A two-stage low-torque flow and pressure regulating valve

Abstract

The present invention discloses a two-stage low-torque flow and pressure regulating valve, belonging to the technical field of flow and pressure regulating valves, comprising: a flow and pressure regulating valve body, with a liquid inlet and a liquid outlet respectively provided at both ends of the flow and pressure regulating valve body, and a through cavity is provided inside the flow and pressure regulating valve body; a partition part, which divides the through cavity into an outer cavity and an inner cavity, a first inlet and a second inlet are sequentially arranged on one side of the partition part, and a main valve port is arranged between the inner cavity and the liquid outlet; a piston, which is slidably arranged inside the inner cavity, and a secondary valve port penetrating through the piston is arranged on the piston; a valve rod, which is arranged inside the inner cavity, the valve rod is slidably connected with the piston, a sealing member is arranged at one end of the valve rod located inside the inner cavity, and an impact part is arranged at one end of the valve rod located inside the liquid outlet; a crank and connecting rod drive assembly, which is arranged inside the inner cavity, solves the problem that the current piston-type pressure regulating valve has a large torque during startup and cannot adjust the changes in fluid flow rate and pressure in a timely manner.

Description

Technical Field

[0001] The present invention relates to the technical field of flow - regulating and pressure - regulating valves, and particularly to a two - stage low - torque flow - regulating and pressure - regulating valve. Background Art

[0002] As a key component in fluid systems, pressure - regulating valves are widely used in various industrial and civil fields. Among them, piston - type pressure - regulating valves dominate among various types of pressure - regulating valves due to their relatively mature technology and wide applicability. Its working mechanism is based on the principle of mechanical transmission. Through a driving structure, such as an electric motor, a hydraulic driving device, etc., initial power is provided for the entire pressure - regulating process. The driving structure drives the valve stem to rotate, and the rotational movement of the valve stem is converted into the reciprocating linear movement of the piston via a crank - connecting rod mechanism. In this process, the movement of the piston in the valve body changes the cross - sectional area of fluid flow, thereby achieving the regulation of fluid flow rate and pressure.

[0003] However, in practical applications, the existing piston - type pressure - regulating valves have the problem of a large starting torque. This problem mainly stems from their mechanical structure and working mode. A large starting torque not only requires a higher power for the driving structure, increasing energy consumption and equipment costs, but also easily causes premature wear of the components of the driving structure, reducing the service life of the equipment and increasing maintenance costs. At the same time, in some occasions with high requirements for response speed, a large starting torque will cause the pressure - regulating valve to respond sluggishly, unable to adjust the fluid flow rate and pressure changes in a timely manner, affecting the operation stability and reliability of the entire system.

[0004] In the utility model with the application number: CN202320406392.6, a piston - type flow - regulating and pressure - regulating valve is disclosed, which includes a pressure - regulating valve outer housing and an anti - shock component. An inner housing is installed inside the pressure - regulating valve outer housing, and a driving motor is installed outside the inner housing. At the same time, the driving motor is fixed to the driving seat through an output shaft, and one end of the driving seat is movably connected to a crank mechanism. The end of the crank mechanism away from the driving seat is movably connected to a piston. A sliding channel is installed on the left side of the inner housing, and the piston is slidably arranged inside the sliding channel. At the same time, a throttling component is installed on the left side of the piston. It still has the problem of a large starting torque and being unable to adjust the fluid flow rate and pressure changes in a timely manner. Summary of the Invention

[0005] Based on this, in view of the above problems, the present invention proposes a two - stage low - torque flow - regulating and pressure - regulating valve, which solves the problems of the existing piston - type pressure - regulating valve having a large starting torque and being unable to adjust the fluid flow rate and pressure changes in a timely manner.

