Anti-backflow check valve assembly and operation method

Abstract

The present invention discloses an anti-backflow check valve assembly and an operation method, wherein the assembly comprises a valve body and an anti-backflow assembly, wherein the valve body has a first valve core cavity and a second valve core cavity inside, and the first valve core cavity and the second valve core cavity are connected to each other through a water passage; the anti-backflow assembly is arranged on the water passage; wherein the anti-backflow assembly comprises a mounting ring, an upper baffle plate and a lower baffle plate, the mounting ring is used to be mounted on the water passage, an annular baffle plate is arranged on the mounting ring, the upper baffle plate and the lower baffle plate are both rotatably arranged on the mounting ring, the upper baffle plate and the lower baffle plate are located on the side of the annular baffle plate close to the second valve core cavity, and the annular baffle plate is used to block the rotation direction of the upper baffle plate and the lower baffle plate toward the first valve core cavity side; a sealing groove is arranged on the upper baffle plate, and a sealing baffle plate is arranged on the upper baffle plate. The purpose of the present invention is to solve the problem that the check valve in the prior art cannot prevent liquid backflow when the internal spring fails.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and in particular to an anti-backflow check valve assembly and an operating method. Background Art

[0002] Traditional check valve designs use valve discs or valve plugs to automatically open and close under fluid pressure to prevent backflow of the medium. However, these designs often face challenges such as poor sealing, poor wear resistance, unstable operation, and complex installation and maintenance, prompting the industry to continuously explore new materials, new structures, and intelligent control technologies to improve the reliability, durability, and applicability of check valves to meet the fluid control needs under various harsh working conditions.

[0003] The utility model patent with application number: CN201620227559.2 and publication number: CN205446830U (hereinafter referred to as "prior art 1") discloses a shock-absorbing check valve core and a check valve using the check valve core, including a valve body with an air passage, a valve cover fixed on the valve body and a shock-absorbing check valve core for blocking the air passage, the lower end surface of the valve cover is a lower stop surface for stopping the valve core, the shock-absorbing check valve core includes an inverted T-shaped valve disc composed of two sections with a smaller diameter at the top and a larger diameter at the bottom, which is used to cooperate with the valve seat to seal and open and close the air inlet passage in the valve body, the connection between the upper and lower sections constitutes the upper shoulder of the valve disc, and the small section is used to contact with the lower end surface of the valve cover. The blind hole guide moves in cooperation, and the lower end face of the large section is used for sealing cooperation with the valve seat. The valve flap has a closed state in which it is tightly pressed against the valve seat to block the air inlet duct and an open state in which it is pushed upward so that the upper shoulder is blocked by the lower end face of the valve cover to open the air duct. The small section of the valve flap is provided with a shock-absorbing member located above the upper shoulder. The shock-absorbing member has an impact surface for hitting the lower end face of the valve cover and cooperating with the lower stop face of the valve cover when the valve flap is forced to open upward. The elastic member has elasticity so that the shock-absorbing member can absorb the vibration caused by the impact to achieve shock absorption. The shock-absorbing member is fixed on the small section or the shock-absorbing member is sleeved on the small section and has a lower end face for cooperating with the upper shoulder of the valve flap.

[0004] The specification of prior art 1 discloses a shock-absorbing check valve core and a check valve using the check valve core. In actual use, the check valve core is provided with an elastic shock-absorbing member located above the upper shoulder on the valve disc, and the direct contact between the valve disc and the valve cover is replaced by the direct contact between the shock-absorbing member and the valve cover. The elastic shock-absorbing member can effectively reduce the adverse vibration caused by the impact. However, in actual application, due to the impact of the water flow at the inlet end, when the spring is used for a period of time exceeding a threshold, the spring will fail and the normal operation of the check valve cannot be guaranteed. In addition, only the spring is used for buffering and the flow at the outlet end cannot be controlled. Summary of the invention

[0005] The invention provides an anti-backflow check valve assembly and an operating method, aiming to solve the problem that the check valve in the prior art cannot prevent liquid backflow when the internal spring fails.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A backflow prevention check valve assembly, comprising a valve body and a backflow prevention assembly, wherein the valve body has a first valve core cavity and a second valve core cavity inside, and the first valve core cavity and the second valve core cavity are connected to each other through a water passage; the backflow prevention assembly is arranged on the water passage;

[0008] Among them, the backflow prevention component includes a mounting ring, an upper baffle and a lower baffle. The mounting ring is used to be installed on the water flow channel. The mounting ring is provided with an annular baffle. The upper baffle and the lower baffle are both rotatably arranged on the mounting ring. The upper baffle and the lower baffle are located on the side of the annular baffle close to the second valve core cavity. The annular baffle is used to block the rotation direction of the upper baffle and the lower baffle toward the first valve core cavity. A sealing groove is provided on the upper baffle. A sealing baffle is provided on the upper baffle. The sealing baffle is used to contact with the sealing groove. When the sealing baffle contacts with the sealing groove, the upper baffle and the lower baffle are buckled and combined to close and seal the water flow channel.

