose a pumping area, the pump body is provided with an air inlet and an air outlet which are communicated with the pumping area, and the air inlet is communicated with the vacuum chamber; and the driving device is connected with the connecting rod and is used for driving the connecting rod to move so as to change the size of the suction area through the piston, and the gas in the vacuum chamber is sucked into the suction area through the gas inlet and is discharged through the gas outlet.

According to the low-temperature storage device provided by the embodiment of the invention, as the vacuum pump comprises the pump body with the closed cavity, and the air extraction assembly is arranged in the closed cavity, when the vacuum pump works, the cavity wall of the closed cavity can isolate noises generated by the connecting rod and the piston in the air extraction assembly, so that the noises are prevented from being transmitted to the outside of the closed cavity, the noises generated by the vacuum pump during working can be greatly reduced, and the experience of a user in the using process can be improved; in addition, the wall of the closed cavity can block noise generated by the air exhaust assembly, so that the vacuum pump and the driving device are not required to be integrally arranged in the sound insulation device, and the occupied space of the vacuum pumping device is favorably reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a related art evacuation device;

FIG. 2 is a cross-sectional view of a refrigerator in some embodiments of the present invention;

FIG. 3 is a cross-sectional view of a refrigerator in accordance with further embodiments of the present invention;

FIG. 4 is a perspective view showing a vacuum apparatus of a refrigerator according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of section A of the evacuation device of FIG. 4;

FIG. 6 is a state diagram of the vacuum extractor of the refrigerator according to the embodiment of the present invention (a) shows a state diagram of the vacuum extractor during air suction and (b) shows a state diagram of the vacuum extractor during air exhaust);

FIG. 7 is an exploded view of the vacuum apparatus of FIG. 4;

FIG. 8 is a partial exploded view of the evacuation device of FIG. 4;

FIG. 9 is a view of the first seal cap of FIG. 8 in the direction of B;

FIG. 10 is a view of the first seal cap of FIG. 8 in the direction of C;

figure 11 is an exploded view of a pumping assembly in an embodiment of the present invention;

fig. 12 is an exploded view of the pump body in an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The low-temperature storage device provided by the embodiment of the invention can be a refrigerator, a refrigerator and other low-temperature storage devices with a vacuum chamber.

The principle of the low-temperature storage device of the present invention will be described below by taking a refrigerator as an example, and the structure of other low-temperature storage devices can be specifically set with reference to the structure in the embodiment of the refrigerator.

Fig. 2 is a cross-sectional view showing an embodiment of the refrigerator according to the present invention, and as shown in fig. 2, the refrigerator according to the embodiment of the present invention has a cabinet 200, a low temperature storage space 210 formed in the cabinet 200, and a door 300, the door 300 being used to open or close the low temperature storage space 210;

as shown in fig. 2, the low-temperature storage space 210 is vertically partitioned into a freezing chamber 211 below, a vacuum chamber 212 above the freezing chamber 211, and a refrigerating chamber 213 above the vacuum chamber 212, and each of the partitioned spaces may have an independent storage space.

In detail, the freezing chamber 211, the vacuum chamber 212, and the refrigerating chamber 213 are selectively opened or closed by a freezing chamber door 310, a vacuum chamber door 320, and a refrigerating chamber door 330, respectively.

As shown in fig. 2, the refrigerator further includes a vacuum-pumping device 100, the vacuum-pumping device 100 being in communication with the vacuum chamber 212; wherein, evacuating device 100 includes:

a vacuum pump 1, as shown in fig. 4, 5 and 7, the vacuum pump 1 includes a pump body 11 having a closed cavity 111 and an air-extracting assembly 12 disposed in the closed cavity 111, the air-extracting assembly 12 includes a piston 121 and a connecting rod 122 connected to the piston 121, the piston 121 and a cavity wall of the closed cavity 111 enclose a pumping area 112, the pump body 11 is provided with an air inlet 113 and an air outlet 114 (as shown in fig. 8) both communicated with the pumping area 112, the air inlet 113 is communicated with a vacuum chamber 212; the driving device 2, as shown in fig. 5 and 6, is connected to the connecting rod 122, and is used for driving the connecting rod 122 to move, so as to change the size of the pumping area 112 through the piston 121, and the gas in the vacuum chamber 212 is pumped into the pumping area 112 through the gas inlet 113 and is exhausted through the gas outlet 114.

When the vacuum pump 1 is in operation, the driving device 2 drives the connecting rod 122 to move, the piston 121 changes the size of the pumping area 112 under the action of the connecting rod 122, so that the gas pressure of the pumping area 112 is changed, and under the action of the pressure, the gas in the vacuum chamber 212 is pumped into the pumping area 112 through the gas inlet 113 and is exhausted from the gas outlet 114. The air outlet 114 may be in communication with the outside atmosphere, or may be in communication with a collecting device, and is not particularly limited herein.

