Pressure balancing device

Abstract

The utility model belongs to the technical field of storage tank force balancing, and particularly relates to a pressure balancing device which comprises a connector. The pressure relief cylinder is connected to the top of the connector; a shielding ring is fixed on the inner wall of the pressure relief cylinder; the overpressure pressure relief piece is arranged in the pressure relief cylinder and comprises a lifting cylinder, a limiting plate fixed in the middle of the lifting cylinder and a counterweight cylinder connected to the top of the lifting cylinder; the negative pressure relief piece is arranged in the lifting cylinder; wherein a first communicating hole and a second communicating hole are formed in the side wall of the lifting cylinder; and a third communicating hole is formed in the limiting plate. By arranging the connector, the pressure relief cylinder, the overpressure pressure relief piece, the negative pressure pressure relief piece and other parts, bidirectional intelligent adjustment of overpressure and negative pressure of the storage tank is achieved, meanwhile, the characteristics of pollution prevention, adjustable threshold value, easy maintenance and the like are considered, and safe use of the storage tank in different environments is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of storage tank force balance, specifically relates to a pressure balance device. BACKGROUND

[0002] The storage tank is a common tank body for storing liquid and other materials in daily life. In the actual use process, when the temperature changes, such as sun exposure or cold night, the liquid in the storage tank will expand or contract with heat or cold, which may cause the pressure in the tank body to rise or fall rapidly. When the pressure in the tank body rises to form overpressure, it will cause the weld to crack, the tank top to deform or even explode; when the pressure in the tank body decreases to form negative pressure, the tank body may be crushed by atmospheric pressure, which will affect the normal use of the storage tank. In addition, when the liquid in the tank body is pumped out, the pressure in the tank body will decrease and form negative pressure, which will affect the pumping of the liquid in the tank body.

[0003] In the prior art, a device for balancing the pressure inside and outside the tank body is disclosed, such as the patent CN215555638U discloses a pressure relief cover and liquid storage tank, which comprises a cover body, a movable blocking piece and an elastic piece, the top wall of the cover body is provided with a pressure relief hole, the movable blocking piece is located on the inner side of the top wall of the cover body, there is a gap between the movable blocking piece and the side wall of the cover body, a limiting piece is arranged in the cover body, the limiting piece is located on the side of the movable blocking piece away from the top wall of the cover body, and the elastic piece is pressed between the limiting piece and the movable blocking piece. The elastic piece can press the movable blocking piece on the top wall of the cover body to close the pressure relief hole. When the pressure inside the pressure relief cover is less than the pressure outside the pressure relief cover, the atmospheric pressure on the outside can exert a force on the movable blocking piece, so that the movable blocking piece moves, the space inside the pressure relief cover can communicate with the outside through the gap between the movable blocking piece and the side wall of the cover body and the pressure relief hole, and the purpose of releasing negative pressure is achieved.

[0004] It is undeniable that the pressure relief cover and liquid storage tank disclosed in the patent can achieve the above effects, but it still has some deficiencies: the movable blocking piece is located in the cover body and above the limiting piece, and the assembly and disassembly are not variable, and since the weight of the movable blocking piece is fixed, it is not convenient to adjust the pressure relief threshold according to the actual needs of the storage tank. In addition, in the actual application process, the storage tank also has the situation that the internal pressure rises to form overpressure, and the device can only release negative pressure, but cannot release overpressure, so there is a certain deficiency in the scope of application.

[0005] The information disclosed in this BACKGROUND section is only intended to increase the understanding of the general background of the present utility model, and should not be considered as acknowledging or implying in any form that this information constitutes prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model discloses a pressure balance device, to solve the problem of pressure relief cover and liquid storage tank in the background art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A pressure balance device, comprising:

[0009] A hollow connector;

[0010] A pressure relief cylinder is screwed on the top of the connector, and a pressure relief hole is formed in the side wall of the pressure relief cylinder; a shielding ring is fixed to the inner wall of the pressure relief cylinder below the pressure relief hole;

