Check quadruple valve and working method thereof

Abstract

The invention belongs to the technical field of engineering elements, and particularly relates to a valve, in particular to a check quadruple valve and a working method thereof.According to the check quadruple valve, when a check ring makes contact with the face, close to a liquid inlet flow channel, of a check cavity, the communicating position of the check cavity and the liquid inlet flow channel is surrounded, and when liquid in the liquid inlet flow channel flows to the check cavity, the liquid in the liquid inlet flow channel flows to the check cavity; the check valve plate is extruded to slide in the check ring, so that when liquid in the liquid inlet flow channel in the liquid inlet stops conveying and a water hammer effect is generated, the water hammer effect is prevented from directly impacting and acting on the check ring, and the effect of the check mechanism is ensured.

Description

Technical Field

[0001] This invention belongs to the field of engineering components technology, specifically relating to valves, and more particularly to a four-way check valve and its working method. Background Technology

[0002] The valve is equipped with a check mechanism to prevent liquid backflow. When the valve is closed, a water hammer effect occurs, which impacts the check mechanism. Prolonged impact can affect the tight contact between the check mechanism and the valve, leading to leakage and resulting in poor or even failed check function.

[0003] Therefore, to address the technical problem of poor backflow prevention or even failure of the backflow prevention mechanism due to the impact of water hammer on it, it is necessary to design a four-way backflow prevention valve and its working method.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one four-way check valve and its operating method.

[0006] In a first aspect, embodiments of this disclosure provide a check valve in four stages, comprising: A valve seat, wherein a plurality of liquid inlets are provided on the valve seat, and a check mechanism is provided in the liquid inlets; The check mechanism includes: a check ring and a check valve plate; The inlet is provided with a check chamber and an inlet channel, and the inlet channel is connected to the check chamber. The check ring is disposed in the check cavity and is sleeved on the check valve plate; The check valve plate and the check ring are slidably connected, and the outer wall of the check valve plate is in close contact with the inner wall of the check ring; When the check ring contacts the side of the check cavity near the inlet flow channel, it surrounds the connection between the check cavity and the inlet flow channel. A limit ring is provided on the inner wall of the check ring away from the liquid inlet channel, and the limit ring is connected to the check valve plate by a first spring. When the liquid in the inlet channel flows into the check chamber, it squeezes the check valve plate, causing the check valve plate to slide within the check ring.

[0007] In one optional embodiment, the check valve mechanism further includes: a first filter plate and a second filter plate; The outer wall of the second filter plate is in contact with the inner wall of the check cavity; The first filter plate is disposed between the second filter plate and the check valve plate; A guide ring is provided on the side of the second filter plate near the liquid inlet channel, and the outer wall of the guide ring is in contact with the inner wall of the check cavity; The outer wall of the first filter plate contacts the inner wall of the guide ring, and the first filter plate and the guide ring are slidably connected. The second filter plate is provided with a guide post on one side near the liquid inlet channel. The guide post passes through the first filter plate and is covered with a guide sleeve. The guide sleeve is connected to the first filter plate and the check valve plate, and the check valve plate is connected to the outer wall of the guide sleeve. The second filter plate is connected to the side of the check chamber away from the inlet flow channel by a second spring.

[0008] In one alternative embodiment, the inner wall of the guide ring is inclined and becomes thicker as it moves further away from the liquid inlet channel; The bottom of the check chamber is provided with a drain port, and a baffle is hinged to the drain port; As the first filter plate moves closer to the second filter plate, the first filter plate gradually presses against the guide ring, causing the guide ring to press against and squeeze the hinged position between the baffle and the drain outlet.

[0009] In one optional embodiment, when liquid continuously flows from the inlet channel to the check chamber, the liquid squeezes the check valve plate, causing it to approach the limiting ring. When the check valve plate can no longer move, it drives the check ring to disengage from the inner wall of the check chamber, opening the connection between the check chamber and the inlet channel. After entering the check chamber, the liquid is filtered by the first filter plate and the second filter plate.