Fig. 2 shows a case where the vacuum chamber 212 is disposed in the box 200, and of course, the vacuum chamber 212 may be disposed in the box 200, or may be disposed on the door 300, and may be determined according to the type and size of the food stored in the vacuum chamber 212. When the vacuum chamber 212 is disposed on the door 300, the vacuum extractor 100 may be disposed on the door 300 in order to facilitate connection between the vacuum extractor 100 and the vacuum chamber 212.

In the refrigerator, as shown in fig. 5, since the vacuum pump 1 includes the pump body 11 having the closed cavity 111, and the air extraction assembly 12 is disposed in the closed cavity 111, when the vacuum pump 1 works, the cavity wall of the closed cavity 111 can isolate noise generated by the connecting rod 122 and the piston 121 in the air extraction assembly 12, so as to prevent the noise from spreading to the outside of the closed cavity 111, so that noise generated by the vacuum pump 1 during working can be greatly reduced, which is beneficial to improving user experience during use; in addition, since the wall of the closed cavity 111 can block the noise generated by the pumping assembly 12, it is not necessary to integrally dispose the vacuum pump 1 and the driving apparatus 2 in a sound insulation apparatus (such as a sound insulation box), which is beneficial to reducing the occupied space of the vacuum pumping apparatus 100.

In the above embodiment, the structure of the driving device 2 is not exclusive, for example, the driving device 2 can change the size of the suction area 112 by driving the piston 121 through the rotating member 22 and the connecting rod 122: as shown in fig. 5, the driving device 2 includes a motor 21 and a rotating member 22 disposed in the closed cavity 111, the rotating member 22 is connected to an output shaft of the motor 21, a first end of a connecting rod 122 is connected to the piston 121, a second end of the connecting rod is connected to the rotating member 22, and the motor 21 can drive the rotating member 22 to rotate so as to drive the connecting rod 122 to move, so that the piston 121 changes the size of the suction area 112.

In addition, the driving device 2 can also drive the piston 121 to change the size of the suction area 112 by a linear driving component, which is as follows: the driving device 2 includes a push rod motor, and the first end of the connecting rod 122 is connected to the piston 121, and the second end is connected to the push rod of the push rod motor. In operation, the rod 122 is reciprocated by the rod of the rod motor to cause the piston 121 to change the size of the pumping region 112, thereby causing the vacuum pump 1 to pump the gas in the vacuum chamber 212. Compared with the embodiment that the driving device 2 comprises the push rod motor, in the embodiment that the driving device 2 comprises the motor 21 and the rotating part 22, as shown in fig. 5, the motor 21 only needs to rotate in one direction to drive the connecting rod 122 to reciprocate through the rotating part 22, and the rotating direction of the motor 21 does not need to be changed frequently, so that the time for the piston 121 to complete one suction action is shorter, and the air suction amount of the vacuum pump 1 is ensured.

In the embodiment where the driving device 2 includes the motor 21 and the rotating member 22, the structure of the rotating member 22 is not exclusive, for example, as shown in fig. 5 and 7, the rotating member 22 may be an eccentric shaft, a mounting hole 1221 is formed at the position of the second end of the connecting rod 122, and the eccentric shaft is rotatably inserted into the mounting hole 1221, so that the connecting rod 121 and the eccentric shaft form a crankshaft connecting rod mechanism; in operation, the eccentric shaft is rotated by the motor 21, and the eccentric shaft rotates relative to the second end of the connecting rod 122, and moves the connecting rod 122 in a reciprocating motion, so that the piston 121 changes the size of the pumping region 112.

Alternatively, the rotating member 22 may be an eccentric, and the second end of the connecting rod 122 may be rotatably connected to a portion of the eccentric that is offset from the center of rotation. In operation, the eccentric is rotated by the motor 21, such that the connecting rod 122 is caused to oscillate back and forth by the eccentric and to move the piston 121 to change the size of the suction zone 112. In this embodiment, the connecting rod 122 is sleeved on the eccentric shaft, so that the connection is compact, and the size of the eccentric shaft can be smaller than that of the design to reduce excessive occupation of the space in the closed cavity 111. When the turning member 22 is an eccentric shaft, the connecting rod 122 is sleeved on the eccentric shaft, so that the connection between the connecting rod 122 and the turning member 22 is compact, and the excessive occupation of the space in the closed cavity 111 can be reduced.

