A vacuum drain valve

Abstract

The present invention relates to a vacuum sewage valve, comprising a valve body, a main valve core assembly arranged inside the valve body to realize the opening and closing of the valve body, and an inner valve core assembly arranged inside the main valve core assembly to realize the disconnection and sealing inside the valve body; the valve body has a connecting flow channel inside, and the inside of the valve body is used to intermittently introduce air or form a vacuum; the main valve core assembly is arranged in the valve body, and realizes telescopic movement toward one side of the connecting flow channel through the ventilation state inside the valve body; the inner valve core assembly is arranged on the side of the main valve core assembly biased towards the connecting flow channel, and is used to realize the sealing between the end of the main valve core assembly and the inner wall of the connecting flow channel; the present invention adopts pressure difference driving technology for control, and the streamlined design of the connecting flow channel minimizes the flow resistance, maximizes the flow efficiency, and optimizes the vacuum sewage transportation efficiency, and adopts air replenishment and noise reduction technology to perform active noise reduction, and adopts inching active odor extraction technology to achieve stronger functionality of the overall structure.

Description

Technical Field

[0001] The present invention relates to the field of vacuum sewage collection, transportation and treatment technology, wherein vacuum sewage collection technology refers to a front-end device or product for collecting sewage at the sewage source, including but not limited to various kitchens (such as toilets, urinals, shower rooms, bathtubs, etc.) and sanitary products (such as vegetable sinks, dishwashers, etc.); vacuum sewage transportation technology refers to the relevant technology of efficiently transporting sewage collected by the front-end device or product to sewage post-treatment equipment, including core components such as vacuum pump stations, sewage collection tanks, underground (main layout form) vacuum transportation pipe network systems, vacuum wells, fault detection and diagnosis systems, etc.; vacuum sewage treatment technology refers to post-treatment equipment or devices, the main function of which is to separate and purify the centralized collected sewage into solids and liquids, wherein the solid can be made into organic fertilizer, and the sewage can be filtered and purified by MBR membrane technology to achieve green discharge. The present invention particularly relates to a vacuum sewage valve used in a vacuum toilet. Background Art

[0002] In the field of vacuum domestic sewage collection, transportation and treatment technology, vacuum domestic sewage collection is the most advanced technology, and its basic implementation principle is as follows:

[0003] (1) First, the sewage collection inlet pipeline (or sewage discharge inlet pipeline) in the vacuum sewage transportation system is connected to various sewage front-end collection equipment, including but not limited to various kitchens (such as toilets, urinals, shower rooms, bathtubs, etc.) and sanitary products (such as vegetable sinks, dishwashers, etc.);

[0004] (2) Secondly, the vacuum pump group generates vacuum in the vacuum sewage transportation system;

[0005] (3) Finally, during the operation of the sewage front-end collection equipment, after the vacuum sewage valve is turned on, the pressure difference between the external atmospheric pressure and the vacuum value inside the pipeline in the vacuum sewage transportation system acts on the sewage and mixes with air to achieve turbulent sewage transportation to the sewage collection inlet pipeline (or sewage discharge inlet pipeline).

[0006] It is well known that the disadvantage of the vacuum sewage system is its higher failure rate compared to the gravity sewage system, and vacuum toilet failures account for a large proportion of the entire vacuum sewage system. Among vacuum toilet failures, the vacuum sewage valve is the most susceptible to damage.

[0007] In recent years, with the development of science and technology, the following types of vacuum drain valves are known:

[0008] First, the clamp valve: the reference core patents are FR2366186B1 (1976), US3984080 (1976), US6575425 (2003), CN101225673A (2007), US7832431 (2010), CN101046105B (2011), US8585006 (2013), CN1034382 37A (2013), CN105089131A (2014), CN108006260A (2017), CN109083236A (2018), CN109027302A (2018), CN108457345A (2018), CN109138114A (2019), CN109973697A (2019);

[0009] With respect to the known technologies, these pipe clamp valves do not have a noise reduction function. With respect to the known vacuum drain valves, the vacuum toilet will generate a large flushing noise during the flushing process; the vacuum toilet will generate two large noises during use, namely, when the vacuum drain valve is opened, the vacuum toilet will generate a large peak noise, and when the vacuum drain valve is closed, the vacuum toilet will generate another large peak noise; the fundamental reason for the generation of these peak noises is the real-time throttling effect of the internal opening and closing port of the vacuum drain valve, especially when it is about to be opened (the vacuum drain valve is gradually opened) and when it is about to be closed (the vacuum drain valve is gradually closed); the known technologies The technical solution (refer to US6128789A, EP0778432B1) adopts an airtight toilet seat or a toilet seat with good noise absorption, and also adopts a vacuum drain valve with active ventilation function. At the same time, the inventor has effectively utilized the known technical experience, that is, the noise limit value can be significantly reduced by reducing the on-off time of the vacuum drain valve; the specific feature of this technical solution is that the opening time of the vacuum drain valve is controlled below 0.25 seconds, and the closing time of the vacuum drain valve is controlled below 0.40 seconds. Although the solution is relatively simple and low-cost, the noise reduction technology and method are more effective in reducing noise, reducing it by about 15 decibels.

