Pressure-adjustable check valve

Abstract

The utility model discloses a pressure-adjustable check valve which comprises a valve body, a valve cavity, a water inlet, a water outlet, a valve plate, a rotating shaft, a swing rod, a deflector rod, a tension spring, an adjusting piece and a box body, the valve plate is connected with the rotating shaft through the swing rod, one end of the rotating shaft is connected with the deflector rod, and the deflector rod is connected with the adjusting piece through the tension spring. The adjusting part controls the tensile force of the tension spring through the adjusting screw and the nut so as to adjust the opening pressure of the valve plate, the rotating shaft is installed in the shaft seat provided with the sealing sleeve and the rubber ring, the sealing performance is ensured, limiting and positioning are achieved through cooperation of the clamping table, the clamping groove and the receding groove, and the non-return structure responds in time and is reliable in non-return. And the opening water pressure can be flexibly adjusted according to actual working conditions, the applicability is improved, and the sealing life is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a pressure-adjustable check valve. Background Technology

[0002] A check valve is a one-way valve commonly used in fluid transport systems. Its main function is to automatically open when the fluid flows in one direction and automatically close when a backflow tendency occurs, thus preventing system failures caused by backflow. Currently, check valves are widely used in water supply and drainage, HVAC, fire protection, and industrial piping systems. Their structure typically includes basic components such as a valve body, valve plate, and shaft. Some structures also include springs or gravity fittings to achieve the self-closing function.

[0003] While existing check valves possess basic backflow prevention capabilities, their response to water flow pressure in different application scenarios is relatively limited, lacking the ability to flexibly adjust opening pressure. Although some products achieve coarse pressure regulation by replacing springs or adjusting limit components, these methods are often inconvenient and have limited adjustment ranges, failing to sensitively adjust valve opening and closing conditions according to actual water pressure changes. Furthermore, the spring force of the check mechanism in existing structures is usually fixed, making it difficult to open the valve at slightly lower water pressures, while slightly higher pressures may cause excessive impact on the valve plate, affecting system stability and valve lifespan.

[0004] Therefore, existing check valves still have shortcomings in terms of adaptability, ease of adjustment, and hydraulic response control under different pressure environments. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a pressure-adjustable check valve, which can flexibly adjust the opening pressure of the check valve structure according to the needs, so as to improve its functional performance and stability in practical applications.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pressure-adjustable check valve includes a valve body, a valve cavity inside the valve body, an inlet and an outlet at the left and right ends of the valve body, a valve plate that blocks the inlet inside the valve cavity, an inspection port at the upper end of the valve body, an end cap installed at the inspection port, a hollow bearing seat on the upper left side of the valve body, the inner cavity of the bearing seat communicating with the valve cavity, a rotating shaft installed inside the bearing seat, and a rocker arm fixed on the right side of the valve plate, the upper end of the rocker arm being connected to the rotating shaft.

[0008] A housing is fixed to the front of the valve body. The front end of the rotating shaft extends to the inside of the housing and is fixed with a lever that tilts to the upper right. A tension spring is fixed to the lower right side of the lever. One end of the tension spring is connected to an adjusting component fixed inside the housing. A cover is installed at the opening of the housing.

[0009] Furthermore, through holes are provided at both the front and rear ends of the bearing seat. A sealing screw is installed at the rear through hole, and a sealing sleeve is threadedly installed at the front through hole. The sealing sleeve is fitted on the outside of the rotating shaft, and multiple rubber rings are fixed on the inside of the sealing sleeve.

[0010] Furthermore, the rotating shaft is inserted into the inner side of the shaft seat through the front through hole, and a protruding retaining plate is fixed in the middle part of the rotating shaft. A clearance groove that mates with the retaining plate is opened on the inner wall of the front through hole.

[0011] Furthermore, a sleeve is fixed to the upper end of the swing arm and fits onto the rotating shaft. A slot for engaging with the locking platform is provided on the inner side of the sleeve.

[0012] Furthermore, one end of the lever is fixed with a threaded head that connects to the rotating shaft, and the other end of the lever is provided with a hanging hole.

