Check valve

Abstract

The check valve is novel and reasonable in structure, it is ensured that the check valve has the basic automatic (active) opening and closing function of a valve element through a second regulation and control mechanism, the check valve is further provided with a first regulation and control mechanism, the first regulation and control mechanism is connected with the second regulation and control mechanism in a sliding and limiting mode, and the second regulation and control mechanism can be controlled; according to the check valve, passive opening of the valve element is achieved, so that under the condition of small water flow, the check valve can conduct fluid transmission control, and the problem that when the water pressure of an existing check valve is small, fluid cannot pass through is solved. According to the check valve, the first regulation and control mechanism can be flexibly started according to actual application working conditions, so that the check valve can be flexibly suitable for various working conditions such as large water flow and small water flow, the application working conditions of the check valve are expanded, and the practicability and the flexible regulation and control capacity of the check valve are enhanced. The top seat and the protection partition frame are adopted to provide fixed support for the first regulation and control mechanism and the second regulation and control mechanism, the protection partition frame is connected with the valve seat, and the overall stability of the valve body structure can be enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a novel check valve. Background Art

[0002] A check valve is a valve with a circular disc as the opening and closing part. It blocks the backflow of the medium by its own weight and the pressure of the medium. It is an automatic valve and is also called a non-return valve, a one-way valve, a reflux valve or an isolation valve. The disc movement mode is divided into lift type and swing type. The lift check valve is similar to the stop valve in structure, but lacks the valve stem that drives the disc.

[0003] Some check valves known to the inventor, such as the check valve disclosed in Chinese patent publication number CN107054327A, are configured with a spring between the cover member and the plunger to close the internal path. This valve structure is often suitable for paths with high water pressure. When the water pressure is low, it cannot overcome the elastic force of the spring, and the plunger cannot open the path, so that the water cannot pass through the valve body, which limits the application scenario of the check valve. Based on this, the present invention proposes a new type of check valve, which can easily adjust the valve opening to prevent the water from being unable to pass through the valve body when the water pressure is low. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of check valve, which can conveniently and actively adjust the valve opening to ensure that water can still flow through the valve body when the water pressure is low, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a check valve, comprising a regulating assembly, a valve seat assembly and a valve core, wherein:

[0006] The valve seat assembly comprises a valve seat, a valve cavity is arranged in the valve seat, a drain port and a water inlet are opened on the side wall of the valve seat, and the drain port and the water inlet are both connected to the valve cavity;

[0007] The valve core is movably installed in the valve cavity and is adapted to be arranged with the valve cavity;

[0008] The regulating component includes an outer shell frame, a first regulating mechanism and a second regulating mechanism. The outer shell frame is arranged on the valve seat, the first regulating mechanism is arranged on the outer shell frame, the first regulating mechanism is connected to the second regulating mechanism, the second regulating mechanism is connected to the valve core, the second regulating mechanism can make the valve core actively open under the impact of water flow and water pressure, so as to realize the drainage function of the valve seat, and the first regulating mechanism can apply external force to the second regulating mechanism when the valve core is not sufficient to be actively opened under the impact of water flow and water pressure, so as to make the valve core passively open.

[0009] In one embodiment, the first regulating mechanism is movably connected to the second regulating mechanism and can apply a lifting force to the second regulating mechanism so that the valve core is passively opened; the second regulating mechanism includes a top cap and a combined guide block, the top cap is fixed to the valve seat or the outer shell frame, a through hole is provided in the center of the top cap, the combined guide block movably passes through the through hole, the bottom end of the combined guide block is connected to the valve core, and a regulating spring 2 is also arranged between the valve core and the top cap, the upper end of the regulating spring 2 abuts or is connected to the lower surface of the top cap, and the lower end of the regulating spring 2 abuts or is connected to the valve core.

[0010] In one embodiment, the first regulating mechanism includes a lifting drive assembly and a top seat block, a regulating spring 1, a telescopic guide rod, a matching guide block, a base rod and a connecting protection rod connected in sequence from top to bottom, the connecting protection rod is slidably matched with the upper end of the combined guide block, the lifting drive assembly and the top seat block are both fixed to the outer shell frame, the lifting drive assembly is connected to the matching guide block, and is used to drive the matching guide block to rise and fall relative to the outer shell frame, and drive the combined guide block to rise and fall, so that the valve core is passively opened.

