Negative pressure drain valve for exhaust system and exhaust system

Abstract

The invention discloses a negative pressure drain valve for an exhaust system and the exhaust system, and relates to the technical field of drain valves, an exhaust pipe is provided with an air inlet pipe section and an air outlet pipe section, an air guide pipe is used for communicating the air inlet pipe section and the air outlet pipe section, the air guide pipe comprises a venturi pipe, a venturi hole is formed in the bottom wall of a venturi section of the venturi pipe, and the venturi hole is communicated with the venturi pipe. The shell defines a liquid accumulation space communicated with the air guide pipe so that liquid in the air guide pipe can flow into the liquid accumulation space, a liquid drainage opening is formed in the shell, the valve is located below the shell and corresponds to the liquid drainage opening, the negative pressure cavity is communicated with the Venturi hole, the cavity bottom wall of the negative pressure structure can move in the height direction of the negative pressure liquid drainage valve, and the cavity bottom wall can drive the valve to move synchronously. Therefore, the valve opens or closes the liquid outlet. Therefore, automatic liquid drainage of the exhaust system can be achieved, it is guaranteed that the liquid level in the exhaust pipe is within the installation threshold value all the time, the service life of the exhaust system is prolonged, and the liquid overflow and leakage risk and the maintenance cost of the exhaust system are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drain valves, and in particular to a negative pressure drain valve for an exhaust system and an exhaust system. Background Art

[0002] In the relevant technology, during the semiconductor manufacturing process, a large amount of complex gases containing chemicals, acidic and alkaline gases, solvent vapors and particulate matter will be generated along with process development. In order to ensure a clean process environment and meet strict environmental emission standards, the exhaust system constitutes a key equipment for gas treatment. The exhaust system is responsible for efficiently collecting the gases generated by various process equipment and transporting them to the central processing facility for purification, and ultimately achieving safe discharge. However, when the relatively high temperature gas flows through the exhaust system, it may undergo heat exchange with the exhaust pipe wall to form a large amount of condensate. At the same time, some gas processing links may also have washing liquid droplets entrained into the exhaust pipe. These droplets containing corrosive chemical components will gradually settle and accumulate at the low points of the exhaust system due to their gravity, which may cause corrosion to the exhaust pipe, shorten the life of the exhaust system, increase the risk of overflow and maintenance costs, and even worse, there is a risk of leakage, polluting the clean environment. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a negative pressure drain valve for an exhaust system, which can automatically drain the exhaust system, ensure that the liquid level in the exhaust pipe is always within the installation threshold, and thus prevent liquid from accumulating in the exhaust pipe. This greatly reduces the risk of liquid corrosion and damage to the exhaust pipe, thereby increasing the service life of the exhaust system and reducing the risk of liquid overflow and leakage and maintenance costs.

[0004] The present invention further proposes an exhaust system having the above-mentioned negative pressure drain valve for the exhaust system.

[0005] According to an embodiment of the present invention, a negative pressure drain valve for an exhaust system includes an exhaust pipe, which includes an air inlet pipe section and an air outlet pipe section. The negative pressure drain valve includes:

[0006] The air guide duct is used to connect the air inlet duct section and the air outlet duct section. The air guide duct includes a venturi tube. The bottom wall of the throat section of the venturi tube is formed with a venturi hole.

[0007] The housing is located below the air duct and is fixedly connected to the air duct. The housing defines a liquid accumulation space that communicates with the air duct so that liquid in the air duct flows into the liquid accumulation space. A drain port that communicates with the liquid accumulation space is formed at the lower end of the housing.

[0008] The valve is located below the shell and is arranged corresponding to the drain port along the height direction of the negative pressure drain valve;

[0009] The negative pressure structure is fixed in the liquid accumulation space and defines a negative pressure cavity. The negative pressure cavity is connected to the Venturi hole. The bottom wall of the cavity of the negative pressure structure is movable along the height direction of the negative pressure discharge valve. The bottom wall of the cavity is fixedly connected to the valve and can drive the valve to move synchronously to open or close the discharge port.

[0010] According to an embodiment of the present invention, a negative pressure drain valve is provided with a Venturi tube, a bottom wall of the throat section of the Venturi tube having a Venturi hole formed thereon, a housing located below and fixedly connected to the air duct, the housing defining a liquid accumulation space in communication with the air duct so that liquid in the air duct flows into the liquid accumulation space, a drain port formed at the lower end of the housing in communication with the liquid accumulation space, a valve located below the housing and arranged correspondingly to the drain port along the height direction of the negative pressure drain valve, a negative pressure structure fixedly disposed in the liquid accumulation space and defining a negative pressure cavity in communication with the Venturi hole, a cavity bottom wall of the negative pressure structure movable along the height direction of the negative pressure drain valve, and the cavity bottom wall being fixedly connected to the valve and capable of driving the valve to move synchronously to open or close the drain port. Automatic draining of the exhaust system is achieved, ensuring that the liquid level in the exhaust duct is always within the installation threshold, thereby preventing liquid from accumulating in the exhaust duct, significantly reducing the risk of liquid corrosion and damage to the exhaust duct, thereby improving the service life of the exhaust system and reducing the risk of liquid overflow and leakage and maintenance costs of the exhaust system.

