Backpressure valve for sanitary ultra-micro pressure

Abstract

The utility model discloses a back pressure valve for sanitary ultra-micro pressure, which belongs to the field of self-operated pressure regulating valves, and comprises a back pressure valve top shell, an upper valve body is fixedly connected to the bottom end of the back pressure valve top shell, a lower valve body is arranged at the bottom of the upper valve body, a membrane is arranged between the upper valve body and the lower valve body, a back disc is arranged below the membrane, and the back disc is fixedly connected with the back pressure valve top shell. A spring is fixedly connected to the lower portion of the back disc, a connecting plate is arranged in the back pressure valve top shell, a pull rod is arranged outside the right side of the connecting plate, and the bottom of the pull rod is fixedly connected to the diaphragm and the back disc. The combination of the diaphragm piece and the connecting rod mechanism is adopted in the back pressure valve, a large number of sealing rings are prevented from being used, the pressure adjusting precision of the valve is improved, meanwhile, the valve is more durable, the inner surface of the valve cavity is smooth, no cleaning blind area exists, and the application requirement of the sanitary level is met. The stability of continuous low pressure in the container can be met, the structural process meets the sanitary requirement, and the structure is simple, free of maintenance and convenient to disassemble.

Description

Technical Field

[0001] This utility model belongs to the field of self-operated pressure regulating valves, specifically relating to a back pressure valve for sanitary ultra-low pressure applications. Background Technology

[0002] A back pressure valve is a type of valve used to control and maintain pressure within a system. It is a critical pressure management component in industrial processes, widely used in pharmaceutical engineering, food and beverage engineering, and biotechnology and chemical engineering. Placed in fluid pipelines or equipment, it ensures that downstream pressure remains stable at a set value. The back pressure valve applies resistance to the fluid by adjusting its opening, thereby creating the required pressure upstream of the valve. When the upstream pressure exceeds the set value, the valve automatically opens or increases its opening to release pressure; conversely, it decreases its opening to maintain pressure, indirectly affecting flow rate through pressure control.

[0003] In industries such as pharmaceuticals and petrochemicals, materials within some containers need to be isolated from air by a certain gas. This requires maintaining a stable and continuous pressure for this gas within the container. However, pressure fluctuations within the container due to various external factors necessitate the installation of valves with overflow protection. Current valves with this function suffer from several drawbacks: complex design structures, numerous components, corrosion and wear leading to substandard hygiene, and high friction among components causing leaks at worn areas after use. Furthermore, they cannot provide precise pressure adjustments and therefore fail to offer effective protection. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a back pressure valve for sanitary ultra-low pressure.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: a back pressure valve for sanitary ultra-low pressure, including a back pressure valve top shell, an upper valve body fixedly connected to the bottom end of the back pressure valve top shell, a lower valve body provided at the bottom of the upper valve body, a diaphragm provided between the upper valve body and the lower valve body, a back plate provided below the diaphragm, a spring fixedly connected below the back plate, a connecting plate provided inside the back pressure valve top shell, a pull rod rotatably connected to the right side of the connecting plate; the bottom of the pull rod is fixedly connected to the diaphragm and the back plate; a first air inlet is provided on the right side of the back pressure valve top shell, an air outlet is provided on the left side of the back pressure valve top shell, both the first air inlet and the air outlet penetrate the back pressure valve top shell, a second air inlet is provided on the rear side of the upper valve body, and the second air inlet communicates with the upper valve body.

[0006] Furthermore, the bottom end of the spring abuts against an adjusting screw, the bottom end of the adjusting screw is provided with a handle, and the adjusting screw is threadedly connected to the bottommost end of the lower valve body.

[0007] The above scheme delivers gas to the first air inlet on the top shell of the back pressure valve and the second air inlet on the upper valve body through the tank. The pressure is adjusted by rotating the handle in cooperation with the spring and the adjusting screw. The flow rate is adjusted by the diaphragm, back plate, pull rod, connecting plate and end plug. The pressure value of the back pressure valve is adjusted by changing the compression of the spring by driving the adjusting screw through the handle.

[0008] Furthermore, the left and right ends of the connecting plate are provided with connecting holes for connecting with a rotating shaft, the top end of the pull rod is provided with a connecting hole for connecting with a rotating shaft, the lower right edge of the air outlet is provided with a connecting hole for connecting with a rotating shaft, the lower left edge of the connecting plate is hinged to the lower right edge of the air outlet via a rotating shaft, and the right end of the connecting plate is hinged to the top end of the pull rod via a rotating shaft.