[0011] In one embodiment, the lifting drive assembly includes a hydraulic telescopic seat, a telescopic control rod, a connecting end frame and a side guard connecting plate, the hydraulic telescopic seat is fixed to the outer shell frame, the upper end of the telescopic control rod is connected to the hydraulic telescopic seat, the side guard connecting plate is located on one side of the telescopic control rod and is parallel to the telescopic control rod, the lower end of the telescopic control rod is fixed to the side guard connecting plate through the connecting end frame, and the side guard connecting plate is connected to the mating guide block through a connecting rod mechanism.

[0012] In one embodiment, the lifting drive components are provided in two groups and are symmetrically distributed on both sides of the matching guide block.

[0013] In one embodiment, the connecting rod mechanism includes a first hinge, a second hinge, a third hinge, a fourth hinge and a connecting hinge, wherein the fourth hinge and the second hinge are respectively fixed to the top and the bottom of the side guard connecting plate, the fourth hinge and the second hinge are arranged in parallel, and the first ends of the fourth hinge and the second hinge are connected to the first hinge through a group of the third hinge, wherein one end of the third hinge and one end of the first hinge are both hinged to the connecting hinge, the other end of the third hinge is hinged to the first end of the fourth hinge, and the other end of the first hinge is hinged to the first end of the second hinge; the second ends of the fourth hinge and the second hinge are connected to the first hinge through another group of the third hinge, wherein one end of the third hinge and one end of the first hinge are both hinged to another connecting hinge, the other end of the third hinge is hinged to the second end of the fourth hinge, and the other end of the first hinge is hinged to the second end of the second hinge; the two connecting hinges are respectively connected to the matching guide block through a side support rod.

[0014] In one embodiment, an axial hole is opened at the bottom end of the connecting protection rod, and the upper end of the combined guide block is slidably assembled in the axial hole, and a limiting plate is provided at the upper end of the combined guide block, and the bottom end of the axial hole is reduced in diameter to form a limiting ring at the bottom end of the connecting protection rod that cooperates with the limiting plate.

[0015] In one embodiment, the outer shell frame includes a protective partition frame and a top seat arranged on the top of the protective partition frame, the lower end of the protective partition frame is connected to the valve seat, the first regulating mechanism and the second regulating mechanism are both located in the cavity of the protective partition frame, and the first regulating mechanism is connected to the top seat.

[0016] In one embodiment, the check valve further includes a sound insulation protective sleeve, which is sleeved on the outside of the valve seat.

[0017] In one embodiment, the drain port and the water inlet are connected to a drain pipe and a water inlet pipe respectively.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The check valve proposed in the present invention has a novel and reasonable structure. It ensures that it has the basic automatic (active) opening and closing function of the valve core through the second regulating mechanism. It is also provided with a first regulating mechanism. The first regulating mechanism is connected with the second regulating mechanism by sliding limit, and can realize the passive opening of the valve core by controlling the second regulating mechanism, so that the check valve can also control the transmission of fluid under the condition of small water flow, and solves the problem that the current check valve cannot pass the fluid when the water pressure is low. The check valve can flexibly start the first regulating mechanism according to the actual application conditions, so that the check valve can be flexibly applied to a variety of conditions such as large water flow and small water flow, expand the application conditions of the check valve, and enhance the practicality and flexible regulation ability of the check valve.

[0020] In some technical solutions of the present invention, a top seat and a protective spacer are used to provide fixed support for the first regulating mechanism and the second regulating mechanism. The protective spacer is connected to the valve seat, which can enhance the overall stability of the valve body structure. The first regulating mechanism and the second regulating mechanism are built into the protective spacer, and the first regulating mechanism and the second regulating mechanism can be effectively protected by the protective spacer, thereby extending the service life and durability of the check valve.