[0011] According to some embodiments of the present invention, the negative pressure drain valve further includes: an elastic member, which is located in the negative pressure cavity and connected between the cavity bottom wall and the cavity top wall of the negative pressure structure, and when the valve closes the drain port, the elastic member is compressed along the height direction of the negative pressure drain valve.

[0012] According to some embodiments of the present invention, the cavity side wall of the negative pressure structure is annular, the cavity bottom wall is located below the cavity side wall, and along the height direction of the negative pressure drain valve, the orthographic projection of the cavity side wall and the orthographic projection of the cavity bottom wall have an overlapping area. When the valve closes the drain port, the lower end faces of the cavity bottom wall and the cavity side wall are in contact.

[0013] According to some embodiments of the present invention, the negative pressure liquid discharge valve further includes: a connecting pipe, the connecting pipe is connected between the top wall of the negative pressure chamber and the bottom wall of the throat section, and the connecting pipe connects the Venturi hole and the negative pressure chamber.

[0014] According to some embodiments of the present invention, the negative pressure liquid discharge valve further includes: a connecting rod structure, which is connected between the valve and the cavity bottom wall to fix the cavity bottom wall to the valve.

[0015] According to some embodiments of the present application, the air guide pipe further comprises: a first pipe body and a second pipe body, the Venturi tube is connected between the first pipe body and the second pipe body, the first pipe body is used to communicate with the air inlet pipe section, and the second pipe body is used to communicate with the air outlet pipe section; at least one of the bottom wall of the first pipe body and the bottom wall of the second pipe body is formed with a communication hole in communication with the liquid accumulation space.

[0016] According to some embodiments of the present application, the air guide pipe and the shell are integrally formed.

[0017] According to some embodiments of the present application, along the height direction of the negative pressure liquid discharge valve, the orthographic projection of the valve and the orthographic projection of the shell have an overlapping area, and the lower end surfaces of the valve and the shell are in contact when the valve closes the liquid discharge port.

[0018] According to some embodiments of the present application, a sealing ring is fixedly arranged on the surface of the valve facing the shell, and the sealing ring is in abutment with the shell and is arranged around the liquid discharge port in the circumferential direction of the liquid discharge port when the valve closes the liquid discharge port.

[0019] The exhaust system according to the embodiments of the present application comprises:

[0020] The exhaust pipe has an air inlet pipe section and an air outlet pipe section;

[0021] The negative pressure liquid discharge valve is the negative pressure liquid discharge valve of the above-mentioned embodiments, and the air guide pipe is connected between the air inlet pipe section and the air outlet pipe section to guide the air inlet pipe section and the air outlet pipe section.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a structural schematic view of the valve closed after the negative pressure liquid discharge valve of the embodiments of the present application is connected with the exhaust pipe;

[0025] Figure 2 is a structural schematic view of the valve opened after the negative pressure liquid discharge valve of the embodiments of the present application is connected with the exhaust pipe.

[0026] REFERENCE NUMERALS:

[0027] The negative pressure liquid discharge valve 100;

[0028] The air guide pipe 10; the Venturi tube 11; the throat pipe section 12; the Venturi hole 13; the communication pipe 14; the first pipe body 15; the second pipe body 16;

[0029] The shell 20; the liquid accumulation space 21; the liquid discharge port 22;

[0030] The valve 30;

[0031] The negative pressure structure 40; the negative pressure cavity 41; the cavity bottom wall 42; the cavity top wall 43; the cavity side wall 44;

[0032] The elastic member 50; the connecting rod structure 51;

[0033] The exhaust system 200; the exhaust pipe 201; the air inlet pipe section 202; the air outlet pipe section 203. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation of the present application, and should not be understood as a limitation of the present application.

[0035] The following refers to Figure 1-Figure 2 The negative pressure liquid discharge valve 100 for the exhaust system 200 and the exhaust system 200 according to the embodiments of the present application are described.

