Normally open one-way valve, shutdown pressure relief system and cleaning robot

Abstract

The invention relates to the technical field of one-way valves, in particular to a normally-open one-way valve, and further relates to a shutdown pressure relief system and a cleaning robot. The normally-open type one-way valve comprises a valve deck, a valve body and a valve element, a sealing cavity is defined by the valve deck and the valve body, a pressure relief hole communicated with the sealing cavity is formed in the valve deck, and a fluid channel communicated with the sealing cavity is formed in the valve body. The valve element is movably arranged in the sealing cavity and has a first state and a second state. In the first state, the pressure relief hole, the sealing cavity and the fluid channel are communicated with one another; and in the second state, the valve element abuts against and is matched with the inner wall of the valve deck so as to divide the sealing cavity into a first cavity and a second cavity, the pressure relief hole communicates with the first cavity, and the fluid channel communicates with the second cavity. The one-way valve serves as an unpowered one-way valve, the valve cover, the valve body and the valve element are matched with one another, the one-way valve is in a closed state when fluid passes through the valve body, the one-way valve is in a closed state when no fluid passes through the valve body, and the normally-open function of the one-way valve is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of one-way valves, and in particular to a normally open one-way valve, and also to a shutdown pressure relief system and a cleaning robot. Background Art

[0002] From the perspective of power source, one-way valves are divided into unpowered one-way valves and electrically controlled valves. For unpowered one-way valves, the related technologies mostly use normally closed structures, such as normally closed film structures, duckbill rubber structures, or spring self-restoring structures. When there is no fluid passing through the valve, the valve body or valve core automatically closes under the action of deformation stress or spring force to form a normally closed one-way valve; when fluid passes through the valve body in a specified direction, the impact force of the fluid causes the valve body or valve core to displace, forming a fluid channel, and the valve opens. It is precisely because the unpowered one-way valve is closed through the deformation of the valve body, valve core, spring, or its own material that it can only be opened when there is fluid passing through, and closed when there is no fluid passing through.

[0003] Unpowered check valves often cannot achieve the normally open function, while normally open check valves are needed in specific scenarios. Although the electric control valve can be used to drive the valve core to rotate and achieve free switching, the electric control valve has disadvantages such as high cost, short life, difficult maintenance, and long production cycle compared to unpowered check valves. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present application is to provide a non-powered one-way valve that can realize a normally open function. In order to solve the above technical problem, the present application provides a normally open one-way valve, a shutdown pressure relief system and a cleaning robot.

[0005] In order to achieve the above-mentioned purpose, according to a first aspect of an embodiment of the application, a normally open one-way valve is provided.

[0006] The normally open one-way valve provided in the embodiment of the present application comprises a valve cover, a valve body and a valve core, wherein the valve cover and the valve body together form a sealed cavity, a pressure relief hole communicating with the sealed cavity is formed on the valve cover, and a fluid channel communicating with the sealed cavity is formed in the valve body;

[0007] The valve core is movably arranged in the sealing cavity, and the valve core has a first state and a second state; in the first state, the pressure relief hole, the sealing cavity and the fluid channel are connected to each other; in the second state, the valve core abuts and cooperates with the inner wall of the valve cover to separate the sealing cavity into a first chamber and a second chamber, the pressure relief hole is connected to the first chamber, and the fluid channel is connected to the second chamber.

[0008] Furthermore, a through portion is provided on the valve body, and the through portion connects the sealing cavity and the fluid channel; in the first state, the pressure relief hole, the sealing cavity, the through portion and the fluid channel are connected to each other; in the second state, the through portion is connected to the second chamber.

[0009] Furthermore, the through-portion is a clearance groove provided at the edge of the fluid channel port;

[0010] Furthermore, the through portion is a through hole opened in the valve body.

[0011] Furthermore, the valve cover is used to form an inner wall of the sealing cavity, which includes a first section close to the valve body and a second section away from the valve body. The portion of the sealing cavity located in the second section gradually shrinks in cross-section in the direction away from the valve body. In the second state, the valve core abuts against the second section.

[0012] Furthermore, the valve core is in the shape of a sphere.

[0013] Furthermore, the valve core is shaped like a cylinder, and the valve core includes a main body and a sealing portion that are connected to each other. The side of the sealing portion forms a sealing surface in the shape of a frustum or a cone, and the shape of the second section is a frustum or a cone that matches the sealing surface.

[0014] Furthermore, when the valve core is moving, the orthographic projection of the valve core on the end surface of the valve body facing the sealing cavity completely covers the port of the fluid channel facing the sealing cavity.

[0015] Furthermore, the fluid channel includes a transition section and an acceleration section that are connected to each other, the acceleration section is closer to the sealing cavity than the transition section, and the diameter of the transition section is greater than the diameter of the acceleration section.

