Double one-way valve with novel structure

Abstract

The utility model provides a double one-way valve of novel structure relates to valve structure technical field, the double one-way valve includes valve body, separator and two spool subassembly, valve body includes valve cavity, water inlet and water outlet, separator is equipped with the water hole, separator is connected to valve cavity middle part and divides valve cavity into first mounting cavity and second mounting cavity, the valve cavity is equipped with the first mounting cavity and the second mounting cavity, the second mounting cavity is equipped with the second mounting cavity. The first mounting cavity communicates with the water inlet hole, the second mounting cavity communicates with the water outlet hole, the first mounting cavity communicates with the second mounting cavity through the water passing hole, and the two valve element assemblies are arranged in the first mounting cavity and the second mounting cavity correspondingly and can control connection and disconnection between the water inlet hole and the first mounting cavity and connection and disconnection between the water passing hole and the second mounting cavity correspondingly; each valve element assembly comprises a valve sleeve and a valve rod, and a through-flow structure used for being matched with the valve rod is arranged on the inner circumference of the valve sleeve. The contact area and friction force at the guide position of the valve rod can be reduced, the through-flow capacity is improved, impurity deposition is reduced, adhesion of the valve rod is reduced, and the valve is easier to open.

Description

Technical Field

[0001] The utility model relates to the technical field of valve structures, and particularly relates to a double check valve with a novel structure. Background Art

[0002] A turbid circulating water system is usually adopted in the high-pressure descaling pipeline of a steel mill. The double check valve is usually used in the low-pressure filling pipeline of the descaling water filling valve group. The main function of the low-pressure pre-filling pipeline is to fill the pipeline after the descaling valve. At the same time, when the descaling valve is opened, it can prevent the high-pressure descaling water from flushing back into the low-pressure pipeline, causing the pipeline to burst. The double check valve plays a dual protection role. However, since the turbid circulating water system is adopted in the descaling pipeline of the steel mill, a lot of impurities will accumulate at the valve core guide rod. If the low-pressure filling pipeline stops being used for a period of time, it will cause the valve rod guide to stick. Due to the low pressure of the low-pressure filling pipeline, the opening force provided is small, and the double check valve cannot be opened after being reused. Content of the Utility Model

[0003] To achieve the purpose of the utility model, the following technical solutions are adopted in the utility model:

[0004] According to one aspect of the utility model, a double check valve with a novel structure is provided, including:

[0005] A valve body, including a valve cavity and a water inlet hole and a water outlet hole communicating with the valve cavity;

[0006] A partition member, connected to the middle of the valve cavity, and dividing the valve cavity into a first installation cavity and a second installation cavity. The partition member is provided with a water passing hole. Among them, the first installation cavity communicates with the water inlet hole, the second installation cavity communicates with the water outlet hole, and the first installation cavity communicates with the second installation cavity through the water passing hole;

[0007] Two valve core components, respectively arranged inside the first installation cavity and the second installation cavity. Each valve core component includes a valve sleeve and a valve rod. The valve rod is arranged on the inner circumference of the valve sleeve and can move linearly along the axis of the valve sleeve. The inner circumference of the valve sleeve is provided with a flow-through structure adapted to the valve rod to reduce the friction with the valve rod;

[0008] Among them, the valve core component located in the first installation cavity can control the on-off between the water inlet hole and the first installation cavity; the valve core component located in the second installation cavity can control the on-off between the water passing hole and the second installation cavity.

[0009] According to an embodiment of the present utility model, two of the spool assemblies have the same structure and are arranged side by side along the water flow direction of the valve body. The water inlet end of the valve sleeve located in the first installation cavity is connected to the water outlet end of the water inlet hole. The water outlet end of the valve sleeve located in the first installation cavity abuts against the water inlet end of the water passing hole. The water inlet end of the valve sleeve located in the second installation cavity is connected to the water outlet end of the water passing hole. The water outlet end of the valve sleeve located in the second installation cavity is connected to the water inlet end of the water outlet hole.