[0036] As Figure 1 and Figure 2 shown, the negative pressure liquid discharge valve 100 for the exhaust system 200 according to the embodiments of the present application, the exhaust system 200 has the exhaust pipe 201, the exhaust pipe 201 has the air inlet pipe section 202 and the air outlet pipe section 203, the negative pressure liquid discharge valve 100 comprises:

[0037] The air guide pipe 10, the air guide pipe 10 is used to guide the air inlet pipe section 202 and the air outlet pipe section 203, the air guide pipe 10 comprises the Venturi tube 11, the throat section 12 bottom wall of the throat section 12 of the Venturi tube 11 is formed with the Venturi hole 13;

[0038] The shell 20, the shell 20 is located below the air guide pipe 10 and is fixedly connected with the air guide pipe 10, the shell 20 defines the liquid accumulation space 21 communicated with the air guide pipe 10 to make the liquid in the air guide pipe 10 flow into the liquid accumulation space 21, the lower end of the shell 20 is formed with the liquid discharge port 22 communicated with the liquid accumulation space 21;

[0039] The valve 30, the valve 30 is located below the shell 20 and is arranged corresponding to the liquid discharge port 22 along the height direction of the negative pressure liquid discharge valve 100;

[0040] The negative pressure structure 40 is fixedly arranged in the liquid accumulation space 21 and defines a negative pressure cavity 41 which is communicated with the Venturi hole 13. A cavity bottom wall 42 of the negative pressure structure 40 is movable along the height direction of the negative pressure liquid discharge valve 100, and the cavity bottom wall 42 is fixedly connected with the valve 30 and can drive the valve 30 to move synchronously, so as to open or close the liquid discharge opening 22.

[0041] The exhaust system 200 can be applied to a semiconductor manufacturing process to solve the corrosion problem caused by liquid accumulation in the exhaust pipe 201. The exhaust pipe 201 has an air inlet pipe section 202 and an air outlet pipe section 203. During the semiconductor manufacturing process, a large amount of complex gas containing chemical substances, acid and alkali gas, solvent vapor and particulate matter will be generated. The gas flows from the air inlet pipe section 202 to the air outlet pipe section 203 and is efficiently collected, and is transported to a central processing facility for purification and safe discharge.

[0042] The negative pressure liquid discharge valve 100 includes a wind guide pipe 10 for guiding the air inlet pipe section 202 and the air outlet pipe section 203, so that the gas can flow from the air inlet pipe section 202 to the air outlet pipe section 203, and the exhaust system 200 can operate normally. The wind guide pipe 10 includes a Venturi tube 11. The high-speed gas flow in the exhaust pipe 201 is the energy source for driving the Venturi tube 11 to generate negative pressure. By using the high-speed gas flow in the exhaust pipe 201, the Venturi tube 11 can form a local strong negative pressure area at the position of the throat pipe section 12, and the negative pressure at the position of the Venturi hole 13 is the largest, which can reach a near vacuum state. Through the adsorption effect of the negative pressure, the Venturi hole 13 can generate adsorption force to adsorb the workpiece close to the Venturi hole 13. Specifically, when the gas flows through the Venturi tube 11 in the exhaust pipe, the flow rate increases, so that a local strong negative pressure area is formed in the Venturi tube 11. The bottom wall of the throat pipe section 12 of the Venturi tube 11 forms the Venturi hole 13. Due to the negative pressure effect, a vacuum area or a near vacuum area is formed at the Venturi hole 13, so that the Venturi hole 13 generates adsorption force to adsorb the workpiece close to the Venturi hole 13.

[0043] The shell 20 is located below the wind guide pipe 10 and is fixedly connected with the wind guide pipe 10. In some embodiments of the present application, the shell 20 and the wind guide pipe 10 can be integrally formed, or the shell 20 and the wind guide pipe 10 can be adhesively connected, but the present application is not limited thereto. The shell 20 and the wind guide pipe 10 can also be fixedly connected by other means, as long as the shell 20 is located below the wind guide pipe 10 and is fixedly connected with the wind guide pipe 10.

[0044] The shell 20 defines a liquid accumulation space 21 connected to the air duct 10 so that the liquid in the air duct 10 flows into the liquid accumulation space 21, thereby preventing the liquid from being retained in the exhaust pipe 201. This greatly reduces the risk of liquid corrosion and damage to the exhaust pipe 201, and is conducive to extending the service life of the exhaust system 200 and reducing the risk of liquid overflow and leakage and maintenance costs of the exhaust system 200. Figure 2 As shown, the lower end of the shell 20 is formed with a drain port 22 connected to the liquid accumulation space 21. The drain port 22 is used to discharge the liquid in the air duct 10 and the exhaust pipe 201, preventing the liquid from remaining in the liquid accumulation space 21 for a long time, and allowing the liquid to flow naturally to the drain port 22 under the action of gravity, reducing the resistance during the drainage process, thereby improving the drainage efficiency. The valve 30 is located below the shell 20 and is arranged corresponding to the drain port 22 along the height direction of the negative pressure drain valve 100, which helps to reduce the vibration and noise generated by the liquid during the drainage process and improve the stability and operating comfort of the system. In addition, the valve 30 and the drain port 22 are located in a centralized position, which makes it convenient for operators to monitor and manage the drainage process and promptly detect and handle abnormal situations.