[0021] In some technical solutions of the present invention, by arranging a sound insulation protective cover on the outside of the valve seat, the sound insulation protective cover can be used to isolate the water flow noise in the valve seat, so that the check valve is basically noiseless during operation, which is conducive to optimizing the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is an overall schematic diagram of the check valve disclosed in the embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the side three-dimensional structure of the check valve disclosed in an embodiment of the present invention.

[0025] Figure 3 This is a disassembled diagram of the check valve disclosed in an embodiment of the present invention.

[0026] Figure 4 This is a disassembled diagram of the regulating component in the check valve disclosed in the embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the assembly of the valve core and the regulating component in the check valve disclosed in the embodiment of the present invention.

[0028] Figure 6 It is a three-dimensional structural diagram of the first regulating mechanism in the check valve disclosed in an embodiment of the present invention.

[0029] Figure 7 It is a three-dimensional structural diagram of the second regulating mechanism in the check valve disclosed in the embodiment of the present invention.

[0030] Figure 8 It is a three-dimensional structural diagram of a check valve disclosed in an embodiment of the present invention with a sound insulation protective sleeve sleeved outside.

[0031] In the figure, the reference numerals are: 100, check valve; 1, regulating assembly; 2, valve seat assembly; 3, drain pipe; 4, valve seat; 41, valve chamber; 5, water inlet pipe; 6, top seat; 7, protective partition; 8, valve core; 9, first regulating mechanism; 10, second regulating mechanism; 11, top seat block; 12, regulating spring one; 13, telescopic guide rod; 14, matching guide block; 15, base rod; 16, connecting protection rod; 17, side support rod; 18, connecting hinge plate; 19, first hinge; 20, second hinge; 21, connecting end frame; 22, side protection connecting plate; 23, third hinge; 24, fourth hinge; 25, telescopic regulating rod; 26, hydraulic telescopic seat; 27, top cap; 28, combined guide block; 29, regulating spring two; 30, limit plate; 31, sound insulation protective cover. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a new type of check valve, which can conveniently perform active regulation of the valve opening to ensure that water can still pass through the valve body when the water pressure is low, so as to solve the problem that the existing check valve cannot open normally when the water pressure is low, thereby preventing water from passing through the valve body.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 1 to Figure 7As shown, this embodiment provides a new type of check valve 100, which mainly includes a regulating component 1, a valve seat component 2 and a valve core 8. The regulating component 1 is arranged at the upper end of the valve seat component 2. The valve seat component 2 includes a valve seat 4. A valve cavity 41 is arranged in the valve seat 4. A drain port and a water inlet are opened on the side wall of the valve seat 4, and the drain port and the water inlet are both connected to the valve cavity 41; the valve core 8 is adaptively arranged with the valve cavity 41, and the structural arrangement of the valve seat component 2 can realize the drainage function of the check valve 100. Water enters through the water inlet, and then the regulating component 1 regulates the matching position relationship between the valve core 8 and the valve cavity 41 in the valve seat 4 to perform drainage control, and finally outputs through the drain port to form a check valve structure. Among them, the regulating component 1 includes an outer shell frame, a first regulating mechanism 9 and a second regulating mechanism 10. The outer shell frame is arranged on the valve seat 4, the first regulating mechanism 9 is arranged on the outer shell frame, the first regulating mechanism 9 is connected to the second regulating mechanism 10, and the second regulating mechanism 10 is connected to the valve core 8. The first regulating mechanism 9 and the second regulating mechanism 10 can cooperate to perform two-stage lifting and lowering regulation of the valve core 8, so as to control the operation of the check valve 100, wherein the two-stage regulation is realized by the first regulating mechanism 9 and the second regulating mechanism 10 respectively, the second regulating mechanism 10 can make the valve core 8 actively open under the impact of water flow and water pressure, and the first regulating mechanism 9 mainly cooperates with the second regulating mechanism 10 to make the valve core 8 passively open when the valve core 8 is not sufficiently opened by the impact of water flow and water pressure, so that when the water pressure is low, the water flow can still pass through the check valve 100.

