A water pump with a built-in mechanical one-way valve double check valve function

Abstract

The application discloses a water pump with a built-in mechanical one-way valve double check valve function, comprising a water inlet control assembly and an electromagnetic drive pumping assembly connected with each other, wherein the water inlet control assembly comprises a first valve body, a first plug, a first elastic member, a diaphragm and a top opening member; the electromagnetic drive pumping assembly comprises a second valve body, a movable core, a coil, a second plug and a third plug arranged on a water outlet channel; the diaphragm divides a first cavity in the water inlet control assembly into a first chamber communicated with the atmosphere and a second chamber communicated with the electromagnetic drive pumping assembly; when the coil is powered, the movable core moves to generate negative pressure in the second chamber; the diaphragm drives the top opening member to push away the first plug, and the second plug and the third plug are opened at the same time; when the coil is powered off, the movable core resets, and the three plugs respectively close corresponding channels. The pump and the double check valve are integrated, double physical separation of the water inlet end and the water outlet end is realized when the coil is powered off, and backflow prevention is reliable.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment technology, specifically relating to a water pump with a built-in mechanical check valve and dual backflow prevention function. Background Technology

[0002] As a common fluid transport device, water pumps are widely used in water supply, drainage, and circulation systems. In practical applications, when a water pump is shut down due to malfunction, maintenance, or planned shutdown, a siphon or back pressure often occurs in the pipeline system, causing fluid to flow back from the outlet to the inlet. This backflow may not only damage the water pump itself, but more seriously, it may cause water pollution, system pressure loss, or equipment malfunction, thereby affecting the safety and stability of the entire system.

[0003] To address the aforementioned issues, existing technologies typically employ the installation of an independent check valve on the external pipeline of the water pump. However, this external approach has several drawbacks: First, it increases the number of system components and installation complexity, raising material and labor costs. Second, external check valves require additional installation space, hindering equipment miniaturization and integration. Third, each additional connection point increases the risk of leakage, reducing the overall reliability of the system. Finally, traditional check valves are mostly simple check structures, and their sealing performance may be insufficient when the pressure difference is small or when bidirectional pressure changes alternately.

[0004] Therefore, developing a water pump that integrates efficient and reliable dual backflow prevention functions and can automatically physically lock the water circuit when power is off is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a water pump with a built-in mechanical check valve and dual backflow prevention function, so as to solve the problems of easy fluid backflow when the water pump stops, high cost and low reliability caused by the need to install an external check valve.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A water pump with a built-in mechanical check valve and dual backflow prevention function includes an inlet control component and an electromagnetic drive pumping component connected to each other. The water inlet control assembly includes a first valve body, a first plug disposed within the first valve body, a first elastic member cooperating with the first plug, a diaphragm disposed on the first valve body, and a push-opening member connected to the diaphragm. The push-opening member is movably inserted into the first valve body and selectively pushes the first plug. The electromagnetic drive pumping assembly includes a second valve body, a movable core disposed within the second valve body, a coil for driving the movable core, and a second plug and a third plug disposed on the water outlet channel of the electromagnetic drive pumping assembly. The movable core has a second channel connecting its two sides inside, and the second plug is disposed at the outlet end of the second channel. The interior of the first valve body has at least a first cavity for the movement of the diaphragm, and the diaphragm divides the first cavity into a first chamber that communicates with the outside atmosphere and a second chamber that communicates with the electromagnetic drive pumping assembly. When the coil is energized, the movement of the movable core creates a negative pressure in the second chamber. The diaphragm drives the top opening component to push open the first plug. At the same time, the pumping action of the movable core opens the second and third plugs, forming a water pumping passage. When the coil is de-energized, the movable core resets, the first plug closes the water inlet channel under the action of the first elastic element, the second plug closes the second channel, and the third plug closes the water outlet channel.

[0007] Therefore, the pumping unit is highly integrated with the one-way valves at the inlet and outlet, eliminating the need for any external one-way valves. When powered on, the pump water passage is automatically established, and when powered off, the automatic reset of the first, second, and third plugs simultaneously forms a physical barrier in the inlet and outlet channels, achieving bidirectional double backflow prevention. This fundamentally eliminates backflow caused by siphon or back pressure, resulting in a compact structure and high reliability.

[0008] In some embodiments, a second cavity and a first channel connecting the second chamber and the second cavity are also formed in the first valve body. The first plug is movably installed in the second cavity and can block the first channel under the action of the first elastic member. The first elastic member abuts between the first plug and the first valve seat. One end of the push-opening member is fitted onto the diaphragm, and the other end is movably fitted into the first channel and cooperates with the first plug.

[0009] Therefore, a water inlet check valve structure consisting of a first channel, a second cavity, a first plug, and a first elastic element is constructed within the first valve body, and the assembly relationship between the top opening element and the first channel is clearly defined. This design enables the top opening element to slide precisely within the first channel and push the first plug, achieving precise linkage between the diaphragm negative pressure drive and the plug opening. This ensures smooth opening of the water inlet channel when energized, while the first elastic element reliably presses the first plug against the first channel when de-energized, enhancing the sealing performance of the water inlet end.

