Pneumatic throttle valve

Abstract

The pneumatic throttle valve comprises a valve body and an adjusting rod, a valve cavity is formed in the valve body, an air inlet and an air outlet which are communicated with the valve cavity are formed in the valve body, the air inlet is communicated to the valve cavity through a valve port, the adjusting rod is movably arranged in the valve cavity, and the adjusting rod moves in the axial direction to open and close the valve port. A conical section part correspondingly matched with the valve port is arranged at the bottom of the adjusting rod, the conical section part extends into the valve port, and a sealing ring is arranged between the conical section part and the valve port, so that when the valve port is closed by the adjusting rod, the sealing ring is flexibly and hermetically arranged between the conical section part and the valve port in an abutting manner. The sealing ring is arranged between the adjusting rod and the valve port, when the adjusting rod closes the valve port, the sealing ring flexibly abuts against the portion between the conical section part and the valve port in a sealed mode, rigid contact between the valve port and the conical section part of the adjusting rod is avoided, and therefore deformation of the valve port due to extrusion of the adjusting rod is avoided. The cut-off function of the throttling valve in the closed state is guaranteed, and meanwhile flow speed adjustment is more accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic accessory technical field, especially pneumatic throttle valve. BACKGROUND

[0002] The throttle valve is the valve that controls fluid flow by changing the throttle section or the throttle length. The throttle valve and the check valve are connected in parallel to combine into the check throttle valve, and the throttle valve and the check throttle valve are simple flow control valves. Since the flow of the throttle valve depends on the size of the throttle port area, the area of the throttle port is usually adjusted to achieve throttling.

[0003] For example, a pneumatic throttle valve is disclosed in Chinese utility model patent (publication number: CN208535176U), which comprises a valve body, a valve sleeve, an adjusting rod and a valve core. The valve sleeve is sleeved on the outer wall of the valve body. The valve body is provided with an air inlet. The valve sleeve is provided with an air outlet. The valve sleeve is provided with a connecting channel communicating with the air inlet and the air outlet. The valve body is provided with a valve core at the air inlet. The center of the valve core is provided with an air inlet hole. The bottom of the adjusting rod is conical. The bottom of the adjusting rod penetrates the valve sleeve and extends into the air inlet hole. The valve sleeve is provided with an adjusting cap. The adjusting cap extends into the valve sleeve and is connected with the top of the adjusting rod. The inner wall of the adjusting cap is provided with a limiting tooth. The outer periphery of the valve sleeve is provided with a limiting groove matched with the limiting tooth. In use, gas enters from the air inlet, passes through the air inlet hole and the connecting channel, and is discharged from the air outlet. When the exhaust flow needs to be adjusted, the adjusting cap is rotated. The adjusting cap drives the adjusting rod to rotate, and then the adjusting rod moves in the valve sleeve, so as to change the length of the bottom of the adjusting rod extending into the air inlet hole, change the cross-sectional area of the air inlet hole, and adjust the exhaust flow. When the exhaust flow is adjusted to the appropriate value, the adjusting cap is pressed in the direction of the valve sleeve, so that the limiting tooth is clamped in the limiting groove, thereby limiting the adjusting cap. The cap is no longer rotated, so as to lock the adjusting rod.

[0004] However, the above-mentioned prior art discloses a pneumatic throttle valve, which has the following defects: the conical end of the adjusting rod is in rigid contact with the air inlet hole of the valve core. In the use process, the adjusting rod will extrude the port of the air inlet hole of the valve core, causing wear of the port of the air inlet hole of the valve core. Not only will this cause inaccurate flow regulation, but also will cause the part to be unable to achieve complete sealing and blocking, so that the throttle valve cannot achieve the cutoff function.

[0005] Therefore, it is necessary to improve the prior art. UTILITY MODEL CONTENTS

[0006] The utility model discloses a pneumatic throttle valve which can solve the problem of the prior art that the conical end of the adjusting rod and the air inlet hole of the valve core are in rigid contact, and the end of the air inlet hole of the valve core is pressed by the adjusting rod during use, causing wear of the end of the air inlet hole of the valve core, inaccurate flow rate adjustment, and even complete sealing of the part cannot be achieved, so that the throttle valve cannot achieve the cut-off function.

