The throttling structure of the direction-control oil of the hydraulic control directional valve of the hydraulic natural gas compressor

Abstract

A reversing control oil throttling structure of a hydraulic natural gas compressor hydraulic control reversing valve comprises a valve block, a first oil channel is arranged in the valve block, a third oil channel is arranged in the valve block, the third oil channel is connected with the first oil channel through a throttling hole in the valve block, an internal throttling device is installed in the valve block corresponding to the throttling hole, the internal throttling device comprises an adjusting valve core and a transition connecting sleeve, the transition connecting sleeve is threadedly connected with the mounting hole on the valve block, a flow cavity for connecting the third oil channel with the throttling hole is reserved in the mounting hole, the adjusting valve core is threadedly matched with the transition connecting sleeve, the front end head of the adjusting valve core is conical, and the front end head extends into the throttling hole, there is a flow gap between the front end head and the throttling hole, the flow gap is locked by a locking nut, a polygonal limiting boss is arranged at the outer end of the transition connecting sleeve, an anti-rotation limiting block is installed on the valve block near the transition connecting sleeve corresponding to the limiting boss, and at least two straight edges for limiting are arranged on the outer periphery of the anti-rotation limiting block to prevent the transition connecting sleeve from loosening.

Description

Technical Field

[0001] The invention relates to the field of hydraulic natural gas compressor equipment, and in particular to a reversing control oil throttling structure of a hydraulic natural gas compressor hydraulic control reversing valve. Background Art

[0002] The compression cylinder of the hydraulic natural gas compressor is the main working part of the compressor. Its working performance depends on the reversing action characteristics of the hydraulic control reversing valve. The reversing action characteristics of the hydraulic control reversing valve are directly related to the flow of the reversing control oil. Therefore, the reversing control oil with a stable flow is very important in the working process of the compressor. The reversing control oil is formed by the pressure oil being throttled by the throttling device on the valve block. The current throttling device is to connect an external oil pipe from the oil supply oil channel provided on the valve block, install a throttle valve on the external oil pipe, connect the downstream end of the throttle valve to the first interface of the tee through the oil pipe, connect the overflow valve installed on the valve block to the second interface of the tee through the external overflow pipe, and connect the third interface of the tee to the external output pipeline. When working, the control oil is throttled from the external oil pipe through the throttle valve and flows into the output pipeline through the tee. The oil in the overflow pipe of the overflow valve is merged into the output oil pipe through the tee, and the reversing control oil of the hydraulic control reversing valve is formed in the output oil pipe. Such a throttling device requires an external steel pipe, which not only increases the occupied space but also increases the cost. In addition, since the adjusting handle of the throttle valve installed on the external oil pipe cannot be locked, it is easy to be touched and turned, or the handle can be touched by mistake, thereby changing the throttling performance of the throttle valve, resulting in changes in the supply flow of the switching control oil of the hydraulically controlled reversing valve, changing the switching action characteristics of the hydraulically controlled reversing valve, and affecting the working performance of the compression cylinder. Summary of the invention

[0003] In order to solve the problems existing in the above prior art, the present invention provides a throttling structure of a reversing control oil of a hydraulic natural gas compressor hydraulic control reversing valve, which can output a stable flow of reversing control oil. The technical solution of the present invention is as follows:

[0004] A reversing control oil throttling structure of a hydraulic natural gas compressor hydraulic control reversing valve, comprising a valve block of a hydraulic control reversing valve, wherein a first oil passage for providing pressure oil is provided in the valve block, a third oil passage for outputting control oil is provided in the valve block, the third oil passage is connected to the first oil passage via a throttling hole provided in the valve block, an internal throttling device is installed in the valve block corresponding to the throttling hole, the internal throttling device comprises a regulating valve core and a transition connecting sleeve, the transition connecting sleeve is threadedly connected to the mounting hole on the valve block via an external thread and is sealed, the mounting hole has a flow cavity for connecting the third oil passage and the throttling hole, the regulating valve core is matched with the internal thread in the transition connecting sleeve via a thread and is sealed, the front end head of the regulating valve core is a conical structure, the small end of the front end head can extend into the throttling hole, and the large end of the front end head can extend into the throttling hole. The diameter is larger than the aperture of the throttling hole, and the flow clearance between the front end head and the throttling hole can be adjusted by twisting the adjusting valve core, and the flow clearance of the adjusting valve core is locked by a locking nut. A polygonal limiting boss is provided at one end of the transition connecting sleeve extending out of the valve block, and an anti-rotation limiting block corresponding to the limiting boss is fixedly installed on the valve block near the transition connecting sleeve by screws. At least two limiting straight edges are provided at different positions on the periphery of the anti-rotation limiting block, wherein the distance between the first limiting straight edge and the axis of the screw is greater than the distance between the second limiting straight edge and the axis of the screw. The limiting straight edges at different positions can be selected according to the rotation angle of the polygonal limiting boss after the transition connecting sleeve is installed and fixed, and a limiting straight edge of the anti-rotation limiting block is selected to press against the edge of the limiting boss to form an anti-rotation limit to prevent the transition connecting sleeve from rotating and loosening.