[0006] The technical solution of the present invention is as follows:

[0007] A two - stage low - torque flow - regulating and pressure - regulating valve, comprising:

[0008] A flow - regulating and pressure - regulating valve body has a liquid inlet and a liquid outlet provided at both ends respectively. A through - cavity is provided inside the flow - regulating and pressure - regulating valve body;

[0009] A partition part is arranged in the through - cavity. The partition part divides the through - cavity into an outer cavity and an inner cavity. One end of the outer cavity is communicated with the liquid inlet, and one end of the inner cavity is communicated with the liquid outlet. A first inlet and a second inlet are successively arranged on one side of the partition part close to the liquid outlet. A main valve port is arranged between the inner cavity and the liquid outlet;

[0010] A piston is slidably arranged in the inner cavity. The piston is used to control the opening or closing of the second inlet and the main valve port. A secondary valve port penetrating through the piston is provided on the piston, and the secondary valve port is used to communicate the inner cavity and the liquid outlet;

[0011] A valve rod is arranged in the inner cavity. One end of the valve rod penetrates through the piston and extends into the liquid outlet. The valve rod is slidably connected with the piston. A sealing member is arranged at one end of the valve rod located in the inner cavity. The sealing member can move along with the valve rod to contact the piston, used to control the opening or closing of the secondary valve port. At the same time, the sealing member is also used to drive the piston to close the second inlet and the main valve port. An impact part is arranged at one end of the valve rod located in the liquid outlet. The impact part can move along with the valve rod to contact the piston, used to drive the piston to open the second inlet and the main valve port;

[0012] A crank - connecting rod driving assembly is arranged in the inner cavity and is cooperatively arranged with the valve rod to drive the valve rod to reciprocate.

[0013] Preferably, the flow - regulating and pressure - regulating valve body comprises a left valve body and a right valve body. The liquid inlet is arranged on the left valve body, and the liquid outlet is arranged on the right valve body. A first connecting flange is fixedly arranged on the left valve body, and a second connecting flange is fixedly arranged on the right valve body. The first connecting flange and the second connecting flange are detachably connected by a plurality of bolts. An insertion ring is arranged on the left valve body. The insertion ring is fixedly connected with the left valve body. The insertion ring can be inserted into the right valve body and is slidably connected with the right valve body.

[0014] Preferably, the partition part comprises a diversion shell and a diversion cylinder. The diversion shell is arranged in the left valve body and is connected with the inner side wall of the left valve body by a plurality of connecting plates. One end of the plurality of connecting plates is fixedly connected with the inner side wall of the left valve body, and the other end is fixedly connected with the outer side wall of the diversion shell. The diversion cylinder is arranged in the right valve body. One end of the diversion cylinder is fixedly connected with one end of the right valve body close to the liquid outlet, and the other end can be inserted into the diversion shell and is detachably connected with the diversion shell. The first inlet and the second inlet are respectively arranged at both ends of the diversion cylinder, and the second inlet is located at one end of the diversion cylinder close to the liquid outlet. A part of the inner cavity is located in the diversion cylinder, and another part is located in the diversion shell. The valve rod is arranged in the inner cavity located in the diversion cylinder.

[0015] Preferably, the piston is arranged in the inner cavity located within the flow guide cylinder and is slidably connected to the inner side wall of the flow guide cylinder. The end of the piston near the liquid outlet can contact the inner side wall of the right valve body. A main sealing ring is provided at the end of the piston that contacts the inner side wall of the right valve body. The main sealing ring is embedded and installed on the piston and can contact the inner side wall of the right valve body to control the opening or closing of the main valve port.

[0016] Preferably, annular metal blades are provided on the outer sides of both ends of the piston. The annular metal blades are fixedly connected to the piston. When the piston reciprocates, the annular metal blade on the piston near the liquid outlet can cut the impurities stuck at the second inlet, and the annular metal blade at the other end can cut the impurities stuck at the first inlet.

[0017] Preferably, the closing member includes a fixed disk and an insertion rod arranged in cooperation with the secondary valve port. The fixed disk is fixedly arranged at one end of the valve stem located within the flow guide cylinder. One end of the insertion rod is fixedly arranged on the fixed disk, and the other end can be inserted into the secondary valve port to close the secondary valve port.

[0018] Preferably, the impact portion includes a contact ring and a locking nut. The end of the valve stem located within the liquid outlet is provided with a first mounting portion. The locking nut is arranged on the first mounting portion and is detachably connected to the first mounting portion by a thread. A second mounting portion is provided between the first mounting portion and the valve stem. The contact ring is arranged on the second mounting portion, and the locking nut is used to fix the contact ring on the second mounting portion.