[0007] To achieve the above object, the utility model adopts the following technical scheme:

[0008] A pneumatic throttle valve, comprising a valve body and an adjusting rod, the valve body is provided with a valve cavity, the valve body is provided with an air inlet and an air outlet which are communicated with the valve cavity, the air inlet is communicated with the valve cavity through a valve port, the adjusting rod is movably arranged in the valve cavity, and the adjusting rod moves along the axial direction to open and close the valve port.

[0009] Further, the sealing ring is an O-shaped sealing ring, and the O-shaped sealing ring is sleeved on the outside of the conical section.

[0010] Further, the conical section is provided with an annular groove, and the O-shaped sealing ring is embedded in the annular groove.

[0011] Further, a nut is fixedly arranged in the valve cavity, and the adjusting rod is threadedly connected with the nut.

[0012] Further, the upper end of the valve body is provided with a digital display assembly, the digital display assembly comprises a screw cap, an upper valve cover, a numerical scale disc and a lower valve cover, the lower valve cover is fixedly connected to the valve body, the numerical scale disc is rotatably connected to the lower valve cover, the upper valve cover is arranged on the numerical scale disc, the upper valve cover is fixedly connected to the lower valve cover, numerical scales are arranged on the outer wall of the numerical scale disc in the circumferential direction, the upper valve cover is provided with a display gap for displaying the numerical scales, the screw cap is fixedly connected to the adjusting rod, and the numerical scale disc is drivingly connected to the adjusting rod.

[0013] Further, the inner wall of the numerical scale disc is provided with a clamping groove in the circumferential direction, the upper end of the adjusting rod is provided with a convex rib which is clamped and matched with the clamping groove, and the numerical scale disc is rotatably connected to the adjusting rod through the matching of the convex rib and the clamping groove.

[0014] Further, the inner wall of the numerical scale disc is divided into a plurality of arc surfaces by the clamping groove, and the lower valve cover is provided with a convex circle which is matched with the arc surfaces.

[0015] Further, the rotating cap is provided with a flat slot, and the upper end of the adjusting rod is provided with a flat connecting end which is rotationally connected with the flat slot.

[0016] Further, the rotating cap and the upper valve cover are provided with a locking structure, the locking structure comprises a first limiting tooth and a convex ring arranged on the upper valve cover, and a second limiting tooth and a convex block arranged on the rotating cap, the rotating cap is provided with an elastic arm, and the convex block is arranged on the lower end of the elastic arm; when the convex block is in clamping cooperation with the convex ring, the first limiting tooth is in meshing cooperation with the second limiting tooth; when the convex block is out of clamping cooperation with the convex ring, the first limiting tooth is out of meshing cooperation with the second limiting tooth.

[0017] Further, the bottom end of the valve body is provided with a valve sleeve, and a one-way sealing ring is arranged between the valve sleeve and the valve body.

[0018] After the above structure is adopted, the pneumatic throttle valve has the following beneficial effects:

[0019] (1) The pneumatic throttle valve comprises a valve body and an adjusting rod, a valve cavity is arranged in the valve body, an air inlet and an air outlet which are communicated with the valve cavity are arranged on the valve body, the air inlet is communicated with the valve cavity through a valve port, the adjusting rod is movably arranged in the valve cavity, the adjusting rod moves along the axial direction to open or close the valve port, a tapered section part which is correspondingly matched with the valve port is arranged at the bottom of the adjusting rod, the tapered section part extends into the valve port, and a sealing ring is arranged between the tapered section part and the valve port, so that when the adjusting rod closes the valve port, the sealing ring is flexibly and tightly arranged between the tapered section part and the valve port. The sealing ring is arranged between the adjusting rod and the valve port, when the adjusting rod closes the valve port, the sealing ring is flexibly and tightly arranged between the tapered section part and the valve port, rigid contact between the valve port and the tapered section part of the adjusting rod is avoided, deformation of the valve port caused by extrusion of the tapered section part of the adjusting rod is avoided, the cut-off function of the throttle valve in the closed state is ensured, and flow rate regulation is more accurate.

