CN209758030U - Negative pressure adjustable constant pressure automatic vacuum fresh-keeping tank - Google Patents

Abstract

The utility model provides a constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure, which comprises an upper cover and a tank body, wherein the upper cover is buckled at the top of the tank body; the upper cover is provided with a vacuum pump, a power supply, a control circuit provided with a vacuum pump load current detection circuit, a negative pressure switch, a pressure relief mechanism and a sealing rubber ring; the tank body is an object placing space; when the upper cover is buckled on the tank body, the tank body becomes an airtight space which can be vacuumized by the sealing rubber strip; the control circuit drives the vacuum pump to pump air, the vacuum pump load current detection circuit stops pumping air by the vacuum pump at the set vacuum degree upper limit, and the negative pressure switch is started when detecting the vacuum degree lower limit, so that the vacuum tank is kept in a vacuum state all the time in a power supply maintaining period in a circulating mode; the fresh-keeping period of the food in the vacuum container is prolonged compared with the ordinary state, and the food storage requirement of people is met; the food material storage tank is simple to use, the upper cover can be buckled, vacuum pumping can be automatically or manually started, vacuum is released by one key, the tank body for storing food materials is a single component, other accessories are not needed, and the food material storage tank is easy to clean.

Description

negative pressure adjustable constant pressure automatic vacuum fresh-keeping tank

Technical Field

The utility model belongs to the technical field of the vacuum refreshing container technique and specifically relates to an automatic vacuum refreshing jar of negative pressure adjustable constant voltage.

Background

People always have higher requirements on food preservation, and vacuum preservation is favored by people as a physical preservation method. The vacuum degree of a common vacuum container which is well designed and manufactured accurately can be gradually reduced along with the time lapse, and people need a container which is low in cost and can self-maintain vacuum for a long time to realize the fresh keeping of food; because of commonly used, the air exhaust, taking and cleaning are simpler. Meanwhile, people also want to set different vacuum degrees for different foods, and the conventional method must set a plurality of negative pressure switches or negative pressure sensors, however, the former is large in volume, and the latter is high in cost. In view of this, the present invention is especially provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art to the automatic vacuum refreshing jar of negative pressure adjustable constant voltage that provides facilitates the use, can long-term oneself maintain vacuum, and easy washing.

The utility model discloses specifically adopt following technical scheme to realize:

The utility model provides an automatic vacuum refreshing jar of negative pressure adjustable constant voltage, includes upper cover, jar body, the upper cover lock closes jar body top, the upper cover with be equipped with sealed rubber ring between the jar body, make jar body forms into airtight space, be equipped with vacuum pump, power, negative pressure detection device, control circuit and pressure relief device in the upper cover, vacuum pump, power and negative pressure detection device all with control circuit connects.

Preferably, the negative pressure detecting device is a negative pressure switch or a negative pressure sensor.

preferably, the upper cover comprises an upper shell and an inner cover, the upper shell is arranged on the inner cover, the upper shell is connected with the inner cover in an airtight mode, the sealing rubber ring is arranged between the outer edge of the inner cover and the tank body, the vacuum pump, the power supply, the control circuit and the pressure relief device are arranged above one side of the inner cover, the inner cover is provided with at least one vent hole, and the vacuum pump, the negative pressure detection device and the pressure relief device are all connected with the vent holes or connected through a tee joint.

Preferably, the pressure relief device comprises a pressure relief button, an O-shaped ring, a pressure lever and a spring, the O-shaped ring and the spring are respectively sleeved at two ends of the pressure lever, the pressure relief button is sleeved at the outer side of the pressure lever, and the O-shaped ring is ejected at an outlet of the pressure relief device by the spring.

Preferably, the pressure relief device is an electromagnetic valve, and the electromagnetic valve is electrically connected with the control circuit.

Preferably, the vacuum pump has a check function or a check valve is arranged at the front end of the air pump, and the negative pressure detection device is a negative pressure switch or a negative pressure sensor.

Preferably, the upper cover is further provided with a small cover, the upper shell is provided with an upper shell outlet, the bottom of the outer side of the upper shell outlet is provided with an upper rubber ring, the small cover is buckled on the upper shell outlet, and the upper rubber ring is matched with the small cover, so that the small cover and the upper shell are airtight; and an inner cover outlet is formed in one side of the inner cover, corresponds to the upper shell outlet, and is airtight at the joint of the inner cover outlet and the upper shell outlet through a middle rubber ring.