[0010] In some embodiments, the water inlet control assembly further includes a first valve seat installed at the bottom of the first valve body and a first valve cover installed at the top of the first valve body. The first valve cover presses the edge of the diaphragm against the first valve body, forming a first cavity between the first valve cover and the first valve body, and forming a second cavity between the first valve seat and the first valve body. The first valve cover has a through hole that connects the first cavity to the outside atmosphere.

[0011] Thus, the diaphragm edge is firmly pressed to the first valve body by the first valve cover, and the first chamber is connected to the atmosphere by the through hole on the first valve cover, forming a stable and reliable differential pressure driving interface. The first valve seat and the first valve body enclose the second cavity, providing a precise installation space for the first plug and the first elastic element. This structure not only ensures the diaphragm's sensitive response to negative pressure, but also simplifies the assembly process and improves the sealing reliability.

[0012] In some embodiments, the water inlet control assembly further includes a first tubular member and a second tubular member, the first end of the first tubular member being connected to a second cavity within the first valve body, the first end of the second tubular member being connected to a first channel within the first valve body, and the second end of the second tubular member being connected to the water inlet end of the electromagnetically driven pumping assembly.

[0013] Thus, the specific water inlet and outlet paths of the water inlet control component are clarified: the first tubular component connects to the second cavity and forms a water inlet, the second tubular component connects to the first channel and serves as a connection interface with the electromagnetic drive pumping component, and the second tubular component is directly connected to the water inlet end of the pumping component, reducing intermediate pipes and joints, reducing the risk of leakage, and making the overall flow path shorter and more compact.

[0014] In some embodiments, the electromagnetically driven pumping assembly further includes a third tubular member, a fourth tubular member, and a fifth tubular member. The third tubular member is fitted inside the second valve body, the coil is fitted around the outer periphery of the third tubular member, the movable core is movably fitted inside the third tubular member, and the fourth tubular member is located at the end of the second valve body away from the water inlet control assembly, and the fifth tubular member is fitted inside it. The third tubular member, the movable core, and the second tubular member together enclose and form a third cavity.

[0015] Thus, through the coaxial assembly structure of the third, fourth, and fifth tubular components, the coil, movable core, and internal flow channel are integrated into an electromagnetic drive unit. The third tubular component, movable core, and second tubular component together form a third cavity, providing a closed space for the generation and transmission of negative pressure. This layout is compact and has an optimized magnetic circuit, improving electromagnetic drive efficiency and pumping capacity.

[0016] In some embodiments, the electromagnetically driven pumping assembly further includes a second elastic element that cooperates with the second plug. The movable core is a stepped rod-shaped member, with its large end movably fitted into the third tubular member and its small end extending into the fifth tubular member and sealingly cooperating with the fifth tubular member. The movable core and the fifth tubular member enclose a fifth cavity, and the second plug and the second elastic element are disposed in the fifth cavity.

[0017] Thus, the large end of the stepped movable core is guided and matched with the third tubular component, and the small end is slidably sealed with the fifth tubular component through the fourth sealing component, ensuring smooth movement and sealing. The fifth cavity formed by the movable core and the fifth tubular component is equipped with a second plug and a second elastic component, which constitutes a miniature one-way valve integrated inside the movable core, laying the foundation for subsequent negative pressure formation and directional fluid delivery.

[0018] In some embodiments, a second channel is provided in the center of the movable core, the second channel connecting the third cavity and the fifth cavity, and the second plug is pressed against the movable core under the action of the second elastic element to normally close the outlet of the second channel.

[0019] Therefore, the second channel at the center of the movable core directly connects the third and fifth cavities, shortening the fluid path. The second plug, under the action of the second elastic element, normally closes the outlet of the second channel. When negative pressure is generated in the fifth cavity due to the rightward movement of the movable core, the second plug is drawn open, and the negative pressure is rapidly transmitted to the third and second cavities. When the movable core returns to its original position, the second plug immediately closes to prevent backflow. This structure is highly responsive and reliably sealed, making it crucial for achieving efficient pumping.

[0020] In some embodiments, the electromagnetically driven pumping assembly further includes a fourth elastic member disposed in the third cavity, one end of which abuts against the second tubular member and the other end of which abuts against the movable core. A fifth elastic member is fitted around the outer periphery of the movable core, one end of which abuts against the movable core and the other end of which abuts against the fifth tubular member.

[0021] Therefore, the fourth elastic element (one end abutting the second tubular element, the other end abutting the movable core) provides a precise reset force to the movable core after the coil is de-energized, ensuring its rapid return to position. The fifth elastic element (one end abutting the movable core, the other end abutting the fifth tubular element) pushes the relevant sealing elements to press tightly, enhancing the dynamic seal between the small end and the fifth tubular element, preventing fluid leakage from the sliding interface, and at the same time assisting in the axial positioning of the movable core, improving working stability.

[0022] In some embodiments, the electromagnetically driven pumping assembly further includes a third elastic member disposed within the fourth tubular member and cooperating with the third plug. The first end of the fourth tubular member forms a water outlet and a water outlet channel connecting the fifth cavity and the water outlet. The second end of the fifth tubular member has a second limiting groove, and the third plug is installed in the second limiting groove. The two ends of the third elastic member abut against the fourth tubular member and the third plug, respectively. The third plug can be pressed against the fifth tubular member under the action of the third elastic member to normally close the water outlet channel.