[0037] In one embodiment, if Figure 3 to Figure 7 As shown, the first regulating mechanism 9 includes a top seat block 11, a regulating spring 12, a telescopic guide rod 13, a matching guide block 14, a base rod 15, a connecting protection rod 16 and a lifting drive assembly. The top seat block 11 is fixed to the outer shell frame, and the lower end of the top seat block 11 is connected to the telescopic guide rod 13 through a regulating spring 12. The lower end of the telescopic guide rod 13 is fixedly connected to the matching guide block 14, and the lower end of the matching guide block 14 is fixedly connected to the base rod 15, and the lower end of the base rod 15 is fixedly connected to the connecting protection rod 16; the lifting drive assembly includes a hydraulic telescopic seat 26, a telescopic regulating rod 25, a connecting end frame 21 and a side guard connecting plate 22. The hydraulic telescopic seat 26 is fixed to the outer shell frame, and the upper end of the telescopic regulating rod 25 is connected to the hydraulic telescopic seat 26. The side guard connecting plate 22 is located on one side of the telescopic regulating rod 25 and is parallel to the telescopic regulating rod 25. The lower end of the telescopic regulating rod 25 is fixed to the side guard connecting plate 22 through the connecting end frame 21; the lifting drive assembly is arranged in two groups and is symmetrically distributed on both sides of the matching guide block 14, as shown in FIG. Figure 6As shown, the side guard connecting plates 22 of the two sets of lifting drive components are arranged relative to each other. When the water flow pressure in the valve chamber 41 is relatively low, the second regulating mechanism 10 at this time cannot open the valve core 8, and intervention regulation needs to be performed through the first regulating mechanism 9. At this time, the hydraulic telescopic seat 26 performs telescopic operation, driving the telescopic regulating rod 25 and the connecting end frame 21 to move. The side end of the connecting end frame 21 is connected to the side guard connecting plate 22, which can drive the side guard connecting plate 22 to move synchronously, and the top and bottom of the side guard connecting plate 22 are respectively fixedly connected with the fourth hinge 24 and the second hinge 20, and the fourth hinge 24 and the second hinge 20 are arranged in parallel up and down, and the fourth hinge 24 and the first hinge 20 are arranged in parallel up and down. The two ends of the two hinges 20 are connected by a connecting rod group, which includes a third hinge 23 and a first hinge 19. One end of the third hinge 23 and one end of the first hinge 19 are both hinged to the connecting hinge 18, and the other end of the third hinge 23 is hinged to one end of the fourth hinge 24, and the other end of the first hinge 19 is hinged to one end of the second hinge 20; another group of connecting rod groups is symmetrically connected between the fourth hinge 24 and the other end of the second hinge 20, and the ends of the third hinge 23 and the first hinge 19 of the other group of connecting rod groups are both hinged to another connecting hinge 18, such as Figure 6 As shown, the fourth hinge 24 and the second hinge 20, the two sets of the third hinge 23 and the first hinge 19 are hinged end to end to form a six-link mechanism with a honeycomb structure (hexagonal), and the front and rear ends of the six-link mechanism are both provided with connecting hinges 18, and the two connecting hinges 18 are respectively connected to the matching guide block 14 through a side support rod 17. Figure 5 and Figure 6 As shown, the lifting drive components on both sides of the matching guide block 14 are connected to the matching guide block 14 through the above-mentioned six-link mechanism. The two sets of lifting drive components generally work synchronously, and the hydraulic telescopic seat 26 changes the height of the side guard plate 22 and the connecting end frame 21 through the telescopic control rod 25. The side guard plate 22 is connected with the fourth hinge frame 24 and the second hinge frame 20, and the force is transmitted to the third hinge frame 23 and the first hinge frame 19, and finally acts on the four connecting hinge plates 18 at the four corners of the matching guide block 14. At this time, the connecting hinge plates 18 drive the matching guide block 14 and the top seat block 11 to slide relative to each other through the side support rod 17, and the control spring 12 is compressed. The base rod 15 and the connecting protection rod 16 move synchronously with the matching guide block 14, so as to achieve the purpose of adjusting the height of the connecting protection rod 16 relative to the valve seat 4.