[0016] Furthermore, one end of the valve cover forms an assembly port connected to the sealing cavity, the inner wall of the valve cover forms a groove, and the valve body includes a first disk body, a first connecting section and a second disk body connected in sequence, the first disk body is cooperatively connected to the groove, and the second disk body is fitted and connected to the end surface of the valve cover on one side facing the first disk body.

[0017] Furthermore, the material of the valve cover is rubber, and the material of the valve core is stainless steel or plastic.

[0018] Furthermore, an elastic member is provided between the valve cover and the valve core, and the elastic member always has a tendency to move the valve core to the first state.

[0019] In order to achieve the above-mentioned purpose, according to a second aspect of the embodiment of the application, a shutdown pressure relief system is provided.

[0020] The shutdown pressure relief system provided according to the embodiment of the present application includes a pump, a liquid outlet pipe and the normally open one-way valve provided in the first aspect of the present application, wherein the pump is used to drive the working medium; the liquid outlet pipe is connected to the outlet of the pump; the normally open one-way valve is connected to the tube wall of the liquid outlet pipe, and the fluid channel is connected to the liquid outlet pipe.

[0021] In order to achieve the above-mentioned purpose, according to the third aspect of the application embodiment, a cleaning robot is provided.

[0022] The cleaning robot provided according to the embodiment of the present application includes a medium box and a shutdown pressure relief system provided in the second aspect of the present application. The medium box is used to store the working medium, and the pump is used to drive the working medium in the medium box through the liquid outlet pipe to the medium component.

[0023] In the normally open one-way valve provided in the embodiment of the present application, when no fluid passes through the fluid channel of the valve body, the valve core is in the first state, and the pressure relief hole, the sealing cavity and the fluid channel are connected in sequence, so that the airflow between the pressure relief hole and the fluid channel can be connected, and the conducting state of the one-way valve is realized; when fluid passes through the circulation channel of the valve body, the abutting area of ​​the valve core and the inner wall of the valve cover forms an annular contact zone in the circumferential direction, thereby separating the sealing cavity into a first chamber and a second chamber, and the first chamber and the second chamber are isolated from each other and cannot be connected, so that the airflow between the pressure relief hole and the circulation channel cannot be conducted, and the closed state of the one-way valve is realized. As an unpowered one-way valve, the one-way valve, through the mutual cooperation of the valve cover, the valve body and the valve core, is in a closed state when fluid passes through the valve body, and is in an open state when no fluid passes through the valve body, thereby realizing the normally open function of the one-way valve. Compared with the normally closed one-way valves in the prior art, the normally open one-way valve provided in the embodiment of the present application breaks the technical barriers in the prior art and realizes the normally open function of the one-way valve in the absence of power. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0025] Figure 1 A cross-sectional view schematically shows the assembly relationship between the valve cover and the valve body in the normally open one-way valve provided in the embodiment of the present application;

[0026] Figure 2 A cross-sectional view of a valve cover in a normally open one-way valve provided in an embodiment of the present application is schematically provided;

[0027] Figure 3A three-dimensional diagram of a valve body in a normally open one-way valve provided in an embodiment of the present application is schematically provided;

[0028] Figure 4 A cross-sectional view of a valve body in a normally open one-way valve provided in an embodiment of the present application is schematically provided;

[0029] Figure 5 The structural explosion diagram of the first normally open one-way valve provided in the embodiment of the present application is schematically given;

[0030] Figure 6 A cross-sectional view of the first normally open one-way valve in a conducting state provided in an embodiment of the present application is schematically provided;

[0031] Figure 7 A cross-sectional view of a first normally open one-way valve in a closed state provided in an embodiment of the present application is schematically provided;

[0032] Figure 8 A structural explosion diagram of a second normally open one-way valve provided in an embodiment of the present application is schematically provided;

[0033] Fig. 9 A cross-sectional view of a second normally open one-way valve in a conducting state provided in an embodiment of the present application is schematically provided;

[0034] Fig.10 A cross-sectional view of a second normally open one-way valve in a closed state provided in an embodiment of the present application is schematically shown;

[0035] Fig.11 The structural diagram of the shutdown pressure relief system provided in the embodiment of the present application is schematically given.

[0036] In the figure:

[0037] 100, valve cover; 110, pressure relief hole; 120, first section; 130, second section; 140, groove;

[0038] 200, valve body; 210, fluid channel; 211, port; 212, transition section; 213, acceleration section; 220, end face; 231, air avoidance groove; 232, through hole; 240, first disk body; 250, first connecting section; 260, second disk body; 270, second connecting section;

[0039] 300, valve core; 310, ball; 320, column; 321, main body; 322, sealing part;

[0040] 400, sealed chamber; 410, first chamber; 420, second chamber;

[0041] 1. Normally open one-way valve; 2. Pump; 3. Liquid outlet pipe; 301. Negative pressure section; 302. Liquid storage section. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include units that are not explicitly listed or inherent to these products or devices.

