Positive and negative pressure protector

Abstract

The utility model provides a positive and negative pressure protector, which relates to the technical field of positive and negative pressure protectors, and comprises two cylinders which are connected up and down, the upper cylinder is an upper cylinder, and the lower cylinder is a lower cylinder; the two liquid sealing structures are respectively an upper liquid sealing structure and a lower liquid sealing structure, the upper liquid sealing structure is arranged at the lower end of the upper cylinder body, and the lower liquid sealing structure is arranged at the lower end of the lower cylinder body. The air exhaust device has the advantages that the upper liquid sealing structure and the lower liquid sealing structure are arranged to form the pressure space, the upper floating cover is pushed to ascend through pressure, meanwhile, the lower floating cover is pressed to exhaust air, the upper floating cover is tensioned through negative pressure, and meanwhile the lower floating cover is drawn to ascend to suck air; the meshes are formed in the upper ends of the upper central pipe and the lower central pipe, and a distance exists between the height of the meshes and the anti-freezing liquid of the liquid seal, so that airflow cannot directly impact the anti-freezing liquid, the air resistance is small, the pressure is stable, and the anti-freezing device can be suitable for a lower pressure range.

Description

Technical Field

[0001] This utility model relates to the field of positive and negative pressure protectors, and in particular to a positive and negative pressure protector. Background Technology

[0002] Positive and negative pressure protectors are used in biogas projects to control biogas pressure within a certain range. When the biogas pressure is higher than the positive pressure limit, it automatically vents gas; when the biogas pressure is lower than the negative pressure limit, it automatically draws in gas.

[0003] Traditional positive and negative pressure protectors mostly operate on a single liquid seal principle. When the gas pressure exceeds the static pressure of the liquid, the gas overflows from below the liquid surface, automatically venting or drawing in gas. However, these protectors have the following problems when the venting or drawing in flow rates are large: First, the airflow resistance is high during venting or drawing in, causing the actual venting and drawing in pressure to be significantly higher than the static pressure of the liquid, making them unsuitable for low-pressure situations. Second, the pressure fluctuates greatly due to the violent splashing of liquid during venting and drawing in. Third, the initial venting and drawing in pressure are controlled by the liquid level, requiring precise control of the liquid level when adding liquid. Fourth, a large amount of liquid is lost each time venting or drawing in, causing a significant drop in the liquid level and even liquid seal failure, necessitating frequent checks of the liquid level and timely replenishment of liquid. Utility Model Content

[0004] In view of this, the present invention provides a positive and negative pressure protector to solve the technical problems of easy splashing of liquid seal liquid and high exhaust resistance in traditional positive and negative pressure protectors.

[0005] An embodiment of this utility model provides a positive and negative pressure protector, comprising:

[0006] The two cylinders are connected vertically, with the upper cylinder being the upper cylinder and the lower cylinder being the lower cylinder.

[0007] Two liquid sealing structures are provided, namely an upper liquid sealing structure and a lower liquid sealing structure. The upper liquid sealing structure is disposed at the lower end of the upper cylinder, and the lower liquid sealing structure is disposed at the lower end of the lower cylinder. A pressure space is formed between the upper liquid sealing structure and the lower liquid sealing structure in the lower cylinder.

[0008] The upper liquid sealing structure includes an upper central tube, an upper mesh, and an upper float cover. The open end of the upper float cover is slidably connected along the end of the upper central tube. The upper mesh is evenly distributed on the upper wall of the upper central tube for ventilation.

[0009] The bottom of both the upper cylinder and the lower cylinder contains antifreeze, and the level of the antifreeze is lower than the lowest point of the upper mesh and the lower mesh to prevent antifreeze from overflowing.

[0010] The biogas flange interface is connected to one side of the lower cylinder, allowing biogas to communicate with the pressure space. When the pressure in the pressure space is higher than the positive pressure limit, the upper floating cover in the upper liquid sealing structure is pushed upward to release pressure. When the pressure in the pressure space is lower than the negative pressure limit, the lower floating cover in the lower liquid sealing structure corresponding to the upper floating cover is adsorbed and moved upward to release pressure.