[0023] Therefore, a third plug and a third elastic element are installed on the water outlet channel to form an independent one-way valve at the water outlet end. The two ends of the third elastic element abut against the fourth tubular component and the third plug respectively, so that the third plug normally closes the water outlet channel. When back pressure occurs outside the water outlet, the water pressure and the elastic force of the third elastic element work together to press the third plug more tightly, realizing a reliable physical isolation at the water outlet end. This structure forms a double protection with the one-way valve at the water inlet end, and can automatically seal the outlet regardless of which end the pressure comes from.

[0024] In some embodiments, the water inlet control assembly further includes a first sealing element fitted around the outer periphery of the second tubular member and sealingly engaged with the third tubular member, and a fourth sealing element fitted around the outer periphery of the movable core and sealingly engaged with the fifth tubular member. The electromagnetic drive pumping assembly further includes a second sealing element fitted around the outer periphery of the third tubular member and sealingly engaged with the fourth tubular member.

[0025] Thus, through three key seals—the first seal (between the second and third tubular components), the fourth seal (between the small end of the moving core and the fifth tubular component), and the second seal (between the third and fourth tubular components)—the sealing performance of the entire machine is comprehensively improved. The first and second seals ensure static sealing at the component connections and the water outlet, respectively, while the fourth seal ensures sealing at the dynamic sliding interface. These multiple seals effectively prevent fluid leakage, extend product lifespan, and improve the overall reliability of the machine.

[0026] The beneficial effects of this invention are: 1. High reliability: Backflow prevention is achieved entirely through the combined action of fluid pressure, elastic components, and electromagnetic force, eliminating the need for electronic sensors or controllers and fundamentally avoiding the risk of electronic failure.

[0027] 2. Dual physical isolation: When the power is off, the first plug closes the water inlet channel and the third plug closes the water outlet channel, forming two independent sealing barriers. Even if one fails, the other can still ensure safety.

[0028] 3. Bidirectional check valve: It can automatically and effectively seal the backflow pressure from either the inlet or outlet end, adapting to complex working conditions.

[0029] 4. High integration: The water pump and the inlet and outlet check valves are integrated into one unit, eliminating the need for external check valves and connecting parts, reducing costs, reducing leakage points, and saving installation space.

[0030] 5. Optimize sealing and assembly structure: Through multi-level limiting steps, sealing grooves and elastic elements, ensure precise positioning and reliable guidance of each moving part, significantly improving product durability and service life. Attached Figure Description

[0031] Figure 1 A perspective view of a water pump according to one embodiment of the present invention; Figure 2 For Figure 1 A top view of the water pump; Figure 3 for Figure 2 The cross-sectional view of the water pump shown is along the AA direction; Figure 4 for Figure 1 The diagram shown is an exploded view of part of the water pump's structure. Figure 5 for Figure 4 The diagram shows a 3D view of the water pump's inlet control assembly with some structural elements omitted. Figure 6 This is an exploded view of the water inlet control component of the present invention; Figure 7 This is a cross-sectional view of the water inlet control component of the present invention; Figure 8 This is an exploded view of the electromagnetic drive pumping assembly of the present invention; Figure 9 This is a cross-sectional view of the electromagnetic drive pumping assembly of the present invention.

[0032] Figure 1-9Reference numerals in the attached drawings: 1-Inlet control assembly; 2-Electromagnetic drive pumping assembly; 10-First valve body; 11-First valve seat; 12-First valve cover; 13-First plug; 14-First elastic element; 15-Diaphragm; 16-Push-opening element; 17-First sealing element; 18-First tubular element; 19-Second tubular element; 20-Second valve body; 21-Second sealing element; 22-Third sealing element; 23-Fourth sealing element; 24-Second elastic element; 25- 26-Third elastic element; 27-Five elastic element; 28-Moving core; 29-Third tubular component; A-First cavity; B-Second cavity; C-Third cavity; D-Fourth cavity; E-Fifth cavity; 101-First channel; 102-First protrusion; 103-Second protrusion; 104-Third limiting groove; 111-Second limiting step; 112-Third protrusion; 131-First limiting step; 121-Through hole; 122- First limiting groove; 181-Inlet; 191-Fourth limiting groove; 201-Outer shell; 202-First sleeve; 203-Second sleeve; 204-Third sleeve; 205-First plate-shaped piece; 206-Second plate-shaped piece; 210-Fourth tubular piece; 211-Fifth tubular piece; 212-Coil; 213-Second plug; 214-Third plug; 215-First washer; 216-Second washer; 280-Second channel; 281-Large Head end; 282-Small head end; 283-Fourth limiting step; 284-Fifth limiting step; 201a-Second clearance hole; 202a-First clearance hole; 202b-Seventh limiting step; 202c-Eighth limiting step; 210a-Outlet; 210b-Outlet channel; 210c-Ninth limiting step; 210d-External thread; 211a-Third limiting step; 211b-Second limiting groove; 214a-Sixth limiting step. Detailed Implementation

[0033] The technical solutions of the embodiments 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, and 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.