[0010] According to an embodiment of the present utility model, the valve sleeve is provided with a guiding hole for guiding the valve rod, and a flow-through structure is provided on the inner circumference of the guiding hole. The flow-through structure includes a plurality of flow-through holes arranged along the axial direction of the guiding hole, and the plurality of flow-through holes are evenly distributed along the guiding hole.

[0011] According to an embodiment of the present utility model, the spool assembly further includes:

[0012] A valve seat, connected to the water inlet end of the valve sleeve;

[0013] A spool, sleeved inside the valve sleeve and capable of linearly moving along the valve sleeve. The spool corresponds to the valve seat to open or close the water inlet end of the valve sleeve. The valve rod is fixedly connected to the spool and extends towards the water outlet end of the valve sleeve;

[0014] An elastic member, one end connected to the end of the valve sleeve away from the valve seat, and the other end connected to the spool.

[0015] According to an embodiment of the present utility model, the valve sleeve is sequentially provided with a first stepped hole, a second stepped hole, a third stepped hole, a guiding hole, and a circular hole that are interconnected along the water flow direction. The valve seat is connected to the first stepped hole, and the circular hole is connected to the water passing hole or the water outlet hole;

[0016] Wherein, the third stepped hole includes a large-diameter section and a small-diameter section. One end of the elastic member is connected to the small-diameter section, and the other end of the elastic member is connected to the spool. One end of the spool is located in the large-diameter section, and the other end is inserted into the second stepped hole so that when the spool is at the maximum stroke, the spool abuts against the connection between the large-diameter section and the small-diameter section.

[0017] According to an embodiment of the present utility model, the inner circumference of the first stepped hole is threadedly connected to the outer circumference of the valve seat;

[0018] The second stepped hole includes a first hole section communicating with the first stepped hole and a second hole section for guiding the spool. Among them, the diameter of the second hole section is smaller than the diameter of the large-diameter section and larger than the diameter of the small-diameter section.

[0019] According to an embodiment of the present utility model, the inner circumference of the second hole section cooperates with the outer circumference of the valve core to guide the valve core; a spiral flow passage is provided on the inner circumference of the second hole section.

[0020] According to an embodiment of the present utility model, a first through hole is provided on one side of the second stepped hole close to the valve seat, a second through hole is provided on the hole wall of the large-diameter section, and a third through hole is provided on the hole wall of the round hole. The first through hole, the second through hole and the third through hole communicate the valve cavity and the inside of the valve sleeve respectively;

[0021] Among them, both the first through hole and the third through hole are inclined holes. The water flow direction of the first through hole is inclined from the inside of the valve sleeve towards the valve cavity and the water outlet hole, and the water flow direction of the third through hole is inclined from the valve cavity towards the valve sleeve and the water outlet hole.

[0022] According to an embodiment of the present utility model, the valve body is further connected with a safety valve assembly for regulating the pressure inside the valve body. The safety valve assembly includes a safety valve and a joint. The valve body is provided with an installation hole for installing the joint. The safety valve is connected to the installation hole through the joint. Among them, the separator is provided with a connection hole, and the connection hole communicates the water passage hole and the installation hole.

[0023] According to an embodiment of the present utility model, the valve body is further connected with a valve cover for limiting the position of the valve sleeve. One end of the valve cover abuts against the valve sleeve, and the other end of the valve cover is detachably connected to the valve body.

[0024] The present utility model has the following advantages or beneficial effects:

[0025] The present utility model can not only prevent high-pressure water from flowing back to the low-pressure pipeline, but also reduce the guiding contact area between the valve stem and the valve sleeve through the flow passage structure, reduce the friction force, increase the flow capacity at the same time, reduce the deposition of impurities, reduce the adhesion of the valve stem, and make the valve easier to open. Brief Description of the Drawings

[0026] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present utility model will become more apparent.

[0027] Figure 1 is a cross-sectional view of a novel double check valve according to an exemplary embodiment.

[0028] Figure 2 is a side view of the valve body according to an exemplary embodiment.