Preferably, the side surface of the small cover is provided with a magnet, the control circuit is provided with a Hall sensing switch or a reed switch, and the Hall sensing switch or the reed switch is electrically connected with the control circuit.

Preferably, a microswitch or a photoelectric switch is arranged on one side, close to the small cover, of the upper shell, the microswitch or the photoelectric switch is pressed when the small cover is sleeved on the upper shell, and the microswitch or the photoelectric switch is electrically connected with the control circuit.

Preferably, the upper cover further comprises a charcoal box cover, and the charcoal box cover is detachably arranged below the inner cover.

the utility model provides an automatic vacuum of constant voltage jar that keeps fresh, its beneficial effect lies in: the container is always kept in a vacuum state during the power supply maintaining period, so that the freshness keeping period of food in the vacuum container is prolonged; the negative pressure is adjustable; the integration level is high, the number of components is small for users, the use is simple, the vacuum can be automatically started or started by one key, and the vacuum can be automatically stopped, self-maintained and released by one key; the tank body for placing the articles has no component, and is easy to clean.

Drawings

FIG. 1 is a schematic diagram of the components of embodiment 1 of the constant pressure automatic vacuum refreshing tank of the present invention;

FIG. 2 is a three-dimensional exploded view of the constant pressure automatic vacuum refreshing tank of the present invention in accordance with embodiment 1;

FIG. 3 is a schematic view showing the gas circuit connection of the inner lid of the constant pressure automatic vacuum fresh-keeping tank of embodiment 1 of the present invention;

FIG. 4 is a schematic view of a pressure relief device of the constant pressure automatic vacuum fresh-keeping tank of the present invention in embodiment 1;

FIG. 5 is a schematic diagram of the components of the constant pressure automatic vacuum refreshing tank of the present invention in accordance with example 6;

FIG. 6 is an exploded perspective view of the constant pressure automatic vacuum refreshing tank of the present invention in accordance with embodiment 6;

FIG. 7 is a schematic view of the vent hole of the inner lid of the constant pressure automatic vacuum refreshing tank of embodiment 6 of the present invention;

FIG. 8 is a graph of the operating current and vacuum level and pumping flow rate of a vacuum pump;

fig. 9 is a schematic diagram of a vacuum pump load current detection circuit of the present invention;

Fig. 10 is a circuit block diagram of the present invention.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Example 1

As shown in fig. 1, the present embodiment provides a constant pressure automatic vacuum refreshing tank with adjustable negative pressure, which comprises an upper cover 101 and a tank 102, wherein the upper cover 101 is fastened on the top of the tank 102 and sealed by a sealing rubber ring 103, so that the tank 102 forms an airtight space.

As shown in fig. 2 to 4, the upper cover 101 includes a small cover 104, an upper case 105, and an inner cover 106. An upper shell outlet 107 is formed in the upper shell 105, and an upper rubber ring 108 is arranged at the root of the outer side of the upper shell outlet 107; the small cover 104 is made of transparent or semitransparent materials, is buckled above the upper shell outlet 107, and is provided with a magnet 109 on the side surface, and an upper rubber ring 108 is matched with the upper shell outlet 107 and the small cover 104, so that the small cover 104 can hermetically seal the upper shell outlet 107; a sealing rubber ring 103 is arranged on the outer side of the inner cover 106, and the sealing rubber ring 103 is matched with the outer side of the inner cover 106 and the opening part of the tank body 102, so that the inner cover 106 is embedded into the upper shell in an airtight manner and the opening part of the tank body 102 is sealed in an airtight manner; an inner cover outlet 110 is arranged on one side of the inner cover 106 corresponding to the upper shell outlet 107, a middle rubber ring 111 is arranged at the inner cover outlet 110 and the upper shell outlet 107, and the middle rubber ring 111 is matched with the upper shell outlet 107 and the inner cover outlet 110, so that the upper shell 101 and the inner cover 106 are airtight at the outlets.

