A control valve with a function of reducing water hammer

Abstract

The present invention discloses a control valve with a function of reducing water hammer, which relates to the technical field of control valves. It includes a valve body, an adjusting frame, a handwheel, a force transmission pipe, a buffer assembly, a valve core assembly, a valve stem and a force transmission assembly. In the present invention, the kinetic energy generated by the fluid impact force is converted into the mechanical transmission energy of the deflection of the first transmission ring and the second transmission ring through a compressed medium, and finally the purpose of the buffer piece being unfolded without external force drive is achieved. By using the synchronous unfolding of the first buffer piece and the second buffer piece, a double buffer barrier is formed to effectively disperse the water hammer impact energy. It not only gradually buffers the forward impact fluid, but also absorbs the secondary energy of the reverse flow fluid, so as to achieve the purpose of reducing water hammer at the secondary level. Through the design of a variable volume compression chamber, the compression chamber can automatically adaptively change according to the magnitude of the water hammer impact force, thereby driving the first buffer piece and the second buffer piece to adaptively unfold corresponding angles according to the magnitude of the water hammer impact force.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and specifically to a control valve with a function of reducing water hammer. Background Technique

[0002] Control valves play a key role in various pipeline systems. They can not only achieve precise regulation of fluids but also quickly cut off the flow of the medium when needed to ensure the safety and stability of the system. Control valves adjust the flow rate and flow volume of fluids by changing the opening degree of the valve, enabling the system to operate under the best working conditions according to the design requirements. Control valves not only play a role in regulation and protection during daily operation but are also important devices for ensuring system safety in emergency situations.

[0003] However, during the use of control valves, there are still many problems to be overcome. When water flow or other fluids flow at high speed in a pipeline, they have a certain inertia. If the valve is suddenly closed, the fluid cannot stop immediately due to inertia, resulting in a sharp drop in the flow rate and thus generating an instantaneous high-pressure shock wave. The instantaneous high-pressure shock wave generated by the water hammer effect causes the control valve to bear a pressure exceeding the designed load-bearing range, leading to mechanical fatigue, deformation, or even rupture of the valve body and internal components. At the same time, it accelerates the wear of the seals and sealing surfaces, and the resulting vibration also affects the operating mechanism and installation components, thereby reducing the isolation function of the valve and increasing system leakage and safety hazards. Summary of the Invention

[0004] The purpose of the present invention is to provide a control valve with a function of reducing water hammer to solve the problems raised in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A control valve with a function of reducing water hammer includes a valve body and a force transmission pipe. A valve stem is slidably installed on the valve body, a valve core assembly is installed on the valve stem, an adjustment bracket is installed on the valve body, a handwheel is rotatably installed on the adjustment bracket, the handwheel is threadedly connected to the valve stem, a buffer assembly is installed on the water inlet side of the valve body, a force transmission assembly is installed on the buffer assembly, one end of the force transmission pipe is communicated with the valve stem, and the other end of the force transmission pipe is communicated with the buffer assembly.

[0006] The valve stem is slidably connected to the valve body and can only slide up and down on the valve body. Since the handwheel is threadedly connected to the valve stem, when the handwheel rotates, the valve stem slides up and down by adjusting the thread.

[0007] When the control valve is in the open state, the fluid enters the valve body from the pipeline through the buffer assembly, passes through the gap between the valve core assembly and the valve body, and then flows out from the water outlet of the valve body. When flow regulation is required, by rotating the handwheel, the valve stem is driven to slide up and down. The valve stem drives the valve core assembly to move, changing the gap between the main valve core and the valve body. When the gap becomes larger, the flow volume increases; when the gap becomes smaller, the flow volume decreases, thereby achieving the purpose of flow regulation.

[0008] Furthermore, the valve core assembly includes a main valve core which is installed on the valve stem. A secondary valve core is slidably installed inside the main valve core. A buffer spring is installed between the secondary valve core and the main valve core. The secondary valve core is communicated with the valve stem. A compression chamber is provided inside the secondary valve core, and a compression medium is filled in the compression chamber. An opening and closing assembly is installed inside the main valve core, and an expansion airbag is installed on the main valve core.

[0009] When the control valve is suddenly shut down, the bottom of the valve core assembly is impacted by water hammer. After being impacted, the secondary valve core overcomes the elastic force of the buffer spring and moves upward in the buffer chamber.