[0029] Figure 3 is a cross-sectional view of a valve body shown according to an exemplary embodiment.

[0030] Figure 4 is a cross-sectional view of a valve core assembly shown according to an exemplary embodiment.

[0031] Figure 5 is a side view of a valve sleeve shown according to an exemplary embodiment.

[0032] Figure 6 is a cross-sectional view of a valve sleeve shown according to an exemplary embodiment.

[0033] Figure 7 is Figure 6 an enlarged view of the part A in

[0034] Among them, the reference numerals are explained as follows:

[0035] 1. Valve body; 11. Valve cavity; 101. First installation cavity; 102. Second installation cavity; 11. Water inlet hole; 12. Water outlet hole; 13. Installation hole; 14. Bolt hole;

[0036] 2. Partition member; 21. Water passing hole; 22. Connecting hole;

[0037] 3. Valve core assembly; 31. Valve sleeve; 311. Flow-through structure; 3111. Flow-through hole; 312. Guide hole; 313. First stepped hole; 314. Second stepped hole; 3141. First hole section; 3142. Second hole section; 315. Third stepped hole; 3151. Large-diameter section; 3152. Small-diameter section; 316. Round hole; 317. First through hole; 318. Second through hole; 319. Third through hole; 32. Valve rod; 33. Valve seat; 34. Valve core; 35. Elastic member;

[0038] 4. Safety valve assembly; 41. Safety valve; 42. Connector;

[0039] 5. Valve cover; 6. Nozzle; 7. Flange. Detailed implementation manners

[0040] Now, the exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that this utility model will be complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0041] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and refer to the possibility of the existence of additional elements / components / etc. in addition to the listed elements / components / etc.

[0042] A double check valve with a novel structure according to an embodiment of the present utility model. The double check valve with the novel structure includes a valve body 1, a partition member 2, and two valve core assemblies 3. The partition member 2 is provided with a water passing hole 21. The valve body 1 includes a valve cavity 10, an inlet hole 11 and an outlet hole 12 communicating with the valve cavity 10. The partition member 2 is connected to the middle of the valve cavity 10 and divides the valve cavity 10 into a first installation cavity 101 and a second installation cavity 102. The first installation cavity 101 communicates with the inlet hole 11, and the second installation cavity 102 communicates with the outlet hole 12. The first installation cavity 101 communicates with the second installation cavity 102 through the water passing hole 21. The two valve core assemblies 3 are respectively arranged inside the first installation cavity 101 and the second installation cavity 102. Among them, the valve core assembly 3 located in the first installation cavity 101 can control the on-off between the inlet hole 11 and the first installation cavity 101; the valve core assembly 3 located in the second installation cavity 102 can control the on-off between the water passing hole 21 and the second installation cavity 102. Each valve core assembly 3 includes a valve sleeve 31 and a valve rod 32. The valve rod 32 is arranged on the inner circumference of the valve sleeve 31 and can perform linear motion along the axis of the valve sleeve 31. The inner circumference of the valve sleeve 31 is provided with a flow-through structure 311 adapted to the valve rod 32 to reduce the friction with the valve rod 32. In this application, connecting pipes 6 are connected to both the inlet hole 11 and the outlet hole 12 of the valve body 1. The connecting pipes 6 are connected between the flange 7 and the bolt holes 14 to fix the connecting pipes 6 on the valve body 1. Figure 1 The valve core assembly 3 located in the first installation cavity 101 on the left can open and close the first installation cavity 101. Figure 1 The valve core assembly 3 located in the second installation cavity 102 on the right opens or closes the water passing hole 21. The main functions of the two valve core assemblies 3 are to fill the pipeline after the descaling valve, and at the same time, when the descaling valve is opened, to prevent the high-pressure descaling water from flushing back into the low-pressure pipeline, causing the pipeline to burst, so that the double check valve plays a dual protection role. Through the flow-through structure 311, the guiding contact area between the valve rod 32 and the valve sleeve 31 can be reduced, the friction force can be reduced, at the same time, the flow-through capacity can be increased, the deposition of impurities can be reduced, the adhesion at the guiding part can be reduced, and the valve core 34 can be more easily opened.