A battery 112, a vacuum pump 113, a control circuit 114 and a pressure relief device 115 are arranged above the other side of the inner cover 106, two vent holes 116 are also arranged on the inner cover 106, and a power switch, a charging port, a Hall sensing switch 118 and a negative pressure switch 117 are arranged on the control circuit 114. The hall sensor switch 118 is provided near the magnet 106 on the small lid 104, the battery 112 and the vacuum pump 113 are electrically connected to the control circuit 114, the vacuum pump 113 and the negative pressure switch 117 are connected to the vent hole 116 in an air path, and the vacuum pump 113 has a check function or a check valve (not shown) is provided at the front end of the vacuum pump.

The pressure relief device comprises a pressure relief button 122, an O-shaped ring 119, a pressure lever 120 and a spring 121, wherein the O-shaped ring 119 and the spring 121 are respectively sleeved at two ends of the pressure lever 120, the pressure relief button 122 is sleeved at the outer side of the pressure lever 120, and the O-shaped ring 119 is pressed against the outlet of the pressure relief device by the spring 121, so that the outlet of the pressure relief device is airtight.

Referring to the working current, the vacuum degree and the exhaust flow diagram of the vacuum pump in fig. 8, it can be seen that the output gas flow of the vacuum pump is gradually reduced along with the gradual increase of the vacuum negative pressure, the working power of the vacuum pump is gradually increased from the beginning to the maximum power point, the working power of the vacuum pump starts to be gradually reduced along with the gradual increase of the vacuum negative pressure after the maximum power point is reached, and the two sections of broken lines are close to linearity.

In the working process, a current limiting resistance circuit for detecting current flowing through a vacuum pump detects a current ADC sampling value and a power supply voltage ADC sampling value detected by a main control MCU according to a known figure 8, the output power value of the vacuum pump motor can be calculated, the change curve of the vacuum negative pressure of load gas after the vacuum pump motor starts to be started is restored, the vacuum negative pressure of the load is reversely pushed by the corresponding output power value of the vacuum pump motor detected by the main control MCU according to the known figure 8, the power supply is turned off when the preset vacuum negative pressure is reached, and automatic stop is realized.

As shown in fig. 9 to 10, the control circuit includes: the vacuum pump load current detection circuit is connected with the master control MCU; the control circuit is also provided with a voltage detection circuit which can detect whether the battery power reaches the lower limit or not and prompt a user to charge and compensate the parameters in time; the control circuit is also provided with a charging input interface, a vacuum pump interface and driving circuit, a vacuum pump load current detection circuit, an electric quantity and gear indicator lamp, a buzzer and driving circuit, a key switch, a UART communication interface, a battery charging management circuit and a battery protection circuit; the key switch can be provided with a plurality of different gears corresponding to different preset vacuum degrees; the electric quantity and gear indicator lamp can be used for indicating the electric quantity and the working gear and setting the vacuum pump to work in different vacuum negative pressure modes; the buzzer and the driving circuit can provide good human-computer interaction experience; the UART upper computer communication interface circuit can realize the output interaction and function expansion of working data; the power management circuit comprises a battery charging management circuit, a battery protection circuit and a lithium battery, and is used for preventing overcharge and discharge and output overcurrent of the battery and protecting the battery and a working circuit.

when the constant-voltage automatic vacuum fresh-keeping tank is used, food to be kept fresh is filled into the tank body, the upper cover is buckled on the tank body, a power supply is switched on, different preset negative pressure gears (negative pressure high values) are selected when the tank leaves a factory, the small cover is buckled at the outlet of the upper shell, the Hall induction switch is triggered by the magnet, and the vacuum pump works; the inner cover and the tank body are airtight due to the sealing rubber ring, the inner cover and the upper shell are airtight due to the middle rubber ring, the small cover and the upper shell are airtight due to the upper rubber ring, and the whole tank body becomes an airtight vacuum cavity; the vacuum pump pumps out air in the tank body through the vent hole, and the whole upper cover is pressed tightly by external air pressure; the control circuit is powered off after detecting the upper limit value of the negative pressure, the vacuum pump stops working, and the vacuum pump or the check valve with the check function prevents the external gas from returning to the tank body, so that the inside of the tank body is vacuumized.

after a period of time, the vacuum degree gradually decreases, the negative pressure switch is switched on after detecting the negative pressure lower limit value, the vacuum pump repeatedly works, and the vacuum degree rises to the upper limit value to stop pumping; the circulation keeps the vacuum degree in the tank body in a set interval for a long time.

when food needs to be taken out, the pressure relief button is pressed, the O-shaped ring leaves the outlet of the pressure relief device, the airtight state is relieved, external air enters, the small cover is pulled out, the tank body is inclined, and the food is poured out from the outlet.

