A high-precision pneumatic control valve for a differential pressure type detector

Abstract

The embodiment of the application provides a high-precision air control valve for a differential pressure type detector, relates to the technical field of air control valves, and comprises a valve body, a containing cavity is arranged in the valve body, and an air inlet, a first air outlet and a second air outlet are formed outside the valve body; the valve body further comprises a valve rod which is movably arranged in the containing cavity; an elastic assembly is connected between the bottom of the valve rod and the bottom of the containing cavity; two sealing parts are arranged on the valve rod; a plugging part is arranged on the valve rod and located between the two sealing parts; the valve body is further provided with airflow stabilizing channels which are in communication with the corresponding first air outlet, second air outlet and air inlet; the sealing part comprises a main sealing ring arranged on a circumferential boss of the valve rod and an auxiliary sealing ring located on the two axial sides of the main sealing ring; and the main sealing ring and the auxiliary sealing ring jointly form an axial sliding seal with the inner wall of the containing cavity. The application has the effects of improving sealing efficiency and detection precision.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic control valve technology, and in particular to a high-precision pneumatic control valve for differential pressure detectors. Background Technology

[0002] Differential pressure gauges are key equipment in industry used to test the sealing performance of workpieces. They determine leakage by comparing the pressure difference between the tested workpiece and a reference component. The pneumatic control valve, as the core switching component of the differential pressure testing pneumatic circuit system, directly affects the accuracy of the test results.

[0003] Chinese patent CN220037519U discloses a pneumatic control valve for a differential pressure detector, which improves accuracy by setting a sealing part to keep the volume of the sealed cavity constant when the valve stem moves.

[0004] The proposed solution still has the following shortcomings:

[0005] 1. Its sealing structure is relatively simple, relying on only a single sealing ring, and wear after long-term use can easily lead to seal failure;

[0006] 2. The single-spring return mechanism may not operate smoothly under complex working conditions;

[0007] 3. Local turbulence may be generated in the airflow channel, affecting the overall detection accuracy. Utility Model Content

[0008] To address the aforementioned technical problems, this application provides a high-precision pneumatic control valve for differential pressure detectors.

[0009] This application provides a high-precision pneumatic control valve for a differential pressure detector, employing the following technical solution: A high-precision pneumatic control valve for a differential pressure detector includes a valve body, within which a receiving cavity is provided. The valve body has an air inlet, a first air outlet, and a second air outlet communicating with the receiving cavity. The first air outlet is located between the second air outlet and the air inlet. The valve also includes a valve stem, movably disposed within the receiving cavity; an elastic component connected between the bottom of the valve stem and the bottom of the receiving cavity; and two sealing portions disposed on the valve stem. The valve body is provided with a blocking component, which is disposed on the valve stem and located between the two sealing parts. The valve body is also provided with an airflow stabilizing channel corresponding to the first air outlet, the second air outlet and the air inlet. The sealing part includes a main sealing ring disposed on the circumferential boss of the valve stem and auxiliary sealing rings located on both sides of the main sealing ring in the axial direction. The main sealing ring and the auxiliary sealing rings together form an axial sliding seal with the inner wall of the accommodating cavity. The elastic component includes a base, a sliding seat and an elastic element connecting the base and the sliding seat. The lower end of the valve stem abuts against the sliding seat.

[0010] Furthermore, the upper end of the sliding seat is provided with a positioning groove to facilitate the positioning of the valve stem end. The elastic element includes several fixed cylinders fixed on the base, a sliding rod passing through the fixed cylinder and slidably connected to the fixed cylinder, the upper end of the sliding rod being fixed on the sliding seat, and a spring being provided inside the fixed cylinder to push the sliding rod upward.

[0011] Furthermore, the bottom of the valve body is provided with a mounting groove, and a mounting block is threaded into the mounting groove, with the sliding seat connected to the mounting block.

[0012] Furthermore, the inner walls of the channels connecting the air inlet, the first air outlet, and the second air outlet to the accommodating cavity are all provided with rounded chamfers.

[0013] Furthermore, the airflow stabilizing channel is connected to the air inlet, the first air outlet and the second air outlet respectively. The inner wall of the airflow stabilizing channel is provided with spiral guide ridges. The opening of the airflow stabilizing channel gradually expands from the air inlet direction to the air outlet direction of the air inlet, the first air outlet and the second air outlet.

[0014] Furthermore, the blocking component is a rubber sleeve fitted onto the valve stem.

[0015] Furthermore, the rubber sleeve is made of fluororubber, and its sealing contact area is a spherical curved surface.

