A built-in safety valve for a metal diaphragm metering pump

Abstract

The utility model discloses a kind of built-in safety valve for metal diaphragm metering pump, it relates to safety valve technical field, the built-in safety valve for metal diaphragm metering pump, when hydraulic chamber pressure exceeds set value, hydraulic oil is pushed through cylinder oil inlet hole, valve seat oil inlet hole valve ball overcomes elastic component elasticity, make valve ball leave oil inlet hole export, hydraulic oil flows into cylinder oil outlet hole through the valve oil outlet hole and residual oil bleeder hole (vertical hole and horizontal hole) on valve body, finally backflow to oil tank and realize overflow unloading;At the same time, with the help of elastic force adjusting assembly (adjusting bolt, locking nut etc.), elastic component elasticity can be adjusted to set opening pressure, to solve the problem of safe and reliable overflow unloading under high pressure or superhigh pressure and make hydraulic oil backflow to oil tank to protect pump.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a built-in safety valve for a metal diaphragm metering pump. Background Technology

[0002] Metal diaphragm metering pumps, as a type of diaphragm metering pump, achieve fluid transport through the periodic flexural deformation of a metal diaphragm (such as a circular stainless steel plate). The diaphragm can withstand pressures up to 120 MPa and temperatures ranging from 200°C to 230°C, making it suitable for transporting high-pressure, high-temperature, and various special media (such as flammable, explosive, and highly corrosive substances), and achieving zero leakage. Its operation relies on a sealed hydraulic chamber composed of a diaphragm, plunger, and cylinder, filled with hydraulic oil. The plunger's movement drives the hydraulic oil, which in turn deforms the diaphragm to complete the suction and discharge of the medium. Simultaneously, the hydraulic system is equipped with an automatic venting valve and an automatic replenishing valve to address issues such as changes in hydraulic oil volume.

[0003] In actual operation, the hydraulic chamber of a metal diaphragm metering pump may experience a change in hydraulic oil volume due to factors such as plunger seal wear and leakage, gas entry or precipitation, excessive replenishment, or unexpected pressure increases in the discharge line, leading to a sharp rise in pressure within the hydraulic chamber. This problem can damage the pump body, therefore a built-in safety valve is needed to safely and reliably overflow and unload under high or ultra-high pressure conditions, guiding the overflowed hydraulic oil back to the reservoir to limit the pressure within a safe range. Utility Model Content

[0004] This invention provides a built-in safety valve for a metal diaphragm metering pump to solve the problem of safely and reliably overflowing and unloading the hydraulic oil under high or ultra-high pressure and returning it to the reservoir to protect the pump.

[0005] This utility model provides the following technical solution: a built-in safety valve for a metal diaphragm metering pump, comprising: a valve seat, wherein the valve seat is connected to the valve body via an external threaded sleeve;

[0006] The valve body has a valve body hole inside, and an elastic component is installed inside the valve body hole. A valve ball is connected to one side of the elastic component through a valve limiter. A valve inlet hole is opened on the valve seat, and the valve ball is connected to the outlet of the valve inlet hole.

[0007] The valve body is provided with an oil outlet hole;

[0008] A screw plug is connected to the side of the valve body away from the valve seat, and an elastic adjustment component is connected to the screw plug. The elastic adjustment component is used to adjust the elastic force of the elastic component.

[0009] As a preferred embodiment of this utility model, a groove is provided on the inlet end of the valve seat, and a first sealing ring and a retaining ring are provided inside the groove.

[0010] As a preferred embodiment of this utility model, the elastic component includes a spring, an upper spring seat and a lower spring seat, one end of the spring is connected to the upper spring seat, the other end of the spring is connected to the lower spring seat, and the lower spring seat is connected to the valve limiting connection;

[0011] The upper spring seat is connected to the spring force adjustment assembly.

[0012] As a preferred embodiment of this utility model, the elastic adjustment assembly includes a locking nut and an adjusting bolt. The locking nut is fixedly connected to a screw plug, and the adjusting bolt is threaded through the locking nut and the screw plug and connected to the upper spring seat.

[0013] As a preferred embodiment of this utility model, the upper spring seat is provided with a placement groove, and a steel ball is placed inside the placement groove. The steel ball is connected to the end of the adjusting bolt.

[0014] As a preferred technical solution of this utility model, the valve body is further provided with residual oil drain holes, and multiple residual oil drain holes are provided, with one end of the residual oil drain hole communicating with the valve body hole.

