Low-pressure mixing safety valve

Abstract

The utility model relates to the technical field of valves, in particular to a low-pressure mixing safety valve, which comprises a valve body, a valve cover locked on the valve body, an exhaust port arranged on the valve cover and an air inlet arranged on the valve body, and a pressure plate used for sealing the air inlet is arranged between the valve body and the valve cover through an elastic pressure regulating device.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a low-pressure mixing safety valve. Background Art

[0002] A safety valve is a special valve that is normally closed under the action of external force. When the medium pressure in the equipment or pipeline exceeds the specified value, it prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium outside the system. It plays the role of overpressure protection and low-pressure sealing. However, the function of most safety valves to adjust the pressure to the specified value is very simple and extremely prone to deviations. Utility Model Content

[0003] Therefore, in view of the above problems, the utility model proposes a low-pressure mixing safety valve.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is to provide a low-pressure mixing safety valve, including a valve body, a valve cover locked on the valve body, an exhaust port opened on the valve cover, and an air inlet opened on the valve body, and a pressure plate for sealing the air inlet is arranged between the valve body and the valve cover through an elastic pressure regulating device.

[0005] Further improvement is that: the elastic pressure regulating device includes: a plurality of guide columns arranged between the valve body and the valve cover through a clamping device, a first sliding hole opened on the pressure plate for slidingly matching with the guide columns, a lifting plate arranged on the guide columns which can slide up and down through a lifting device, and a spring which is sleeved on the guide column and has one end resisting the lifting plate and the other end resisting the pressure plate.

[0006] A further improvement is that the clamping device includes: a circular groove opened on the valve body, a circular ring arranged in the circular groove, the guide column is arranged on the circular ring and its height is close to the height between the valve body and the valve cover, and a rubber sleeve is also arranged on the end of the guide column to cooperate with the clamping guide column after the valve cover and the valve body are locked.

[0007] A further improvement is that the lifting device includes: a lifting thread opened on at least one guide column, a lifting nut locked on the lifting thread, a guide device is also provided between the lifting plate and the guide column, and the lifting nut is connected to the lifting plate by a rotating connecting device to prevent the lifting plate from being pressed down and affecting the elastic force of the spring.

[0008] Further improvement is that: the rotating connection device includes: an annular groove opened at the bottom of the lifting nut, an annular protrusion arranged on the lifting plate for inserting into the groove, a first limiting ring platform arranged on the annular groove, a second limiting ring platform opened on the annular protrusion, a retaining spring sleeved on the annular protrusion and used to cooperate with the first limiting ring platform and the second limiting ring platform to engage the lifting nut and the lifting plate, and an avoidance hole opened on the lifting plate for avoiding the guide column with a lifting thread.

[0009] A further improvement is that the guide device comprises a guide block arranged on the lifting plate, and a second sliding hole opened on the guide block and the lifting plate for cooperating with the guide column.

[0010] A further improvement is that a sealing gasket for enhancing sealing is also provided on one side of the pressure plate close to the air inlet.

[0011] A further improvement is that: the air inlet is also provided with a connecting thread for mounting the valve body on a pipeline.

[0012] A further improvement is that a connecting flange is also provided on the valve body for mounting the valve body on a pipeline.

[0013] The advantages and beneficial effects of the utility model are:

[0014] The structure is simple and easy to use. The pressure plate is compressed by multiple springs, so that the force acting on the pressure plate is more balanced. The spring is easy to replace, so the user can adjust the pressure of the pressure plate directly by replacing the spring or reducing or increasing the number of springs. A liftable lifting plate is also provided, so the user can adjust the pressure of the spring without replacing the spring. The pressure adjustment method is diverse and simple, so the user can adjust it quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front sectional schematic diagram of a low-pressure mixing safety valve of the utility model;

[0016] Figure 2 This is an enlarged schematic diagram of part A of a low-pressure mixing safety valve of the utility model;

[0017] In the figure: 1. valve body; 2. valve cover; 3. exhaust port; 4. air inlet; 5. pressure plate; 6. guide column; 7. first sliding hole; 8. lifting plate; 9. spring; 10. circular groove; 11. circular ring; 12. rubber sleeve; 13. lifting nut; 14. annular groove; 15. annular protrusion; 16. first limit ring; 17. second limit ring; 18. retaining spring; 19. avoidance hole; 20. guide block; 21. second sliding hole; 22. sealing gasket; 23. connecting flange. DETAILED DESCRIPTION

[0018] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] like Figure 1-Figure 2 As shown, a low-pressure mixing safety valve comprises a valve body 1, a valve cover 2 locked on the valve body 1, an exhaust port 3 opened on the valve cover 2, and an air inlet 4 opened on the valve body 1, and a pressure plate 5 for sealing the air inlet 4 is arranged between the valve body 1 and the valve cover 2 through an elastic pressure regulating device.

[0020] In order to facilitate the adjustment of the force acting on the pressure plate 5 and make the force more balanced, the elastic pressure regulating device includes: a plurality of guide columns 6 arranged between the valve body 1 and the valve cover 2 through a clamping device, a first sliding hole 7 opened on the pressure plate 5 for sliding in matching with the guide column 6, a lifting plate 8 arranged on the guide column 6 which can slide up and down through a lifting device, and a spring 9 which is sleeved on the guide column 6 and has one end resisting the lifting plate 8 and the other end resisting the pressure plate 5.