[0045] The negative pressure structure 40 is fixed in the liquid accumulation space 21 and defines a negative pressure cavity 41. The negative pressure cavity 41 is connected to the venturi hole 13. The venturi hole 13 generates an adsorption force to adsorb the cavity bottom wall 42 of the negative pressure structure 40. As the magnitude of the adsorption force at the venturi hole 13 changes, the cavity bottom wall 42 of the negative pressure structure 40 can be moved along the height direction of the negative pressure drain valve 100, and the cavity bottom wall 42 is fixedly connected to the valve 30 and can drive the valve 30 to move synchronously, so that the valve 30 opens or closes the drain port 22.

[0046] Specifically, the magnitude of the adsorption force at the Venturi hole 13 is affected by the liquid in the liquid accumulation space 21. During the operation of the exhaust system 200, the gradual accumulation of liquid will cause the gas flow rate to decrease, and the Venturi effect will gradually weaken, thereby affecting the adsorption force at the Venturi hole 13. When the liquid level is higher than the Venturi tube 11, the strong negative pressure weakens or disappears. At this time, the cavity bottom wall 42 of the negative pressure structure 40, the gravity of the liquid, and the gravity of the valve 30 are greater than the adsorption force at the Venturi hole 13, so that the cavity bottom wall 42 of the negative pressure structure 40 moves downward along the height direction of the negative pressure drain valve 100, and the cavity bottom wall 42 drives the valve 30 to move downward synchronously, so that the valve 30 opens the drain port 22 for draining liquid, thereby preventing liquid from being retained in the exhaust pipe 201, greatly reducing the risk of liquid corrosion and damage to the exhaust pipe 201, and is conducive to improving the service life of the exhaust system 200, reducing the risk of liquid overflow and leakage and maintenance costs of the exhaust system 200.

[0047] When the liquid in the accumulated liquid space 21 is discharged through the drain port 22, the gas in the exhaust pipe 201 is restored to flow smoothly, the high-speed airflow gradually returns to stability, and negative pressure is generated in the venturi tube 11 again. Under the action of the negative pressure, the bottom wall 42 of the cavity moves upward along the height direction of the negative pressure drain valve 100, and the bottom wall 42 of the cavity drives the valve 30 to move upward synchronously, so that the valve 30 closes the drain port 22, and the negative pressure drain valve 100 is in a sealed state to meet the normal operation of the exhaust system 200.

[0048] Furthermore, both the housing 20 and the valve 30 can be constructed of a high-strength, corrosion-resistant alloy. The air duct 10 is provided with an air inlet and an air outlet with standard flange interfaces at both ends. The air duct 10 is sealed to the exhaust duct 201 via a bolt assembly, ensuring the sealing of the internal flow channel and the liquid accumulation space 21. Specifically, as a specific embodiment of the present invention, the housing 20 can be cast from 316L stainless steel, which is corrosion-resistant and high-temperature resistant. The diameter of the throat section 12 of the venturi tube 11 can be reduced to 30%-50% of the inlet section 202. The venturi orifice 13 can be located below the smallest throat section 12. The diameter of the venturi orifice 13 can be 6mm-8mm. The negative pressure chamber 41 is located below the venturi orifice 13. The volume of the negative pressure chamber 41 can be 0.1L-0.3L. The diameter of the valve 30 can be 59mm-61mm. However, the above dimensional parameters can be reasonably designed based on actual conditions and are not limited to the above ranges.

[0049] Therefore, through the negative pressure drain valve 100 of the present invention, the valve 30 can be automatically opened and closed under the negative pressure of the venturi tube 11. The dynamic balance mechanism of the local negative pressure generated when the gas flows through the venturi tube 11 and the gravity of the liquid is used to construct a zero-energy self-driven drain system. By utilizing the Venturi effect, when the accumulated liquid reaches the critical liquid level, the liquid's own weight breaks the negative pressure adsorption seal and opens the valve 30, prompting the accumulated liquid to be automatically discharged through the drain port 22. When the liquid level drops back to the safe range, the negative pressure in the venturi tube 11 re-adsorbs the cavity bottom wall 42 and closes the valve synchronously. 30. This system forms a fully mechanical closed-loop control system of "liquid level triggering - automatic drainage - negative pressure reset," relying entirely on the system's own fluid dynamics and mechanical structure. It lacks electric components or an electronic control system drive, enabling automatic drainage of the exhaust system 200 and ensuring that the liquid level in the exhaust pipe 201 is always within the installation threshold. This prevents liquid from accumulating in the exhaust pipe 201, significantly reducing the risk of liquid corrosion and damage to the exhaust pipe 201. This helps extend the service life of the exhaust system 200 and reduces the risk of liquid overflow and leakage, as well as maintenance costs. Furthermore, the negative pressure drain valve 100 has a simple structure and can be directly embedded in the existing exhaust pipe 201 for retrofitting, eliminating the need for large-scale adjustments to the exhaust system 200. This significantly enhances the negative pressure drain valve's engineering adaptability.