[0019] Preferably, the crank - connecting rod drive assembly includes a first connecting seat, a second connecting seat, a connecting rod, a rotating rod, and a driving member. The rotating rod is arranged within the flow guide housing. One end of the rotating rod is rotatably connected to the inner side wall of the flow guide housing, and the other end passes through the flow guide housing and the left valve body and extends outside the left valve body. The rotating rod is rotatably connected to the flow guide housing and the left valve body respectively. The first connecting seat is arranged within the flow guide housing and is fixedly connected to one end of the rotating rod. The second connecting seat is fixedly arranged at the end of the valve stem located within the flow guide cylinder. Both ends of the connecting rod are rotatably connected to the first connecting seat and the second connecting seat respectively. The driving member is arranged outside the flow - regulating and pressure - regulating valve body and is arranged in cooperation with the end of the rotating rod outside the left valve body to drive the rotating rod.

[0020] Preferably, the driving member is a worm - gear and worm reduction motor. The output end of the driving member is fixedly connected to the end of the rotating rod outside the left valve body to drive the rotating rod.

[0021] Preferably, a flow guide cover is arranged within the liquid outlet. The flow guide cover is sleeved on the outside of the end of the valve stem within the liquid outlet and is arranged in cooperation with the secondary valve port. The flow guide cover is slidably connected to the inner side wall of the liquid outlet, and one end of the flow guide cover is detachably connected to the piston by a bolt. The flow guide cover is provided with a number of liquid passing holes.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] By providing a secondary valve port and a main valve port, the present invention realizes two-stage regulation of the pressure regulating valve. Compared with the traditional piston-type pressure regulating valve, the present invention first opens the secondary valve port to reduce the pressure difference between the inner cavity and the liquid outlet, and then drives the piston to open the second inlet and the main valve port, reducing the torque during the start-up of the pressure regulating valve. Thus, the problem that the current piston-type pressure regulating valve has a large torque during start-up and cannot timely adjust the changes in fluid flow rate and pressure is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a two-stage low-torque flow and pressure regulating valve described in an embodiment of the present invention;

[0025] Figure 2 is a partial exploded structural diagram of a two-stage low-torque flow and pressure regulating valve described in an embodiment of the present invention;

[0026] Figure 3 is a partial sectional structural schematic of a two-stage low-torque flow and pressure regulating valve described in an embodiment of the present invention Figure 1 ;

[0027] Figure 4 is described in an embodiment of the present invention Figure 3 a partial enlarged structural diagram at A in;

[0028] Figure 5 is a partial sectional structural schematic of a two-stage low-torque flow and pressure regulating valve described in an embodiment of the present invention Figure 2 ;

[0029] Figure 6 is described in an embodiment of the present invention Figure 5 a partial enlarged structural diagram at A in;

[0030] Figure 7 is described in an embodiment of the present invention Figure 6 a partial enlarged structural diagram at A in;

[0031] Figure 8 is a schematic structural diagram of the left valve body described in an embodiment of the present invention;

[0032] Figure 9 is a partial exploded structural diagram of the right valve body described in an embodiment of the present invention;

[0033] Figure 10 is a partial exploded structural schematic of the piston described in an embodiment of the present invention Figure 1 ;

[0034] Figure 11 is described in an embodiment of the present invention Figure 10Schematic diagram of the partial enlarged structure at A in the [device / component name];

[0035] Figure 12 It is a schematic diagram of the partial exploded structure of the piston described in the embodiment of the present invention; Figure 2 ;

[0036] Description of reference numerals:

[0037] 10 - Flow - regulating and pressure - regulating valve body, 100 - Liquid inlet, 101 - Liquid outlet, 102 - Left valve body, 103 - Right valve body, 104 - First connection flange, 105 - Second connection flange, 106 - Insertion ring, 107 - Flow - guiding cover, 108 - Liquid passing hole, 109 - Sealing gasket, 110 - Support foot, 111 - Pressure - relief hole, 112 - Sealing bolt, 113 - Discharge port, 114 - Cover plate, 20 - Partition part, 200 - Outer cavity, 201 - Inner cavity, 202 - First inlet, 203 - Second inlet, 204 - Main valve port, 205 - Flow - guiding shell, 206 - Flow - guiding cylinder, 207 - Connection plate, 30 - Piston, 300 - Sub - valve port, 301 - Main sealing ring, 302 - Annular metal blade, 40 - Valve stem, 400 - Sealing member, 401 - Impact part, 402 - Fixed disk, 403 - Insertion rod, 404 - Contact ring, 405 - Locking nut, 406 - First installation part, 407 - Second installation part, 408 - Insertion section, 409 - Connection section, 410 - Sealing ring, 411 - Fixed bolt, 412 - Fixed sleeve, 413 - Locking head, 414 - Notch, 415 - Hexagonal socket; Detailed description of the specific implementation mode