[0038] Furthermore, if Figure 5 and Figure 7As shown, the second regulating mechanism 10 includes a top cap 27, a combined guide block 28 and a second regulating spring 29. The top cap 27 is fixed on the valve seat 4 or the outer shell frame. A through hole is provided in the center of the top cap 27. The combined guide block 28 is movably arranged in the through hole. The bottom end of the combined guide block 28 is connected to the valve core 8, and a second regulating spring 29 is also mounted on the outside of the combined guide block 28. The upper end of the second regulating spring 29 abuts or is connected (welded or otherwise) to the lower surface of the top cap 27, and the lower end of the second regulating spring 29 abuts or is connected (welded or otherwise) to the valve core 8. When no fluid flows through the valve seat 4, the valve core 8 contacts and cooperates with the valve cavity 41 under the elastic pushing action of the second regulating spring 29. At this time, the outer wall of the valve core 8 contacts and cooperates with the inner wall of the valve cavity 41 in a sealing manner, thereby closing the water inlet and the drain outlet, thereby maintaining the closed state of the check valve. The upper end of the combined guide block 28 is higher than the upper surface of the top cap 27, and a limit plate 30 is provided at the upper end of the combined guide block 28. The limit plate 30 is in the shape of a disc, and the combined guide block 28 is in the shape of a column. The limit plate 30 is coaxially arranged with the combined guide block 28, and the outer diameter of the limit plate 30 is larger than the outer diameter of the combined guide block 28. Correspondingly, the bottom end of the connecting protection rod 16 is provided with an axial hole coaxial therewith, and the upper end of the combined guide block 28 is slidably assembled in the axial hole, and the axial hole has a certain axial length, and the aperture of the entire axial hole is clearance-matched with the limit plate 30. On the bottom end surface of the connecting protection rod 16, the above-mentioned axial hole is reduced in diameter so that the aperture of the axial hole located at the bottom end surface of the connecting protection rod 16 is smaller than the outer diameter of the limit plate 30, which can prevent the upper end of the combined guide block 28 from slipping off the bottom end surface of the connecting protection rod 16.

[0039] The water pressure in the valve chamber 41 is sufficient to overcome the elastic force of the second regulating spring 29 and to push the valve core 8. When the valve is opened, the first regulating mechanism 9 can remain stationary without being started. However, the pushing movement of the valve core 8 will drive the combined guide block 28 and its upper limit plate 30 to move synchronously. Therefore, the limit plate 30 will slide relative to the connecting protection rod 16. The axial length of the shaft hole in the connecting protection rod 16 is long enough and will not hinder the normal opening of the valve core 8 at this time. When the water pressure in the valve chamber 41 is not enough to overcome the elastic force of the regulating spring 29, and the valve core 8 cannot be opened by relying on the second regulating mechanism 10 alone, it is necessary to intervene and adjust through the first regulating mechanism 9. At this time, the hydraulic telescopic seat 26 performs telescopic operation, driving the telescopic regulating rod 25 and the connecting end frame 21 to move. The side end of the connecting end frame 21 is connected to the side guard connecting plate 22, which can drive the side guard connecting plate 22 to move synchronously. The side guard connecting plate 22 transmits the force to the third hinge frame 23 and the first hinge frame 19, and finally acts on the connecting hinge plate 18. The connecting hinge plate 18 drives the matching guide block 14 to slide toward the top seat block 11 through the side support rod 17, and the regulating spring 12 is compressed. The base rod 15 and the connecting protection rod 16 move synchronously with the matching guide block 14. In the initial moving state, the connecting protection rod 16 is in a sliding matching relationship with the upper end of the combined guide block 28, and the combined guide block 28 remains stationary at this time; after the connecting protection rod 16 continues to move to a certain height with the matching guide block 14, the bottom end face of the connecting protection rod 16 contacts the limit plate 30, and then the contact limiting effect of the bottom end face of the connecting protection rod 16 and the limit plate 30 is utilized, and the connecting protection rod 16 pulls the combined guide block 28 to move upward synchronously through the limit plate 30, thereby driving the valve core 8 to move upward, realizing the connection function between the water inlet and the drain outlet, and the check valve is opened to carry out the water flow guidance and drainage processing work.