[0016] Furthermore, magnetic switches are embedded on the outer side of the valve body corresponding to the upper and lower limit positions of the valve stem, respectively, and a magnetic ring that cooperates with the magnetic switches is fixed on the valve stem.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] Improved sealing performance: The sealing part includes a main sealing ring and auxiliary sealing rings located on both sides of the main sealing ring along the axial direction. Compared with the single sealing ring in the existing technology, this multi-seal structure can better ensure the sealing effect, reduce the sealing failure caused by wear after long-term use, and improve the reliability and service life of the pneumatic control valve.

[0019] Ensuring smooth operation: The elastic component includes a base, a sliding seat, and an elastic element. The elastic element consists of a fixed cylinder, a sliding rod, and a spring, with the lower end of the valve stem abutting against the sliding seat. Compared to a single-spring reset mechanism, this structure provides a more stable reset force under complex operating conditions, ensuring the smoothness of the valve stem's movement, thereby ensuring the normal operation of the pneumatic control valve and the accuracy of the test results.

[0020] Improved detection accuracy: The valve body is equipped with an airflow stabilization channel, whose inner wall has spiral guiding ridges, and the cross-section gradually increases from the air inlet direction to the air outlet direction. At the same time, the inner wall of the channel connecting the air inlet, air outlet and the receiving cavity has rounded chamfers. These designs can effectively reduce local turbulence in the airflow channel, making the airflow more stable, thereby improving the detection accuracy of the differential pressure detector.

[0021] Easy to install and adjust: The bottom of the valve body has an installation groove with a mounting block threaded into it. The base is connected to the mounting block, which facilitates the installation and disassembly of the elastic component and also makes it easy to adjust the spring force acting on the valve stem to adapt to different working conditions.

[0022] It has a position detection function: magnetic switches are embedded on the outside of the valve body corresponding to the upper and lower limit positions of the valve stem, and a magnetic ring that cooperates with the magnetic switches is fixed on the valve stem. It can accurately detect the position of the valve stem, which provides convenience for the control and monitoring of the pneumatic valve and helps to further improve the working performance and detection accuracy of the pneumatic valve. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the overall structure from another perspective of an embodiment of this application.

[0025] Figure 3 This is a cross-sectional view of an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. First air outlet; 3. Second air outlet; 4. Air inlet; 5. Airflow stabilizing channel; 6. Main sealing ring; 7. Auxiliary sealing ring; 8. Base; 9. Sliding seat; 10. Fixed cylinder; 11. Sliding rod; 12. Mounting block; 13. Valve stem. Detailed Implementation

[0027] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0030] This application discloses a high-precision pneumatic control valve for a differential pressure detector, referring to... Figure 1 , Figure 2 and Figure 3 The valve includes a valve body 1, which has a accommodating cavity inside. The valve body 1 has an air inlet 4, a first air outlet 2, and a second air outlet 3 connected to the accommodating cavity. The first air outlet 2 is located between the second air outlet 3 and the air inlet 4. The pneumatic control valve also includes a valve stem 13 that is slidably disposed in the accommodating cavity and can move up and down in the accommodating cavity; an elastic component connected between the bottom of the valve stem 13 and the bottom of the accommodating cavity; two sealing parts disposed on the valve stem 13; and a blocking component disposed on the valve stem 13 between the two sealing parts. The valve body 1 is also provided with an airflow stabilizing channel 5 that connects the first air outlet 2, the second air outlet 3, and the air inlet 4.

[0031] Initial state (when not in operation):

[0032] When the valve stem 13 is in the upper position under the action of the elastic component, the blocking component is located above the second air outlet 3 and is not blocked. At this time, the first air outlet 2 and the second air outlet 3 are directly connected to form a bypass air passage.

[0033] Operating state (when valve stem 13 moves downward):

[0034] When valve stem 13 moves downward, the elastic component is compressed, and the blocking component moves downward with valve stem 13, completely sealing the second air outlet 3. The air inlet 4 is connected to the first air outlet 2, forming the main air passage.

[0035] Reference Figure 2 and Figure 3 The blocking component includes a rubber sleeve fitted onto the valve stem 13. The rubber sleeve is made of fluororubber, and its sealing contact area is a spherical curved surface.

[0036] Reference Figure 2 and Figure 3 The elastic component includes a base 8, a sliding seat 9, and an elastic element connecting the base 8 and the sliding seat 9. The lower end of the valve stem 13 abuts against the sliding seat 9. The upper end of the sliding seat 9 is provided with a positioning groove to facilitate the positioning of the end of the valve stem 13. The elastic element includes several fixed cylinders 10 fixed on the base 8 and a sliding rod 11 passing through the fixed cylinders 10. The sliding rod 11 is slidably connected to the fixed cylinders 10. The upper end of the sliding rod 11 is fixed on the sliding seat 9. A spring is provided in the fixed cylinders 10 to push the sliding rod 11 to move upward. The bottom of the valve body 1 is provided with an installation groove. An installation block 12 is threadedly connected in the installation groove. The base 8 is connected to the installation block 12, which facilitates the installation and disassembly of the elastic component and also facilitates the adjustment of the elastic force of the spring acting on the valve stem 13.

