Sanitary double seat double seal mix-proof valve

Abstract

This invention discloses a sanitary double-seat double-seal anti-mixing valve, relating to the field of anti-mixing valve technology. It includes an integrally cast upper valve seat and a lower valve seat, a connecting channel linking the upper and lower valve seats, and a power assembly connected to the top of the upper valve seat. It also includes an upper valve core assembly, a lower valve core assembly, and an adjusting assembly. Firstly, when the adjusting assembly is in a first position, it seals the lower valve seat. Secondly, when the adjusting assembly is in a second position, it releases the seal on the lower valve seat. At this time, the first elastic seal contracts and no longer expands, reducing friction between the first elastic seal and the connecting channel, ensuring the seal safely crosses the metal edge in a low-friction state, thereby significantly improving the service life of the seal and the sanitary reliability of the valve operation. Thirdly, when the adjusting assembly is in a third position, it enhances the seal on the upper valve seat.

Description

Technical Field

[0001] This invention relates to the field of anti-mixing valve technology, and in particular to a sanitary double-seat double-seal anti-mixing valve. Background Technology

[0002] In the fields of fluid control and sanitary piping networks, double-seat, double-seal anti-mixing valves are core process equipment for achieving safe isolation and switching of different media (such as cleaning fluid and materials) in cross-pipelines within the same valve body. This equipment typically utilizes a cylinder to drive a long-shaft valve stem, which in turn drives independent upper and lower valve cores to perform opening, closing, or micro-opening cleaning actions. Through high-frequency fluid cutoff and connection, a piping network node with both isolation and cleaning functions is created. However, in pursuing high-frequency, fault-free switching, long-life operation, and stringent structural standards, anti-mixing valves still face significant technical challenges in terms of guiding accuracy during long-stroke movements, fatigue resistance and anti-wear properties of the main sealing ring, and uniformity of the dynamic flow field during micro-opening.

[0003] Chinese Patent Application No. 2009102653459 discloses a four-way anti-mixing double-seat valve, including a cylinder, an upper piston, a first biasing pressure component for resetting the upper piston, a valve body located at the lower part of the cylinder, and a shaft connecting the upper piston. The other end of the shaft extends through the bottom of the cylinder and into the valve body. It also includes an upper valve core and a lower valve core. A sleeve is provided in the cylinder body below the upper piston and is sleeved with the shaft core. A lower piston is provided outside the sleeve below the second power medium inlet and outlet. A third power medium inlet and outlet is provided on the cylinder body below the lower piston. The lower end of the sleeve extends through the bottom of the cylinder and into the valve body and connects with the upper valve core. The shaft core passes through the upper valve core and connects with the lower valve core. This provides a four-way anti-mixing double-seat valve that can seal the medium flowing in one flow channel while cleaning the other flow channel and the valve body to replace the flowing medium.

[0004] In the aforementioned patent, under harsh operating conditions such as thousands of opening and closing cycles, the sealing ring of the valve core is prone to wear. High-pressure fluid will force the elastic sealing ring, which expands under pressure, into the tiny fitting gap, directly causing fluid leakage and cross-contamination.

[0005] Therefore, it is necessary to invent a sanitary double-seat double-seal anti-mixing valve to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a sanitary double-seat double-seal anti-mixing valve to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sanitary double-seat double-seal anti-mixing valve, comprising an integrally cast upper valve seat and a lower valve seat, a connecting channel connecting the upper valve seat and the lower valve seat, and a power assembly connected to the top of the upper valve seat, and further comprising an upper valve core assembly, which is disposed in the upper valve seat and used to seal the upper valve seat. The lower valve core assembly is disposed within the connecting channel and is used to seal the lower valve seat; The power assembly is connected to the upper valve core assembly and the lower valve core assembly, and can drive the upper valve core assembly or the lower valve core assembly or both to move up and down synchronously. The regulating component has multiple positions and is positioned between the upper valve core assembly and the lower valve core assembly. When it is in the first position, it compresses the lower valve core assembly to seal the lower valve seat. When it is in the second position, it releases the compression of the lower valve core assembly and releases the seal on the lower valve seat. When it is in the third position, it compresses the upper valve core assembly to enhance the seal on the upper valve seat.

[0008] Preferably, the lower valve core assembly includes a lower valve stem that slides through the upper valve core assembly and extends to the top of the power assembly, with a drain channel provided inside the end of the lower valve core assembly away from the upper valve core assembly; The lower valve disc is located on the peripheral side wall of the lower valve stem and within the connecting channel. A guide groove is provided on its top, which is connected to the drain channel through a connecting hole. An annular groove is provided on the outer side wall of its top, and an elastic retaining spring is snapped into the side wall of the annular groove. The first elastic seal is fitted inside the annular groove; The extrusion component is slidably sleeved outside the annular groove and located between the first elastic seal and the elastic snap ring.