[0020] (2) The upper end of the valve body is provided with a digital display assembly. By arranging the digital display assembly on the throttle valve, when the user rotates the rotating cap, the digital display assembly displays the numerical scale of the current throttle valve flow signal, so that the user can accurately adjust the throttle valve according to the numerical scale displayed. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application, the following will briefly introduce the drawings needed in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0022] Figure 1 is the whole structure schematic view of the utility model;

[0023] Figure 2 is the whole structure sectional view of the utility model;

[0024] Figure 3 is the whole structure of the utility model Figure 2 the structure enlarged schematic view of A place of;

[0025] Figure 4 is the whole structure explosion view of the utility model;

[0026] Figure 5 is the three-dimensional schematic view of the adjusting rod of the utility model;

[0027] Figure 6 is the sectional view of the valve body of the utility model;

[0028] Figure 7 is the three-dimensional schematic view of the upper valve cover of the utility model;

[0029] Figure 8 is the three-dimensional schematic view of the cap of the utility model;

[0030] Figure 9 is the three-dimensional schematic view of the numerical scale dial of the utility model;

[0031] Figure 10 is the three-dimensional schematic view of the lower valve cover of the utility model;

[0032] Figure 11 is the cooperation connection schematic view of the numerical scale dial and the lower valve cover of the utility model.

[0033] Figures 1 to 11 the reference numerals are:

[0034] 1, valve body;11, valve cavity;12, air inlet;13, gas outlet;14, valve port;2, adjusting rod;21, conical section part;211, annular groove;22, convex rib;23, flat connection end;3, O-shaped sealing ring;4, nut;5, digital display assembly;51, cap;511, flat groove;512, elastic arm;52, upper valve cover;521, display gap;53, numerical scale dial;531, numerical scale;532, clamping groove;533, arc surface;54, lower valve cover;541, convex circle;6, locking structure;61, first limiting tooth;62, second limiting tooth;63, convex ring;64, convex block;7, valve sleeve;71, air inlet through hole;8, one-way sealing ring. DETAILED DESCRIPTION

[0035] In order to make the above object, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of the term "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the utility model, unless another definite provision and limitation, if there is first feature on second feature "on" or "under" and similar description, its meaning can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature "on", "above" and "on" second feature can be first feature directly above or obliquely above second feature, or just indicate first feature horizontal height higher than second feature. First feature "under", "below" and "on" second feature can be first feature directly below or obliquely below second feature, or just indicate first feature horizontal height less than second feature.

[0040] It should be noted that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for purposes of explanation only and are not intended to be limiting.

[0041] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0042] As shown in Figures 1 to 11 A kind of pneumatic throttle valve, including valve body 1 and adjusting rod 2, the valve cavity 11 is provided in the valve body 1, the valve body 1 is equipped with with valve cavity 11 communication inlet 12 and outlet 13, the inlet 12 is communicated to valve cavity 11 by valve port 14, the adjusting rod 2 is movably arranged in valve cavity 11, adjusting rod 2 moves along axial direction to open and close valve port 14, the adjusting rod 2 bottom is equipped with with the corresponding cooperation of the taper section 21 of valve port 14, the taper section 21 extends into valve port 14, sealing ring is arranged between the taper section 21 and valve port 14, so that when adjusting rod 2 closes the valve port 14, the sealing ring is flexibly and sealingly set between the taper section 21 and valve port 14.

[0043] Based on the above embodiment, the utility model wants to solve is provided a kind of pneumatic throttle valve, including valve body 1 and adjusting rod 2, the valve body 1 is provided with valve cavity 11, the valve body 1 is equipped with with valve cavity 11 communication's air inlet 12 and air outlet 13, the air inlet 12 is connected to valve cavity 11 by valve port 14, the adjusting rod 2 is movably arranged in valve cavity 11, adjusting rod 2 moves along the axial direction to open and close valve port 14, the adjusting rod 2 bottom is provided with the taper section 21 of corresponding cooperation with valve port 14, the taper section 21 is inserted into valve port 14, sealing ring is arranged between the taper section 21 and valve port 14, so that when adjusting rod 2 closes the valve port 14, the sealing ring is flexibly and sealingly arranged between the taper section 21 and valve port 14. It is arranged between adjusting rod 2 and valve port 14 with sealing ring, when adjusting rod 2 closes the valve port 14, the sealing ring is flexibly and sealingly arranged between the taper section 21 and valve port 14, avoid the rigid contact of valve port 14 and the taper section 21 of adjusting rod 2, in turn avoid the deformation of valve port 14 due to the extrusion of the taper section 21 of adjusting rod 2, guarantee the cut-off function of throttle valve in closed state, also make flow rate regulation more accurate.