[0013] Furthermore, one end of the tension spring is fixed with a hook that hangs in the hanging hole, and the other end of the tension spring is fixed with a nut.

[0014] Furthermore, the adjusting component includes a support plate fixed inside the housing, with an adjusting screw connected to a nut inserted through the center of the support plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The check valve structure incorporates a linkage mechanism between a lever and a tension spring. Water pressure drives the valve plate to rotate and open the valve. When the water pressure decreases or backflow occurs, the valve plate quickly returns to its original position under the action of the tension spring to complete the sealing. This effectively solves the problems of delayed response and inadequate check valve sealing under fluctuating water pressure conditions, thus improving the timeliness of the check valve response and the reliability of the seal.

[0017] By setting an adjusting screw and nut and connecting them with a tension spring to form a pressure regulating structure, the tension of the tension spring can be adjusted according to the actual working conditions, thereby achieving flexible setting of the check valve opening water pressure. This solves the problems of the existing check valve opening pressure being non-adjustable and having a narrow range of applications, and improves the adaptability and versatility of the device.

[0018] Sealing screws and sealing sleeves are provided at the front and rear through holes of the shaft seat, respectively. Multiple rubber rings are set on the inner side of the sealing sleeve, which can effectively prevent water from seeping into the box along the shaft. This solves the problems of poor shaft sealing performance and easy corrosion of internal parts by water vapor in traditional check valves, and improves the sealing effect and service life of the device.

[0019] By setting up a locking platform, locking groove, and clearance groove with a limiting structure, the positioning of the rotating shaft during installation is more accurate, avoiding rotational deviation or loosening. This solves the problem of decreased check valve performance due to structural loosening during long-term operation, and enhances the overall operational stability and reliability of the machine. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the valve body of this utility model;

[0021] Figure 2 This is a schematic diagram of the external structure of the valve body of this utility model;

[0022] Figure 3 This is a schematic diagram of the bearing seat of this utility model;

[0023] Figure 4 This is a schematic diagram of the cooperation structure between the rotating shaft and the rocker arm of this utility model;

[0024] Figure 5 This is a schematic diagram of the lever of this utility model;

[0025] Figure 6 This is a schematic diagram of the mating structure of the tension spring and adjusting component of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Valve plate; 2. Rotating shaft; 21. Clamping platform; 3. Rocker arm; 31. Sleeve; 4. Inspection port; 5. End cap; 6. Outlet; 7. Valve chamber; 8. Inlet; 9. Lever; 91. Hanging hole; 92. Threaded head; 10. Tension spring; 101. Hook; 102. Nut; 11. Adjusting component; 111. Adjusting screw; 112. Support plate; 12. Box cover; 13. Box body; 14. Sealing screw; 15. Shaft seat; 16. Sealing sleeve. Detailed Implementation

[0028] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0029] like Figure 1 , Figure 2 and Figure 3As shown, a pressure-adjustable check valve includes a valve body; a valve cavity 7 is provided inside the valve body, forming a cavity space for water flow and the swinging of a valve plate 1; an inlet 8 and an outlet 6 are respectively provided at the left and right ends of the valve body, the inlet 8 is used to receive water from the water supply pipeline, and the outlet 6 is used to guide the water to the downstream pipeline; a valve plate 1 is provided inside the valve cavity 7 to block the inlet 8, and the valve plate 1 controls the flow of water by its own rotation angle to achieve the check valve function; an inspection port is provided at the upper end of the valve body for inspection. An end cap 5 is installed at the end of the valve body, which facilitates the inspection and replacement of internal components. A hollow bearing seat 15 is provided on the upper left side of the valve body. The bearing seat 15 serves as a structural component supporting the rotating shaft 2, and its inner cavity is connected to the valve cavity 7 so that the rotating shaft 2 can be installed through it. The rotating shaft 2 is installed on the inner side of the bearing seat 15. The rotating shaft 2 serves as the core component for power transmission and drives the valve plate 1 to open and close through its own rotation. A rocker arm 3 is fixed on the right side of the valve plate 1. The upper end of the rocker arm 3 is connected to the rotating shaft 2 and is used to transmit the rotational force of the rotating shaft 2 to the valve plate 1 to achieve swing control.