[0010] When the impact force is small, the secondary valve core moves slightly, and part of the impact force is absorbed through the deformation of the buffer spring, thereby reducing the water hammer impact force and achieving the purpose of primary water hammer reduction.

[0011] Furthermore, a buffer chamber is provided on the main valve core, and a diversion channel is provided on the main valve core. One end of the diversion channel is communicated with the buffer chamber, and the other end of the diversion channel is communicated with the expansion airbag. The opening and closing assembly is located at the entrance of the diversion channel. The secondary valve core is located in the buffer chamber. A sliding groove is provided inside the main valve core, and the secondary valve core is slidably connected to the main valve core through the sliding groove.

[0012] Furthermore, a damping groove is also provided inside the main valve core. Annular corrugations are provided on the wall of the damping groove. A wing ring is provided on the secondary valve core. The bottom end of the buffer spring is connected to the wing ring, and the top end of the buffer spring is connected to the top end of the damping groove.

[0013] The annular corrugations in the damping groove are used to apply damping to the compressed buffer spring and delay the rebound time of the buffer spring.

[0014] Furthermore, the opening and closing assembly includes a baffle which is located at the entrance of the diversion channel. Wing plates are provided on the baffle, and a return spring is installed between the wing plates and the main valve core.

[0015] Under normal conditions, the baffle blocks the entrance of the diversion channel.

[0016] When the fluid impact force is too large, the secondary valve core moves upward to the top of the buffer chamber under the action of the impact force. The wing ring on the secondary valve core squeezes the buffer spring, and the buffer spring completely contracts into the damping groove. At the same time, when the wing ring moves to the height of the opening and closing assembly, it pushes the wing plate to move upward synchronously. The wing plate drives the baffle to lift upward, the entrance of the diversion channel is opened, the return spring is compressed, and the fluid rushes into the expansion airbag through the diversion channel. After the water flow is diverted, the impact on the valve core assembly is reduced, achieving the purpose of tertiary water hammer reduction.

[0017] After the expansion airbag is filled with fluid, it expands rapidly. When the water hammer dissipates, due to the damping of the buffer spring in the damping groove by the annular corrugation, it cannot rebound immediately. The secondary spool still remains at the top of the buffer chamber, and the diversion channel remains open. At this time, the expansion airbag retracts rapidly, and the fluid is extruded and flows back into the valve body through the diversion channel. Then the buffer spring gradually rebounds, and the secondary spool is reset under the push of the buffer spring. The rebound of the return spring drives the baffle to block the inlet of the diversion channel again.

[0018] Furthermore, an overflow channel is provided inside the valve stem. One end of the overflow channel is communicated with the compression chamber, and the other end of the overflow channel is communicated with the force transmission assembly through a transmission pipe. The valve stem is provided with an adjustment thread, and the valve stem is threadedly connected to the handwheel through the adjustment thread.

[0019] Furthermore, the force transmission assembly includes a force transmission housing. The force transmission housing is installed on the buffer assembly. The force transmission housing is provided with a liquid inlet, and the liquid inlet is communicated with the overflow channel through a transmission pipe. A piston head is slidably installed inside the force transmission housing. A force transmission bent rod is installed on the piston head. One end of the force transmission bent rod is installed with a connecting piece, and the connecting piece is connected to the buffer assembly.

[0020] When the impact is large, the secondary spool generates a large upward displacement. The volume of the compression chamber inside the secondary spool decreases. After the compression medium is squeezed, it sequentially enters the inside of the force transmission housing through the overflow pipe, the transmission pipe, and the liquid inlet. The compression medium pushes the piston head to make a curved displacement around the first transmission ring inside the force transmission housing. The piston head drives the force transmission bent rod to extend out of the force transmission housing. The force transmission bent rod drives the first transmission ring to deflect on the first buffer housing through the connecting piece. The first transmission ring drives the first buffer piece engaged with it to unfold. The first transmission ring drives the second transmission ring to deflect through the transmission rod. The second transmission ring drives the second buffer piece to unfold. The unfolded second buffer piece and the first buffer piece perform step-by-step buffering on the subsequent fluid flowing to the control valve. At the same time, the second buffer piece and the first buffer piece perform secondary buffering on the fluid flowing back after impacting the spool, so as to achieve the purpose of second-level reduction of water hammer.