[0043] In a preferred embodiment of the present utility model, as Figures 1-6The two spool valve assemblies 3 shown have the same structure and are arranged side by side along the water flow direction of the valve body 1. The water inlet end of the valve sleeve 31 located in the first installation cavity 101 is connected to the water outlet end of the water inlet hole 11, the water outlet end of the valve sleeve 31 located in the first installation cavity 101 abuts against the water inlet end of the water passing hole 21, the water inlet end of the valve sleeve 31 located in the second installation cavity 102 is connected to the water outlet end of the water passing hole 21, and the water outlet end of the valve sleeve 31 located in the second installation cavity 102 is connected to the water inlet end of the water outlet hole 12. This structure enables that when the water filling valve is opened and the descaling valve is closed, the low-pressure water enters the valve port of the spool valve assembly 3 located in the first installation cavity 101 from the water inlet hole 11, and uses the water pressure to push the valve rod 32 to move to the right and open the valve port and then enter the first installation cavity 101; then, the water flow enters the valve port of the spool valve assembly 3 located in the second installation cavity 102 from the water passing hole 21, and uses the water pressure to push the corresponding valve rod 32 to move to the right so that the water flow enters the second installation cavity 102 and then enters the water outlet hole 12, and finally flows out from the water outlet hole 12 of the double check valve. When the descaling valve is opened, the high-pressure water flows in from the water outlet hole 12, and the valve rod 32 on the right quickly rebounds under the action of the high-pressure water and presses tightly on its corresponding valve port to prevent the high-pressure water from flowing back from the water passing hole 21 to the low-pressure pipeline.

[0044] In a preferred embodiment of the present invention, as Figures 1-6 shown, the valve sleeve 31 is provided with a guiding hole 312 for guiding the valve rod 32. The inner circumference of the guiding hole 312 is provided with a flow-through structure 311. The flow-through structure 311 includes a plurality of flow-through holes 3111 arranged along the axial direction of the guiding hole 312, and the plurality of flow-through holes 3111 are evenly distributed along the guiding hole 312. The guiding hole 312 and the valve rod 32 are in clearance fit for guiding the valve rod 32. By providing a plurality of flow-through holes 3111, the guiding area between the guiding hole 312 and the valve rod 32 can be reduced, the friction force can be reduced, at the same time, the flow-through capacity can be increased, the deposition of impurities can be reduced, the adhesion at the guiding part can be reduced, and the spool 34 is easier to open.

[0045] In a preferred embodiment of the present invention, as Figures 1-6The spool assembly 3 shown also includes a valve seat 33, a spool 34, and an elastic member 35. The valve seat 33 is connected to the water inlet end of the valve sleeve 31. The spool 34 is sleeved inside the valve sleeve 31 and can move linearly along the valve sleeve 31. The spool 34 corresponds to the valve seat 33 to open or close the water inlet end of the valve sleeve 31. The valve stem 32 is fixedly connected to the spool 34 and extends towards the water outlet end of the valve sleeve 31. One end of the elastic member 35 is connected to the end of the valve sleeve 31 away from the valve seat 33, and the other end is connected to the spool 34. The valve seat 33 of the present application has a sleeve-shaped structure, its outer cylindrical surface is a stepped structure, and a valve seat valve port is machined on one side of its inner hole. The outer periphery of the spool 34 corresponds to the valve seat valve port. The spool 34 is concentric with the valve sleeve 31, and under the action of the spring force of the elastic member 35, the spool 34 is pressed against the valve seat valve port to close the water inlet end of the valve sleeve 31. Two threaded installation and disassembly holes are machined on the bottom surface of the other side of the valve seat. The stepped surface on the outer circle of the valve seat 33 near the valve port of the valve seat 33 is the valve seat positioning surface, which abuts against the left side surface of the first hole section 3141 to limit the position of the valve seat 33.