[0034] like Figures 1 to 9As shown, this invention provides a water pump with a built-in mechanical check valve and dual backflow prevention function. The core of this water pump lies in the high integration of the pumping unit and two functionally independent check valve units into one unit. Its overall structure is mainly divided into two major components: the water inlet control component 1 and the electromagnetic drive pumping component 2. The water inlet control component 1 serves as the water inlet control unit and integrates a diaphragm pilot valve structure driven by differential pressure. The electromagnetic drive pumping component 2 serves as the power and water outlet control unit and integrates an electromagnetic drive unit and two mechanical check valves controlled by elastic elements. The water inlet control component 1 and the electromagnetic drive pumping component 2 are sealed and connected through a tubular structure. During operation, the electromagnetic drive unit of the electromagnetic drive pumping assembly 2 generates pumping power and negative pressure. This negative pressure controls the diaphragm pilot valve of the inlet control assembly 1 to open, thereby allowing fluid to flow from the inlet through the internal flow channels of the inlet control assembly 1 and the electromagnetic drive pumping assembly 2, and finally be discharged from the outlet. When the power is off, the electromagnetic force disappears, the movable core 28 inside the electromagnetic drive pumping assembly 2 resets, and at the same time, the two check valves inside it and the check valve in the inlet control assembly 1 will automatically close under the action of their respective elastic elements and fluid pressure, forming two independent physical sealing barriers to completely prevent the fluid from flowing back from the inlet or outlet.

[0035] like Figure 3-7 As shown, the water inlet control assembly 1 includes a first valve body 10, a first valve seat 11, a first valve cover 12, a first plug 13, a first elastic element 14, a diaphragm 15, a push-opening element 16, a first sealing element 17, a first tubular element 18, and a second tubular element 19.

[0036] The first valve body 10 is the main frame, which is generally hollow in the shape of a block or cylinder. The first tubular member 18 and the second tubular member 19 are respectively disposed at both ends of the width direction of the first valve body 10. The first ends of both are connected to the internal space of the first valve body 10. The second end of the first tubular member 18 forms a water inlet 181 for connecting to an external water inlet pipe. The second end of the second tubular member 19 is used to connect to the water inlet of the electromagnetic drive pumping assembly 2.

[0037] The interior of the first valve body 10 has a first cavity A and a second cavity B distributed along the height direction. Specifically, a first valve cover 12 is installed on the top of the first valve body 10, and the two together form the first cavity A; a first valve seat 11 is installed on the bottom of the first valve body 10, and the two together form the second cavity B. A diaphragm 15 is installed on the top of the first valve body 10 and divides the first cavity A into two isolated parts: the part above the diaphragm 15 is the first chamber A1, and the part below the diaphragm 15 is the second chamber A2.

[0038] The interior of the first valve body 10 also forms a first channel 101 for connecting the second chamber A2 and the second cavity B. Preferably, the first channel 101 is formed by a downwardly extending first protrusion 102 (annular rib) inside the first valve body 10 and the root of the second tubular member 19.

[0039] A through hole 121 (preferably circular) is provided at the top center of the first valve cover 12. The through hole 121 connects the first chamber A1 with the external atmospheric environment. Therefore, no matter how the diaphragm 15 moves, the pressure in the first chamber A1 is always equal to the atmospheric pressure.

[0040] The first plug 13 is movably installed in the second cavity B. Its first end (top) mates with the lower port of the first channel 101 (i.e., the bottom end of the first protrusion 102) (specifically, in a fitted manner) to seal the lower port of the first channel 101 under the action of the first elastic member 14. The second end (bottom) of the first plug 13 forms a first limiting step 131, and the bottom inner side of the first valve seat 11 forms a second limiting step 111. One end of the first elastic member 14 is fitted and abuts against the first limiting step 131, and the other end is fitted and abuts against the second limiting step 111. The first elastic member 14 is preferably a compression spring. After the first valve seat 11 is assembled, the first elastic member 14 is compressed, always applying an upward preload force to the first plug 13, so that it is tightly pressed against the first protrusion 102 when no external force is applied, thereby normally closing the first channel 101.

[0041] The diaphragm 15 is made of a flexible elastic material (such as rubber, silicone, etc.) and is installed on the top of the first valve body 10. Preferably, the top of the first valve body 10 has an annular second protrusion 103, and the bottom of the first valve cover 12 has a matching first limiting groove 122, or vice versa. The edge of the diaphragm 15 is pressed tightly against the top of the first valve body 10 by the first valve cover 12. When the first valve cover 12 is fixed to the first valve body 10 by screws or other means, the edge of the diaphragm 15 is firmly pressed, thereby achieving reliable sealing and isolation between the first chamber A1 and the second chamber A2.

[0042] The push-opening member 16 is preferably a conical or stepped top post. Its first end (upper end) is connected to the center of the diaphragm 15 (preferably fitted into the center of the diaphragm 15), and its second end (lower end) passes downward through the second chamber A2 and is fitted into the first channel 101, and can move under the action of the diaphragm 15. The lower end of the push-opening member 16 is directly opposite the top of the first plug 13. When the push-opening member 16 moves downward, it contacts and pushes the first plug 13 downward, causing it to overcome the elastic force of the first elastic member 14 and move away from the first protrusion 102, thereby opening the first channel 101.

[0043] Preferably, the bottom of the first valve body 10 has an annular third limiting groove 104, and the top of the first valve seat 11 has a matching third protrusion 112 (annular protrusion), or vice versa. This facilitates the quick assembly of the first valve seat 11 and the first valve body 10, as well as the limiting of the first valve seat 11.