[0050] According to the negative pressure drain valve 100 of the embodiment of the present invention, a venturi tube 11 is provided, a venturi hole 13 is formed on the bottom wall of the throat section 12 of the venturi tube 11, a shell 20 is located below the air duct 10 and is fixedly connected to the air duct 10, the shell 20 defines a liquid accumulation space 21 communicating with the air duct 10 so that the liquid in the air duct 10 flows into the liquid accumulation space 21, and a drain port 22 communicating with the liquid accumulation space 21 is formed at the lower end of the shell 20. The door 30 is located below the housing 20 and is arranged corresponding to the drain port 22 along the height direction of the negative pressure drain valve 100. The negative pressure structure 40 is fixedly installed in the liquid accumulation space 21 and defines a negative pressure chamber 41. The negative pressure chamber 41 is connected to the venturi hole 13. The bottom wall 42 of the negative pressure structure 40 is movable along the height direction of the negative pressure drain valve 100. The bottom wall 42 is fixedly connected to the valve 30 and can drive the valve 30 to move synchronously to open or close the drain port 22. This can achieve automatic drainage of the exhaust system 200, ensure that the liquid level in the exhaust pipe 201 is always within the installation threshold, and thus prevent liquid from being retained in the exhaust pipe 201, greatly reducing the risk of liquid corrosion and damage to the exhaust pipe 201, which is conducive to improving the service life of the exhaust system 200 and reducing the risk of liquid overflow and leakage and maintenance costs of the exhaust system 200.

[0051] According to some embodiments of the present invention, Figure 1 As shown, the negative pressure drain valve 100 may further include: an elastic member 50, which is located in the negative pressure cavity 41 and connected between the cavity bottom wall 42 and the cavity top wall 43 of the negative pressure structure 40, and when the valve 30 closes the drain port 22, the elastic member 50 is compressed along the height direction of the negative pressure drain valve 100.

[0052] Among them, the elastic member 50 can be constructed as a spring, and the elastic member 50 is located in the negative pressure chamber 41 and is connected between the chamber bottom wall 42 and the chamber top wall 43 of the negative pressure structure 40. In some embodiments of the present invention, the elastic member 50 and the chamber bottom wall 42 and the chamber top wall 43 can be connected by bonding, or the elastic member 50 and the chamber bottom wall 42 and the chamber top wall 43 can be connected by welding, but the present invention is not limited to this. The elastic member 50 and the chamber bottom wall 42 and the chamber top wall 43 can also be connected by other means, as long as the elastic member 50 is located in the negative pressure chamber 41 and is connected between the chamber bottom wall 42 and the chamber top wall 43 of the negative pressure structure 40.

[0053] When the valve 30 closes the drain port 22, the elastic member 50 is compressed along the height direction of the negative pressure drain valve 100. Specifically, the gas in the discharge pipe accelerates as it flows through the venturi tube 11, creating a localized strong negative pressure region within the venturi tube 11. The bottom wall of the throat section 12 of the venturi tube 11 is formed with a venturi hole 13. Due to the negative pressure, a vacuum region or a near-vacuum region is formed at the venturi hole 13, generating an adsorption force at the venturi hole 13 to adsorb the elastic member 50, causing the elastic member 50 to be compressed along the height direction of the negative pressure drain valve 100. The elastic member 50 also pulls the cavity bottom wall 42 upward, causing the valve 30 connected to the cavity bottom wall 42 to move upward and contact the housing 20, thereby closing the drain port 22 to form a sealed environment and ensure that there is no gas leakage during the normal operation of the exhaust system 200.

[0054] According to some embodiments of the present invention, the cavity side wall 44 of the negative pressure structure 40 is annular, the cavity bottom wall 42 is located below the cavity side wall 44, and along the height direction of the negative pressure drain valve 100, the positive projection of the cavity side wall 44 and the positive projection of the cavity bottom wall 42 have an overlapping area. When the valve 30 closes the drain port 22, the lower end faces of the cavity bottom wall 42 and the cavity side wall 44 are in contact.