[0015] As a preferred embodiment of this utility model, the residual oil drain hole includes a vertical hole and a horizontal hole, the vertical hole and the horizontal hole are connected, and the vertical hole is connected to the valve body hole.

[0016] As a preferred technical solution of this utility model, a safety cap is connected to the screw plug, and a second sealing ring is provided between the safety cap and the screw plug;

[0017] A third sealing ring is provided between the screw plug and the valve body.

[0018] As a preferred embodiment of this utility model, a fourth sealing ring is provided on the valve body.

[0019] Compared with the prior art, this utility model provides a built-in safety valve for a metal diaphragm metering pump, which has the following advantages:

[0020] This built-in safety valve for metal diaphragm metering pumps allows hydraulic oil to push the valve ball through the cylinder inlet and valve seat inlet when the hydraulic chamber pressure exceeds the set value. This pushes the valve ball away from the inlet outlet, and the hydraulic oil flows into the cylinder outlet through the valve outlet and residual oil drain holes (vertical and horizontal holes) on the valve body, eventually returning to the reservoir to achieve overflow unloading. At the same time, the elastic force of the elastic component can be adjusted by means of the elastic adjustment component (adjusting bolt, locking nut, etc.) to set the opening pressure, thereby safely and reliably protecting the pump body under high or ultra-high pressure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure at the vertical hole of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure during installation of this utility model.

[0024] In the diagram: 1. External threaded sleeve; 2. Valve seat; 3. Valve ball; 4. Valve limit switch; 5. Fourth sealing ring; 6. Valve body; 7. Spring; 8. Upper spring seat; 9. Plug; 10. Second sealing ring; 11. Safety cap; 12. Adjusting bolt; 13. Locking nut; 14. Third sealing ring; 15. Steel ball; 16. Lower spring seat; 17. Retaining ring; 18. First sealing ring; 19. Valve inlet; 20. Valve outlet; 21. Horizontal hole; 22. Vertical hole; 23. Valve body hole; 25. Cylinder outlet; 26. Cylinder inlet; 27. Hydraulic chamber; 28. Hydraulic cylinder body. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model discloses a built-in safety valve for a metal diaphragm metering pump, including a valve seat 2, which is connected to a valve body 6 via an external threaded sleeve 1. Figure 3 As shown, a built-in safety valve is installed inside the hydraulic cylinder body 28. The hydraulic cylinder body 28 has an oil inlet 26 and an oil outlet 25. The oil inlet 26 communicates with the hydraulic chamber 27, and the oil outlet 25 communicates with the outside of the hydraulic cylinder body 28. The hydraulic cylinder body 28 is connected to the valve seat 2.

[0027] The valve body 6 has a valve body hole 23 inside, and an elastic component is provided inside the valve body hole 23. One side of the elastic component is connected to a valve ball 3 through a valve limit 4. The valve seat 2 has a valve oil inlet hole 19. The valve ball 3 is connected to the outlet of the valve oil inlet hole 19, and the inlet of the valve oil inlet hole 19 is connected to the outlet of the cylinder oil inlet hole 26.

[0028] The valve body 6 is provided with a valve oil outlet hole 20, which is connected to the cylinder oil outlet hole 25 inside the hydraulic cylinder body 28.

[0029] A screw plug 9 is connected to the side of the valve body 6 away from the valve seat 2. An elastic adjustment component is connected to the screw plug 9. The elastic adjustment component is used to adjust the elasticity of the elastic component.

[0030] Specifically, a groove is provided on the inlet end of the valve seat 2, and a first sealing ring 18 and a retaining ring 17 are provided inside the groove. The first sealing ring 18 and the retaining ring 17 are both connected to the inside of the hydraulic cylinder 28 to seal the connection gap between the valve seat 2 and the hydraulic cylinder 28.

[0031] In this embodiment, the outer circle of the valve seat 2 mates with the hole of the hydraulic cylinder 28, and is sealed by the first sealing ring 18 placed on the outer circle of the valve seat 2 to prevent leakage.

[0032] Specifically, the elastic component includes a spring 7, an upper spring seat 8, and a lower spring seat 16. One end of the spring 7 is connected to the upper spring seat 8, and the other end of the spring 7 is connected to the lower spring seat 16. The lower spring seat 16 is connected to the valve limit 4.

[0033] The upper spring seat 8 is connected to the elastic adjustment assembly.

[0034] The elastic adjustment assembly includes a locking nut 13 and an adjusting bolt 12. The locking nut 13 is fixedly connected to the screw plug 9, and the adjusting bolt 12 is threaded through the locking nut 13 and the screw plug 9 and connected to the upper spring seat 8.

