Throttle valve

Abstract

The utility model discloses a throttling valve which comprises a valve body, a valve element and an indicator. The valve body comprises an air inlet channel, a throttling opening and an air outlet channel. The valve element is connected with the valve body and can adjust the opening degree of the throttling opening. The indicator comprises a shell with an air cavity, a transparent cover cap, a piston and a sliding sleeve. The cavity bottom of the air cavity is provided with a first communication port communicated with the air inlet channel, and the cavity wall of the air cavity is provided with a second communication port communicated with the air outlet channel; the piston is located between the first communication port and the second communication port, one end of the sliding sleeve is assembled in the transparent cover in a sliding mode, and a first elastic piece used for driving the piston to move downwards is arranged in the air cavity. A user can judge whether the throttling opening is throttled or not by observing the action of the sliding sleeve, the user can conveniently judge whether the throttling valve is installed reversely or not, the user can conveniently check the fault of the valve element, and the product performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas flow regulating valves, in particular to a throttle valve. Background Art

[0002] In pneumatic systems, throttle valves are used to control the flow of compressed air, and are also called speed control valves. Compressed air flows in from the air inlet, passes through the throttle port, and flows out from the air outlet. By adjusting the flow adjustment hand wheel, the valve core can be moved to change the flow cross-sectional area of ​​the throttle port, thereby achieving the purpose of regulating the flow.

[0003] Usually, the throttle valve is small in size, with a throttle symbol engraved or printed on the surface. The throttle direction is determined by the throttle symbol and then installed. However, when the user does not have professional knowledge of pneumatics or is careless and does not observe the throttle symbol carefully during installation, the throttle valve is often installed upside down, resulting in the outlet not being throttled, causing the end actuator to malfunction.

[0004] The existing throttle valve is also unable to provide feedback on whether the valve core maintains the throttling effect. If the user needs to determine whether the valve core is working normally, he needs to use a barometer, flow meter, etc. to assist in the judgment, which makes troubleshooting inconvenient. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a new type of throttle valve, which is equipped with an indicator. The user can judge whether the throttle port is throttled by observing the movement of the sliding sleeve, and it is also convenient for the user to judge whether the throttle valve is installed upside down, and it is also convenient for the user to check the valve core failure, thereby improving the performance of the product.

[0006] The technical solution of the utility model provides a throttle valve, including a valve body, a valve core and an indicator;

[0007] The valve body comprises an air inlet passage, a throttle port and an air outlet passage which are connected in sequence;

[0008] The valve core is connected to the valve body and can adjust the opening of the throttle port;

[0009] The indicator comprises a housing having an air cavity, a transparent cover connected to the housing and communicating with the air cavity, a piston slidably mounted in the air cavity, and a sliding sleeve connected to the piston;

[0010] The bottom of the air cavity is provided with a first communication port communicating with the air inlet channel, and the wall of the air cavity is provided with a second communication port communicating with the air outlet channel;

[0011] The piston is located between the first communication port and the second communication port, one end of the sliding sleeve is slidably assembled in the transparent cover, and a first elastic member for driving the piston to move downward is provided in the air cavity.

[0012] In one of the optional technical solutions, a guide shaft is provided in the transparent cover, and the sliding sleeve is sleeved with the guide shaft.

[0013] In one of the optional technical solutions, the first elastic member is connected between the guide shaft and the piston.

[0014] In one of the optional technical solutions, a reverse flow port is provided in the valve body below the throttling port, a valve plug is provided below the reverse flow port, and a second elastic member for driving the valve plug to seal the reverse flow port is connected between the valve body and the valve plug.

[0015] In one of the optional technical solutions, one end of the transparent cover is sealed and connected in the air cavity, and the other end of the transparent cover is located outside the air cavity.

[0016] In one of the optional technical solutions, an internal air passage connecting the second communication port and the air outlet passage is provided in the valve body.

[0017] In one of the optional technical solutions, a first sealing ring is provided on the circumferential surface of the piston.

[0018] In one of the optional technical solutions, the housing includes a lower housing connected to the valve body and an upper housing detachably connected to the lower housing;

[0019] The lower end of the transparent cover is provided with a cover flange, and the cover flange is sandwiched between the lower shell and the upper shell.