[0055] Among them, the cavity side wall 44 of the negative pressure structure 40 can be annular, and the cavity bottom wall 42 is located below the cavity side wall 44, and along the height direction of the negative pressure drain valve 100, the positive projection of the cavity side wall 44 and the positive projection of the cavity bottom wall 42 have an overlapping area, so that the contact between the cavity bottom wall 42 and the lower end surface of the cavity side wall 44 can form a tight physical sealing interface, effectively preventing gas leakage. When the valve 30 closes the drain port 22, the cavity bottom wall 42 and the lower end surface of the cavity side wall 44 are in contact, which can ensure that the negative pressure cavity 41 can reliably isolate the accumulated liquid space 21 under a negative pressure environment and maintain a negative pressure environment. Since the valve 30 is connected to the cavity bottom wall 42, the cavity bottom wall 42 and the lower end surface of the cavity side wall 44 are in contact, and the cavity bottom wall 42 has a specific pulling effect on the valve 30, thereby enabling the valve 30 to keep the drain port 22 closed to ensure that there is no gas leakage during the normal operation of the exhaust system 200.

[0056] According to some embodiments of the present invention, the negative pressure liquid discharge valve 100 further includes: a connecting pipe 14, which is connected between the top wall 43 of the negative pressure chamber 41 and the bottom wall of the throat section 12, and the connecting pipe 14 connects the Venturi hole 13 and the negative pressure chamber 41.

[0057] When the gas flows through the throat section 12 of the Venturi tube 11, the flow rate of the gas increases due to the decrease in the cross-sectional area of the throat section 12, and a local low-pressure area (Venturi effect) is formed according to Bernoulli's principle. The communication pipe 14 is connected between the cavity top wall 43 of the negative pressure cavity 41 and the bottom wall of the throat section 12, and the communication pipe 14 communicates the Venturi hole 13 and the negative pressure cavity 41. The communication pipe 14 transmits the low pressure to the negative pressure cavity 41, realizes the continuous supply and dynamic balance of the negative pressure, and forms a closed-loop feedback. As shown in FIG. 8, when the gas continuously flows through the Venturi tube 11, the communication pipe 14 generates an adsorption force at the port of the negative pressure cavity 41 to adsorb the cavity bottom wall 42 of the negative pressure structure 40, thereby synchronously closing the valve 30, so as to ensure that there is no gas leakage when the exhaust system 200 normally operates. Figure 1

[0058] The size of the adsorption force of the communication pipe 14 at the port of the negative pressure cavity 41 is affected by the liquid in the liquid accumulation space 21. During the operation of the exhaust system 200, the gradual accumulation of the liquid will cause the flow rate of the gas to decrease, thereby affecting the adsorption force at the Venturi hole 13. Under the change of the adsorption force, the cavity bottom wall 42 of the negative pressure structure 40 can be moved along the height direction of the negative pressure liquid discharge valve 100, and the cavity bottom wall 42 is fixedly connected with the valve 30 and can drive the valve 30 to move synchronously, so as to open or close the liquid discharge port 22 of the valve 30. Thus, the automatic opening and closing of the valve 30 under the negative pressure of the Venturi tube 11 can be realized, and a zero-energy-consumption self-driven liquid discharge system is constructed through the dynamic balance mechanism of the local negative pressure generated when the gas flows through the Venturi tube 11 and the gravity of the liquid.

[0059] According to some embodiments of the present application, the negative pressure liquid discharge valve 100 further comprises a connecting rod structure 51 connected between the valve 30 and the cavity bottom wall 42, so that the cavity bottom wall 42 is fixedly connected with the valve 30.

[0060] The connecting rod structure 51 is connected between the valve 30 and the cavity bottom wall 42. In some embodiments of the present application, the connecting rod structure 51 can be fixedly connected with the valve 30 and the cavity bottom wall 42 by adhesion, or the connecting rod structure 51 can be fixedly connected with the valve 30 and the cavity bottom wall 42 by welding, but the present application is not limited thereto. The connecting rod structure 51 can also be connected with the valve 30 and the cavity bottom wall 42 by other means, as long as the connecting rod structure 51 is connected between the valve 30 and the cavity bottom wall 42 to fixedly connect the cavity bottom wall 42 with the valve 30.

[0061] By connecting the connecting rod structure 51 between the valve 30 and the cavity bottom wall 42, the opening and closing of the valve 30 and the movement of the cavity bottom wall 42 can be strictly synchronized, thereby realizing the automatic opening and closing of the valve 30 under the negative pressure of the Venturi tube 11, and constructing a zero-energy-consumption self-driven liquid discharge system through the dynamic balance mechanism of the local negative pressure generated when the gas flows through the Venturi tube 11 and the gravity of the liquid.​

[0062] According to some embodiments of the present invention, the air duct 10 further includes: a first tube body 15 and a second tube body 16, the venturi tube 11 is connected between the first tube body 15 and the second tube body 16, the first tube body 15 is used to communicate with the air inlet pipe section 202, and the second tube body 16 is used to communicate with the air outlet pipe section 203, and at least one of the bottom walls of the first tube body 15 and the second tube body 16 is formed with a connecting hole connected to the liquid accumulation space 21.