[0010] In one optional embodiment, the valve seat has an inlet chamber corresponding to the inlet port, and the inlet chamber is connected to the corresponding check chamber through a first flow channel. After being filtered, the liquid enters the corresponding inlet chamber.

[0011] In one optional embodiment, the valve seat is provided with an opening mechanism corresponding to the liquid inlet, the opening mechanism being adapted to open or close the communication position between the first flow channel and the liquid inlet chamber; The opening mechanism includes: a valve stem and a valve core; The valve stem passes through a limiting hole opened inside the valve seat; The bottom end of the valve stem is connected to the valve core; The valve core is located inside the liquid inlet chamber and above the position where the first flow channel connects to the liquid inlet chamber.

[0012] In one alternative embodiment, a diaphragm is connected to the valve stem, and the diaphragm covers the opening on the top surface of the corresponding inlet chamber; The valve stem is provided with a ring body, which contacts the inner wall of the cavity opened in the valve seat to divide the cavity into an upper cavity and a lower cavity; The valve stem is fitted with a third spring, which is located in the upper chamber. The valve seat is provided with an air port, which is connected to the lower chamber.

[0013] In one optional embodiment, adjacent inlet chambers within the valve seat are connected via a second flow channel; The valve seat is provided with a liquid outlet, which is connected to one of the liquid inlet chambers.

[0014] In one optional embodiment, a photoelectric sensor electrically connected to the control module is provided inside the valve seat; The photoelectric sensor corresponds to the valve core and is positioned above the corresponding limiting hole; The tip of the valve stem is adapted to extend into the photoelectric sensor when it moves upward.

[0015] Secondly, this disclosure also provides a method for operating the above-described check valve quadruple valve, comprising: When the liquid in the inlet channel flows into the check chamber, it squeezes the check valve plate, causing the check valve plate to slide within the check ring.

[0016] The beneficial effect of this invention is that, when the check ring contacts the side of the check chamber near the inlet flow channel, it surrounds the connection between the check chamber and the inlet flow channel. When the liquid in the inlet flow channel flows into the check chamber, it squeezes the check valve plate, causing the check valve plate to slide within the check ring. This prevents the water hammer effect from directly impacting the check ring when the liquid in the inlet flow channel stops flowing and water hammer effect occurs, thus ensuring the effectiveness of the check mechanism.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a check valve quadruple valve provided in an embodiment of the present disclosure; Figure 2 A cross-sectional view of a check valve mechanism provided in an embodiment of this disclosure; Figure 3 This is a cross-sectional view of an opening mechanism provided in an embodiment of this disclosure.

[0021] In the picture: 1 Valve seat, 11 Liquid inlet chamber, 12 First flow channel, 13 Limiting hole, 14 Air port, 15 Second flow channel; 2. Liquid inlet, 21. Check chamber, 22. Liquid inlet channel, 23. Drain outlet, 24. Baffle; 3 Check mechanism, 31 Check ring, 311 Limiting ring, 312 First spring, 32 Check valve plate, 33 First filter plate, 34 Second filter plate, 341 Guide ring, 342 Guide post, 343 Guide sleeve, 35 Second spring; 4. Opening mechanism, 41. Valve stem, 42. Valve core, 43. Diaphragm, 44. Ring body, 45. Upper chamber, 46. Lower chamber, 47. Third spring; 5 liquid outlet; 6. Photoelectric sensor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0024] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0025] The valve is equipped with a check mechanism to prevent liquid backflow. When the valve is closed, a water hammer effect occurs, which impacts the check mechanism. Prolonged impact can affect the tight contact between the check mechanism and the valve, leading to leakage and resulting in poor or even failed check function.