[0021] The greater the impact on the secondary spool, the greater the upward displacement generated, and correspondingly, the greater the extrusion force of the compression medium on the piston head. The greater the deflection angles of the first transmission ring and the second transmission ring driven by the force transmission bent rod, and the higher the unfolding degree of the second buffer piece and the first buffer piece, making the resistance of the second buffer piece and the first buffer piece to the fluid greater, so as to achieve the purpose of automatically adjusting the second-level reduction intensity according to the strength of the water hammer.

[0022] Furthermore, the buffer assembly includes a buffer pipe. The buffer pipe is installed on the water inlet side of the valve body. The buffer pipe is provided with a first buffer and a second buffer. A transmission rod is installed between the first buffer and the second buffer. The force transmission housing is installed on the first buffer, and the connecting piece is connected to the first buffer.

[0023] Furthermore, the first buffer includes a first buffer shell, the first buffer shell is installed on the buffer tube, a force transmission shell is installed on the first buffer shell, a plurality of first buffer plates are rotatably installed in the first buffer shell, a first transmission ring is rotatably installed on the force transmission shell, the first buffer plate is meshed with the first transmission ring for transmission, the connecting piece is connected to the first transmission ring, and the force transmission rod is connected to the first transmission ring; transmission teeth are provided on the first buffer plate, a plurality of ring teeth are provided in the first transmission ring, and the transmission teeth are meshed with the ring teeth for transmission.

[0024] Furthermore, the second buffer includes a second buffer shell, a plurality of second buffer plates and a second transmission ring. The surface area of ​​the second buffer plate is smaller than that of the first buffer plate. The second transmission ring is connected to the force transmission rod. The second buffer shell is installed on the buffer tube. The second buffer plate is rotatably installed in the second buffer shell. The second transmission ring is rotatably installed on the second buffer shell. The second transmission ring is engaged with the second buffer plate for transmission.

[0025] The first buffer has the same internal structure as the second buffer, and only the surface area of ​​the first buffer sheet and the second buffer sheet is different. When the fluid flows through the unfolded first buffer sheet and the second buffer sheet, the flow rate is reduced after being blocked by the first buffer sheet and the second buffer sheet. The larger the blocking area of ​​the buffer sheet, the greater the blocking of the fluid. The resistance of the second buffer sheet to the fluid is smaller than that of the first buffer sheet. The first buffer sheet and the second buffer sheet block the fluid step by step. After the fluid flow rate and flow rate are reduced, the impact force on the auxiliary valve core is reduced.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The kinetic energy generated by the fluid impact force is converted into mechanical transmission energy of the first transmission ring and the second transmission ring through the compression medium, and finally the purpose of driving the buffer plate to expand without external force is achieved. The synchronous expansion of the first buffer plate and the second buffer plate forms a double buffer barrier to effectively disperse the water hammer impact energy. It not only implements step-by-step buffering for the forward impact fluid, but also absorbs the secondary energy of the reverse flow fluid, thereby achieving the purpose of secondary reduction of water hammer.

[0028] 2. Through the design of variable volume compression chamber, the compression chamber can automatically produce adaptive changes according to the size of water hammer impact force, thereby driving the first buffer plate and the second buffer plate to adaptively expand to corresponding angles according to the size of water hammer impact force, without manual intervention and adjustment, so as to achieve the purpose of automatically adjusting the secondary reduction intensity according to the strength of water hammer.

[0029] 3. The displacement of the auxiliary valve core links the opening of the diversion channel to achieve rapid diversion of the impact fluid; the expansion of the inflatable airbag is used to divert the excess fluid, and the fluid is buffered by its own deformation to achieve the purpose of three-level reduction of water hammer. The wing ring, wing plate and baffle are linked to trigger the opening and closing of the diversion channel, and overload protection can be automatically achieved without external control.

[0030] 4. When the expansion airbag retracts, it actively discharges the fluid to achieve rapid fluid reflux; through the damping effect of the annular corrugation on the buffer spring, the auxiliary spool is delayed in resetting, which not only ensures the complete reflux of the fluid but also avoids the risk of secondary impact.