[0020] In one of the optional technical solutions, a second sealing ring is provided between the lower shell and the upper shell.

[0021] In one of the optional technical solutions, a third sealing ring is provided between the cover flange and the lower shell and / or the upper shell.

[0022] The above technical solution has the following beneficial effects:

[0023] The throttle valve provided by the utility model comprises a valve body, a valve core and an indicator. The valve body comprises an air inlet channel, a throttle port and an air outlet channel which are connected in sequence. The valve core is used to adjust the opening of the throttle port. The indicator comprises a shell, a transparent cover, a piston and a sliding sleeve. The piston is installed in the air cavity of the shell, and the transparent cover seals the top opening of the air cavity. One end of the sliding sleeve is fixedly connected to the piston, and the other end thereof extends into the transparent cover and can slide in the transparent cover. The bottom of the air cavity is connected to the air inlet channel through a first connecting port, and the second connecting port on the cavity wall of the air cavity is connected to the air outlet channel. The piston can slide between the first connecting port and the second connecting port. The first elastic member is assembled in the air cavity and is used to drive the piston to reset downward.

[0024] When the user operates the valve core to reduce the opening of the throttle port, the air pressure in the air outlet channel decreases, so the pressure acting on the top surface of the piston decreases, and the piston drives the sliding sleeve to move upward. When the user operates the valve core to increase the opening of the throttle port, the air pressure in the air outlet channel increases, so the pressure acting on the top surface of the piston increases, and the piston drives the sliding sleeve to move downward.

[0025] The user can observe the movement of the sliding sleeve through the transparent cover to understand whether the valve core is working.

[0026] If the user installs the throttle valve upside down, the air pressure on the first connecting port side is not greater than the air pressure on the second connecting port side, and therefore the air pressure applied to the bottom surface of the piston is not greater than the air pressure applied to the top surface of the piston. Under the action of the gravity of the piston and the elastic force of the first elastic member, no matter how the user operates the valve core, the piston is at the bottom of the air cavity, and the sliding sleeve will not slide upward, which also makes it easy for the user to determine whether the throttle valve is installed upside down. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0028] Figure 1 A cross-sectional view of a throttle valve provided in one embodiment of the utility model;

[0029] Figure 2 for Figure 1 A cross-sectional view of the throttle valve along the AA direction;

[0030] Figure 3 This is a cross-sectional view after the piston drives the sliding sleeve to move upward a certain distance;

[0031] Figure 4 This is a cross-sectional view after the piston drives the sliding sleeve to move upward to the limit position. DETAILED DESCRIPTION

[0032] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings. The same parts are represented by the same figure numbers. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] like Figure 1-4 As shown, a throttle valve provided in an embodiment of the utility model includes a valve body 1 , a valve core 2 and an indicator 3 .

[0034] The valve body 1 comprises an air inlet passage 11, a throttle port 12 and an air outlet passage 13 which are connected in sequence.

[0035] The valve core 2 is connected to the valve body 1 and can adjust the opening of the throttle port 12 .

[0036] The indicator 3 includes a housing 31 having an air cavity 30 , a transparent cover 32 connected to the housing 31 and communicating with the air cavity 30 , a piston 33 slidably mounted in the air cavity 30 , and a sliding sleeve 34 connected to the piston 33 .

[0037] A first communication port 301 communicating with the air inlet passage 11 is formed at the bottom of the air cavity 30 , and a second communication port 302 communicating with the air outlet passage 13 is formed at the wall of the air cavity 30 .

[0038] The piston 33 is located between the first communication port 301 and the second communication port 302, and one end of the sliding sleeve 34 is slidably mounted in the transparent cover 32. A first elastic member 35 is provided in the air cavity 30 for driving the piston 33 to move downward.

[0039] The throttle valve provided by the utility model is mainly used in the pipeline of a pneumatic system.

[0040] The throttle valve provided by the utility model comprises a valve body 1 , a valve core 2 and an indicator 3 .

[0041] An air inlet passage 11, a throttle port 12 and an air outlet passage 13 are provided in the valve body 1, and the air inlet passage 11, the throttle port 12 and the air outlet passage 13 are connected in sequence.