[0009] Preferably, the adjusting component includes a receiving groove, which is opened at the top of the lower valve stem and extends to the connecting channel. A limiting slide groove is symmetrically opened on its bottom side wall. An elastic reset member, a slider, and a rotating rod are arranged in sequence from bottom to top inside the component. The top of the rotating rod extends to the top of the lower valve stem, and the top side wall of the rotating rod is threadedly connected to the top of the receiving groove. The rotating rod is driven to rotate by a drive motor. The pressure plate is located between the extrusion part and the upper valve core assembly; The threaded rod has one end that passes through the pressure plate and the limiting groove and is threaded to the side wall of the slider.

[0010] Preferably, the upper valve core assembly includes an upper valve stem that is sealed and slidably sleeved outside the lower valve stem, with its top extending into the power assembly and being connected to the power assembly in a transmission manner, and its bottom extending into the upper valve seat; The upper valve disc has its top threadedly connected to the middle of the upper valve stem, and its bottom extends into the upper valve seat. A clamping member is threadedly connected to the inner wall of its bottom, and a second elastic seal is clamped between the upper valve disc and the clamping member.

[0011] Preferably, the power assembly includes a power chamber with an internal cavity, wherein a limiting boss is provided on the lower inner wall, and the inner cavity is provided with a first retaining ring, a first piston, an elastic reset component, a second piston, a second retaining ring and a third piston from top to bottom, wherein the third piston is located in the cavity below the limiting boss, and the first retaining ring and the second retaining ring are both engaged with the outer wall of the lower valve stem. A limiting ring is positioned between the first and second pistons and is engaged with the outer wall of the lower valve stem.

[0012] Preferably, it also includes a first air nozzle, which is located on the top of the power compartment and communicates with the cavity inside the power compartment; The second air nozzle is located at the bottom of the power compartment and is connected to the cavity inside the power compartment. The third air nozzle is located on the side wall of the power compartment and at a position corresponding to the limiting boss, and it is connected to the cavity inside the power compartment. A vent valve is located on the side wall of the power compartment between the first and second pistons.

[0013] Preferably, the power compartment includes a casing, the side wall of which is provided with a docking hole for connecting with the third air nozzle and the vent valve; The bin cover is sealed to the top of the bin, and the top has an interface for connecting with the first air nozzle. The base of the silo has a docking hole on its side wall for connecting with the second air nozzle. It is sealed to the bottom of the silo and has an adapter flange at its bottom. The upper valve seat has an upper connecting flange on its top. The upper connecting flange and the adapter flange are connected by a quick-release clamp.

[0014] Preferably, the lower valve seat is provided with a lower connecting flange at the bottom, and the lower connecting flange is provided with a sealing element that is slidably fitted with the bottom of the lower valve stem. The lower connecting flange and the sealing element are connected by a quick-release clamp.

[0015] Preferably, the upper valve stem is sealed and slidably sleeved inside the third piston, the top side wall of the upper valve stem is provided with a limiting platform larger than the inner diameter of the third piston, and a reset elastic element is provided between the top of the upper valve stem and the third piston.

[0016] Preferably, the bottom of the upper valve disc is provided with a receiving groove, the bottom outer wall of the clamping member is inclined, and a trapezoidal receiving cavity is formed between the bottom inclined surface of the clamping member and the receiving groove, and the second elastic sealing member is located in the trapezoidal receiving cavity.

[0017] The technical effects and advantages of this invention are as follows: The present invention achieves sealing of the lower valve seat by cooperating with the upper valve core assembly, the lower valve core assembly, and the adjusting assembly. When the adjusting assembly is in the first position, it squeezes the lower valve core assembly.

[0018] The present invention adjusts the valve core assembly, the lower valve core assembly and the adjusting assembly to a position lower than the first position through the cooperation between them, thereby further squeezing the first elastic seal and causing the first elastic seal to expand further to enhance the seal on the connecting channel.

[0019] This invention utilizes the cooperation between the upper valve core assembly, the lower valve core assembly, and the adjusting assembly. When the adjusting assembly is in the second position, it releases the pressure on the lower valve core assembly and releases the seal on the lower valve seat. At this time, the first elastic seal contracts and no longer expands, reducing the friction between the first elastic seal and the connecting channel. This ensures that the seal safely crosses the metal edge in a low-friction state, thereby significantly improving the service life of the seal and the hygienic reliability of valve operation.

[0020] The present invention enhances the sealing of the upper valve seat by cooperating with the upper valve core assembly, the lower valve core assembly, and the adjusting assembly. When the adjusting assembly is in the third position, it squeezes the upper valve core assembly.