[0010] Therefore, in the process of designing a tube clamp valve type vacuum drain valve, in order to ensure the functional requirement of low noise, it is necessary to increase the opening and closing speed of the tube clamp valve, and at the same time, it is necessary to increase the ventilation pipeline. Since the valve core of the tube clamp valve is made of corrugated diaphragm rubber material, the rubber material has natural elasticity, so the room for increasing the opening and closing speed is limited; and, although the technical solution of opening a ventilation pipeline on the corrugated diaphragm is a direction worthy of structural improvement, it also increases the complexity of the structure and reduces the reliability of the tube clamp valve type vacuum drain valve.

[0011] It should be emphasized that, for the known technology, the flow area made of corrugated diaphragm is susceptible to wear and tear, which reduces the service life. The flow area made of flexible materials requires that the upper and lower areas are tightly combined together in the closed state, but the pressure cannot be too high, so as to achieve the reliability of closing with the minimum pressure, while improving the service life of the pipe clamp valve and reducing maintenance performance.

[0012] Second, cartridge valve: the reference core patents are US2420849 (1943), US5082238 (1990), US5078174 (1990), US5575454 (1994), EP0778432B1 (1995), CN1201057C (1998);

[0013] The first problem with the known technology is that impurities in the sewage will adhere to the matching surface between the plunger head and the shell, causing the vacuum drain valve to leak air and water. It is well known that when designing a vacuum drain valve, the functional characteristics required to have the following characteristics: simple structure, low manufacturing cost, easy maintenance, fast switching action, waterproof, long life, and low noise. For the known vacuum drain valve, the sewage in the vacuum toilet contains impurities such as waste paper and excrement. Therefore, in the process of designing the vacuum drain valve, it is extremely important to ensure that impurities will not accumulate in the valve body, because this will not affect the use of the valve function. Although it is known The technology adopts an inverted cone plunger end to improve the sealing performance of the mating surface between it and the shell. However, due to the nonlinear structural design and the intermittent use frequency of the vacuum sewage valve, when the vacuum sewage valve is not working, the area at the bottom of the vacuum sewage valve piston chamber where the telescopic inverted cone plunger end is stored is prone to retain the impure sewage that comes from the impact. As time goes by, the impurities hanging on the wall will flow into the vicinity of the sealing ring and consolidate and corrode into one. Then, in the long-term on-off process, the matching accuracy of the tapered plunger head mating surface will be corroded, resulting in inconsistent corrosion, or poor sealing and leakage due to aging and hardening of the sealing ring.

[0014] The second problem with the known technologies is that the vacuum sewage valve consumes a lot of energy and has a low conveying efficiency during the sewage discharge process; the flow channel used in these technologies is nonlinear, in other words, the end faces of the valve body and the tapered plunger head are not parallel to the horizontal plane but have an inclination angle, so that the route of the sewage is not a horizontal streamline, but a streamline that needs to change direction once or even several times, resulting in a reduction in the effective flow cross-sectional area of ​​the vacuum sewage valve; in the process of changing direction, the sewage will produce impact, which will not only generate noise but also vibration, which will affect the sealing performance of related products. What is more serious is that the sewage greatly reduces the flow rate of the sewage during the impact reversal process, thereby reducing the efficiency and effectiveness of the subsequent vacuum sewage transportation system.

[0015] The third problem with the known technology is: it is inconvenient to install and occupies a large space; the known technology of the vacuum drain valve is an inclined valve seat and valve chamber, and one of the purposes of this arrangement is to collect the condensed water condensed in the upper and lower chambers of the corrugated diaphragm assembly in real time and discharge it smoothly; the corrugated diaphragm assembly in the vacuum drain valve is inclined relative to the center line of the vacuum drain valve input and output pipelines, resulting in inconvenient manual disassembly and assembly of the vacuum drain valve, the head occupies a large space, and more seriously, it will block the disassembly and assembly of the pressure sensor detection device, and the discharge port of the condensed water in the lower chamber of the vacuum drain valve is at the lowest point of the valve core shell, which is not convenient for disassembly and assembly of fixing pipes and connecting pipes.

[0016] Third, ball valve type: the reference core patent is KR1020160113852A;

[0017] For example, there is an electromagnetically driven rotary ball valve, or a rotary ball valve driven by air pressure difference. The main problems with this ball valve are the sealing performance and resistance between the spherical valve core with a through hole and the inner wall of the shell. Good sealing performance may lead to increased resistance to valve core rotation, which in turn requires a higher-power drive device, resulting in a large and bulky structure, which not only takes up a large space but also increases material costs.

[0018] Fourth, the inching mechanical opening and closing type: the reference core patent is 1987-US4713847A1;

[0019] As for the known technologies, the mechanical type has many parts and components, is prone to corrosion and failure in a humid environment, and has no active condensate drainage technology.