[0046] In a preferred embodiment of the present utility model, as Figures 1-6 The valve sleeve 31 shown is sequentially provided with a first stepped hole 313, a second stepped hole 314, a third stepped hole 315, a guide hole 312, and a round hole 316 that are interconnected along the water flow direction. The valve seat 33 is connected to the first stepped hole 313, and the round hole 316 is connected to the water passage hole 21 or the water outlet hole 12. Among them, the third stepped hole 315 includes a large-diameter section 3151 and a small-diameter section 3152. One end of the elastic member 35 is connected to the small-diameter section 3152, and the other end of the elastic member 35 is connected to the spool 34. One end of the spool 34 is located in the large-diameter section 3151, and the other end is inserted into the second stepped hole 314 so that when the spool 34 is at the maximum stroke, the spool 34 abuts against the connection between the large-diameter section 3151 and the small-diameter section 3152. The outer end of the valve seat 33 of the present application is connected to the first stepped hole 313, and the right side surface of the valve seat 33 abuts against the left side surface of the second stepped hole 314. The second stepped hole 314 can guide the spool 34. When the spool 34 is at the maximum stroke, the spool 34 abuts against the connection between the large-diameter section 3151 and the small-diameter section 3152 to limit the movement range of the spool 34.

[0047] In a preferred embodiment of the present utility model, as Figures 1-6The inner circumference of the first stepped hole 313 shown is threadedly connected to the outer circumference of the valve seat 33; the second stepped hole 314 includes a first hole section 3141 communicating with the first stepped hole 313 and a second hole section 3142 for guiding the valve core 34. Among them, the outer circle of the valve seat 33 near the valve port of the valve seat is machined with an external valve seat thread, so that the valve seat 33 and the valve sleeve 31 are fixed as a whole. The stepped surface on the outer circle of the valve seat 33 near the valve port of the valve seat is the valve seat positioning surface, which abuts against the left side surface of the first hole section 3141 to limit the position of the valve seat 33. In addition, the aperture of the second hole section 3142 is smaller than the aperture of the large aperture section 3151 and larger than the aperture of the small aperture section 3152. The inner circumference of the second hole section 3142 and the outer circumference of the valve core 34 are in clearance fit to guide the movement of the valve core 34. Among them, the structure that the aperture of the second hole section 3142 is smaller than the aperture of the large aperture section 3151 and larger than the aperture of the small aperture section 3152 is to ensure that the valve core 34 can be guided all the time, reduce the guiding area of the valve core 34, and when the valve core 34 moves to the maximum stroke, the valve core 34 abuts against the small aperture section 3152. The present application can not only achieve guiding and limiting, but also reduce friction, making it easier to open the valve core 34.

[0048] In a preferred embodiment of the present utility model, as Figure 1 、 4 、6 and 7 show that the inner circumference of the second hole section 3142 and the outer circumference of the valve core 34 cooperate to guide the valve core 34; a spiral flow-through groove 31421 is provided on the inner circumference of the second hole section 3142. Through the flow-through groove 31421, the contact area between the valve core 34 and the second hole section 3142 can be reduced, the friction force can be reduced, at the same time, the flow-through capacity can be increased, the deposition of impurities can be reduced, the adhesion at its guiding part can be reduced, and it is easier to open the valve core 34.