[0030] A housing 13 is fixed to the front of the valve body. The housing 13 serves as the mounting structure for the adjustment and linkage components and is stably and reliably connected to the valve body. The front end of the rotating shaft 2 extends to the inside of the housing 13 and is fixed with a lever 9 that tilts upward to the right. The lever 9 serves as the adjustment drive component, and its tilted design helps to enhance the reaction path of the tension spring 10 during the force process. A tension spring 10 is fixed to the lower right side of the lever 9. The tension spring 10 serves as an elastic element and provides closing force to the valve plate 1, ensuring the stability of the check function. One end of the tension spring 10 is connected to an adjusting component 11 fixed inside the housing 13. The adjusting component 11 is used to adjust the water pressure required for the valve plate 1 to open by changing the tension of the tension spring 10, responding to different pressure conditions. A cover 12 is installed at the opening of the housing 13. The cover 12 facilitates sealing and protection of the internal mechanism, preventing impurities from entering or water vapor from corroding.

[0031] like Figure 3 As shown, the bearing seat 15 has through holes at both the front and rear ends to facilitate the insertion and installation of the rotating shaft 2; a sealing screw 14 is installed at the rear through hole to seal the through hole and ensure a sealing effect; a sealing sleeve 16 is threadedly installed at the front through hole, which is fitted on the outside of the rotating shaft 2, and multiple rubber rings are fixed on its inner side; the multiple rubber rings form multiple sealing barriers, which can effectively prevent water or impurities from seeping into the housing 13 through the bearing seat 15, thereby improving the overall sealing performance and service life of the machine.

[0032] like Figure 4As shown, the rotating shaft 2 is inserted into the inner side of the bearing seat 15 through the front through hole, forming a rotational support relationship; a protruding locking platform 21 is fixed in the middle part of the rotating shaft 2. The locking platform 21 serves as a positioning structure to ensure that the rotating shaft 2 runs stably within the bearing seat 15; a clearance groove is provided on the inner wall of the front through hole to cooperate with the locking platform 21. The clearance groove is used to limit and position the locking platform 21, preventing the rotating shaft 2 from moving axially, thereby improving rotational stability and positioning accuracy.

[0033] like Figure 4 As shown, the upper end of the rocker arm 3 is fixed with a sleeve 31 that is sleeved on the rotating shaft 2. The sleeve 31 is used to connect the transmission interface between the rotating shaft 2 and the rocker arm 3. The inner side of the sleeve 31 is provided with a slot that cooperates with the locking platform 21. The cooperation between the slot and the locking platform 21 realizes reliable torque transmission between the rotating shaft 2 and the rocker arm 3, ensuring accurate opening and closing response of the valve plate 1.

[0034] like Figure 5 As shown, one end of the lever 9 is fixed with a threaded head 92 that connects to the rotating shaft 2. The threaded head 92 ensures that the lever 9 and the rotating shaft 2 are tightly and reliably connected by a threaded connection, avoiding loosening due to long-term operation. The other end of the lever 9 is provided with a hanging hole 91, which serves as the mounting interface for the tension spring 10, ensuring that the tension spring is in a stable force direction.

[0035] like Figure 6 As shown, one end of the tension spring 10 is fixed with a hook 101 that hangs in the hanging hole 91. The hook 101 is connected to the hanging hole 91 at the end of the lever 9 to achieve the initial fixed positioning of the tension spring 10. The other end of the tension spring 10 is fixed with a nut 102. The nut 102 is an adjustment end accessory. By displacement, the working length and tension strength of the tension spring 10 are changed to achieve precise control of the valve opening pressure.