[0021] This invention utilizes the cooperation between the upper valve core assembly, the lower valve core assembly, and the adjusting assembly. When the upper and lower valve seats are not cleaned and are not connected, if liquid flows out of the drain channel, the position of the adjusting assembly is adjusted to move the rotating rod to a position lower than the first position, thereby enabling fault detection of the drain channel and determining whether the leakage is caused by a fault in the lower or upper valve core assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0024] Figure 3 This is a cross-sectional view of the upper and lower valve seats of the present invention.

[0025] Figure 4 This is a cross-sectional view of the valve core assembly structure of the present invention.

[0026] Figure 5 This is a cross-sectional view of the lower valve stem and lower valve disc of the present invention.

[0027] Figure 6 This is a cross-sectional view showing the structural connection between the valve core assembly and the regulating assembly of the present invention.

[0028] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of part A in the middle.

[0029] Figure 8 This is a cross-sectional view of the valve core assembly structure of the present invention.

[0030] Figure 9This is a schematic diagram showing the connection between the upper valve disc, the clamping member, and the second elastic sealing member of the present invention.

[0031] Figure 10 This is a cross-sectional view showing the connection between the upper valve core assembly and the third piston structure of the present invention.

[0032] Figure 11 This is a cross-sectional view of the internal structure of the power assembly of the present invention.

[0033] Figure 12 This is a schematic diagram showing the connection between the lower valve core assembly and the first and second pistons of the present invention.

[0034] Figure 13 This is a cross-sectional view showing the structural connection between the upper valve core assembly and the lower valve core assembly of the present invention.

[0035] Figure 14 For the present invention Figure 13 Enlarged schematic diagram of the structure at point B.

[0036] Figure 15 This is a cross-sectional view showing the connection between the drive motor, the lower valve stem, and the rotating rod structure of the present invention.

[0037] In the diagram: 1. Upper valve seat; 2. Lower valve seat; 3. Connecting channel; 4. Power assembly; 41. Power compartment; 4101. Compartment cylinder; 4102. Compartment cover; 4103. Compartment base; 42. Limiting boss; 43. First retaining ring; 44. First piston; 45. Elastic reset component; 46. Second piston; 47. Second retaining ring; 48. Third piston; 49. Limiting ring; 410. First air nozzle; 411. Second air nozzle; 412. Third air nozzle; 413. Air relief valve; 5. Upper valve core assembly; 51. Upper valve stem; 52. Limiting platform; 53. 54. Upper valve disc; 55. Clamping component; 56. Receiving groove; 57. Second elastic seal; 68. Reset elastic component; 79. Lower valve core assembly; 60. Lower valve stem; 61. Lower valve disc; 62. Connecting hole; 63. Guide groove; 64. Annular groove; 65. Elastic snap ring; 66. First elastic seal; 67. Extrusion component; 68. Drainage channel; 79. Adjustment assembly; 70. Receiving groove; 71. Limiting slide groove; 72. Elastic reset component; 73. Slider; 74. Rotating rod; 75. Pressure plate; 76. Threaded connecting rod; 77. Drive motor; 8. Sealing component. Detailed Implementation

[0038] 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.

[0039] To address the issue of leakage caused by wear and tear on the sealing structure of anti-mixing valves during long-term use.

[0040] like Figures 1 to 15 As shown, a sanitary double-seat double-seal anti-mixing valve is proposed, including an integrally cast upper valve seat 1 and a lower valve seat 2, a connecting channel 3 that connects the upper valve seat 1 and the lower valve seat 2, and a power assembly 4 connected to the top of the upper valve seat 1.

[0041] It also includes an upper valve core assembly 5, which is disposed within the upper valve seat 1 and is used to seal the upper valve seat 1.

[0042] The lower valve core assembly 6 is disposed within the connecting channel 3 and is used to seal the lower valve seat 2; the present invention uses the upper valve core assembly 5 and the lower valve core assembly 6 to prevent cross-contamination of materials between the upper valve seat 1 and the lower valve seat 2.

[0043] The power assembly 4 is connected to the upper valve core assembly 5 and the lower valve core assembly 6, and can drive the upper valve core assembly 5 or the lower valve core assembly 6 or both to move up and down synchronously. The present invention provides a power assembly 4, which drives the upper valve core assembly 5 to move upward by controlling the power assembly 4, thereby releasing the seal of the upper valve core assembly 5 on the upper valve seat 1, thereby enabling the cleaning of the upper valve core assembly 5 and the upper valve seat 1.

[0044] By controlling the power component 4 to drive the lower valve core assembly 6 to move downward, and at the same time releasing the seal of the lower valve core assembly 6 on the lower valve seat 2, the lower valve core assembly 6 and the lower valve seat 2 can be cleaned.

[0045] By controlling the power component 4 to drive the upper valve core assembly 5 and the lower valve core assembly 6 to move upward synchronously, the upper valve seat 1 and the lower valve seat 2 can be connected to carry out material mixing.