[0011] Furthermore, the upper cylinder is provided with a first guide structure, and the lower cylinder is provided with a second guide structure, the first guide structure and the second guide structure having the same structure;

[0012] The first guide structure includes a guide rod component, a first limiting beam, and a second limiting beam. The guide rod component is connected to the upper floating cover. The center of both the first limiting beam and the second limiting beam has a central hole, and the guide rod component is slidably connected to the central hole.

[0013] Furthermore, a detachable counterweight is connected to the top of the upper floating cover.

[0014] Furthermore, the guide rod component includes a single-ended screw, an internal / external thread conversion bolt, and a nut. The internal / external thread conversion bolt is disposed outside the single-ended screw and passes through the counterweight. The nut is threadedly connected to the internal / external thread conversion bolt. The nut is tightened outside the internal / external thread conversion bolt and presses the counterweight onto the float.

[0015] Furthermore, the guide rod component also includes a sealing gasket, which is disposed between the counterweight and the float cover to keep the float cover sealed.

[0016] Furthermore, the upper central tube connects the upper and lower parts of the upper liquid sealing structure, and the length of the upper floating cover is longer than the length of the upper central tube.

[0017] Furthermore, the lower liquid sealing structure includes a lower central tube, a lower mesh, and a lower float cover. The lower float cover is slidably connected to the lower central tube. The upper central tube communicates with the bottom wall of the upper cylinder and faces the inner cavity of the upper cylinder. The lower central tube communicates with the bottom wall of the lower cylinder and faces the inner cavity of the lower cylinder.

[0018] Furthermore, a drain valve is connected to one side of the bottom of the upper cylinder and the lower cylinder, and a liquid level display tube is connected to the drain valve.

[0019] Furthermore, an observation window is provided on one side of both the upper cylinder and the lower cylinder.

[0020] Furthermore, the upper end of the upper cylinder is connected to an exhaust pipe via a connecting flange, the upper part of the exhaust pipe is provided with a rain cap, and an exhaust hole is opened on the outer wall of the end of the exhaust pipe near the rain cap.

[0021] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: The positive and negative pressure protector of this utility model forms a pressure space by setting an upper liquid sealing structure and a lower liquid sealing structure. Pressure pushes the upper float to rise while simultaneously pressing the lower float to expel air. Negative pressure pulls the upper float to tighten while simultaneously pulling the lower float to rise to draw in air. Mesh openings are provided at the upper and lower central tubes. Because there is a distance between the mesh height and the liquid-sealed antifreeze, the airflow will not directly impact the antifreeze and cause splashing, thus preventing liquid splashing and eliminating the need for frequent liquid replenishment. With low air and intake resistance and good pressure control stability, the air pressure can be stabilized at a low pressure below 500 Pa even during high-flow exhaust or intake, without drastic pressure fluctuations or overpressure issues. The exhaust and intake pressures do not change with the liquid level, and the liquid level does not require precise control, as long as it exceeds the minimum liquid level. Through the design of the first and second guide structures, the accuracy of the upper and lower liquid sealing structures can be ensured, so that the upper or lower float cover maintains a certain gap with the upper and lower central tubes, preventing the float cover from sliding or shifting, which has significant advantages. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the positive and negative pressure protector of this utility model;

[0023] Figure 2 This is a schematic diagram of the liquid sealing structure on the positive and negative pressure protector of this utility model;

[0024] Figure 3 This is a schematic diagram of the liquid sealing structure of the positive and negative pressure protector of this utility model;

[0025] Figure 4 This is a diagram showing the positive pressure exhaust state of the positive and negative pressure protector of this utility model;

[0026] Figure 5 This is a diagram showing the negative pressure exhaust state of the positive and negative pressure protector of this utility model.

