A self-priming sewage pump and check valve structure

Abstract

The present invention relates to the field of check valves, and particularly to a self-priming sewage pump and a check valve structure, which includes a check valve body. The check valve body includes a middle-through section. One end of the middle-through section is provided with a water inlet, and the other end of the middle-through section is provided with a water outlet. A sealing ring is installed at the lower part inside the middle-through section. A sealing piston is installed on the upper side of the middle of the sealing ring. A sliding sleeve is installed in the middle of the top end of the sealing piston. A limiting sleeve is slidably connected inside the sliding sleeve. A return spring is arranged inside the limiting sleeve. A fixed chamber is arranged above the sealing piston. The middle part of the outer periphery of the fixed chamber is fixedly connected with a fixed frame. Through the fixed disk and the sealing plate, the present invention can directly intercept the falling water at the upper part, so as to cooperate with the sealing ring to realize double sealing inside the check valve body, and thus can effectively complete the check and sealing work.

Description

Technical Field

[0001] The present invention relates to the field of check valves, and in particular to a self-priming sewage pump and a check valve structure. Background Art

[0002] In a sewage discharge system, a check valve plays a crucial role. Its main function is to prevent sewage from flowing back, ensuring the normal operation of the sewage pump and the stability of the entire drainage system. However, there are many problems with existing check valves in practical applications. On the one hand, the sealing structure of traditional check valves is relatively simple. Usually, only a simple seal is relied on to close the passage. During long-term use, the return spring is prone to insufficient elasticity, resulting in the sealing piston not being able to fall back in time or not falling back in place, greatly reducing the sealing effect and being unable to effectively prevent sewage from flowing back. This not only increases the working burden of the sewage pump but may also cause serious damage to it, shortening the service life of the sewage pump. On the other hand, the real-time detection of the internal working state of the check valve has always been a difficult problem in the industry. Existing check valves lack an effective detection mechanism and cannot timely and accurately feedback their working state to the staff. Once a failure occurs, it is difficult to detect and repair in time, seriously affecting the efficiency and stability of sewage discharge work. Therefore, we propose a self-priming sewage pump and a check valve structure to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies in the background art and propose a self-priming sewage pump and a check valve structure.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a check valve structure, including a check valve body. The check valve body includes a middle-through section. One end of the middle-through section is provided with a water inlet, and the other end of the middle-through section is provided with a water outlet. A sealing ring is installed at the lower part inside the middle-through section. A sealing piston is installed on the upper side of the middle of the sealing ring. A sliding sleeve is installed in the middle of the top end of the sealing piston. A limiting sleeve is slidably connected inside the sliding sleeve. A return spring is arranged inside the limiting sleeve. A fixed chamber is arranged above the sealing piston. The middle part of the outer periphery of the fixed chamber is fixedly connected with a fixed frame, and the fixed frame is fixedly connected to the middle part inside the middle-through section. The middle part of the top end of the fixed chamber is fixedly connected with a top cylinder. The top of the limiting sleeve is fixedly connected to the upper part inside the top cylinder. A flow collecting groove is opened in the middle of the top end of the top cylinder.

[0005] Preferably, an outer chamber is installed on the upper part of the outer periphery of the middle-through section. A rotating ring is rotatably connected to the upper part inside the outer chamber. One side of the bottom of the rotating ring is fixedly connected with a fixed rod, and an opening and closing joint is installed at the bottom of the fixed rod.

[0006] Preferably, a signal transmitter is installed at the inner bottom of the outer bin, a detection ring is installed on the top of the signal transmitter, an opening and closing joint is arranged on the inner side of one end of the detection ring, a connection port is arranged at the other end of the detection ring, and the connection port corresponds to the end of the opening and closing joint.

[0007] Preferably, a rotating ring is rotatably connected to the middle part of the outer periphery of the top cylinder, guide grooves are formed on both sides of the outer periphery of the rotating ring, guide posts are slidably connected to the inner sides of the guide grooves, the bottoms of the guide posts penetrate through the top of the fixed bin, and the guide posts are slidably connected to the fixed bin.

[0008] Preferably, the bottoms of the guide posts are fixedly connected with fixing rings, the fixing rings are installed on the top of the sealing piston, top springs are arranged on both sides of the upper part of the fixing rings, the top springs are sleeved on the lower parts of the outer peripheries of the guide posts, and the top springs are arranged inside the fixed bin.