[0038] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Embodiment:

[0040] As Figures 1 to 4 、 Figure 6 shown, this embodiment discloses a two - stage low - torque flow - regulating and pressure - regulating valve, including:

[0041] A flow - regulating and pressure - regulating valve body 10, with a liquid inlet 100 and a liquid outlet 101 respectively provided at both ends of the flow - regulating and pressure - regulating valve body 10, and a through - cavity is provided inside the flow - regulating and pressure - regulating valve body 10;

[0042] The separating part 20 is arranged in the through cavity. The separating part 20 divides the through cavity into an outer cavity 200 between the separating part 20 and the inner side wall of the flow regulating and pressure regulating valve body 10, and an inner cavity 201 inside the separating part 20. One end of the outer cavity 200 is communicated with the liquid inlet 100, and one end of the inner cavity 201 is communicated with the liquid outlet 101. On the side of the separating part 20 close to the liquid outlet 101, a first inlet 202 and a second inlet 203 are successively arranged. The first inlet 202 and the second inlet 203 are used to communicate the outer cavity 200 and the inner cavity 201. The second inlet 203 is located at one end of the separating part 20 close to the liquid outlet 101. A main valve port 204 is arranged between the inner cavity 201 and the liquid outlet 101;

[0043] The piston 30 is slidably arranged in the inner cavity 201. The piston 30 is used to control the opening or closing of the second inlet 203 and the main valve port 204. A secondary valve port 300 penetrating through the piston 30 is arranged on the piston 30. The secondary valve port 300 is used to communicate the inner cavity 201 and the liquid outlet 101;

[0044] The valve rod 40 is arranged in the inner cavity 201. One end of the valve rod 40 penetrates through the piston 30 and extends into the liquid outlet 101. The valve rod 40 is slidably connected with the piston 30. A sealing member 400 is arranged at one end of the valve rod 40 located in the inner cavity 201. The sealing member 400 can move with the valve rod 40 to contact the piston 30, and is used to control the opening or closing of the secondary valve port 300. At the same time, the sealing member 400 is also used to drive the piston 30 to close the second inlet 203 and the main valve port 204. An impact portion 401 is arranged at one end of the valve rod 40 located in the liquid outlet 101. The impact portion 401 can move with the valve rod 40 to contact the piston 30, and is used to drive the piston 30 to open the second inlet 203 and the main valve port 204;

[0045] The crank connecting rod driving assembly 50 is arranged in the inner cavity 201 and is cooperatively arranged with the valve rod 40 for driving the valve rod 40 to reciprocate.

[0046] By arranging the secondary valve port 300 and the main valve port 204, the present invention realizes two-stage regulation of the pressure regulating valve. Compared with the traditional piston 30 type pressure regulating valve, the present invention first opens the secondary valve port 300 to reduce the pressure difference between the inner cavity 201 and the liquid outlet 101, and then drives the piston 30 to open the second inlet 203 and the main valve port 204, reducing the torque during the start of the pressure regulating valve, thereby solving the problem that the current piston 30 type pressure regulating valve has a large torque during start and cannot timely adjust the changes in fluid flow rate and pressure.

[0047] Such as Figure 2 、 Figure 8As shown in the figure, in order to facilitate the disassembly, assembly and maintenance of the whole flow regulating and pressure regulating valve of the present invention, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that the flow regulating and pressure regulating valve body 10 includes a left valve body 102 and a right valve body 103. The liquid inlet 100 is arranged on the left valve body 102, and the liquid outlet 101 is arranged on the right valve body 103. A first connecting flange 104 is fixedly arranged on the left valve body 102, and a second connecting flange 105 is fixedly arranged on the right valve body 103. The first connecting flange 104 and the second connecting flange 105 are detachably connected by a plurality of bolts. A plugging ring 106 is arranged on the left valve body 102. The plugging ring 106 is fixedly connected with the left valve body 102. The plugging ring 106 can be inserted into the right valve body 103 and is slidably connected with the right valve body 103.