[0044] like Figure 3-9 As shown, the electromagnetically driven pumping assembly 2 includes a second valve body 20, a movable core 28, a coil 212, a second plug 213, a third plug 214, a third tubular component 29, a fourth tubular component 210, a fifth tubular component 211, a second seal 21, a third seal 22, a fourth seal 23, a second elastic component 24, a third elastic component 25, a fourth elastic component 26, a fifth elastic component 27, a first washer 215, and a second washer 216.

[0045] The third tubular component 29 serves as the central skeleton and is fitted horizontally into the center of the second valve body 20.

[0046] Preferably, the second valve body 20 includes a housing 201, a first sleeve 202, a second sleeve 203, a third sleeve 204, a first plate-shaped member 205, and a second plate-shaped member 206. The first sleeve 202 has an I-shaped cross-section and is fitted around the outer periphery of the third tubular member 29, forming an annular fourth cavity D between it and the housing 201. The coil 212 is installed in the fourth cavity D and tightly fitted onto the first sleeve 202. The first sleeve 202 and the housing 201 (bottom) are respectively provided with a first clearance hole 202a and a second clearance hole 201a for the lead wire of the coil 212 to be led out. The first plate-shaped member 205 and the second plate-shaped member 206 are also fitted around the outer periphery of the third tubular member 29, wherein: the first plate-shaped member 205 is located between the left end face of the first sleeve 202 and the fourth tubular member 210, and the second plate-shaped member 206 is located between the right end face of the first sleeve 202 and the right inner wall of the housing 201. The inner wall of the first sleeve 202 has a seventh limiting step 202b and an eighth limiting step 202c. The second sleeve 203 and the third sleeve 204 are respectively fitted onto the outer periphery of the third tubular member 29, and are located within the spaces enclosed by the seventh limiting step 202b and the first plate member 205, and the eighth limiting step 202c and the second plate member 206, respectively. This combination structure of multi-layered sleeves and plate members enables precise positioning and magnetic circuit optimization of the coil 212 and the third tubular member 29.

[0047] The fourth tubular component 210 is located at the left end of the second valve body 20 (the end away from the water inlet control component 1). The first end (left end) of the fourth tubular component 210 has an outlet 210a, and its outer wall is provided with an external thread 210b that mates with the external water outlet pipe. The second end (right end) of the fourth tubular component 210 has a stepped diameter expansion structure, and the second end face of the fourth tubular component 210 is in contact with the left end face of the first plate-shaped component 205.

[0048] The fifth tubular component 211 is fitted inside the fourth tubular component 210. The movable core 28 is a stepped rod-shaped component with a large end 281 on the right and a small end 282 on the left. The large end 281 is movably fitted inside the third tubular component 29, while the small end 282 extends to the left into the interior of the fifth tubular component 211 and is sealed to the inner wall of the right end of the fifth tubular component 211 by the fourth sealing component 23 (such as an O-ring) fitted around its outer periphery.

[0049] The third tubular member 29, the large end 281 of the movable core 28, and the second tubular member 19 together form a third cavity C. A fourth elastic member 26 is provided in the third cavity C. The right end of the fourth elastic member 26 abuts against the left end face of the second tubular member 19, and the left end abuts against the right end face of the large end 281 of the movable core 28. The fourth elastic member 26 always applies a leftward thrust to the movable core 28.

[0050] At the connection between the movable core 28 and the small end 282 (i.e., at the stepped shoulder), a fourth limiting step 283 and a fifth limiting step 284 are formed sequentially from left to right. A second washer 216 and a fifth elastic element 27 are also fitted onto the small end 282 of the movable core 28. The right end of the fifth elastic element 27 abuts against the fourth limiting step 283, and the left end abuts against the second washer 216. Under the thrust of the fifth elastic element 27, the second washer 216 is pressed against the right end face of the fifth tubular member 211, and simultaneously presses the fourth sealing element 23 to the left against the third limiting step 211a on the inner wall of the fifth tubular member 211, thus forming an initial seal. Furthermore, the first washer 215 is fitted onto the outer circumference of the fifth tubular member 211 and pressed against the inner wall of the third tubular member 29 by the fifth tubular member 211, serving as an auxiliary positioning and sealing element.

[0051] A second axial channel 280 is provided at the center of the movable core 28, which connects the third cavity C and the fifth cavity E. The fifth cavity E is formed by the small end 282 of the movable core 28, the fifth tubular member 211, and the second plug 213. The second plug 213 is movably disposed in the fifth cavity E, with a second elastic member 24 fitted on its left end. The right end of the second elastic member 24 abuts against the second plug 213, and the left end abuts against the inner wall formed inside the fifth tubular member 211. Under the action of the second elastic member 24, the second plug 213 is pressed against the leftmost end face of the small end 282 of the movable core 28, thereby normally closing the left end outlet of the second channel 280.

[0052] A second limiting groove 211b is provided at the left end (second end) of the fifth tubular member 211, and a third plug 214 is installed therein. A sixth limiting step 214a is formed on the third plug 214. The right end of the third elastic member 25 is fitted onto the third plug 214 and abuts against the sixth limiting step 214a, while the left end abuts against the inner wall of the fourth tubular member 210. Under the action of the third elastic member 25, the third plug 214 is pressed against the fifth tubular member 211, thereby normally closing the water outlet channel 210b connecting the fifth cavity E and the water outlet 210a.