[0044] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0046] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0048] Figure 1-10The structural diagram of the normally open one-way valve 1 provided in the embodiment of the present application is given. The main structure of the normally open one-way valve 1 includes a valve cover 100, a valve body 200 and a valve core 300. Among them, Figure 1 is a cross-sectional view of the assembly relationship between the valve cover 100 and the valve body 200, Figure 2 is a cross-sectional view of the valve cover 100, Figure 3 is a three-dimensional diagram of the valve body 200, Figure 4 is a cross-sectional view of the valve body 200, Figure 5-7 The schematic diagram of the structure of the first normally open check valve is shown in FIG. Figure 8-10 This is a schematic diagram of the structure of the first normally open one-way valve.

[0049] The valve cover 100 is connected to the valve body 200, and the valve cover 100 and the valve body 200 enclose a sealed cavity 400. The valve cover 100 is provided with a pressure relief hole 110 communicating with the sealed cavity 400, and the valve body 200 is formed with a fluid channel 210 communicating with the sealed cavity 400; the valve core 300 is movably arranged in the sealed cavity 400, and the valve core 300 has a first state and a second state during the movement in the sealed cavity 400; when the valve core 300 is in the first state, the pressure relief hole 110 is opened. 110, the sealing cavity 400 and the fluid channel 210 are connected with each other; when the valve core 300 is in the second state, the valve core 300 abuts against the inner wall of the valve cover 100 to separate the sealing cavity 400 into a first chamber 410 and a second chamber 420, and the first chamber 410 and the second chamber 420 are isolated from each other and cannot be connected, the pressure relief hole 110 on the valve cover 100 is connected with the first chamber 410, and the fluid channel 210 is connected with the second chamber 420.

[0050] In the above embodiment, the valve cover 100 is provided with a pressure relief hole 110, which is responsible for conducting air inside and outside the valve body 200 when there is no fluid passing through the fluid channel 210 of the valve body 200. Specifically, the valve core 300 is located in a sealed cavity 400 formed by the valve cover 100 and the valve body 200. Figure 6 and Fig. 9 As shown, when no fluid passes through the fluid channel 210 of the valve body 200, the valve core 300 will not be impacted by the fluid, the valve core 300 is in a free state in the sealing cavity 400, and there will be a gap between the valve core 300 and the inner wall of the valve cover 100. At this time, the valve core 300 is in the first state, the pressure relief hole 110, the sealing cavity 400 and the fluid channel 210 are connected in sequence, and the air flow between the pressure relief hole 110 and the fluid channel 210 can be connected, and the conductive state of the one-way valve is realized; as shown in FIG. Figure 7 and Fig.10As shown, when fluid passes through the circulation channel of the valve body 200, the fluid enters the sealing cavity 400 through the fluid channel 210, and the fluid flowing out of the fluid will impact the valve core 300. The valve core 300 moves under the action of pressure and abuts against the inner wall of the valve cover 100. The abutment area between the valve core 300 and the inner wall of the valve cover 100 forms an annular contact zone in the circumferential direction, thereby separating the sealing cavity 400 into a first chamber 410 and a second chamber 420. The first chamber 410 and the second chamber 420 are isolated from each other and cannot be connected. The pressure relief hole 110 on the valve cover 100 is connected to the first chamber 410, and the fluid channel 210 is connected to the second chamber 420. In this way, the airflow between the pressure relief hole 110 and the circulation channel cannot be conducted, thereby realizing the closed state of the one-way valve. The one-way valve provided in this embodiment is a non-powered one-way valve. Through the mutual cooperation of the valve cover 100, the valve body 200 and the valve core 300, the one-way valve is in a closed state when fluid passes through the valve body 200, and is in a closed state when no fluid passes through the valve body 200, thereby realizing the normally open function of the one-way valve. In addition, the normally open one-way valve 1 of this embodiment is a non-powered one-way valve. Compared with the electric control valve, it also has the advantages of low cost, long life, simple maintenance, and short production cycle.