[0011] An overpressure relief component is arranged in the pressure relief cylinder, comprising a lifting cylinder penetrating through the shielding ring and having an outer wall adhering to the inner wall of the shielding ring, a limiting plate horizontally fixed to the middle part of the lifting cylinder, and a counterweight cylinder connected to the top of the lifting cylinder and limited to the top of the pressure relief cylinder; wherein a first communication hole is formed in the side wall of the lifting cylinder above the limiting plate, a second communication hole is formed in the side wall of the lifting cylinder below the limiting plate, and when the counterweight cylinder is at the initial position, the second communication hole is shielded by the shielding ring; a third communication hole is formed in the limiting plate;

[0012] A negative pressure relief component is arranged in the lifting cylinder.

[0013] As a preferred, the negative pressure relief component comprises a shielding plate below the limiting plate, a guide column fixed to the top of the shielding plate and vertically penetrating through the middle part of the limiting plate, a counterweight block connected to the top of the guide column, and a return spring sleeved on the top of the guide column and abutting against the counterweight block and the limiting plate at the bottom; wherein the diameter of the shielding plate is smaller than that of the limiting plate and the third communication hole is shielded.

[0014] As a preferred, the inner wall of the top of the pressure relief cylinder is provided with an annular accommodating groove corresponding to the counterweight cylinder, and when the counterweight cylinder is at the initial position, the counterweight cylinder abuts against the bottom wall of the accommodating groove; the outer wall of the lifting cylinder adheres to the inner wall of the shielding ring and has a gap with the inner wall of the pressure relief cylinder.

[0015] As a preferred, a limiting ring is fixed to the bottom outer wall of the lifting cylinder, and when the counterweight cylinder moves upward by a distance, the limiting ring abuts against the bottom of the shielding ring, and the shielding ring and the second communication hole are staggered.

[0016] As a preferred, a threaded groove is arranged at the top of the connector; a breathable film is arranged at the bottom of the pressure relief cylinder, and when the pressure relief cylinder is screwed, the breathable film is tightly abutted against the bottom wall of the threaded groove.

[0017] As a preference, the counterweight and the guide post are threadedly engaged.

[0018] As a preference, the pressure balancing device further comprises a protective shell, the connecting head bottom penetrates through the bottom wall of the protective shell and is threadedly engaged therewith; the top of the protective shell is provided with a transparent plate, and the fourth communication hole is formed in the transparent plate.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] (1) The overpressure and negative pressure double-mode pressure balancing can be realized by the overpressure relief member and the negative pressure relief member, wherein when the internal pressure of the storage tank is too high, the lifting cylinder in the overpressure relief member is pushed up by the pressure, the second communication hole is communicated with the relief hole, and overpressure release is realized; when negative pressure is formed in the storage tank, the counterweight in the negative pressure relief member is pushed down by the external air pressure, the third communication hole is opened, the external air enters the tank body, and negative pressure release is realized.

[0021] (2) The breathable film is arranged, in the process of releasing negative pressure, the external air passes through the filtration of the breathable film, dust and impurities in the air can be effectively blocked, pollution of the material in the storage tank can be avoided, and the cleanliness of the stored material can be improved.

[0022] (3) The counterweight cylinder and the lifting cylinder in the overpressure relief member are threadedly engaged, and the counterweight and the guide post in the negative pressure relief member are threadedly engaged, so that the counterweight cylinder and the counterweight of appropriate weight can be selected according to actual needs, the overpressure and negative pressure trigger threshold values are adjusted, the pressure requirements of different storage tanks can be adapted, and the application range of the device is further widened.

[0023] (4) The limiting ring is arranged at the bottom of the lifting cylinder of the overpressure relief member, the excessive upward movement of the lifting cylinder can be prevented; and the reset spring in the negative pressure relief member can ensure that the shielding plate is automatically reset after negative pressure release, and long-term stable operation of the device is ensured.

[0024] (5) The utility model discloses a plurality of components such as the connecting head, the relief cylinder, the overpressure relief member and the negative pressure relief member are arranged, bidirectional intelligent adjustment of the overpressure and negative pressure of the storage tank is realized, the characteristics of anti-pollution, adjustable threshold value and easy maintenance are considered, and the safe use of the storage tank in different environments is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic view that the device of the utility model is installed on the storage tank.