In order to reduce the resistance to relative rotation between the eccentric shaft and the mounting hole 1221 of the connecting rod 122 when the rotating member 22 is an eccentric shaft, as shown in fig. 5 and 7, the driving device 2 further includes a rotating bearing 23, and the rotating bearing 23 is disposed between the eccentric shaft and the hole wall of the mounting hole 1221. By providing the rotating bearing 23, the resistance to relative rotation between the eccentric shaft and the mounting hole 1221 of the connecting rod 122 is reduced, and the rotation between the eccentric shaft and the mounting hole 1221 can be smoother.

When the eccentric shaft rotates, because the center of mass of the eccentric shaft is not on the geometric central axis of the eccentric shaft, the eccentric shaft is not easy to keep balance and is easy to shake, in order to solve the problem, as shown in fig. 5, the eccentric shaft includes a shaft body 221 and a rotation balance portion 222, the shaft body 221 is rotatably disposed in the mounting hole 1221 and connected to the output shaft of the motor 21, the rotation balance portion 222 is disposed on a portion of the shaft body 221 extending out of the mounting hole 1221, and in a first cross section, the rotation balance portion 222 is located on a side of the shaft body 221 closer to the rotation central axis a (i.e., on the right side of the shaft body 221 shown in fig. 5), and the first cross section is a cross section passing through the geometric central axis b and the rotation central axis a of the. Since the rotation balance part 222 is disposed on the side of the shaft body 221 closer to the rotation central axis a, the mass of the side of the shaft body 221 closer to the rotation central axis a can be increased, and the position of the center of mass of the eccentric shaft is located on the rotation central axis a of the shaft body 221, so that the eccentric shaft keeps dynamic balance when rotating.

In the vacuum pumping apparatus 100, the arrangement relationship between the piston 121 and the wall of the closed cavity 111 is not exclusive, and for example, the arrangement manner may be that, as shown in fig. 5, the piston 121 is a flexible piston, a limit ring groove 115 is formed on the inner wall of the closed cavity 111, the edge of the flexible piston is fitted into the limit ring groove 115, and the first end of the connecting rod 122 is connected to the central portion of the flexible piston. In operation, as shown in fig. 6, the connecting rod 122 reciprocates to drive the center of the flexible piston to protrude to two sides in sequence, so as to change the size of the pumping region 112 and thus the pressure of the pumping region 112, and under the action of the pressure, the gas in the vacuum chamber 212 is pumped into the pumping region 112 through the gas inlet 113 and is exhausted through the gas outlet 114. As shown in fig. 5 and 11, the air extracting assembly 12 further includes a connecting member 123, and the connecting rod 122 may be connected to the central portion of the piston 121 through the connecting member 123.

In addition, the following setting modes can be adopted: the piston 121 is slidably connected to the inner wall of the closed chamber 111. In operation, the first end of the connecting rod 122 reciprocates to drive the piston 121 to slide relative to the inner wall of the closed cavity 111, so as to change the size of the pumping region 112 and thus change the pressure of the pumping region 112, and under the action of the pressure, the gas in the vacuum chamber 212 is pumped into the pumping region 112 through the gas inlet 113 and is exhausted through the gas outlet 114.

In the vacuum extractor 100, the motor 21 is not arranged in a unique manner, for example, an output shaft of the motor 21 may extend into the closed cavity 111, as shown in fig. 5 and 7, the motor 21 is arranged on the pump body 11, an assembly hole 116 communicating with the closed cavity 111 is formed on the pump body 11, and the output shaft of the motor 21 extends into the closed cavity 111 through the assembly hole 116 and is connected with the rotating member 22. In addition, the motor 21 may be integrally provided in the closed chamber 111. Compared with the method that the motor 21 is integrally arranged in the closed cavity 111, the output shaft of the motor 21 extends into the closed cavity 111, so that the closed cavity 111 does not need to be arranged to be larger to envelop the motor 21, excessive redundant space is avoided being generated in the closed cavity 111, the layout in the closed cavity 111 is more compact, and the occupied space of the whole vacuumizing device 100 is reduced.

As shown in fig. 5 and 8, in the vacuum pump 1, the suction region 112 includes an air inlet channel 1121, a driving region 1122, and an air outlet channel 1123, the driving region 1122 is opposite to the piston 121, an inlet of the air inlet channel 1121 is an air inlet 113, and an outlet is communicated with the driving region 1122; an inlet of air outlet channel 1123 is communicated with driving region 1122, and an outlet is air outlet 114.

