Control valve with water hammer reduction function

Abstract

The invention discloses a control valve with a water hammer reducing function, and relates to the technical field of control valves. Comprising a valve body, an adjusting frame, a hand wheel, a force transmission pipe, a buffering assembly, a valve element assembly, a valve rod and a force transmission assembly, kinetic energy generated by fluid impact force is converted into mechanical transmission energy for deflection of a first transmission ring and a second transmission ring through a compression medium, and finally the purpose of driving a buffering piece to be unfolded without external force is achieved. The first buffer plate and the second buffer plate are synchronously unfolded to form a double buffer barrier, so that the impact energy of the water hammer is effectively dispersed. Not only is forward impact fluid buffered step by step, but also secondary energy absorption is carried out on reverse flow fluid, so that the purpose of secondary reduction of water hammer is achieved. Through the design of the variable-volume compression chamber, the compression chamber can automatically generate adaptive change according to the impact force of the water hammer, so that the first buffer plate and the second buffer plate can be driven to be expanded by a corresponding angle in a self-adaptive manner according to the impact force of the water hammer.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, in particular to a control valve with a water hammer reduction function. Background Art

[0002] Control valves play a key role in various pipeline systems. They can not only achieve precise control of fluids, but also quickly cut off the flow of media when needed to ensure system safety and stability. Control valves adjust the flow rate and flow of fluids by changing the valve opening, so that the system can operate under optimal conditions according to design requirements. Control valves not only play a role in regulation and protection in daily operation, but are also important equipment to ensure system safety in emergency situations.

[0003] However, there are still many problems to be overcome in the use of control valves. When water 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 flow rate, thereby generating an instantaneous high-pressure shock wave. The instantaneous high-pressure shock wave generated by the water hammer effect will cause the control valve to withstand pressure beyond the design load range, causing mechanical fatigue, deformation and even rupture of the valve body and internal components, while accelerating the wear of seals and sealing surfaces. The vibration generated will also affect 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 object of the present invention is to provide a control valve with a water hammer reduction function to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a control valve with the function of reducing water hammer, comprising a valve body and a force transmission tube, a valve stem is slidably mounted on the valve body, a valve core assembly is mounted on the valve stem, an adjusting frame is mounted on the valve body, a hand wheel is rotatably mounted on the adjusting frame, the hand wheel is threadedly connected to the valve stem, a buffer assembly is mounted on the water inlet side of the valve body, a force transmission assembly is mounted on the buffer assembly, one end of the force transmission tube is connected to the valve stem, and the other end of the force transmission tube is connected to 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 is turned, the valve stem is driven to slide 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 valve body outlet. When flow adjustment is required, the hand wheel is rotated to drive the valve stem to slide up and down, and the valve stem drives the valve core assembly to move, changing the gap between the main valve core and the valve body. The larger the gap, the greater the flow, and the smaller the gap, the less the flow, thereby achieving the purpose of flow adjustment.

[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 in the main valve core, a buffer spring is installed between the secondary valve core and the main valve core, the secondary valve core is connected to the valve stem, a compression chamber is provided in the secondary valve core, the compression chamber is filled with compressed medium, an opening and closing assembly is installed in the main valve core, and an expansion air bag is installed on the main valve core.

[0009] When the control valve is suddenly closed, the bottom of the valve core assembly is impacted by water hammer. After the impact, the auxiliary 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 auxiliary valve core moves slightly and absorbs part of the impact force through the deformation of the buffer spring, thereby reducing the water hammer impact force and achieving the purpose of primary reduction of water hammer.

[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 connected to the buffer chamber, and the other end of the diversion channel is connected to the expansion airbag. The opening and closing assembly is located at the entrance of the diversion channel, and the auxiliary valve core is located in the buffer chamber. A sliding groove is provided in the main valve core, and the auxiliary valve core is slidably connected to the main valve core through the sliding groove.