[0005] An overflow valve is installed on the valve block, and a second oil passage is arranged in the valve block. The upstream end of the second oil passage is communicated with the overflow valve, and the downstream end of the second oil passage is communicated with the third oil passage.

[0006] The downstream end of the second oil passage is communicated with the flow chamber in the valve block.

[0007] A third limiting straight edge is arranged on the periphery of the anti-rotation limiting block, and the distance between the third limiting straight edge and the axis of the screw is smaller than the distance between the second limiting straight edge and the axis of the screw.

[0008] The mounting hole on the valve block is a stepped hole, the center of the bottom of the stepped hole is a throttling hole, the small diameter section of the stepped hole is an internal thread section, and the large diameter section is a smooth section. The front section of the transition connecting sleeve is provided with an external thread that cooperates with the thread of the small diameter section of the mounting hole, and the rear section is provided with an annular groove, in which a first sealing ring is provided, and the first sealing ring contacts with the smooth section of the mounting hole to form a seal.

[0009] The axial center hole of the transition connecting sleeve is a stepped hole, the middle section of the stepped hole is a smooth small diameter section, and the two ends are large diameter sections. A second sealing ring is arranged in the large diameter section at the front end of the stepped hole, and an internal thread is arranged in the large diameter section at the rear end. The regulating valve core is a stepped shaft, and the small diameter section at the front section of the stepped shaft is a smooth section. The smooth section forms a seal with the transition connecting sleeve through the second sealing ring, and the large diameter section at the rear section cooperates with the internal thread of the transition connecting sleeve to adjust the flow clearance.

[0010] The end of the regulating valve core outside the valve block is provided with a structure for applying torque.

[0011] The downstream end of the third oil passage of the valve block is fixedly connected to a pipe joint for connecting to an output pipeline.

[0012] The above technical solution is adopted: a valve block including a hydraulically controlled reversing valve, wherein a first oil passage for providing pressure oil is provided in the valve block, a third oil passage for outputting control oil is provided in the valve block, the third oil passage is connected to the first oil passage via a throttling hole provided in the valve block, a built-in throttling device is installed in the valve block corresponding to the throttling hole, the built-in throttling device includes a regulating valve core and a transition connecting sleeve, the transition connecting sleeve is threadedly connected to the mounting hole on the valve block via an external thread and is sealed, the mounting hole has a flow chamber connecting the third oil passage and the throttling hole, the regulating valve core is matched with the internal thread in the transition connecting sleeve via a thread and is sealed, the front end head of the regulating valve core is a conical structure, the small end of the front end head can extend into the throttling hole, and the large end of the front end head has a diameter larger than the throttling hole. The valve block of the embodiment of the present invention has a plurality of limiting grooves, and the limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. The limiting grooves are connected to the valve block through the groove of the adjusting spool. In such a throttling structure, a built-in throttling device is installed on the valve block, thereby eliminating the trouble of external steel pipes, not only reducing the occupied space, but also reducing costs. In addition, the regulating valve core is locked by a locking nut, and the transition connecting sleeve is limited by an anti-rotation limit block, which prevents the transition connecting sleeve from loosening when adjusting the regulating valve core and loosening of the transition connecting sleeve during use. It also prevents people from accidentally touching the handle and changing the throttling effect. The throttling performance of this throttling structure is stable, and the output reversing control oil flow is stable, ensuring the reversing performance of the hydraulically controlled reversing valve and the smooth operation of the compression cylinder.

[0013] An overflow valve is installed on the valve block, and a second oil channel is set in the valve block. The upstream end of the second oil channel is connected with the overflow valve, and the downstream end of the second oil channel is connected with the third oil channel. The pressure oil in the second oil channel merges with the pressure oil flowing out of the throttling hole in the flow chamber, and then flows into the third oil channel.