[0009] Furthermore, the mounting ring includes a fixed ring and a rotating ring, the fixed ring is fixedly mounted on the inlet of the water passage, the rotating ring is threadedly connected to the fixed ring, the upper baffle is rotatably mounted on the fixed ring, and the lower baffle is rotatably mounted on the rotating ring.

[0010] Furthermore, the upper baffle plate and the lower baffle plate are both provided with two telescopic rods, and two ends of the telescopic rods are respectively hinged to the upper baffle plate and the lower baffle plate through a hinge part.

[0011] Furthermore, the telescopic rod includes a sleeve and a sliding rod, the sleeve is hinged on the lower baffle through the hinge part, the sliding rod is hinged on the upper baffle through the hinge part, a piston is arranged on the sliding rod, the piston is slidably connected with the sleeve, a limiting ring is arranged on the sleeve, and the limiting ring is used to limit the position of the piston.

[0012] Furthermore, the first valve core cavity has a first valve stem, a sealing plate, a sealing plug and a spring. The end of the first valve stem is a cross-shaped structure. The baffle of the cross-shaped structure divides the inlet end of the first valve core cavity into four water inlet areas. The sealing plate is fixedly mounted on the first valve stem and connected to the end of the cross-shaped structure. The first valve stem of the cross-shaped structure is slidingly connected to the first valve core cavity. The sealing plate is used to seal the inlet end of the first valve core cavity. The spring is sleeved on the first valve stem. The sealing plug is threadedly connected to the outlet end of the first valve core cavity. One end of the spring is connected to the sealing plug, and the other end is connected to the sealing plate.

[0013] Furthermore, a second valve stem is provided inside the second valve core cavity, and a sealing head is provided at the end of the second valve stem, which is used to seal the outlet end of the second valve core cavity, and the second valve stem is movably sealedly connected to the inlet end of the second valve core cavity.

[0014] Furthermore, the second valve stem includes a threaded sleeve and a threaded rod, the outer wall of the threaded sleeve is rotatably sealed and connected to the inlet end of the second valve core cavity, the threaded rod is threadedly connected to the threaded sleeve, the sealing head is installed at the end of the threaded rod, sliding protrusions are provided on both sides of the threaded rod, and a sliding recess is provided inside the second valve core cavity, and the sliding protrusion is slidably connected to the sliding recess.

[0015] Furthermore, a motor is arranged on the valve body, a fixed end of the motor is fixedly connected to the valve body, and a movable end of the motor is fixedly connected to the threaded sleeve.

[0016] Furthermore, flow rate sensors are provided on the upper baffle plate, the lower baffle plate and the outlet end of the second valve core cavity, and the flow rate sensors are used to monitor the flow rate and flow rate of water entering the second valve core cavity from the water passage.

[0017] A method for operating an anti-backflow check valve assembly comprises the following steps:

[0018] Experiment on the linear relationship between the number of motor revolutions and the flow rate of water at the outlet of the second valve core chamber:

[0019] S101: Control the motor to rotate one circle. After the motor rotates one circle, the threaded rod drives the sealing head to rise, and the rising height is H1;

[0020] S102: measuring the flow rate of water by a flow rate sensor;

[0021] S103: Control the motor to rotate two circles. After the motor rotates one circle, the threaded rod drives the sealing head to rise, and the rising height is H2;

[0022] S104: measuring the flow rate of water by a flow rate sensor;

[0023] S105: increasing the number of revolutions of the motor until the screw cannot be lifted any further, and detecting the flow rate of the water each time;

[0024] S106: After detecting the data and recording them in a table, a linear relationship k between the number of motor rotations and the flow rate of water at the outlet of the second valve core cavity is obtained;

[0025] Match the number of motor revolutions with the height of the second valve stem rise:

[0026] S201: First, define the quantity symbolically:

