Control valve of nitrogen recovery equipment

Abstract

The utility model relates to the technical field of nitrogen recovery equipment components, and discloses a control valve of nitrogen recovery equipment, which comprises a valve seat, the valve seat comprises a metal seat body, one end in the metal seat body is provided with a front cavity, the other end in the metal seat body is provided with a rear cavity, and the front cavity and the rear cavity are communicated. An opening is formed in the bottom end of the front cavity, a front filter is installed at the opening in a threaded mode, an opening is formed in one side of the top end of the rear cavity, and a valve element assembly is installed at the opening in a threaded mode. According to the front filtering mechanism with the valve element structure, the front cavity is formed in one end in the valve seat, and the front filter is arranged in the front cavity, so that nitrogen flow passing through the front filtering mechanism can be filtered, impurity particles in the nitrogen flow are filtered out, and the impurity particles are prevented from falling into the valve element structure along with the nitrogen flow; abrasion of the sealing face of the valve element structure is reduced, the sealing performance is improved, and the situation that a small amount of nitrogen is leaked when the valve is closed is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of nitrogen recovery equipment components, specifically a control valve for a nitrogen recovery equipment. Background Technology

[0002] There are various types of control valves for nitrogen recovery equipment, including pressure control valves, specifically pressure reducing valves such as the YQD-5 nitrogen pressure reducing valve. These valves can reduce and stabilize the inlet pressure of nitrogen within a certain range, ensuring stable pressure downstream of the valve. Pressure reducing valves in nitrogen recovery equipment include direct-acting and pilot-operated types. The direct-acting type primarily relies on the spring force of an adjusting spring to balance the inlet and outlet pressures.

[0003] The control valves of existing nitrogen recovery equipment still have the following problems when in use: they have a certain internal leakage problem in terms of sealing performance. That is, after impurities and particles are embedded between the valve core and the valve seat, the wear of the sealing surface is accelerated, which will lead to a small amount of nitrogen leakage even when the valve is closed, affecting the efficiency and purity of nitrogen recovery. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a control valve for a nitrogen recovery device, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a control valve for a nitrogen recovery device, comprising a valve seat, the valve seat comprising a metal body, a front cavity being provided at one end of the metal body, and a rear cavity being provided at the other end of the metal body, the front cavity and the rear cavity being connected, the bottom end of the front cavity being open and a pre-filter being threadedly installed at the opening, the top side of the rear cavity being open and a valve core assembly being threadedly installed at the opening, the pre-filter comprising a first threaded connecting seat threadedly connected to the bottom opening of the front cavity, a filter cover being threadedly connected to the center of the top of the first threaded connecting seat, the top of the filter cover sealing the junction of the front cavity and the rear cavity, the filter cover having multiple air inlet slots at equal angles on its periphery, and an exhaust slot being provided at the top of the filter cover, the exhaust slot being connected to the rear cavity, and a filter element being slidably fitted inside the filter cover.

[0008] As a further embodiment of this utility model: the valve core assembly includes a second threaded connection seat threadedly connected to the top opening of the rear cavity, an adjustment knob is provided at the upper end of the second threaded connection seat, a valve core is provided at the bottom end of the adjustment knob, the valve core is rotatably assembled in the rear cavity, and a spring is assembled between the valve core and the adjustment knob.

[0009] As a further improvement of this utility model, each of the two ends of the metal base is threaded with a connecting end.

[0010] As a further embodiment of this utility model: an assembly groove is provided on the other side of the top of the rear cavity, and a pressure gauge is threadedly installed in the assembly groove. The pressure gauge includes an instrument detection seat threadedly connected in the assembly groove, and an instrument panel is provided on the top of the instrument detection seat.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, a pre-filter mechanism with a valve core structure is provided. A pre-cavity is provided at one end of the valve seat, and a pre-filter is provided in the pre-cavity. It can filter the nitrogen gas flow and filter the impurity particles in it, so as to prevent the impurity particles from falling into the valve core structure with the air flow, reduce the wear of the valve core structure sealing surface, improve the sealing performance, and avoid the situation that nitrogen still leaks a small amount when the valve is closed.