[0014] A third limiting straight edge is arranged on the periphery of the anti-rotation limiting block, and the distance from the third limiting straight edge to the axis of the screw is smaller than the distance from the second limiting straight edge to the axis of the screw. When the transition connecting sleeve is installed in place and the corner of the polygonal limiting boss is located on the center line connecting the screw and the regulating valve core, the third limiting straight edge of the anti-rotation limiting block is used for limiting.

[0015] The mounting hole on the valve block is a stepped hole, the center of the bottom of the stepped hole is a throttling hole, the small diameter section of the stepped hole is an internal thread section, and the large diameter section is a smooth section. The front section of the transition connecting sleeve is provided with an external thread that cooperates with the thread of the small diameter section of the mounting hole, and the rear section is provided with an annular groove, in which a first sealing ring is provided. The first sealing ring contacts with the smooth section of the mounting hole to form a seal, so that the transition connecting sleeve is sealed and connected to the mounting hole on the valve block.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 CC view;

[0019] Figure 3 for Figure 1 The enlarged view of point B;

[0020] Figure 4 It is a structural schematic diagram of the built-in throttling device and the anti-rotation limit block;

[0021] Figure 5 It is a structural schematic diagram of the first oil passage, the throttling hole, the second oil passage, and the mounting hole in the valve block;

[0022] Figure 6 It is a structural schematic diagram of a transition connection sleeve;

[0023] Figure 7 It is a structural schematic diagram of the regulating valve core;

[0024] Figure 8 It is a structural schematic diagram of an anti-rotation limit block provided with two limit straight edges;

[0025] Fig. 9 It is a structural schematic diagram of an anti-rotation limit block with three limit straight edges. DETAILED DESCRIPTION

[0026] An embodiment of the directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve of the present invention:

