Zero-leakage pneumatic control valve

Abstract

The utility model relates to a zero-leakage pneumatic control valve, which comprises a valve body, a valve cover, a cylinder, a valve seat, a valve rod, a valve core, a valve cage, a shaft sleeve and a locking screw, the valve cage is provided with an upper ring part, a lower ring part and a central part which are coaxially distributed, the upper ring part is clamped between the valve body and the valve cover, and the valve seat is clamped between the lower ring part and the valve body. The valve seat is connected between the valve body and the lower ring portion of the valve cage in a clamped mode, the upper ring portion of the valve cage is connected between the valve body and the valve cover in a clamped mode, a clamping type fixing structure is adopted, the valve cover and the valve body only need to be fixedly connected, the valve cover and the valve body can be fixed, and therefore the valve cover and the valve body can be fixed. Therefore, the problem of looseness of the valve seat is effectively avoided, and the valve can still operate stably under the environment of high pressure, vibration or temperature change.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of governing valve, especially a zero leakage pneumatic governing valve. BACKGROUND

[0002] In the design and manufacture of pneumatic governing valve, the connection mode of valve body and valve core is one of the key factors affecting the sealing performance and service life of valve, the pneumatic governing valve is provided with a valve seat at the contact position of valve body and valve core, and the valve seat is used for sealing connection instead of valve body and valve core, the structure is not high in requirement for the casting precision of valve body and is suitable for batch production, however, the traditional valve body usually fixes the valve seat through the threaded connection mode, the structure is simple, but obvious defects exist in actual use, the threaded connection is easy to loosen due to the continuous force and vibration of valve rod on the valve seat in frequent movement, the sealing property between valve seat and valve body is reduced, and then the medium leakage problem is caused. SUMMARY

[0003] In order to overcome the defects in the background art, the utility model adopts the technical scheme of a zero leakage pneumatic governing valve, which comprises a valve body, a valve cover, a cylinder, a valve seat, a valve rod and a valve core, the valve body is connected with the cylinder for controlling the movement of the valve rod through the valve cover, the valve body is provided with an inlet channel and an outlet channel, the valve body is provided with the valve seat between the inlet channel and the outlet channel, the upper part of the valve rod is slidably connected to the valve cover through a water seal, and the bottom of the valve rod is provided with the valve core for plugging the valve seat, further comprising a valve cage, a shaft sleeve and a locking screw, the valve cage is provided with coaxially distributed upper ring, lower ring and center part, the upper ring is clamped between the valve body and the valve cover, the valve seat is clamped between the lower ring and the valve body, the center part is threadedly connected with the shaft sleeve through the locking screw, and the lower part of the valve rod is slidably connected to the shaft sleeve.

[0004] The valve seat is clamped between the valve body and the lower ring of the valve cage, and the upper ring of the valve cage is clamped between the valve body and the valve cover, a clamping type fixing structure is adopted, the valve seat can be fixed only by fixing the valve cover and the valve body, the loosening problem of the valve seat is effectively avoided, and the valve can still operate stably under high pressure, vibration or temperature change environment.

[0005] The utility model is further provided with reinforcing ribs for connecting the upper ring, the lower ring and the center part of the valve cage, and channels for medium flow are formed between adjacent reinforcing ribs.

[0006] The valve cage adopts an integrated casting structure, the upper ring, the lower ring, the center part and the reinforcing ribs form an integral structure, the integral structure has high strength and can withstand higher hydraulic pressure and impact.

[0007] The utility model is further provided with springs between the valve cage and the valve seat, and the lower ring is circumferentially provided with blind holes for installing the springs.

[0008] The spring compensation structure is arranged between the valve cage and the valve seat to solve the sealing problem caused by installation error and thermal expansion and cold contraction, and to avoid local leakage.

[0009] The valve body is provided with a first step portion and a second step portion for mounting the valve cage and the valve seat, the valve cover is provided with a protruding portion for pressing the valve cage, and the valve body is provided with a mounting hole for bolt connection of the valve cover.

[0010] Further, the first sealing ring is arranged between the upper ring portion, the first step portion and the protruding portion, and the second sealing ring is arranged between the valve cage and the second step portion.

[0011] The positioning effect of the step portion and the sealing effect of the sealing ring are used to further optimize the connection structure of the valve body, the valve cover and the valve cage, so as to improve the structural stability.