[0009] Furthermore, the air outlet has a through hole inside, a vent hole is provided radially on the right side of the through hole, a guide hole is provided axially on the right side of the through hole, an end plug is provided inside the guide hole, and movable grooves are provided on both the upper and lower sides of the guide hole. The left end of the connecting plate is located in the movable groove and is hinged to the lower right edge of the air outlet by a rotating shaft.

[0010] Furthermore, the right side of the end plug has a through hole that corresponds to the connecting hole on the upper left end of the connecting plate, and is hinged by a connecting shaft.

[0011] Furthermore, the front end of the end plug is fitted with sealing rubber.

[0012] Through the above scheme, with the assistance of the rotating shaft, the position of the diaphragm is changed, causing the position of the connecting rod to change. Then, through the principle of leverage, the sealing distance between the right end of the through hole inside the outlet and the end plug is changed, adjusting the opening degree of the orifice. When gas enters the back pressure valve top shell through the first inlet and the upper valve body through the second inlet, the pressure in the back pressure valve top shell and the upper valve body increases. Under the action of pressure, the diaphragm moves downward, and the spring compresses downward, causing the connecting rod to drive the end plug to move to the right. The exhaust flow rate and velocity of the through hole change. By pulling the connecting rod, the distance between the outlet end plug and the right end of the through hole increases, and the gas flow rate at the outlet will increase. At this time, the pressure in the back pressure valve top shell will decrease synchronously, and the pressure in the upper valve body connected to the second inlet will also decrease. The diaphragm rises under the push of the spring's restoring force, making the distance between the outlet end plug and the right end of the through hole smaller, that is, the opening degree smaller. The exhaust flow rate and velocity at the outlet will decrease. At this time, the pressure at the first inlet will gradually increase, thus achieving automatic adjustment.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention, by employing a combination of a diaphragm and a linkage mechanism within the back pressure valve, avoids the extensive use of sealing rings. This improves the valve's pressure regulation accuracy and durability. The valve cavity has a smooth inner surface with no cleaning blind spots, meeting sanitary application requirements. It can maintain stable low pressure within containers, its structure and manufacturing process meet sanitary requirements, and it is simple, maintenance-free, and easy to disassemble. Attached Figure Description

[0015] Figure 1 This is a front structural schematic diagram of a back pressure valve for sanitary ultra-low pressure according to the present invention.

[0016] Figure 2 This is a cross-sectional structural schematic diagram of a back pressure valve for sanitary-grade ultra-low pressure according to the present invention;

[0017] Figure 3 This is a top view schematic diagram of a back pressure valve for sanitary ultra-low pressure according to this utility model;

[0018] Figure 4 This is a front view of the connecting plate and pull rod portion of a back pressure valve for sanitary ultra-low pressure according to this utility model;

[0019] Figure 5 This is a three-dimensional structural diagram of the connecting plate and pull rod part of a back pressure valve for sanitary ultra-low pressure according to this utility model;

[0020] Figure 6 This is a diagram showing the usage status of a back pressure valve for sanitary-grade ultra-low pressure applications according to this utility model.