[0027] n: the number of revolutions of the motor;

[0028] h: the height of the second valve stem rising;

[0029] p: pitch of the thread;

[0030] S201: Calculate the number of revolutions n of the motor by using the formula h=p·n;

[0031] Matching flow rate to stem movement:

[0032] S301: From S101 to S106, it is known that the rising height h of the second valve stem is proportional to the flow rate Q, so the formula is derived:

[0033] h=k·Q

[0034] Match the relationship between flow rate and flow velocity:

[0035] First, the relationship between flow rate Q and flow velocity v can be expressed by the following formula:

[0036] Q=A·v

[0037] A is the cross-sectional area of ​​the water outlet, v is the water flow rate. Since the flow rate Q is a controlled quantity, the water flow rate v can be calculated by the cross-sectional area A of the water outlet;

[0038] The cross-sectional area of ​​the outlet is then calculated using the inner diameter d of the outlet, where d is measured using a vernier caliper:

[0039]

[0040] S401: The above formulas are synthesized to derive the final formula for the number of motor rotations n:

[0041]

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention mainly includes a valve body and an anti-backflow component. In actual use, the staff flows water into the valve body, and the water flows from the first valve core cavity through the water passage and the anti-backflow component into the second valve core cavity. In this process, the water flow is first buffered in the first valve core cavity, and the buffered water flow impacts the upper baffle plate and the lower baffle plate. The upper baffle plate and the lower baffle plate are opened after being impacted by the water flow, and the water flow immediately enters the second valve core cavity, and finally is discharged from the water outlet end of the second valve core cavity. Since the annular baffle plate is provided, when the water in the second valve core cavity backflows, the second valve core cavity impacts the upper baffle plate and the lower baffle plate, and the annular baffle plate blocks the upper baffle plate and the lower baffle plate, so that the upper baffle plate and the lower baffle plate cannot be opened in the reverse direction, and the sealing groove on the upper baffle plate and the sealing baffle plate on the lower baffle plate cooperate with each other. When the water flow impacts the upper baffle plate and the lower baffle plate, the contact between the sealing groove and the sealing baffle plate is made tighter, thereby making the sealing effect between the upper baffle plate and the lower baffle plate better. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a structural schematic diagram of the present invention.

[0046] Figure 2 It is a cross-sectional view of the present invention.

[0047] Figure 3 This is one of the structural schematic diagrams of the anti-backflow component in the present invention.

[0048] Figure 4 This is the second structural schematic diagram of the backflow prevention component in the present invention.

[0049] Figure 5 For the present invention Figure 4 A partial enlarged view of point A in the middle.

[0050] Figure 6 It is a cross-sectional view of the backflow prevention component in the present invention.

[0051] Figure 7 For the present invention Figure 6 Usage status diagram of the anti-backflow component.

[0052] Figure 8 It is a partial cross-sectional view of the telescopic rod of the present invention.

[0053] Fig. 9It is a linear relationship diagram between the number of motor rotations and the flow rate of water at the outlet end of the second valve core cavity in the present invention.

[0054] Fig.10 It is a schematic diagram of the connection relationship between the positioning rod and the positioning hole of the present invention.

[0055] Fig.11 For the present invention Fig.10 A partial enlarged view of point B in the middle.

[0056] In the figure, 101-valve body, 102-first valve core cavity, 103-second valve core cavity, 104-water passage, 105-installation ring, 106-upper baffle, 107-lower baffle, 108-annular baffle, 109-sealing groove, 110-sealing baffle, 111-fixing ring, 112-rotating ring, 113-telescopic rod, 114-sleeve, 115-sliding rod, 116-limiting ring, 117-piston, 118-first Valve stem, 119-sealing plate, 120-sealing plug, 121-spring, 122-water entry area, 123-second valve stem, 124-sealing head, 125-threaded sleeve, 126-threaded rod, 127-sliding protrusion, 128-sliding depression, 129-motor, 130-positioning rod, 131-positioning hole, 132-annular depression, 133-sliding hole, 134-sliding rod, 135-tension spring, 136-rubber pad. DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with embodiments, which are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0058] See also Figure 1-Figure 9 As shown, this embodiment discloses an anti-backflow check valve assembly, including a valve body 101 and an anti-backflow assembly, wherein the valve body 101 has a first valve core cavity 102 and a second valve core cavity 103 inside, and the first valve core cavity 102 and the second valve core cavity 103 are interconnected through a water passage 104; the anti-backflow assembly is arranged on the water passage 104;