[0063] Among them, the venturi tube 11 is connected between the first tube body 15 and the second tube body 16, the first tube body 15 is used to communicate with the air inlet pipe section 202, and the second tube body 16 is used to communicate with the air outlet pipe section 203, so that the gas enters the venturi tube 11 through the first tube body 15 and flows out of the venturi tube 11 from the second tube body 16. Due to the Venturi effect, an adsorption force is generated at the venturi hole 13 of the venturi tube 11 to adsorb the elastic part 50, so that the elastic part 50 can pull the cavity bottom wall 42 to close the valve 30 when the exhaust system 200 is operating normally, to ensure that there is no gas leakage when the exhaust system 200 is operating normally.

[0064] At least one of the bottom wall of the first tube body 15 and the bottom wall of the second tube body 16 is formed with a connecting hole connected to the liquid accumulation space 21. In some embodiments of the present invention, the bottom wall of the first tube body 15 is formed with a connecting hole connected to the liquid accumulation space 21, or the bottom wall of the second tube body 16 is formed with a connecting hole connected to the liquid accumulation space 21, or the bottom wall of the first tube body 15 and the bottom wall of the second tube body 16 are both formed with connecting holes connected to the liquid accumulation space 21 (the present invention is explained using this embodiment as an example). The accumulated liquid in the exhaust pipe 201 can flow into the liquid accumulation space 21 through the connecting hole. When the liquid level in the liquid accumulation space 21 is higher than the venturi tube 11, the strong negative pressure weakens or disappears. At this time, Figure 2 As shown, the gravity of the cavity bottom wall 42 of the negative pressure structure 40, the gravity of the elastic member 50, the gravity of the liquid, and the gravity of the valve 30 are greater than the adsorption force at the venturi hole 13, so that the cavity bottom wall 42 of the negative pressure structure 40 moves downward along the height direction of the negative pressure drain valve 100, and the cavity bottom wall 42 drives the valve 30 to move downward synchronously, so that the valve 30 opens the drain port 22 for draining, thereby avoiding liquid from remaining in the exhaust pipe 201, greatly reducing the risk of liquid corrosion and damage to the exhaust pipe 201, which is beneficial to improving the service life of the exhaust system 200 and reducing the risk of liquid overflow and leakage and maintenance cost of the exhaust system 200.

[0065] According to some embodiments of the present invention, the air duct 10 and the shell 20 can be integrally formed. The integral forming process is simple, which is conducive to improving the production efficiency of the air duct 10 and the shell 20, reducing manufacturing costs, and avoiding weak connection points between the air duct 10 and the shell 20, thereby enhancing the structural strength of the air duct 10 and the shell 20.

[0066] According to some embodiments of the present invention, along the height direction of the negative pressure drain valve 100, the orthographic projection of the valve 30 and the orthographic projection of the shell 20 have an overlapping area. When the valve 30 closes the drain port 22, the lower end surfaces of the valve 30 and the shell 20 are in contact.

[0067] Among them, the orthographic projection of the valve 30 and the orthographic projection of the shell 20 have an overlapping area, so that a tight physical sealing interface can be formed when the valve 30 contacts the shell 20. When the valve 30 closes the drain port 22, the valve 30 and the lower end surface of the shell 20 contact, which can effectively prevent gas leakage, thereby ensuring that there is no gas leakage when the exhaust system 200 operates normally.

[0068] According to some embodiments of the present invention, a sealing ring is fixedly provided on the surface of the valve 30 facing the housing 20 . When the valve 30 closes the drain port 22 , the sealing ring abuts against the housing 20 and is arranged around the drain port 22 along the circumference of the drain port 22 .

[0069] A sealing ring is fixedly mounted on the surface of the valve 30 facing the housing 20. In some embodiments of the present invention, the valve 30 and the sealing ring may be bonded or integrally formed, but the present invention is not limited thereto. The valve 30 and the sealing ring may also be fixedly mounted in other ways, as long as a sealing ring is fixedly mounted on the surface of the valve 30 facing the housing 20. When the valve 30 closes the drain port 22, the sealing ring abuts the housing 20 and is disposed around the drain port 22 along its circumference, thereby sealing the drain port 22 and ensuring no gas leakage during normal operation of the exhaust system 200.