[0031] 5. Utilize the auxiliary spool to convert the received water hammer impact into its own displacement, drive the buffer spring to compress and deform, absorb the impact force, and achieve the purpose of primary water hammer reduction. Description of the Drawings

[0032] Figure 1 It is an overall three-dimensional view of the control valve of the present invention;

[0033] Figure 2 It is a three-dimensional view of the control valve of the present invention;

[0034] Figure 3 It is a three-dimensional view of the buffer assembly and the spool assembly of the present invention;

[0035] Figure 4 It is a three-dimensional view of the spool assembly of the present invention;

[0036] Figure 5 It is a three-dimensional view of the main spool of the present invention;

[0037] Figure 6 It is of the present invention Figure 5 Partial enlarged view of area A therein;

[0038] Figure 7 It is a three-dimensional view of the wing ring of the present invention;

[0039] Figure 8 It is a three-dimensional view of the first buffer of the present invention;

[0040] Figure 9 It is a three-dimensional view of the first buffer piece and the first transmission ring of the present invention;

[0041] Figure 10 It is a three-dimensional view of the force transmission assembly of the present invention.

[0042] In the figure: 1. Valve body; 2. Adjusting frame; 3. Handwheel; 4. Force transmission pipe; 5. Buffer assembly; 6. Spool assembly; 7. Valve stem; 8. Force transmission assembly; 51. Buffer pipe; 52. First buffer; 53. Force transmission rod; 54. Second buffer; 71. Adjusting thread; 72. Overflow passage; 61. Main spool; 62. Sub-spool; 63. Buffer spring; 64. Expansion airbag; 65. Opening and closing assembly; 66. Compression chamber; 611. Diversion passage; 612. Damping groove; 613. Sliding groove; 614. Buffer chamber; 651. Baffle; 652. Return spring; 653. Wing plate; 621. Wing ring; 521. First buffer housing; 522. First buffer plate; 523. First transmission ring; 5221. Transmission teeth; 5231. Ring teeth; 81. Force transmission housing; 82. Force transmission bent rod; 83. Piston head; 84. Connecting piece; 85. Liquid inlet. Detailed implementation manner

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] As Figures 1 - 10 shown, the present invention provides a technical solution for a control valve with a function of reducing water hammer: including a valve body 1 and a force transmission pipe 4. A valve stem 7 is slidably installed on the valve body 1. A spool assembly 6 is installed on the valve stem 7. An adjusting frame 2 is installed on the valve body 1. A handwheel 3 is rotatably installed on the adjusting frame 2. The handwheel 3 is threadedly connected to the valve stem 7. A buffer assembly 5 is installed on the water inlet side of the valve body 1. A force transmission assembly 8 is installed on the buffer assembly 5. One end of the force transmission pipe 4 is communicated with the valve stem 7, and the other end of the force transmission pipe 4 is communicated with the buffer assembly 5.

[0045] The valve stem 7 is slidably connected to the valve body 1 and can only slide up and down on the valve body 1. Since the handwheel 3 is threadedly connected to the valve stem 7, when the handwheel 3 rotates, the valve stem 7 is driven to slide up and down through the adjusting thread 71.

[0046] The spool assembly 6 includes a main spool 61. The main spool 61 is installed on the valve stem 7. A sub-spool 62 is slidably installed in the main spool 61. A buffer spring 63 is installed between the sub-spool 62 and the main spool 61. The sub-spool 62 is communicated with the valve stem 7. A compression chamber 66 is provided in the sub-spool 62. The compression chamber 66 is filled with a compression medium. An opening and closing assembly 65 is installed in the main spool 61. An expansion airbag 64 is installed on the main spool 61.

[0047] A buffer chamber 614 is provided on the main spool 61. A diversion channel 611 is provided on the main spool 61. One end of the diversion channel 611 communicates with the buffer chamber 614, and the other end of the diversion channel 611 communicates with the expansion airbag 64. The opening and closing assembly 65 is located at the entrance of the diversion channel 611. The secondary spool 62 is located in the buffer chamber 614. A sliding groove 613 is provided in the main spool 61, and the secondary spool 62 is slidably connected to the main spool 61 through the sliding groove 613.

[0048] A damping groove 612 is also provided in the main spool 61. Annular corrugations are provided on the wall of the damping groove 612. A wing ring 621 is provided on the secondary spool 62. The bottom end of the buffer spring 63 is connected to the wing ring 621, and the top end of the buffer spring 63 is connected to the top end of the damping groove 612. The annular corrugations in the damping groove 612 are used to apply damping to the compressed buffer spring 63 and delay the rebound time of the buffer spring 63.