[0053] At each connection interface, a sealing element is provided. For example, the outer wall of the second tubular member 19 has a third limiting groove 191, which houses the first sealing element 17 (such as an O-ring) and seals the inner wall of the right end of the third tubular member 29. The right end face of the fourth tubular member 210 has a ninth limiting step 210c. The second sealing element 21 is fitted onto the outer periphery of the third tubular member 29 and is pressed against the ninth limiting step 210c by the second plate 206, achieving a static seal between the third tubular member 29 and the fourth tubular member 210. The movable core 28 and the fifth tubular member 211 are sealed together by the fourth sealing element 23.

[0054] The operating process of the water pump with a built-in mechanical check valve and dual backflow prevention function of the present invention is as follows: 1. Power-on operating status (pump water circulation): When the water pump is powered on and started, coil 212 generates an electromagnetic field. This electromagnetic force overcomes the elastic force of the fourth elastic element 26, driving the movable core 28 to move rapidly to the right (towards the second tubular element 19). The rightward movement of the movable core 28 has two direct consequences: First, its large end 281 compresses the third cavity C to the right, causing the volume of the third cavity C to decrease and the internal fluid pressure to increase instantaneously; second, its small end 282 is pulled out of the fifth cavity E to the right, causing the volume of the fifth cavity E to increase and the internal pressure to decrease instantaneously, forming a vacuum negative pressure.

[0055] Because a negative pressure is formed in the fifth cavity E, while the pressure in the third cavity C is relatively high, the second plug 213 is drawn open under the action of the pressure difference, compressing the second elastic element 24 and moving it away from the left end face of the movable core 28. The second channel 280 is opened. At this time, the third cavity C, the second channel 280, the fifth cavity E, and the water outlet channel 210b are connected in sequence. The reciprocating motion of the movable core 28 (controlled by the on / off or polarity change of the electromagnetic field, or by continuous oscillation in conjunction with the external control circuit) continuously draws fluid from the third cavity C through the second channel 280 into the fifth cavity E, and then pushes it towards the water outlet 210a through the water outlet channel 210b. During this process, the third plug 214 will be pushed open by overcoming the elastic force of the third elastic element 25 under the positive fluid pressure, allowing the fluid to flow out.

[0056] At the same time, the negative pressure in the fifth cavity E is transmitted to the third cavity C through the second channel 280, and then to the second chamber A2 (the chamber below the diaphragm 15) through the second tubular member 19 and the upper end of the first channel 101. At this time, the lower part of the diaphragm 15 (the second chamber A2) is under negative pressure, while the upper part of the diaphragm 15 (the first chamber A1) is connected to the atmosphere through the through hole 121, and its pressure is constant at atmospheric pressure. Therefore, a significant pressure difference is formed on the upper and lower sides of the diaphragm 15 (the pressure is small at the bottom and large at the top). When the downward resultant force generated by this pressure difference is greater than the preload of the first elastic member 14, the diaphragm 15 is attracted downward, deforms, and drives the top opening member 16 connected to it to move downward together.

[0057] The downward-moving top opening member 16 impacts and pushes the first plug 13, causing it to overcome the elastic force of the first elastic member 14 and move away from the first protrusion 102, thereby opening the lower end of the first channel 101. At this time, the water inlet 112, the second cavity B, the first channel 101, the second tubular member 19, the third cavity C, the second channel 280, the fifth cavity E, and the water outlet channel 210b are completely connected in sequence.

[0058] At this point, the water inlet is fully opened. Under the continuous pumping action of the electromagnetically driven pumping component 2, the fluid is drawn in from the inlet 112, flows through the aforementioned passage, and is finally pumped out continuously from the outlet 210a.

[0059] Summary of the power-on process: Coil 212 is energized → Movable core 28 moves to the right, generating negative pressure in the fifth cavity E → Second plug 213 is pulled open → Negative pressure is transmitted to the second chamber A2 → Diaphragm 15 moves downward under the action of pressure difference → Top opening part 16 pushes open the first plug 13 → Water inlet is fully opened, and the water pump works normally.

[0060] 2. Power failure prevention mode (double backflow prevention): When the water pump is de-energized, the electromagnetic force of coil 212 disappears, and the movable core 28 quickly resets to the left under the elastic force of the fourth elastic element 26. When the movable core 28 moves to the left, the volume of the fifth cavity E decreases and the pressure increases, while the volume of the third cavity C increases and the pressure decreases. Under the combined action of the second elastic element 24 and the pressure difference, the second plug 213 immediately resets to the left, re-sealing the second channel 280. At the same time, the fifth elastic element 27 pushes the second washer 216 and the fourth sealing element 23 to the left, ensuring the seal between the small end 282 and the fifth tubular element 211.

[0061] At this point, two completely independent physical sealing barriers are formed inside the water pump: First layer of backflow prevention (for outlet pressure): If there is back pressure (pressure higher than the pump pressure) in the pipeline outside the outlet 210a, this pressure will act on the left side of the third plug 214. Under the combined action of the thrust of the third elastic element 25 and the external water pressure, the third plug 214 will be pressed more tightly against the left end face of the fifth tubular element 211, firmly sealing the outlet channel 210b. Fluid cannot flow back from the outlet 210a into the pump body, realizing the one-way shut-off function of "only out, no in".