[0035] In this embodiment, the adjusting bolt 12 is a screw rod. The adjusting bolt 12 is threaded and engages with the screw plug 9. It is screwed into the screw plug 9. The working height of the spring 7 is adjusted by rotating the adjusting bolt 12. The magnitude of the spring force is changed by changing the installation height of the spring 7, thereby adjusting the opening pressure of the built-in safety valve.

[0036] Specifically, the upper spring seat 8 has a placement groove, and a steel ball 15 is placed inside the placement groove. The steel ball 15 is connected to the end of the adjusting bolt 12.

[0037] In this embodiment, the steel ball 15 can reduce the friction between the adjusting bolt 12 and the placement groove when the bolt rotates, thus preventing wear.

[0038] Specifically, the valve body 6 is also provided with residual oil drain holes, and there are multiple residual oil drain holes. One end of the residual oil drain hole is connected to the valve body hole 23, and the other end is connected to the cylinder oil outlet hole 25.

[0039] The residual oil drain hole includes a vertical hole 22 and a horizontal hole 21, which are connected. The vertical hole 22 is connected to the valve body hole 23, and the horizontal hole 21 is connected to the cylinder oil outlet hole 25.

[0040] In this embodiment, a small amount of hydraulic oil enters the valve body hole 23 through the fitting gap between the valve limit 4 and the valve body 6, and finally exits the valve body 6 through the vertical hole 22 and the horizontal hole 21.

[0041] Specifically, a safety cap 11 is connected to the screw plug 9, and a second sealing ring 10 is provided between the safety cap 11 and the screw plug 9;

[0042] A third sealing ring 14 is provided between the screw plug 9 and the valve body 6.

[0043] The valve body 6 is provided with a fourth sealing ring 5, which is connected to the inside of the hydraulic cylinder 28.

[0044] In this embodiment, the third sealing ring 14 and the fourth sealing ring 5 prevent leakage, and the adjusting bolt 12 is protected by the safety cap 11.

[0045] The working principle and usage process of this utility model are as follows: When using it, see... Figure 1 The valve seat 2 has a valve inlet hole 19 at its center and a stepped platform on its outer circle. The outer circle of the inlet end has a groove, and a first sealing ring 18 and a retaining ring 17 are provided in the groove. The outlet end of the valve seat 2 has a cylindrical boss, which is embedded in the hole of the valve body 6. The outer circle of the cylindrical boss matches the hole of the valve body 6.

[0046] The valve inlet hole 19 on the end face of the cylindrical boss serves as the valve port. An external threaded sleeve 1 is fitted onto the outer circumference of the valve seat 2. One end of the external threaded sleeve 1 has a thread, and the other end has an external hexagonal shape. The external threaded sleeve 1 is screwed into the internal thread at the end of the valve body 6. Tightening the external threaded sleeve 1 secures the valve seat 2, thus fastening the valve seat 2 to the valve body 6. The valve ball 3, a hardened steel sphere, is placed on the valve port of the valve seat 2. The valve ball 3 is positioned within the axial inner hole of the valve limit 4, which restricts the movement direction of the valve ball 3, allowing it to move only along its axial direction. The spring force generated by the compression of spring 7 acts on valve ball 3 through lower spring seat 16 and valve limit 4. When the force on the lower part of valve ball 3 is greater than the spring force, valve ball 3 moves upward and leaves the valve port. Valve limit 4 moves upward together with valve ball 3. Hydraulic oil overflows from valve port through valve inlet hole 19 of valve seat 2 and is discharged to the outside of valve body 6 through outlet hole 20. A small amount of hydraulic oil enters valve body hole 23 through the fit gap between valve limit 4 and valve body 6, and finally is discharged to the outside of valve body 6 through vertical hole 22 and horizontal hole 21.

[0047] The valve limiter 4 is restricted by the mating hole and can only move axially within the hole. The upper part of the valve limiter 4 is conical, and the lower spring seat 16 has a flared opening along its axis, with the flared opening having an arc cross-section. The lower spring seat 16 is placed above the valve limiter 4, and the conical surface of the valve limiter 4 mates with the arc surface of the flared opening of the lower spring seat 16, serving as a spring self-aligning mechanism. The upper spring seat 8, spring 7, and lower spring seat 16 are located inside the valve body 6. The upper end of the valve body 6 has an internally threaded hole coaxial with the axis of the valve body 6. The opening of the internally threaded hole is provided with a sealing ring groove, and the screw plug 9 is screwed into the internal thread of the valve body 6 for fastening. A third sealing ring 14 is provided in the groove between the valve body 6 and the screw plug 9.