[0049] The opening and closing assembly 65 includes a baffle 651. The baffle 651 is located at the entrance of the diversion channel 611. A wing plate 653 is provided on the baffle 651. A return spring 652 is installed between the wing plate 653 and the main spool 61. In the normal state, the baffle 651 blocks the entrance of the diversion channel 611.

[0050] An overflow channel 72 is provided in the valve stem 7. One end of the overflow channel 72 communicates with the compression chamber 66, and the other end of the overflow channel 72 communicates with the force transmission assembly 8 through the transmission pipe 4. An adjustment thread 71 is provided on the valve stem 7, and the valve stem 7 is threadedly connected to the handwheel 3 through the adjustment thread 71.

[0051] The force transmission assembly 8 includes a force transmission housing 81. The force transmission housing 81 is installed on the buffer assembly 5. A liquid inlet 85 is provided on the force transmission housing 81. The liquid inlet 85 communicates with the overflow channel 72 through the transmission pipe 4. A piston head 83 is slidably installed in the force transmission housing 81. A force transmission bent rod 82 is installed on the piston head 83. A connecting member 84 is installed at one end of the force transmission bent rod 82, and the connecting member 84 is connected to the buffer assembly 5.

[0052] The buffer assembly 5 includes a buffer pipe 51. The buffer pipe 51 is installed on the water inlet side of the valve body 1. A first buffer 52 and a second buffer 54 are provided on the buffer pipe 51. A force transmission rod 53 is installed between the first buffer 52 and the second buffer 54. The force transmission housing 81 is installed on the first buffer 52, and the connecting member 84 is connected to the first buffer 52.

[0053] The first buffer 52 includes a first buffer housing 521 which is installed on the buffer pipe 51. A force transmission housing 81 is installed on the first buffer housing 521. A number of first buffer plates 522 are rotatably installed inside the first buffer housing 521. A first transmission ring 523 is rotatably installed on the force transmission housing 81. The first buffer plates 522 are in meshing transmission with the first transmission ring 523. A connecting member 84 is connected to the first transmission ring 523, and a force transmission rod 53 is connected to the first transmission ring 523. Transmission teeth 5221 are provided on the first buffer plates 522, and a number of ring teeth 5231 are provided inside the first transmission ring 523. The transmission teeth 5221 are in meshing transmission with the ring teeth 5231.

[0054] The second buffer 54 includes a second buffer housing, a number of second buffer plates and a second transmission ring. The surface area of the second buffer plates is smaller than that of the first buffer plates 522. The second transmission ring is connected to the force transmission rod 53. The second buffer housing is installed on the buffer pipe 51. The second buffer plates are rotatably installed inside the second buffer housing. The second transmission ring is rotatably installed on the second buffer housing. The second transmission ring is in meshing transmission with the second buffer plates.

[0055] The internal structures of the first buffer 52 and the second buffer 54 are the same, except for the difference in the surface areas of the first buffer plates 522 and the second buffer plates. When the fluid flows through the unfolded first buffer plates 522 and the second buffer plates, after being blocked by the first buffer plates 522 and the second buffer plates, the flow rate decreases. The larger the blocking area of the buffer plates, the greater the blockage of the fluid. The resistance of the second buffer plates to the fluid is less than that of the first buffer plates 522. The first buffer plates 522 and the second buffer plates block the fluid step by step. After the flow rate and flow volume of the fluid are reduced, the impact force on the auxiliary valve core 62 is reduced.

[0056] The working principle of the present invention: When the control valve is in the open state, the fluid enters the valve body 1 from the pipeline through the buffer assembly 5, passes through the gap between the valve core assembly 6 and the valve body 1, and then flows out from the water outlet of the valve body 1. When flow regulation is required, by rotating the handwheel 3, the valve stem 7 is driven to slide up and down. The valve stem 7 drives the valve core assembly 6 to move, changing the gap between the main valve core 61 and the valve body 1. When the gap becomes larger, the flow rate increases; when the gap becomes smaller, the flow rate decreases, so as to achieve the purpose of flow regulation.

[0057] When the control valve is suddenly shut down, the bottom of the valve core assembly 6 is subjected to a water hammer impact. After being impacted, the auxiliary valve core 62 overcomes the elastic force of the buffer spring 63 and moves upward in the buffer chamber 614. When the impact force is small, the auxiliary valve core 62 moves slightly, and part of the impact force is absorbed through the deformation of the buffer spring 63, thereby reducing the water hammer impact force and achieving the purpose of primary water hammer reduction.