[0051] It should be noted that in the above embodiment, preferably, during the movement of the valve core 300, the orthographic projection of the valve core 300 on the end surface 220 of the valve body 200 facing the sealed cavity 400 completely or mostly covers the port 211 of the fluid channel 210 facing the sealed cavity 400. The purpose of such a design is to enable the fluid from the fluid channel 210 to flow into the sealed cavity 400 to be completely or mostly blocked by the valve core 300, thereby pushing the valve core 300 to move to the second state, completing the closing of the one-way valve, and preventing the fluid flowing out of the fluid channel 210 from bypassing the valve core 300 and communicating with the pressure relief hole 110, causing the valve core 300 to be unable to move, resulting in the failure of the one-way valve to close.

[0052] In the normally open one-way valve 1 provided in the above embodiment, as Figure 1 , Figure 3 and Figure 4As shown, the side of the valve body 200 facing the sealing cavity 400 is an end face 220, and the fluid channel 210 is formed with a port 211 on the end face 220. In some usage scenarios, the valve core 300 may contact the end face 220 or the port 211, so that the valve core 300 completely closes the port 211. For example, when the normally open one-way valve 1 is placed vertically, the valve body 200 is located below the valve core 300. At this time, the valve core 300 will contact the end face 220 of the valve body 200 under the action of gravity. If the bottom surface of the valve core 300 is a spherical surface or a plane with a larger area, the valve core 300 will completely close the port 211, resulting in the fluid channel 210 in the sealing cavity 400 and the valve body 200 being unable to communicate, and the normally open one-way valve 1 cannot work normally. Based on this, in some embodiments, a through-portion is further provided on the valve body 200 of the normally open one-way valve 1, and the through-portion connects the sealed cavity 400 and the fluid channel 210; in the first state, the pressure relief hole 110, the sealed cavity 400, the through-portion and the fluid channel 210 are mutually connected; in the second state, the through-portion is connected to the second chamber 420. The through-portion is provided to allow a communication passage between the valve core 300 and the valve body 200 when no fluid passes through the fluid channel 210 of the valve body 200, thereby avoiding the blockage of the passage for the internal and external air to pass through after the valve core 300 completely blocks the port 211 of the fluid channel 210, thereby achieving the effect of opening the one-way valve. That is, after the valve core 300 completely blocks the port 211 of the fluid channel 210, the sealed cavity 400 can still be connected to the fluid channel 210 through the through-portion.

[0053] As a preferred embodiment, Figure 3-7 As shown, the through portion can be a gas avoidance groove 231 opened on the edge of the port 211 of the fluid channel 210. In this case, the gas avoidance groove 231 and the port 211 are designed as an integral whole. For example, the shape of the port 211 of the fluid channel 210 can be designed as a circular hole, and the gas avoidance groove 231 is a groove 140 structure formed by further recessing the edge of the circular port 211. The shape of the gas avoidance groove 231 can be semicircular, arc-shaped or long strip, as long as the gas avoidance groove 231 can still be connected to the sealing cavity 400 when the valve core 300 is in contact with the end face 220.

[0054] As a preferred embodiment, Figure 8-10As shown, the through portion may be a through hole 232 opened in the valve body 200. In this case, the through hole 232 is independently arranged relative to the port 211 of the fluid channel 210. The through hole 232 is entirely arranged through the valve body 200. One end of the through hole 232 is located on the end face 220 of the valve body 200 and communicates with the sealing cavity 400, and the other end of the through hole 232 communicates with the fluid channel 210. The specific shape formed by the extension of the through hole 232 may be a straight line, a broken line or a curve, as long as the air port of the through hole 232 on the end face 220 of the valve body 200 can still communicate with the sealing cavity 400 when the valve core 300 is in contact with the end face 220 of the valve body 200.

[0055] In some embodiments, Figure 1 and 2 As shown, the inner wall of the valve cover 100 used to form the sealing cavity 400 includes a first section 120 close to the valve body 200 and a second section 130 away from the valve body 200. The section of the sealing cavity 400 located in the second section 130 gradually decreases in the direction away from the valve body 200. In the second state, as shown in FIG. Figure 7 and 10 As shown, the valve core 300 is in abutment with the second section 130. The area of ​​the first section 120 has a larger cross-section than the area of ​​the second section 130, providing necessary space for the free movement of the valve core 300. The sealing cavity 400 in the area of ​​the second section 130 is in the shape of a bell mouth, so that the valve core 300 can easily complete the abutment with the second section 130 in the process of moving away from the valve body 200, so that the abutment area of ​​the valve core 300 and the second section 130 forms an annular contact zone in the circumferential direction, thereby separating the sealing cavity 400 into a first chamber 410 and a second chamber 420, and making the first chamber 410 and the second chamber 420 isolated from each other and unable to communicate with each other, so as to realize the closing of the normally open one-way valve 1.