[0046] The regulating component 7 has multiple positions and is located between the upper valve core assembly 5 and the lower valve core assembly 6.

[0047] When it is in the first position, it squeezes the lower valve core assembly 6 to achieve a seal on the lower valve seat 2.

[0048] When it is in the second position, the pressure on the lower valve core assembly 6 is released, and the seal on the lower valve seat 2 is released.

[0049] When it is in the third position, it presses against the upper valve core assembly 5, enhancing the seal against the upper valve seat 1.

[0050] Furthermore, the lower valve core assembly 6 includes a lower valve stem 61, which slides through the upper valve core assembly 5 and extends to the top of the power assembly 4. A drain channel 69 is provided inside the lower valve stem 61 at its end away from the upper valve core assembly 5. By providing the drain channel 69, this invention enables the cleaning liquid inside the upper valve seat 1 or the lower valve seat 2 to be discharged from the drain channel 69, thereby achieving cleaning.

[0051] It should be noted that the lower valve stem 61 is a two-section or multi-section rod structure, such as... Figure 6 As shown, the lower valve stem 61 includes an upper section and a lower section. The lower end of the upper section and the upper end of the lower section are connected by a threaded connection. The lower valve disc 62 is located on the side wall of the lower section. This invention facilitates installation by making the lower valve stem 61 multi-segmented.

[0052] The lower valve disc 62 is located on the side wall of the lower valve stem 61 and within the connecting channel 3. Its top has a guide groove 64 that connects to the drain channel 69 via a connecting hole 63. The outer side wall of its top has an annular groove 65, and an elastic retaining spring 66 is engaged with the side wall of the annular groove 65. The invention uses the elastic retaining spring 66 to limit the position of the extrusion member 68, thereby preventing the extrusion member 68 and the first elastic seal 67 from slipping out of the annular groove 65. Simultaneously, the elastic retaining spring 66 facilitates the replacement of the first elastic seal 67.

[0053] The first elastic seal 67 is fitted inside the annular groove 65.

[0054] The extrusion member 68 is slidably sleeved outside the annular groove 65 and located between the first elastic seal 67 and the elastic snap ring 66. By providing the extrusion member 68, when the extrusion member 68 is compressed, it uniformly compresses the first elastic seal 67, causing it to expand and deform uniformly. The expanded and deformed first elastic seal 67 then seals the connecting channel 3, achieving a seal.

[0055] Furthermore, the adjusting assembly 7 includes a receiving groove 71, which is located at the top of the lower valve stem 61 and extends to the connecting channel 3. Symmetrical limiting grooves 72 are formed on its bottom sidewall. Inside, from bottom to top, are arranged an elastic reset member 73, a slider 74, and a rotating rod 75. The top of the rotating rod 75 extends to the top of the lower valve stem 61, and the top sidewall of the rotating rod 75 is threadedly connected to the top of the receiving groove 71. The rotating rod 75 is driven to rotate by a drive motor 78. This invention controls the operation of the drive motor 78; the rotation of the drive motor 78 will cause the rotating rod 75 to rotate spirally. When the slider moves upward or downward, it will push the slide block 74 to slide upward or downward after overcoming the elastic force of the elastic reset member 73. The upward or downward sliding of the slide block 74 will drive the threaded connecting rod 77 and the pressure plate 76 to move upward or downward synchronously. When the pressure plate 76 moves downward, it will squeeze the extrusion member 68, causing the first elastic seal member 67 to expand and deform, thus blocking the connecting channel 3 and achieving a seal. When the pressure plate 76 moves upward, it will squeeze the second elastic seal member 56, causing the second elastic seal member 56 to expand and deform, thus enhancing the seal on the upper valve seat 1.

[0056] It should be noted here that, as Figure 15 As shown, the drive motor 78 is fixedly connected to the top of the lower valve stem 61, and its output shaft is slidably connected to the top limit of the upper section of the lower valve stem 61.

[0057] Pressure plate 76 is disposed between extrusion part 68 and upper valve core assembly 5.

[0058] A threaded connecting rod 77 is provided, with one end passing through the pressure plate 76 and the limiting slide groove 72, and then threadedly connected to the side wall of the slider 74. By providing the threaded connecting rod 77, this invention achieves the connection between the pressure plate 76 and the slider 74 without affecting the flow of fluid from the middle of the pressure plate 76 into the drain channel 69.

[0059] Specifically, the upper valve core assembly 5 includes an upper valve stem 51 that is slidably fitted outside the lower valve stem 61, with its top extending into the power assembly 4 and being connected to the power assembly 4 in a transmission manner, and its bottom extending into the upper valve seat 1. By controlling the power assembly 4, the present invention enables the power assembly 4 to drive the upper valve stem 51 to slide upward independently. The upward sliding of the upper valve stem 51 will drive the upper valve disc 53 and the second elastic seal 56 to move upward, thereby releasing the seal on the upper valve seat 1.