[0058] When the impact is relatively large, the secondary spool 62 generates a relatively large upward displacement. The volume of the compression chamber 66 inside the secondary spool 62 decreases. After the compressed medium is extruded, it successively enters the inside of the force transmission housing 81 from the overflow pipe, the force transmission pipe 4, and the liquid inlet 85. The compressed medium pushes the piston head 83 to make a curved displacement around the first transmission ring 523 inside the force transmission housing 81. The piston head 83 drives the force transmission bent rod 82 to extend out of the force transmission housing 81. The force transmission bent rod 82 drives the first transmission ring 523 to deflect on the first buffer housing 521 through the connecting piece 84. The first transmission ring 523 drives the engaged first buffer piece 522 to unfold. The first transmission ring 523 drives the second transmission ring to deflect through the force transmission rod 53. The second transmission ring drives the second buffer piece to unfold. The unfolded second buffer piece and the first buffer piece 522 perform step-by-step buffering on the subsequent fluid flowing to the control valve. At the same time, the second buffer piece and the first buffer piece 522 perform secondary buffering on the fluid flowing back after impacting the spool, so as to achieve the purpose of second-level reduction of water hammer.

[0059] The greater the impact on the secondary spool 62, the greater the upward displacement generated, and correspondingly, the greater the extrusion force of the compressed medium on the piston head 83. The greater the deflection angles of the force transmission bent rod 82 driving the first transmission ring 523 and the second transmission ring, and the higher the unfolding degrees of the second buffer piece and the first buffer piece 522, making the resistance of the second buffer piece and the first buffer piece 522 to the fluid greater, so as to achieve the purpose of automatically adjusting the second-level reduction intensity according to the strength of water hammer.

[0060] When the fluid impact force is too large, the secondary spool 62 is displaced upward to the top of the buffer chamber 614 under the action of the impact force. The wing ring 621 on the secondary spool 62 squeezes the buffer spring 63, and the buffer spring 63 completely contracts into the damping groove 612. At the same time, when the wing ring 621 moves to the height of the opening and closing assembly 65, it pushes the wing plate 653 to displace upward synchronously. The wing plate 653 drives the baffle 651 to lift upward, and the inlet of the diversion channel 611 is opened. The return spring 652 is compressed. The fluid rushes into the expansion airbag 64 from the diversion channel 611. After the water flow is diverted, the impact on the spool assembly 6 is reduced, achieving the purpose of third-level reduction of water hammer.

[0061] After the expansion airbag 64 is filled with fluid, it expands rapidly. When the water hammer dissipates, due to the damping exerted by the annular corrugation on the buffer spring 63 in the damping groove 612, it cannot rebound immediately. The secondary spool 62 remains at the top of the buffer chamber 614, and the diversion channel 611 remains open. At this time, the expansion airbag 64 rapidly retracts, and the fluid is extruded and flows back into the valve body 1 from the diversion channel 611. Then the buffer spring 63 gradually rebounds, and the secondary spool 62 is reset under the push of the buffer spring 63. The return spring 652 rebounds to drive the baffle 651 to block the inlet of the diversion channel 611 again.

