High-pressure needle valve with accurate measurement function

Abstract

The utility model relates to a high-pressure needle valve capable of accurately measuring, which relates to the technical field of valves and comprises a valve body used for bearing parts. The valve rod is arranged on the valve body in a threaded mode and used for driving the sealing piece to ascend and descend. The valve needle is arranged on the valve rod and used for controlling the flow of fluid; the calibration piece is arranged on the valve rod and used for visually observing the lifting height of the valve needle so that the flow can be better and accurately controlled, when the valve rod drives the valve needle to move up and down, the distance of the calibration piece driven by the valve rod to move up and down can be observed so that the distance of the valve needle moving upwards can be further accurately controlled, and the flow can be accurately controlled. Therefore, the flow of the fluid can be better controlled.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valves, in particular to a high-pressure needle valve with precise measurement. BACKGROUND

[0002] The high-pressure needle valve is a precision control valve specially designed for high pressure, high temperature and corrosive medium. Its core function is to move the needle valve core up and down by rotating the valve stem to change the opening between the valve seat and the valve core, thereby accurately controlling the medium flow. As a precision fluid control element, the cooperation precision of the needle tip and the valve seat directly determines the sealing performance and adjustment performance.

[0003] At present, the Chinese utility model patent application with the publication number CN 218207821U and the publication date of January 3, 2023 provides a novel needle valve, which comprises a valve handle, a connecting seat and a valve seat. The connecting seat is sealingly welded on the connecting port at the top of the valve seat. The valve stem and the pressure plate are embedded in the connecting seat. One end of the valve stem is locked and fixed with the valve handle, and the other end is fixed on the top end disc of the pressure plate through a screw. A rotating rod is connected to the low end disc of the pressure plate. One end of the rotating rod is locked and fixed with the low end disc of the pressure plate through a screw, and the other end is connected with a needle valve body. The needle valve body is fixed with the rotating rod through a screw. A packing is nested on the rod body between the rotating rod and the needle valve body. The needle valve body of the needle valve adopts a rod type conical valve body. This way, the flow passage can be completely sealed, and the stability of the rotating rod as a whole is also ensured. A sealing ring made of PEEK material is arranged between the needle valve body and the packing, which ensures the sealing effect and reduces the resistance generated during the rotation of the valve body.

[0004] The novel needle valve in the related art cannot accurately observe the opening size of the needle valve, so the flow rate of the needle valve cannot be accurately controlled. In addition, after long-term use, the needle of the needle valve is impacted and worn, which causes deviation in the control of the medium flow rate. The wear condition of the needle of the needle valve cannot be intuitively felt, and the manual adjustment method cannot meet the fine control of the flow rate of the needle valve.

[0005] Therefore, it is necessary to provide a high-pressure needle valve with precise measurement to solve the above problems. CONTENT OF THE UTILITY MODEL

[0006] The application embodiment provides a high-pressure needle valve with precise measurement, in order to solve the technical problem that the opening size of the needle valve cannot be accurately observed in the related art, so the flow rate of the needle valve cannot be accurately controlled.

[0007] The application embodiment provides a high-pressure needle valve with precise measurement, which comprises:

[0008] The valve body is used for bearing parts;

[0009] A valve rod is arranged on the valve body in a threaded manner to drive the seal up and down;

[0010] A valve needle is arranged on the valve rod to control the flow of fluid;

[0011] A calibration piece is arranged on the valve rod to visually observe the lifting height of the valve needle and control the flow size;

[0012] The calibration piece comprises:

[0013] A connecting pipe is arranged on the valve body;

[0014] A positioning nut is sleeved on the connecting pipe and is in threaded rotation connection with the connecting pipe;

[0015] A protective sleeve is slidably sleeved in the valve needle;

[0016] A measuring rod is arranged on the valve rod with one end penetrating through the valve needle and the other end penetrating through the protective sleeve.

[0017] The technical scheme has at least the following technical effects: in the process of using the needle valve to control the flow, the user can further accurately control the upward movement distance of the valve needle by observing the upward movement distance of the calibration piece driven by the valve rod, thereby better controlling the flow of fluid.

[0018] In some embodiments, an abutting column is arranged on the upper end of the valve needle, and the end of the abutting column away from the valve needle is fixedly connected with the valve rod.

[0019] In some embodiments, a sealing ring is sleeved on the abutting column.

[0020] In some embodiments, a protective sleeve is movably sleeved on the outer wall of the measuring rod, the protective sleeve is sealingly inserted into the valve body, one end of the protective sleeve is fixedly connected with the positioning nut, and the other end of the protective sleeve is slidably sleeved in the valve needle and the abutting column.