[0012] Furthermore, a damping groove is provided in the main valve core, an annular corrugation is provided on the wall of the damping groove, a wing ring is provided on the auxiliary 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 corrugation in the damping groove is 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, and a wing plate is provided on the baffle, and a return spring is installed between the wing plate and the main valve core.

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

[0016] When the impact force of the fluid is too large, the auxiliary valve core moves upward to the top of the buffer chamber under the action of the impact force, and the wing ring on the auxiliary valve core squeezes the buffer spring, and the buffer spring is completely contracted 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, and the wing plate drives the baffle plate to lift upward, the entrance of the diversion channel opens, the reset spring is compressed, and the fluid rushes into the expansion airbag from the diversion channel. After the water flow is drained, the impact on the valve core assembly is reduced, thereby achieving the purpose of three-level reduction of water hammer.

[0017] After the expansion bag is filled with fluid, it expands rapidly. When the water hammer dissipates, the buffer spring in the damping groove is damped by the annular corrugation and cannot rebound immediately. The auxiliary valve core is still located at the top of the buffer chamber, and the diversion channel remains open. At this time, the expansion bag shrinks rapidly, and the fluid is squeezed out and flows back into the valve body from the diversion channel. After that, the buffer spring gradually rebounds, and the auxiliary valve core is reset under the push of the buffer spring. The rebound of the reset spring drives the baffle to block the entrance of the diversion channel again.

[0018] Furthermore, an overflow channel is provided in the valve stem, one end of the overflow channel is connected to the compression chamber, and the other end of the overflow channel is connected to the force transmission component through the force transmission tube. An adjusting thread is provided on the valve stem, and the valve stem is connected to the handwheel thread through the adjusting thread.

[0019] Furthermore, the force transmission assembly includes a force transmission shell, which is installed on the buffer assembly. A liquid inlet is provided on the force transmission shell, and the liquid inlet is connected to the overflow channel through a force transmission pipe. A piston head is slidably installed in the force transmission shell, and a force transmission bent rod is installed on the piston head. A connecting piece is installed at one end of the force transmission bent rod, and the connecting piece is connected to the buffer assembly.

[0020] When the impact is large, the auxiliary valve core produces a large upward displacement, and the volume of the compression chamber in the auxiliary valve core is reduced. After the compressed medium is squeezed, it enters the inside of the force transmission shell from the overflow pipe, the force transmission pipe and the liquid inlet in turn. The compressed medium pushes the piston head to make a curved displacement around the first transmission ring in the force transmission shell, and the piston head drives the force transmission bent rod to extend out of the force transmission shell. The force transmission bent rod drives the first transmission ring to deflect on the first buffer shell through the connecting piece, and the first transmission ring drives the first buffer plate engaged therewith to unfold, and the first transmission ring drives the second transmission ring to deflect through the force transmission rod, and the second transmission ring drives the second buffer plate to unfold, and the unfolded second buffer plate and the first buffer plate buffer the subsequent fluid flowing to the control valve step by step. At the same time, the second buffer plate and the first buffer plate buffer the fluid that flows back after impacting the valve core for the second time, thereby achieving the purpose of secondary reduction of water hammer.

[0021] The greater the impact on the auxiliary valve core, the greater the upward displacement, the corresponding compression medium exerts a greater squeezing force on the piston head, the greater the deflection angle of the first transmission ring and the second transmission ring driven by the force transmission bending rod, the higher the expansion degree of the second buffer plate and the first buffer plate, and the greater the resistance of the second buffer plate and the first buffer plate to the fluid, thereby achieving the purpose of automatically adjusting the secondary reduction intensity according to the strength of the water hammer.

[0022] Furthermore, the buffer assembly includes a buffer tube, which is installed on the water inlet side of the valve body. The buffer tube is provided with a first buffer and a second buffer. A force transmission rod is installed between the first buffer and the second buffer. The force transmission shell 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: 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.

[0027] 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.

[0028] 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.