[0062] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A control valve with a function of reducing water hammer, characterized in that: The control valve includes a valve body (1) and a force transmission pipe (4). A valve stem (7) is slidably installed on the valve body (1), and a valve core assembly (6) is installed on the valve stem (7). An adjusting frame (2) is installed on the valve body (1), and a handwheel (3) is rotatably installed on the adjusting frame (2). The handwheel (3) is threadedly connected to the valve stem (7). A buffer assembly (5) is installed on the water inlet side of the valve body (1), and a force transmission assembly (8) is installed on the buffer assembly (5). One end of the force transmission pipe (4) is communicated with the valve stem (7), and the other end of the force transmission pipe (4) is communicated with the buffer assembly (5). An overflow passage (72) is provided in the valve stem (7), and one end of the overflow passage (72) is communicated with the force transmission assembly (8) through the force transmission pipe (4). The force transmission assembly (8) includes a force transmission housing (81). The force transmission housing (81) is installed on the buffer assembly (5). A liquid inlet (85) is provided on the force transmission housing (81), and the liquid inlet (85) is communicated with the overflow passage (72) through the force transmission pipe (4). A piston head (83) is slidably installed in the force transmission housing (81), and a force transmission bent rod (82) is installed on the piston head (83). A connecting member (84) is installed at one end of the force transmission bent rod (82), and the connecting member (84) is connected to the buffer assembly (5). The valve core assembly (6) includes a main valve core (61). The main valve core (61) is installed on the valve stem (7). A sub-valve core (62) is slidably installed in the main valve core (61). A buffer spring (63) is installed between the sub-valve core (62) and the main valve core (61). The sub-valve core (62) is communicated with the valve stem (7). A compression chamber (66) is provided in the sub-valve core (62), and a compression medium is filled in the compression chamber (66). An opening and closing assembly (65) is installed in the main valve core (61), and an expansion airbag (64) is installed on the main valve core (61). One end of the overflow passage (72) is communicated with the compression chamber (66). The buffer assembly (5) includes a buffer pipe (51). The buffer pipe (51) is installed on the water inlet side of the valve body (1). A first buffer (52) and a second buffer (54) are provided on the buffer pipe (51). A force transmission rod (53) is installed between the first buffer (52) and the second buffer (54). The force transmission housing (81) is installed on the first buffer (52), and the connecting member (84) is connected to the first buffer (52). The first buffer (52) includes a first buffer housing (521). The first buffer housing (521) is mounted on a buffer tube (51). A force transmission housing (81) is mounted on the first buffer housing (521). A number of first buffer plates (522) are rotatably mounted inside the first buffer housing (521). A first transmission ring (523) is rotatably mounted on the force transmission housing (81). The first buffer plates (522) are in meshing transmission with the first transmission ring (523). The connecting member (84) is connected to the first transmission ring (523). The force transmission rod (53) is connected to the first transmission ring (523). Transmission teeth (5221) are provided on the first buffer plates (522). A number of ring teeth (5231) are provided inside the first transmission ring (523). The transmission teeth (5221) are in meshing transmission with the ring teeth (5231). The second buffer (54) includes a number of second buffer plates. The internal structures of the first buffer (52) and the second buffer (54) are the same, except for the surface areas of the first buffer plates (522) and the second buffer plates.

2. The control valve with a function of reducing water hammer according to claim 1, characterized in that: A buffer chamber (614) is provided on the main spool valve (61). A diversion orifice passage (611) is provided on the main spool valve (61). One end of the diversion orifice passage (611) communicates with the buffer chamber (614). The other end of the diversion orifice passage (611) communicates with an expansion airbag (64). The opening and closing assembly (65) is located at the inlet of the diversion orifice passage (611). The auxiliary spool valve (62) is located inside the buffer chamber (614). A sliding groove (613) is provided inside the main spool valve (61). The auxiliary spool valve (62) is slidably connected to the main spool valve (61) through the sliding groove (613).

3. The control valve with a function of reducing water hammer according to claim 2, characterized in that: A damping groove (612) is further provided inside the main spool valve (61). Annular corrugations are provided on the wall of the damping groove (612). A wing ring (621) is provided on the auxiliary spool valve (62). The bottom end of the buffer spring (63) is connected to the wing ring (621). The top end of the buffer spring (63) is connected to the top end of the damping groove (612).

4. A control valve with a function of reducing water hammer according to claim 2, characterized in that: The opening and closing assembly (65) includes a baffle (651). The baffle (651) is located at the inlet of the diversion orifice passage (611). A wing plate (653) is provided on the baffle (651). A return spring (652) is mounted between the wing plate (653) and the main spool valve (61).

5. A control valve with a function of reducing water hammer according to claim 1, characterized in that: Adjusting threads (71) are provided on the valve stem (7). The valve stem (7) is threadedly connected to the handwheel (3) through the adjusting threads (71).

6. The control valve with a function of reducing water hammer according to claim 5, characterized in that: The second buffer (54) further includes a second buffer housing and a second transmission ring. The surface area of the second buffer plates is smaller than that of the first buffer plates (522). The second transmission ring is connected to the force transmission rod (53). The second buffer housing is mounted on the buffer tube (51). The second buffer plates are rotatably mounted inside the second buffer housing. The second transmission ring is rotatably mounted on the second buffer housing. The second transmission ring is in meshing transmission with the second buffer plates.

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