BACKGROUND

Technical Field

This application relates to a freshness preservation container, and more particularly, to a vacuum freshness preservation container that can be pressed on two sides.

Description of Related Art

With the development of society and advancement of technology, higher requirements for the quality and time of food preservation are put forward. In order to keep the food in the container fresh, air in the container is usually drawn out to form a vacuum, so as to achieve food preservation. The freshness preservation container is generally a container that assumes to be sealed. That is, the container is sealed to prevent the air from entering the container from the outside, so as to achieve food preservation. For the freshness preservation container having this structure, the container is isolated from access of air from outside, there is still air in the container, and oxygen in the air oxidizes the food, thereby affecting the freshness of the food and limiting the preservation time.

There are vacuum freshness preservation containers available on the market, for example, a Chinese Application Publication No. CN203486343U discloses a manually vacuumized freshness preservation container including a container body and a container cover that fits with and seals the container body. The container cover includes a face shell and a bottom shell which are snapped together. A surface of the face shell has an air inlet that passes through the face shell, and the bottom of the bottom shell has an air pumping through-hole and an air entering through-hole that pass through the bottom shell. The air entering through-hole extends upwards to the air inlet, an air pumping through-hole plug is disposed at the bottom of the air pumping through-hole, and a second sealing ring is disposed at the top of the air pumping through-hole together with a manually pumped device in a sealing way. For this new type of vacuum freshness preservation container, a pump handle is manually operated, which is simple and convenient, and vacuumizing can be achieved without any additional vacuumizing equipment, such that the container is in a vacuum state, which effectively prevents the outside air from entering the vacuum freshness preservation container, so as to ensure the effect of preservation. However, each time it is vacuumized, the pump handle needs to be operated continually, resulting in low efficiency.

SUMMARY

This application is provided with a vacuum freshness preservation container that can be pressed on two sides which has high vacuumizing efficiency.

A vacuum freshness preservation container that can be pressed on two sides includes a container body and a container cover. The container cover has chambers disposed symmetrically, a piston is slidably disposed in each chamber, and each chamber has an air outlet which communicates with an interior of the container body and where a first check valve is disposed. The piston is provided with an air discharge structure that communicates the chamber with an outside when the piston moves toward the first check valve, and the container cover is provided with a linkage mechanism such that the two pistons move in opposite directions.

By disposing symmetrical chambers in which pistons are linked to move in opposite directions, when the freshness preservation container needs to be vacuumized, the piston in one of the chambers is pressed to move toward the first check valve, and air in the chamber is drawn out. At the same time, the piston in the other chamber is linked to move up, and when the piston moves up, a negative pressure is generated in a closed cavity formed between the piston and a bottom wall of the chamber to open the first check valve, thereby achieving vacuumizing of the container body. By alternately pressing pistons in two chambers, the freshness preservation container always keeps in a vacuumizing state, thereby achieving a higher efficiency.

Further, the linkage mechanism includes a connecting rod with a middle portion connected to the container cover in a way that the middle portion is slidable relative to the container cover and two ends respectively hinged to the pistons.

The connecting rod achieves linkage in opposite directions for two pistons. The structure is simple and easy to achieve, which also contributes to subsequent production and processing and effectively reduces production costs.

Further, the container cover has a mounting groove where the connecting rod is disposed, a top wall of the container cover has vertical slots which communicate with the chambers and are disposed above the chambers, and pushing blocks fixed at both ends of the connecting rod are disposed in vertical slots.

In this way, by pressing the pushing blocks, pistons move down, such that the pressing operation is simple and convenient.

Further, when the two pushing blocks are at the same height, top surfaces of the pushing blocks are flush with a top surface of the container cover, and elastic members are disposed in the vertical slots to drive the pushing blocks to be flush with the top surface of the container cover.

In this way, when the freshness preservation container is not in a vacuumizing state, under the action of the elastic members, symmetrical pushing blocks are at the same height, and top surfaces of the pushing blocks are flush with the top surface of the container cover, which can maintain the flatness of the top surface of the container cover, and the overall appearance is more flat and beautiful.

