Positive and negative pressure protector

Abstract

The invention 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, a first air pipe used for being connected with protected equipment is fixedly connected to the outer cylinder, a second air pipe used for being communicated with the atmosphere is fixedly connected to the inner cylinder, 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 invention, the triangular notch is arranged, so that the area, exposed out of the liquid level, of the notch 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 invention relates to the technical field of positive and negative pressure protectors, in particular to a positive and negative pressure protector. Background Art

[0002] The patent with 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 assembly; 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 internal pressure of the protected device is positive, or to inhale gas into the protected device when the internal pressure is negative. The exhaust cylinder is arranged at the top of the positive and negative pressure protector and is connected to the protector cylinder, and is used 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. Summary of the invention

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

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

[0006] Furthermore, the inner cylinder 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 cylinder; by arranging the inner cylinder into a funnel shape, the accommodation space inside the inner cylinder is increased, and liquid is prevented from spraying out of the second air pipe at the top of the inner cylinder.

[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 a liquid replenishing device via a liquid replenishing tube, a one-way valve is installed on the liquid replenishing tube to only allow liquid to enter the outer cylinder from the liquid replenishing device, and the interface between the liquid replenishing tube and the outer cylinder is located below the bottom opening of the inner cylinder.

[0009] Furthermore, the liquid replenishing device includes a liquid replenishing 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 be opened and closed by changes in the liquid level in the liquid replenishing 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 present invention 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, so that the air intake or exhaust process is more stable, and a large amount of air is inhaled or exhausted 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 improper limitations on the present invention.

[0013] Figure 1 It is a structural schematic diagram of Example 1; Figure 2 It is a structural schematic diagram of the inner cylinder in Example 1; Figure 3 It is a structural schematic diagram of Example 2; In the figure: 1. outer cylinder; 2. inner cylinder; 3. second air pipe; 4. triangular notch; 5. round plate; 6. liquid replenishing pipe; 7. liquid replenishing device; 701. liquid 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

[0014] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0015] Example 1 like Figure 1 to Figure 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 cylinder 1 and an inner cylinder 2, the outer cylinder 1 being fixedly connected with a first air pipe 8 for connecting to a protected device, the inner cylinder 2 being fixedly connected with a second air pipe 3 for communicating with the atmosphere, the inner cylinder 2 being fixedly connected to the top of the outer cylinder 1, the lower part of the inner cylinder 2 being located inside the outer cylinder 1, the inner cylinder 2 being connected with the inside of the outer cylinder 1 through an opening at its bottom end, and a plurality of triangular notches 4 distributed around the opening are provided at the opening at the bottom end of the inner cylinder 2.

[0016] The inner cylinder 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 cylinder 2; by setting the inner cylinder into a funnel shape, the accommodation space inside the inner cylinder is increased, and liquid is prevented from spraying out of the second air pipe at the top of the inner cylinder.

[0017] A circular plate 5 for preventing liquid from splashing is fixedly connected to the interior of the inner tube 2 via a bracket.

[0018] Example 2 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 cylinder 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 cylinder 1 from the fluid replenishment device 7; the interface between the fluid replenishment tube 6 and the outer cylinder 1 is located below the bottom opening of the inner cylinder 2.

[0019] The replenishing device 7 includes a replenishing tank 701, to which a first water supply pipe 702 is fixedly connected, and 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 replenishing tank 701; the float switch 703 is used to control the constancy of the liquid level in the replenishing tank 701.

[0020] The liquid replenishing tank 701 is fixedly connected with a second water supply pipe 704, on which a manual switch 705 is installed; the second water supply pipe is used as a backup and is used after the first water supply pipe.

[0021] Working principle of positive and negative pressure protector When the above-mentioned Embodiment 1 and Embodiment 2 are used, firstly, a certain amount of liquid is added into the outer cylinder 1 as a liquid seal, and the liquid level height of the liquid seal must exceed the opening at the bottom end of the inner cylinder 2.

[0022] When the gas inside the protected equipment is too high, the gas enters the outer cylinder 1 from the protected equipment, squeezing the liquid in the outer cylinder 1 into the inner cylinder 1; when the liquid level in the outer cylinder 1 drops below the opening at the bottom end of the inner cylinder 2, the gas enters the inner cylinder 2 from the outer cylinder 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.

[0023] When the gas inside the protected equipment is too low, the gas enters the protected equipment from the outer cylinder 1, and the liquid in the inner cylinder 2 is sucked into the outer cylinder 1. When the liquid level drops below the opening at the bottom of the inner cylinder 2, the outside gas enters the outer cylinder 1 through the inner cylinder 2, and then enters the protected equipment, thereby maintaining the stability of the gas pressure inside the protected equipment and avoiding the danger of too low gas pressure in the protected equipment.

[0024] The principle of the triangular notch In the above-mentioned Embodiment 1 and Embodiment 2, by setting the triangular notch 4, when air is taken in or exhausted, as the liquid seal liquid 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 may cause excessive pressure changes in the protected equipment and lead to dangerous situations.

[0025] Principle of fluid replacement device 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.

[0026] There are two types of liquid conditions in the positive and negative pressure protectors: 1. Stable liquid level condition; 2. Fluctuating liquid level condition.

[0027] The fluid replenishing device only replenishes fluid when the liquid level in the positive and negative pressure protector is stable. The fluid replenishing process is as follows.

[0028] 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, and the one-way valve 9 opens, and the liquid enters the outer tube 1 for fluid replenishment.

[0029] When the liquid level in the positive and negative pressure protector fluctuates, the liquid replenishing device does not replenish liquid, and the situation is as follows.

[0030] When the gas level inside the protected equipment is too high, the gas enters the outer cylinder 1 from the protected equipment, squeezing the liquid in the outer cylinder 1 into the inner cylinder 1. When the liquid level in the outer cylinder 1 drops below the opening at the bottom end of the inner cylinder 2, the pressure on the side of the one-way valve facing the outer cylinder 1 is equal to the pressure of the liquid in the outer cylinder 1 plus the pressure of the gas. The pressure on the side of the one-way valve facing the outer cylinder 1 is greater than that on the side facing the liquid replenishing device 7, and the liquid cannot enter the outer cylinder from the liquid replenishing device.

[0031] When the gas level inside the protected equipment is too low, the gas enters the protected equipment from the outer cylinder 1, and the liquid in the inner cylinder 2 is sucked into the outer cylinder 1. When the liquid level drops below the opening at the bottom end of the inner cylinder 2, the liquid level in the outer cylinder is higher, and the pressure on the side of the one-way valve toward the outer cylinder 1 is equal to the pressure of the liquid in the outer cylinder. The pressure on the side of the one-way valve toward the outer cylinder 1 is greater than that on the side toward the fluid replenishing device 7, and the liquid cannot enter the outer cylinder from the fluid replenishing device.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

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

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 only allowing 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), to which a first water supply pipe (702) is fixedly connected, and a float switch (703) is installed on the first water supply pipe (702) and is controlled to be opened and closed by changes in 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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