[0037] Reference Figure 2 and Figure 3 The inner walls of the channels connecting the air inlet 4, the first air outlet 2, and the second air outlet 3 to the accommodating cavity are all provided with rounded chamfers. The airflow stabilizing channel 5 is connected to the air inlet 4, the first air outlet 2, and the second air outlet 3 respectively. The inner wall of the airflow stabilizing channel 5 is provided with spiral guiding ridges, and the opening of the airflow stabilizing channel 5 gradually expands from the air inlet 4, the first air outlet 2, and the second air outlet 3 in the air inlet direction to the air outlet direction. The airflow stabilizing channel 5 is designed to improve the stability of the airflow and reduce the possibility of local turbulence.

[0038] Reference Figure 1 and Figure 2 Magnetic switches are embedded on the outer side of the valve body 1, corresponding to the upper and lower limit positions of the valve stem 13, respectively. A magnetic ring that cooperates with the magnetic switches is fixed on the valve stem 13. In practice, an electromagnet can be used as the magnetic switch.

[0039] The above are merely preferred embodiments of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included within the protection scope recorded in the claims.

Claims

1. A high-precision pneumatic control valve for a differential pressure detector, comprising a valve body (1), wherein a receiving cavity is provided inside the valve body (1), and an air inlet (4), a first air outlet (2), and a second air outlet (3) communicating with the receiving cavity are opened outside the valve body (1), wherein the first air outlet (2) is located between the second air outlet (3) and the air inlet (4); further comprising a valve stem (13), which is movably disposed in the receiving cavity; an elastic component connected between the bottom of the valve stem (13) and the bottom of the receiving cavity; two sealing parts disposed on the valve stem (13); and a blocking component disposed on the valve stem (13) and located between the two sealing parts; characterized in that The valve body (1) is also provided with an airflow stabilizing channel (5) corresponding to the first air outlet (2), the second air outlet (3) and the air inlet (4). The sealing part includes a main sealing ring (6) disposed on the circumferential boss of the valve stem (13) and auxiliary sealing rings (7) located on both sides of the main sealing ring (6) in the axial direction. The main sealing ring (6) and the auxiliary sealing rings (7) together form an axial sliding seal with the inner wall of the accommodating cavity. The elastic component includes a base (8), a sliding seat (9) and an elastic element connecting the base (8) and the sliding seat (9). The lower end of the valve stem (13) abuts against the sliding seat (9).

2. The high-precision air control valve for a differential pressure type detector according to claim 1, characterized by: The upper end of the sliding seat (9) is provided with a positioning groove to facilitate the positioning of the valve stem (13) end. The elastic element includes several fixed cylinders (10) fixed on the base (8) and a sliding rod (11) passing through the fixed cylinder (10) and slidably connected to the fixed cylinder (10). The upper end of the sliding rod (11) is fixed on the sliding seat (9). A spring is provided in the fixed cylinder (10) to push the sliding rod (11) to move upward.

3. The high-precision air control valve for differential pressure type detectors according to claim 2, characterized in that: The valve body (1) has an installation groove at the bottom, and an installation block (12) is threaded into the installation groove. The sliding seat (9) is connected to the installation block (12).

4. The high-precision air control valve for a differential pressure type detector according to claim 1, characterized by: The inner walls of the channels connecting the air inlet (4), the first air outlet (2), and the second air outlet (3) to the accommodating cavity are all provided with rounded chamfers.

5. The high precision gas control valve for differential pressure type detector according to claim 1, characterized in that: The airflow stabilizing channel (5) is connected to the air inlet (4), the first air outlet (2) and the second air outlet (3) respectively. The inner wall of the airflow stabilizing channel (5) is provided with spiral guiding ridges, and the opening of the airflow stabilizing channel (5) gradually expands from the air inlet (4), the first air outlet (2) and the second air outlet (3) towards the air outlet.

6. The high precision gas control valve for differential pressure type detector according to claim 1, characterized in that: The blocking component is a rubber sleeve fitted onto the valve stem (13).

7. The high-precision air control valve for differential pressure type detectors according to claim 6, characterized in that: The rubber sleeve is made of fluororubber, and its sealing contact part is a spherical curved surface.

8. The high precision gas control valve for differential pressure type detector according to claim 1, characterized in that: Magnetic switches are respectively embedded on the outer side of the valve body (1) corresponding to the upper and lower limit positions of the valve stem (13), and a magnetic ring that cooperates with the magnetic switches is fixed on the valve stem (13).

Images