[0040] As can be seen from the above, the second regulating mechanism 10 is used to ensure the automatic (active) opening and closing function of the check valve 100, which is suitable for large flow fluid (i.e., large fluid pressure). The water flow generates pressure, which can squeeze the valve core 8, so that the valve core 8 moves relative to the top cap 27, and the check valve 100 controls the transmission of the fluid; the first regulating mechanism 9 is mainly used to realize the passive opening and closing function of the check valve 100. The first regulating mechanism 9 is connected with the second regulating mechanism 10 by sliding limit, and can realize the passive opening of the valve core 8 by controlling the second regulating mechanism 10, so that the check valve 100 can also control the transmission of the fluid under the condition of small water flow. It should be noted that when only the second regulating mechanism 10 is started, the axial length of the inner shaft hole of the connecting protection rod 16 is sufficient, and the combined guide block 28 connected to the valve core 8 only slides relative to the connecting protection rod 16, and does not play a lifting function on the base rod 15 and the connecting protection rod 16.

[0041] In one embodiment, if Figure 3 and Figure 4As shown, the aforementioned outer shell frame specifically includes a hollow columnar protective spacer 7 and a top seat 6 arranged on the top of the protective spacer 7. The aforementioned first regulating mechanism 9 and second regulating mechanism 10 are both located in the cavity of the protective spacer 7. The top seat 6 and the protective spacer 7 play a fixing function. The first regulating mechanism 9 and the second regulating mechanism 10 are respectively located in the upper and middle parts of the protective spacer 7. The valve core 8 is arranged near the lower part of the protective spacer 7. Specifically: the lower end of the protective spacer 7 is connected to the valve seat 4, the top seat block 11 is fixed to the top seat 6, and the hydraulic telescopic seat 26 is fixedly connected to the inner wall of the protective spacer 7. The top cap 27 is fixedly connected to the upper end of the valve seat 4.

[0042] When in use, the water inlet and the drain outlet of the valve seat 4 are connected to the pipeline through the water inlet pipe 5 and the drain pipe 3 respectively. Water flows into the valve cavity 41 of the valve seat 4 through the water inlet pipe 5, squeezing the valve core 8. At this time, the valve core 8 moves toward the top cap 27 and drives the combined guide block 28 to move together. At this time, the compression regulating spring 29 is compressed, and the valve core 8 opens the blocked passage in the valve seat 4, thereby realizing the communication and drainage function of the valve seat 4. After the water flow pressure decreases or disappears, the valve core 8 can be pressed back into the valve seat 4 under the reset action of the regulating spring 29, realizing the closing function of the valve seat 4.

[0043] When the water flow pressure is relatively low, the second regulating mechanism 10 cannot open the valve core 8, and the hydraulic telescopic seat 26 works. The hydraulic telescopic seat 26 is a hydraulic cylinder, which drives the telescopic regulating rod 25 and the connecting end frame 21 to move. The side end of the connecting end frame 21 is connected to the side guard connecting plate 22, which can drive the side guard connecting plate 22 to move synchronously, and the side end of the side guard connecting plate 22 is fixedly connected to the fourth hinge 24 and the second hinge 20, and then transmits the force to the third hinge 23 and the first hinge 19, and finally acts on the connecting hinge plate 18. At this time, the connecting hinge plate 18 drives the matching guide block 14 to move through the side support rod 17, and the matching guide block 14 can drive the telescopic guide rod 13 to slide toward the top seat block 11. At this time, the base rod 15 and the connecting protection rod 16 follow the movement. In the initial stage, the connection protection rod 16 does not contact the limit plate 30 at the upper end of the combined guide block 28. After the connection protection rod 16 moves to a suitable height, the connection protection rod 16 contacts and limits the limit plate 30, which can pull the combined guide block 28 to move synchronously. The combined guide block 28 then drives the valve core 8 to move, thereby realizing the connection and drainage function of the valve seat 4.

