Automatic control device for valves on compressor unit

Abstract

The utility model discloses an automatic control device for a valve on a compressor unit, which comprises a valve body, a speed reducer is fixed on the valve body of the valve body, the output end of the speed reducer is fixedly connected with a valve rod of the valve body, the input end of the speed reducer is fixedly connected with the lower end of a square rod, and the outer side of the square rod is elastically and slidably sleeved with a square sleeve. The square sleeve rotates along with the square rod, the square sleeve is slidably sleeved with a gear ring, the gear ring rotates along with the square sleeve, an annular groove is formed in the square sleeve above the gear ring, the gear ring is rotationally connected with a shell of a speed reducer, a pneumatic motor is fixed to the shell of the speed reducer, a gear is fixed to the output end of the pneumatic motor and meshed with the gear ring, and a screw is concentrically fixed to the upper end of the square rod. The upper end of the screw extends to the outer side of the square sleeve, and the screw is in threaded connection with a nut. The valve body can be directly and manually opened and closed through the hand wheel, and the problem that manual operation is inconvenient when an automatic control function fails is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic control, and in particular relates to an automatic control device for a valve. Background Art

[0002] Natural gas is compressed by the compressor unit and stored in the gas storage device. When in use, high-pressure natural gas enters the high-pressure filter, and the filtered clean high-pressure natural gas enters the heat exchanger and is heated to 75-80°C. After decompression, the heated natural gas is reduced to a suitable pressure. The decompressed natural gas is filtered, measured by a flow meter, and then supplied to the gas-using equipment.

[0003] At present, the service life of many compressor units in operation is more than 10 years. The inflow and outflow control of natural gas on the units is still achieved by manually opening and closing valves, which cannot meet the current market's requirements for rapid response of units. Moreover, facing large-pound and large-caliber valves, the danger of manual operation is obviously higher than the mainstream automatic control on the market. However, it is difficult to expand the capacity of existing plants (such as adding new power or gas sources), and the automation control transformation is difficult.

[0004] In response to the above problems, a Chinese utility model patent with authorization announcement number CN210128245U discloses a process system that uses natural gas as a power source for an actuator, including a pressure reducing mechanism and a gas collecting mechanism. The pressure reducing mechanism includes a pressure reducing pipeline, a high-pressure filter, an emergency shut-off valve, a heat exchanger and a first pressure regulator. The gas collecting mechanism includes a gas collecting bag and a second pressure regulator. A gas collecting pipeline is connected between the gas collecting bag and the pressure reducing pipeline. The gas collecting bag is externally connected to a gas supply pipeline. The gas collecting bag is respectively connected to the emergency shut-off valve and the first pressure regulator through the gas supply pipeline. This arrangement allows the compressed natural gas in the pressure reducing pipeline to serve as a control gas source and enter the control system of the emergency shut-off valve and the first pressure regulator through the second pressure regulator, the second valve and the gas collecting bag, thereby realizing the respective functions of the emergency shut-off valve and the first pressure regulator, enabling them to work normally, and utilizing the high-pressure natural gas itself as the control gas source for the emergency shut-off valve and the first pressure regulator, so that the cost is effectively controlled. Although this method uses natural gas as the power source to achieve automatic control of valves, when the natural gas supply is insufficient or the actuator (such as a pneumatic motor) fails, the valve still needs to be opened and closed manually. The existing solution does not fully consider the situation of manual operation of the valve after the modification, which makes it inconvenient to open and close the valve manually. Utility Model Content

[0005] The utility model provides an automatic control device for valves on a compressor unit, which aims to solve the problem of inconvenience in manually operating the valves when a fault occurs.

[0006] The technical solution provided by the utility model is:

[0007] An automatic control device for a valve on a compressor unit comprises a valve body, a reducer is fixed on the valve body of the valve body, the output end of the reducer is fixedly connected to the valve stem of the valve body, the input end of the reducer is fixedly connected to the lower end of a square rod, the input end of the reducer is concentric with the square rod, a square sleeve is elastically and slidingly sleeved on the outer side of the square rod, the square sleeve rotates with the square rod, a hand wheel is fixed on the square sleeve, a sliding sleeve on the square sleeve is provided with a gear ring, the gear ring rotates with the square sleeve, a ring groove is provided on the square sleeve above the gear ring, the groove width of the ring groove is greater than the thickness of the gear ring, the gear ring is rotatably connected to a housing of the reducer, an air motor is fixed on the housing of the reducer, a gear is fixed on the output end of the air motor, the gear is meshed with the gear ring, a screw is concentrically fixed on the upper end of the square rod, the upper end of the screw extends to the outer side of the square sleeve, a nut is threadedly connected to the screw; a spring is sleeved on the square rod below the square sleeve, the spring is used to push the square sleeve upward.

[0008] Specifically, a filter pressure reducing valve and an electromagnetic reversing valve are installed on the air inlet end of the pneumatic motor. The filter pressure reducing valve is connected to a gas storage device storing compressed natural gas. The air outlet end of the pneumatic motor is connected to a natural gas low-pressure pipeline on the front side of the compressor unit through a pipeline.