[0027] In the diagram: 1. Exhaust pipe; 2. Upper cylinder; 3. Upper liquid sealing structure; 301. Upper central tube; 302. Upper mesh; 303. Upper float; 304. Counterweight; 4. Lower cylinder; 5. Drain valve; 6. Liquid level display tube; 7. Lower liquid sealing structure; 701. Lower central tube; 702. Lower mesh; 703. Lower float; 8. Connecting flange; 9. Biogas flange interface; 10. Exhaust port; 11. First limiting beam; 12. Second limiting beam; 13. Central hole; 14. Guide rod component; 1401. Single-ended screw; 1402. Nut; 1403. Internal / external thread conversion bolt; 1404. Sealing gasket; 15. Second guide structure; 16. Observation window; 17. Rain cap. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0029] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0032] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0033] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Please refer to Figure 1 The present invention provides a positive and negative pressure protector, including an upper cylinder 2, a lower cylinder 4, an upper liquid sealing structure 3, a lower liquid sealing structure 7, and a biogas flange interface 9. The upper end of the upper cylinder 2 is connected to an exhaust pipe 1 through a connecting flange 8, so that the positive and negative pressure protector is divided into three assemblable sections.

[0035] In an optional embodiment, the upper part of the exhaust pipe 1 is provided with a rain cap 17, and an exhaust hole 10 is opened on the outer wall of the end of the exhaust pipe 1 near the rain cap 17. The rain cap 17 can effectively prevent rainwater from entering the exhaust pipe 1, and the exhaust hole 10 is used to discharge the gas that enters the exhaust pipe 1, further enhancing the safety and reliability of the equipment.

[0036] Please refer to Figures 1 to 3 In this embodiment, the upper cylinder 2 and the lower cylinder 4 are connected by an upper and lower sealing method. The upper liquid sealing structure 3 is installed at the lower end of the upper cylinder 2, and the lower liquid sealing structure 7 is located at the lower end of the lower cylinder 4. The two form a pressure space inside the lower cylinder 4, which serves as a space for communication with biogas.

[0037] When biogas enters through biogas flange interface 9 and connects to the pressure space, if the pressure in the pressure space is higher than the positive pressure limit, the upper liquid sealing structure 3 will be pushed upward by the pressure to achieve pressure relief; if the pressure is lower than the negative pressure limit, the lower liquid sealing structure 7 will be attracted upward by the pressure to achieve the purpose of pressurization. This design can effectively balance the pressure changes in the system and ensure the stability of equipment operation.

[0038] Please refer to Figure 3 and Figure 4 The upper liquid sealing structure 3 and the lower liquid sealing structure 7 have the same structure. The upper liquid sealing structure 3 includes an upper central tube 301, an upper mesh 302, and an upper floating cover 303. Taking the upper liquid sealing structure 3 as an example, the open end of the upper floating cover 303 can be slidably connected along the end of the upper central tube 301, while the upper mesh 302 is evenly distributed on the outer peripheral wall of the upper central tube 301 for ventilation. Thus, when the upper floating cover 303 slides up relative to the upper central tube 301 until it passes over the upper mesh 302, the gas can be smoothly connected and depressurized.

[0039] In order to seal the space between the upper liquid sealing structure 3 and the lower liquid sealing structure 7, antifreeze is contained in the bottom walls of the upper cylinder 2 and the lower cylinder 4. The antifreeze level is lower than the lowest point of the upper mesh 302 and the lower mesh 702 to prevent antifreeze from overflowing.

[0040] In this embodiment, a gap is reserved between the upper float 303 and the upper central tube 301. The gap size is controlled at 1mm. When air is drawn in or drawn out through the gap, the gas cannot be discharged or drawn in in large quantities. Therefore, the gas will push the lower end of the upper float 303 out of the liquid surface until it is above the upper mesh 302 of the upper central tube 301. In this way, the gas can be discharged or drawn in in large quantities from the upper mesh 302 of the upper central tube 301. Since the height of the upper mesh 302 is a certain distance from the liquid surface, the airflow will not have a large impact on the liquid surface, causing splashing.