[0021] In order to facilitate the installation and disassembly of the pressure plate 5 and the lifting and regulating device, the clamping device includes: a circular groove 10 opened on the valve body 1, and a circular ring 11 arranged in the circular groove 10. The guide column 6 is arranged on the circular ring 11 and its height is close to the height between the valve body 1 and the valve cover 2. A rubber sleeve 12 is also arranged on the end of the guide column 6 for cooperating to clamp the guide column 6 after the valve cover 2 and the valve body 1 are locked.

[0022] In order to control the lifting and lowering of the lifting plate 8, the lifting device includes: a lifting thread (not shown in the figure) opened on at least one guide column 6, and a lifting nut 13 locked on the lifting thread. A guide device is also provided between the lifting plate 8 and the guide column 6. The lifting nut 13 is connected to the lifting plate 8 through a rotating connecting device to prevent the lifting plate 8 from being pressed down and affecting the elastic force of the spring 9.

[0023] In order to facilitate the adjustment of the height of the lifting plate 8 and prevent the weight of the lifting plate 8 from acting on the spring 9, the rotating connection device includes: an annular groove 14 opened at the bottom of the lifting nut 13, an annular protrusion 15 arranged on the lifting plate for inserting into the groove, a first limiting ring platform 16 arranged on the annular groove 14, a second limiting ring platform 17 opened on the annular protrusion 15, a retaining spring 18 sleeved on the annular protrusion 15 and used to cooperate with the first limiting ring platform 16 and the second limiting ring platform 17 to engage the lifting nut 13 and the lifting plate 8, and an avoidance hole 19 opened on the lifting plate 8 for avoiding the guide column 6 with a lifting thread.

[0024] The inner ring size of the retaining spring 18 is smaller than the outer diameter of the second limiting ring 17 , and the outer ring size of the retaining spring 18 is larger than the outer ring size of the first limiting ring 16 .

[0025] During installation, the retaining spring 18 is sleeved on the annular protrusion 15, and then the retaining spring 18 is pressed by hand to deform it so that it can enter the groove, and then moved to the upper side of the first limiting ring platform 16. The retaining spring 18 is restored to achieve the engagement of the first limiting ring platform 16 and the second limiting ring platform 17.

[0026] In order to enhance the stability of the lifting plate 8 after movement and reduce the inclination, the guide device includes: a guide block 20 arranged on the lifting plate 8, and a second sliding hole 21 opened on the guide block 20 and the lifting plate 8 for cooperating with the guide column 6.

[0027] In order to enhance the sealing performance, a sealing gasket 22 for enhancing the sealing performance is further provided on the side of the pressure plate 5 close to the air inlet 4, and the sealing gasket 22 is a rubber gasket.

[0028] In order to facilitate the installation of the safety valve, the air inlet 4 is also provided with a connecting thread (not shown in the figure) for installing the valve body 1 on the pipeline, and the valve body 1 is also provided with a connecting flange 23 for installing the valve body 1 on the pipeline.

[0029] Working principle: When in use, place the ring 11 in the circular groove 10, install the pressure plate 5, and then install the spring 9. According to actual needs, put in springs 9 with appropriate elastic force and quantity, and finally install the lifting plate 8. Adjust the height of the lifting plate 8 through the lifting nut 13 to further adjust the pressure setting value of the safety valve. It is easy to install and the adjustment methods are diverse and simple.

[0030] The basic principles, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A low-pressure mixing safety valve, comprising a valve body, a valve cover locked on the valve body, an exhaust port opened on the valve cover, and an air inlet opened on the valve body, characterized in that: A pressure plate for sealing the air inlet is arranged between the valve body and the valve cover via an elastic pressure regulating device; The elastic pressure regulating device comprises: a plurality of guide posts arranged between the valve body and the valve cover through a clamping device, a first sliding hole provided on the pressure plate for slidingly matching with the guide posts, a lifting plate arranged on the guide posts and capable of sliding up and down through a lifting device, and a spring sleeved on the guide posts with one end resisting the lifting plate and the other end resisting the pressure plate; The lifting device comprises: a lifting thread provided on at least one guide column, a lifting nut locked on the lifting thread, a guide device is also provided between the lifting plate and the guide column, and the lifting nut is connected to the lifting plate through a rotating connection device to prevent the lifting plate from pressing down and affecting the elastic force of the spring; The rotating connection device includes: an annular groove formed at the bottom of the lifting nut, an annular protrusion provided on the lifting plate for inserting into the groove, a first limiting ring platform provided on the annular groove, a second limiting ring platform provided on the annular protrusion, a retaining spring sleeved on the annular protrusion and used to cooperate with the first limiting ring platform and the second limiting ring platform to engage the lifting nut and the lifting plate, and an avoidance hole provided on the lifting plate for avoiding a guide column provided with a lifting thread.

2. A low-pressure mixing safety valve according to claim 1, characterized in that: The clamping device includes: a circular groove opened on the valve body, a circular ring arranged in the circular groove, the guide column is arranged on the circular ring and its height is close to the height between the valve body and the valve cover, and a rubber sleeve is also arranged on the end of the guide column for cooperating to clamp the guide column after the valve cover and the valve body are locked.

3. A low-pressure mixing safety valve according to claim 1, characterized in that: The guide device comprises: a guide block arranged on the lifting plate, and a second sliding hole opened on the guide block and the lifting plate and used for matching with the guide column.

4. A low-pressure mixing safety valve according to claim 1, characterized in that: A sealing gasket for enhancing sealing is also provided on one side of the pressure plate close to the air inlet.

5. A low-pressure mixing safety valve according to claim 1, characterized in that: The air inlet is also provided with a connecting thread for installing the valve body on the pipeline.

6. A low-pressure mixing safety valve according to claim 1, characterized in that: The valve body is also provided with a connecting flange for installing the valve body on a pipeline.

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