[0009] Specifically, a fixed cylinder is fixed on the reducer housing, the fixed cylinder is concentric with the output shaft and the square rod of the reducer, and the gear ring is rotatably connected to the upper end of the fixed cylinder.

[0010] Specifically, a retaining ring is fixed to the upper end of the screw rod.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. When manual operation is required, the valve stem can be driven to rotate by rotating the handwheel. If the pneumatic motor is damaged, the square sleeve can be pressed by the handwheel, and the square sleeve compresses the spring and moves downward. When the gear ring corresponds to the ring groove, the gear ring separates from the square sleeve, and then the nut is turned to limit the square sleeve. After that, the valve body can be manually opened and closed by the handwheel. If the pneumatic motor is normal but the natural gas supply part fails, the handwheel can be directly turned to operate.

[0013] 2. When the valve body is opened and closed manually, the gear ring is separated from the square sleeve, which can prevent the valve body from being unable to be opened and closed manually when the pneumatic motor is stuck.

[0014] 3. A filter pressure reducing valve is installed on the air inlet end of the pneumatic motor. The filter pressure reducing valve can filter and reduce the pressure of high-pressure natural gas, which can effectively protect the pneumatic motor and increase the service life of the pneumatic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the utility model.

[0016] Figure 2It is a cross-sectional view of the fixed cylinder.

[0017] Figure 3 It is a top view of the utility model.

[0018] Figure 4 for Figure 3 AA section view.

[0019] Reference numerals include:

[0020] 1. Valve body, 2. Reducer, 3. Square rod, 4. Spring, 5. Fixed cylinder, 6. Gear ring, 7. Square sleeve, 8. Handwheel, 9. Ring groove, 10. Nut, 11. Screw, 12. Retaining ring, 13. Pneumatic motor, 14. Gear. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example 1: Reference Figure 1-Figure 4 As shown, an automatic control device for a valve on a compressor unit includes a valve body 1, a reducer 2 is fixed on the valve body of the valve body 1, the output end of the reducer 2 is fixedly connected to the valve stem of the valve body 1, the input end of the reducer 2 is fixedly connected to the lower end of the square rod 3, the input end of the reducer 2 is concentric with the square rod 3, a square sleeve 7 is elastically slidably sleeved on the outer side of the square rod 3, a hand wheel 8 is fixed on the square sleeve 7, and the square sleeve 7 rotates with the square rod 3. Specifically, a spring 4 is sleeved on the square rod 3 below the square sleeve 7, the lower end of the spring 4 is tightly against the output shaft of the reducer 2, and the upper end of the spring 4 is tightly against the square sleeve 7.

[0023] A gear ring 6 is provided on the sliding sleeve of the square sleeve 7, and the gear ring 6 rotates with the square sleeve 7. The gear ring 6 and the square sleeve 7 can be connected by a spline mechanism. An annular groove 9 is provided on the square sleeve 7 above the gear ring 6, and the groove width of the annular groove 9 is greater than the thickness of the gear ring 6. The gear ring 6 is rotatably connected to the housing of the reducer 2. Specifically, a fixed cylinder 5 is fixed on the housing of the reducer 2, and the fixed cylinder 5 is concentric with the output shaft of the reducer 2 and the square rod 3, and the gear ring 6 is rotatably connected to the upper end of the fixed cylinder 5.

[0024] The housing of the reducer 2 is fixed with an air motor 13, and the output end of the air motor 13 is fixed with a gear 14, which meshes with the gear ring 6. A screw rod 11 is coaxially fixed to the upper end of the square rod 3, and the upper end of the screw rod 11 extends to the outside of the square sleeve 7. A nut 10 is threadedly connected to the screw rod 11, and the nut 10 is tightly against the upper end of the square sleeve 7.

[0025] The air inlet of the pneumatic motor 13 is provided with a filter pressure reducing valve and an electromagnetic reversing valve, and the filter pressure reducing valve is connected to a gas storage device storing compressed natural gas. The air outlet of the pneumatic motor 13 is connected to a natural gas low-pressure pipeline at the front side of the compressor unit through a pipeline.

[0026] When the valve body 1 needs to be opened, the electromagnetic reversing valve is started, and the electromagnetic reversing valve connects the first air inlet channel at the air inlet end of the pneumatic motor 13 with the filter pressure reducing valve and the gas storage device. The high-pressure natural gas in the gas storage device is filtered and reduced in pressure by the filter pressure reducing valve, and then flows through the electromagnetic reversing valve and the first air inlet channel at the air inlet end of the pneumatic motor 13 through the pneumatic motor 13, and the pneumatic motor 13 drives the gear 14 to rotate in the opposite direction. The gear 14 causes the square sleeve 7, the hand wheel 8 and the square rod 3 to rotate in the forward direction through the gear ring 6. When the square rod 3 rotates in the forward direction, the valve stem and the valve plate rotate in the forward direction through the reducer 2, and the valve body 1 opens. The natural gas discharged from the pneumatic motor 13 enters the natural gas low-pressure pipeline on the front side of the compressor unit through the pipeline.