[0021] In some embodiments, a valve seat is arranged on the valve body and is movably and sealingly connected with the valve needle.

[0022] In some embodiments, a scale is arranged on the measuring rod.

[0023] In some embodiments, a water inlet and a water outlet are arranged on the valve body, and a rotating handle is arranged on the valve rod. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 A three-dimensional structure schematic diagram of a precise measuring high-pressure needle valve is provided in the embodiments of the present application;

[0025] Fig. 2 A cross-sectional structure schematic diagram of a precise measurement high-pressure needle valve provided by the embodiment of the present application is provided.

[0026] Fig. 3 A cross-sectional structure schematic diagram of a calibration piece provided by the embodiment of the present application is provided.

[0027] In the drawings, various reference signs represent:

[0028] 1, valve body; 11, rotating handle; 12, valve seat; 13, valve needle; 14, water inlet; 15, water outlet; 16, valve rod; 17, abutting column; 2, calibration piece; 21, positioning nut; 22, protective sleeve; 23, measuring rod; 24, connecting pipe; 3, sealing ring. DETAILED DESCRIPTION

[0029] Based on this, in order to improve the technical problem that the opening size of the needle valve cannot be accurately observed in the related art, thereby the flow of the needle valve cannot be accurately controlled, the embodiment of the present application provides the following scheme.

[0030] Please refer to Figs. 1-3 , the embodiment of the present application provides a precise measurement high-pressure needle valve, the precise measurement high-pressure needle valve includes a valve body 1 for bearing parts; a valve rod 16 threadedly arranged on the valve body 1 for driving the sealing member to rise and fall; a valve needle 13 arranged on the valve rod 16 for controlling the flow of fluid; a calibration piece 2 arranged on the valve rod 16 for visually observing the lifting height of the valve needle 13, thereby better accurately controlling the flow size, the valve body 1 is provided with a water inlet 14 and a water outlet 15, the valve rod 16 is provided with a rotating handle 11, the valve body 1 is provided with a valve seat 12, and the valve seat 12 is in movable sealing connection with the valve needle 13.

[0031] In some embodiments, please refer to Figs. 1-3 , the calibration piece 2 includes a connecting pipe 24 arranged on the valve body 1, a positioning nut 21 sleeved on the connecting pipe 24 and threadedly connected with the connecting pipe, and a measuring rod 23 having one end penetrating through the valve needle 13 and arranged on the valve rod 16 and the other end movably penetrating through the connecting pipe 24 and the positioning nut 21, the valve needle 13 is provided with an abutting column 17 on the upper end, the end of the abutting column 17 away from the valve needle 13 is fixedly connected with the valve rod 16, a sealing ring 3 is sleeved on the abutting column 17, a protective sleeve 22 is movably sleeved on the outer wall of the measuring rod 23, one end of the protective sleeve 22 is fixedly connected with the positioning nut 21, a sliding groove is formed in the valve needle 13 and the abutting column 17, and the other end of the protective sleeve 22 is slidably sleeved in the sliding groove.

[0032] Thus, before using the needle valve, rotate the top rotating handle 11, and the rotating handle 11 drives the valve rod 16 and the needle valve to descend, and the valve rod 16 drives the measuring rod 23 to fall at the same time. When the valve needle 13 is sealed and matched with the valve seat 12, rotate the calibration positioning nut 21 on the connecting pipe 24 to move up and down on the valve body 1 to the zero scale of the measuring rod 23. The protective sleeve 22 is used to prevent the measuring rod 23 from being damaged by the medium impact, and also plays a sealing effect. When the medium enters from the water inlet 14, rotate the top rotating handle 11. At this time, the scale measuring rod 23 moves upward in the protective sleeve 22 relative to the positioning nut 21. The moving distance of the valve needle 13 is the scale displayed on the measuring rod 23. After a long time of use, due to the wear of the valve needle 13, the scale when the valve needle 13 completely falls to the bottom will be smaller than the initial scale. The measuring rod 23 is marked with positive and negative scales. At this time, it can be recalibrated, or the wear degree can be understood according to the negative scale number at this time, and the valve needle 13 can be replaced according to the situation. In this way, through the scale measuring rod 23, the operator can directly see the moving distance of the valve needle 13, so as to accurately control the flow. This visual adjustment method is more scientific and accurate than the traditional adjustment by hand feeling or experience. The scale of the measuring rod 23 can reflect the position change of the valve needle 13 in real time. The operator can accurately adjust the flow according to the scale, avoid excessive adjustment or insufficient adjustment, and rotate the top rotating handle 11. The lifting operation of the valve rod 16 and the valve needle 13 becomes simple and intuitive, and the operator can complete the adjustment of the valve without complex tools or equipment. After initial installation or replacement of the valve needle 13, the calibration can be quickly completed by rotating the calibration positioning nut 21 to the zero scale of the measuring rod 23. This design makes the initial setting and recalibration of the valve very convenient. The valve needle 13 and the valve seat 12 are connected by movable sealing, which ensures good sealing during the lifting of the valve needle 13. Even in high-pressure or corrosive medium working conditions, leakage can also be effectively prevented. The protective sleeve 22 not only prevents the measuring rod 23 from being damaged by the medium impact, but also plays a sealing role, further enhancing the overall sealing performance of the valve. The measuring rod 23 is marked with positive and negative scales, which can directly show the wear degree of the valve needle 13. When the valve needle 13 is worn, the scale when it completely falls to the bottom will be smaller than the initial scale. The operator can understand the wear condition through the negative scale number. This design enables the operator to discover the wear of the valve needle 13 in advance and timely calibration or replacement, avoiding the sealing failure or inaccurate flow control caused by excessive wear of the valve needle 13, and prolonging the service life of the valve. Since the wear problem of the valve needle 13 can be discovered and handled in time, this design can effectively prolong the overall service life of the needle valve and reduce the frequency of equipment replacement and maintenance cost.

