Positive and negative pressure protector

Abstract

The utility model relates to the technical field of positive and negative pressure protectors, in particular to a positive and negative pressure protector which comprises an outer cylinder and an inner cylinder, the outer cylinder is fixedly connected with a first air pipe used for being connected with protected equipment, the inner cylinder is fixedly connected with a second air pipe used for being communicated with the atmosphere, and the inner cylinder is fixedly connected with the top of the outer cylinder. The lower portion of the inner barrel is located in the outer barrel, the inner barrel is communicated with the interior of the outer barrel through an opening in the bottom end of the inner barrel, and a plurality of triangular notches distributed around the opening are formed in the opening in the bottom end of the inner barrel. According to the utility model, the triangular notch is arranged, so that the area of the notch exposed out of the liquid level is gradually increased and the air inlet or the air outlet is gradually increased along with the gradual reduction of the liquid level of the liquid seal during air inlet or air outlet, so that the air inlet or air outlet process is more stable; and the situation of danger caused by overlarge air pressure change in the protected equipment due to the instant suction or exhaust of a large amount of air is avoided.

Description

Technical Field

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

[0002] Patent application number 202221691399.9 discloses a positive and negative pressure protector, including an air inlet cylinder, an exhaust cylinder, a protector cylinder, a liquid seal, and an automatic liquid replenishing component; the liquid seal is arranged in the protector cylinder to form positive and negative pressure protection, and the air inlet cylinder extends from the top of the positive and negative pressure protector into the inside of the protector cylinder below the liquid level of the liquid seal, and is used to discharge the gas in the protected device when the inside of the protected device is positive pressure, or to inhale gas into the protected device when the inside is negative pressure. The exhaust cylinder is arranged at the top of the positive and negative pressure protector and is connected to the protector cylinder to discharge the gas in the protected device.

[0003] The disadvantage of the above patent solution is that the positive and negative pressure protectors are unstable when inhaling and exhausting air into the protected equipment, which can easily lead to danger. Utility Model Content

[0004] The main purpose of the utility model is to provide a positive and negative pressure protector to solve the problem of instability when the positive and negative pressure protectors in the prior art are inhaling and exhausting air into the protected equipment.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an automatic fluid-replenishing positive and negative pressure protector, comprising an outer tube and an inner tube, the outer tube being fixedly connected to a first air pipe for connecting to the protected equipment, the inner tube being fixedly connected to a second air pipe for communicating with the atmosphere, the inner tube being fixedly connected to the top of the outer tube, the lower part of the inner tube being located inside the outer tube, the inner tube being connected to the interior of the outer tube through an opening at its bottom end, and the opening at the bottom end of the inner tube being provided with a plurality of triangular notches distributed around the opening.

[0006] Furthermore, the inner tube is funnel-shaped with a larger inner diameter at the upper part and a smaller inner diameter at the lower part, and the second air pipe is arranged at the top of the inner tube; by setting the inner tube into a funnel shape, the accommodation space inside the inner tube is increased, and liquid is prevented from spraying out of the second air pipe at the top of the inner tube.

[0007] Furthermore, a circular plate for preventing liquid from splashing is fixedly connected to the interior of the inner cylinder via a bracket.

[0008] Furthermore, the outer cylinder is connected to the rehydration device through a rehydration tube. A one-way valve is installed on the rehydration tube to only allow liquid to enter the outer cylinder from the rehydration device. The interface between the rehydration tube and the outer cylinder is located below the bottom opening of the inner cylinder.

[0009] Furthermore, the rehydration device includes a rehydration tank, to which a first water supply pipe is fixedly connected, and a float switch is installed on the first water supply pipe, which is controlled to open and close according to the change of the liquid level in the rehydration tank.

[0010] Furthermore, the liquid replenishing tank is fixedly connected to a second water supply pipe, and a manual switch is installed on the second water supply pipe.