[0070] The exhaust system 200 according to an embodiment of the present invention includes:

[0071] The exhaust pipe 201 has an air inlet pipe section 202 and an air outlet pipe section 203;

[0072] The negative pressure liquid discharge valve 100 is the negative pressure drainage valve of the above-mentioned embodiment. The air guide pipe 10 is connected between the air inlet pipe section 202 and the air outlet pipe section 203 to guide the air inlet pipe section 202 and the air outlet pipe section 203. Through the negative pressure effect of the Venturi tube 11, the cavity bottom wall 42 of the negative pressure structure 40 is movable along the height direction of the negative pressure liquid discharge valve 100. The cavity bottom wall 42 is fixedly connected with the valve 30 and can drive the valve 30 to move synchronously, so as to open or close the liquid discharge port 22. The automatic liquid discharge of the exhaust system 200 can be realized, and the liquid level in the exhaust pipe 201 can be ensured to be always within the installation threshold. In turn, the liquid can be avoided to stay in the exhaust pipe 201, the risk of liquid corrosion and damage to the exhaust pipe 201 is greatly reduced, the service life of the exhaust system 200 is improved, and the liquid overflow and leakage risk and maintenance cost of the exhaust system 200 are reduced.

[0073] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A negative pressure drain valve for an exhaust system, characterized in that: The exhaust system comprises an exhaust pipe, the exhaust pipe comprises an air inlet pipe section and an air outlet pipe section, and the negative pressure drain valve comprises: An air guide duct, the air guide duct being used to connect the air inlet duct section and the air outlet duct section, the air guide duct comprising a venturi tube, a venturi hole being formed on a bottom wall of a throat section of the venturi tube; a housing, the housing being located below the air duct and fixedly connected to the air duct, the housing defining a liquid accumulation space in communication with the air duct so that liquid in the air duct flows into the liquid accumulation space, and a drain port in communication with the liquid accumulation space being formed at a lower end of the housing; a valve, the valve being located below the housing and being arranged corresponding to the drain port along a height direction of the negative pressure drain valve; A negative pressure structure is fixed in the liquid accumulation space and defines a negative pressure cavity, the negative pressure cavity is connected to the Venturi hole, the cavity bottom wall of the negative pressure structure is movable along the height direction of the negative pressure drain valve, and the cavity bottom wall is fixedly connected to the valve and can drive the valve to move synchronously so that the valve opens or closes the drain port.

2. The negative pressure drain valve for an exhaust system according to claim 1, characterized in that: The negative pressure drain valve also includes: an elastic member, which is located in the negative pressure cavity and connected between the cavity bottom wall and the cavity top wall of the negative pressure structure, and when the valve closes the drain port, the elastic member is compressed along the height direction of the negative pressure drain valve.

3. The negative pressure drain valve for an exhaust system according to claim 2, characterized in that: The cavity side wall of the negative pressure structure is annular, the cavity bottom wall is located below the cavity side wall, and along the height direction of the negative pressure drain valve, the orthographic projection of the cavity side wall and the orthographic projection of the cavity bottom wall have an overlapping area. When the valve closes the drain port, the lower end faces of the cavity bottom wall and the cavity side wall are in contact.

4. The negative pressure drain valve for an exhaust system according to any one of claims 1 to 3, characterized in that: The negative pressure liquid discharge valve further includes a connecting pipe connected between the top wall of the negative pressure chamber and the bottom wall of the throat section, and the connecting pipe connects the Venturi hole and the negative pressure chamber.

5. The negative pressure drain valve for an exhaust system according to any one of claims 1 to 3, characterized in that: The negative pressure liquid discharge valve further includes a connecting rod structure, which is connected between the valve and the cavity bottom wall to ensure that the cavity bottom wall is fixedly connected to the valve.

6. The negative pressure drain valve for an exhaust system according to any one of claims 1 to 3, characterized in that: The air duct also includes: a first tube body and a second tube body, the Venturi tube is connected between the first tube body and the second tube body, the first tube body is used to communicate with the air inlet pipe section, and the second tube body is used to communicate with the air outlet pipe section, and at least one of the bottom walls of the first tube body and the second tube body is formed with a connecting hole connected to the liquid accumulation space.

7. The negative pressure drain valve for an exhaust system according to any one of claims 1 to 3, characterized in that: The air guide duct and the shell are integrally formed.

8. The negative pressure drain valve for an exhaust system according to any one of claims 1 to 3, characterized in that: Along the height direction of the negative pressure liquid discharge valve, the orthographic projection of the valve and the orthographic projection of the shell have an overlapping area. When the valve closes the liquid discharge port, the valve is in contact with the lower end surface of the shell.

9. The negative pressure drain valve for an exhaust system according to claim 8, characterized in that: A sealing ring is fixedly provided on the surface of the valve facing the housing. When the valve closes the drain port, the sealing ring abuts against the housing and is arranged around the drain port along the circumference of the drain port.

10. An exhaust system, characterized in that: include: An exhaust pipe, the exhaust pipe having an air inlet pipe section and an air outlet pipe section; A negative pressure drain valve, wherein the negative pressure drain valve is a negative pressure drain valve according to any one of claims 1 to 9, and the air duct is connected between the air inlet duct section and the air outlet duct section to conduct the air inlet duct section and the air outlet duct section.

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