[0026] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] like Figure 1 and Figure 2As shown, at least one disclosed embodiment provides a four-way check valve, comprising: a valve seat 1, wherein the valve seat 1 is provided with a plurality of liquid inlets 2, and a check mechanism 3 is provided within each liquid inlet 2; the check mechanism 3 includes: a check ring 31 and a check valve plate 32; a check cavity 21 and a liquid inlet channel 22 are formed within each liquid inlet 2, and the liquid inlet channel 22 communicates with the check cavity 21; the check ring 31 is disposed within the check cavity 21 and is sleeved on the check valve plate 32; the check valve plate 32 is slidably connected to the check ring 31, and the outer wall of the check valve plate 32 is in close contact with the inner wall of the check ring 31; the... When the check ring 31 contacts the side of the check cavity 21 near the inlet channel 22, it surrounds the connection between the check cavity 21 and the inlet channel 22. A limit ring 311 is provided on the inner wall of the check ring 31 away from the inlet channel 22. The limit ring 311 is connected to the check valve plate 32 by a first spring 312. When the liquid in the inlet channel 22 flows into the check cavity 21, it squeezes the check valve plate 32, causing the check valve plate 32 to slide within the check ring 31. This prevents the water hammer effect from directly impacting the check ring 31 when the liquid in the inlet channel 22 stops flowing and generates a water hammer effect, thus ensuring the effectiveness of the check mechanism 3.

[0030] In this embodiment, the number of liquid inlets 2 can be four, and the number of liquid outlets 5 can be one.

[0031] In this embodiment, the check valve mechanism 3 can close the connection between the check valve chamber 21 and the inlet channel 22 when there is no continuous liquid entering the inlet 2, thereby preventing liquid backflow.

[0032] In this embodiment, by setting the check valve plate 32 to be slidable within the check ring 31, when the water hammer effect impacts the check valve plate 32, the check valve plate 32 can slide within the check ring 31, reducing the impact of the water hammer effect on the check valve plate 32, avoiding damage to the check valve plate 32 due to the water hammer effect, thereby preventing leakage of the check mechanism 3 and ensuring the check effect.

[0033] like Figure 2As shown, in an optional embodiment, the check valve mechanism 3 further includes: a first filter plate 33 and a second filter plate 34; the outer wall of the second filter plate 34 contacts the inner wall of the check cavity 21; the first filter plate 33 is disposed between the second filter plate 34 and the check valve plate 32; a guide ring 341 is provided on the side of the second filter plate 34 near the liquid inlet channel 22, and the outer wall of the guide ring 341 contacts the inner wall of the check cavity 21; the outer wall of the first filter plate 33 contacts the inner wall of the guide ring 341, and... Furthermore, the first filter plate 33 is slidably connected to the guide ring 341; a guide post 342 is provided on the side of the second filter plate 34 near the liquid inlet channel 22, the guide post 342 passes through the first filter plate 33, and a guide sleeve 343 is provided on the outer sleeve of the guide post 342; the guide sleeve 343 is connected to the first filter plate 33 and the check valve plate 32, and the check valve plate 32 is connected to the outer wall of the guide sleeve 343; the second filter plate 34 and the side of the check cavity 21 away from the liquid inlet channel 22 are connected by a second spring 35.

[0034] In this embodiment, the check valve plate 32 can be annularly sleeved on the outer wall of the guide sleeve 343, and the guide sleeve 343 and the guide post 342 are in close contact.

[0035] In this embodiment, the outer diameter of the check ring 31 is larger than the diameter at the connection point between the inlet channel 22 and the check cavity 21. The inner diameter of the check ring 31 can also be larger than the diameter at the connection point between the inlet channel 22 and the check cavity 21. This ensures that when no liquid enters the inlet channel 22, the check ring 31 is tightly attached to the inner wall of the check cavity 21 at the connection point between the inlet channel 22 and the check cavity 21, and the side wall of the check valve plate 32 is in close contact with the inner wall of the check ring 31, thus closing the connection point between the inlet channel 22 and the check cavity 21. In other words, the connection point between the inlet channel 22 and the check cavity 21 is closed by surrounding the connection point between the inlet channel 22 and the check cavity 21.

[0036] In this embodiment, the outer diameter of the check ring 31 is smaller than the inner wall of the check cavity 21, so that liquid can enter the check cavity 21 after the check ring 31 separates from the inner wall of the check cavity 21.