[0026] Figure 2This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 3 for Figure 2 A sectional view;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a structural schematic diagram of the connector, pressure relief cylinder, overpressure relief component, and negative pressure relief component of this utility model;

[0030] Figure 6 for Figure 5 A sectional view.

[0031] Explanation of key figure labels:

[0032] 100. Connector; 101. Threaded groove;

[0033] 200. Pressure relief cylinder; 201. Pressure relief hole; 202. Shielding ring; 203. Receiving groove;

[0034] 300. Overpressure relief component; 301. Lifting cylinder; 3011. First connecting hole; 3012. Second connecting hole; 3013. Limiting ring; 302. Limiting plate; 3021. Third connecting hole; 303. Counterweight cylinder;

[0035] 400. Negative pressure relief component; 401. Baffle plate; 402. Guide post; 403. Counterweight; 404. Return spring;

[0036] 500, Protective shell; 501, Transparent plate; 5011, Fourth connecting hole;

[0037] 600. Breathable membrane;

[0038] 700. Storage tank. Detailed Implementation

[0039] The technical solution of this utility model patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] Example

[0041] See appendix Figures 1-6 A pressure balancing device, comprising:

[0042] Hollow connector 100;

[0043] A pressure relief cylinder 200 is screwed on the top of the connector 100, and a side wall of the pressure relief cylinder 200 is provided with a pressure relief hole 201; a blocking ring 202 is fixed to an inner wall of the pressure relief cylinder 200 at a position below the pressure relief hole 201;

[0044] An overpressure relief component 300 is arranged in the pressure relief cylinder 200, and includes a lifting cylinder 301 penetrating through the blocking ring 202 and abutting against an inner wall of the blocking ring 202, a limiting plate 302 horizontally fixed to a middle part of the lifting cylinder 301, and a counterweight cylinder 303 screwed on a top of the lifting cylinder 301 and limited to a top of the pressure relief cylinder 200; in this embodiment, an annular accommodating groove 203 corresponding to the counterweight cylinder 303 is arranged on an inner wall of the top of the pressure relief cylinder 200, and the counterweight cylinder 303 abuts against a bottom wall of the accommodating groove 203 when the counterweight cylinder 303 is at an initial position; in addition, a gap is formed between the outer wall of the lifting cylinder 301 and the inner wall of the pressure relief cylinder 200, and the outer wall of the lifting cylinder 301 is abutted against the inner wall of the blocking ring 202; a first communication hole 3011 is arranged on a side wall of the lifting cylinder 301 at a position above the limiting plate 302, and a second communication hole 3012 is arranged on the side wall of the lifting cylinder 301 at a position below the limiting plate 302; the second communication hole 3012 is blocked by the blocking ring 202 when the counterweight cylinder 303 is at the initial position; and a third communication hole 3021 is arranged on the limiting plate 302.

[0045] A negative pressure relief component 400 is arranged in the lifting cylinder 301, and includes a blocking plate 401 below the limiting plate 302, a guide column 402 fixed to a top of the blocking plate 401 and vertically penetrating through a middle part of the limiting plate 302, a counterweight block 403 screwed on a top of the guide column 402, and a return spring 404 sleeved on the guide column 402 and abutting against the counterweight block 403 at a top part of the guide column 402 and abutting against the limiting plate 302 at a bottom part of the guide column 402; a diameter of the blocking plate 401 is smaller than a diameter of the limiting plate 302 and the third communication hole 3021 is blocked by the blocking plate 401; and the blocking plate 401 abuts against a bottom of the limiting plate 302 in an initial state.

[0046] A protective shell 500 is provided, and a transparent plate 501 is arranged on a top of the protective shell 500, and a fourth communication hole 5011 is arranged on the transparent plate 501; and the connector 100 penetrates through a bottom wall of the protective shell 500 and is screwed with the protective shell 500.

[0047] In this embodiment, a limiting ring 3013 is fixed to an outer wall of a bottom of the lifting cylinder 301, and the limiting ring 3013 abuts against a bottom of the blocking ring 202 when the counterweight cylinder 303 moves upward by a distance, and the blocking ring 202 is misaligned with the second communication hole 3012.