[0012] The center portion is provided with a third step portion for limiting the shaft sleeve, the center portion and the shaft sleeve are combined to form a threaded hole, and the locking screw locks the shaft sleeve and the valve cage through the threaded hole.

[0013] The shaft sleeve is fixed by the locking screw, so that the shaft sleeve is prevented from being deviated relative to the center portion during movement of the valve rod, and the stability of the valve rod movement is improved.

[0014] The valve cover and the cylinder are provided with a scale bar, and the valve rod is provided with a pointer corresponding to the scale bar.

[0015] The scale bar is used to indicate the opening degree of the valve, so that the valve opening degree is visualized, and the convenience and the adjustment accuracy of the valve operation are improved.

[0016] The embodiments of the utility model will be further described below with reference to the drawings. DRAWINGS

[0017] Figure 1 It is a sectional view of the utility model;

[0018] Figure 2 It is a sectional view of the utility model; Figure 1 It is a local enlarged view of the sectional view of the utility model;

[0019] Figure 3 It is a perspective view of the valve cage of the utility model;

[0020] Figure 4 It is a sectional view of the valve body of the utility model;

[0021] Figure 5 It is a sectional view of the utility model;Figure 1 Enlarged view of a portion of the view of Fig. 1 ;

[0022] Wherein: 1 - valve body, 2 - valve cover, 3 - cylinder, 4 - valve seat, 5 - valve rod, 6 - valve core, 7 - water seal, 8 - inlet channel, 9 - outlet channel, 10 - valve cage, 11 - shaft sleeve, 12 - locking screw, 13 - upper ring part, 14 - lower ring part, 15 - center part, 16 - reinforcing rib, 18 - spring, 19 - blind hole, 20 - first step part, 21 - second step part, 22 - protruding part, 23 - mounting hole, 24 - first sealing ring, 25 - second sealing ring, 26 - third step part, 27 - threaded hole, 28 - scale bar, 29 - pointer; DETAILED DESCRIPTION

[0023] As shown in Figure 1 , 2 , the embodiment provides a zero leakage pneumatic control valve, which comprises a valve body 1, a valve cover 2, a cylinder 3, a valve seat 4, a valve rod 5, a valve core 6 and a water seal 7, the valve body 1 is connected with the cylinder 3 for controlling the movement of the valve rod 5 through the valve cover 2, the valve body 1 is provided with an inlet channel 8 and an outlet channel 9, the valve body 1 is provided with the valve seat 4 between the inlet channel 8 and the outlet channel 9, the upper part of the valve rod 5 is slidably connected to the valve cover 2 through the water seal 7, and the bottom of the valve rod 5 is provided with the valve core 6 for plugging the valve seat 4, further comprising a valve cage 10, a shaft sleeve 11 and a locking screw 12, the valve cage 10 is provided with coaxially distributed upper ring part 13, lower ring part 14 and center part 15, the upper ring part 13 is clamped between the valve body 1 and the valve cover 2, the valve seat 4 is clamped between the lower ring part 14 and the valve body 1, the center part 15 is threadedly connected with the shaft sleeve 11 through the locking screw 12, and the lower part of the valve rod 5 is slidably connected to the shaft sleeve 11.

[0024] In the utility model, the valve seat 4 is clamped between the valve body 1 and the lower ring part 14 of the valve cage 10, and the upper ring part 13 of the valve cage 10 is clamped between the valve body 1 and the valve cover 2, a clamping type fixing structure is adopted, the valve seat 4 can be fixed only by fixedly connecting the valve cover 2 and the valve body 1, the loosening problem of the valve seat 4 is effectively avoided, and stable operation of the valve can be ensured under high pressure, vibration or temperature change environment.

[0025] As shown in Figure 3 , in the embodiment, the valve cage 10 is provided with reinforcing ribs 16 for connecting the upper ring part 13, the lower ring part 14 and the center part 15, channels for medium flow are formed between adjacent reinforcing ribs 16, the valve cage 10 adopts an integral casting forming structure, the upper ring part 13, the lower ring part 14, the center part 15 and the reinforcing ribs 16 form an integral structure, the valve cage 10 is provided with springs 18 between the valve seat 4, and the lower ring part 14 is circumferentially provided with blind holes 19 for mounting the springs 18.