[0020] Therefore, with respect to the prior art, on the basis of the basic technical solution of a vertically inserted cartridge valve, how to achieve performance requirements such as high sewage discharge efficiency, low energy consumption, high conveying efficiency, easy disassembly and assembly, good sealing of the joint surface, shock absorption and noise reduction, and active discharge of condensed water is a technical problem that needs to be solved urgently. The present invention has developed a vacuum sewage valve to solve the problems existing in the prior art. After searching, no technical solutions identical or similar to the present invention were found. Summary of the invention

[0021] The purpose of the present invention is to provide a vacuum drain valve to solve the problems of low drain efficiency and conveying efficiency, poor sealing performance, high noise during operation, poor structural performance resulting in inconvenient disassembly and assembly, and inconvenient condensate discharge in the valve body structure used in vacuum toilets in the prior art.

[0022] The technical solution of the present invention is: a vacuum sewage valve, comprising a valve body, a main valve core assembly arranged inside the valve body for realizing the opening and closing of the valve body, and an inner valve core assembly arranged inside the main valve core assembly for realizing the disconnection and sealing inside the valve body; the valve body has a connecting flow channel inside, and the inside of the valve body is used to intermittently introduce air or form a vacuum; the main valve core assembly is arranged in the valve body, and realizes telescopic movement toward one side of the connecting flow channel through the ventilation state inside the valve body; the inner valve core assembly is arranged on the side of the main valve core assembly biased towards the connecting flow channel, and is used to realize the sealing between the end of the main valve core assembly and the inner wall of the connecting flow channel.

[0023] Preferably, the valve body comprises an upper shell body and a lower shell body which are internally connected, the lower shell body is provided with an inner hole which connects the upper shell body and the lower shell body, and the connecting flow channel is provided through the lower shell body; the outer wall of the valve body is also provided with a control interface which is connected with the interior and is used for intermittently introducing air or forming a vacuum, an air interface, and a vacuum interface which continuously forms a vacuum; the main valve core assembly comprises a first compression spring, a main valve core and a plug which are arranged in sequence from top to bottom, the main valve core is plugged into the inner hole, and the upper end has a sealing guide plate which is arranged in an integral structure with the main valve core, and the sealing guide plate divides the interior of the upper shell body into a first upper chamber and a first lower chamber; the first upper chamber and the first lower chamber realize the lifting and lowering movement of the main valve core by changing the ventilation state of the control interface; the first The compression spring is arranged in the first upper chamber and is between the upper wall of the upper shell and the upper wall of the sealing guide plate; the plug is fixed on the side of the valve core that is biased towards the connecting flow channel, and the connecting flow channel is disconnected by moving toward the side of the connecting flow channel; the inner valve core assembly includes an inner valve core, a pair of sliders and a special-shaped rubber sealing ring arranged in sequence from top to bottom; the inner valve core divides the interior of the main valve core into a second upper chamber and a second lower chamber, and the main valve core is provided with a negative pressure pipeline extending to the side wall and connected to the second upper chamber, and a vacuum pipeline connected to the second lower chamber; the negative pressure pipeline and the vacuum pipeline realize the lifting and lowering movement of the inner valve core through the change of pressure difference; the special-shaped rubber sealing ring is nested on the outer wall of the plug, and realizes the sealing contact with the inner wall of the connecting flow channel through the push of the inner valve core and a pair of sliders.

[0024] Preferably, the control interface is arranged on the side wall of the upper shell and is connected to the first upper chamber; the air interface is arranged on the side wall of the lower shell and is connected to the first lower chamber; the vacuum interface is arranged on the side wall of the lower shell and is connected to the connecting flow channel, and one end of the connecting flow channel that is biased towards the vacuum interface is a negative pressure flow end, and the other end is a sewage flow end; the vacuum pipeline is located on the side that is biased towards the negative pressure flow end, and the negative pressure pipeline is located on the side that is biased towards the sewage flow end.

[0025] Preferably, the plug has a hemispherical structure, with a pair of wedge-shaped platforms in an eight-shaped shape in the middle of the upper end surface, and an annular groove is provided on the outer wall along the vertical circumferential direction; a pair of sliders are contacted and arranged on the wedge-shaped platform, and the special-shaped rubber sealing ring is nested in a U shape in the annular groove, with both ends extending upward and making the pair of sliders contact with the inner wall of the end of the special-shaped rubber sealing ring; the inner valve core is arranged above the pair of sliders, and the lower end is in contact with the end of the slider, and the pair of sliders are moved along the wedge-shaped platform through lifting and lowering motion, thereby changing the end opening size of the U-shaped structure of the special-shaped rubber sealing ring.

[0026] Preferably, an exhaust pipe and a one-way valve assembly arranged inside the exhaust pipe for controlling the on-off of the exhaust pipe are also provided inside the main valve core assembly; the exhaust pipe is arranged from top to bottom along the main valve core and the side of the plug, and an upper air supply hole and a lower air supply hole connected to the exhaust pipe are also provided on the side wall; a noise-reducing exhaust interface is provided on the side wall of the lower shell body, and is used to be connected with the upper air supply hole when the valve body is closed, and to be connected with the lower air supply hole when the valve body is opened; the one-way valve assembly is in the exhaust pipe between the upper air supply hole and the lower air supply hole.