[0027] See also Figure 1-Figure 4A throttling structure for a hydraulic control directional control valve of a natural gas compressor, comprising a valve block 1 of a hydraulic control directional control valve, wherein a first oil passage 2 for providing pressure oil is provided in the valve block 1, a third oil passage 11 for outputting control oil is provided in the valve block 1, the third oil passage 11 is connected to the first oil passage 2 through a throttling hole 13 provided in the valve block 1, a built-in throttling device 3 is installed in the valve block 1 corresponding to the throttling hole 13, the built-in throttling device 3 comprises a regulating valve core 4 and a transition connecting sleeve 5, the transition connecting sleeve 5 is connected to the valve core 4 through an external thread The mounting hole 18 on the block 1 is threaded and sealed. The mounting hole 18 on the valve block 1 is a stepped hole, the center of the bottom of the stepped hole is a throttling hole 13, the small diameter section of the stepped hole is an internal thread section, and the large diameter section is a smooth section. The front section of the transition connecting sleeve 5 is provided with an external thread that cooperates with the thread of the small diameter section of the mounting hole 18, and the rear section is provided with an annular groove 20, in which a first sealing ring 14 is provided. The first sealing ring 14 contacts with the smooth section of the mounting hole 18 to form a seal, so that the transition connecting sleeve 5 is sealed and connected with the mounting hole 18 on the valve block 1. The mounting hole 18 is provided with a flow chamber 12 which connects the third oil passage 11 and the throttle hole 13. The regulating valve core 4 is matched and sealed with the internal thread 21 in the transition sleeve 5 through a thread. The axial center hole of the transition sleeve 5 is a stepped hole. The middle section of the stepped hole is a smooth small diameter section 22, and the two ends are large diameter sections. A second sealing ring 15 is arranged in the large diameter section at the front end of the stepped hole, and an internal thread 21 is arranged in the large diameter section at the rear end. The regulating valve core 4 is a stepped shaft. The small diameter section of the front section of the stepped shaft is a smooth section 23. The smooth section 23 forms a seal with the transition sleeve 5 through the second sealing ring 15. The large diameter section of the rear section is threadedly matched with the internal thread 21 of the transition sleeve 5 to adjust the flow clearance. The front end head of the regulating valve core 4 is of a conical structure, the small end of the front end head can be inserted into the throttling hole 13, and the large end of the front end head has a diameter larger than the aperture of the throttling hole 13. The end of the regulating valve core 4 located outside the valve block 1 is provided with a structure 19 for applying torque. In this embodiment, the structure 19 for applying torque is hexagonal, and the flow clearance between the front end head and the throttling hole 13 can be adjusted by twisting the structure 19 for applying torque of the regulating valve core 4. The flow clearance of the regulating valve core 4 is locked by a locking nut 6. The end of the transition connecting sleeve 5 extending out of the valve block 1 is provided with a polygonal limiting boss 5-1. In this embodiment, the limiting boss 5-1 is hexagonal.A threaded hole is provided on the valve block 1 near the transition connecting sleeve 5, and a screw 7 is threadedly engaged in the threaded hole. An anti-rotation limit block 8 is fixedly installed by the screw 7 to correspond to the limit boss 5-1. A washer is also provided between the screw 7 and the anti-rotation limit block 8. The head of the screw 7 presses the washer onto the anti-rotation limit block 8. At least two limiting straight edges are provided at different positions on the periphery of the anti-rotation limit block 8, wherein the distance between the first limiting straight edge 8-1 and the axis of the screw 7 is greater than the distance between the second limiting straight edge 8-2 and the axis of the screw 7. The limiting straight edges at different positions can be adjusted according to the transition The rotation angle of the polygonal limiting boss 5-1 after the connecting sleeve 5 is installed and fixed, a limiting straight edge of the anti-rotation limiting block 8 is selected to press against the edge of the limiting boss 5-1 to form an anti-rotation limit to prevent the transition connecting sleeve 5 from rotating and loosening. When the edge of the limiting boss 5-1 is perpendicular to the center line of the screw 7 and the regulating valve core 4, the first limiting straight edge 8-1 is selected to press against the edge of the limiting boss 5-1 to form an anti-rotation limit. When the edge of the limiting boss 5-1 is oblique to the center line of the screw 7 and the regulating valve core 4, the second limiting straight edge 8-2 is selected to press against the edge of the limiting boss 5-1 to form an anti-rotation limit. The outer periphery of the anti-rotation limit block 8 can also be provided with a third limit straight edge 8-3, and the distance between the third limit straight edge 8-3 and the axis of the screw 7 is smaller than the distance between the second limit straight edge 8-2 and the axis of the screw 7. When the transition sleeve 5 is installed in place, and the corner of the polygonal limit boss 5-1 is located on the center line of the screw 7 and the regulating valve core 4, the third limit straight edge 8-3 of the anti-rotation limit block 8 is used to press against the edge of the limit boss 5-1 to form an anti-rotation limit. In this embodiment, the outer periphery of the anti-rotation limit block 8 is a circle with two or three cut planes, that is, two or three straight edges for limiting. An overflow valve 9 is installed on the valve block 1, and a second oil channel 10 is arranged in the valve block 1. The upstream end of the second oil channel 10 is connected to the overflow valve 9, and the downstream end of the second oil channel 10 is connected to the third oil channel 11. The pressure oil in the second oil channel 10 merges with the pressure oil flowing out of the throttling hole 13 in the flow chamber 12, and then flows into the third oil channel 11. A pipe joint 16 is fixedly connected to the downstream end of the third oil passage 11 of the valve block 1 for connecting to an output pipeline 17 .

[0028] In such a throttling structure, a built-in throttling device 3 is installed on the valve block 1, thereby eliminating the trouble of external steel pipes, not only reducing the occupied space, but also reducing the cost. In addition, the regulating valve core 4 is locked by the locking nut 6, and the transition connecting sleeve 5 is limited by the anti-rotation limit block 8, which prevents the transition connecting sleeve 5 from loosening when adjusting the regulating valve core 4 and the transition connecting sleeve 5 from loosening during use. It also prevents the problem of people accidentally touching the handle and changing the throttling effect, so that the throttling performance of this throttling structure is stable, the output reversing control oil flow is stable, and the reversing performance of the hydraulically controlled reversing valve and the smooth operation of the compression cylinder are guaranteed.

[0029] In this embodiment, after the transition sleeve 5 is installed on the valve block 1, according to the different positions of the outer hexagon of the limiting boss 5-1, a straight edge of the anti-rotation limiting block 8 is selected to limit the limiting boss 5-1, and the structure 19 that applies torque to the regulating valve core 4 is twisted to adjust the flow clearance between the front end of the regulating valve core 4 and the throttle hole 13 to an appropriate size. When the embodiment is working, the pressure oil in the first oil channel 2 flows into the throttle hole 13, and then passes through the flow clearance between the front end of the regulating valve core 4 and the throttle hole 13 to complete the throttling. At the same time, the oil in the relief valve 9 flows from the second oil channel 10 into the flow chamber 12, merges with the pressure oil flowing out of the throttle hole 13, and then flows into the third oil channel 11, and finally forms the reversing control oil and is transported to the hydraulic control reversing valve through the output pipeline 17.