[0029] 4. When the inflatable airbag retracts, the fluid is actively discharged to achieve rapid fluid reflux; through the damping effect of the annular corrugation on the buffer spring, the secondary valve core is delayed in resetting, which not only ensures the complete reflux of the fluid, but also avoids the risk of secondary impact.

[0030] 5. Use the auxiliary valve core to convert the water hammer impact into its own displacement, and drive the buffer spring to compress and deform, absorb the impact force, and achieve the purpose of primary reduction of water hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an overall stereogram of the control valve of the present invention; Figure 2 is a three-dimensional diagram of a control valve of the present invention; Figure 3 A three-dimensional diagram of a buffer assembly and a valve core assembly of the present invention; Figure 4 A three-dimensional diagram of the valve core assembly of the present invention; Figure 5 A three-dimensional diagram of the main valve core of the present invention; Figure 6 For the present invention Figure 5 A partial enlarged view of the middle A area; Figure 7 is a three-dimensional diagram of the wing ring of the present invention; Figure 8 is a three-dimensional diagram of a first buffer of the present invention; Fig. 9 A three-dimensional diagram of the first buffer sheet and the first transmission ring of the present invention; Fig.10 It is a stereoscopic diagram of the force transmission component of the present invention.

[0032] In the figure: 1, valve body; 2, adjustment frame; 3, hand wheel; 4, force transmission tube; 5, buffer assembly; 6, valve core assembly; 7, valve stem; 8, force transmission assembly; 51, buffer tube; 52, first buffer; 53, force transmission rod; 54, second buffer; 71, adjustment thread; 72, overflow channel; 61, main valve core; 62, auxiliary valve core; 63, buffer spring; 64, expansion airbag; 65, opening and closing assembly; 66, compression chamber; 61 1. diversion channel; 612. damping groove; 613. sliding groove; 614. buffer chamber; 651. baffle; 652. return spring; 653. wing plate; 621. wing ring; 521. first buffer shell; 522. first buffer sheet; 523. first transmission ring; 5221. transmission tooth; 5231. ring tooth; 81. force transmission shell; 82. force transmission bent rod; 83. piston head; 84. connecting piece; 85. liquid inlet. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-Figure 10 As shown, the present invention provides a technical solution of a control valve with a water hammer reduction function: comprising a valve body 1 and a force transmission tube 4, a valve stem 7 is slidably mounted on the valve body 1, a valve core assembly 6 is mounted on the valve stem 7, an adjusting frame 2 is mounted on the valve body 1, a hand wheel 3 is rotatably mounted on the adjusting frame 2, the hand wheel 3 is threadedly connected to the valve stem 7, a buffer assembly 5 is mounted on the water inlet side of the valve body 1, a force transmission assembly 8 is mounted on the buffer assembly 5, one end of the force transmission tube 4 is connected to the valve stem 7, and the other end of the force transmission tube 4 is connected to the buffer assembly 5.

[0035] 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 hand wheel 3 is threadedly connected to the valve stem 7, when the hand wheel 3 rotates, the valve stem 7 is driven to slide up and down through the adjusting thread 71.

[0036] The valve core assembly 6 includes a main valve core 61, which is installed on the valve stem 7. A secondary valve core 62 is slidably installed in the main valve core 61. A buffer spring 63 is installed between the secondary valve core 62 and the main valve core 61. The secondary valve core 62 is connected to the valve stem 7. A compression chamber 66 is provided in the secondary valve core 62. The compression chamber 66 is filled with compressed medium. An opening and closing assembly 65 is installed in the main valve core 61, and an expansion air bag 64 is installed on the main valve core 61.

[0037] A buffer chamber 614 is provided on the main valve core 61, and a guide channel 611 is provided on the main valve core 61. One end of the guide channel 611 is connected to the buffer chamber 614, and the other end of the guide channel 611 is connected to the expansion airbag 64. The opening and closing component 65 is located at the entrance of the guide channel 611, and the auxiliary valve core 62 is located in the buffer chamber 614. A sliding groove 613 is provided in the main valve core 61, and the auxiliary valve core 62 is slidably connected to the main valve core 61 through the sliding groove 613.