[0009] Preferably, a sealing plate is fixedly connected to the top of the rotating ring, a fixing disk is arranged on the upper part of the sealing plate, the fixing disk is fixedly connected to the upper part of the outer periphery of the top cylinder, and the fixing disk and the sealing plate are both arranged in the upper part of the middle through section.

[0010] Preferably, a magnetic ring is inlaid in the middle of the outer periphery of the sealing plate, the magnetic ring corresponds to the rotating ring, and the sealing plate and the magnetic ring are both rotatably connected to the inside of the middle through section.

[0011] Preferably, a water outlet ring is installed on the top of the sealing ring, uniformly distributed openings are formed in the middle of the water outlet ring, the water outlet ring is slidably connected to the sealing piston, and the tops of the openings are installed on the lower part of the outer periphery of the fixed bin.

[0012] Preferably, uniformly distributed water through holes are formed in the outer sides of the middle parts of the fixing disk and the sealing plate, and the water through holes on the fixing disk and the sealing plate correspond to each other.

[0013] Preferably, a self-priming sewage pump is used in cooperation with a check valve structure, and includes a sewage pump, and the drain outlet flange of the sewage pump is connected with a check valve body.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Under the action of the resilience of the return spring, the sealing piston will drop and cooperate with the sealing ring to close the internal passage of the check valve body. At the same time, under the action of the resilience of the top spring, the fixing ring can be pressed down by the top spring, and the guide post can be driven to descend synchronously through the fixing ring. When the guide post is driven to descend, the end of the guide post will drive the rotating ring to deflect through the guide groove, and the sealing plate can be driven to deflect synchronously through the rotating ring, so that the water passing hole on the fixing plate and the sealing plate will be misaligned. At this time, the fixing plate and the sealing plate can be combined to complete the closure of the upper part inside the check valve body, and the falling water can be directly intercepted at the upper part through the fixing plate and the sealing plate, so as to cooperate with the sealing ring to realize the double closure of the inside of the check valve body, and thus the check closure work can be effectively completed, which is beneficial to actual use.

[0016] During the process of closing the inside of the check valve body by the fixing plate and the sealing plate, the blocked water will enter the limiting sleeve through the flow collecting groove at the top of the top cylinder, and then the water will enter the sliding sleeve. The impact and water pressure of the flowing-back water can further impact the sliding sleeve and the sealing piston, accelerating the falling and resetting of the sealing piston, so as to reduce the amount of flowing-back water and reduce the damage of the backflow to the sewage pump. At the same time, the flowing-back water will continuously apply pressure to the sealing piston, so as to effectively improve the sealing effect between the sealing piston and the sealing ring, and avoid the situation that the resilience is insufficient after the return spring is used for a long time, resulting in poor reset sealing effect, and thus the service life of the check valve body can be greatly extended.

[0017] During the operation of the sewage pump, when the sealing plate rotates, it will drive the magnetic ring on the outer periphery to rotate synchronously. Through the magnetic ring, the rotating ring can be magnetically attracted to rotate synchronously. When the rotating ring rotates, it will drive the opening and closing joint to deflect synchronously through the fixing rod at the bottom, so that the end interface of the opening and closing joint can realize the connection and disconnection of both ends of the detection ring, and realize the opening and closing of the detection ring, so that the opening and closing of the detection ring can correspond to the opening and closing of the fixing plate and the sealing plate. When the detection ring is opened, it will transmit a working signal to people through the signal transmitter, showing the working state inside the check valve body, and realizing the real-time detection of the working state of the check valve body, which is beneficial to actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the check valve body of a self-priming sewage pump and check valve structure of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the combined state of the check valve body and the sewage pump of a self-priming sewage pump and check valve structure of the present invention;

[0020] Figure 3 It is a schematic internal structure diagram of the check valve body of a self-priming sewage pump and check valve structure of the present invention;

[0021] Figure 4 This is a schematic diagram of a partial structure inside the outer chamber of a self-priming sewage pump and check valve structure according to the present invention;

[0022] Figure 5 This is a schematic diagram of a partial structure at the sealing piston of a self-priming sewage pump and check valve structure according to the present invention;

[0023] Figure 6 This is a schematic diagram of a partial structure inside the middle through section of a self-priming sewage pump and check valve structure according to the present invention;

[0024] Figure 7 This is a schematic diagram of a partial structure at the return spring of a self-priming sewage pump and check valve structure according to the present invention;

[0025] Figure 8 This is a schematic diagram of a partial structure of the guide post and guide groove of a self-priming sewage pump and check valve structure according to the present invention.