[0059] Among them, the backflow prevention component includes a mounting ring 105, an upper baffle 106 and a lower baffle 107. The mounting ring 105 is used to be installed on the water passage 104. An annular baffle 108 is arranged on the mounting ring 105. The upper baffle 106 and the lower baffle 107 are both rotatably arranged on the mounting ring 105. The upper baffle 106 and the lower baffle 107 are located on the side of the annular baffle 108 close to the second valve core chamber 103. The annular baffle 108 is used to block the rotation direction of the upper baffle 106 and the lower baffle 107 toward the first valve core chamber 102. A sealing groove 109 is provided on the upper baffle 106. A sealing baffle 110 is provided on the upper baffle 106. The sealing baffle 110 is used to contact with the sealing groove 109. When the sealing baffle 110 contacts with the sealing groove 109, the upper baffle 106 and the lower baffle 107 are buckled and the water passage 104 is closed and sealed.

[0060] The present invention mainly includes a valve body 101 and an anti-backflow component. In actual use, the staff flows water into the valve body 101, and the water flows from the first valve core chamber 102 through the water passage 104 and the anti-backflow component into the second valve core chamber 103. In this process, the water flow is first buffered in the first valve core chamber 102, and the buffered water flow impacts the upper baffle plate 106 and the lower baffle plate 107. The upper baffle plate 106 and the lower baffle plate 107 are opened after being impacted by the water flow, and the water flow immediately enters the second valve core chamber 103, and is finally discharged from the water outlet end of the second valve core chamber 103. Since the annular baffle plate 108 is provided, Therefore, when the water inside the second valve core chamber 103 flows back, the second valve core chamber 103 impacts the upper baffle plate 106 and the lower baffle plate 107, and the annular baffle plate 108 blocks the upper baffle plate 106 and the lower baffle plate 107, so that the upper baffle plate 106 and the lower baffle plate 107 cannot be opened in the reverse direction, and the sealing groove 109 on the upper baffle plate 106 and the sealing baffle plate 110 on the lower baffle plate 107 cooperate with each other. When the water flow impacts the upper baffle plate 106 and the lower baffle plate 107, the contact between the sealing groove 109 and the sealing baffle plate 110 is closer, thereby making the sealing effect between the upper baffle plate 106 and the lower baffle plate 107 better.

[0061] In some embodiments, the upper baffle plate 106 and the lower baffle plate 107 are used for opening and closing, and the impact force of the water flow can be shared respectively, so that the water passage 104 can be opened faster.

[0062] In some embodiments, the mounting ring 105 includes a fixed ring 111 and a rotating ring 112. The fixed ring 111 is fixedly mounted on the entrance of the water passage 104. The rotating ring 112 is threadedly connected to the fixed ring 111. The upper baffle 106 is rotatably mounted on the fixed ring 111. The lower baffle 107 is rotatably mounted on the rotating ring 112.

[0063] During actual use, the staff found that the mounting ring 105 was not convenient to install and disassemble. Therefore, in order to facilitate the installation of the mounting ring 105 as a whole, the mounting ring 105 is composed of two parts, namely a fixed ring 111 and a rotating ring 112. When installing, first rotate the rotating ring 112 so that the rotating ring 112 and the fixed ring 111 are threadedly matched, and then the upper baffle 106 and the lower baffle 107 are installed on the fixed ring 111. The rotating ring 112 fixes the positions of the upper baffle 106 and the lower baffle 107, so that the matching relationship between the upper baffle 106, the lower baffle 107 and the fixed ring 111 is more stable.

[0064] In some embodiments, the upper baffle 106 and the lower baffle 107 are both provided with two telescopic rods 113 , and the two ends of the telescopic rods 113 are respectively hinged to the upper baffle 106 and the lower baffle 107 through a hinge portion.

[0065] During actual use, the main purpose of the telescopic rod 113 is to guide the opening of the upper baffle 106 and the lower baffle 107, so that the opening and closing actions of the upper baffle 106 and the lower baffle 107 are more stable, thereby making the sealing groove 109 on the upper baffle 106 and the sealing baffle 110 on the lower baffle 107 better aligned.