[0036] like Figure 6 As shown, the adjusting component 11 includes a support plate 112 fixed inside the housing 13. The support plate 112 serves as the structural base of the adjusting system, providing support and stability. An adjusting screw 111 connected to the nut 102 is inserted through the center of the support plate 112. The adjusting screw 111 can be turned to control the position change of the nut 102, thereby achieving continuous adjustment of the tension of the tension spring 10. This structure, while continuing the check valve function of the traditional check valve, further enhances the valve opening response capability under different water pressure scenarios, realizing the integration of check valve functionality and intelligent adjustment.

[0037] The working principle of this utility model is as follows: the tension spring 10 tightly pulls the lever 9, thereby causing the rotating shaft 2 to rotate clockwise. The rotating shaft 2 drives the swing arm 3 to swing clockwise, causing the valve plate 1 to block the water inlet 8 to prevent water backflow. When the water pressure at the water inlet 8 increases, the water pressure drives the valve plate 1 to counteract the elastic tension of the tension spring 10 and rotate counterclockwise. The water then flows into the valve cavity 7 and is discharged through the water outlet 6, thereby realizing the water flow of the valve body.

[0038] When it is necessary to adjust the water pressure through the valve body, the position of the nut 102 is adjusted by turning the adjusting screw 111, thereby adjusting the tension of the tension spring 10. The different tensions of the tension spring 10 result in different water pressure bearing capacities of the valve plate 1, thus achieving water pressure adjustment.

[0039] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A pressure-adjustable check valve, comprising a valve body, wherein a valve cavity (7) is provided on the inner side of the valve body, and an inlet (8) and an outlet (6) are respectively provided at the left and right ends of the valve body, a valve plate (1) for blocking the inlet (8) is provided on the inner side of the valve cavity (7), and an inspection port is provided at the upper end of the valve body, wherein an end cap (5) is installed at the inspection port, characterized in that: The upper left side of the valve body is provided with a hollow bearing seat (15), and the inner cavity of the bearing seat (15) is connected to the valve cavity (7). A rotating shaft (2) is installed on the inner side of the bearing seat (15). A rocker arm (3) is fixed on the right side of the valve plate (1). The upper end of the rocker arm (3) is connected to the rotating shaft (2). A box (13) is fixed to the front side of the valve body. The front end of the rotating shaft (2) extends to the inside of the box (13) and is fixed with a lever (9) that tilts to the upper right. A tension spring (10) is fixed to the lower right side of the lever (9). One end of the tension spring (10) is connected to an adjusting component (11) fixed inside the box (13). A box cover (12) is installed at the opening of the box (13).

2. The pressure-adjustable check valve according to claim 1, characterized in that: The bearing seat (15) has through holes at both the front and rear ends. A sealing screw (14) is installed at the through hole on the rear side, and a sealing sleeve (16) is threadedly installed at the through hole on the front side. The sealing sleeve (16) is fitted on the outside of the rotating shaft (2), and multiple rubber rings are fixed on the inside of the sealing sleeve (16).

3. The pressure-adjustable check valve according to claim 2, characterized in that: The rotating shaft (2) is inserted into the inner side of the bearing seat (15) through the through hole on the front side, and a protruding locking platform (21) is fixed in the middle part of the rotating shaft (2). A clearance groove that cooperates with the locking platform (21) is provided on the inner wall of the through hole on the front side.

4. The pressure-adjustable check valve according to claim 3, characterized in that: The upper end of the swing rod (3) is fixed with a sleeve (31) that is sleeved on the rotating shaft (2), and the inner side of the sleeve (31) is provided with a slot that cooperates with the card table (21).

5. A pressure-adjustable check valve according to claim 1, characterized in that: One end of the lever (9) is fixed with a threaded head (92) connected to the rotating shaft (2), and the other end of the lever (9) is provided with a hanging hole (91).

6. A pressure-adjustable check valve according to claim 5, characterized in that: One end of the tension spring (10) is fixed with a hook (101) that hangs in the hanging hole (91), and the other end of the tension spring (10) is fixed with a nut (102).

7. A pressure-adjustable check valve according to claim 6, characterized in that: The adjusting component (11) includes a support plate (112) fixed inside the housing (13), and an adjusting screw (111) connected to a nut (102) is inserted through the center of the support plate (112).

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