[0048] By setting the flow regulating and pressure regulating valve body 10 as a split structure detachably connected through the first connecting flange 104 and the second connecting flange 105, it is convenient for the disassembly, assembly and maintenance of the whole flow regulating and pressure regulating valve. As Figure 8 shown, as a further preference, a sealing gasket 109 is arranged between the first connecting flange 104 and the second connecting flange 105. The sealing gasket 109 is embedded and installed on the first connecting flange 104 to increase the sealing performance between the first connecting flange 104 and the second connecting flange 105. In another embodiment, the sealing gasket 109 can also be embedded and installed on the second connecting flange 105. Among them, the setting of the plugging ring 106 can not only play a guiding role when the left valve body 102 and the right valve body 103 are connected, but also further increase the sealing performance between the left valve body 102 and the right valve body 103. During use, through the sealing gasket 109 and the plugging ring 106, the sealing performance of the connection between the left valve body 102 and the right valve body 103 is realized, so that the liquid medium in the outer cavity 200 is not easily leaked from the connection between the left valve body 102 and the right valve body 103.

[0049] As Figure 5As shown in the figure, in order to facilitate the diversion of the liquid medium in the outer cavity 200, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that the partition part 20 includes a diversion shell 205 and a diversion cylinder 206. The diversion shell 205 is arranged in the left valve body 102 and is connected to the inner side wall of the left valve body 102 through a plurality of connecting plates 207. One ends of the plurality of connecting plates 207 are fixedly connected to the inner side wall of the left valve body 102, and the other ends are fixedly connected to the outer side wall of the diversion shell 205. The diversion cylinder 206 is arranged in the right valve body 103. One end of the diversion cylinder 206 is fixedly connected to one end of the right valve body 103 close to the liquid outlet 101, and the other end can be inserted into the diversion shell 205 and is detachably connected to the diversion shell 205. The first inlet 202 and the second inlet 203 are respectively arranged at both ends of the diversion cylinder 206, and the second inlet 203 is located at one end of the diversion cylinder 206 close to the liquid outlet 101. A part of the inner cavity 201 is located in the diversion cylinder 206, and the other part is located in the diversion shell 205. The valve rod 40 is arranged in the inner cavity 201 located in the diversion cylinder 206.

[0050] The partition part 20 is set to the structure of the diversion shell 205 and the diversion cylinder 206, and at the same time, the diversion cylinder 206 and the diversion shell 205 are detachably connected, which can facilitate the installation or disassembly of the partition part 20. As a further preference, one end of the diversion shell 205 close to the liquid inlet 100 is arc-shaped. When the liquid medium enters from the liquid inlet 100, the arc-shaped end of the diversion shell 205 can effectively divert the liquid medium into the outer cavity 200. At the same time, the first inlet 202 and the second inlet 203 are arranged at both ends of the diversion cylinder 206, which can facilitate the connection between the inner cavity 201 and the outer cavity 200.

[0051] As a further preference, the first inlet 202 and the second inlet 203 can be several. The several first inlets 202 are distributed in a circular array on one end of the diversion cylinder 206, and the several second inlets 203 are distributed in a circular array on the other end of the diversion cylinder 206. The first inlet 202 and the second inlet 203 can be set as round holes, grid strip holes, various special-shaped holes, etc. to obtain different adjustment curves.

[0052] As Figure 3 、 Figure 10 shown, in order to facilitate the piston 30 to control the opening or closing of the second inlet 203 and the main valve port 204, the piston 30 is arranged in the inner cavity 201 located in the diversion cylinder 206 and is slidably connected to the inner side wall of the diversion cylinder 206. One end of the piston 30 close to the liquid outlet 101 can contact the inner side wall of the right valve body 103. A main sealing ring 301 is arranged on the end of the piston 30 contacting the inner side wall of the right valve body 103. The main sealing ring 301 is embedded and installed on the piston 30. The main sealing ring 301 can contact the inner side wall of the right valve body 103 and is used to control the opening or closing of the main valve port 204.

[0053] When the piston 30 slides to the rightmost end of the flow guide cylinder 206, one end of the piston 30 provided with the main sealing ring 301 can contact the inner side wall of the right valve body 103, so as to contact the inner side wall of the right valve body 103 through the main sealing ring 301, and the main valve port 204 is closed; when the piston 30 slides to the left, the main valve port 204 and the second inlet 203 are gradually opened, so that the liquid medium in the outer cavity 200 can directly enter the liquid outlet 101 through the second inlet 203 and the main valve port 204.