[0049] In a preferred embodiment of the present utility model, as Figures 1-6A first through hole 317 is formed on one side of the second stepped hole 314 shown, which is close to the valve seat 33. A second through hole 318 is formed on the hole wall of the large-diameter section 3151, and a third through hole 319 is formed on the hole wall of the round hole 316. The first through hole 317, the second through hole 318, and the third through hole 319 are respectively communicated with the valve cavity 10 and the inside of the valve sleeve 31. Among them, both the first through hole 317 and the third through hole 319 are inclined holes. The water flow direction of the first through hole 317 extends from the inside of the valve sleeve 31 towards the valve cavity 10 and the water outlet hole 12, and the water flow direction of the third through hole 319 extends from the valve cavity 10 towards the valve sleeve 31 and the water outlet hole 12. In this application, by making the water flow direction of the first through hole 317 inclined from the inside of the valve sleeve 31 towards the valve cavity 10 and the water outlet hole 12, the water flow can be guided to the water outlet end on the right side; the third through hole 319 can guide the water in the valve cavity 10 to the round hole 316 on the right side of the valve sleeve 31 and flow out of the inside of the valve sleeve 31. Among them, the axis of the second through hole 318 is perpendicular to the axis of the valve stem 32. This can prevent the water flow in the valve cavity 10 from generating an inclined acting force on the valve stem 32 when flowing into the small-diameter section 3152 through the second through hole 318, resulting in difficulty in opening or closing the valve core 34. When in a vertical state, the water flows into the small-diameter section 3152 through the second through hole 318 and then can flow into the round hole 316 through a plurality of flow holes 3111, which can effectively balance the pressures on the left and right sides at the valve stem 32 and the guide hole 312. When opening the valve, only the friction between the valve core 34 and the valve sleeve 31 needs to be overcome, making it easier to open the valve.

[0050] The specific process is as follows: The water flow enters the valve port of the valve seat 33 located in the first installation cavity 101 through the water inlet hole 11, and pushes the corresponding valve core 34 to move to the right, so that the water flow enters the valve sleeve 31. Then, the water flow flows out through the first through hole 317 into the first installation cavity 101. Then, the water flow in the valve cavity 12 enters the round hole 316 on the right side of the valve sleeve 31, and after passing through the water hole 21, it flows through the valve sleeve 31 in the second installation cavity 102, and then enters the second installation cavity 102 through the first through hole 317 on it. The water in the second installation cavity 102 enters the corresponding round hole 316 through the corresponding third through hole 319 and is discharged from the water outlet hole 12.

[0051] In a preferred embodiment of the present utility model, as Figures 1-6The shown valve body 1 is also connected with a safety valve assembly 4 for regulating the internal pressure of the valve body 1. The safety valve assembly 4 includes a safety valve 41 and a connector 42. The valve body 1 is provided with a mounting hole 13 for mounting the connector 42. The safety valve 41 is connected to the mounting hole 13 through the connector 42. Among them, the separator 2 is provided with a connection hole 22, and the connection hole 22 communicates with the water passage hole 21 and the mounting hole 13. The safety valve 41 is communicated with the water passage hole 21 through the mounting hole 13 and the connection hole 22. The set pressure of the safety valve 41 is higher than the pressure of the low-pressure filling connection pipeline. If the valve port of the water outlet hole 12 is damaged, the high-pressure water will rush back into the water passage hole 21, and the safety valve 41 will open and the medium will flow out to play a warning role.

[0052] In a preferred embodiment of the present utility model, as Figures 1-6 shown, the valve body 1 is also connected with a valve cover 5 for limiting the position of the valve sleeve 31. One end of the valve cover 5 abuts against the valve sleeve 31, and the other end of the valve cover 5 is detachably connected to the valve body 1. The valve cover 5 is of a stepped structure, and its inner hole is a through hole. The smaller-diameter side of the valve cover 5 extends into the valve cavity 10 and abuts against the outer end of the valve seat 33. The outer stepped surface of the valve cover 5 abuts against the end surface of the valve body 1 and is fixed by bolts, thereby realizing the limitation and fixation of the valve sleeve 31. In addition, the outer circumference of the connecting pipe 6 is of a stepped structure, and the flange 7 is of a circular plate structure, on which flange through holes corresponding to the bolt holes 14 are processed for fixing the flange 7. The center of the flange 7 is processed with a flange center hole for fixing the connecting pipe 6. The shape and size of the flange center hole match those of the connecting pipe 6. The connecting pipe 6 passes through the flange center hole and abuts against the outer end surface of the valve cover 5, and then the connecting pipe 6 is pressed and fixed on the valve body 1 through bolts and nuts.