[0042] The valve core 2 is connected to the valve body 1, and the valve core 2 is used to adjust the opening of the throttle port 12. When the opening of the throttle port 12 is large, the amount of air flowing from the air inlet channel 11 into the air outlet channel 13 is large, and the air pressure in the air outlet channel 13 is relatively large. When the opening of the throttle port 12 is small, the amount of air flowing from the air inlet channel 11 into the air outlet channel 13 is small, and the air pressure in the air outlet channel 13 is relatively small.

[0043] The indicator 3 includes a housing 31, a transparent cover 32, a piston 33, a sliding sleeve 34 and a first elastic member 35. The bottom of the housing 31 is connected to the valve body 1, and the housing 31 has an air cavity 30. The bottom of the air cavity 30 is provided with a first communication port 301, and the first communication port 301 is communicated with the air inlet channel 11. The side wall of the air cavity 30 is provided with a second communication port 302, and the second communication port 302 is communicated with the air outlet channel 13. The piston 33 is installed in the air cavity 30, and the piston 33 can slide between the first communication port 301 and the second communication port 302. The transparent cover 32 seals the top opening of the air cavity 30. The transparent cover 32 can be a plastic cover or a tempered glass cover. The lower end of the sliding sleeve 34 is fixedly connected to the piston 33, and the upper end thereof extends into the transparent cover 32 and can slide in the transparent cover 32. The sliding sleeve 34 can be connected with the piston 33 as a whole. The first elastic member 35 is installed in the air cavity 30 to drive the piston 33 to reset downward. When the piston 33 moves upward, it will compress the first elastic member 35, and the first elastic member 35 damps the upward movement of the piston 33. The first elastic member 35 can be a spring, a spring sheet, etc.

[0044] When the air pressure force at the bottom of the piston 33 is greater than the sum of the air pressure force at the top of the piston 33 , the gravity of the piston 33 and the elastic force of the first elastic member 35 , the piston 33 will move upward, thereby driving the sliding sleeve 34 to slide upward.

[0045] When the first elastic member 35 is compressed to a certain extent, the piston 33 can no longer move upward, and thus stays at a certain position in the air cavity 30 .

[0046] When the air pressure force at the bottom of the piston 33 is smaller than the sum of the air pressure force at the top of the piston 33 , the gravity of the piston 33 and the elastic force of the first elastic member 35 , the piston 33 will move downward, and drive the sliding sleeve 34 to slide downward.

[0047] The air pressure in the air inlet channel 11 is greater than the air pressure in the air outlet channel 13. When the opening of the throttle port 12 is small, the air pressure difference between the air inlet channel 11 and the air outlet channel 13 increases, and the pressure difference between the upper and lower surfaces of the piston 33 increases. When the force of the air pressure difference is greater than the sum of the weight of the piston 33 and the elastic force of the first elastic member 35, the piston 33 starts to move upward.

[0048] When the opening of the throttle port 12 is large, the pressure difference between the air inlet channel 11 and the air outlet channel 13 decreases, and the pressure difference acting on the upper and lower surfaces of the piston 33 decreases. When the force of the pressure difference is less than the sum of the gravity of the piston 33 and the elastic force of the first elastic member 35, the piston 33 starts to move downward.

[0049] When the user operates the valve core 2 to reduce the opening of the throttle port 12, the air pressure in the air outlet channel 13 decreases, so the pressure acting on the top surface of the piston 33 decreases, and the piston 33 drives the sliding sleeve 34 to move upward. In this process, the first elastic member 35 is compressed, and the elastic force applied to the top surface of the piston 33 increases until the forces acting on the top and bottom surfaces of the piston 33 are equal, and the piston 33 stops moving.

[0050] When the user operates the valve core 2 to increase the opening of the throttle port 12, the air pressure in the air outlet channel 13 increases, so the pressure acting on the top surface of the piston 33 increases, and the piston 33 drives the sliding sleeve 34 to move downward. In this process, the first elastic member 35 stretches and releases energy, prompting the piston 33 to return downward, and the elastic force of the first elastic member 35 acting on the top surface of the piston 33 gradually decreases.

[0051] The user can observe the movement of the sliding sleeve 34 through the transparent cover 32 and thus understand whether the valve core 2 is functioning.