[0021] Reference numerals in the attached diagram: 1. Back pressure valve top shell; 2. First air inlet; 3. Air outlet; 4. Second air inlet; 5. Through hole; 6. End plug; 7. Connecting plate; 8. Pull rod; 9. Upper valve body; 10. Diaphragm; 11. Back plate; 12. Lower valve body; 13. Spring; 14. Adjusting screw; 15. Handle; 16. Rotating shaft; 17. Movable groove; 18. Guide hole; 19. Perforation; 20. Tank body; 21. Pressure gauge; 22. Vent hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] like Figure 1-5As shown, a back pressure valve for sanitary ultra-low pressure in this embodiment includes a back pressure valve top shell 1. An upper valve body 9 is fixedly connected to the bottom end of the back pressure valve top shell 1. A lower valve body 12 is provided at the bottom of the upper valve body 9. Both the upper valve body 9 and the lower valve body 12 are made of stainless steel. A diaphragm 10 is disposed between the upper valve body 9 and the lower valve body 12. The diaphragm 10 is made of polytetrafluoroethylene and rubber composite bonded together. A stainless steel back plate 11 is provided below the diaphragm 10. The back plate 11 is used to fix the spring 13 and protect the diaphragm 10. A spring 13 is fixedly connected to the bottom of the back plate 11. The bottom end of the spring 13 abuts against an adjusting screw 14. The adjusting screw 14 is used to compress the spring 13 to increase the pressure value of the back pressure valve. The greater the compression of the spring 13, the greater the pressure value of the back pressure valve. A handle 15 is provided at the bottom end of the adjusting screw 14. The bottom of the lower valve body 12 is threadedly connected to the handle 15, which is used to engage the adjusting screw 14 to compress the spring 13. The handle 15 and the spring 13 are correspondingly arranged. The back pressure valve top shell 1 has a connecting plate 7 inside. Both the left and right ends of the connecting plate 7 have connecting holes for connecting with the rotating shaft 16. The top of the pull rod 8 has a connecting hole for connecting with the rotating shaft 16. The lower right edge of the air outlet 3 has a connecting hole for connecting with the rotating shaft 16. The connecting hole at the lower left edge of the connecting plate 7 is hinged to the connecting hole at the lower right edge of the air outlet 3 through the rotating shaft 16. The rotating shaft 16 passes through the connecting hole at the right end of the connecting plate 7 and the connecting hole at the top of the pull rod 8 to hinge the pull rod. 8; The right side of the connecting plate 7 is externally connected to a rotatable pull rod 8, the bottom of which is fixed to the diaphragm 10 and the back plate 11; the air outlet 3 has a through hole 5 inside, a vent hole 22 is radially provided on the right side of the through hole 5, and a guide hole 18 is axially provided on the right side of the through hole 5. The guide hole 18 has an end plug 6 inside, and movable grooves 17 are provided on the upper and lower sides of the guide hole 18. The left end of the connecting plate 7 is located in the movable groove 17 and is hinged to the lower right edge of the air outlet 3 by a rotating shaft 16; the right side of the end plug 6 has a through hole 19 corresponding to the connecting hole on the upper left side of the connecting plate 7 and is hinged by a connecting rotating shaft.

[0024] like Figure 1-6 As shown, a pull rod 8 is provided on the outer right side of the connecting plate 7, a first air inlet 2 is provided on the right side of the back pressure valve top shell 1, and an air outlet 3 is provided on the left side of the back pressure valve top shell 1. Both the first air inlet 2 and the air outlet 3 penetrate the back pressure valve top shell 1. The air outlet 3 is used to connect to the gas-using equipment. A second air inlet 4 is provided on the rear side of the upper valve body 9, and the second air inlet 4 is connected to the upper valve body 9. Both the first air inlet 2 and the second air inlet 4 are connected to the exhaust port of the tank 20. A pressure gauge 21 is provided on the tank 20. A through hole 5 is provided inside the air outlet 3. A guide hole 18 is provided on the right side of the through hole 5. The guide hole 18 is used to control the movement direction of the end plug 6. The end plug 6 is used to control the gas flow rate of the air outlet 3. Movable grooves 17 are provided on the upper and lower sides of the guide hole 18. The movable grooves 17 are correspondingly arranged with the connecting plate 7. The movable grooves 17 are used to provide movement space for the connecting plate 7.

[0025] The working principle of this embodiment is as follows: The valve body mainly has a first air inlet 2 connected to the tank exhaust port, an air outlet 3 connected to the gas-using equipment, and a second air inlet 4 connected to the tank exhaust port. The tank delivers gas to the first air inlet 2 and the second air inlet 4 set on the top shell 1 of the back pressure valve. The pressure is adjusted by rotating the handle 15 in cooperation with the spring 13 and the adjusting screw 14. The flow rate is adjusted by the diaphragm 10, the back plate 11, the pull rod 8, the connecting plate 7, and the end plug 6. The front end of the end plug 6 is equipped with sealing rubber to seal the right end of the through hole 5. The first air inlet 2 is connected to the second air inlet 4 through a pipe, and a pressure gauge 21 is installed on the pipe. The pressure adjustment part adjusts the pressure value of the back pressure valve by changing the compression of the spring 13 by driving the adjusting screw 14 with the handle 15 (the more the adjusting screw 14 contracts, the greater the compression of the spring 13, and the greater the pressure), to achieve the required pressure range.