[0026] 1. Check valve body; 101. Water inlet; 102. Water outlet; 103. Middle through section; 104. Outer chamber; 105. Water through hole; 106. Return spring; 107. Flow collecting groove; 108. Fixed disk; 109. Detection ring; 110. Signal transmitter; 111. Opening; 112. Water outlet ring; 113. Sealing ring; 114. Fixed rod; 115. Rotating ring; 116. Fixed frame; 117. Opening and closing joint; 118. Sliding sleeve; 119. Top spring; 120. Sealing piston; 121. Fixed ring; 122. Magnetic ring; 123. Fixed chamber; 124. Limit sleeve; 125. Top cylinder; 126. Guide post; 127. Guide groove; 128. Rotating ring; 129. Sealing plate; 2. Sewage pump. Specific embodiments

[0027] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0028] Such as Figures 1 - 8A check valve structure shown includes a check valve body 1. The check valve body 1 includes a middle-through section 103. One end of the middle-through section 103 is provided with a water inlet 101, and the other end of the middle-through section 103 is provided with a water outlet 102. A sealing ring 113 is installed at the lower part inside the middle-through section 103. A sealing piston 120 is installed on the upper side of the middle of the sealing ring 113. A sliding sleeve 118 is installed in the middle of the top end of the sealing piston 120. A limiting sleeve 124 is slidably connected inside the sliding sleeve 118. A return spring 106 is arranged inside the limiting sleeve 124. A fixed chamber 123 is arranged above the sealing piston 120. The middle part of the outer periphery of the fixed chamber 123 is fixedly connected with a fixed frame 116, and the fixed frame 116 is fixedly connected to the middle part inside the middle-through section 103. The middle part of the top end of the fixed chamber 123 is fixedly connected with a top cylinder 125. The top of the limiting sleeve 124 is fixedly connected to the upper part inside the top cylinder 125. A flow collecting groove 107 is opened in the middle of the top end of the top cylinder 125;

[0029] Further, in specific implementation, when water is discharged by the sewage pump 2, it will enter the inside of the check valve body 1 through the water inlet 101. The entering water will impact the sealing piston 120, causing the sealing piston 120 to be forced to retract. When the sealing piston 120 is forced to retract into the fixed chamber 123, the opening 111 on the water outlet ring 112 will be exposed. At this time, the entering water will be discharged through the opening 111 on the side and further upward through the water passing port 105, and finally will be discharged through the water outlet 102 into the drainage pipe to complete the drainage work of the sewage pump 2. When the sewage pump 2 stops working and no longer discharges water, under the action of the return force of the return spring 106, the sealing piston 120 will be reset, causing the sealing piston 120 to fall and cooperate with the sealing ring 113 to close the internal passage of the check valve body 1 and complete the check work. During the process of closing the inside of the check valve body 1 through the fixed disk 108 and the sealing plate 129, the blocked water will enter the inside of the limiting sleeve 124 through the flow collecting groove 107 at the top of the top cylinder 125. Then the water will enter the inside of the sliding sleeve 118. The impact and water pressure of the flowing-back water can further impact the sliding sleeve 118 and the sealing piston 120, accelerating the fall and reset of the sealing piston 120, thereby reducing the amount of flowing-back water and reducing the damage to the sewage pump 2 caused by backflow. At the same time, the flowing-back water will continuously apply pressure to the sealing piston 120, thereby effectively improving the sealing effect between the sealing piston 120 and the sealing ring 113 and avoiding the situation that the reset sealing effect is not good due to insufficient elasticity of the return spring 106 after long-term use, thereby greatly extending the service life of the check valve body 1.