[0060] The upper valve disc 53 is threaded to the middle of the upper valve stem 51 at its top and extends into the upper valve seat 1 at its bottom. A clamping member 54 is threaded to the inner wall of the bottom of the upper valve disc 53, and a second elastic seal 56 is clamped between the upper valve disc 53 and the clamping member 54. This invention achieves detachable fixing of the second elastic seal 56 through the cooperation of the upper valve disc 53 and the clamping member 54, thereby enabling the replacement of the second elastic seal 56. It should be noted that the bottom surface of the second elastic seal 56 is lower than the bottom surfaces of the upper valve disc 53 and the clamping member 54, thus providing a compression space for the adjusting assembly 7 to compress the second elastic seal 56.

[0061] When the rotating rod 75 moves upward spirally, the elastic force of the elastic reset member 73 will push the slider 74 to slide upward. The upward sliding of the slider 74 will drive the threaded connecting rod 77 and the pressure plate 76 to move upward synchronously and squeeze the second elastic seal 56, causing the second elastic seal 56 to expand and deform, thereby enhancing the seal on the upper valve seat 1.

[0062] Specifically, the upper valve disc 53 has a storage groove 55 at its bottom, the bottom outer wall of the clamping member 54 is inclined, and a trapezoidal storage cavity is formed between the bottom inclined surface of the clamping member 54 and the storage groove 55. The second elastic sealing member 56 is located in the trapezoidal storage cavity.

[0063] Furthermore, the power assembly 4 includes a power compartment 41 with an internal cavity, wherein a limiting boss 42 is provided on the lower inner wall, and the inner cavity is provided with a first retaining ring 43, a first piston 44, an elastic reset component 45, a second piston 46, a second retaining ring 47 and a third piston 48 from top to bottom, wherein the third piston 48 is located in the cavity below the limiting boss 42, and the first retaining ring 43 and the second retaining ring 47 are both engaged with the outer wall of the lower valve stem 61.

[0064] The limiting ring 49 is disposed between the first piston 44 and the second piston 46 and is engaged with the outer wall of the lower valve stem 61. Specifically, the limiting ring 49 of this valve is a spring-loaded structure with elasticity.

[0065] Furthermore, it also includes a first air nozzle 410, which is located on the top of the power chamber 41 and communicates with the cavity inside the power chamber 41. By providing the first air nozzle 410, when air is supplied to the first air nozzle 410 and the air release valve 413 cooperates to release pressure, the first piston 44 will be pushed to squeeze the elastic reset component 45 to move under the action of air pressure. After the first piston 44 contacts the limiting ring 49, the first piston 44 will push the limiting ring 49 and the lower valve rod 61 to move downward. The downward movement of the lower valve rod 61 will drive the lower valve disc 62 and the adjusting component 7 to move downward synchronously.

[0066] The second air nozzle 411 is located at the bottom of the power chamber 41 and communicates with the cavity inside the power chamber 41. By providing air to the second air nozzle 411, the third piston 48 will be pushed upward after overcoming the elastic force of the reset elastic member 57 under the action of air pressure. The upward movement of the third piston 48 will drive the upper valve stem 51, the upper valve disc 53, the clamping member 54 and the second elastic sealing member 56 to move upward synchronously, thereby releasing the seal on the upper valve seat 1 and making the upper valve seat 1 connected to the drain channel 69.

[0067] The third air nozzle 412 is located on the side wall of the power chamber 41 and corresponds to the limiting boss 42. It is connected to the inner cavity of the power chamber 41. When the third air nozzle 412 is pressurized and the air release valve 413 is used to release the pressure, the second piston 46 slides upward. When the second piston 46 comes into contact with the limiting ring 49, the second piston 46 will push the limiting ring 49 and the lower valve rod 61 to move upward. The upward movement of the lower valve rod 61 will drive the lower valve disc 62 and the adjusting component 7 to move upward synchronously. At the same time, the pressure plate 76 of the adjusting component 7 will push the second elastic seal 56 to move upward. The upward movement of the second elastic seal 56 will drive the upper valve rod 51, the upper valve disc 53 and the clamping component 54 to move upward synchronously. This will enable the upper valve core assembly 5 and the lower valve core assembly 6 to move upward synchronously, so that the upper valve seat 1 and the lower valve seat 2 are connected for material mixing.

[0068] A vent valve 413 is disposed on the side wall of the power chamber 41 between the first piston 44 and the second piston 46.

[0069] Specifically, the power compartment 41 includes a compartment 4101, the side wall of which is provided with a docking hole for connecting with the third air nozzle 412 and the vent valve 413.

[0070] The cover 4102 is sealed to the top of the bin 4101, and the top has an interface for docking with the first air nozzle 410.