[0011] The utility model provides a triangular notch. When air is taken in or out, as the liquid seal level gradually decreases, the area of ​​the notch exposed to the liquid surface gradually increases, and the air intake or exhaust port also gradually increases, making the air intake or exhaust process more stable. It avoids a large amount of air being taken in or out in an instant, which may cause excessive pressure changes in the protected equipment and lead to dangerous situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0013] Figure 1 This is a schematic structural diagram of Example 1;

[0014] Figure 2 This is a schematic structural diagram of the inner cylinder in Example 1;

[0015] Figure 3 This is a schematic structural diagram of Example 2;

[0016] In the figure: 1. Outer tube; 2. Inner tube; 3. Second air pipe; 4. Triangular notch; 5. Round plate; 6. Fluid replenishing tube; 7. Fluid replenishing device; 701. Fluid replenishing tank; 702. First water supply pipe; 703. Float switch; 704. Second water supply pipe; 705. Manual switch; 8. First air pipe; 9. One-way valve. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Example 1

[0019] like Figures 1 to 2 As shown, according to Example 1 of the present invention, there is provided an automatic fluid replenishing positive and negative pressure protector, comprising an outer tube 1 and an inner tube 2, the outer tube 1 being fixedly connected to a first air pipe 8 for connecting to the protected equipment, the inner tube 2 being fixedly connected to a second air pipe 3 for communicating with the atmosphere, the inner tube 2 being fixedly connected to the top of the outer tube 1, the lower part of the inner tube 2 being located inside the outer tube 1, the inner tube 2 being connected to the inside of the outer tube 1 through an opening at its bottom end, and a plurality of triangular notches 4 being provided at the opening at the bottom end of the inner tube 2 covering the opening.

[0020] The inner tube 2 is funnel-shaped with a larger inner diameter at the upper part and a smaller inner diameter at the lower part, and the second air pipe 3 is arranged at the top of the inner tube 2; by setting the inner tube into a funnel shape, the accommodation space inside the inner tube is increased, and liquid is prevented from spraying out from the second air pipe at the top of the inner tube.

[0021] A circular plate 5 for preventing liquid from splashing is fixedly connected to the interior of the inner tube 2 via a bracket.

[0022] Example 2

[0023] like Figure 3 As shown, Example 2 also provides a positive and negative pressure protector for automatic fluid replenishment. The difference between Example 2 and Example 1 is that the outer tube 1 is connected to the fluid replenishment device 7 through the fluid replenishment tube 6, and the fluid replenishment tube 6 is equipped with a one-way valve 9 that only allows liquid to enter the outer tube 1 from the fluid replenishment device 7; the interface between the fluid replenishment tube 6 and the outer tube 1 is located below the bottom opening of the inner tube 2.

[0024] The rehydration device 7 includes a rehydration tank 701, to which a first water supply pipe 702 is fixedly connected. A float switch 703 is installed on the first water supply pipe 702, which is controlled to open and close according to the change of the liquid level in the rehydration tank 701; the float switch 703 is used to control the constancy of the liquid level in the rehydration tank 701.

[0025] The liquid replenishing tank 701 is fixedly connected to a second water supply pipe 704 , on which a manual switch 705 is installed; the second water supply pipe serves as a backup and is used after the first water supply pipe.

[0026] Working principle of positive and negative pressure protector

[0027] When the above-mentioned embodiment 1 and embodiment 2 are used, a certain amount of liquid is first added into the outer cylinder 1 as a liquid seal, and the liquid level of the liquid seal must exceed the opening at the bottom end of the inner cylinder 2.

[0028] When the gas level inside the protected equipment is too high, the gas enters the outer tube 1 from the protected equipment, squeezing the liquid in the outer tube 1 into the inner tube 1. When the liquid level in the outer tube 1 drops below the opening at the bottom end of the inner tube 2, the gas enters the inner tube 2 from the outer tube 1 and is discharged into the atmosphere from the second air pipe 2, thereby maintaining the stability of the gas pressure inside the protected equipment and avoiding the danger of excessive gas pressure inside the protected equipment.

[0029] When the gas level inside the protected equipment is too low, the gas enters the protected equipment from the outer tube 1, and the liquid in the inner tube 2 is sucked into the outer tube 1. When the liquid level drops below the opening at the bottom end of the inner tube 2, the outside gas enters the outer tube 1 through the inner tube 2, and then enters the protected equipment, thereby maintaining the stability of the gas pressure inside the protected equipment and avoiding the danger of low gas pressure in the protected equipment.

[0030] The principle of triangular notch

[0031] In the above-mentioned embodiments 1 and 2, by setting the triangular notch 4, when air is taken in or out, as the liquid seal level gradually decreases, the area of ​​the notch exposed to the liquid surface gradually increases, and the air intake or exhaust port also gradually increases, making the air intake or exhaust process more stable; avoiding a large amount of air intake or exhaust in an instant, which causes excessive pressure changes in the protected equipment and leads to dangerous situations.

[0032] Principle of fluid replacement device

[0033] The liquid sealed in the positive and negative pressure protector will become less and less due to natural evaporation and being carried out by gas. The liquid replenishing device 7 is used for automatic liquid replenishment to keep the amount of liquid in the positive and negative pressure protector constant.