[0030] Among them, an outer bin 104 is installed on the upper part of the outer periphery of the middle connection section 103. The upper part inside the outer bin 104 is rotatably connected with a rotating ring 115. One side of the bottom of the rotating ring 115 is fixedly connected with a fixed rod 114. An opening and closing joint 117 is installed at the bottom of the fixed rod 114. A signal transmitter 110 is installed at the inner bottom of the outer bin 104. A detection ring 109 is installed on the top of the signal transmitter 110. An opening and closing joint 117 is arranged on the inner side of one end of the detection ring 109. A connection port is arranged at the other end of the detection ring 109, and the connection port corresponds to the end of the opening and closing joint 117;

[0031] Furthermore, in specific implementation, when the sealing plate 129 rotates, it will drive the magnetic ring 122 on the outer periphery to rotate synchronously. Through the magnetic ring 122, the rotating ring 115 can be magnetically pulled to rotate synchronously. When the rotating ring 115 rotates, it will drive the opening and closing joint 117 to deflect synchronously through the fixed rod 114 at the bottom, so that the end interface of the opening and closing joint 117 can connect and disconnect the two ends of the detection ring 109, realizing the opening and closing of the detection ring 109, and making the opening and closing of the detection ring 109 correspond to the opening and closing of the fixed disk 108 and the sealing plate 129. When the detection ring 109 is opened, it will transmit a working signal to people through the signal transmitter 110, showing the working state inside the check valve body 1, realizing the real-time detection of the working state of the check valve body 1, which is beneficial to actual use.

[0032] Among them, fixed rings 121 are fixedly connected to the bottoms of the guide posts 126. The fixed rings 121 are installed on the tops of the sealing pistons 120. Top springs 119 are arranged on both sides of the upper part of the fixed rings 121. The top springs 119 are sleeved on the lower parts of the outer peripheries of the guide posts 126. The top springs 119 are arranged inside the fixed bins 123. A water outlet ring 112 is installed on the top of the sealing ring 113. Uniformly distributed openings 111 are formed in the middle of the water outlet ring 112. The water outlet ring 112 is slidably connected with the sealing piston 120. The tops of the openings 111 are installed on the lower parts of the outer peripheries of the fixed bins 123;

[0033] Furthermore, in specific implementation, when the sewage pump 2 works, when the sealing piston 120 is lifted, it will drive the guide posts 126 to rise synchronously through the fixed rings 121. Through the guide grooves 127, the rotating ring 128 can be driven to deflect to drive the sealing plate 129 to rotate, so that the water passing ports 105 on the sealing plate 129 can correspond to the water passing ports 105 on the fixed disk 108, realizing the opening of the internal passage of the check valve body 1 and facilitating the drainage work.

[0034] Among them, a rotating ring 128 is rotatably connected to the middle part of the outer circumference of the top cylinder 125. Guide grooves 127 are provided on both sides of the outer circumference of the rotating ring 128. Guide posts 126 are slidably connected to the inner sides of the guide grooves 127. The bottoms of the guide posts 126 penetrate through the top of the fixed bin 123, and the guide posts 126 are slidably connected to the fixed bin 123. A sealing plate 129 is fixedly connected to the top of the rotating ring 128. A fixed disk 108 is provided on the upper part of the sealing plate 129. The fixed disk 108 is fixedly connected to the upper part of the outer circumference of the top cylinder 125. The fixed disk 108 and the sealing plate 129 are both arranged in the upper part of the middle-through section 103. A magnetic ring 122 is inlaid in the middle part of the outer circumference of the sealing plate 129. The magnetic ring 122 corresponds to the rotating ring 115. The sealing plate 129 and the magnetic ring 122 are both rotatably connected to the inner side of the middle-through section 103. Uniformly distributed water through-holes 105 are provided on the outer sides of the middles of the fixed disk 108 and the sealing plate 129. The water through-holes 105 on the fixed disk 108 and the sealing plate 129 correspond to each other;

[0035] Further, in specific implementation, under the action of the resilience of the top spring 119, the fixing ring 121 can be pressed down by the top spring 119, and the guide post 126 can be driven to descend synchronously through the fixing ring 121. When the guide post 126 is driven to descend, the end of the guide post 126 will drive the rotating ring 128 to deflect through the guide groove 127. The sealing plate 129 can be driven to deflect synchronously through the rotating ring 128, so that the water through-holes 105 on the sealing plate 129 and the fixed disk 108 are misaligned. At this time, the upper part of the check valve body 1 can be closed by combining the fixed disk 108 and the sealing plate 129. The falling water can be directly intercepted at the upper part through the fixed disk 108 and the sealing plate 129, so as to cooperate with the sealing ring 113 to realize double sealing inside the check valve body 1, and thus the check valve closing work can be effectively completed, which is beneficial to actual use.