[0053] Specific principle:

[0054] When the water filling valve is opened and the descaling valve is closed, the low-pressure water enters the valve port of the valve core assembly 3 located in the first installation cavity 101 from the water inlet hole 11, and uses the pressure of the water to push the valve rod 32 to move to the right. Its pressure causes the valve core 34 to overcome the spring force and move. The valve core 34 finally abuts against the connection part between the small-diameter section 3152 and the large-diameter section 3151, so that the pressure in the water inlet hole 11 enters the inside of the valve sleeve 31; then, the water flows out to the first installation cavity 101 through the first through hole 317; then, the water in the valve cavity 12 enters the round hole 316 on the right side of the valve sleeve 31, then flows to the valve sleeve 31 in the second installation cavity 102 through the water passage hole 21, and then enters the second installation cavity 102 through the first through hole 317 on it. The water in the second installation cavity 102 enters the corresponding round hole 316 through the corresponding third through hole 319 and is discharged from the water outlet hole 12.

[0055] When the descaling valve is opened, high-pressure water flows into the water outlet hole 12. The valve stem 32 on the right side rebounds rapidly under the action of the high-pressure water and makes the valve core 34 connected thereto press tightly on the corresponding valve seat 33, preventing the high-pressure water from flowing back from the water passing hole 21 to the low-pressure pipeline.

[0056] Since the safety valve 41 is communicated with the water passing hole 21 and its set pressure is higher than the pressure of the low-pressure charging pipeline, if the valve port on the valve core assembly 3 in the second installation cavity 102 is damaged, the high-pressure water will rush back into the water passing hole 21. At this time, the safety valve 41 will open and the medium will flow out, playing a warning role.

[0057] In the embodiments of the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0058] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the embodiments of the present invention.

[0059] In the description of this specification, the description of terms such as "one embodiment", "one preferred embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0060] The above are only the preferred embodiments of the embodiments of the present invention, and are not used to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A double check valve of a new structure, characterized in that: include: A valve body (1) comprising a valve cavity (10) and a water inlet hole (11) and a water outlet hole (12) communicating with the valve cavity (10); a separator (2) connected to the middle of the valve cavity (10) and dividing the valve cavity (10) into a first installation cavity (101) and a second installation cavity (102); the separator (2) is provided with a water passage hole (21), wherein the first installation cavity (101) is connected to the water inlet hole (11), the second installation cavity (102) is connected to the water outlet hole (12), and the first installation cavity (101) is connected to the second installation cavity (102) through the water passage hole (21); Two valve core assemblies (3) are respectively arranged inside the first installation cavity (101) and the second installation cavity (102), each of the valve core assemblies (3) comprises a valve sleeve (31) and a valve stem (32), the valve stem (32) is arranged on the inner periphery of the valve sleeve (31) and can move linearly along the axis of the valve sleeve (31), and the inner periphery of the valve sleeve (31) is provided with a flow-through structure (311) adapted to the valve stem (32) so as to reduce friction on the valve stem (32); The valve core assembly (3) located in the first installation cavity (101) can control the connection and disconnection between the water inlet hole (11) and the first installation cavity (101); the valve core assembly (3) located in the second installation cavity (102) can control the connection and disconnection between the water passage hole (21) and the second installation cavity (102); The valve sleeve (31) is provided with a guide hole (312) for guiding the valve stem (32); the flow structure (311) is provided on the inner periphery of the guide hole (312); the flow structure (311) includes a plurality of flow holes (3111) arranged along the axial direction of the guide hole (312); the plurality of flow holes (3111) are evenly distributed along the guide hole (312).

2. The double one-way valve of the novel structure according to claim 1 is characterized in that: The two valve core assemblies (3) have the same structure and are arranged in parallel along the water flow direction of the valve body (1); the water inlet end of the valve sleeve (31) located in the first installation cavity (101) is connected to the water outlet end of the water inlet hole (11); the water outlet end of the valve sleeve (31) located in the first installation cavity (101) abuts against the water inlet end of the water passage hole (21); the water inlet end of the valve sleeve (31) located in the second installation cavity (102) is connected to the water outlet end of the water passage hole (21); and the water outlet end of the valve sleeve (31) located in the second installation cavity (102) is connected to the water inlet end of the water outlet hole (12).