[0052] If the user installs the throttle valve upside down, the air pressure on the side of the first connecting port 301 is not greater than the air pressure on the side of the second connecting port 302. Therefore, the air pressure applied to the bottom surface of the piston 33 is not greater than the air pressure applied to the top surface of the piston 33. Under the action of the gravity of the piston 33 and the elastic force of the first elastic member 35, no matter how the user operates the valve core 2, the piston 33 is at the bottom of the air cavity 30, and the sliding sleeve 34 will not slide upward, which is also convenient for the user to determine whether the throttle valve is installed upside down.

[0053] As required, the sliding sleeve 34 may be coated with color for the convenience of user observation.

[0054] In one embodiment, if Figure 1-4 As shown, a guide shaft 36 is provided in the transparent cover 32 , and the sliding sleeve 34 is sleeved with the guide shaft 36 .

[0055] The guide shaft 36 can be connected to the transparent cover 32 in one piece or in a separate piece. The upper end of the sliding sleeve 34 is sleeved on the guide shaft 36 , and the guide shaft 36 guides the sliding of the sliding sleeve 34 .

[0056] In one embodiment, if Figure 1-4 As shown, the first elastic member 35 is connected between the guide shaft 36 and the piston 33 .

[0057] In this embodiment, the upper end of the first elastic member 35 abuts against the step at the lower end of the guide shaft 36, and the lower end of the first elastic member 35 abuts against the piston 33, which is convenient for installation. If the guide shaft 36 and the transparent cover 32 are separately provided, the guide shaft 36 can be abutted against the transparent cover 32 by the first elastic member 35 for fixing.

[0058] The first elastic member 35 is preferably a spring so as to be sleeved on the lower end of the guide shaft 36 .

[0059] In one embodiment, if Figure 1 As shown, a reverse flow port 15 is provided below the throttle port 12 in the valve body 1 , a valve plug 16 is provided below the reverse flow port 15 , and a second elastic member 17 for driving the valve plug 16 to seal the reverse flow port 15 is connected between the valve body 1 and the valve plug 16 .

[0060] In this embodiment, in a normal state, the valve plug 16 seals the reverse flow port 15 under the action of the second elastic member 17 .

[0061] If the air pressure on the side of the air outlet channel 13 increases due to a blockage of the air outlet channel 13 or other reasons, the air pressure acting on the top surface of the valve plug 16 increases, which will cause the valve plug 16 to leave the counterflow port 15, and the gas in the air outlet channel 13 will be discharged from the counterflow port 15. As needed, the gas discharged from the counterflow port 15 can be led out of the valve body 1, or the gas discharged from the counterflow port 15 can be introduced into the air inlet channel 11.

[0062] In one embodiment, if Figure 1-4 As shown, one end of the transparent cover 32 is sealed in the air cavity 30 , and the other end of the transparent cover 32 is outside the air cavity 30 , with a large size exposed outside, so that the user can observe the movement of the sliding sleeve 34 .

[0063] In one embodiment, if Figure 3-4 As shown, the valve body 1 is provided with an internal air passage 14 connecting the second communication port 302 and the air outlet channel 13. The internal air passage 14 extends in the valve body 1, and there is no need to provide a pipeline outside the valve body 1.

[0064] In one embodiment, if Figure 3-4 As shown, a first sealing ring 37 is provided on the circumferential surface of the piston 33 to improve the sealing performance of the piston 33 in the air chamber 30 .

[0065] In one embodiment, if Figure 1-4 As shown, the housing 31 includes a lower housing 311 connected to the valve body 1 and an upper housing 312 detachably connected to the lower housing 311 .

[0066] The transparent cover 32 has a cover flange 321 at the lower end thereof. The cover flange 321 is sandwiched between the lower shell 311 and the upper shell 312 .

[0067] In this embodiment, the housing 31 is divided into a lower housing 311 and an upper housing 312, each of which has a portion of the air cavity 30. The first communication port 301 is provided at the bottom of the lower housing 311, and the second communication port 302 is provided at the side of the lower housing 311.

[0068] The lower shell 311 is connected to the valve body 1 by fasteners, and the upper shell 312 is also connected to the upper shell 312 by fasteners. The lower end of the transparent cover 32 has a cover flange 321, and the cover flange 321 is bent and extended toward the outer periphery of the transparent cover 32. During assembly, the transparent cover 32 passes through the air cavity 30 of the upper shell 312 from bottom to top, and the cover flange 321 is clamped between the lower shell 311 and the upper shell 312 and sealed, so that the transparent cover 32 is fixed to the shell 31, which is convenient for assembly.