Example 2

The difference with embodiment 1 lies in that only one negative pressure high value is preset when leaving the factory, the use is more concise, and only a power supply needs to be switched on, and the small cover is buckled, so that the automatic air extraction and the automatic constant voltage can be realized.

Example 3

Compared with the embodiment 2, the pressure relief device is simpler in use and realizes one-key air suction and air release because the pressure relief device is an electromagnetic valve, the electromagnetic valve is connected with the control circuit through a circuit, and the air path is connected with the vent hole.

Example 4

The difference with embodiment 1 is that the air extractor does not comprise a Hall sensing switch, and after the small cover is arranged at the outlet of the upper shell, the power switch is manually turned on to extract air.

Example 5

the difference from the example 1 is that the upper cover is also provided with a detachable charcoal box cover (positioned below the inner cover), the charcoal box cover is densely distributed with air holes, and functional substances such as active carbon, drying agent, zeolite and the like are filled in the charcoal box cover, so that a further fresh-keeping function is realized.

Example 6

As shown in fig. 5-7, the present embodiment provides another constant pressure automatic vacuum refreshing tank with adjustable negative pressure, which comprises an upper cover 201 and a tank 202, wherein the upper cover 201 is fastened on the top of the tank 202 and sealed by a sealing rubber ring 203, so that the tank 202 forms an airtight space. The upper cover 201 comprises an upper shell 204, an inner cover 205, and a sealing rubber ring 203 is fitted to the outer side of the inner cover 205 and the mouth of the can 202, so that the inner cover 205 can hermetically close the mouth of the can 202. A battery 206, a vacuum pump 207, a control circuit 208 and an electromagnetic valve 209 are arranged above the inner cover 205, and three vent holes 210 are arranged on the inner cover 205. The control circuit 208 is provided with a power switch, a charging port and a negative pressure switch 211, the battery 206 and the air pump 207 are electrically connected with the control circuit 208, the vacuum pump 207, the negative pressure switch 211 and the electromagnetic valve 209 are all in air path connection with a vent hole 210, and the front end of the vacuum pump 207 is also provided with a check valve (not shown). The charcoal box 212 is detachably arranged below the inner cover 205, and air holes are densely distributed on the charcoal box 212.

When the constant-pressure automatic vacuum fresh-keeping tank is used, food to be kept fresh is filled into the tank body, the upper cover is buckled on the tank body, a power supply is switched on, and the vacuum pump works; the inner cover and the tank body are airtight due to the sealing rubber ring, and the whole tank body becomes an airtight vacuum cavity; the vacuum pump pumps out air in the tank body through the vent hole, and the whole upper cover is pressed tightly by external air pressure; the control circuit is powered off after detecting the upper limit value of the negative pressure, the vacuum pump stops working, and the vacuum pump or the check valve with the check function prevents the external gas from returning to the tank body, so that the inside of the tank body is vacuumized. After a period of time, the vacuum degree is gradually reduced, the negative pressure switch is connected with the power supply after detecting the negative pressure lower limit value, the vacuum pump works repeatedly, and the vacuum degree in the tank body is kept in the set interval for a long time in such a circulating way. If the preservation effect needs to be enhanced, the carbon box is detached, the activated carbon, the drying agent and the like are placed in the carbon box, and the inner cover is installed again, so that the drying in the tank body can be further maintained;

When food needs to be taken out, the power supply is started, the electromagnetic valve is opened, the air passage inside and outside the tank body is communicated, external air enters, the airtight state is relieved, and the food can be taken out by taking out the upper cover.

Example 7

The difference from example 6 is that the pressure relief device in example 1 was used as the pressure relief device.

In embodiments 1 to 7, the control circuit may take various forms, as long as the start and stop of the vacuum pump can be controlled according to the vacuum degree fed back by the vacuum pump load current detection circuit or the negative pressure switch, for example, the start and stop of the upper and lower vacuum degree limits can be controlled by using a double negative pressure switch, the start and stop can be controlled by using a negative pressure sensor, or the start and stop can be controlled by using a single negative pressure switch to detect the lower vacuum degree limit + a circuit to detect the current of the air pump to the upper vacuum degree setting limit.