[0036] Among them, a self-priming sewage pump is used in cooperation with a check valve structure, including a sewage pump 2, and a check valve body 1 is flange-connected to the drain outlet of the sewage pump 2;

[0037] Further, in specific implementation, people can install the check valve body 1 on the sewage pump 2, so as to prevent water from flowing back and reverse flow when the check valve body 1 drains water, and avoid the situation of backwashing the sewage pump 2.

[0038] Working principle:

[0039] In actual use, people can install the check valve body 1 on the sewage pump 2, so that when the check valve body 1 drains water, it can prevent the water from returning and flowing back, avoiding the situation of flushing the sewage pump 2 back. When the water is discharged by the sewage pump 2, it will enter the inside of the check valve body 1 through the water inlet 101. The entering water will impact the sealing piston 120, causing the sealing piston 120 to be forced to retract. When the sealing piston 120 is forced to retract into the fixed chamber 123, the opening 111 on the water outlet ring 112 will be exposed. At this time, the entering water will be discharged through the side opening 111 and further upward through the water passing port 105, and finally will be discharged to the drainage pipe through the water outlet 102, completing the drainage work of the sewage pump 2. When the sewage pump 2 stops working and no longer drains water, under the action of the restoring force of the return spring 106, the sealing piston 120 will be reset, causing the sealing piston 120 to fall and cooperate with the sealing ring 113 to close the internal passage of the check valve body 1, completing the check work. At the same time, under the action of the restoring force of the top spring 119, the fixing ring 121 can be pressed down through the top spring 119, and the guide post 126 can be driven to descend synchronously through the fixing ring 121. When the guide post 126 is driven to descend, the end of the guide post 126 will drive the rotating ring 128 to deflect through the guide groove 127, and the sealing plate 129 can be driven to deflect synchronously through the rotating ring 128, causing the water passing port 105 on the sealing plate 129 to be misaligned with the water passing port 105 on the fixed disk 108. At this time, the upper part inside the check valve body 1 can be closed by combining the fixed disk 108 and the sealing plate 129. The falling water can be directly intercepted at the upper part through the fixed disk 108 and the sealing plate 129, so as to cooperate with the sealing ring 113 to realize the double sealing of the inside of the check valve body 1, and thus can effectively complete the check and closing work, which is beneficial to actual use. During the process of closing the inside of the check valve body 1 by the fixed disk 108 and the sealing plate 129, the blocked water will enter the limit sleeve 124 through the flow collecting groove 107 at the top of the top cylinder 125, and then the water will enter the sliding sleeve 118. The impact and water pressure of the flowing-back water can further impact the sliding sleeve 118 and the sealing piston 120, accelerating the falling and resetting of the sealing piston 120, so as to reduce the amount of flowing-back water and reduce the damage to the sewage pump 2 caused by backflow. At the same time, the flowing-back water will continuously apply pressure to the sealing piston 120, so as to effectively improve the sealing effect between the sealing piston 120 and the sealing ring 113, avoiding the situation that the restoring sealing effect is not good due to insufficient elastic force of the return spring 106 after long-term use, and thus can greatly extend the service life of the check valve body 1. When the sewage pump 2 is working, when the sealing piston 120 is lifted, the guide post 126 will be driven to rise synchronously through the fixing ring 121. The rotating ring 128 can be driven to deflect through the guide groove 127 to drive the sealing plate 129 to rotate, so that the water passing port 105 on the sealing plate 129 can correspond to the water passing port 105 on the fixed disk 108.The opening of the internal passage of the check valve body 1 is realized, facilitating the drainage work. When the sealing plate 129 rotates, it will drive the magnetic ring 122 on the outer periphery to rotate synchronously. Through the magnetic ring 122, the rotating ring 115 can be magnetically attracted to rotate synchronously. When the rotating ring 115 rotates, it will drive the opening and closing joint 117 to deflect synchronously through the fixing rod 114 at the bottom, so that the end interface of the opening and closing joint 117 can connect and disconnect the two ends of the detection ring 109, realizing the opening and closing of the detection ring 109, and making the opening and closing of the detection ring 109 correspond to the opening and closing of the fixed disk 108 and the sealing plate 129. When the detection ring 109 is opened, it will transmit a working signal to people through the signal transmitter 110, indicating the working state inside the check valve body 1, realizing the real-time detection of the working state of the check valve body 1, which is beneficial to actual use.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A check valve structure, comprising a check valve body (1), characterized in that: The check valve body (1) comprises a central through section (103), one end of which is provided with a water inlet (101), and the other end of which is provided with a water outlet (102), a sealing ring (113) is installed at the lower part of the central through section (103), a sealing piston (120) is installed on the upper side of the middle part of the sealing ring (113), a sliding sleeve (118) is installed at the middle part of the top end of the sealing piston (120), the sliding sleeve (118) is slidably connected to a limiting sleeve (124) inside, a return spring (106) is arranged on the inner side of the limiting sleeve (124), a fixed bin (123) is arranged at the upper part of the sealing piston (120), a fixed frame (116) is fixedly connected to the middle part of the outer periphery of the fixed bin (123), the fixed frame (116) is fixedly connected to the middle part of the central through section (103), and the fixed bin (123) A top tube (125) is fixedly connected to the middle of the top end; the top of the limiting sleeve (124) is fixedly connected to the inner upper part of the top tube (125); a collecting groove (107) is provided at the middle of the top end of the top tube (125); an outer bin (104) is installed at the upper part of the outer periphery of the middle through section (103); a swivel (115) is rotatably connected to the inner upper part of the outer bin (104); a fixing rod (114) is fixedly connected to one side of the bottom of the swivel (115); a start-stop joint (117) is installed at the bottom of the fixing rod (114); a signal transmitter (110) is installed at the inner bottom of the outer bin (104); a detection ring (109) is installed at the top of the signal transmitter (110); an start-stop joint (117) is provided on the inner side of one end of the detection ring (109); a connection port is provided at the other end of the detection ring (109); the connection port corresponds to the end of the start-stop joint (117).