[0037] In this embodiment, when liquid begins to continuously enter the inlet channel 22, the liquid pushes the check valve plate 32 to move, compressing the first spring 312. As the check valve plate 32 moves, it drives the first filter plate 33 closer to the second filter plate 34 via the guide sleeve 343. When the first spring 312 can no longer be compressed, the first filter plate 33 can contact the second filter plate 34. At this time, the liquid continues to push the check valve plate 32, causing the check ring 31 to move, opening the connection between the inlet channel 22 and the check chamber 21. When the check ring 31 moves... The second filter plate 34 moves synchronously, compressing the second spring 35. After entering the check chamber 21, the liquid is filtered by the first filter plate 33 and the second filter plate 34 before entering the first flow channel 12. When the second spring 35 can no longer be compressed, the second filter plate 34 stops moving. When the liquid stops entering the inlet flow channel 22, the second spring 35 drives the second filter plate 34 to reset so that the check ring 31 is reset. The first spring 312 drives the check valve plate 32 to reset, closing the connection between the inlet flow channel 22 and the check chamber 21, thus realizing the check function.

[0038] In this embodiment, when the liquid in the inlet channel 22 no longer continuously enters, the liquid in the first channel 12 flows towards the inlet channel 22, which can backwash the impurities filtered on the first filter plate 33. The flushed impurities accumulate in the part between the first filter plate 33 and the check ring 31 in the check cavity 21 and are deposited at the bottom of the check cavity 21.

[0039] like Figure 2 As shown, in one optional embodiment, the inner wall of the guide ring 341 is inclined and becomes thicker as it moves away from the liquid inlet channel 22; a drain port 23 is provided at the bottom of the check cavity 21, and a baffle 24 is hinged to the drain port 23; when the first filter plate 33 moves closer to the second filter plate 34, the first filter plate 33 gradually squeezes the guide ring 341 so that the guide ring 341 is tightly attached to and squeezes the baffle 24 and the drain port 23 at the hinge position.

[0040] In this embodiment, the guide ring 341 can be made of a material with a certain degree of elasticity. As the first filter plate 33 moves closer to the second filter plate 34, the pressure of the first filter plate 33 on the guide ring 341 gradually increases due to the inclined inner wall of the guide ring 341. This causes the outer wall of the guide ring 341 to be tightly attached to the inner wall of the check cavity 21. As liquid continuously enters the liquid inlet channel 22, when the second filter plate 34 stops moving, a portion of the guide ring 341 contacts the inner wall of the check cavity 21, and a portion contacts the hinged position between the baffle 24 and the drain port 23. This prevents the baffle 24 from rotating downwards, ensuring that the baffle 24 closes the drain port 23 and prevents liquid in the check cavity 21 from leaking from the drain port 23.

[0041] In this embodiment, the baffle 24 can rotate away from the check cavity 21 around the hinge position, so that the drain port 23 opens, and impurities are discharged by opening the drain port 23 after the liquid stops entering.

[0042] In one alternative embodiment, when liquid continuously flows from the inlet channel 22 to the check chamber 21, the liquid squeezes the check valve plate 32 to bring it close to the limiting ring 311. When the check valve plate 32 can no longer move, it drives the check ring 31 to disengage from the inner wall of the check chamber 21, and the check chamber 21 and the inlet channel 22 are connected. After entering the check chamber 21, the liquid is filtered by the first filter plate 33 and the second filter plate 34.

[0043] like Figure 2 As shown, in one optional embodiment, the valve seat 1 has an inlet chamber 11 corresponding to the inlet port 2. The inlet chamber 11 is connected to the corresponding check chamber 21 through the first flow channel 12. After being filtered, the liquid enters the corresponding inlet chamber 11.

[0044] like Figure 3 As shown, in an optional embodiment, the valve seat 1 is provided with an opening mechanism 4 corresponding to the liquid inlet 2. The opening mechanism 4 is adapted to open or close the communication position between the first flow channel 12 and the liquid inlet chamber 11. The opening mechanism 4 includes a valve stem 41 and a valve core 42. The valve stem 41 passes through a limiting hole 13 opened in the valve seat 1. The bottom end of the valve stem 41 is connected to the valve core 42. The valve core 42 is located in the liquid inlet chamber 11 and is located above the communication position between the first flow channel 12 and the liquid inlet chamber 11.