As shown in fig. 10, the control circuit includes a main control module, and the periphery of the main control module is connected with a touch key, a negative pressure switch interface, a vacuum pump driving circuit, a load current detection circuit, a battery protection circuit, a charging management circuit, an electric quantity and working indicator lamp, and a buzzer.

Compared with the prior art, the vacuum refreshing tank disclosed by the application is always kept in a vacuum state in a power supply maintaining period, and the refreshing time of food in a container can be prolonged; the vacuum degree (negative pressure value) is adjustable; for a user, only 2-3 parts (assemblies) are provided, the use is simple, the cover is closed automatically or manually, one key is used for vacuumizing, the automatic stop is realized, and one key is used for releasing the vacuum; the tank body for containing food has no accessories and is convenient to clean.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. the utility model provides an automatic vacuum refreshing jar of negative pressure adjustable constant voltage, its characterized in that, includes upper cover, a jar body, the upper cover lock closes jar body top, the upper cover with be equipped with sealed rubber ring between the jar body, make jar body forms to airtight space, be equipped with vacuum pump, power, negative pressure detection device, control circuit and pressure relief device in the upper cover, vacuum pump, power and negative pressure detection device all with control circuit connects.

2. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 1, wherein: the negative pressure detection device is a negative pressure switch or a negative pressure sensor.

3. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 1, wherein: the control circuit is provided with a master control MCU, a vacuum pump load current detection circuit connected with the master control MCU and a current limiting resistance circuit for detecting current flowing through the vacuum pump, the vacuum negative pressure of the reverse thrust load is calculated by detecting a current ADC sampling value and a power supply voltage ADC sampling value, and the power supply is turned off when the preset vacuum negative pressure is reached, so that automatic stop is realized.

4. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 1, wherein: the upper cover includes epitheca and inner cup, the epitheca is located the inner cover is covered, the epitheca is connected with the inner cup is airtight, the inner cup outer fringe with be equipped with between the jar body sealed rubber ring, vacuum pump, power, control circuit and pressure relief device locate inner cup one side top, be equipped with at least one air vent in the inner cup, vacuum pump, negative pressure detection device and pressure relief device all with the air vent is connected or is connected through the tee bend.

5. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 4, wherein: the pressure relief device comprises a pressure relief button, an O-shaped ring, a pressure lever and a spring, wherein the O-shaped ring and the spring are respectively sleeved at two ends of the pressure lever, the pressure relief button is sleeved at the outer side of the pressure lever, and the spring pushes the O-shaped ring at the outlet of the pressure relief device.

6. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 4, wherein: the pressure relief device is an electromagnetic valve, and the electromagnetic valve is electrically connected with the control circuit.

7. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 4, wherein: the vacuum pump has a non-return function or the front end of the vacuum pump is provided with a non-return valve, and the negative pressure detection device is a negative pressure switch or a negative pressure sensor.

8. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 7, wherein: the upper cover is also provided with a small cover, the upper shell is provided with an upper shell outlet, the bottom of the outer side of the upper shell outlet is provided with an upper rubber ring, the small cover is buckled with the upper shell outlet, and the upper rubber ring is matched with the small cover, so that the small cover and the upper shell are airtight; the side surface of the small cover is provided with a magnet, the control circuit is provided with a Hall sensing switch or a reed switch, and the Hall sensing switch or the reed switch is electrically connected with the control circuit; and an inner cover outlet is formed in one side of the inner cover, corresponds to the upper shell outlet, and is airtight at the joint of the inner cover outlet and the upper shell outlet through a middle rubber ring.

9. The constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure as claimed in claim 8, wherein: the upper shell is provided with a microswitch or a photoelectric switch at one side close to the small cover, the microswitch or the photoelectric switch is pressed when the small cover is sleeved on the upper shell, and the microswitch or the photoelectric switch is electrically connected with the control circuit.

10. the constant pressure automatic vacuum fresh-keeping tank with adjustable negative pressure according to any one of claims 8 to 9, characterized in that: the upper cover further comprises a charcoal box cover, and the charcoal box cover is detachably arranged below the inner cover.