[0013] 2. In this utility model, by adopting an installation mechanism design that facilitates maintenance, the bottom end of the front cavity of the valve seat is open, and the pre-filter is threadedly installed at the bottom opening. The top side of the rear cavity of the valve seat also has an opening, and the valve core assembly is threadedly installed inside it. At the same time, the other side of the top of the rear cavity has an assembly groove, and the pressure gauge is threadedly installed inside it. The pre-filter, valve core assembly and pressure gauge are all easy to inspect, maintain and replace regularly, which can ensure the sealing effect of the overall control valve. Attached Figure Description

[0014] Figure 1 This is a perspective view of the entire utility model;

[0015] Figure 2 This is a perspective view of the valve seat and connecting end of this utility model;

[0016] Figure 3 This is a perspective view of the pre-filter of this utility model;

[0017] Figure 4 This is a perspective view of the valve core assembly of this utility model;

[0018] Figure 5 This is a three-dimensional view of the pressure gauge of this utility model.

[0019] In the diagram: 1. Valve seat; 2. Connecting end; 3. Pre-filter; 4. Valve core assembly; 5. Pressure gauge; 11. Metal seat; 12. Pre-cavity chamber; 13. Rear cavity; 14. Assembly slot; 31. First threaded connection seat; 32. Filter cover; 33. Filter element; 34. Inlet slot; 35. Exhaust slot; 41. Second threaded connection seat; 42. Adjustment knob; 43. Valve core; 44. Spring; 51. Instrument detection seat; 52. Instrument panel. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Please see Figures 1-5In this embodiment of the present invention, a control valve for a nitrogen recovery device includes a valve seat 1, which includes a metal seat 11. A front chamber 12 is provided at one end of the metal seat 11, and a rear chamber 13 is provided at the other end of the metal seat 11. The front chamber 12 and the rear chamber 13 are connected. The bottom end of the front chamber 12 is open, and a pre-filter 3 is threadedly installed at the opening. One side of the top end of the rear chamber 13 has an opening, and a valve core assembly 4 is threadedly installed at the opening. The pre-filter 3 includes a first threaded connector 31 threadedly connected to the bottom opening of the front chamber 12. A filter cover 32 is threadedly connected to the center of the top end of the first threaded connector 31. The top end of the filter cover 32 closes the junction between the front chamber 12 and the rear chamber 13. Multiple inlets are opened at equal angles on the periphery of the filter cover 32. The filter cover 32 has an exhaust groove 35 at its top, which is connected to the rear chamber 13. The filter cover 32 has a filter element 33 that is slidably fitted inside it. The entire structure is a pre-filter mechanism with a valve core 43. A pre-chamber 12 is set at one end of the valve seat 1. A pre-filter 3 is set in the pre-chamber 12. The nitrogen gas flow enters through the air inlet groove 34 and is filtered by the filter element 33 to remove impurities. The filtered gas flow enters the rear chamber 13 through the exhaust groove 35. The pre-filter 3 can filter the nitrogen gas flow and remove impurities, preventing impurities from falling into the valve core 43 structure with the gas flow. This reduces the wear of the sealing surface of the valve core 43 structure, improves the sealing performance, and prevents a small amount of nitrogen from leaking when the valve is closed.

[0024] Valve core assembly 4 includes a second threaded connector 41 threadedly connected to the top opening of the rear cavity 13. An adjustment knob 42 is located at the upper end of the second threaded connector 41, and a valve core 43 is located at the bottom end of the adjustment knob 42. The valve core 43 is rotatably mounted within the rear cavity 13. A spring 44 is installed between the valve core 43 and the adjustment knob 42. When the medium enters the valve cavity (rear cavity 13) from the air inlet, it exerts an upward pressure on the valve core 43. Without external force, the valve core 43 is in a closed or partially closed state under the elastic force of the spring 44. The valve core 43 is adjusted by the adjustment knob 42. Button 42 compresses spring 44, causing spring 44 to exert a downward force on valve core 43. This force and the intake pressure form a balance relationship on valve core 43. When the intake pressure increases, the upward force of valve core 43 increases, compressing spring 44 and increasing the opening of valve core 43. More medium flows through valve core 43 to the outlet. Due to the change in the opening of valve core 43, the outlet pressure is kept near the set value. Conversely, when the intake pressure decreases, spring 44 forces valve core 43 to move downward, reducing the opening of valve core 43 and reducing the medium flow, thus maintaining a stable outlet pressure.