[0044] As another preferred scheme of the utility model, the sealing ring is O-shaped sealing ring 3, and the O-shaped sealing ring 3 is sleeved on the outside of the taper section 21. The taper section 21 is provided with an annular groove 211, and the O-shaped sealing ring 3 is embedded in the annular groove 211. In the embodiment, as shown in Figure 3 And Figure 4 the sealing ring is O-shaped sealing ring 3, and the O-shaped sealing ring 3 is sleeved on the outside of the taper section 21. When the adjusting rod 2 closes the valve port 14, the sealing ring is flexibly and sealingly arranged between the taper section 21 and valve port 14, avoiding the deformation of valve port 14 due to the extrusion of the taper section 21 of adjusting rod 2, guaranteeing the cut-off function of the throttle valve in the closed state, and also making the flow rate regulation more accurate. The design of the annular groove 211 improves the reliability of the installation of the O-shaped sealing ring 3, and avoids the displacement of the O-shaped sealing ring 3 when being extruded. In other preferred embodiments, the sealing ring can also be arranged at the port of the valve port 14, and can also play a buffering role, improve the protection of the valve port 14, and then improve the reliability of the cut-off of the throttle valve and improve the adjustment accuracy.

[0045] As another preferred scheme of the utility model, the valve cavity 11 is fixedly provided with a nut 4, and the adjusting rod 2 is threadedly connected with the nut 4. In the embodiment, as shown in Figure 2As shown, by setting the nut 4 threaded with the adjusting rod 2, the adjusting rod 2 can be moved up and down relative to the nut 4 when the adjusting rod 2 is rotated, and then the adjusting rod 2 is moved up and down relative to the valve port 14, so as to change the cross-sectional area of the intake air, and meet the functions of opening and closing the throttle valve and regulating the flow rate. Specifically, when the adjusting rod 2 moves upward, the cross-sectional area of the intake air at the valve port 14 increases, and the air flow entering increases; when the adjusting rod 2 moves downward, the cross-sectional area of the intake air at the valve port 14 decreases, and the air flow entering decreases.

[0046] As another preferred embodiment of the utility model, the upper end of the valve body 1 is provided with a digital display assembly 5, the digital display assembly 5 includes screw cap 51, upper valve cover 52, numerical scale disc 53 and lower valve cover 54, the lower valve cover 54 is fixedly connected to the valve body 1, the numerical scale disc 53 is rotatably connected to the lower valve cover 54, the upper valve cover 52 is covered on the numerical scale disc 53, the upper valve cover 52 is fixedly connected with the lower valve cover 54, the numerical scale disc 53 is provided with numerical scale 531 along the circumference of the outer wall, the upper valve cover 52 is provided with display gap 521 for displaying numerical scale 531, the screw cap 51 is fixedly connected with the adjusting rod 2, the numerical scale disc 53 is drivingly connected with the adjusting rod 2. The inner wall of the numerical scale disc 53 is provided with clamping groove 532 along the circumference, the upper end of the adjusting rod 2 is provided with convex rib 22 matched with clamping groove 532, the numerical scale disc 53 is drivingly connected with the adjusting rod 2 through the matching of convex rib 22 and clamping groove 532. The inner wall of the numerical scale disc 53 is divided into several arc surfaces 533 by clamping groove 532, the lower valve cover 54 is provided with convex circle 541 matched with arc surface 533. The screw cap 51 is provided with flat groove 511, the upper end of the adjusting rod 2 is provided with flat connecting end 23 rotationally connected with flat groove 511. The screw cap 51 and the upper valve cover 52 are provided with locking structure 6, the locking structure 6 includes first limiting teeth 61 and convex ring 63 arranged on the upper valve cover 52, second limiting teeth 62 and convex block 64 arranged on the screw cap 51, the screw cap 51 is provided with elastic arm 512, the convex block 64 is arranged at the lower end of the elastic arm 512; when the convex block 64 and the convex ring 63 are matched, the first limiting teeth 61 and the second limiting teeth 62 are engaged, when the convex block 64 and the convex ring 63 are disengaged, the first limiting teeth 61 and the second limiting teeth 62 are disengaged.