[0071] The base 4103 has a mating hole on its side wall for mates with the second air nozzle 411, and is sealed to the bottom of the bin 4101. It has an adapter flange at its bottom, and an upper connecting flange on the top of the upper valve seat 1. The upper connecting flange and the adapter flange are connected by a quick-release clamp. This invention uses a quick-release clamp for connection, allowing for rapid disassembly of the power assembly 4 and the upper valve seat 1. During routine maintenance or replacement, operators only need to loosen the quick-release clamp to pull the upper valve core assembly 5 and the lower valve core assembly 6 out of the upper valve seat 1 and lower valve seat 2, greatly reducing maintenance time.

[0072] Furthermore, a vertical guide groove is provided on the middle side wall of the base 4103, and a guide post is threadedly connected to the middle of the upper valve stem 51, with the guide post located inside the vertical guide groove.

[0073] Specifically, the lower valve seat 2 is provided with a lower connecting flange at the bottom, and a sealing element 8 is provided at the bottom of the lower connecting flange to be slidably fitted with the bottom of the lower valve stem 61. The lower connecting flange and the sealing element 8 are connected by a quick-opening clamp. The present invention provides a sealing element 8 for cooperating with the lower valve core assembly 6 to seal the bottom of the lower valve seat 2.

[0074] The upper valve stem 51 is sealed and slidably sleeved inside the third piston 48. The top side wall of the upper valve stem 51 is provided with a limiting platform 52 that is larger than the inner diameter of the third piston 48. A reset elastic element 57 is provided between the top of the upper valve stem 51 and the third piston 48.

[0075] This invention, by setting a limiting platform 52, enables the third piston 48 to move upward, thereby driving the upper valve stem 51 to move upward, while the upper valve stem 51 moving upward does not drive the third piston 48 to move upward. The reset elastic element 57 of this invention is used to push the upper valve stem 51 to reset.

[0076] When the upper valve seat 1 and lower valve seat 2 are not cleaned and are not connected, the drive motor 78 is controlled to operate. The rotation of the drive motor 78 will drive the rotating rod 75 to move downwards in a spiral motion to the first position. After overcoming the elastic force of the elastic reset member 73, the rotating rod 75 will push the slider 74 downwards. The downward movement of the slider 74 will drive the pressure plate 76 downwards. The downward movement of the pressure plate 76 will squeeze the extrusion member 68, causing the first elastic seal 67 to expand and deform, thus sealing the connecting channel 3 and achieving a seal on the lower valve seat 2. At this time, the first elastic seal 67 seals the lower valve seat 2. It should be noted that the position can also be adjusted to a lower position than the first position to further squeeze the first elastic seal 67 and further expand it to enhance the seal on the connecting channel 3. This action can be adjusted according to actual needs to determine whether it is necessary to adjust to a position lower than the first position.

[0077] When the lower valve seat 2 needs to be cleaned, the drive motor 78 is first controlled to operate. The rotation of the drive motor 78 will drive the rotating rod 75 to move spirally upward to the second position. The spiral upward movement of the rotating rod 75 will cause the pressure plate 76 to slide upward. The upward sliding of the pressure plate 76 will release the pressure on the squeezing member 68. The squeezing member 68 will no longer squeeze the first elastic seal 67. The first elastic seal 67 will return to its original state under its own elastic force. At this time, the connecting channel 3 will no longer be blocked. Then, air is supplied to the first air nozzle 410 and the air release valve 413 will cooperate to release the pressure. Under the action of air pressure, the first piston 44 will be pushed to squeeze the elastic reset member 45 to move. After the first piston 44 contacts the limiting ring 49, the first piston 44 will push the limiting ring 49 and the lower valve rod 61 to move downward. The downward movement of the lower valve rod 61 will drive the lower valve disc 62 and the adjusting component 7 to move downward synchronously, thereby making the lower valve seat 2 connected to the drain channel 69, so as to realize the cleaning of the lower valve seat 2. It is important to note that, compared with the prior art, this invention contracts the first elastic seal 67 before moving the lower valve stem 61 and the lower valve disc 62 downward, reducing the friction between the first elastic seal 67 and the connecting channel 3. This ensures that the seal safely crosses the metal edge in a low-friction state, improving the service life of the first elastic seal 67 and avoiding the situation where frequent adjustments cause severe wear of the first elastic seal 67, resulting in a reduced service life. Thus, it significantly improves the service life of the seal and the hygienic reliability of valve operation.

[0078] When it is necessary to enhance the sealing of the upper valve seat 1, the drive motor 78 is controlled to operate. The rotation of the drive motor 78 will drive the rotating rod 75 to move spirally upward to the second position, causing the pressure plate 76 to slide upward and release the pressure on the extrusion member 68. The extrusion member 68 will no longer press on the first elastic seal 67. The first elastic seal 67 will return to its original shape under its own elastic force. At this time, the connecting channel 3 will no longer be blocked. Then, the drive motor 78 is controlled to rotate and drive the rotating rod 75 to move spirally upward to the third position. The top height of the rotating rod 75 in the third position is higher than the top height of the rotating rod 75 in the second position. At this time, the pressure plate 76 slides upward and presses on the second elastic seal 56, causing the second elastic seal 56 to deform and expand, thereby enhancing the sealing of the upper valve seat 1.