[0025] Each of the two ends of the metal base 11 is connected to a threaded end 2. The overall pressure reducing control valve can be connected to the nitrogen delivery pipeline of the nitrogen recovery equipment through the two end connections 2.

[0026] An assembly groove 14 is provided on the other side of the top of the rear cavity 13. A pressure gauge 5 is installed in the assembly groove 14. The pressure gauge 5 includes an instrument detection seat 51 threadedly connected to the assembly groove 14. An instrument panel 52 is provided on the top of the instrument detection seat 51. The pressure gauge 5 can monitor the gas pressure data in the rear cavity 13.

[0027] The working principle of this utility model is as follows: The overall pressure reducing control valve can be connected to the nitrogen delivery pipeline of the nitrogen recovery equipment through the connecting ends 2 on both sides. It is equipped with a pre-filter mechanism with a valve core 43 structure. A pre-cavity 12 is provided at one end of the valve seat 1, and a pre-filter 3 is installed in the pre-cavity 12. The nitrogen gas flow enters through the inlet groove 34, filters impurities through the filter element 33, and finally the filtered gas flow enters the rear cavity 13 through the exhaust groove 35. When the medium enters the valve cavity (rear cavity 13) from the inlet, it exerts an upward pressure on the valve core 43. Without external force, the valve core 43 is held in place by the spring 44. Under the elastic force, the valve core 43 is in a closed or partially closed state. By adjusting the knob 42 to compress the spring 44, the spring 44 applies a downward force to the valve core 43. This force and the intake pressure form a balance relationship on the valve core 43. When the intake pressure increases, the upward force of the valve core 43 increases, compressing the spring 44 and increasing the opening of the valve core 43. More medium flows through the valve core 43 to the outlet. Due to the change in the opening of the valve core 43, the outlet pressure is kept near the set value. Conversely, when the intake pressure decreases, the spring 44 forces the valve core 43 to move downward, reducing the opening of the valve core 43 and reducing the medium flow, thus maintaining a stable outlet pressure.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A control valve for a nitrogen recovery device, comprising a valve seat (1), the valve seat (1) comprising a metal seat body (11), a front cavity (12) being provided at one end of the metal seat body (11), and a rear cavity (13) being provided at the other end of the metal seat body (11), the front cavity (12) and the rear cavity (13) being connected in a communication manner; Its features are: The bottom of the front chamber (12) is open and a pre-filter (3) is threadedly installed at the opening. The top side of the rear chamber (13) is provided with an opening and a valve core assembly (4) is threadedly installed at the opening. The pre-filter (3) includes a first threaded connector (31) threadedly connected to the bottom opening of the pre-cavity (12), and a filter cover (32) is threadedly connected to the center of the top of the first threaded connector (31). The top of the filter cover (32) closes the junction between the front cavity (12) and the rear cavity (13). The filter cover (32) has multiple air inlet slots (34) at equal angles on its periphery. The top of the filter cover (32) has an exhaust slot (35). The exhaust slot (35) is connected to the rear cavity (13). A filter element (33) is slidably fitted inside the filter cover (32).

2. The control valve of the nitrogen recovery equipment according to claim 1, characterized in that: The valve core assembly (4) includes a second threaded connector (41) that is threaded to the top opening of the rear cavity (13).

3. The control valve of a nitrogen recovery device according to claim 2, characterized in that: The second threaded connector (41) is provided with an adjustment knob (42) at its upper end, and a valve core (43) is provided at the bottom end of the adjustment knob (42).

4. The control valve of the nitrogen recovery equipment according to claim 3, characterized in that: The valve core (43) is rotatably mounted in the rear cavity (13), and a spring (44) is mounted between the valve core (43) and the adjustment knob (42).

5. The control valve of a nitrogen recovery device according to claim 1, characterized in that: Each of the two ends of the metal base (11) is threaded with a connecting end (2).

6. The control valve of a nitrogen recovery device according to claim 1, characterized in that: An assembly groove (14) is provided on the other side of the top of the rear cavity (13), and a pressure gauge (5) is installed in the internal thread of the assembly groove (14).

7. The control valve of a nitrogen recovery device according to claim 6, characterized in that: The pressure gauge (5) includes a gauge test seat (51) threaded into the assembly groove (14), and a gauge plate (52) is provided at the top of the gauge test seat (51).

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