[0044] It can be seen that the check valve 100 proposed by the present invention has a novel and reasonable structure. It ensures that it has the basic automatic (active) opening and closing function of the valve core through the second regulating mechanism. It is also provided with a first regulating mechanism. The first regulating mechanism is connected with the second regulating mechanism by sliding limit, and can realize the passive opening of the valve core by controlling the second regulating mechanism, so that the check valve can also control the transmission of fluid under small water flow conditions, solving the problem that the current check valve cannot pass the fluid when the water pressure is low. The check valve can flexibly start the first regulating mechanism according to the actual application conditions, so that the check valve can be flexibly applied to a variety of conditions such as large water flow and small water flow, expand the application conditions of the check valve, and enhance the practicality and flexible regulation ability of the check valve.

[0045] In some technical solutions of the present invention, a top seat and a protective spacer are used to provide fixed support for the first regulating mechanism and the second regulating mechanism. The protective spacer is connected to the valve seat, which can enhance the overall stability of the valve body structure. The first regulating mechanism and the second regulating mechanism are built into the protective spacer, and the first regulating mechanism and the second regulating mechanism can be effectively protected by the protective spacer, thereby extending the service life and durability of the check valve.

[0046] Example 2

[0047] On the basis of Example 1, Figure 8 As shown, in this embodiment, a sound insulation protective cover 31 is further provided on the outside of the valve seat 4, and the sound insulation protective cover 31 plays a sound insulation function.

[0048] When in use, the sound insulation protective cover 31 can isolate the water flow noise, so that the check valve 100 is basically noiseless during operation, which is conducive to optimizing the working environment.

[0049] Example 3

[0050] On the basis of Example 1, Figure 1 and Figure 2 As shown, the drain port and the water inlet of the valve seat 4 are respectively connected to the drain pipe 3 and the water inlet pipe 5, and the drain pipe 3 and the water inlet pipe 5 are used to be connected to the pipeline.

[0051] In one embodiment, if Figure 1 to Figure 3 As shown, one side of the valve seat 4 is connected to the drain pipe 3, and the side of the valve seat 4 facing away from the drain pipe 3 is connected to the water inlet pipe 5, and the drain pipe 3 and the water inlet pipe 5 are parallel.

[0052] In a preferred embodiment, the drain pipe 3 and the water inlet pipe 5 may be coaxially arranged, or may be staggered in the vertical direction of the valve seat 4 (ie, the height direction of the valve seat).

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A check valve, characterized in that: It comprises a regulating component (1), a valve seat component (2) and a valve core (8), wherein: The valve seat assembly (2) comprises a valve seat (4), a valve cavity (41) is arranged in the valve seat (4), a drain port and a water inlet are provided on the side wall of the valve seat (4), and the drain port and the water inlet are both in communication with the valve cavity (41); The valve core (8) is movably installed in the valve cavity (41) and is adapted to fit the valve cavity (41); The regulating component (1) comprises an outer housing frame, a first regulating mechanism (9) and a second regulating mechanism (10); the outer housing frame is arranged on the valve seat (4); the first regulating mechanism (9) is arranged on the outer housing frame; the first regulating mechanism (9) is connected to the second regulating mechanism (10); the second regulating mechanism (10) is connected to the valve core (8); the second regulating mechanism (10) can enable the valve core (8) to actively open under the impact of water flow and water pressure, thereby realizing the drainage function of the valve seat (4); and when the valve core (8) is insufficient to actively open under the impact of water flow and water pressure, the first regulating mechanism (9) can apply an external force to the second regulating mechanism (10) to enable the valve core (8) to passively open.

2. The check valve according to claim 1, characterized in that: The first regulating mechanism (9) is movably connected to the second regulating mechanism (10) and is capable of applying a lifting force to the second regulating mechanism (10) so that the valve core (8) is passively opened; the second regulating mechanism (10) comprises a top cap (27) and a combined guide block (28); the top cap (27) is fixed to the valve seat (4) or the outer shell frame; a through hole is provided at the center of the top cap (27); the combined guide block (28) movably passes through the through hole; the bottom end of the combined guide block (28) is connected to the valve core (8); a regulating spring (29) is further provided between the valve core (8) and the top cap (27); the upper end of the regulating spring (29) is in contact with or connected to the lower surface of the top cap (27); and the lower end of the regulating spring (29) is in contact with or connected to the valve core (8).