3. The double one-way valve of the novel structure according to claim 1 is characterized in that: The valve core assembly (3) further comprises: A valve seat (33) connected to the water inlet end of the valve sleeve (31); a valve core (34) which is sleeved inside the valve sleeve (31) and can move linearly along the valve sleeve (31); the valve core (34) corresponds to the valve seat (33) and is used to open or close the water inlet end of the valve sleeve (31); the valve stem (32) is fixedly connected to the valve core (34) and extends toward the water outlet end of the valve sleeve (31); An elastic member (35) has one end connected to an end of the valve sleeve (31) away from the valve seat (33), and the other end connected to the valve core (34).

4. The double one-way valve of the novel structure according to claim 3 is characterized in that: The valve sleeve (31) is provided with a first step hole (313), a second step hole (314), a third step hole (315), the guide hole (312) and a circular hole (316) which are interconnected in sequence along the water flow direction; the valve seat (33) is connected to the first step hole (313); and the circular hole (316) is connected to the water passage hole (21) or the water outlet hole (12); The third step hole (315) comprises a large-diameter section (3151) and a small-diameter section (3152); one end of the elastic member (35) is connected to the small-diameter section (3152); the other end of the elastic member (35) is connected to the valve core (34); one end of the valve core (34) is located in the large-diameter section (3151), and the other end is inserted into the second step hole (314), so that when the valve core (34) is at the maximum stroke, the valve core (34) abuts against the connection between the large-diameter section (3151) and the small-diameter section (3152).

5. The double one-way valve of the novel structure according to claim 4 is characterized in that: The inner periphery of the first step hole (313) and the outer periphery of the valve seat (33) are threadedly connected; The second step hole (314) includes a first hole section (3141) connected to the first step hole (313) and a second hole section (3142) for guiding the valve core (34), wherein the second hole section (3142) is smaller than the aperture of the large aperture section (3151) and larger than the aperture of the small aperture section (3152).

6. The double one-way valve of the novel structure according to claim 5 is characterized in that: The inner circumference of the second hole section (3142) cooperates with the outer circumference of the valve core (34) to guide the valve core (34); the inner circumference of the second hole section (3142) is provided with a spiral flow groove (31421).

7. The double one-way valve of the novel structure according to claim 4 is characterized in that: A first through hole (317) is formed on a side of the second step hole (314) close to the valve seat (33), a second through hole (318) is formed on the hole wall of the large-diameter section (3151), and a third through hole (319) is formed on the hole wall of the circular hole (316), wherein the first through hole (317), the second through hole (318) and the third through hole (319) are respectively connected to the interior of the valve cavity (10) and the valve sleeve (31); Wherein, the first through hole (317) and the third through hole (319) are both inclined holes, the water flow direction of the first through hole (317) is inclined from the inside of the valve sleeve (31) toward the valve cavity (10) and the water outlet hole (12), and the water flow direction of the third through hole (319) is inclined from the valve cavity (10) toward the valve sleeve (31) and the water outlet hole (12).

8. The double one-way valve of the novel structure according to claim 1 is characterized in that: The valve body (1) is also connected to a safety valve assembly (4) for regulating the internal pressure of the valve body (1), the safety valve assembly (4) comprising a safety valve (41) and a joint (42), the valve body (1) being provided with a mounting hole (13) for mounting the joint (42), the safety valve (41) being connected to the mounting hole (13) via the joint (42), wherein the partition (2) is provided with a connecting hole (22), the connecting hole (22) being in communication with the water passage hole (21) and the mounting hole (13).

9. The double one-way valve of the novel structure according to claim 1 is characterized in that: The valve body (1) is also connected to a valve cover (5) for limiting the position of the valve sleeve (31); one end of the valve cover (5) abuts against the valve sleeve (31), and the other end of the valve cover (5) is detachably connected to the valve body (1).

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