[0054] Since there may be impurities in the liquid medium, when the impurities pass through the first inlet 202 or the second inlet 203, they are likely to get stuck at the first inlet 202 and the second inlet 203, thus affecting the reciprocating movement of the piston 30. In order to facilitate the smooth reciprocating movement of the piston 30, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that annular metal blades 302 are provided on the outer sides of both ends of the piston 30, and the annular metal blades 302 are fixedly connected to the piston 30. When the piston 30 reciprocates, the annular metal blade 302 at one end of the piston 30 close to the liquid outlet 101 can cut the impurities stuck at the second inlet 203, and the annular metal blade 302 at the other end can cut the impurities stuck at the first inlet 202.

[0055] By providing the annular metal blades 302 on the piston 30, it is convenient to cut the impurities at the first inlet 202 and the second inlet 203, so as to facilitate the smooth reciprocating movement of the piston 30 and prevent jamming.

[0056] In order to facilitate the opening or closing of the auxiliary valve port 300, in one embodiment, the closing member 400 includes a fixed disk 402 and an auxiliary sealing ring. The fixed disk 402 is fixedly arranged at one end of the valve stem 40 located inside the flow guide cylinder 206, and the auxiliary sealing ring is fixedly arranged on the fixed disk 402. The auxiliary sealing ring can contact the auxiliary valve port 300 and is used to control the opening or closing of the auxiliary valve port 300.

[0057] During use, the auxiliary sealing ring can contact the auxiliary valve port 300 and cover the auxiliary valve port 300, and is used to control the opening or closing of the auxiliary valve port 300.

[0058] As Figure 10 shown, in another embodiment, the closing member 400 includes a fixed disk 402 and an insertion rod 403 arranged in cooperation with the auxiliary valve port 300. The fixed disk 402 is fixedly arranged at one end of the valve stem 40 located inside the flow guide cylinder 206. One end of the insertion rod 403 is fixedly arranged on the fixed disk 402, and the other end can be inserted into the auxiliary valve port 300 to close the auxiliary valve port 300.

[0059] As Figure 10 、 Figure 11As shown in the figure, the insertion rod 403 includes a plugging section 408 and a connecting section 409. One end of the connecting section 409 is fixedly connected to the fixed disk 402, and one end of the plugging section 408 is fixedly connected to the other end of the connecting section 409. A sealing ring 410 is arranged in the secondary valve port 300 and is arranged in cooperation with the insertion rod 403. When the insertion rod 403 is inserted into the secondary valve port 300, the plugging section 408 passes through the sealing ring 410, and the connecting section 409 contacts the sealing ring 410 to form a seal.

[0060] As Figure 7 , Figure 10 shown in the figure, the sealing ring 410 is slidably connected to the inner side wall of the secondary valve port 300. A fixing bolt 411 for fixing the sealing ring 410 is arranged in the secondary valve port 300. The fixing bolt 411 includes a fixing sleeve 412 and a locking head 413. One end of the fixing sleeve 412 is fixedly connected to the locking head 413, and the other end can contact the sealing ring 410. A notch 414 arranged in cooperation with the plugging section 408 is provided at the end of the fixing sleeve 412 that contacts the sealing ring 410. The plugging section 408 can be inserted into the notch 414. The outer side of the locking head 413 is detachably connected to the inner side wall of the secondary valve port 300 through a thread. An internal hexagonal groove 415 penetrating the locking head 413 is provided on the locking head 413. The notch 414 penetrates the fixing sleeve 412 and is communicated with the internal hexagonal groove 415.

[0061] During use, when the fixed disk 402 contacts the piston 30, the insertion rod 403 is inserted into the secondary valve port 300. The plugging section 408 of the insertion rod 403 passes through the sealing ring 410, and the connecting section 409 of the insertion rod 403 contacts the sealing ring 410 to form a seal. As a further preference, the plugging section 408 of the insertion rod 403 is in clearance fit with the secondary valve port 300. When the insertion rod 403 starts to withdraw from the secondary valve port 300, the connecting section 409 of the insertion rod 403 withdraws from the secondary valve port 300 first. At this time, the plugging section 408 of the insertion rod 403 is located in the secondary valve port 300. Since the plugging section 408 of the insertion rod 403 is in clearance fit with the secondary valve port 300, the secondary valve port 300 is already in a partially open state at this time. When the insertion rod 403 continues to withdraw from the secondary valve port 300, the plugging section 408 of the insertion rod 403 withdraws from the secondary valve port 300, so that the secondary valve port 300 is completely opened. The setting of the internal hexagonal groove 415 facilitates the disassembly and assembly of the sealing ring 410 and the fixing bolt 411. The liquid medium entering the secondary valve port 300 can flow in the secondary valve port 300 through the sealing ring 410, the notch 414 and the internal hexagonal groove 415.