[0066] In some embodiments, the telescopic rod 113 includes a sleeve 114 and a sliding rod 115. The sleeve 114 is hinged to the lower baffle 107 through the hinge portion, and the sliding rod 115 is hinged to the upper baffle 106 through the hinge portion. A piston 117 is provided on the sliding rod 115, and the piston 117 is slidably connected to the sleeve 114. A limiting ring 116 is provided on the sleeve 114, and the limiting ring 116 is used to limit the position of the piston 117.

[0067] In actual use, the main purpose of providing the piston 117 is to prevent water from entering the sleeve 114 and causing the telescopic rod 113 to fail.

[0068] In some embodiments, the first valve core cavity 102 has a first valve stem 118, a sealing plate 119, a sealing plug 120 and a spring 121. The end of the first valve stem 118 is a cross-shaped structure. The baffle of the cross-shaped structure divides the inlet end of the first valve core cavity 102 into four water inlet areas 122. The sealing plate 119 is fixedly installed on the first valve stem 118 and is connected to the end of the cross-shaped structure. The first valve stem 118 with the cross-shaped structure is slidingly connected to the first valve core cavity 102. The sealing plate 119 is used to block the inlet end of the first valve core cavity 102. The spring 121 is sleeved on the first valve stem 118. The sealing plug 120 is threadedly connected to the outlet end of the first valve core cavity 102. One end of the spring 121 is connected to the sealing plug 120, and the other end is connected to the sealing plate 119.

[0069] During actual use, when water flows into the first valve core cavity 102, the water flows first through the water inlet area 122 around the first valve stem 118 of the cross star structure, and the impact force of the water flow acts on the sealing plate 119, pushing the first valve stem 118 to connect the sealing plate 119 to slide as a whole inside the first valve core cavity 102, and the sealing plate 119 opens, and the first valve core cavity 102 is connected to the outside. At this time, the first valve stem 118 compresses the spring 121, and the spring 121 buffers the first valve stem 118. When the water flow stops inputting, the reaction force of the spring 121 pushes the sealing plate 119 to block the first valve core cavity 102.

[0070] In some embodiments, the second valve core chamber 103 has a second valve stem 123 inside, and a sealing head 124 is provided at the end of the second valve stem 123. The sealing head 124 is used to seal the outlet end of the second valve core chamber 103. The second valve stem 123 is movably sealed and connected to the inlet end of the second valve core chamber 103.

[0071] During actual use, the staff lifts the second valve stem 123 to open the outlet end of the second valve core chamber 103. As the second valve stem 123 is lifted, the flow rate of water at the outlet end of the second valve core chamber 103 can be increased, thereby achieving the purpose of controlling the flow rate of water at the outlet end of the second valve core chamber 103 through the second valve stem 123.

[0072] In some embodiments, the second valve stem 123 includes a threaded sleeve 125 and a threaded rod 126. The outer wall of the threaded sleeve 125 is rotatably sealed and connected to the inlet end of the second valve core chamber 103. The threaded rod 126 is threadedly connected to the threaded sleeve 125. The sealing head 124 is installed at the end of the threaded rod 126. Sliding protrusions 127 are provided on both sides of the threaded rod 126. A sliding recess 128 is provided inside the second valve core chamber 103. The sliding protrusion 127 is slidably connected to the sliding recess 128.

[0073] During actual use, when the second valve stem 123 is lifted, the threaded sleeve 125 is rotated, and the threaded sleeve 125 rotates inside the second valve core chamber 103 at the same height. Under the action of the threaded sleeve 125, the threaded rod 126 is radially limited by the sliding protrusion 127 and the sliding recess 128, and then rises or falls inside the second valve core chamber 103.

[0074] In some embodiments, a motor 129 is disposed on the valve body 101 , a fixed end of the motor 129 is fixedly connected to the valve body 101 , and a movable end of the motor 129 is fixedly connected to the threaded sleeve 125 .

[0075] In actual use, in order to facilitate the overall lifting of the second valve stem 123, the staff controls the motor 129 to rotate. After the motor 129 rotates, it drives the threaded sleeve 125 to rotate, and then drives the threaded rod 126 to be lifted.

[0076] In some embodiments, flow rate sensors are provided on the upper baffle plate 106 , the lower baffle plate 107 and the outlet end of the second valve core chamber 103 , and the flow rate sensors are used to detect the flow rate and flow of water entering the second valve core chamber 103 from the water passage 104 .

[0077] During actual use, the flow rate sensor is used to detect the flow rate of water passing through the upper baffle 106 and the lower baffle 107. The flow rate sensor at the outlet of the second valve core chamber 103 is mainly used to conduct experiments on the linear relationship between the number of rotations of the motor 129 and the flow rate of water at the outlet of the second valve core chamber 103.