[0079] When the upper valve seat 1 needs to be cleaned, air is supplied to the second air nozzle 411. Under the action of air pressure, after overcoming the elastic force of the reset elastic element 57, the third piston 48 is pushed to move upward. The upward movement of the third piston 48 drives the upper valve stem 51, the upper valve disc 53, the clamping element 54, and the second elastic sealing element 56 to move upward synchronously, thereby releasing the seal on the upper valve seat 1 and making the upper valve seat 1 connected to the drain channel 69, thus realizing the cleaning of the upper valve seat 1.

[0080] If liquid flows out of the drain channel 69 when the upper valve seat 1 and lower valve seat 2 are not cleaned and not connected, it indicates that the upper valve core assembly 5 or the lower valve core assembly 6 has a wear failure. At this time, with the adjusting component 7 in the first position, the drive motor 78 continues to work. The rotation of the drive motor 78 will drive the rotating rod 75 to move downward spirally to a position lower than the first position. After overcoming the elastic force of the elastic reset component 73, the rotating rod 75 will push the slider 74 and the pressure plate 76 to move downward synchronously. The downward movement of the pressure plate 76 will continue to squeeze the extrusion component 68, causing the first elastic seal 67 to expand and deform further, thus strengthening the blockage of the connecting channel 3. If the drain channel 69 no longer discharges liquid or the flow rate decreases, it indicates that the lower valve core assembly 6 is faulty. If the flow rate of the drain channel 69 remains unchanged, it indicates that the upper valve core assembly 5 is faulty, and the liquid is leaking from the upper valve seat 1.

[0081] This invention utilizes the cooperation between the upper valve core assembly 5, the lower valve core assembly 6, and the adjusting assembly 7. Firstly, when the adjusting assembly 7 is in the first position, it compresses the lower valve core assembly 6, achieving a seal on the lower valve seat 2. Secondly, when the adjusting assembly 7 is in the second position, it releases the compression on the lower valve core assembly 6, releasing the seal on the lower valve seat 2. At this time, the first elastic seal 67 contracts and no longer expands, reducing friction between the first elastic seal 67 and the connecting channel 3, ensuring the seal safely crosses the metal edge in a low-friction state, thereby significantly improving the service life of the seal and the hygienic reliability of valve operation. Thirdly, when the adjusting assembly 7 is in the third position, it compresses the upper valve core assembly 5, enhancing the seal on the upper valve seat 1. Fourthly, when the upper valve seat 1 and lower valve seat 2 are in a non-cleaning and non-conductive state, if liquid flows out of the drain channel 69, by adjusting the position of the adjusting assembly 7, the rotating rod 75 is moved to a position lower than the first position, achieving fault detection of the drain channel 69, thereby determining whether the leakage is caused by a fault in the lower valve core assembly 6 or the upper valve core assembly 5.

[0082] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sanitary double-seat double-seal anti-mixing valve, comprising an integrally cast upper valve seat (1) and a lower valve seat (2), a connecting channel (3) connecting the upper valve seat (1) and the lower valve seat (2), and a power assembly (4) connected to the top of the upper valve seat (1), characterized in that, It also includes an upper valve core assembly (5), which is disposed in the upper valve seat (1) and is used to seal the upper valve seat (1); The lower valve core assembly (6) is disposed in the connecting channel (3) and is used to seal the lower valve seat (2); The power assembly (4) is connected to the upper valve core assembly (5) and the lower valve core assembly (6) and can drive the upper valve core assembly (5) or the lower valve core assembly (6) or both to move up and down synchronously. The adjusting component (7) has multiple positions and is located between the upper valve core assembly (5) and the lower valve core assembly (6). When it is in the first position, it presses the lower valve core assembly (6) to seal the lower valve seat (2). When it is in the second position, it releases the pressure on the lower valve core assembly (6) and releases the seal on the lower valve seat (2). When it is in the third position, it presses the upper valve core assembly (5) to enhance the seal on the upper valve seat (1).

2. The double-seat, double-seal anti-mixing valve according to claim 1, characterized in that, The lower valve core assembly (6) includes a lower valve stem (61), which slides through the upper valve core assembly (5) and extends to the top of the power assembly (4), and a drain channel (69) is provided inside the end away from the upper valve core assembly (5). The lower valve disc (62) is located on the side wall of the lower valve stem (61) and in the connecting channel (3). A guide groove (64) is provided on its top, which is connected to the drain channel (69) through the connecting hole (63). An annular groove (65) is provided on the outer side wall of its top. An elastic retaining spring (66) is snapped into the side wall of the annular groove (65). The first elastic seal (67) is fitted inside the annular groove (65); The extrusion member (68) is slidably sleeved outside the annular groove (65) and located between the first elastic seal (67) and the elastic snap ring (66).

