WO2022022285A1

WO2022022285A1 - Pressure limiting valve applied to vacuum fresh-keeping machine

Info

Publication number: WO2022022285A1
Application number: PCT/CN2021/106263
Authority: WO
Inventors: 周义允
Original assignee: 厦门优尔智能科技股份有限公司
Priority date: 2020-07-30
Filing date: 2021-07-14
Publication date: 2022-02-03
Also published as: CN212718229U

Abstract

A pressure limiting valve applied to a vacuum fresh-keeping machine, relating to the technical field of pressure valves. The pressure limiting valve comprises a valve body (1), an upper valve cover (2) and a valve core rod (3). An air inlet channel (11) is provided in one side of the valve body (1), the upper valve cover (2) is fixedly arranged at the upper end of the valve body (1), an air outlet channel (12) is provided in the lower end of the valve body (1), and the valve core rod (3) is provided in the valve body (1) in an up-down movable mode by means of a connecting assembly and is used for opening or closing the air outlet channel (12). The pressure limiting valve can be mounted in a vacuum fresh-keeping machine, so that a negative pressure value in a fresh-keeping container can be effectively controlled when the vacuum fresh-keeping machine is vacuumized; thus, the vacuum container is prevented from being shrunk and deformed, and the pressure limiting valve has the advantages of simple structure, ingenious design, good practicability, wide application range, etc.

Description

A pressure limiting valve suitable for vacuum fresh-keeping machine

technical field

The utility model relates to the technical field of pressure valves, in particular to a pressure limiting valve suitable for a vacuum fresh-keeping machine.

Background technique

The new product of vacuum fresh-keeping machine in recent years, its main principle is to use a vacuum pump to extract the air in the fresh-keeping container (such as fresh-keeping bag and fresh-keeping box, etc.) effect. However, most of the existing vacuum fresh-keeping machines are not equipped with a pressure limiting device. When vacuuming, the negative pressure value in the fresh-keeping container cannot be effectively controlled, so the fresh-keeping container is easily deformed due to the excessive pressure difference between the inside and outside, and there is a certain safety hazard. .

The utility model provides a pressure limiting valve suitable for a vacuum fresh-keeping machine, the main purpose of which is to solve the above problems.

The utility model adopts the following technical solutions.

A pressure limiting valve suitable for a vacuum fresh-keeping machine, comprising a valve body, an upper valve cover and a valve core rod; one side of the valve body is provided with an air inlet channel, the upper end of the valve body is fixed with the above-mentioned upper valve cover, and the valve body The lower end of the valve is provided with an air outlet channel; the valve core rod can be movably arranged up and down in the valve body through the connecting assembly to open or close the air outlet channel.

Further, the above-mentioned connection assembly includes a support pad, an elastic sealing plate, a spring and a fixed plate; the above-mentioned fixed plate is fixed in the valve body, and the middle of the fixed plate is provided with a hole for the above-mentioned valve core rod to pass up and down; the upper end of the above-mentioned valve core rod The above-mentioned elastic sealing plate is connected to the valve body, and the valve core rod is provided with the above-mentioned support pad on the upper end of the elastic sealing plate, and the above-mentioned spring is sleeved between the elastic sealing plate and the fixed plate to make it move up and down.

Further, the outer peripheral edge of the above-mentioned elastic sealing plate is provided with a flange extending downward; the inner side wall of the above-mentioned upper valve cover is provided with an annular stepped surface, the upper end surface of the above-mentioned valve body is provided with an annular groove, and the above-mentioned annular stepped surface and The annular groove forms a cavity for mounting the above-mentioned flanging.

Still further, the upper valve cover is provided with a plurality of ventilation through holes above the elastic sealing plate.

Furthermore, the elastic sealing plate is provided with at least one annular groove.

Furthermore, the valve core rod is provided with an annular concave portion on the upper end of the elastic sealing plate, and the support pad is assembled in the annular concave portion.

Still further, the valve core rod and the elastic sealing plate are integrally made of silicone material.

Further, the pressure limiting valve also includes a lower valve cover threadedly connected to the lower end of the valve body; the lower end of the valve core rod is provided with a hemispherical plug; the middle of the lower valve cover is provided with the above-mentioned air outlet channel, and the air intake of the air outlet channel The mouth is in the shape of a trumpet which is adapted to the above-mentioned plug.

Furthermore, a gasket is provided between the valve body and the lower valve cover.

Further, the upper end of the valve body is provided with an annular boss, the lower end of the upper valve cover is provided with a recessed portion that fits with the annular boss, and the upper valve cover is locked to the annular boss by bolts.

Compared with the prior art, the utility model has the following beneficial effects.