[0027] Preferably, the one-way valve assembly includes a guide sleeve nested and fixed in the exhaust pipe, a guide rod whose lower end is plugged into the guide sleeve, and a second compression spring sleeved on the outside of the guide rod; the outer diameter of the upper end of the guide rod is the same as the inner diameter of the exhaust pipe, and a plurality of air guide grooves arranged in the vertical direction are evenly distributed on the outer wall, and the lower end of the guide rod is provided with a ventilation groove arranged through the side wall, and the overlap and staggered of the ventilation groove and the inner wall of the guide sleeve are achieved by the movement of the guide rod along the exhaust direction, thereby realizing the opening and closing of the exhaust pipe; the second compression spring is arranged between the upper end surface of the guide sleeve and the upper end of the guide rod, and the one-way valve assembly is in a normally open state when the valve body is in a closed state.

[0028] Preferably, a sealing rod coaxially arranged with the exhaust pipeline is fixed at the upper end of the upper shell body, and the lower end face of the sealing rod is plugged into and fits in the exhaust pipeline. The rise of the main valve core assembly drives the one-way valve assembly to rise, so that the lower end of the sealing rod abuts against the upper end of the guide rod to achieve the closing of the one-way valve assembly.

[0029] Preferably, the central axis of the sealing rod and the air extraction pipeline is staggered with respect to the central axis of the main valve core assembly.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] (1) The present invention adopts the pressure difference driving technology to realize the movement of the main valve core assembly and the inner valve core assembly, thereby realizing the opening and closing of the vacuum sewage valve, and the efficient sealing of the vacuum sewage valve in the closed state; the internal connecting flow channel for sewage discharge adopts a streamlined design, with minimal flow resistance, maximum flow efficiency, and optimal vacuum sewage transportation efficiency.

[0032] (2) When the vacuum drain valve is in working state, when the main valve core assembly is about to open and close, the air supply and noise reduction can be achieved through the exhaust pipeline, and the odor can be extracted at any time. When the vacuum drain valve is not in working state, the odor can be extracted through the exhaust pipeline by inching. The overall structure further improves the sewage (sewage and odor) efficiency.

[0033] (3) The first upper chamber and the first lower chamber adopt active condensate discharge technology. The condensate inside the vacuum drain valve can be discharged through the control interface and the air interface. If the condensate cannot be discharged from the upper shell in a timely and effective manner, the requirements of the working environment inside the vacuum drain valve will not be met after a long time, thereby greatly reducing the working efficiency and service life of the equipment. Therefore, effective condensate discharge technology can effectively meet the relative dryness of the interior of the upper shell.

[0034] (4) The main valve core assembly is coaxially arranged with the inner valve core assembly, and realizes simultaneous closing (closing of the connecting flow channel) and sealing (the special-shaped rubber sealing ring realizes the sealing at the intersection line of the connecting flow channel and the plug). The exhaust pipeline and the one-way valve assembly are arranged deviating from the central axis of the main valve core assembly and close to the side biased towards the vacuum interface. A sealing rod is also provided at the upper end of the exhaust pipeline for closing the one-way valve assembly when the main valve core assembly is in the open state. The sealing rod can prevent the exhaust pipeline from affecting the function of the vacuum drain valve due to exhaust and air replenishment, and at the same time adopts an asymmetric setting method to limit the circumferential rotation of the main valve core assembly, thereby playing an effective positioning role. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] Figure 1 This is a schematic diagram of the appearance structure of a vacuum drain valve according to the present invention;

[0037] Figure 2 A top view of a vacuum drain valve according to the present invention;

[0038] Figure 3 AA view of a vacuum drain valve according to the present invention;

[0039] Figure 4 This is a BB view of a vacuum drain valve according to the present invention;

[0040] Figure 5 It is a partial cross-sectional structural diagram of a vacuum drain valve according to the present invention;

[0041] Figure 6 It is an exploded view of the main valve core assembly and the inner valve core assembly of the present invention (the first compression spring is omitted);

[0042] Figure 7 It is a cross-sectional view of the main valve core assembly and the inner valve core assembly of the present invention perpendicular to the direction in which a pair of sliders are arranged (the first compression spring is omitted);

[0043] Figure 8 It is a cross-sectional view of the main valve core assembly and the inner valve core assembly of the present invention parallel to the arrangement direction of a pair of sliders (the first compression spring is omitted);

[0044] Fig. 9 It is a top view of the main valve core assembly and the inner valve core assembly of the present invention (the first compression spring is omitted);

[0045] Fig.10 It is a CC view of the main valve core assembly and the inner valve core assembly of the present invention;

[0046] Fig.11 It is a structural schematic diagram of the one-way valve assembly of the present invention;

[0047] Fig.12 It is a schematic structural diagram of the guide rod of the present invention;

[0048] Fig.13 It is a vacuum circuit diagram of a vacuum drain valve in a non-working state according to the present invention;

[0049] Fig.14 It is a vacuum circuit diagram of a vacuum drain valve in working state according to the present invention;

[0050] Fig.15 This is a condensate discharge circuit diagram inside a vacuum drain valve described in the present invention.