3. The double-seat, double-seal anti-mixing valve according to claim 2, characterized in that, The adjustment assembly (7) includes a receiving groove (71), which is opened at the top of the lower valve stem (61) and extends to the connecting channel (3). A limiting slide groove (72) is symmetrically opened on its bottom side wall. An elastic reset member (73), a slider (74), and a rotating rod (75) are arranged in sequence from bottom to top inside the assembly. The top of the rotating rod (75) extends to the top of the lower valve stem (61), and the top side wall of the rotating rod (75) is threadedly connected to the top of the receiving groove (71). The rotating rod (75) is driven to rotate by a drive motor (78). Pressure plate (76), which is disposed between the extruder (68) and the upper valve core assembly (5); The threaded connecting rod (77) has one end passing through the pressure plate (76) and the limiting slide groove (72) and then threadedly connected to the side wall of the slider (74).

4. The double-seat, double-seal anti-mixing valve according to claim 1, characterized in that, The upper valve core assembly (5) includes an upper valve stem (51) that is sealed and slidably sleeved outside the lower valve stem (61), with its top extending into the power assembly (4) and being connected to the power assembly (4) in a transmission manner, and its bottom extending into the upper valve seat (1). The upper valve disc (53) is threaded to the middle of the upper valve stem (51) at its top and extends to the upper valve seat (1) at its bottom. A clamping member (54) is threaded to the inner wall of the bottom of the disc, and a second elastic seal (56) is clamped between the disc and the clamping member (54).

5. The double-seat, double-seal anti-mixing valve according to claim 4, characterized in that, The power assembly (4) includes a power chamber (41) with an internal cavity, wherein a limiting boss (42) is provided on the lower inner wall, and the inner cavity is provided with a first snap ring (43), a first piston (44), an elastic reset component (45), a second piston (46), a second snap ring (47) and a third piston (48) from top to bottom, wherein the third piston (48) is located in the cavity below the limiting boss (42), wherein the first snap ring (43) and the second snap ring (47) are both engaged with the outer wall of the lower valve stem (61); A limiting ring (49) is disposed between the first piston (44) and the second piston (46) and is engaged with the outer wall of the lower valve stem (61).

6. The double-seat, double-seal anti-mixing valve according to claim 5, characterized in that, It also includes a first air nozzle (410), which is located on the top of the power compartment (41) and communicates with the cavity inside the power compartment (41); The second air nozzle (411) is located at the bottom of the power compartment (41) and is connected to the cavity inside the power compartment (41); The third air nozzle (412) is located on the side wall of the power compartment (41) and at a position corresponding to the limiting boss (42), and it is connected to the cavity inside the power compartment (41). A vent valve (413) is disposed on the side wall of the power compartment (41) between the first piston (44) and the second piston (46).

7. The double-seat, double-seal anti-mixing valve according to claim 6, characterized in that, The power compartment (41) includes a compartment cylinder (4101), and its side wall is provided with a docking hole for docking with the third air nozzle (412) and the vent valve (413); The bin cover (4102) is sealed to the top of the bin (4101), and the top is provided with a mating interface for connecting with the first air nozzle (410); The base (4103) has a docking hole on its side wall that connects with the second air nozzle (411). It is sealed to the bottom of the bin (4101). It has an adapter flange at its bottom. The upper valve seat (1) has an upper connecting flange at its top. The upper connecting flange and the adapter flange are connected by a quick-release clamp.

8. The double-seat, double-seal anti-mixing valve according to claim 2, characterized in that, The lower valve seat (2) is provided with a lower connecting flange at the bottom. The lower connecting flange is provided with a sealing element (8) that is slidably connected to the bottom of the lower valve stem (61). The lower connecting flange and the sealing element (8) are connected by a quick-opening clamp.

9. The double-seat, double-seal anti-mixing valve according to claim 5, characterized in that, The upper valve stem (51) is sealed and slidably sleeved inside the third piston (48). The top side wall of the upper valve stem (51) is provided with a limiting platform (52) larger than the inner diameter of the third piston (48). A reset elastic element (57) is provided between the top of the upper valve stem (51) and the third piston (48).

10. The double-seat, double-seal anti-mixing valve according to claim 4, characterized in that, The upper valve disc (53) has a storage groove (55) at its bottom. The bottom outer wall of the clamping member (54) is inclined. A trapezoidal storage cavity is formed between the bottom inclined surface of the clamping member (54) and the storage groove (55). The second elastic sealing member (56) is located in the trapezoidal storage cavity.

Images