1. The utility model can be installed in a vacuum fresh-keeping machine, so that it can effectively control the negative pressure value in the fresh-keeping container when vacuuming, thereby avoiding the collapse and deformation of the vacuum container, and has the advantages of simple structure, ingenious design and practicality. good and wide application.

2. The connecting assembly of the present invention has a simple structure and a compact layout, and can drive, guide and support the up and down movement of the valve core rod, so that the valve core rod can flexibly and automatically open and close the air outlet channel, thereby effectively controlling the valve core rod. pressure inside the valve.

3. The utility model can fine-tune the height between the plug and the air inlet of the air outlet channel in the reset state by adjusting the lower valve cover up and down, so as to realize the adjustability of the negative pressure limit value in the valve body, so that the pressure of the pressure limiting valve can be adjusted. The control is more flexible and reliable.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

FIG. 2 is a schematic cross-sectional view of the utility model.

In the figure: 1. Valve body; 11. Air inlet channel; 12. Air outlet channel; 13. Annular groove; 14. Annular boss; 2. Upper valve cover; 20. Ventilation through hole; 21. Annular stepped surface; 22 , give way to recess; 3, valve core rod; 30, plug; 31, support pad; 311, annular recess; 32, elastic sealing plate; 321, flange; 322, annular groove; 33, spring; 34, fixed plate; 341, give way hole; 4, lower valve cover; 5, gasket.

detailed description

The specific embodiments of the present invention will be described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be practiced without these details.

1 and 2, a pressure limiting valve suitable for a vacuum preservation machine includes a valve body 1, an upper valve cover 2 and a valve core rod 3; The upper end of the valve body 1 is fixedly provided with an upper valve cover 2, and the lower end of the valve body 1 is provided with an air outlet channel 12; The pressure limiting valve is installed in the vacuum fresh-keeping machine, so that the air inlet channel 11 is connected to the fresh-keeping container, and the air outlet channel 12 is connected to the air inlet of the vacuum pump. When vacuuming, as the air in the fresh-keeping container is continuously drawn out, The negative pressure value in the fresh-keeping container and in the valve body 1 will gradually increase, and an adsorption force will be generated at the air outlet channel 12. Under the action of the adsorption force, the valve core rod 3 will move downward to block the air inlet of the air outlet channel 12. , so as to close the air outlet channel 12, thereby controlling the negative pressure value in the vacuum container within an appropriate range to prevent its deformation and damage. After the vacuum pump stops working, the adsorption force at the outlet passage 12 disappears, and the valve core rod 3 is reset under the action of the connecting assembly, thereby opening the outlet passage and forming a passage in the valve body 1 . It can be seen that the utility model can effectively control the negative pressure value in the fresh-keeping container during vacuuming, thereby avoiding the deflation and deformation of the vacuum container, and has the advantages of simple structure, ingenious design, good practicability and wide application range.

1 and 2, the connection assembly includes a support pad 31, an elastic sealing plate 32, a spring 33 and a fixing plate 34; the fixing plate 34 is fixed in the valve body 1, and the middle of the fixing plate 34 is provided with a valve core rod 3 up and down Passing-through hole 341; the upper end of the valve core rod 3 is connected to the valve body 1 through the elastic sealing plate 32, and the valve core rod 3 is provided with a support pad 31 on the upper end of the elastic sealing plate 32, and between the elastic sealing plate 32 and the fixing plate A spring 33 is set between the 34 to make it move up and down. Preferably, the valve core rod 3 is provided with an annular concave portion 311 at the upper end of the elastic sealing plate 32 , and the support pad 31 is assembled in the annular concave portion 311 . The surrounding edges of the elastic sealing plate 32 are sealed and connected to the valve body 1, so that a closed space can be formed between the lower end and the valve body 1. When the adsorption force at the air outlet channel 12 is greater than the pulling force of the spring 33, the valve core rod 3 will be in the valve body 1. Under the action of the adsorption force, it moves downward to block the air inlet of the air outlet channel 12 ; when the adsorption force at the air outlet channel 12 disappears, the valve core rod 3 will rebound and reset under the driving of the spring 33 . Because the elastic sealing plate 32 has elastic force, it can be stretched or contracted under the action of the valve core rod 3, and can cooperate with the support pad 31 and the fixing plate 34 to jointly play the role of fixing, guiding and supporting, ensuring that the valve core rod 3 can be It moves vertically above the air outlet channel 12 . It can be seen from this that the connecting assembly of the present invention has a simple structure and a compact layout, and can drive, guide and support the up and down movement of the valve core rod 3, so that the valve core rod 3 can flexibly and automatically open and close the air outlet channel 12. , and then effectively control the pressure in the valve.