[0038] A damping groove 612 is also provided in the main valve core 61, and an annular corrugation is provided on the groove wall of the damping groove 612. A wing ring 621 is provided on the auxiliary valve core 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 corrugation in the damping groove 612 is used to apply damping to the compressed buffer spring 63, delaying the rebound time of the buffer spring 63.

[0039] The opening and closing assembly 65 includes a baffle 651, which is located at the entrance of the diversion channel 611. The baffle 651 is provided with a wing plate 653, and a return spring 652 is installed between the wing plate 653 and the main valve core 61. Under normal conditions, the baffle 651 blocks the entrance of the diversion channel 611.

[0040] An overflow channel 72 is provided in the valve stem 7, one end of the overflow channel 72 is connected to the compression chamber 66, and the other end of the overflow channel 72 is connected to the force transmission component 8 through the force transmission tube 4. An adjusting thread 71 is provided on the valve stem 7, and the valve stem 7 is threadedly connected to the handwheel 3 through the adjusting thread 71.

[0041] The force transmission assembly 8 includes a force transmission housing 81, which 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 connected to the overflow channel 72 through the force transmission tube 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 piece 84 is installed at one end of the force transmission bent rod 82, and the connecting piece 84 is connected to the buffer assembly 5.

[0042] The buffer assembly 5 includes a buffer tube 51, which is installed on the water inlet side of the valve body 1. The buffer tube 51 is provided with a first buffer 52 and a second buffer 54. A force transmission rod 53 is installed between the first buffer 52 and the second buffer 54. The force transmission shell 81 is installed on the first buffer 52, and the connecting piece 84 is connected to the first buffer 52.

[0043] The first buffer 52 includes a first buffer shell 521, which is installed on the buffer tube 51. A force transmission shell 81 is installed on the first buffer shell 521. A plurality of first buffer plates 522 are rotatably installed in the first buffer shell 521. A first transmission ring 523 is rotatably installed on the force transmission shell 81. The first buffer plate 522 is meshed with the first transmission ring 523 for transmission. The connecting piece 84 is connected to the first transmission ring 523, and the force transmission rod 53 is connected to the first transmission ring 523. Transmission teeth 5221 are provided on the first buffer plate 522, and a plurality of ring teeth 5231 are provided in the first transmission ring 523. The transmission teeth 5221 are meshed with the ring teeth 5231 for transmission.

[0044] The second buffer 54 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 522. The second transmission ring is connected to the force transmission rod 53. The second buffer shell is installed on the buffer tube 51. 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.

[0045] The first buffer 52 has the same internal structure as the second buffer 54, and only the surface area of ​​the first buffer sheet 522 and the second buffer sheet is different. When the fluid flows through the unfolded first buffer sheet 522 and the second buffer sheet, the flow rate is reduced after being blocked by the first buffer sheet 522 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 522. The first buffer sheet 522 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 62 is reduced.

[0046] The working principle of the present invention is as follows: 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, the hand wheel 3 is rotated to drive the valve stem 7 to slide up and down, and 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 increases, and when the gap becomes smaller, the flow decreases, thereby achieving the purpose of flow regulation.

[0047] When the control valve is suddenly closed, the bottom of the valve core assembly 6 is impacted by water hammer, and the auxiliary valve core 62 overcomes the elastic force of the buffer spring 63 after being impacted and moves upward in the buffer chamber 614. When the impact force is small, the auxiliary valve core 62 moves slightly, and the deformation of the buffer spring 63 absorbs part of the impact force, thereby reducing the impact force of the water hammer, achieving the purpose of primary reduction of the water hammer.