[0026] As shown in Figure 4As shown, in the embodiment, the valve body 1 is provided with a first step portion 20 and a second step portion 21 for mounting the valve cage 10 and the valve seat 4, the valve cover 2 is provided with a protruding portion 22 for pressing the valve cage 10, the valve body 1 is connected with the valve cover 2 by bolts, the valve body 1 is provided with a mounting hole 23 for bolt connection of the valve cover 2, a first sealing ring 24 is arranged between the upper ring portion 13, the first step portion 20 and the protruding portion 22, and a second sealing ring 25 is arranged between the valve cage 10 and the second step portion 21.

[0027] In the embodiment, the center portion 15 is provided with a third step portion 26 for limiting the shaft sleeve 11, a threaded hole 27 is formed between the center portion 15 and the shaft sleeve 11, the shaft sleeve 11 is locked with the valve cage 10 by the locking screw 12 through the threaded hole 27, the shaft sleeve 11 is fixed by the locking screw 12, so that the shaft sleeve 11 is prevented from being deviated relative to the center portion 15 during movement of the valve rod 5, and the stability of movement of the valve rod 5 is improved.

[0028] In combination with Figure 5 As shown, in the embodiment, a scale bar 28 is arranged between the valve cover 2 and the cylinder 3, and a pointer 29 corresponding to the scale bar 28 is arranged on the valve rod 5, the scale bar 28 is used for indicating the opening degree of the valve, so that the opening degree of the valve is visualized.

[0029] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A zero-leakage pneumatic control valve, characterized in that, The valve body (1) includes a valve cover (2), a cylinder (3), a valve seat (4), a valve stem (5), and a valve core (6). The valve body (1) is connected to the cylinder (3) via the valve cover (2) for controlling the movement of the valve stem (5). The valve body (1) is provided with an inlet channel (8) and an outlet channel (9). The valve seat (4) is located between the inlet channel (8) and the outlet channel (9). The upper part of the valve stem (5) is slidably connected to the valve cover (2) via a water seal, and the bottom of the valve stem (5) is provided with a valve for blocking the valve seat (4). The core (6) also includes a valve cage (10), a bushing (11) and a locking screw (12). The valve cage (10) is provided with an upper ring (13), a lower ring (14) and a central part (15) distributed coaxially. The upper ring (13) is engaged between the valve body (1) and the valve cover (2). The valve seat (4) is engaged between the lower ring (14) and the valve body (1). The central part (15) is threadedly connected to the bushing (11) by the locking screw (12). The lower part of the valve stem (5) is slidably connected to the bushing (11).

2. The zero-leakage pneumatic regulating valve according to claim 1, characterized in that: The valve cage (10) is provided with reinforcing ribs (16) for connecting the upper ring (13), the lower ring (14) and the center (15), and a channel for medium flow is formed between adjacent reinforcing ribs (16).

3. A zero-leakage pneumatic regulating valve according to claim 2, characterized in that: A spring (18) is provided between the valve cage (10) and the valve seat (4), and the lower ring (14) has blind holes (19) distributed in a circumferential manner for installing the spring (18).

4. A zero-leakage pneumatic regulating valve according to claim 3, characterized in that: The valve body (1) is provided with a first step (20) and a second step (21) for mounting the valve cage (10) and the valve seat (4), the valve cover (2) is provided with a protrusion (22) for pressing the valve cage (10), and the valve body (1) is provided with a mounting hole (23) for bolting the valve cover (2).

5. A zero-leakage pneumatic regulating valve according to claim 4, characterized in that: A first sealing ring (24) is provided between the upper ring (13) and the first step (20) and the protrusion (22), and a second sealing ring (25) is provided between the valve cage (10) and the second step (21).

6. A zero-leakage pneumatic regulating valve according to claim 2, characterized in that: The central part (15) is provided with a third step (26) for limiting the bushing (11). The central part (15) and the bushing (11) are combined to form a threaded hole (27). The locking screw (12) locks the bushing (11) and the valve cage (10) through the threaded hole (27).

7. A zero-leakage pneumatic regulating valve according to claim 1, characterized in that: A scale bar (28) is provided between the valve cover (2) and the cylinder (3), and the valve stem (5) is provided with a pointer (29) corresponding to the scale bar (28).

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