[0047] In the embodiment, as shown in Figure 1 and Figure 4 By setting the digital display assembly 5 on the throttle valve, when the user rotates the screw cap 51, the digital display assembly 5 displays the numerical scale 531 of the current throttle valve flow signal, so that the user can accurately adjust the throttle valve according to the current numerical scale 531.

[0048] In the embodiment, as shown in Figure 7 and Figure 8 , the upper valve cover 52 is provided with a first limiting tooth 61, and the cap 51 is provided with a second limiting tooth 62 engaged with the first limiting tooth 61. When the user adjusts to the appropriate exhaust flow, the cap 51 is pressed downward, so that the first limiting tooth 61 is engaged with the second limiting tooth 62, at this time, the convex ring 63 will stretch the elastic arm 512, so that the convex block 64 is over the convex ring 63 and is limited by the convex ring 63, thereby locking the cap 51, avoiding the cap 51 from being undesirably rotated, causing errors, and ensuring the stability of the exhaust flow. When the exhaust flow needs to be adjusted, the cap 51 is only needed to be pulled up, so that the first limiting tooth 61 is disengaged from the second limiting tooth 62, and the cap 51 can be rotated again. In the embodiment, as shown in Figure 5 and Figure 8 , the adjusting rod 2 is rotationally connected with the cap 51 through the cooperation of the flat connecting end 23 and the flat groove 511. When the user rotates the cap 51, the adjusting rod 2 rotates synchronously with the cap 51.

[0049] In the embodiment, as shown in Figure 9 and Figure 11 , the inner wall of the numerical scale disc 53 is provided with a clamping groove 532 in the circumferential direction, and the convex rib 22 on the adjusting rod 2 is matched with the clamping groove 532. When the user rotates the cap 51, the adjusting rod 2 rotates, and the convex rib 22 rotates, and when the convex rib 22 rotates to abut against the recess of the clamping groove 532, the convex rib 22 pushes the clamping groove 532 in the numerical scale disc 53, so that the numerical scale disc 53 rotates by one step, and the numerical value displayed in the display gap 521 changes. Specifically, when the user rotates the cap 51, the numerical scale 531 displayed in the display gap 521 changes synchronously. In this way, the user can observe the numerical scale 531 in the display gap 521 to understand the current flow signal of the throttle valve, and the throttle valve can be precisely adjusted by the user.

[0050] In the embodiment, as shown in Figure 10 and Figure 11 , the lower valve cover 54 is provided with a convex circle 541 matched with the arc surface 533. The convex circle 541 abuts against the arc surface 533 to limit the rotation of the numerical scale disc 53, thereby avoiding errors caused by the undesired rotation of the numerical scale disc 53. Meanwhile, when the adjusting rod 2 is rotated, the convex circle 541 and the arc surface 533 cooperate to generate a gear feeling, thereby improving the experience of the user during adjustment.

[0051] As another preferred scheme of the utility model, the bottom end of the valve body 1 is provided with a valve sleeve 7, and a one-way sealing ring 8 is arranged between the valve sleeve 7 and the valve body 1. The valve sleeve 7 is provided with an air inlet through hole 71 corresponding to the air inlet 12 of the valve body 1. In the embodiment, as shown in Figure 2 andFigure 3 As shown, the outer side wall of the valve body 1 is sleeved with a one-way sealing ring 8 in Y-shaped cross section, and the outer edge of the one-way sealing ring 8 is abutted against the inner wall of the valve sleeve 7, so as to prevent the reverse flow or leakage of the gas flow.