[0051] Among them: 1. Valve body;

[0052] 11. upper shell, 12. lower shell, 13. control interface, 14. air interface, 15. vacuum interface, 16. noise removal and air extraction interface, 17. inner hole, 18. connecting flow channel, 19. negative pressure flow end, 110. sewage flow end, 111. first upper chamber, 112. first lower chamber;

[0053] 2. Main valve core assembly;

[0054] 21. first compression spring, 22. sealing guide plate, 23. main valve core, 24. plug;

[0055] 241, wedge-shaped platform, 242, annular groove;

[0056] 3. Internal valve core assembly;

[0057] 31. inner valve core, 32. slider, 33. special-shaped rubber sealing ring, 34. second upper chamber, 35. second lower chamber, 36. vacuum pipeline, 37. negative pressure pipeline;

[0058] 4. Air extraction pipeline;

[0059] 41. one-way valve assembly, 42. upper air supply hole, 43. lower air supply hole, 44. sealing rod;

[0060] 411. Guide sleeve, 412. Guide rod, 413. Air guide groove, 414. Ventilation groove, 415. Second compression spring. DETAILED DESCRIPTION

[0061] The present invention is further described in detail below in conjunction with specific embodiments:

[0062] like Figure 1-5 As shown, a vacuum drain valve is mainly used in vacuum toilets, and its structure includes a valve body 1, a main valve core assembly 2 arranged inside the valve body 1 for realizing the opening and closing of the valve body 1, an inner valve core assembly 3 arranged inside the main valve core assembly 2 for realizing the disconnection and sealing inside the valve body 1, and an exhaust pipeline 4 and a one-way valve assembly 41 arranged on the side of the main valve core assembly 2; simply, the valve body 1 has a connecting flow channel 18 inside, and the inside of the valve body 1 is used to intermittently introduce air or form a vacuum; the main valve core assembly 2 is arranged in the valve body 1, and realizes a telescopic movement toward the side of the connecting flow channel 18 through the ventilation state inside the valve body 1, so as to open or close the valve body 1; the inner valve core assembly 3 is arranged on the side of the main valve core assembly 2 that is biased towards the connecting flow channel 18, and is used to realize the sealing between the end of the main valve core assembly 2 and the inner wall of the connecting flow channel 18; the one-way valve assembly 41 is arranged inside the exhaust pipeline 4, so as to close or open the exhaust pipeline 4, and the exhaust pipeline 4 is used to extract the odor inside and around the outside of the vacuum toilet body.

[0063] More specifically, the detailed structures of the valve body 1, the main valve core assembly 2, the inner valve core assembly 3 and the one-way valve assembly 41 are as follows:

[0064] Combination Figure 1 , Figure 4As shown, the valve body 1 includes an upper shell 11 and a lower shell 12 which are internally connected. The upper shell 11 is a cylindrical structure with an opening at the lower end. The upper end of the lower shell 12 is used to support the upper shell 11 and is fixedly connected to the upper shell 11 by a long rod screw. An inner hole 17 connecting the upper shell 11 and the lower shell 12 is provided in the middle. The central axis of the inner hole 17 is coaxially arranged with the central axis of the upper shell 11. The lower end is provided with a connecting flow channel 18 which is arranged through, and the central axis of the connecting flow channel 18 is arranged perpendicular to the central axis of the inner hole 17. A control interface 13, an air interface 14, a vacuum interface 15 for continuously forming a vacuum, and a noise-removing exhaust interface 16 for connecting with the vacuum interface 15 to realize odor extraction are also provided on the outer wall of the valve body 1.

[0065] like Figure 4 As shown, the main valve core assembly 2 includes a first compression spring 21, a main valve core 23 and a plug 24 arranged in sequence from top to bottom. The main valve core 23 is plugged into the inner hole 17, and the upper end is provided with a sealing guide plate 22 which is arranged in an integral structure with the main valve core 23. The sealing guide plate 22 divides the interior of the upper shell 11 into a first upper chamber 111 and a first lower chamber 112; the lifting and lowering movement of the main valve core 23 is realized by changing the ventilation state of the control interface 13 inside the first upper chamber 111 and the first lower chamber 112; the first compression spring 21 is arranged in the first upper chamber 111 and is located between the inner upper wall of the upper shell 11 and the upper wall of the sealing guide plate 22; the plug 24 is fixed on the side of the valve core that is biased toward the connecting flow channel 18, and the connecting flow channel 18 is disconnected by moving toward the side of the connecting flow channel 18; as shown Figure 6 As shown, the plug 24 is of a hemispherical structure, with a pair of wedge-shaped platforms 241 in an eight-shaped shape in the middle of the upper end surface, and an annular groove 242 is provided on the outer wall along the vertical circumferential direction.