[0048] When the impact is large, the auxiliary valve core 62 produces a large upward displacement, and the volume of the compression chamber 66 in the auxiliary valve core 62 decreases. After being squeezed, the compressed medium enters the inside of the force transmission housing 81 from the overflow pipe, the force transmission pipe 4 and the liquid inlet 85 in turn. The compressed medium pushes the piston head 83 to make a curved displacement around the first transmission ring 523 in 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 first buffer sheet 522 engaged therewith 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 sheet to unfold. The unfolded second buffer sheet and the first buffer sheet 522 buffer the subsequent fluid flowing to the control valve step by step. At the same time, the second buffer sheet and the first buffer sheet 522 buffer the fluid that flows back after impacting the valve core for the second time, thereby achieving the purpose of secondary reduction of water hammer.

[0049] The greater the impact on the auxiliary valve core 62, the greater the upward displacement, the corresponding compression medium exerts a greater squeezing force on the piston head 83, the greater the deflection angle of the first transmission ring 523 and the second transmission ring driven by the force transmission bent rod 82, the higher the expansion degree of the second buffer plate and the first buffer plate 522, and the greater the resistance of the second buffer plate and the first buffer plate 522 to the fluid, thereby achieving the purpose of automatically adjusting the secondary reduction intensity according to the strength of the water hammer.

[0050] When the impact force of the fluid is too large, the auxiliary valve core 62 moves upward to the top of the buffer chamber 614 under the action of the impact force, and the wing ring 621 on the auxiliary valve core 62 squeezes the buffer spring 63, and the buffer spring 63 is completely retracted into the damping groove 612. At the same time, when the wing ring 621 moves to the height of the opening and closing component 65, it pushes the wing plate 653 to move upward synchronously, and the wing plate 653 drives the baffle plate 651 to lift upward, the entrance of the diversion channel 611 opens, and the reset spring 652 is compressed. The fluid rushes into the expansion airbag 64 from the diversion channel 611. After the water flow is drained, the impact on the valve core component 6 is reduced, thereby achieving the purpose of three-level reduction of water hammer.

[0051] After the expansion bag 64 is filled with fluid, it expands rapidly. When the water hammer dissipates, the buffer spring 63 in the damping groove 612 is damped by the annular corrugation and cannot rebound immediately. The auxiliary valve core 62 is still located at the top of the buffer chamber 614, and the diversion channel 611 remains open. At this time, the expansion bag 64 shrinks rapidly, and the fluid is squeezed out and flows back into the valve body 1 from the diversion channel 611. Then the buffer spring 63 rebounds gradually, and the auxiliary valve core 62 is reset under the push of the buffer spring 63. The reset spring 652 rebounds and drives the baffle 651 to block the entrance of the diversion channel 611 again.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A control valve with water hammer mitigation function, characterized in that: The control valve comprises a valve body (1) and a force transmission tube (4); a valve stem (7) is slidably mounted on the valve body (1); a valve core assembly (6) is mounted on the valve stem (7); an adjusting frame (2) is mounted on the valve body (1); a hand wheel (3) is rotatably mounted on the adjusting frame (2); the hand wheel (3) is threadedly connected to the valve stem (7); a buffer assembly (5) is mounted on the water inlet side of the valve body (1); a force transmission assembly (8) is mounted on the buffer assembly (5); one end of the force transmission tube (4) is connected to the valve stem (7); and the other end of the force transmission tube (4) is connected to the buffer assembly (5).

2. A control valve with water hammer mitigation function according to claim 1, characterized in that: The valve core assembly (6) comprises a main valve core (61), wherein the main valve core (61) is mounted on a valve stem (7), a secondary valve core (62) is slidably mounted in the main valve core (61), a buffer spring (63) is mounted between the secondary valve core (62) and the main valve core (61), the secondary valve core (62) is communicated with the valve stem (7), a compression chamber (66) is arranged in the secondary valve core (62), and the compression chamber (66) is filled with a compressed medium, an opening and closing assembly (65) is mounted in the main valve core (61), and an expansion air bag (64) is mounted on the main valve core (61).