[0048] The valve body 6 has an external hexagonal shape. For example... Figure 2 As shown, the lower end of the valve body 6 is provided with multiple oil outlet holes 20 perpendicular to the axis of the valve body 6, multiple horizontal holes 21, and multiple vertical holes 22 parallel to the axis of the valve body 6. The adjusting bolt 12 is a screw, which is threaded into the screw plug 9. The working height of the spring 7 is adjusted by rotating the adjusting bolt 12. The spring force is changed by changing the installation height of the spring 7, thereby adjusting the opening pressure of the built-in safety valve.

[0049] The built-in safety valve is located at the bottom of the metal diaphragm pump head. After the safety valve is opened, the overflowing hydraulic oil will enter the valve body hole 23. A second sealing ring 10 is provided at the threaded ends of the plug 9.

[0050] The built-in safety valve is part of the hydraulic system of the metal diaphragm metering pump, located on the cylinder 28 of the pump head, see... Figure 3 The outer circle of valve seat 2 mates with the hole in cylinder body 28, and is sealed by the first sealing ring 18 placed on the outer circle of valve seat 2. The outer circle of valve body 6 mates with the hole in cylinder body 28, and is sealed by the fourth sealing ring 5 placed on the outer circle of valve body 6. Hydraulic oil overflowing after the built-in safety valve is opened flows through the cylinder outlet hole 25 and finally into the pump's oil reservoir.

[0051] The valve body 6 with the built-in safety valve has an external thread on its outer circle, which is used to connect with the hydraulic cylinder body 28.

[0052] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in safety valve for a metal diaphragm metering pump, characterized in that, include: Valve seat (2), which is connected to valve body (6) by external threaded sleeve (1); The valve body (6) has a valve body hole (23) inside, and an elastic component is provided inside the valve body hole (23). One side of the elastic component is connected to a valve ball (3) through a valve limiter (4). The valve seat (2) has a valve oil inlet hole (19), and the valve ball (3) is connected to the outlet of the valve oil inlet hole (19). The valve body (6) is provided with an oil outlet hole (20); A screw plug (9) is connected to the side of the valve body (6) away from the valve seat (2). An elastic adjustment component is connected to the screw plug (9). The elastic adjustment component is used to adjust the elasticity of the elastic component.

2. The built-in safety valve for a metal diaphragm metering pump according to claim 1, characterized in that: The valve seat (2) has a groove at its inlet end, and a first sealing ring (18) and a retaining ring (17) are provided inside the groove.

3. The built-in safety valve for a metal diaphragm metering pump according to claim 1, characterized in that: The elastic component includes a spring (7), an upper spring seat (8) and a lower spring seat (16). One end of the spring (7) is connected to the upper spring seat (8), and the other end of the spring (7) is connected to the lower spring seat (16). The lower spring seat (16) is connected to the valve limiter (4). The upper spring seat (8) is connected to the spring adjustment assembly.

4. A built-in safety valve for a metal diaphragm metering pump according to claim 3, characterized in that: The elastic adjustment assembly includes a locking nut (13) and an adjusting bolt (12). The locking nut (13) is fixedly connected to a screw plug (9). The adjusting bolt (12) is threaded through the locking nut (13) and the screw plug (9) and is connected to the upper spring seat (8).

5. A built-in safety valve for a metal diaphragm metering pump according to claim 4, characterized in that: The upper spring seat (8) has a placement groove, and a steel ball (15) is placed inside the placement groove. The steel ball (15) is connected to the end of the adjusting bolt (12).

6. A built-in safety valve for a metal diaphragm metering pump according to claim 1, characterized in that: The valve body (6) is also provided with residual oil drain holes, and there are multiple residual oil drain holes. One end of the residual oil drain hole is connected to the valve body hole (23).

7. A built-in safety valve for a metal diaphragm metering pump according to claim 6, characterized in that: The residual oil drain hole includes a vertical hole (22) and a horizontal hole (21), the vertical hole (22) and the horizontal hole (21) are connected, and the vertical hole (22) is connected to the valve body hole (23).

8. A built-in safety valve for a metal diaphragm metering pump according to claim 1, characterized in that: A safety cap (11) is connected to the screw plug (9), and a second sealing ring (10) is provided between the safety cap (11) and the screw plug (9); A third sealing ring (14) is provided between the screw plug (9) and the valve body (6).

9. A built-in safety valve for a metal diaphragm metering pump according to claim 1, characterized in that: A fourth sealing ring (5) is provided on the valve body (6).

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