[0048] Secondly, in this embodiment, a threaded groove 101 is arranged on a top of the connector 100; and a breathable film 600 is arranged on a bottom of the pressure relief cylinder 200, and the breathable film 600 is tightly abutted against a bottom wall of the threaded groove 101 when the pressure relief cylinder 200 is screwed.

[0049] In use, the protective shell 500 is fixed on the top of the storage tank 700. It is to be noted that the outer wall of the top wall of the protective shell 500 is integrally formed with a ring-shaped connecting ring (not labeled in the drawings), and the protective shell 500 is fixed on the storage tank 700 by means of bolts penetrating through the transparent plate 501 and the connecting ring. It is not difficult to understand that the bottom of the protective shell 500 extends into the interior of the storage tank 700. In addition, there is a gap between the outer wall of the protective shell 500 and the outer wall of the hollow connecting head 100 and the outer wall of the pressure relief cylinder 200, and a non-woven fabric bag containing silica desiccant is placed in the gap, so that moisture in the air entering the interior of the protective shell 500 can be absorbed, thereby avoiding the entry of moisture into the interior of the storage tank 700 when the interior and the exterior of the storage tank 700 are communicated. Of course, the non-woven fabric bag does not block the pressure relief hole 201. The pressure relief hole 201 is communicated with the exterior of the protective shell 500 through the fourth communication hole 5011 in the transparent plate 501.

[0050] Under normal circumstances, due to the self-gravity of the lifting cylinder 301 and the counterweight cylinder 303, the counterweight cylinder 303 is in the initial position, at which time the counterweight cylinder 303 abuts against the bottom wall of the accommodating groove 203, the shielding ring 202 shields the second communication hole 3012, and the interior of the storage tank 700 is isolated from the exterior. When the internal pressure of the storage tank 700 is higher than the external pressure due to external factors (such as temperature rise), the internal pressure of the storage tank 700 will generate an upward pushing force on the shielding plate 401, and the shielding plate 401 will generate an upward pushing force on the lifting cylinder 301 through the limiting plate 302. However, due to the influence of the self-gravity of the lifting cylinder 301 and the counterweight cylinder 303, the lifting cylinder 301 will not move at this time. As the internal pressure of the storage tank 700 gradually increases, the pushing force on the lifting cylinder 301 also gradually increases, and when the overpressure in the interior of the storage tank 700 reaches a certain value, the lifting cylinder 301 moves upward. After the lifting cylinder 301 moves upward by a certain distance, the shielding ring 202 and the second communication hole 3012 are misaligned (at this time, the second communication hole 3012 is located above the shielding ring 202), and the shielding ring 202 no longer shields the second communication hole 3012. The interior of the storage tank 700 is communicated with the exterior through the gap between the connecting head 100, the second communication hole 3012, the outer wall of the lifting cylinder 301 and the inner wall of the pressure relief cylinder 200, and the pressure relief hole 201, thereby releasing the overpressure in the interior of the storage tank 700. After the overpressure is released, the internal pressure of the storage tank 700 decreases, the counterweight cylinder 303 resets, and the shielding ring 202 shields the second communication hole 3012 again, isolating the interior of the storage tank 700 from the exterior.

[0051] When the negative pressure is formed inside the storage tank 700 (such as extracting the liquid in the storage tank 700), the pressure inside the storage tank 700 is lower than the outside, and the external pressure will generate a downward thrust on the counterweight 403, but the reset spring 404 has an upward thrust on the counterweight 403, so the counterweight 403 will not move at this time. As the internal pressure of the storage tank 700 gradually decreases, the thrust on the counterweight 403 also gradually increases, and when the negative pressure inside the storage tank 700 reaches a certain value, the counterweight 403 moves downward, the reset spring 404 is compressed, and the counterweight 403 drives the shutter plate 401 to move downward through the guide column 402. When the shutter plate 401 moves downward, the shutter plate 401 no longer blocks the third through hole, and the storage tank 700 inside communicates with the outside through the connecting head 100, the third through hole, the first communication hole 3011, the gap between the outer wall of the lifting cylinder 301 and the inner wall of the pressure relief cylinder 200, and the pressure relief hole 201, thereby releasing the negative pressure inside the storage tank 700. After the negative pressure is released, the pressure inside the storage tank 700 rises, the reset spring 404 stretches, the counterweight 403 resets, the shutter plate 401 abuts against the bottom of the limiting plate 302 again and blocks the third communication hole 3021, and the inside of the storage tank 700 is isolated from the outside. It should be noted that when the negative pressure is released, the external air enters the storage tank 700 through the air permeable film 600, which can filter out dust and other impurities in the air, thereby effectively preventing the material in the storage tank 700 from being contaminated.