Further, the air discharge structure includes an annular groove, a gasket ring and a vent. A side wall of the piston has the annular groove at which the gasket ring is sleeved, the annular groove is formed with the vent communicating with the outside, and a width of the annular groove and a width of the vent are greater than a wire diameter of the gasket ring.

In this way, when the piston moves toward the first check valve, the gasket ring is pushed to move away from the first check valve, at this time, the vent is exposed, such that the air in the closed cavity can be discharged through the vent. When the piston moves away from the first check valve, the gasket ring is pushed to move toward the first check valve, at this time, the gasket ring plays a role of sealing, such that air in the closed cavity cannot be discharged through the vent, and a negative pressure is generated in the closed cavity to open the first check valve.

Further, the container cover has an air inlet where a second check valve is disposed.

When the container body is vacuumized and the container cover is difficult to be opened, by opening the second check valve to allow the outside air to get into the container body, the container cover can be opened smoothly.

Further, a pressure detecting member is mounted to the container cover.

The pressure detecting member plays a role of indicating, and the degree of vacuumizing in the container body can be detected by the pressure detecting member during the vacuumizing process.

Further, the container body is provided with a rim on which a sealing ring abutting against the container cover is sleeved.

First, the sealing ring can improve the sealing of a position where the container body and the container cover are connected, and prevent the outside air from entering the container body through the position where the container body and the container cover are connected. At the same time, the rim can play a role of positioning the sealing ring, and the sealing ring can be disassembled for cleaning and replacement.

Further, the container cover is provided with hinged hasps on both sides, and the container body is provided with fastening blocks for the hasps to be snapped into.

By snap connecting the container cover into the container body, detachable connection is achieved. The assembly or disassembly can be achieved by only turning the hasps. The structure is simple, and the assembly and disassembly are convenient and quick.

Further, the container body is provided with a pressing strip for pressing each pushing block, and one end of each pressing strip is rotatably connected to the container cover.

When the freshness preservation container does not need to be vacuumized, the pressure strips are turned to press the pushing blocks, such that the pushing blocks can maintain the current state stably and will not move up and down.

Further, the linkage mechanism includes a face cover which is detachably connected to one side of the connecting rod facing away from the face cover.

On the one hand, the face cover can protect the connecting rod and the pistons from being damaged, and on the other hand, it is also convenient for a user to operate.

Further, the container cover has an accommodating slot where the connecting rod and the face cover are located, and there is a gap between the face cover and a wall of the accommodating slot.

It can protect the connecting rod and the face cover to some extent, such that the connecting rod and the face cover are not easily to be damaged.

Further, the container cover has an air inlet where a fourth check valve is disposed; the face cover is provided with a button, and a transmission member is disposed between the button and the fourth check valve; and the button is pressed to open the fourth check valve.

As the container body is vacuumized and is difficult to be opened, by pressing the button to open the fourth check valve, the outside air enters the container body, and the container cover can be easily opened.

Further, the fourth check valve includes a connecting portion that passes through the air inlet, an anti-drop portion connected to the connecting portion at one end facing the accommodating slot, and a sealing portion connected to the connecting portion at one end away from the accommodating slot. An air leakage groove runs through side walls of the connecting portion and the anti-drop portion to the sealing portion.

Further, an elastic member is fixedly connected to a side wall of the transmission member, a supporting member is fixedly connected to the container cover, and one end of the elastic member away from the transmission member is connected to the supporting member.

The supporting member and the elastic member can fix and limit the transmission member, such that the transmission member is not easy to be removed from the position between the button and the fourth check valve.

Further, the air discharge structure has a valve mounting hole located on the piston and a third check valve disposed in the valve mounting hole.

When the piston moves toward the first check valve, the closed cavity communicates with the outside under the action of the air discharge structure, and when the piston moves away from the first check valve, the closed cavity is formed between the piston and the bottom wall of the chamber under the action of the air discharge structure.

In summary, this application has the following advantages.

By disposing symmetrical chambers and pistons and disposing the connecting rod by which two pistons are linked to move in opposite directions, the chambers always keep in a vacuumizing state by alternatively pressing driving members in two chambers, which improves the vacuumizing efficiency. When the freshness preservation container is not in a vacuumizing state, under the action of the elastic members, it can maintain the flatness of the top surface of the container cover, such that the overall appearance is flat and beautiful.