[0041] To further explain, the lower liquid sealing structure 7 includes a lower central tube 701, a lower mesh 702, and a lower float 703. The lower float 703 is slidably connected to the lower central tube 701. The upper central tube 301 is connected to the bottom wall of the upper cylinder 2 and faces the inner cavity of the upper cylinder 2. The lower central tube 701 is connected to the bottom wall of the lower cylinder 4 and faces the inner cavity of the lower cylinder 4.

[0042] Furthermore, in order to better guide the sliding of the upper liquid sealing structure 3 and the lower liquid sealing structure 7 and maintain the stability of their movement, a first guide structure is provided in the upper cylinder 2 and a second guide structure 15 is provided in the lower cylinder 4, and the two structures are identical.

[0043] The first guide structure includes a guide rod component 14, a first limiting beam 11, and a second limiting beam 12. The guide rod component 14 is connected to the upper floating cover 303, and the center of the first limiting beam 11 and the second limiting beam 12 passes through the center hole 13. The guide rod component 14 is slidably connected to the center hole 13. This guide structure can effectively prevent the upper floating cover 303 from deviating or getting stuck during the sliding process, ensuring the flexibility and reliability of its operation.

[0044] In another optional embodiment, considering that the weight of the upper float 303 may need to be adjusted in practical applications to adapt to different pressure conditions, a detachable counterweight 304 is provided on the top of the upper float 303. In the structural design of the guide rod component 14, a combination of a single-ended screw 1401, an internal / external thread conversion bolt 1403, and a nut 1402 is adopted. The internal / external thread conversion bolt 1403 passes through the counterweight 304, and the nut 1402 is used to press it onto the upper float 303. This makes it easy to flexibly increase or decrease the number or weight of the counterweight 304 as needed, thereby achieving precise adjustment of the pressure relief effect.

[0045] Meanwhile, a sealing gasket 1404 is also provided between the counterweight 304 and the upper float 303 to ensure the sealing of the upper float 303 and prevent liquid leakage.

[0046] In an optional embodiment, a drain valve 5 is connected to one side of the bottom of the upper cylinder 2 and the lower cylinder 4, and a liquid level display tube 6 is connected to the drain valve 5.

[0047] In an optional embodiment, an observation window 16 is provided on one side of both the upper cylinder 2 and the lower cylinder 4.

[0048] In the actual installation process, the upper cylinder 2 and the lower cylinder 4 are first sealed together to ensure tightness. Then, the upper liquid sealing structure 3 and the lower liquid sealing structure 7 are installed respectively. The upper central tube 301 is connected to the bottom wall of the upper cylinder 2 and faces the inner cavity of the upper cylinder 2. The lower central tube 701 is connected to the bottom wall of the lower cylinder 4 and faces the inner cavity of the lower cylinder 4. At the same time, the upper float 303 and the lower float 703 are installed in the corresponding positions, ensuring that they can slide flexibly along the ends of the upper central tube 301 and the lower central tube 701. Next, according to the design requirements of the guide structure, the guide rod component 14, the first limiting beam 11, and the second limiting beam 12 are installed. The appropriate counterweight 304 is assembled according to the actual situation. The position of the counterweight 304 is fixed by adjusting the nut 1402. Finally, the biogas flange interface 9 is connected to the lower cylinder 4, and the overall debugging and sealing check are performed to ensure that the equipment can work normally.

[0049] During equipment operation, the internal conditions of the equipment can be intuitively understood by observing the observation windows 16 on one side of the upper cylinder 2 and the lower cylinder 4, such as the liquid level, the movement status of the upper float 303 and the lower float 703, etc. At the same time, the drain valve 5 connected to the bottom side and the liquid level display tube 6 connected to it facilitate the drain operation when needed, and can monitor the liquid level changes in real time to ensure that the liquid is always within a suitable height range.