[0062] The second layer of backflow prevention (for inlet pressure): If there is siphon or back pressure (pressure higher than the pump pressure) in the pipeline outside the inlet 112, the pressure will enter the second cavity B through the first tubular component 18 and act on the bottom of the first plug 13. This upward water pressure is in the same direction as the upward elastic force of the first elastic component 14. The combined force of the two will press the first plug 13 firmly against the first protrusion 102, thereby completely blocking the lower end of the first channel 101. Fluid cannot flow back from the inlet 112 into the pump body, realizing the one-way shut-off function of "only in, no out".

[0063] In summary, the power-off function works as follows: Regardless of whether the external pressure comes from the inlet or outlet, the corresponding plug inside the pump (first plug 13 or third plug 214) will automatically seal its passage under the dual action of its own elastic element and fluid pressure, forming two reliable physical barriers to completely prevent backflow.

[0064] The water pump of the present invention has at least the following advantages over the prior art: 1. Highly reliable passive anti-backflow mechanism: The anti-backflow function is achieved entirely by the combined action of fluid pressure, the elastic force of mechanical components such as the first elastic element 14, the second elastic element 24, the third elastic element 25, the fourth elastic element 26, and the fifth elastic element 27, and the electromagnetic force generated by the energization of the coil 212. It requires no electronic sensors, controllers, or additional actuators. Its operating principle is based on basic physical laws, fundamentally avoiding the risks caused by electronic component failure or logical errors. It has extremely high reliability and is especially suitable for unattended or safety-critical application scenarios.

[0065] 2. True physical "double" isolation and bidirectional shut-off capability: When coil 212 is de-energized, this invention can simultaneously form two independent, fully physically contacting hard seals in the inlet and outlet channels: On one hand, the first plug 13, under the action of the first elastic element 14, is tightly pressed against the first protrusion 102, cutting off the connection between the inlet 112 and the second cavity B; on the other hand, the third plug 214, under the action of the third elastic element 25, is tightly pressed against the fifth tubular element 211, cutting off the connection between the fifth cavity E and the outlet 210a. Regardless of whether the backflow pressure comes from the inlet or outlet, this device can automatically form an effective seal, possessing true bidirectional check valve capability. The double isolation provides redundant safety assurance; even if one seal fails due to long-term wear or impurity blockage, the other seal can still ensure system safety.

[0066] 3. Highly integrated design: The functions of three independent components of a traditional water pump—the pumping unit, the inlet check valve, and the outlet check valve—are integrated into a single inlet control component 1 and an electromagnetic drive pumping component 2 through a sophisticated mechanical structure. This not only eliminates the cost of purchasing and installing multiple independent components, but also reduces the number of connection points in the pipeline, lowers the risk of system leakage, and achieves miniaturization and lightweighting of the device, making it easy to install and use in space-constrained environments.

[0067] 4. Optimized Assembly and Sealing Structure: The second protrusion 103 and the first limiting groove 122 on the first valve body 10 reliably clamp the edge of the diaphragm 15. The third limiting groove 191 on the second tubular member 19 cooperates with the first seal 17 to achieve a sealed connection between the water inlet control assembly 1 and the electromagnetic drive pumping assembly 2. The ninth limiting step 210c on the fourth tubular member 210 cooperates with the second seal 21 and the second plate 206 to achieve a seal at the water outlet. This multi-stage limiting step and sealing groove structure ensures precise positioning and reliable guidance of all moving parts (such as the movable core 28, the first plug 13, and the diaphragm 15), significantly improving the product's durability and service life.

[0068] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A water pump with a built-in mechanical check valve and dual backflow prevention function, characterized in that, It includes an inlet water control assembly (1) and an electromagnetically driven pumping assembly (2) that are interconnected. The water inlet control assembly (1) includes a first valve body (10), a first plug (13) disposed in the first valve body (10), a first elastic member (14) cooperating with the first plug (13), a diaphragm (15) disposed on the first valve body (10), and a push-opening member (16) connected to the diaphragm (15). The push-opening member (16) is movably inserted into the first valve body (10) and selectively pushes the first plug (13). The electromagnetic drive pumping assembly (2) includes a second valve body (20), a movable core (28) disposed in the second valve body (20), a coil (212) for driving the movable core (28), and a second plug (213) and a third plug (214) disposed on the water outlet channel of the electromagnetic drive pumping assembly (2). The movable core (28) has a second channel (280) connecting its two sides inside, and the second plug (213) is disposed at the outlet end of the second channel (280). The first valve body (10) has at least a first cavity (A) for the movement of the diaphragm (15), the diaphragm (15) dividing the first cavity (A) into a first chamber (A1) communicating with the outside atmosphere and a second chamber (A2) communicating with the electromagnetic drive pumping assembly (2). When the coil (212) is energized, the movement of the movable core (28) causes the second chamber (A2) to generate negative pressure. The diaphragm (15) drives the top opening member (16) to push open the first plug (13). At the same time, the pumping action of the movable core (28) causes the second plug (213) and the third plug (214) to open, forming a pumping water passage. When the coil (212) is de-energized, the movable core (28) is reset, the first plug (13) closes the water inlet channel under the action of the first elastic element (14), the second plug (213) closes the second channel (280), and the third plug (214) closes the water outlet channel.