[0034] There are two types of liquid conditions in the positive and negative pressure protectors: 1. Stable liquid level condition; 2. Fluctuating liquid level condition.

[0035] The rehydration device only rehydrates when the liquid level in the positive and negative pressure protector is stable. The rehydration process is as follows.

[0036] The liquid level in the fluid replenishment tank 701 remains constant, and the pressure on the side of the one-way valve 9 facing the fluid replenishment tank 701 remains constant. In the initial state and when the liquid level is stable, the pressure on the side of the one-way valve 9 facing the outer tube 1 is the same as the pressure on the side facing the fluid replenishment tank 701. When the liquid in the positive and negative pressure protector decreases, the pressure on the side of the one-way valve 9 facing the outer tube 1 is less than the pressure on the side of the one-way valve 9 facing the fluid replenishment tank 701. The one-way valve 9 opens, and the liquid enters the outer tube 1 for fluid replenishment.

[0037] When the liquid level in the positive and negative pressure protector fluctuates, the rehydration device does not replenish liquid, as shown below.

[0038] When the gas level inside the protected equipment is too high, the gas enters the outer tube 1 from the protected equipment, squeezing the liquid in the outer tube 1 into the inner tube 1. When the liquid level in the outer tube 1 drops below the opening at the bottom end of the inner tube 2, the pressure on the side of the one-way valve facing the outer tube 1 is equal to the pressure of the liquid in the outer tube 1 plus the pressure of the gas. The pressure on the side of the one-way valve facing the outer tube 1 is greater than that on the side facing the fluid infusion device 7, and the liquid cannot enter the outer tube from the fluid infusion device.

[0039] When the gas level inside the protected equipment is too low, the gas enters the protected equipment from the outer tube 1, and the liquid in the inner tube 2 is sucked into the outer tube 1. When the liquid level drops below the opening at the bottom end of the inner tube 2, the liquid level in the outer tube is higher, and the pressure on the side of the one-way valve facing the outer tube 1 is equal to the pressure of the liquid in the outer tube. The pressure on the side of the one-way valve facing the outer tube 1 is greater than that on the side facing the fluid replenishing device 7, and the liquid cannot enter the outer tube from the fluid replenishing device.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An automatic liquid-replenishing positive and negative pressure protector, characterized in that: The invention comprises an outer tube (1) and an inner tube (2), wherein the outer tube (1) is fixedly connected to a first air pipe (8) for connecting to the protected equipment, and the inner tube (2) is fixedly connected to a second air pipe (3) for communicating with the atmosphere, and the inner tube (2) is fixedly connected to the top of the outer tube (1), and the lower part of the inner tube (2) is located inside the outer tube (1). The inner tube (2) is connected to the inside of the outer tube (1) through an opening at its bottom end, and a plurality of triangular notches (4) are provided at the opening at the bottom end of the inner tube (2) and are distributed around the opening.

2. The automatic liquid replenishing positive and negative pressure protector according to claim 1, characterized in that: The inner cylinder (2) is funnel-shaped with a larger inner diameter at the upper portion and a smaller inner diameter at the lower portion, and the second air pipe (3) is arranged at the top of the inner cylinder (2).

3. The automatic liquid replenishing positive and negative pressure protector according to claim 1, characterized in that: A circular plate (5) for preventing liquid from splashing is fixedly connected to the interior of the inner cylinder (2) via a bracket.

4. The automatic liquid replenishing positive and negative pressure protector according to claim 1, characterized in that: The outer cylinder (1) is connected to a liquid infusion device (7) via a liquid infusion tube (6). A one-way valve (9) is installed on the liquid infusion tube (6) for allowing only liquid to enter the outer cylinder (1) from the liquid infusion device (7). The interface between the liquid infusion tube (6) and the outer cylinder (1) is located below the bottom opening of the inner cylinder (2).

5. The automatic liquid replenishing positive and negative pressure protector according to claim 4, characterized in that: The liquid replenishing device (7) comprises a liquid replenishing tank (701), a first water supply pipe (702) is fixedly connected to the liquid replenishing tank (701), and a float switch (703) is installed on the first water supply pipe (702) and is controlled to open and close according to the change of the liquid level in the liquid replenishing tank (701).

6. The automatic liquid replenishing positive and negative pressure protector according to claim 5, characterized in that: The liquid replenishing tank (701) is fixedly connected to a second water supply pipe (704), and a manual switch (705) is installed on the second water supply pipe (704).

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