[0078] A method for operating an anti-backflow check valve assembly comprises the following steps:

[0079] The linear relationship between the number of revolutions of the motor 129 and the flow rate of water at the outlet of the second valve core chamber 103 was tested:

[0080] S101: Control the motor 129 to rotate one circle. After the motor 129 rotates one circle, the threaded rod 126 drives the sealing head 124 to rise, and the rising height is H1;

[0081] S102: measuring the flow rate of water by a flow rate sensor;

[0082] S103: Control the motor 129 to rotate two circles. After the motor 129 rotates one circle, the threaded rod 126 drives the sealing head 124 to rise, and the rising height is H2;

[0083] S104: measuring the flow rate of water by a flow rate sensor;

[0084] S105: increasing the number of revolutions of the motor 129 until the screw cannot be lifted any further, and detecting the flow rate of the water each time;

[0085] S106: After detecting the data and recording them in a table, a linear relationship k between the number of revolutions of the motor 129 and the flow rate of water at the outlet of the second valve core chamber 103 is obtained;

[0086] The number of revolutions of the motor 129 is matched with the rising height of the second valve stem 123:

[0087] S201: First, define the quantity symbolically:

[0088] n: the number of revolutions of the motor 129;

[0089] h: the height of the second valve stem 123 rising;

[0090] p: pitch of the thread;

[0091] S201: Calculate the number of revolutions n of the motor by using the formula h=p·n;

[0092] Matching flow rate to stem movement:

[0093] S301: It is known from S101 to S106 that the rising height h of the second valve stem 123 is proportional to the flow rate Q, so the formula is derived:

[0094] h=k·Q

[0095] Match the relationship between flow rate and flow velocity:

[0096] First, the relationship between flow rate Q and flow velocity v can be expressed by the following formula:

[0097] Q=A·v

[0098] A is the cross-sectional area of ​​the water outlet, v is the water flow rate. Since the flow rate Q is a controlled quantity, the water flow rate v can be calculated by the cross-sectional area A of the water outlet;

[0099] The cross-sectional area of ​​the outlet is then calculated using the inner diameter d of the outlet, where d is measured using a vernier caliper:

[0100]

[0101] S401: The above formulas are synthesized to derive the final formula for the number of motor rotations n:

[0102]

[0103] In actual use, firstly, the linear relationship between the number of revolutions of the motor 129 and the flow rate of water at the outlet of the second valve core chamber 103 should be tested;

[0104] As an optional implementation, during the experiment, the motor 129 is controlled to rotate 1 circle. After the motor 129 rotates N=1 circle, the threaded rod 126 drives the sealing head 124 to rise, and the flow rate Q at the outlet of the second valve core chamber 103 is Q=0.5L / s. After the motor 129 rotates N=2 circles, the threaded rod 126 drives the sealing head 124 to rise, and the flow rate Q at the outlet of the second valve core chamber 103 is Q=1.02L / s. After the motor 129 rotates N=3 circles, the threaded rod 126 drives the sealing head 124 to rise, and the flow rate Q at the outlet of the second valve core chamber 103 is Q=1.51L / s. The above Q and N data are recorded.

[0105] The recorded form is as follows:

[0106] Motor rotation number (N) Export flow (Q) 0 0.00 1 0.50 2 1.02 3 1.51 …… ……

[0107] like Fig. 9 As shown, a linear regression line is drawn according to the above table, a linear regression equation is obtained, and finally K=0.51 is determined;

[0108] As an optional implementation, in this embodiment, since the flow rate Q at the outlet of the second valve core chamber 103 is fixed, when the flow rate Q at the outlet of the second valve core chamber 103 is 5.1L / s, a vernier caliper is used to measure the caliber of the outlet of the second valve core chamber 103, and the outlet diameter d is measured to be 155mm. According to the above formula, the cross-sectional area of ​​the outlet is converted to A=189cm 2 , the flow velocity v at the outlet of the second valve core chamber 103 is converted to 27 cm / s; the threaded sleeve 125 actually used is a φ22 cm straight threaded sleeve 125 in the prior art, and its pitch Q is 25 mm;

[0109] After substituting into the formula, we get =1039. Therefore, when the flow rate at the outlet of the second valve core chamber 103 is required to reach 5.1 L / s, the motor 129 needs to rotate 1039 times to accurately control the flow rate at the outlet of the second valve core chamber 103 to 5.1 L / s.