[0050] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0051] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positive and negative pressure protector, characterized in that, include: Two cylinders are connected vertically, with the upper cylinder being the upper cylinder (2) and the lower cylinder being the lower cylinder (4). Two liquid sealing structures are an upper liquid sealing structure (3) and a lower liquid sealing structure (7). The upper liquid sealing structure (3) is located at the lower end of the upper cylinder (2), and the lower liquid sealing structure (7) is located at the lower end of the lower cylinder (4). A pressure space is formed between the upper liquid sealing structure (3) and the lower liquid sealing structure (7) in the lower cylinder (4). The upper liquid sealing structure (3) includes an upper central tube (301), an upper mesh (302), and an upper float (303). The open end of the upper float (303) is slidably connected along the end of the upper central tube (301). The upper mesh (302) is evenly distributed on the upper wall of the upper central tube (301) for ventilation. The lower liquid sealing structure (7) includes a lower central tube (701), a lower mesh (702), and a lower float (703). The bottom of the upper cylinder (2) and the lower cylinder (4) are both filled with antifreeze, and the level of the antifreeze is lower than the lowest point of the upper mesh (302) and the lower mesh (702) to prevent the antifreeze from overflowing. The biogas flange interface (9) is connected to one side of the lower cylinder (4) to connect the biogas with the pressure space. When the pressure in the pressure space is higher than the positive pressure limit, the upper float (303) in the upper liquid sealing structure (3) is pushed upward to release pressure. When the pressure in the pressure space is lower than the negative pressure limit, the lower float (703) in the lower liquid sealing structure (7) corresponding to the upper float (303) is adsorbed upward to release pressure.

2. The positive and negative pressure protector as described in claim 1, characterized in that: The upper cylinder (2) is provided with a first guide structure, and the lower cylinder (4) is provided with a second guide structure (15). The first guide structure and the second guide structure (15) have the same structure. The first guide structure includes a guide rod component (14), a first limiting beam (11), and a second limiting beam (12). The guide rod component (14) is connected to the upper floating cover (303). The center of the first limiting beam (11) and the second limiting beam (12) are both through a central hole (13). The guide rod component (14) is slidably connected to the central hole (13).

3. The positive and negative pressure protector as described in claim 2, characterized in that: The top of the upper float (303) is connected to a detachable counterweight (304).

4. The positive and negative pressure protector as described in claim 3, characterized in that: The guide rod component (14) includes a single-ended screw (1401), an internal / external thread conversion bolt (1403), and a nut (1402). The internal / external thread conversion bolt (1403) is disposed outside the single-ended screw (1401) and passes through the counterweight (304). The nut (1402) is threadedly connected to the internal / external thread conversion bolt (1403). The nut (1402) is tightened outside the internal / external thread conversion bolt (1403) and presses the counterweight (304) onto the float (303).

5. The positive and negative pressure protector as described in claim 4, characterized in that: The guide rod component (14) also includes a sealing gasket (1404), which is disposed between the counterweight (304) and the float (303) to keep the float (303) sealed.

6. The positive and negative pressure protector as described in claim 1, characterized in that: The upper central tube (301) connects the upper and lower parts of the upper liquid sealing structure (3), and the length of the upper floating cover (303) is longer than the length of the upper central tube (301).

7. The positive and negative pressure protector as described in claim 1, characterized in that: The lower floating cover (703) is slidably connected to the lower central tube (701), the upper central tube (301) is connected to the bottom wall of the upper cylinder (2) and faces the inner cavity of the upper cylinder (2); the lower central tube (701) is connected to the bottom wall of the lower cylinder (4) and faces the inner cavity of the lower cylinder (4).

8. The positive and negative pressure protector as described in claim 1, characterized in that: The bottom side of the upper cylinder (2) and the lower cylinder (4) is connected to a drain valve (5), and a liquid level display tube (6) is connected to the drain valve (5).

9. The positive and negative pressure protector as described in claim 1, characterized in that: Both the upper cylinder (2) and the lower cylinder (4) are provided with an observation window (16) on one side.

10. The positive and negative pressure protector as described in claim 1, characterized in that: The upper end of the upper cylinder (2) is connected to an exhaust pipe (1) via a connecting flange (8). The upper part of the exhaust pipe (1) is provided with a rain cap (17), and an exhaust hole (10) is opened on the outer wall of the end of the exhaust pipe (1) near the rain cap (17).

Images