[0062] As Figure 10As shown, in order to facilitate the reciprocating movement of the piston 30, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that the impact portion 401 includes a contact ring 404 and a locking nut 405. One end of the valve stem 40 located inside the liquid outlet 101 is provided with a first mounting portion 406. The locking nut 405 is arranged on the first mounting portion 406 and is detachably connected to the first mounting portion 406 by a thread. A second mounting portion 407 is provided between the first mounting portion 406 and the valve stem 40. The contact ring 404 is arranged on the second mounting portion 407. The locking nut 405 is used to fix the contact ring 404 on the second mounting portion 407.

[0063] As Figure 6 shown, there is an idle stroke H between the impact portion 401 and the piston 30. The idle stroke H is the length of the valve stem 40 between the impact portion 401 and the piston 30 in the fully closed state of the valve.

[0064] When starting to adjust the pressure and flow rate, in the fully closed state of the valve, when the valve stem 40 slides leftward under the drive of the crank connecting rod drive assembly 50 and the sliding distance is less than the idle stroke H, at this time the impact portion 401 does not contact the piston 30. During this process, only the gradual opening of the sub-valve port 300 is controlled. When the sliding distance of the valve stem 40 leftward is equal to the idle stroke H, at this time the sub-valve port 300 is fully opened, and at the same time the contact ring 404 in the impact portion 401 contacts the piston 30. At this time, when the valve stem 40 continues to slide leftward, it can drive the piston 30 to slide leftward, realizing the gradual opening of the second inlet 203 and the main valve port 204.

[0065] At the same time, through the idle stroke H, the impact portion 401 can generate an inertial impact on the piston 30, so that the reciprocating movement of the piston 30 is not easily jammed.

[0066] As Figure 1 、 Figure 12As shown in the figure, in order to facilitate the driving of the valve stem 40, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that the crank and connecting rod driving assembly 50 includes a first connecting seat 500, a second connecting seat 501, a connecting rod 502, a rotating rod 503 and a driving member 504. The rotating rod 503 is arranged in the diversion shell 205. One end of the rotating rod 503 is rotatably connected to the inner side wall of the diversion shell 205, and the other end penetrates through the diversion shell 205 and the left valve body 102 and extends outside the left valve body 102. The rotating rod 503 is respectively rotatably connected to the diversion shell 205 and the left valve body 102. The first connecting seat 500 is arranged in the diversion shell 205 and is fixedly connected to one end of the rotating rod 503. The second connecting seat 501 is fixedly arranged at the end of the valve stem 40 located inside the diversion cylinder 206. Both ends of the connecting rod 502 are respectively rotatably connected to the first connecting seat 500 and the second connecting seat 501. The driving member 504 is arranged outside the flow regulating and pressure regulating valve body 10 and is cooperatively arranged with the end of the rotating rod 503 located outside the left valve body 102 for driving the rotating rod 503.

[0067] The driving member 504 is a worm and gear reduction motor. The output end of the driving member 504 is fixedly connected to the end of the rotating rod 503 located outside the left valve body 102 for driving the rotating rod 503. The driving member 504 can adopt a worm and gear reduction motor in the prior art that can realize the functions of the present invention.

[0068] The driving member 504 can also adopt a handwheel, a hydraulic transmission device, a pneumatic device, an electric device, a gas-liquid linkage device, an electro-hydraulic linkage device, etc. in the prior art, which are driving devices that can realize the functions of the driving member 504 of the present invention.

[0069] As a further preference, pressure sensing members are provided in the outer cavity 200, the inner cavity 201 and the liquid outlet 101, and the pressure sensing members are used for sensing pressure.

[0070] The pressure sensing members can adopt pressure sensors or pressure gauges in the prior art, so as to facilitate the control of the start or close of the valve according to the pressure.