[0110] like Fig.10 as well as Fig.11 As shown, as an optional implementation, in this embodiment, a positioning rod 130 is arranged above the sealing plate 119, a positioning hole 131 is arranged on the inner wall of the first valve core cavity 102, and the positioning rod 130 is used to be placed in the positioning hole 131, and an annular recess 132 is arranged on the inner wall of the positioning hole 131, and a sliding hole 133 is arranged on the inner wall of the annular recess 132, and a sliding rod 134 is slidably arranged on the sliding hole 133, and a tension spring 135 is also arranged inside the sliding hole 133, one end of the tension spring 135 is connected to the sliding hole 133, and the other end is connected to the end of the sliding rod 134, and a rubber pad 136 is arranged at the end of the sliding rod 134, and the rubber pad 136 is used to fit tightly with the inner wall of the annular recess 132 and the outer wall of the positioning rod 130;

[0111] In actual use, in order to ensure the backflow of liquid in the first valve core chamber 102, it is necessary to further improve the sealing between the sealing plate 119 and the first valve core chamber 102. During use, when there is no water flowing through the inlet end of the first valve core chamber 102, the positioning rod 130 on the sealing plate 119 is inserted into the positioning hole 131. During this process, the tension spring 135 always pulls the rubber pad 136 so that the rubber pad 136 fits tightly with the position of the annular recess 132. When the positioning rod 130 is inserted into the positioning hole 131, the outer wall of the positioning rod 130 squeezes the rubber pad 136, so that the sealing effect of the rubber pad 136 is better, and at the same time, the residual liquid in the first valve core chamber 119 is prevented from flowing back from the water outlet of the first valve core chamber 119.

[0112] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0113] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0114] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0115] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention check valve assembly, characterized in that: include: A valve body (101), wherein the valve body (101) has a first valve core cavity (102) and a second valve core cavity (103) inside, and the first valve core cavity (102) and the second valve core cavity (103) are connected to each other via a water passage (104); an anti-backflow component, the anti-backflow component being arranged on the water passage (104); The backflow prevention component comprises a mounting ring (105), an upper baffle plate (106) and a lower baffle plate (107); the mounting ring (105) is used to be mounted on the water passage (104); an annular baffle plate (108) is arranged on the mounting ring (105); the upper baffle plate (106) and the lower baffle plate (107) are both rotatably arranged on the mounting ring (105); the upper baffle plate (106) and the lower baffle plate (107) are located on one side of the annular baffle plate (108) close to the second valve core chamber (103); the annular baffle plate (108) The invention is used to block the rotation direction of the upper baffle plate (106) and the lower baffle plate (107) toward the first valve core chamber (102); a sealing groove (109) is provided on the upper baffle plate (106); a sealing baffle plate (110) is provided on the upper baffle plate (106); the sealing baffle plate (110) is used to contact the sealing groove (109); when the sealing baffle plate (110) contacts the sealing groove (109), the upper baffle plate (106) and the lower baffle plate (107) are buckled and the water passage (104) is closed and sealed.

2. The anti-backflow check valve assembly according to claim 1, characterized in that: The mounting ring (105) comprises a fixed ring (111) and a rotating ring (112), wherein the fixed ring (111) is fixedly mounted on the entrance of the water passage (104), the rotating ring (112) is threadedly connected to the fixed ring (111), the upper baffle (106) is rotatably mounted on the fixed ring (111), and the lower baffle (107) is rotatably mounted on the rotating ring (112).

3. The anti-backflow check valve assembly according to claim 1, characterized in that: The upper baffle (106) and the lower baffle (107) are both provided with two telescopic rods (113), and the two ends of the telescopic rods (113) are respectively hinged to the upper baffle (106) and the lower baffle (107) through a hinged portion.

4. The anti-backflow check valve assembly according to claim 3, characterized in that: The telescopic rod (113) comprises a sleeve (114) and a sliding rod (115); the sleeve (114) is hinged to the lower baffle (107) through the hinge portion; the sliding rod (115) is hinged to the upper baffle (106) through the hinge portion; a piston (117) is arranged on the sliding rod (115); the piston (117) is slidably connected to the sleeve (114); a limiting ring (116) is arranged on the sleeve (114); the limiting ring (116) is used to limit the position of the piston (117).