1 and 2, the outer peripheral edge of the elastic sealing plate 32 is provided with a flange 321 extending downward; the inner side wall of the upper valve cover 2 is provided with an annular stepped surface 21, and the upper end surface of the valve body 1 is provided with an annular groove 13 , and the annular stepped surface 21 and the annular groove 13 form a cavity for installing the flange 321 . Such a design can ensure the tightness between the lower end of the elastic sealing plate 32 and the valve body 1, and prevent the valve body 1 from leaking, thereby effectively improving the accuracy and sensitivity of the pressure limiting valve. In order to avoid the occurrence of vacuum stroke between the top of the elastic sealing plate 32 and the upper valve cover 2, the upper valve cover 2 is provided with several ventilation through holes 20 above the elastic sealing plate 32, thereby ensuring that the elastic sealing plate 32 can be deformed, so that the valve The mandrel 3 can move up and down smoothly.

1 and 2 , the elastic sealing plate 32 is provided with at least one annular groove 322 , and the annular groove 322 can ensure that the elastic sealing plate 32 has sufficient deformability, so that the valve core rod 3 can move up and down smoothly.

1 and 2, as a preferred solution: the valve core rod 3 and the elastic sealing plate 32 are integrally made of silicone material, thereby ensuring the structural strength between the two, making the overall structure of the pressure limiting valve more stable and reliable.

1 and 2, the pressure limiting valve also includes a lower valve cover 4 threadedly connected to the lower end of the valve body 1; the lower end of the valve core rod 3 is provided with a hemispherical plug 30; the middle of the lower valve cover 4 is provided with an air outlet channel 12 , and the air inlet of the air outlet passage 12 has a trumpet-shaped structure adapted to the plug 30 . By adjusting the lower valve cover 4 up and down, the height between the plug 30 and the air inlet of the air outlet passage 12 in the reset state can be fine-tuned, so as to realize the adjustability of the negative pressure limit value in the valve body 1, so that the pressure of the pressure limiting valve can be controlled More flexible and reliable. In order to ensure the sealing performance in the valve body 1 , a gasket 5 is provided between the valve body 1 and the lower valve cover 4 .

1 and 2, the upper end of the valve body 1 is provided with an annular boss 14, the lower end of the upper valve cover 2 is provided with a recess 22 that matches the annular boss 14, and the upper valve cover 2 is locked by bolts on the annular boss 14 . Such a design can realize a reliable connection between the valve body 1 and the upper valve cover 2, thereby ensuring the stability and reliability of the structure.

The above are only specific embodiments of the present utility model, but the design concept of the present utility model is not limited to this, and any non-substantial changes to the present utility model by using this concept should be regarded as acts that infringe the protection scope of the present utility model.

Claims

A pressure limiting valve suitable for a vacuum fresh-keeping machine is characterized in that: it comprises a valve body, an upper valve cover and a valve core rod; one side of the valve body is provided with an air inlet channel, and the upper end of the valve body is fixed with In the upper valve cover, the lower end of the valve body is provided with an air outlet channel; the valve core rod can be movably arranged in the valve body up and down through the connecting assembly to open or close the air outlet channel.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 1, characterized in that: the connecting component comprises a support pad, an elastic sealing plate, a spring and a fixing plate; the fixing plate is fixed in the valve body, And the middle part of the fixing plate is provided with a vacant hole for the valve core rod to pass up and down; the upper end of the valve core rod is connected to the valve body through the elastic sealing plate, and the valve core rod is provided with the support on the upper end of the elastic sealing plate The spring is sleeved between the elastic sealing plate and the fixing plate to make it move up and down.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 2, characterized in that: the outer peripheral edge of the elastic sealing plate is provided with a flange extending downward; the inner side wall of the upper valve cover is provided with a An annular stepped surface, the upper end surface of the valve body is provided with an annular groove, and the annular stepped surface and the annular groove form a cavity for installing the flange.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 3, wherein the upper valve cover is provided with a plurality of ventilation through holes above the elastic sealing plate.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 2, wherein the elastic sealing plate is provided with at least one annular groove.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 2, wherein the valve core rod is provided with an annular concave portion at the upper end of the elastic sealing plate, and the support pad is assembled in the annular concave portion Inside.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to any one of claims 2 to 6, wherein the valve core rod and the elastic sealing plate are integrally made of silicone material.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 1, further comprising a lower valve cover threadedly connected to the lower end of the valve body; the lower end of the valve core rod is provided with a hemispherical plug ; The middle part of the lower valve cover is provided with the air outlet channel, and the air inlet of the air outlet channel is in a trumpet-shaped structure adapted to the plug.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 8, wherein a sealing gasket is arranged between the valve body and the lower valve cover.
A pressure limiting valve suitable for a vacuum fresh-keeping machine according to claim 1, characterized in that: an annular boss is provided on the upper end of the valve body, and a lower end of the upper valve cover is provided with the annular boss A matching recess is provided, and the upper valve cover is fastened to the annular boss by bolts.