[0052] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A pneumatic throttle valve, comprising a valve body (1) and an adjusting rod (2), a valve cavity (11) is arranged in the valve body (1), an air inlet (12) and an air outlet (13) are arranged on the valve body (1) and communicate with the valve cavity (11), the air inlet (12) communicates with the valve cavity (11) through a valve port (14), the adjusting rod (2) is movably arranged in the valve cavity (11), and the adjusting rod (2) moves in the axial direction to open and close the valve port (14), a tapered section (21) corresponding to the valve port (14) is arranged at the bottom of the adjusting rod (2), and the tapered section (21) extends into the valve port (14), characterized in that: The sealing ring is arranged between the tapered section (21) and the valve port (14) to be flexible and sealed against the tapered section (21) and the valve port (14) when the adjusting rod (2) closes the valve port (14). ​ 2. A pneumatic throttle valve according to claim 1, characterized in that: The sealing ring is an O-shaped sealing ring (3) which is sleeved on the outside of the tapered section (21).

3. A pneumatic throttle valve according to claim 2, characterized in that: The tapered section (21) is provided with an annular groove (211) in which the O-shaped sealing ring (3) is embedded.

4. A pneumatic throttle valve according to claim 1, characterized in that: The valve cavity (11) is fixedly provided with a nut (4), and the adjusting rod (2) is threadedly connected with the nut (4).

5. A pneumatic throttle valve according to claim 1, characterized in that: The upper end of the valve body (1) is provided with a digital display assembly (5), the digital display assembly (5) comprises a screw cap (51), an upper valve cover (52), a numerical scale disc (53) and a lower valve cover (54), the lower valve cover (54) is fixedly connected to the valve body (1), the numerical scale disc (53) is rotatably connected to the lower valve cover (54), the upper valve cover (52) is arranged on the numerical scale disc (53), the upper valve cover (52) and the lower valve cover (54) are fixedly connected, the outer wall of the numerical scale disc (53) is provided with numerical scales (531) in the circumferential direction, the upper valve cover (52) is provided with a display gap (521) for displaying the numerical scales (531), the screw cap (51) is fixedly connected with the adjusting rod (2), and the numerical scale disc (53) is in transmission connection with the adjusting rod (2).

6. A pneumatic throttle valve according to claim 5, characterized in that: The inner wall of the numerical scale disc (53) is provided with a clamping groove (532) in the circumferential direction, the upper end of the adjusting rod (2) is provided with a convex rib (22) in clamping cooperation with the clamping groove (532), and the numerical scale disc (53) is in transmission connection with the adjusting rod (2) through cooperation of the convex rib (22) and the clamping groove (532).

7. A pneumatic throttle valve according to claim 6, characterized in that: The inner wall of the numerical scale disc (53) is divided into a plurality of arc surfaces (533) by the clamping groove (532), and the lower valve cover (54) is provided with convex circles (541) in cooperation with the arc surfaces (533).

8. A pneumatic throttle valve according to claim 5, characterized in that: The screw cap (51) is provided with a flat groove (511), and the upper end of the adjusting rod (2) is provided with a flat connecting end (23) in rotation-stopping connection with the flat groove (511).

9. A pneumatic throttle valve according to claim 5, characterized in that: The screw cap (51) and the upper valve cover (52) are provided with a locking structure (6), the locking structure (6) comprises first limiting teeth (61) and a convex ring (63) arranged on the upper valve cover (52), and second limiting teeth (62) and a convex block (64) arranged on the screw cap (51), the screw cap (51) is provided with an elastic arm (512), and the convex block (64) is arranged at the lower end of the elastic arm (512); when the convex block (64) is in clamping cooperation with the convex ring (63), the first limiting teeth (61) and the second limiting teeth (62) are in meshing cooperation, and when the convex block (64) is disengaged from the clamping cooperation with the convex ring (63), the first limiting teeth (61) and the second limiting teeth (62) are disengaged from the meshing cooperation.

10. A pneumatic throttle valve according to claim 1, characterized in that: The bottom end of the valve body (1) is provided with a valve sleeve (7), and a one-way sealing ring (8) is arranged between the valve sleeve (7) and the valve body (1).

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