[0026] The flow adjustment part changes the position of the diaphragm 10, thereby changing the position of the connected pull rod 8. Then, through the lever principle, the sealing distance between the first air outlet 3 and the end plug 6 inside the air outlet 3 is changed, and the opening degree of the orifice is adjusted, so that the flow rate of the first air outlet 3 is changed. The right end of the first air outlet 3 is provided with a through hole 5. When the end plug 6 is close to the end of the through hole 5 on the right side of the air outlet 3, the flow rate of the air outlet 3 is reduced. The right side of the air outlet 3 is provided with a cylindrical guide hole 18, and the end plug 6 is located in the cylindrical guide hole 18. The right end of the end plug 6 is connected to the connecting plate 7. The right center of the air outlet 3 is provided with a movable groove 17 facing upward and downward, and one end of the connecting plate 7 is located in the movable groove 17. When the pressure at the second inlet 4 increases, the diaphragm 10 descends, pulling the lever 8 to increase the distance between the right side of the outlet 3 through-hole 5 and the end plug 6, thus increasing the gas flow rate at the outlet 3. Simultaneously, the pressure at the first inlet 2 decreases, causing the pressure at the second inlet 4 to also decrease. The diaphragm 10 then rises under the restoring force of the spring 13, moving the lever 8 upwards and causing the end plug 6 to move to the left. This reduces the distance between the right side of the outlet 3 through-hole 5 and the end plug 6, decreasing the opening degree of the outlet and reducing the flow rate at the outlet 3. Consequently, the pressure at the first inlet 2 gradually increases, achieving automatic adjustment. All pipe connections utilize quick-release chucks, facilitating operation and installation, and offering strong versatility.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A back pressure valve for sanitary ultra-low pressure applications, comprising a back pressure valve top shell (1), characterized in that: The bottom end of the back pressure valve top shell (1) is fixedly connected to an upper valve body (9). The bottom of the upper valve body (9) is provided with a lower valve body (12). A diaphragm (10) is provided between the upper valve body (9) and the lower valve body (12). A back plate (11) is provided below the diaphragm (10). A spring (13) is fixedly connected below the back plate (11). A connecting plate (7) is provided inside the back pressure valve top shell (1). A pull rod (8) is rotatably connected to the right side of the connecting plate (7). The bottom of the pull rod (8) is fixedly connected to the diaphragm (10) and the back plate (11). A first air inlet (2) is provided on the right side of the back pressure valve top shell (1). An air outlet (3) is provided on the left side of the back pressure valve top shell (1). The first air inlet (2) and the air outlet (3) both penetrate the back pressure valve top shell (1). A second air inlet (4) is provided on the rear side of the upper valve body (9). The second air inlet (4) is connected to the upper valve body (9).

2. The back pressure valve for sanitary-grade ultra-low pressure as described in claim 1, characterized in that, The bottom end of the spring (13) abuts against the adjusting screw (14), and the bottom end of the adjusting screw (14) is provided with a handle (15). The adjusting screw (14) is threadedly connected to the bottom end of the lower valve body (12).

3. A back pressure valve for sanitary-grade ultra-low pressure as described in claim 1, characterized in that, The connecting plate (7) has connecting holes at both the left and right ends that are connected to the rotating shaft (16). The top end of the pull rod (8) has a connecting hole that is connected to the rotating shaft (16). The lower right edge of the air outlet (3) has a connecting hole that is connected to the rotating shaft (16). The lower left edge of the connecting plate (7) is hinged to the lower right edge of the air outlet (3) through the rotating shaft (16). The right end of the connecting plate (7) is hinged to the top end of the pull rod (8) through the rotating shaft (16).

4. A back pressure valve for sanitary-grade ultra-low pressure as described in claim 3, characterized in that, The air outlet (3) has a through hole (5) inside. A vent hole (22) is provided radially on the right side of the through hole (5). A guide hole (18) is provided axially on the right side of the through hole (5). An end plug (6) is provided inside the guide hole (18). Movable grooves (17) are provided on both the upper and lower sides of the guide hole (18). The left end of the connecting plate (7) is located in the movable groove (17) and is hinged to the lower right edge of the air outlet (3) by a rotating shaft (16).

5. A back pressure valve for sanitary-grade ultra-low pressure as described in claim 4, characterized in that, The end plug (6) has a through hole (19) on the right side, which corresponds to the connecting hole on the upper left side of the connecting plate (7), and is hinged by a connecting shaft.

6. A back pressure valve for sanitary ultra-low pressure as described in claim 4 or 5, characterized in that, The front end of the end plug (6) is fitted with sealing rubber.

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