[0056] In some embodiments, Figure 5-7As shown, the shape of the valve core 300 can be a sphere 310. The valve core 300 of the sphere 310 structure can have more freedom of movement in the sealing cavity 400, especially when the one-way valve is set horizontally, the valve core 300 of the sphere 310 structure only needs a slight disturbance to roll in the sealing cavity 400, and even when no through-portion is provided on the valve body 200, it is difficult for the sphere 310 to completely block the port 211 of the fluid channel 210, which is more conducive to keeping the one-way valve in a normally open state. When the shape of the valve core 300 is a sphere 310, the through-portion can be selected as either the air avoidance groove 231 or the through hole 232, because the contact area between the spherical valve core 300 and the circular port 211 of the fluid channel 210 is circular, and the air avoidance groove 231 is formed by a complete depression on the edge of the circular port 211, and the spherical valve core 300 will inevitably be unable to block the air avoidance groove 231, and the air avoidance groove 231 can work normally. Preferably, as Figure 6 and 7 As shown, when the valve core 300 is selected as a sphere 310 , the port 211 is expanded so that the port 211 has a larger cross-sectional area. After the sphere 310 abuts against the end surface 220 , the port 211 with a larger cross-section can achieve stable contact and fit with the spherical surface of the sphere 310 .

[0057] In some embodiments, Figure 8-10As shown, the valve core 300 is shaped as a cylinder 320, and the valve core 300 includes a main body portion 321 and a sealing portion 322 that are interconnected. The main body portion 321 may be shaped as a cylinder, and the sealing portion 322 may be shaped as a cone or a frustum. The side of the sealing portion 322 forms a sealing surface in the shape of a frustum or a cone. The valve cover 100 is used to form an inner wall of the sealing cavity 400, including a first section 120 close to the valve body 200 and a second section 130 away from the valve body 200. The portion of the sealing cavity 400 located in the second section 130 has a gradually decreasing cross-section in a direction away from the valve body 200, and the second section 130 is shaped as a frustum or a cone that matches the sealing surface. In this embodiment, on the one hand, the end face 220 of the cylindrical main body 321 facing the fluid channel 210 is a plane, which can better act on the valve core 300 when fluid flows in the fluid channel 210, thereby forming a larger impact force and improving the sensitivity of the valve core 300; on the other hand, the abutment between the sealing surface and the second section 130 is a surface contact, which has a larger contact and sealing area, and can better achieve the isolation between the first chamber 410 and the second chamber 420, thereby avoiding fluid leakage when the one-way valve is in a closed state. When the valve core 300 is a column 320, the through portion is preferably a through hole 232. Since the column 320 has a planar bottom surface, the bottom surface is in surface contact with the end surface 220 of the valve body 200. In order to make the fluid flowing out of the fluid channel 210 exert a greater impact force on the column 320, the bottom surface of the column 320 is preferably able to completely cover the port 211 of the fluid channel 210. If an air avoidance groove 231 integrated with the port 211 is used, the air avoidance groove 231 is also easily closed by the bottom surface of the column 320, resulting in the failure of the communication function of the air avoidance groove 231. In the case of using a through hole 232, one end of the through hole 232 on the end surface 220 of the valve body 200 can be opened at the edge of the end surface 220 to avoid being blocked by the valve body 200. More preferably, the axial length of the main body 321 of the column 320 is greater than the axial length of the second section 130 of the valve cover 100. In such a configuration, Fig. 9 As shown, when the bottom surface of the column 320 is in contact with the end surface 220 of the valve body 200, the connection between the main body 321 and the sealing portion 322 is farther away from the valve body 200 than the connection between the first section 120 and the second section 130. When the column 320 moves radially in the sealing cavity 400, when the sealing portion 322 is in contact with the first section 120, there must be a gap between the main body 321 and the second section 130, and there must be an area at the edge of the end surface 220 that cannot be covered by the column 320. In this way, one end of the through hole 232 on the end surface 220 is opened in the area at the edge of the end surface 220 that cannot be covered by the column 320, so that the through hole 232 can be prevented from being blocked by the valve body 200.

[0058] In some embodiments, Figure 1 and Figure 4 As shown, the fluid channel 210 includes a transition section 212 and an acceleration section 213 connected to each other. The acceleration section 213 is closer to the sealing cavity 400 than the transition section 212, and the diameter of the transition section 212 is larger than the diameter of the acceleration section 213. After the fluid enters the thinner acceleration section 213 from the thicker transition section 212, the fluid flowing through the valve body 200 is squeezed and accelerated, so that the impact force of the fluid on the valve core 300 is greater, ensuring that the valve core 300 can be fully squeezed when it is abutted against the valve cover 100 after the action, so as to completely block the passage of the fluid in the valve cover 100, so as to achieve the effect of closing the one-way valve.