3. A control valve with water hammer mitigation function according to claim 2, characterized in that: The main valve core (61) is provided with a buffer chamber (614), the main valve core (61) is provided with a flow guide channel (611), one end of the flow guide channel (611) is communicated with the buffer chamber (614), and the other end of the flow guide channel (611) is communicated with the expansion airbag (64), the opening and closing component (65) is located at the entrance of the flow guide channel (611), the auxiliary valve core (62) is located in the buffer chamber (614), the main valve core (61) is provided with a sliding groove (613), and the auxiliary valve core (62) is slidably connected to the main valve core (61) through the sliding groove (613).

4. A control valve with water hammer mitigation function according to claim 3, characterized in that: A damping groove (612) is also provided in the main valve core (61), and an annular corrugation is provided on the groove wall of the damping groove (612). A wing ring (621) is provided on the auxiliary valve core (62), and 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).

5. The control valve with water hammer mitigation function according to claim 3, characterized in that: The opening and closing assembly (65) comprises a baffle (651), the baffle (651) being located at the entrance of the diversion channel (611), a wing plate (653) being provided on the baffle (651), and a return spring (652) being installed between the wing plate (653) and the main valve core (61).

6. A control valve with water hammer mitigation function according to claim 2, characterized in that: An overflow channel (72) is provided in the valve stem (7), one end of the overflow channel (72) is in communication with the compression chamber (66), and the other end of the overflow channel (72) is in communication with the force transmission component (8) via the force transmission tube (4). An adjusting thread (71) is provided on the valve stem (7), and the valve stem (7) is threadably connected to the hand wheel (3) via the adjusting thread (71).

7. A control valve with water hammer mitigation function according to claim 6, characterized in that: The force transmission assembly (8) comprises a force transmission housing (81), the force transmission housing (81) being mounted on the buffer assembly (5), the force transmission housing (81) being provided with a liquid inlet (85), the liquid inlet (85) being connected to the overflow channel (72) via a force transmission pipe (4), a piston head (83) being slidably mounted in the force transmission housing (81), a force transmission bent rod (82) being mounted on the piston head (83), a connecting piece (84) being mounted on one end of the force transmission bent rod (82), and the connecting piece (84) being connected to the buffer assembly (5).

8. The control valve with water hammer mitigation function according to claim 7, characterized in that: The buffer assembly (5) comprises a buffer tube (51), the buffer tube (51) being mounted on the water inlet side of the valve body (1), the buffer tube (51) being provided with a first buffer (52) and a second buffer (54), a force transmission rod (53) being mounted between the first buffer (52) and the second buffer (54), the force transmission housing (81) being mounted on the first buffer (52), and the connecting member (84) being connected to the first buffer (52).

9. A control valve with water hammer mitigation function according to claim 8, characterized in that: The first buffer (52) comprises a first buffer shell (521), the first buffer shell (521) is mounted on the buffer tube (51), a force transmission shell (81) is mounted on the first buffer shell (521), a plurality of first buffer plates (522) are rotatably mounted in the first buffer shell (521), a first transmission ring (523) is rotatably mounted on the force transmission shell (81), the first buffer plate (522) and the first transmission ring (523) are meshed for transmission, the connecting member (84) is connected to the first transmission ring (523), and the force transmission rod (53) is connected to the first transmission ring (523); the first buffer plate (522) is provided with transmission teeth (5221), a plurality of ring teeth (5231) are provided in the first transmission ring (523), and the transmission teeth (5221) and the ring teeth (5231) are meshed for transmission.

10. A control valve with water hammer mitigation function according to claim 9, characterized in that: The second buffer (54) comprises a second buffer shell, a plurality of second buffer sheets and a second transmission ring, the surface area of ​​the second buffer sheet is smaller than the surface area of ​​the first buffer sheet (522), the second transmission ring is connected to the force transmission rod (53), the second buffer shell is mounted on the buffer tube (51), the second buffer sheet is rotatably mounted in the second buffer shell, the second transmission ring is rotatably mounted on the second buffer shell, and the second transmission ring is meshed with the second buffer sheet for transmission.

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