[0069] In one embodiment, if Figure 3-4 As shown, a second sealing ring 38 is provided between the lower shell 311 and the upper shell 312 to improve the sealing performance between the lower shell 311 and the upper shell 312 .

[0070] In one embodiment, if Figure 3-4 As shown, a third sealing ring 39 is provided between the cover flange 321 and the lower shell 311 and / or the upper shell 312 to improve the sealing performance between the cover flange 321 and the lower shell 311 and the upper shell 312.

[0071] In one embodiment, if Figure 1 As shown, the valve core 2 includes a handle 21 , a valve stem 22 , a valve block 23 and a threaded sleeve 24 .

[0072] The valve body 1 is provided with a valve tube 18 above the throttle port 12. The valve stem 22 is connected between the handle 21 and the valve block 23, the threaded sleeve 24 is connected to the valve tube 18, and the valve stem 22 passes through the threaded sleeve 24 and is threadedly connected to the threaded sleeve 24. The valve block 23 can slide up and down in the valve tube 18 and seal with the inner surface of the valve tube 18. The bottom surface of the valve block 23 is provided with a conical tip 231 that can pass through the throttle port 12. Since the conical tip 231 is thick at the top and thin at the bottom, the opening of the throttle port 12 can be adjusted by adjusting the position or depth of the conical tip 231 inserted into the throttle port 12, that is, adjusting the size of the gap between the wall surface of the throttle port 12 and the conical tip 231.

[0073] The user can rotate the handle 21 forward to drive the valve stem 22 to rotate, and the valve stem 22 drives the valve block 23 to move downward, so that the conical tip 231 moves downward in the throttle port 12, thereby reducing the opening of the throttle port 12.

[0074] Rotating the handle 21 in the opposite direction can drive the conical tip 231 upward, thereby increasing the opening of the throttle port 12 .

[0075] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0076] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A throttle valve, characterized in that: Including valve body, valve core and indicator; The valve body comprises an air inlet passage, a throttle port and an air outlet passage which are connected in sequence; The valve core is connected to the valve body and can adjust the opening of the throttle port; The indicator comprises a housing having an air cavity, a transparent cover connected to the housing and communicating with the air cavity, a piston slidably mounted in the air cavity, and a sliding sleeve connected to the piston; The bottom of the air cavity is provided with a first communication port communicating with the air inlet channel, and the wall of the air cavity is provided with a second communication port communicating with the air outlet channel; The piston is located between the first communication port and the second communication port, one end of the sliding sleeve is slidably assembled in the transparent cover, and a first elastic member for driving the piston to move downward is provided in the air cavity.

2. The throttle valve according to claim 1, characterized in that: A guide shaft is arranged in the transparent cover, and the sliding sleeve is sleeved with the guide shaft.

3. The throttle valve according to claim 2, characterized in that: The first elastic member is connected between the guide shaft and the piston.

4. The throttle valve according to claim 1, characterized in that: A backflow port is provided in the valve body below the throttling port, a valve plug is provided below the backflow port, and a second elastic member for driving the valve plug to seal the backflow port is connected between the valve body and the valve plug.

5. The throttle valve according to any one of claims 1 to 4, characterized in that: One end of the transparent cover is sealed and connected in the air cavity, and the other end of the transparent cover is located outside the air cavity.

6. The throttle valve according to any one of claims 1 to 4, characterized in that: The valve body is provided with an internal air passage communicating with the second communication port and the air outlet passage.

7. The throttle valve according to any one of claims 1 to 4, characterized in that: A first sealing ring is arranged on the circumferential surface of the piston.

8. The throttle valve according to any one of claims 1 to 4, characterized in that: The housing comprises a lower housing connected to the valve body and an upper housing detachably connected to the lower housing; The lower end of the transparent cover is provided with a cover flange, and the cover flange is sandwiched between the lower shell and the upper shell.

9. The throttle valve according to claim 8, characterized in that A second sealing ring is provided between the lower shell and the upper shell.

10. The throttle valve according to claim 8, characterized in that A third sealing ring is provided between the cover flange and the lower shell and / or the upper shell.

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