In order to prevent the vacuum pump 1 from sucking gas from the gas inlet 113 and the gas outlet 114 at the same time during air suction or exhausting gas from the gas inlet 113 and the gas outlet 114 at the same time during air exhaust, as shown in fig. 5 and 6, the vacuum pump 1 further includes a first check valve 13 and a second check valve 14, the first check valve 13 is disposed in the gas inlet channel 1121, and the gas inlet end of the first check valve 13 is communicated with the gas inlet 113 and the gas outlet end is communicated with the driving region 1122; the second check valve 14 is disposed in the air outlet channel 1123, and an air inlet end of the second check valve 14 is communicated with the driving region 1122, and an air outlet end is communicated with the air outlet 114. By arranging the first check valve 13 and the second check valve 14, when the vacuum pump 1 sucks air, the air enters the air inlet channel 1121 from the air inlet 113 and then enters the driving region 1122 through the first check valve 13, and since the second check valve 14 can prevent the air from flowing into the driving region 1122 from the air outlet 114, the air is prevented from being sucked from the air inlet 113 and the air outlet 114 at the same time; when the vacuum pump 1 exhausts, gas flows into the gas outlet channel 1123 from the driving area 1122, and then is exhausted through the second one-way valve 14 and the gas outlet 114, because the first one-way valve 13 can prevent the gas from flowing from the driving area 1122 to the gas inlet 113, the gas is prevented from being exhausted from the gas inlet 113 and the gas outlet 114 at the same time, and normal pumping and exhausting of the vacuum pump 1 are ensured.

The structure of the first check valve 13 is not exclusive, and for example, the first check valve 13 may have the following structure: as shown in fig. 5, 6 and 10, the first check valve 13 includes a first baffle 131 and a first elastic valve plate 132, the first baffle 131 is disposed in the air intake channel 1121, and blocks the air intake channel 1121, the first baffle 131 is provided with a first vent hole 1311, and the first elastic valve plate 132 covers a side surface of the first baffle 131 close to the driving region 1122 and covers the first vent hole 1311; when the pressure at the air inlet side of the first vent hole 1311 is greater than the pressure at the air outlet side, and the air pressure difference is greater than or equal to the first threshold (i.e., the opening pressure of the first check valve 13), the first resilient valve sheet 132 may be pushed open by the air to open the air inlet channel 1121; when the pressure at the air inlet side of the first vent hole 1311 is smaller than the pressure at the air outlet side, or the air pressure difference between the two sides of the first vent hole 1311 is smaller than the first threshold value, the first resilient valve plate 132 is reset to close the air inlet channel 1121.

In addition, the first check valve 13 may be a common air passage check valve having a valve body and a valve element provided in the valve body. Compared with a common air path one-way valve, the first one-way valve 13 shown in fig. 5 and 6 does not need to be provided with a valve body, so that the structure is simpler, and the occupied space is smaller.

The structure of the second check valve 14 is also not exclusive, for example, the second check valve 14 may have the following structure: as shown in fig. 5, 6 and 10, the second check valve 14 includes a second baffle 141 and a second elastic valve plate 142, the second baffle 141 is disposed in the air outlet passage 1123 and blocks the air outlet passage 1123, a second air vent 1411 is disposed on the second baffle 141, and the second elastic valve plate 142 covers a side surface of the second baffle 141 away from the driving region 1122 and covers the second air vent 1411; when the pressure on the air inlet side of the second vent hole 1411 is greater than the pressure on the air outlet side, and the air pressure difference is greater than or equal to a second threshold (i.e., the opening pressure of the second check valve 14), the second resilient valve sheet 142 can be pushed open by the air to open the air outlet channel 1123; when the pressure at the air inlet side of the second vent hole 1411 is smaller than the pressure at the air outlet side, or the air pressure difference between the two sides of the second vent hole 1411 is smaller than a second threshold value, the second resilient valve sheet 142 is reset to close the air outlet channel 1123.

In addition, the second check valve 14 may be a common air passage check valve having a valve body and a valve element provided in the valve body. Compared with a common air path one-way valve, the second one-way valve 14 shown in fig. 5 and 6 does not need to be provided with a valve body, so that the structure is simpler, and the occupied space is smaller.

The first elastic valve plate 132 and the second elastic valve plate 142 may be both rubber plates, or elastic valve plates made of other materials, and are not specifically limited herein; as shown in fig. 5 and 7, the first resilient sheet 132 can be disposed on the first baffle 131 through the first positioning shaft 133, and the second resilient sheet 142 can be disposed on the second baffle 141 through the second positioning shaft 143.