[0066] Combination Figure 6 , Figure 7 , Figure 8 As shown, the inner valve core assembly 3 includes an inner valve core 31, a pair of sliders 32 and a special-shaped rubber sealing ring 33 arranged in sequence from top to bottom; the inner valve core 31 is coaxially arranged with the main valve core 23 and is located in the middle of the lower end of the main valve core 23, dividing the interior of the main valve core 23 into a second upper chamber 34 and a second lower chamber 35, combined with Fig. 9 , Fig.10 As shown, the main valve core 23 is provided with a negative pressure pipeline 37 extending to the side wall and communicating with the second upper chamber 34, and a vacuum pipeline 36 communicating with the second lower chamber 35; the negative pressure pipeline 37 and the vacuum pipeline 36 realize the lifting and lowering movement of the inner valve core 31 through the change of the pressure difference, and the communication route inside the negative pressure pipeline 37 and the vacuum pipeline 36 is as shown in FIG. Fig.10As shown by the dotted lines in the figure; a pair of sliders 32 are contacted and arranged on the wedge-shaped platform 241, and the special-shaped rubber sealing ring 33 is nested in the annular groove 242 in a U shape, and the two ends extend upward so that the pair of sliders 32 are in contact with the inner wall of the end of the special-shaped rubber sealing ring 33; the inner valve core 31 is arranged above the pair of sliders 32, and the lower end is in contact with the end of the slider 32, and the pair of sliders 32 are moved along the wedge-shaped platform 241 by lifting and lowering movement, thereby changing the end opening size of the U-shaped structure of the special-shaped rubber sealing ring 33.

[0067] The movement of the main valve core 23 and the inner valve core 31 is related to the ventilation state inside the valve body 1, so the communication state of each interface at the outer end of the valve body 1 is as follows: the control interface 13 is arranged on the side wall of the upper shell 11 and is connected to the first upper chamber 111; the air interface 14 is arranged on the side wall of the lower shell 12 and is connected to the first lower chamber 112; the vacuum interface 15 is arranged on the side wall of the lower shell 12 and is connected to the communication channel 18, as shown in FIG. Figure 4 As shown, one end of the connecting channel 18 that is biased toward the vacuum interface 15 is the negative pressure flow end 19, and the other end is the sewage flow end 110; the vacuum pipeline 36 is located on the side that is biased toward the negative pressure flow end 19, and the negative pressure pipeline 37 is located on the side that is biased toward the sewage flow end 110; the sewage flow direction inside the connecting pipeline is from the sewage flow end 110 to the negative pressure flow end 19.

[0068] like Figure 5 As shown, a suction pipeline 4 and a one-way valve assembly 41 arranged inside the suction pipeline 4 for controlling the on-off of the suction pipeline 4 are also provided on one side of the main valve core assembly 2 which is biased toward the negative pressure flow end 19; Fig.10 As shown, the air extraction pipeline 4 is arranged from top to bottom along the side of the main valve core 23 and the plug 24, and the side wall is also provided with an upper air filling hole 42 and a lower air filling hole 43 connected to the air extraction pipeline 4; the noise removal air extraction interface 16 is arranged on the side wall of the lower shell 12, and is used to be connected to the upper air filling hole 42 when the valve body 1 is closed, and to be connected to the lower air filling hole 43 when the valve body 1 is opened; the one-way valve assembly 41 is located in the air extraction pipeline 4 between the upper air filling hole 42 and the lower air filling hole 43; as shown in FIG. Fig.11 As shown, the one-way valve assembly 41 includes a guide sleeve 411 nested and fixed in the exhaust pipeline 4, a guide rod 412 whose lower end is plugged into the guide sleeve 411, and a second compression spring 415 sleeved on the outer side of the guide rod 412; Fig.12As shown, the outer diameter of the upper end of the guide rod 412 is the same as the inner diameter of the exhaust pipe 4, and a plurality of air guide grooves 413 arranged in the vertical direction are evenly arranged on the outer wall. The lower end of the guide rod 412 is provided with a ventilation groove 414 arranged through the side wall. The ventilation groove 414 and the inner wall of the guide sleeve 411 are overlapped and staggered by the movement of the guide rod 412 along the exhaust direction, thereby realizing the on-off of the exhaust pipe 4; the second compression spring 415 is arranged between the upper end surface of the guide sleeve 411 and the upper end of the guide rod 412, as shown in FIG. Fig.13 As shown, when the valve body 1 is in the closed state, the one-way valve assembly 41 is in the normally open state, which plays the role of inching the odor extraction. The extraction route is shown by the dotted line in the figure; Fig.14 As shown, when the valve body 1 is in the open state, the one-way valve assembly 41 is in the closed state due to the action of the sealing rod 44, so as to prevent the vacuum interface 15 from being connected to the first lower chamber 112 and causing the valve body 1 to fail in function. At the same time, it plays the role of replenishing air and reducing noise when the main valve core assembly 2 is about to open and close. The air extraction route is shown by the dotted line in the figure.