[0045] like Figure 3 As shown, in one optional embodiment, a diaphragm 43 is connected to the valve stem 41, and the diaphragm 43 covers the opening on the top surface of the corresponding liquid inlet chamber 11; a ring 44 is provided on the valve stem 41, and the ring 44 contacts the inner wall of the cavity opened in the valve seat 1 to divide the cavity into an upper chamber 45 and a lower chamber 46; a third spring 47 is sleeved on the valve stem 41, and the third spring 47 is located in the upper chamber 45; an air port 14 is provided on the valve seat 1, and the air port 14 communicates with the lower chamber 46.

[0046] In this embodiment, the air port 14 can be connected to an air source. By passing air into the lower chamber 46 through the air source, the ring 44 moves upward, causing the valve stem 41 to move upward, which in turn causes the valve core 42 to move upward, opening the connection between the first flow channel 12 and the liquid inlet chamber 11.

[0047] like Figure 3 As shown, in one optional embodiment, adjacent liquid inlet chambers 11 in the valve seat 1 are connected by a second flow channel 15; the valve seat 1 is provided with a liquid outlet 5, which is connected to one of the liquid inlet chambers 11.

[0048] In this embodiment, the liquid in the inlet chamber 11 can flow to the outlet 5 through the second flow channel 15.

[0049] In one optional embodiment, a photoelectric sensor 6 electrically connected to the control module is provided inside the valve seat 1; the photoelectric sensor 6 corresponds to the valve core 42 and is disposed above the corresponding limiting hole 13; the top end of the valve stem 41 is adapted to extend into the photoelectric sensor 6 when it moves upward.

[0050] In this embodiment, the photoelectric sensor 6 can detect the upward position of the valve stem 41.

[0051] At least one other disclosed embodiment also provides a method of operating the above-described check valve quadruple valve, comprising: when liquid in the inlet channel 22 flows to the check chamber 21, squeezing the check valve plate 32 to cause the check valve plate 32 to slide within the check ring 31.

[0052] In summary, this four-way check valve, when the check ring 31 contacts the side of the check chamber 21 near the inlet channel 22, surrounds the connection between the check chamber 21 and the inlet channel 22. When the liquid in the inlet channel 22 flows into the check chamber 21, it squeezes the check valve plate 32, causing the check valve plate 32 to slide within the check ring 31. This prevents the water hammer effect from directly impacting the check ring 31 when the liquid in the inlet channel 22 stops flowing and water hammer effect occurs, thus ensuring the effectiveness of the check mechanism 3.

[0053] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0054] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0055] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0056] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0057] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A four-way check valve, characterized in that, include: Valve seat (1), the valve seat (1) is provided with a plurality of liquid inlets (2), and a check mechanism (3) is provided in the liquid inlet (2); The check mechanism (3) includes: a check ring (31) and a check valve plate (32); The inlet (2) is provided with a check cavity (21) and an inlet channel (22), and the inlet channel (22) is connected to the check cavity (21); The check ring (31) is disposed in the check cavity (21) and is sleeved on the check valve plate (32); The check valve plate (32) and the check ring (31) are slidably connected, and the outer wall of the check valve plate (32) is in close contact with the inner wall of the check ring (31); When the check ring (31) contacts the side of the check cavity (21) near the inlet channel (22), it surrounds the connection position of the check cavity (21) and the inlet channel (22); A limiting ring (311) is provided on the inner wall of the check ring (31) at a position away from the liquid inlet channel (22), and the limiting ring (311) is connected to the check valve plate (32) by a first spring (312); When the liquid in the inlet channel (22) flows to the check chamber (21), it squeezes the check valve plate (32) so that the check valve plate (32) slides in the check ring (31).