2. The water pump with a built-in mechanical check valve and dual backflow prevention function as described in claim 1, characterized in that, The first valve body (10) also forms a second cavity (B) and a first channel (101) connecting the second chamber (A2) and the second cavity (B). The first plug (13) is movably installed in the second cavity (B) and can block the first channel (101) under the action of the first elastic member (14). The first elastic member (14) abuts between the first plug (13) and the first valve seat (11). One end of the push-opening member (16) is fitted onto the diaphragm (15), and the other end is movably fitted into the first channel (101) and cooperates with the first plug (13).

3. The water pump with a built-in mechanical check valve and dual backflow prevention function as described in claim 2, characterized in that, The water inlet control assembly (1) further includes a first valve seat (12) installed at the bottom of the first valve body (10) and a first valve cover (12) installed at the top of the first valve body (10). The first valve cover (12) presses the edge of the diaphragm (15) against the first valve body (10). The first valve cover (12) and the first valve body (10) form the first cavity, and the first valve seat (12) and the first valve body (10) form the second cavity. The first valve cover (12) has a through hole (121) that connects the first cavity (A1) to the outside atmosphere.

4. The water pump with a built-in mechanical check valve and dual backflow prevention function as described in claim 1, characterized in that, The water inlet control assembly (1) further includes a first tubular component (18) and a second tubular component (19). The first end of the first tubular component (18) is connected to the second cavity (B) inside the first valve body (10). The first end of the second tubular component (19) is connected to the first channel (101) inside the first valve body (10). The second end of the second tubular component (19) is connected to the water inlet end of the electromagnetic drive pumping assembly (2).

5. The water pump with a built-in mechanical check valve and dual backflow prevention function according to claim 4, characterized in that, The electromagnetic drive pumping assembly (2) further includes a third tubular component (29), a fourth tubular component (210), and a fifth tubular component (211). The third tubular component (29) is fitted inside the second valve body (20). The coil (212) is fitted around the third tubular component (29). The movable core (28) is movably fitted inside the third tubular component (29). The fourth tubular component (210) is located at the end of the second valve body (20) away from the water inlet control assembly (1), and the fifth tubular component (211) is fitted inside it. The third tubular component (29), the movable core (28), and the second tubular component (19) together enclose a third cavity (C).

6. The water pump with a built-in mechanical check valve and dual backflow prevention function according to claim 5, characterized in that, The electromagnetic drive pumping assembly (2) also includes a second elastic element (24) that cooperates with the second plug (213). The movable core (28) is a stepped rod-shaped member. Its large end (281) is movably fitted into the third tubular member (29), and its small end (282) extends into the fifth tubular member (211) and is sealed to the fifth tubular member (211). The movable core (28) and the fifth tubular member (211) enclose to form a fifth cavity (E). The second plug (213) and the second elastic element (24) are disposed in the fifth cavity (E).

7. The water pump with a built-in mechanical check valve and dual backflow prevention function as described in claim 6, characterized in that, The center of the movable core (28) is provided with the second channel (280), which connects the third cavity (C) and the fifth cavity (E). The second plug (213) is pressed against the movable core (28) under the action of the second elastic member (24) to normally close the outlet of the second channel (280).

8. The water pump with a built-in mechanical check valve and dual backflow prevention function according to any one of claims 5-7, characterized in that, The electromagnetic drive pumping assembly (2) further includes a fourth elastic element (26) disposed in the third cavity (C). One end of the fourth elastic element (26) abuts against the second tubular member (19), and the other end abuts against the movable core (28). A fifth elastic element (27) is fitted around the outer periphery of the movable core (28). One end of the fifth elastic element (27) abuts against the movable core (28), and the other end abuts against the fifth tubular member (211).

9. The water pump with a built-in mechanical check valve and dual backflow prevention function according to claim 6 or 7, characterized in that, The electromagnetic drive pumping assembly (2) further includes a third elastic member (25) disposed in the fourth tubular member (210) and cooperating with the third plug (214). The first end of the fourth tubular member (210) forms an outlet (210a) and an outlet channel (210b) connecting the fifth cavity (E) and the outlet (210a). The second end of the fifth tubular member (211) is provided with a second limiting groove (211b). The third plug (214) is installed in the second limiting groove (211b). The two ends of the third elastic member (25) abut against the fourth tubular member (210) and the third plug (214) respectively. The third plug (214) can be pressed against the fifth tubular member (211) under the action of the third elastic member (25) to normally close the outlet channel (210b).

10. The water pump with a built-in mechanical check valve and dual backflow prevention function according to any one of claims 5-7, characterized in that, The water inlet control assembly (1) further includes a first sealing element (17) fitted around the outer periphery of the second tubular member (19) and sealingly engaged with the third tubular member (29), and a fourth sealing element (23) fitted around the outer periphery of the movable core (28) and sealingly engaged with the fifth tubular member (211). The electromagnetic drive pumping assembly (2) further includes a second sealing element (21) fitted around the outer periphery of the third tubular member (29) and sealingly engaged with the fourth tubular member (210).

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