[0069] Regarding the structure of the sealing rod 44, it is fixed at the upper end of the upper shell 11 and is coaxially arranged with the exhaust pipe 4. The lower end surface of the sealing rod 44 is plugged into the exhaust pipe 4. The rise of the main valve core assembly 2 drives the one-way valve assembly 41 to rise, so that the lower end of the sealing rod 44 abuts against the upper end of the guide rod 412 to close the one-way valve assembly 41. The sealing rod 44 mainly has the following two functions:

[0070] First, it prevents the vacuum pipeline 4 from affecting the function of the vacuum drain valve due to vacuum and air replenishment; when the main valve core assembly 2 of the vacuum drain valve is in the closed state, it prevents the vacuum interface 15 from not connecting to the first upper chamber 111 and causing the main valve core assembly 2 to fail in function; when the main valve core assembly 2 of the vacuum drain valve is in the open state, it prevents the vacuum interface 15 from not connecting to the first lower chamber 112 and causing the main valve core assembly 2 to fail in function.

[0071] Secondly, the sealing rod 44 is arranged asymmetrically, that is, it is arranged away from the central axis of the main valve core assembly 2, so as to limit the circumferential rotation of the main valve core assembly 2 and play an effective positioning role.

[0072] The working principle of the present invention is as follows:

[0073] (1) Opening and closing of vacuum drain valve:

[0074] When the vacuum sewage valve is in a non-working state, air is introduced into the control interface 13, and the air pressure inside the first upper chamber 111 and the first lower chamber 112 is the same. The main valve core assembly 2 is lowered by the first compression spring 21. At this time, the main valve core assembly 2 divides the inside of the connecting flow channel 18 into almost two parts, thereby causing the pressure at the negative pressure flow end 19 to decrease, while the pressure at the sewage flow end 110 to increase. Since the vacuum pipeline 36 is on the side biased toward the negative pressure flow end 19, the negative pressure pipeline 37 is on the side biased toward the sewage flow end 110, and the vacuum pipeline 36 is connected to the second lower chamber 35, and the negative pressure pipeline 37 is connected to the second upper chamber 34, the pressure in the second lower chamber 35 is reduced, and the pressure in the second upper chamber 34 is increased, the inner valve core 31 descends, pushing a pair of sliders 32 to move to both sides along the wedge-shaped platform 241, and then pushing the special-shaped rubber sealing ring 33, and finally achieving the sealing at the intersection line of the connecting flow channel 18 and the plug 24, and achieving the closure and effective sealing of the connecting flow channel 18.

[0075] When the vacuum sewage valve is in working state, vacuum is introduced into the control interface 13, the air pressure in the first upper chamber 111 is less than the air pressure in the first lower chamber 112, the main valve core assembly 2 overcomes the force of the first compression spring 21 and rises, at this time the connecting flow channel 18 is opened to discharge sewage, the air pressure in the negative pressure pipeline 37 and the vacuum pipeline 36 is the same, then the pressure difference in the second upper chamber 34 and the second lower chamber 35 disappears, the inner valve core 31 moves up, the pair of sliders 32 retreat, and the special-shaped rubber sealing ring 33 is reset to reduce the clamping force.

[0076] (2) Extracting odor and replenishing air:

[0077] When the vacuum drain valve is in a non-operating state, the upper air supply hole 42 is connected to the noise removal air extraction interface 16. Fig.13 As shown, at this time, the noise reduction exhaust interface 16, the exhaust pipeline 4, the one-way valve assembly 41 (in an open state) and the negative pressure flow end 19 are connected to each other, which are used to suck the odor inside and around the outside of the vacuum toilet into the connecting flow channel 18, playing the role of inching the odor extraction.

[0078] When the vacuum drain valve is in working state, the lower air supply hole 43 is connected with the noise removal air extraction interface 16. Fig.14 As shown, at this time, the noise reduction exhaust port, the lower end of the exhaust pipe 4 and the negative pressure flow end 19 are connected, which is used to suck the odor inside and around the outside of the vacuum toilet into the connecting flow channel 18, so as to extract the odor at any time. At the same time, it can also play the role of replenishing air and reducing noise when the main valve core assembly 2 is about to open and close.

[0079] (3) Condensate discharge inside the upper housing 11:

[0080] like Fig.15As shown, the condensed water inside the first upper chamber 111 is discharged through the control interface 13, and the condensed water inside the first lower chamber 112 is discharged through the air interface 14, wherein the discharge route of the condensed water is shown by the dotted line in the figure.