[0052] The foregoing description of specific example embodiments of the present application is provided for the purpose of explanation and illustration. These descriptions are not intended to limit the application to the precise forms disclosed, and many modifications and variations are possible in light of the above teachings. The example embodiments were chosen and described in order to explain the principles of the application and its practical application, thereby enabling others skilled in the art to implement and utilize the application in various different example embodiments and with various different modifications and changes as are suited to the particular use contemplated. The scope of the application is defined by the following claims and their equivalents.

Claims

1. A pressure equalizing device, characterized by, The utility model relates to a pressure balance device, comprising: a hollow connector; a pressure relief cylinder screwed on the top of the connector, with a pressure relief hole in its side wall; a blocking ring fixed to the inner wall of the pressure relief cylinder below the pressure relief hole; an overpressure relief component arranged in the pressure relief cylinder, comprising a lifting cylinder penetrating through the blocking ring and having its outer wall in close contact with the inner wall of the blocking ring, a limiting plate horizontally fixed to the middle part of the lifting cylinder, and a counterweight cylinder connected to the top of the lifting cylinder and limited to the top of the pressure relief cylinder; wherein the side wall of the lifting cylinder is provided with a first communication hole above the limiting plate and a second communication hole below the limiting plate, and when the counterweight cylinder is in an initial position, the second communication hole is blocked by the blocking ring; a third communication hole is arranged on the limiting plate; a negative pressure relief component arranged in the lifting cylinder.

2. The pressure equalizing device of claim 1, wherein The negative pressure relief component comprises a blocking plate below the limiting plate, a guide column fixed to the top of the blocking plate and penetrating vertically upward through the middle part of the limiting plate, a counterweight block connected to the top of the guide column, and a return spring sleeved on the top of the guide column and abutting against the counterweight block and the limiting plate at the bottom; wherein the diameter of the blocking plate is smaller than that of the limiting plate and the third communication hole is blocked by the blocking plate.

3. The pressure equalizing device of claim 2, wherein, The top inner wall of the pressure relief cylinder is provided with an annular accommodating groove corresponding to the counterweight cylinder, and when the counterweight cylinder is in the initial position, the counterweight cylinder abuts against the bottom wall of the accommodating groove; the outer wall of the lifting cylinder is in close contact with the inner wall of the blocking ring and has a gap with the inner wall of the pressure relief cylinder.

4. The pressure equalizing device of claim 2, wherein, A limiting ring is fixed to the bottom outer wall of the lifting cylinder, and when the counterweight cylinder moves upward by a certain distance, the limiting ring abuts against the bottom of the blocking ring, and the blocking ring and the second communication hole are staggered.

5. The pressure equalizing device of claim 2, wherein, The top of the connector is provided with a threaded groove; the bottom of the pressure relief cylinder is provided with a breathable film, and when the pressure relief cylinder is screwed, the breathable film is tightly abutted against the bottom wall of the threaded groove.

6. The pressure equalizing device of claim 2, wherein, The counterweight block and the lifting cylinder are in threaded connection, and the counterweight block and the guide column are in threaded connection.

7. The pressure equalizing device of claim 2, wherein The pressure balance device further comprises a protective shell, and the bottom of the connector penetrates through the bottom wall of the protective shell and is in threaded connection therewith; the top of the protective shell is provided with a transparent plate, and the transparent plate is provided with a fourth communication hole.

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