[0059] In some embodiments, an assembly port communicating with the sealing cavity 400 is formed at one end of the valve cover 100, and the valve body 200 is matched and connected with the valve cover 100 through the assembly port. Specifically, a groove 140 is formed on the inner wall of the valve cover 100, and the valve body 200 includes a first plate 240, a first connecting section 250, and a second plate 260 connected in sequence. The first plate 240 is matched and connected with the groove 140, and the second plate 260 is connected to the end surface of the valve cover 100 on one side facing the first plate 240. In this way, the first plate 240 is embedded in the groove 140, and the part of the valve cover 100 located between the groove 140 and the end surface of the valve cover 100 is embedded between the first plate 240 and the second plate 260, thereby achieving a stable connection between the valve cover 100 and the valve body 200. Preferably, the valve body 200 further includes a second connecting section 270 connected to the second disk body 260, the first connecting section 250 and the second connecting section 270 are respectively located on both sides of the second disk body 260, and the second connecting section 270 is used to install the normally open one-way valve 1 in a specific use scenario. For example, the normally open one-way valve 1 can be installed on the wall of a water pipe through the second connecting section 270, and at least a portion of the transition section 212 of the fluid channel 210 is located in the second connecting section 270, and is connected to the inside of the water pipe through the transition section 212, so that the fluid in the water pipe can be introduced into the fluid channel 210. In this embodiment, in order to facilitate the assembly of the valve body 200 and the valve cover 100, at least one of the two can be selected to be a flexible material, so as to facilitate the assembly of the valve body 200 and the valve cover 100 through the assembly port.

[0060] In some embodiments, the material of the valve cover 100 is preferably rubber, and the material of the valve core 300 is preferably stainless steel or plastic. The rubber valve cover 100 can be more fully squeezed with the hard valve core 300 to achieve a better sealing effect.

[0061] In some usage scenarios, it is necessary to set the normally open one-way valve in the reverse vertical direction. At this time, the valve body 200 is located above the valve core 300. Even if there is no fluid in the fluid channel 210 that impacts the valve core 300, the valve core 300 will contact the inner wall of the valve cover 100 under the action of gravity. Then the valve core 300 will enter the second state, and the sealing cavity 400 will be separated into a first chamber 410 and a second chamber 420. The normally open one-way valve 1 is in a closed state when it should be in a conducting state, and cannot work normally. Based on this, in some embodiments, an elastic member is arranged between the valve cover 100 and the valve core 300, and the elastic member always has a tendency to move the valve core 300 to the first state. In this way, in a scenario where the normally open one-way valve needs to be reversed and vertically set, the elastic reset force of the elastic member will overcome the gravity of the valve core 300, so that the valve core 300 remains in the first state in the sealing chamber 400, ensuring that the normally open one-way valve 1 is in a conducting state when there is no fluid impacting the valve core 300 in the fluid channel 210. When there is fluid impacting the valve core 300 in the fluid channel 210, the impact force of the fluid on the valve core 300 will overcome the elastic reset force of the spring, pushing the valve core 300 to the second state, and the normally open one-way valve is in a closed state.

[0062] It should be noted that other structures and operations of the normally open one-way valve 1 provided in the embodiment of the present application are known to ordinary technicians in the field, and can refer to the structure of related devices in the prior art, and will not be described in detail here.

[0063] As a specific application scenario of the normally open one-way valve 1 in the embodiment of the present application, Fig.11 As shown, the embodiment of the present application further provides a shutdown pressure relief system, which includes a pump 2, a liquid outlet pipe 3 and a normally open one-way valve 1, wherein the pump 2 is used to drive the working medium, the liquid outlet pipe 3 is connected to the outlet of the pump 2, and the normally open one-way valve 1 is connected to the pipe wall of the liquid outlet pipe 3. Specifically, the normally open one-way valve 1 can pass through and be connected to the pipe wall through the second connecting section 270, and the fluid channel 210 of the normally open one-way valve 1 is connected to the liquid outlet pipe 3.