5. The anti-backflow check valve assembly according to claim 1, characterized in that: The first valve core cavity (102) has a first valve stem (118), a sealing plate (119), a sealing plug (120) and a spring (121) inside. The end of the first valve stem (118) is a cross-shaped structure. The baffle of the cross-shaped structure divides the inlet end of the first valve core cavity (102) into four water inlet areas (122). The sealing plate (119) is fixedly installed on the first valve stem (118) and connected to the end of the cross-shaped structure. The first valve stem (118) of the cross-shaped structure is slidably connected to the first valve core cavity (102). The sealing plate (119) is used to block the inlet end of the first valve core cavity (102). The spring (121) is sleeved on the first valve stem (118). The sealing plug (120) is threadedly connected to the outlet end of the first valve core cavity (102). One end of the spring (121) is connected to the sealing plug (120), and the other end is connected to the sealing plate (119).

6. The anti-backflow check valve assembly according to claim 1, characterized in that: The second valve core cavity (103) has a second valve stem (123) inside, and a sealing head (124) is provided at the end of the second valve stem (123). The sealing head (124) is used to seal the outlet end of the second valve core cavity (103). The second valve stem (123) is movably sealedly connected to the inlet end of the second valve core cavity (103).

7. The anti-backflow check valve assembly according to claim 6, characterized in that: The second valve stem (123) includes a threaded sleeve (125) and a threaded rod (126). The outer wall of the threaded sleeve (125) is rotatably sealed and connected to the inlet end of the second valve core chamber (103). The threaded rod (126) is threadedly connected to the threaded sleeve (125). The sealing head (124) is installed at the end of the threaded rod (126). Sliding protrusions (127) are provided on both sides of the threaded rod (126). A sliding recess (128) is provided inside the second valve core chamber (103). The sliding protrusion (127) is slidably connected to the sliding recess (128).

8. The anti-backflow check valve assembly according to claim 7, characterized in that: A motor (129) is disposed on the valve body (101), a fixed end of the motor (129) is fixedly connected to the valve body (101), and a movable end of the motor (129) is fixedly connected to the threaded sleeve (125).

9. The anti-backflow check valve assembly according to claim 1, characterized in that: Flow rate sensors are provided on the upper baffle plate (106), the lower baffle plate (107) and the outlet end of the second valve core chamber (103). The flow rate sensors are used to detect the flow rate and flow rate of water entering the second valve core chamber (103) from the water passage (104).

10. A method for operating an anti-backflow check valve assembly, comprising using an anti-backflow check valve assembly as claimed in claims 1 to 9, characterized in that: The steps include: An experiment was conducted on the linear relationship between the number of revolutions of the motor (129) and the flow rate of water at the outlet of the second valve core chamber (103): S101: Control the motor (129) to rotate one circle. After the motor (129) rotates one circle, the threaded rod (126) drives the sealing head (124) to rise, and the rising height is H1; S102: measuring the flow rate of water by a flow rate sensor; S103: Control the motor (129) to rotate two circles. After the motor (129) rotates one circle, the threaded rod (126) drives the sealing head (124) to rise, and the rising height is H2; S104: measuring the flow rate of water by a flow rate sensor; S105: increasing the number of revolutions of the motor (129) until the screw cannot be lifted any further, and detecting the flow rate of the water each time; S106: After detecting the data and recording them in a table, a linear relationship k between the number of revolutions of the motor (129) and the flow rate of water at the outlet of the second valve core chamber (103) is obtained; The number of revolutions of the motor (129) and the height of the second valve stem (123) are matched: S201: First, define the variables symbolically: n: the number of revolutions of the motor (129); h: the height of the second valve stem (123) rising; p: pitch of the thread; S201: Calculate the number of revolutions n of the motor (129) by using a formula; Matching flow rate to stem movement: S301: From S101 to S106, it is known that the rising height h of the second valve stem (123) is proportional to the flow rate Q, so the formula is derived: h = k·Q Match the relationship between flow rate and flow velocity: First, the relationship between flow rate Q and flow velocity v can be expressed by the following formula: Q=A·v A is the cross-sectional area of ​​the water outlet, v is the water flow rate. Since the flow rate Q is a controlled quantity, the water flow rate v can be calculated by the cross-sectional area A of the water outlet; The cross-sectional area of ​​the outlet is then calculated using the inner diameter d of the outlet, where d is measured using a vernier caliper: S401: The above formulas are synthesized to derive the final formula for the number of motor rotations n:

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