3. The check valve according to claim 2, characterized in that: The first regulating mechanism (9) comprises a lifting drive assembly and a top seat block (11), a regulating spring (12), a telescopic guide rod (13), a matching guide block (14), a base rod (15) and a connecting protection rod (16) which are connected in sequence from top to bottom. The connecting protection rod (16) is slidably matched with the upper end of the combined guide block (28). The lifting drive assembly and the top seat block (11) are both fixed to the outer housing frame. The lifting drive assembly is connected to the matching guide block (14) and is used to drive the matching guide block (14) to rise and fall relative to the outer housing frame and drive the combined guide block (28) to rise and fall, so that the valve core (8) is passively opened.

4. The check valve according to claim 3, characterized in that: The lifting drive assembly comprises a hydraulic telescopic seat (26), a telescopic regulating rod (25), a connecting end frame (21) and a side protection connecting plate (22); the hydraulic telescopic seat (26) is fixed to the outer shell frame; the upper end of the telescopic regulating rod (25) is connected to the hydraulic telescopic seat (26); the side protection connecting plate (22) is located on one side of the telescopic regulating rod (25) and is parallel to the telescopic regulating rod (25); the lower end of the telescopic regulating rod (25) is fixed to the side protection connecting plate (22) through the connecting end frame (21); and the side protection connecting plate (22) is connected to the matching guide block (14) through a connecting rod mechanism.

5. The check valve according to claim 4, characterized in that: The lifting drive components are arranged in two groups and are symmetrically distributed on both sides of the matching guide block (14).

6. The check valve according to claim 4, characterized in that: The connecting rod mechanism comprises a first hinge (19), a second hinge (20), a third hinge (23), a fourth hinge (24) and a connecting hinge (18), wherein the fourth hinge (24) and the second hinge (20) are respectively fixed to the top and the bottom of the side guard connecting plate (22), the fourth hinge (24) and the second hinge (20) are arranged in parallel, and the first ends of the fourth hinge (24) and the second hinge (20) are connected to the first hinge (19) through a group of the third hinge (23), wherein one end of the third hinge (23) and one end of the first hinge (19) are both hinged to the connecting hinge (18), and the other end of the third hinge (23) is connected to the fourth hinge (2 4), the other end of the first hinge (19) is hinged to the first end of the second hinge (20); the fourth hinge (24) and the second end of the second hinge (20) are connected to the first hinge (19) through another group of the third hinge (23), wherein one end of the third hinge (23) and one end of the first hinge (19) are hinged to another connecting hinge (18), the other end of the third hinge (23) is hinged to the second end of the fourth hinge (24), and the other end of the first hinge (19) is hinged to the second end of the second hinge (20); the two connecting hinges (18) are respectively connected to the matching guide block (14) through a side support rod (17).

7. The check valve according to any one of claims 3 to 6, characterized in that: An axial hole is formed at the bottom end of the connecting protection rod (16), and the upper end of the combined guide block (28) is slidably assembled in the axial hole. A limiting plate (30) is provided at the upper end of the combined guide block (28), and the bottom end of the axial hole is reduced in diameter to form a limiting ring at the bottom end of the connecting protection rod (16) that cooperates with the limiting plate (30) to limit the position.

8. The check valve according to any one of claims 1 to 6, characterized in that: The outer shell frame comprises a protective baffle (7) and a top seat (6) arranged on the top of the protective baffle (7), the lower end of the protective baffle (7) is connected to the valve seat (4), the first regulating mechanism (9) and the second regulating mechanism (10) are both located in the cavity of the protective baffle (7), and the first regulating mechanism (9) is connected to the top seat (6).

9. The check valve according to any one of claims 1 to 6, characterized in that: It also comprises a sound insulation protective sleeve (31), which is sleeved on the outside of the valve seat (4).

10. The check valve according to any one of claims 1 to 6, characterized in that: The drain port and the water inlet are respectively connected to a drain pipe (3) and a water inlet pipe (5).

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