In the vacuum pump 1, the closed cavity 111 may be an integral cavity; in addition, the closed cavity 111 may also be divided into a plurality of sub-cavities, as shown in fig. 5, 7 and 12, the closed cavity 111 includes a first sub-cavity 1111 and a second sub-cavity 1112, an avoidance opening 1113 is formed on a cavity wall between the first sub-cavity 1111 and the second sub-cavity 1112, the piston 121 is located in the first sub-cavity 1111 and encloses a suction area 112 with the cavity wall of the first sub-cavity 1111, a part of the connecting rod 122 is located in the second sub-cavity 1112, another part of the connecting rod 122 extends into the first sub-cavity 1111 through the avoidance opening 1113 and is connected with the piston 121, and the driving device 2 is connected with the part of the connecting rod 122 located in the second sub-cavity 1112. Compared with the embodiment that the closed cavity 111 is an integral cavity, in the embodiment that the closed cavity 111 includes the first sub-cavity 1111 and the second sub-cavity 1112, the connection portions of the piston 121, the connecting rod 122 and the driving device 2 are respectively arranged in different sub-cavities, so that the cavity walls of the first sub-cavity 1111 and the second sub-cavity 1112 can play a role in separating noise generated by the piston 121 and the connecting rod 122 to a certain extent, and the noise generated by the two is prevented from being mixed together to generate resonance, thereby being beneficial to reducing the noise generated by the vacuum pump 1 during operation.

In order to facilitate the assembly and disassembly of the piston 121, the driving device 2 and other components, as shown in fig. 5, 7 and 12, the pump body 11 includes a base 117, a first sealing cover 118a and a second sealing cover 118b, the base 117 has a first open cavity 1171 and a second open cavity 1172, the first sealing cover 118a is detachably covered on the opening of the first open cavity 1171, so that the first sealing cover 118a and the first open cavity 1171 form a first sub-cavity 1111; the second sealing cap 118b is removably disposed over the opening of the second open cavity 1172 such that the second sealing cap 118b and the second open cavity 1172 form a second sub-cavity 1112. Since the first sealing cover 118a is detachably covered at the opening of the first open cavity 1171, when the piston 121 needs to be disassembled, the first sealing cover 118a can be conveniently disassembled from the base 117, and then the piston 121 can be conveniently disassembled; since the second sealing cover 118b is detachably covered at the opening of the second open cavity 1172, when the driving device 2 needs to be disassembled, the second sealing cover 118b can be conveniently disassembled from the base 117, and then the driving device 2 and the connecting rod 122 can be conveniently assembled or disassembled.

The first sealing cover 118a and the second sealing cover 118b may be detachably clamped to the base 117 by a clamping structure, and may also be detachably connected to the base 117 by a fastener, which is not limited herein.

As shown in fig. 5 and 9, a first mounting opening 1181 is formed at a position of the first sealing cover 118a corresponding to the air outlet channel 1123, an air outlet end cover 119a is covered at the first mounting opening 1181, and the air outlet 114 may be disposed on the air outlet end cover 119 a.

The air outlet end cap 119a may be detachably clamped with the first sealing cover 118a through a clamping structure, or may be detachably connected with the first sealing cover 118a through a fastener, which is not specifically limited herein.

As shown in fig. 5 and 7, a second mounting opening 1182 is formed at a position of the first sealing cover 118a corresponding to the air intake channel 1121, and an air intake cover 119b is covered at the second mounting opening 1182.

The air inlet end cover 119b may be detachably clamped with the first seal cover 118a through a clamping structure, or may be detachably connected with the first seal cover 118a through a fastener, which is not specifically limited herein;

in order to ensure the tightness of the air inlet path 1121, as shown in fig. 5, the joint of the air inlet cover 119b and the first seal cover 118a is coated with a sealing adhesive to prevent air leakage.

In the embodiment where the vacuum chamber 212 is located in the box 200, the vacuum extractor 100 may be located in a different position, for example, a compressor compartment 220 is formed in the box 200, and the vacuum extractor 100 is located in the compressor compartment 220, as shown in fig. 2; further, the vacuum extractor 100 may be provided at a position where the vacuum extractor 100 is located inside the housing 200 and on the rear side of the vacuum chamber 212, as shown in fig. 3. When the vacuum extractor 100 is installed in the compressor compartment 220, the space occupied by the upper portion of the refrigerator can be reduced, and the vacuum chamber 212 can be made larger to meet the requirement of storing food and the like.

Here, the rear side of the vacuum chamber 212 refers to a side of the vacuum chamber 212 away from the vacuum chamber door 320 in the depth direction of the vacuum chamber 212, and the depth direction of the vacuum chamber 212 refers to a direction parallel to the thickness direction of the vacuum chamber door 320 in the case where the vacuum chamber door 320 is closed, for example, the Y direction in fig. 3.

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

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.