Claims

1. A directional control oil throttling structure of a hydraulic natural gas compressor hydraulic control directional valve, comprising a valve block (1) of the hydraulic control directional valve, wherein a first oil passage (2) for supplying pressure oil is provided in the valve block (1), and characterized in that: A third oil passage (11) for outputting control oil is provided in the valve block (1). The third oil passage (11) is connected to the first oil passage (2) via a throttling hole (13) provided in the valve block (1). A built-in throttling device (3) is installed in the valve block (1) corresponding to the throttling hole (13). The built-in throttling device (3) comprises a regulating valve core (4) and a transition sleeve (5). The transition sleeve (5) is threadedly connected to a mounting hole (18) on the valve block (1) via an external thread and is sealed. The mounting hole (18) has a flow chamber (12) for connecting the third oil passage (11) and the throttling hole (13). The regulating valve core (4) is threadedly matched with an internal thread in the transition sleeve (5) and is sealed. The front end of the regulating valve core (4) is in a conical structure. The small end of the front end can extend into the throttling hole (13). The large end of the front end has a diameter larger than the diameter of the throttling hole (13). The front end can be adjusted by turning the regulating valve core (4). The regulating valve core (4) is locked by a locking nut (6), and one end of the transition sleeve (5) extending out of the valve block (1) is provided with a polygonal limiting boss (5-1). An anti-rotation limiting block (8) is fixedly mounted on the valve block (1) at a position close to the transition sleeve (5) by screws (7) and corresponds to the limiting boss (5-1). Different positions on the outer circumference of the anti-rotation limiting block (8) are provided with At least two limiting straight edges are provided, wherein the distance between the first limiting straight edge (8-1) and the axis of the screw (7) is greater than the distance between the second limiting straight edge (8-2) and the axis of the screw (7). The limiting straight edges at different positions can be selected according to the rotation angle of the polygonal limiting boss (5-1) after the transition sleeve (5) is installed and fixed, so that one limiting straight edge of the anti-rotation limiting block (8) is pressed against the edge of the limiting boss (5-1) to form an anti-rotation limit, thereby preventing the transition sleeve (5) from rotating and loosening.

2. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized in that: A relief valve (9) is installed on the valve block (1), and a second oil passage (10) is arranged in the valve block (1), the upstream end of the second oil passage (10) is connected to the relief valve (9), and the downstream end of the second oil passage (10) is connected to the third oil passage (11).

3. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 2 is characterized by: The downstream end of the second oil passage (10) is in communication with the flow chamber (12) in the valve block (1).

4. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized by: A third limiting straight edge (8-3) is provided on the periphery of the anti-rotation limiting block (8), and the distance from the third limiting straight edge (8-3) to the axis of the screw (7) is smaller than the distance from the second limiting straight edge (8-2) to the axis of the screw (7).

5. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized in that: The mounting hole (18) on the valve block (1) is a stepped hole, the center of the bottom of the stepped hole is a throttling hole (13), the small diameter section of the stepped hole is an internal thread section, and the large diameter section is a smooth section, the front section of the transition connecting sleeve (5) is provided with an external thread that matches the thread of the small diameter section of the mounting hole (18), and the rear section is provided with an annular groove (20), a first sealing ring (14) is provided in the annular groove (20), and the first sealing ring (14) contacts the smooth section of the mounting hole (18) to form a seal.

6. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized by: The axial center hole of the transition connection sleeve (5) is a stepped hole, the middle section of the stepped hole is a smooth small diameter section, and the two ends are large diameter sections. A second sealing ring (15) is arranged in the large diameter section at the front end of the stepped hole, and an internal thread is arranged in the large diameter section at the rear end. The regulating valve core (4) is a stepped shaft, the small diameter section at the front end of the stepped shaft is a smooth section, and the smooth section forms a seal with the transition connection sleeve (5) through the second sealing ring (15), and the large diameter section at the rear end cooperates with the internal thread of the transition connection sleeve (5) to adjust the flow clearance.

7. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized by: The end of the regulating valve core (4) located outside the valve block (1) is provided with a structure (19) for applying torque.

8. The directional control oil throttling structure of the hydraulic natural gas compressor hydraulic control directional valve according to claim 1 is characterized by: A pipe joint (16) is fixedly connected to the downstream end of the third oil passage (11) of the valve block (1) for connecting to an output pipeline (17).

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