2. The check valve as described in claim 1, characterized in that, The check valve mechanism (3) further includes: a first filter plate (33) and a second filter plate (34); The outer wall of the second filter plate (34) is in contact with the inner wall of the check cavity (21); The first filter plate (33) is disposed between the second filter plate (34) and the check valve plate (32); The second filter plate (34) has a guide ring (341) on one side near the liquid inlet channel (22), and the outer wall of the guide ring (341) is in contact with the inner wall of the check cavity (21); The outer wall of the first filter plate (33) contacts the inner wall of the guide ring (341), and the first filter plate (33) and the guide ring (341) are slidably connected; The second filter plate (34) is provided with a guide post (342) on one side near the liquid inlet channel (22). The guide post (342) passes through the first filter plate (33), and the guide post (342) is covered with a guide sleeve (343). The guide sleeve (343) is connected to the first filter plate (33) and the check valve plate (32), and the check valve plate (32) is connected to the outer wall of the guide sleeve (343); The second filter plate (34) is connected to the side of the check cavity (21) away from the liquid inlet channel (22) by a second spring (35).

3. The check valve as described in claim 2, characterized in that, The inner wall of the guide ring (341) is inclined and becomes thicker the further away from the liquid inlet channel (22); The bottom of the check cavity (21) is provided with a drain port (23), and a baffle (24) is hinged to the drain port (23). As the first filter plate (33) moves closer to the second filter plate (34), the first filter plate (33) gradually presses the guide ring (341) so that the guide ring (341) presses against and squeezes the hinge position of the baffle (24) and the drain outlet (23).

4. The check valve as described in claim 3, characterized in that, When the liquid continues to flow from the inlet channel (22) to the check chamber (21), the liquid squeezes the check valve plate (32) and makes it close to the limit ring (311). When the check valve plate (32) can no longer move, it drives the check ring (31) to disengage from the inner wall of the check chamber (21). The check chamber (21) and the inlet channel (22) are connected and the liquid enters the check chamber (21) and is filtered by the first filter plate (33) and the second filter plate (34).

5. The check valve as described in claim 1, characterized in that, The valve seat (1) has an inlet chamber (11) corresponding to the inlet port (2). The inlet chamber (11) is connected to the corresponding check chamber (21) through the first flow channel (12). After being filtered, the liquid enters the corresponding inlet chamber (11).

6. The check valve as described in claim 5, characterized in that, The valve seat (1) is provided with an opening mechanism (4) corresponding to the liquid inlet (2). The opening mechanism (4) is adapted to open or close the communication position between the first flow channel (12) and the liquid inlet chamber (11). The opening mechanism (4) includes: valve stem (41) and valve core (42); The valve stem (41) passes through the limiting hole (13) opened in the valve seat (1); The bottom end of the valve stem (41) is connected to the valve core (42); The valve core (42) is located inside the liquid inlet chamber (11) and above the connection position between the first flow channel (12) and the liquid inlet chamber (11).

7. The check valve as described in claim 6, characterized in that, A diaphragm (43) is connected to the valve stem (41), and the diaphragm (43) covers the opening on the top surface of the corresponding liquid inlet chamber (11); A ring (44) is provided on the valve stem (41), and the ring (44) contacts the inner wall of the cavity opened in the valve seat (1) to divide the cavity into an upper cavity (45) and a lower cavity (46). The valve stem (41) is fitted with a third spring (47), which is located in the upper chamber (45); The valve seat (1) is provided with an air port (14), which is connected to the lower chamber (46).

8. The check valve as described in claim 7, characterized in that, The adjacent liquid inlet chambers (11) in the valve seat (1) are connected by a second flow channel (15); The valve seat (1) is provided with a liquid outlet (5), which is connected to one of the liquid inlet chambers (11).

9. The check valve as described in claim 8, characterized in that, The valve seat (1) is provided with a photoelectric sensor (6) that is electrically connected to the control module. The photoelectric sensor (6) corresponds to the valve core (42) and is positioned above the corresponding limiting hole (13); The top of the valve stem (41) is adapted to extend into the photoelectric sensor (6) when it moves upward.

10. A method for operating a check valve as described in claim 1, characterized in that, include: When the liquid in the inlet channel (22) flows to the check chamber (21), it squeezes the check valve plate (32) so that the check valve plate (32) slides in the check ring (31).

Images