[0064] like Fig.11As shown, when a part of the liquid outlet pipe is arranged vertically, if the pump 2 is stopped, the liquid outlet pipe can no longer be connected to the atmosphere through the pump 2. If the working medium is liquid, the liquid working medium usually cannot be completely discharged from the liquid outlet pipe 3. A part of the liquid working medium will remain at the end of the liquid outlet pipe 3 to form a liquid storage section 302, and the liquid outlet pipe between the liquid storage section 302 and the pump 2 forms a negative pressure section 301. The existence of the liquid storage section 302 causes the liquid in the liquid outlet pipe 3 to be unable to be completely discharged, and will drip out of the liquid outlet pipe 3 when slightly disturbed. By arranging the normally open one-way valve 1 of the embodiment of the present application on the liquid outlet pipe 3, the aforementioned problems of liquid storage and dripping can be solved, and the pressure relief of the negative pressure section 301 in the liquid outlet pipe 3 can be achieved. When the pump 2 is working, it will drive the working medium fluid into the liquid outlet pipe 3, and the fluid in the liquid outlet pipe 3 will enter the normally open one-way valve 1 through the fluid channel 210. The fluid in the fluid channel 210 impacts the valve core 300 to move it to the second state, so that the normally open one-way valve 1 is closed, and the working medium fluid in the liquid outlet pipe 3 will not flow out through the normally open one-way valve 1; when the pump 2 stops working, the working medium fluid in the liquid outlet pipe 3 no longer impacts the valve core 300, and flows out under the action of gravity along with the fluid in the liquid outlet pipe 3 The negative pressure section 301 formed in the liquid outlet pipe 3 is connected to the sealed cavity in the normally open one-way valve 1. The pressure difference between the inside and the outside and / or the gravity of the valve core 300 itself will cause the valve core 300 to move from the second state to the first state, so that the normally open one-way valve 1 is turned on. The air in the environment enters the liquid outlet pipe 3 through the pressure relief hole 110, the sealed cavity 400 and the fluid channel 210, so that the negative pressure section 301 is connected to the external air. The working medium fluid in the liquid outlet pipe 3 will all flow out of the liquid outlet pipe 3 under the action of gravity, and no liquid will be stored or dripped.

[0065] Since the shutdown pressure relief system disclosed in the embodiment of the present application includes the normally open one-way valve 1 provided in the above embodiment, the shutdown pressure relief system having the normally open one-way valve 1 also has all the above technical effects, which will not be described one by one here. For other technical features of the normally open one-way valve 1 in the shutdown pressure relief system, please refer to the above embodiment. Other structures and operations of the shutdown pressure relief system are known to ordinary technicians in this field and will not be described in detail here.

[0066] As a specific application scenario of the shutdown pressure relief system of the embodiment of the present application, the embodiment of the present application also provides a cleaning robot, which includes a medium box and the shutdown pressure relief system provided in the aforementioned embodiment, the medium box is used to store the working medium, and the pump is used to drive the working medium in the medium box through the liquid outlet pipe to the medium component.

[0067] As a specific usage scenario, the shutdown pressure relief system is applied to the water spraying system of cleaning equipment. The medium tank is a clean water tank, the pump is a water pump, the working medium is clean water, and the medium components can be cleaning components of a cleaning robot, including but not limited to brushes, roller brushes or rags, etc. The water tank is used to store clean water, and after the water pump works, it drives the clean water in the water tank to be output to the water-using components through the liquid outlet pipe. Among them, the liquid outlet end of the liquid outlet pipe can be directly facing the cleaning component, or the liquid outlet end of the liquid outlet pipe can be directly facing the cleaning component through the nozzle.

[0068] In a cleaning robot, due to structural design considerations and the use of gravity to drain liquid, the cleaning components are often set below the clean water tank, and the direction of the liquid outlet pipe is up and down. If the water is shut down, the liquid outlet pipe can no longer be connected to the atmosphere through the water pump, and the clean water usually cannot be completely discharged from the liquid outlet pipe. A portion of the clean water will remain at the end of the liquid outlet pipe to form a liquid storage section, and the liquid outlet pipe between the liquid storage section and the water pump forms a negative pressure section. The existence of the liquid storage section causes the liquid in the liquid outlet pipe to be unable to be completely drained, and it will drip out of the liquid outlet pipe when slightly disturbed, causing the local area of ​​the cleaning component to be in a humid environment when not working, which is easy to breed bacteria or cause the loss of the cleaning component. In this embodiment, by setting a normally open one-way valve of the embodiment of the present application on the liquid outlet pipe, the aforementioned problems of liquid storage and dripping can be solved, and the pressure relief of the negative pressure section in the liquid outlet pipe can be achieved. When the water pump of the cleaning robot is working normally, it will drive clean water into the liquid outlet pipe, and the clean water in the liquid outlet pipe will enter the normally open one-way valve 1 through the fluid channel 210. The fluid in the fluid channel 210 impacts the valve core 300 to move it to the second state, so that the normally open one-way valve 1 is closed, and the clean water in the liquid outlet pipe 3 will not flow out through the normally open one-way valve 1; when the water pump stops working, the clean water in the liquid outlet pipe 3 no longer impacts the valve core 300, and the clean water in the liquid outlet pipe 3 flows out of the outlet under the action of gravity. The negative pressure section formed in the liquid pipe 3 is connected to the sealed cavity in the normally open one-way valve 1. The pressure difference between the inside and the outside and / or the gravity of the valve core 300 itself will cause the valve core 300 to move from the second state to the first state, so that the normally open one-way valve 1 is turned on. The air in the environment enters the liquid outlet pipe 3 through the pressure relief hole 110, the sealed cavity 400 and the fluid channel 210, so that the negative pressure section 301 is connected to the external air. The working clean water in the liquid outlet pipe 3 will all flow out of the liquid outlet pipe 3 under the action of gravity, and no liquid will be stored or dripped.