[0033] The implementation principle of the precise measurement high-pressure needle valve is as follows: before use, first rotate the top rotating handle 11, the rotating handle 11 drives the valve rod 16 and the needle valve to descend through threads, the valve rod 16 drives the measuring rod 23 to fall at the same time, when the valve needle 13 is sealed and matched with the valve seat 12, rotate the calibration positioning nut 21 on the connecting pipe 24, and make it move up and down on the valve body 1 to the zero scale of the measuring rod 23, the protective sleeve 22 is used to prevent the measuring rod 23 from being damaged by medium impact, and also has a sealing effect, when the medium enters from the water inlet 14, rotate the top rotating handle 11, at this time, the scale measuring rod 23 moves upward in the protective sleeve 22 relative to the positioning nut 21, the moving distance of the valve needle 13 is the scale displayed on the measuring rod 23, after long-term use, because the valve needle 13 is worn, the scale when the valve needle 13 completely falls to the bottom is smaller than the initial scale, the measuring rod 23 is marked with positive and negative scales, at this time, the valve needle 13 can be calibrated again, or the wear degree can be understood according to the negative scale number, and the valve needle 13 is replaced according to the situation.

[0034] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A precision measured high pressure needle valve, characterized by, Including: Valve body (1) for bearing parts; Valve stem (16) threaded on the valve body (1) for driving the seal up and down; Valve needle (13) provided on the valve stem (16) for controlling the flow of fluid; Calibration (2) provided on the valve stem (16) for visual observation of the lifting height of the valve needle (13) to control the flow size; The calibration (2) comprises: Connecting pipe (24) provided on the valve body (1); Positioning nut (21) sleeved on the connecting pipe (24) and threaded with the connecting pipe (24); Protective sleeve (22) slidingly sleeved in the valve needle (13); Measuring rod (23) one end through the valve needle (13) provided on the valve stem (16), the other end through the protective sleeve (22).

2. A precision measured high pressure needle valve as claimed in claim 1, wherein: The upper end of the valve needle (13) is provided with an abutting column (17), and the end away from the valve needle (13) is fixedly connected with the valve stem (16).

3. A precision measured high pressure needle valve as claimed in claim 2, wherein: The abutting column (17) is sleeved with a sealing ring (3).

4. A precision measuring high pressure needle valve as claimed in claim 3, wherein: The outer wall of the measuring rod (23) is movably sleeved with a protective sleeve (22), the protective sleeve (22) is sealingly inserted with the valve body (1), one end of the protective sleeve (22) is fixedly connected with the positioning nut (21), and the other end of the protective sleeve (22) is slidingly sleeved in the valve needle (13) and the abutting column (17).

5. A precision measuring high pressure needle valve as claimed in claim 4, wherein: The valve body (1) is provided with a valve seat (12), and the valve seat (12) is movably and sealingly connected with the valve needle (13).

6. A precision measuring high pressure needle valve as claimed in claim 5, wherein: The measuring rod (23) is provided with a scale.

7. A precision measuring high pressure needle valve as claimed in claim 6, wherein: The valve body (1) is provided with a water inlet (14) and a water outlet (15), and the valve stem (16) is provided with a rotating handle (11).

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