2. A check valve structure according to claim 1, characterized in that: A rotating ring (128) is rotatably connected to the middle of the outer circumference of the top cylinder (125), guide grooves (127) are provided on both sides of the outer circumference of the rotating ring (128), guide pillars (126) are slidably connected to the inner sides of the guide grooves (127), the bottoms of the guide pillars (126) pass through the top of the fixed bin (123), and the guide pillars (126) are slidably connected to the fixed bin (123).

3. A check valve structure according to claim 2, characterized in that: The bottom of the guide column (126) is fixedly connected to a fixing ring (121), the fixing ring (121) is installed on the top of the sealing piston (120), and top springs (119) are arranged on both sides of the upper part of the fixing ring (121), the top springs (119) are sleeved on the lower part of the outer periphery of the guide column (126), and the top springs (119) are arranged on the inner side of the fixing chamber (123).

4. A check valve structure according to claim 2, characterized in that: A sealing plate (129) is fixedly connected to the top of the rotating ring (128), a fixed disk (108) is arranged on the top of the sealing plate (129), the fixed disk (108) is fixedly connected to the upper part of the outer periphery of the top cylinder (125), and the fixed disk (108) and the sealing plate (129) are both arranged in the upper part of the middle through section (103).

5. A check valve structure according to claim 4, characterized in that: A magnetic ring (122) is embedded in the middle of the outer circumference of the sealing plate (129), the magnetic ring (122) corresponds to the rotating ring (115), and the sealing plate (129) and the magnetic ring (122) are both rotatably connected to the inner side of the middle through section (103).

6. A check valve structure according to claim 1, characterized in that: A water outlet ring (112) is installed on the top of the sealing ring (113), and evenly distributed openings (111) are provided in the middle of the water outlet ring (112). The water outlet ring (112) is slidably connected to the sealing piston (120), and the top of the opening (111) is installed at the lower part of the outer periphery of the fixed chamber (123).

7. A check valve structure according to claim 4, characterized in that: The fixed disk (108) and the sealing plate (129) are both provided with evenly distributed water openings (105) on the outer sides of the middle parts, and the water openings (105) on the fixed disk (108) and the sealing plate (129) correspond to each other.

8. A self-priming sewage pump, used in conjunction with a check valve structure according to any one of claims 1 to 7, comprising a sewage pump (2), characterized in that: The discharge outlet flange of the sewage pump (2) is connected to a check valve body (1).

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