[0069] Since the cleaning robot disclosed in the embodiment of the present application includes the shutdown pressure relief system and the normally open one-way valve 1 provided in the above embodiment, the shutdown pressure relief system having the shutdown pressure relief system and the normally open one-way valve 1 also has all the above technical effects, which will not be described one by one here. For other technical features of the shutdown pressure relief system and the normally open one-way valve 1, please refer to the above embodiment. The other structures and operations of the shutdown pressure relief system and the normally open one-way valve are known to ordinary technicians in this field and will not be described in detail here.

[0070] Some embodiments in this specification are described in a progressive or parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A normally open one-way valve, characterized in that: It comprises a valve cover, a valve body and a valve core, wherein the valve cover and the valve body together form a sealed cavity, the valve cover is provided with a pressure relief hole communicating with the sealed cavity, and the valve body is provided with a fluid channel communicating with the sealed cavity; The valve core is movably arranged in the sealing cavity, and the valve core has a first state and a second state; in the first state, the pressure relief hole, the sealing cavity and the fluid channel are connected to each other; in the second state, the valve core abuts and cooperates with the inner wall of the valve cover to separate the sealing cavity into a first chamber and a second chamber, the pressure relief hole is connected to the first chamber, and the fluid channel is connected to the second chamber.

2. The normally open one-way valve according to claim 1, characterized in that: The valve body is also provided with a through portion, which connects the sealing cavity and the fluid channel; in the first state, the pressure relief hole, the sealing cavity, the through portion and the fluid channel are connected to each other; in the second state, the through portion is connected to the second chamber.

3. The normally open one-way valve according to claim 2, characterized in that: The through-hole is a clearance groove provided at the edge of the fluid channel port; or The through portion is a through hole opened in the valve body.

4. The normally open one-way valve according to claim 1, 2 or 3, characterized in that: The valve cover is used to form an inner wall of the sealing cavity, which includes a first section close to the valve body and a second section away from the valve body. The portion of the sealing cavity located in the second section gradually shrinks in cross-section in a direction away from the valve body. In the second state, the valve core abuts against the second section.

5. The normally open one-way valve according to claim 4, characterized in that: The valve core is in the shape of a sphere.

6. The normally open one-way valve according to claim 4, characterized in that: The valve core is in the shape of a cylinder and comprises a main body and a sealing portion which are connected to each other. The side surface of the sealing portion forms a sealing surface in the shape of a frustum or a cone. The shape of the second section is a frustum or a cone which matches the sealing surface.

7. The normally open one-way valve according to claim 1, characterized in that: When the valve core is moving, the orthographic projection of the valve core on the end surface of the valve body facing the sealing cavity completely covers the port of the fluid channel facing the sealing cavity.

8. The normally open one-way valve according to claim 1, characterized in that: The fluid channel comprises a transition section and an acceleration section which are connected to each other. The acceleration section is closer to the sealing cavity than the transition section. The diameter of the transition section is larger than the diameter of the acceleration section.

9. The normally open one-way valve according to claim 1, characterized in that: One end of the valve cover forms an assembly port connected to the sealing cavity, the inner wall of the valve cover forms a groove, the valve body includes a first disk body, a first connecting section and a second disk body connected in sequence, the first disk body is cooperatively connected to the groove, and the second disk body is fitted and connected to the end surface of the valve cover on one side facing the first disk body.

10. The normally open one-way valve according to claim 1, characterized in that: The material of the valve cover is rubber, and the material of the valve core is stainless steel or plastic.

11. The normally open one-way valve according to claim 1, characterized in that: An elastic member is arranged between the valve cover and the valve core, and the elastic member always has a tendency to move the valve core to the first state.

12. A shutdown pressure relief system, characterized in that: include: Pump, used to drive the working medium; A liquid outlet pipe connected to an outlet of the pump; The normally open one-way valve according to any one of claims 1 to 11 is connected to the wall of the liquid outlet pipe, and the fluid channel is connected to the liquid outlet pipe.

13. A cleaning robot, characterized in that: include: A medium box, used for storing working medium; The shutdown pressure relief system as described in claim 12, wherein the pump is used to drive the working medium in the medium box through the liquid outlet pipe to the medium-using component.

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