[0027] When the valve body 1 needs to be closed, the electromagnetic reversing valve is started, and the electromagnetic reversing valve connects the second air inlet channel at the air inlet end of the pneumatic motor 13 with the filter pressure reducing valve and the gas storage device. The high-pressure natural gas in the gas storage device is filtered and reduced in pressure by the filter pressure reducing valve, and then flows through the electromagnetic reversing valve and the second air inlet channel at the air inlet end of the pneumatic motor 13 through the pneumatic motor 13, and the pneumatic motor 13 drives the gear 14 to rotate forward. The gear 14 causes the square sleeve 7, the hand wheel 8 and the square rod 3 to rotate in the opposite direction through the gear ring 6. When the square rod 3 rotates in the opposite direction, the valve stem and the valve plate rotate in the opposite direction through the reducer 2, and the valve body 1 is closed. The natural gas discharged from the pneumatic motor 13 enters the natural gas low-pressure pipeline on the front side of the compressor unit through the pipeline.

[0028] When the pneumatic motor 13 is damaged and the valve body 1 needs to be opened and closed manually, the square sleeve 7 is pressed by the hand wheel 8, so that the square sleeve 7 moves downward along the axial direction of the square rod 3 and compresses the spring 4. When the ring groove 9 corresponds to the gear ring 6, the gear ring 6 separates from the square sleeve 7. Then the nut 10 is turned to make the nut 10 rotate downward, and the square sleeve 7 is limited by the nut 10. Then the square sleeve 7 and the square rod 3 can be rotated by the hand wheel 8. At this time, the gear ring 6 does not rotate, which can avoid the situation where the square sleeve 7 and the square rod 3 cannot rotate due to the locking of the pneumatic motor 13.

[0029] When the pneumatic motor 13 is repaired, loosen the nut 10, and under the elastic force of the spring 4, the lower sleeve 7 and the handwheel 8 move upward along the axial direction of the square rod 3. When the gear ring 6 and the ring groove 9 are misaligned, the square sleeve 7 can rotate with the gear ring 6, and the pneumatic motor 13 can continue to open and close the valve body 1.

[0030] If the natural gas supply fails, the pneumatic motor 13 can rotate freely, and the hand wheel 8 can be directly rotated to realize manual control of the valve.

[0031] Embodiment 2: Based on Embodiment 1, refer to Figure 1 As shown, a retaining ring 12 is fixed to the upper end of the screw rod 11 .

[0032] By providing the retaining ring 12 , the retaining ring 12 can prevent the nut 10 from being separated from the screw rod 11 when the nut 10 is rotated.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic control device for a valve on a compressor unit, comprising a valve body (1), a reducer (2) being fixed on the valve body of the valve body (1), an output end of the reducer (2) being fixedly connected to a valve stem of the valve body (1), characterized in that: The input end of the reducer (2) is fixedly connected to the lower end of the square rod (3), the input end of the reducer (2) is concentric with the square rod (3), the outer side of the square rod (3) is elastically slidably sleeved with a square sleeve (7), the square sleeve (7) rotates with the square rod (3), a hand wheel (8) is fixed on the square sleeve (7), a gear ring (6) is slidably sleeved on the square sleeve (7), the gear ring (6) rotates with the square sleeve (7), an annular groove (9) is provided on the square sleeve (7) above the gear ring (6), the groove width of the annular groove (9) is greater than the thickness of the gear ring (6), and the gear ring (6) The square rod (3) is rotatably connected to the housing of the reducer (2); a pneumatic motor (13) is fixed to the housing of the reducer (2); a gear (14) is fixed to the output end of the pneumatic motor (13); the gear (14) is meshed with the gear ring (6); a screw rod (11) is coaxially fixed to the upper end of the square rod (3); the upper end of the screw rod (11) extends to the outside of the square sleeve (7); a nut (10) is threadedly connected to the screw rod (11); a spring (4) is sleeved on the square rod (3) below the square sleeve (7); the spring (4) is used to push the square sleeve (7) upward.

2. The automatic control device for valves on a compressor unit according to claim 1, characterized in that: A filter pressure reducing valve and an electromagnetic reversing valve are installed on the air inlet end of the pneumatic motor (13); the filter pressure reducing valve is connected to a gas storage device storing compressed natural gas; and the air outlet end of the pneumatic motor (13) is connected to a natural gas low-pressure pipeline on the front side of the compressor unit through a pipeline.

3. The automatic control device for valves on a compressor unit according to claim 1, characterized in that: A fixed cylinder (5) is fixed on the housing of the reducer (2); the fixed cylinder (5) is concentric with the output shaft of the reducer (2) and the square rod (3); and the gear ring (6) is rotatably connected to the upper end of the fixed cylinder (5).

4. The automatic control device for valves on a compressor unit according to claim 1, characterized in that: A retaining ring (12) is fixed to the upper end of the screw rod (11).

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