[0081] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A vacuum drain valve, characterized in that: It comprises a valve body, a main valve core assembly arranged inside the valve body for realizing the opening and closing of the valve body, and an inner valve core assembly arranged inside the main valve core assembly for realizing the disconnection and sealing inside the valve body; the valve body has a connecting flow channel inside, and the valve body is used to intermittently introduce air or form a vacuum inside; the main valve core assembly is arranged in the valve body, and realizes the telescopic movement toward one side of the connecting flow channel through the ventilation state inside the valve body; the inner valve core assembly is arranged on the side of the main valve core assembly deviating from the connecting flow channel, and is used to realize the sealing between the end of the main valve core assembly and the inner wall of the connecting flow channel; The valve body comprises an upper shell and a lower shell which are connected to each other internally, an inner hole which is connected to the upper shell and the lower shell is arranged in the lower shell, and the connecting flow channel is arranged through the lower shell; a control interface, an air interface, and a vacuum interface which are connected to the interior and used for intermittently introducing air or forming a vacuum are also arranged on the outer wall of the valve body; the main valve core assembly comprises a first compression spring, a main valve core and a plug which are arranged in sequence from top to bottom, the main valve core is plugged and fitted in the inner hole, and a sealing guide plate which is arranged in an integral structure with the main valve core at the upper end, and the sealing guide plate divides the interior of the upper shell into a first upper chamber and a first lower chamber; the first upper chamber and the first lower chamber realize the lifting and lowering movement of the main valve core through the change of the ventilation state of the control interface; the first compression The spring is arranged in the first upper chamber and is located between the upper wall of the upper shell and the upper wall of the sealing guide plate; the plug is fixed on the side of the valve core that is biased towards the connecting flow channel, and the connecting flow channel is disconnected by moving toward the side of the connecting flow channel; the inner valve core assembly includes an inner valve core, a pair of sliders and a special-shaped rubber sealing ring arranged in sequence from top to bottom; the inner valve core divides the interior of the main valve core into a second upper chamber and a second lower chamber, and the main valve core is provided with a negative pressure pipeline extending to the side wall and communicating with the second upper chamber, and a vacuum pipeline communicating with the second lower chamber; the negative pressure pipeline and the vacuum pipeline realize the lifting and lowering movement of the inner valve core through the change of pressure difference; the special-shaped rubber sealing ring is nested on the outer wall of the plug, and realizes the sealing contact with the inner wall of the connecting flow channel through the push of the inner valve core and a pair of sliders; The control interface is arranged on the side wall of the upper shell and is in communication with the first upper chamber; the air interface is arranged on the side wall of the lower shell and is in communication with the first lower chamber; the vacuum interface is arranged on the side wall of the lower shell and is in communication with the connecting flow channel, one end of the connecting flow channel that is biased towards the vacuum interface is a negative pressure flow end, and the other end is a sewage flow end; the vacuum pipeline is located on the side that is biased towards the negative pressure flow end, and the negative pressure pipeline is located on the side that is biased towards the sewage flow end; The plug is a hemispherical structure, with a pair of wedge-shaped platforms in an eight-shaped shape in the middle of the upper end surface, and an annular groove is provided on the outer wall along the vertical circumferential direction; a pair of sliders are contacted and arranged on the wedge-shaped platform, and the special-shaped rubber sealing ring is nested in the annular groove in a U shape, and the two ends extend upward and make the pair of sliders contact with the inner wall of the end of the special-shaped rubber sealing ring; the inner valve core is arranged above the pair of sliders, and the lower end is in contact with the end of the slider, and the pair of sliders are moved along the wedge-shaped platform through lifting and lowering movements, thereby changing the end opening size of the special-shaped rubber sealing ring in the U-shaped structure; The main valve core assembly is also provided with an exhaust pipeline and a one-way valve assembly arranged inside the exhaust pipeline for controlling the on-off of the exhaust pipeline; the exhaust pipeline is arranged from top to bottom along the main valve core and the side of the plug, and an upper air-filling hole and a lower air-filling hole connected to the exhaust pipeline are also arranged on the side wall; a noise-reducing exhaust interface is arranged on the side wall of the lower shell body, and is used to be connected with the upper air-filling hole when the valve body is closed, and is connected with the lower air-filling hole when the valve body is opened; the one-way valve assembly is in the exhaust pipeline between the upper air-filling hole and the lower air-filling hole; The one-way valve assembly includes a guide sleeve nested and fixed in the exhaust pipe, a guide rod whose lower end is plugged into the guide sleeve, and a second compression spring sleeved on the outside of the guide rod; the outer diameter of the upper end of the guide rod is the same as the inner diameter of the exhaust pipe, and a plurality of air guide grooves arranged in the vertical direction are evenly distributed on the outer wall, and the lower end of the guide rod is provided with a ventilation groove arranged through the side wall, and the overlap and stagger of the ventilation groove and the inner wall of the guide sleeve are achieved by the movement of the guide rod along the exhaust direction, thereby realizing the on and off of the exhaust pipe; the second compression spring is arranged between the upper end surface of the guide sleeve and the upper end of the guide rod, and when the valve body is in a closed state, the one-way valve assembly is in a normally open state.

2. A vacuum drain valve according to claim 1, characterized in that: A sealing rod coaxially arranged with the exhaust pipeline is fixed at the upper end of the upper shell body, and the lower end surface of the sealing rod is plugged into and fitted in the exhaust pipeline. The rise of the main valve core assembly drives the one-way valve assembly to rise, so that the lower end of the sealing rod abuts against the upper end of the guide rod to achieve the closing of the one-way valve assembly.

3. A vacuum drain valve according to claim 2, characterized in that: The central axis of the sealing rod and the air extraction pipeline is staggered with the central axis of the main valve core assembly.

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