[0071] As Figure 9 shown in the figure, in order to facilitate the diversion, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that a diversion cover 107 is provided in the liquid outlet 101. The diversion cover 107 is sleeved on the outside of the end of the valve stem 40 located at the liquid outlet 101 and is cooperatively arranged with the auxiliary valve port 300. The diversion cover 107 is slidably connected to the inner side wall of the liquid outlet 101, and one end of the diversion cover 107 is detachably connected to the piston 30 by bolts. A number of liquid passing holes 108 are provided on the diversion cover 107.

[0072] As a further preference, the outer side surface of the diversion cover 107 is an inclined surface (as Figure 3the outer side surface of the fairing 107 shown in the figure) or a parabolic surface (such as Figure 5 the outer side surface of the fairing 107 shown in the figure), the liquid passing through the hole 108 can be set as a round hole, a grid bar hole, various special-shaped holes, etc.

[0073] When in use, the setting of the fairing 107 can facilitate the guiding of the liquid medium, thereby avoiding the liquid medium entering from the main valve port 204 from flushing against the center to generate noise, erosion and turbulence. At the same time, the liquid passing through hole 108 on the fairing 107 can achieve a certain throttling effect.

[0074] As a further preference, in order to facilitate the exchange of the directions of the liquid inlet 100 and the liquid outlet 101 when installing the flow regulating and pressure regulating valve of the present invention, four support feet 110 are provided on both the top and bottom of the flow regulating and pressure regulating valve body 10. Threaded holes are provided on the four support feet 110, and the threaded holes can be externally connected with lifting rings.

[0075] such as Figure 8 shown, as a further preference, pressure relief holes 111 communicating with the outer cavity 200 are provided on both the top and bottom of the flow regulating and pressure regulating valve body 10. A sealing bolt 112 is provided at the pressure relief hole 111, and the sealing bolt 112 is threadedly connected to the pressure relief hole 111. The setting of the pressure relief hole 111 can facilitate emergency pressure relief. At the same time, the threaded connection between the sealing bolt 112 and the pressure relief hole 111 can facilitate the rapid opening of the pressure relief hole 111.

[0076] Among them, the pressure relief hole 111 is provided on the left valve body 102.

[0077] such as Figure 9 shown, as a further preference, a plurality of discharge ports 113 communicating with the outer cavity 200 are provided on the right valve body 103. The plurality of discharge ports 113 are arranged at one end of the right valve body 103 close to the liquid outlet 101. The plurality of discharge ports 113 are used to discharge the remaining medium in the outer cavity 200. A cover plate 114 is provided at the plurality of discharge ports 113, and the cover plate 114 is detachably connected to the discharge ports 113 by bolts for closing the discharge ports 113.

[0078] The working principle of the present invention:

[0079] When flow and pressure regulation are required in the present invention, it should start from the fully closed state. At this time, the liquid medium enters the outer cavity 200 from the liquid inlet 100, and then enters the inner cavity 201 through the first inlet 202. Then, the crank and connecting rod drive assembly 50 drives the valve stem 40 to move, thereby driving the sealing member 400 to move, so as to gradually open the secondary valve port 300. At this time, the liquid medium starts to enter the liquid outlet 101 from the inner cavity 201 through the secondary valve port 300, and the pressure difference between the inner cavity 201 and the liquid outlet 101 starts to decrease. Since the impact portion 401 has not yet contacted the piston 30, and at the same time the pressure in the inner cavity 201 is greater than the pressure at the liquid outlet 101, the piston 30 does not move at this time, and the second inlet 203 and the main valve port 204 are in the closed state. When the valve stem 40 moves until the impact portion 401 contacts the piston 30, the secondary valve port 300 is fully opened at this time, and the pressure difference between the inner cavity 201 and the liquid outlet 101 reaches the minimum. Then, the valve stem 40 is driven to continue to move through the crank and connecting rod drive assembly 50, so that the impact portion 401 drives the piston 30, and the second inlet 203 and the main valve port 204 are gradually opened. At this time, most of the liquid medium can enter the liquid outlet 101 from the second inlet 203 and the main valve port 204, and a small part of the liquid medium enters the inner cavity 201 from the first inlet 202, and then enters the liquid outlet 101 through the secondary valve port 300. Thus, the flow and pressure regulation process is completed. When closing, only need to drive the valve stem 40 to move in the reverse direction through the crank and connecting rod drive assembly 50, so that the sealing member 400 contacts the piston 30, then the secondary valve port 300 can be closed. Then continue to drive the valve stem 40 to move in the reverse direction through the crank and connecting rod drive assembly 50, and the piston 30 can close the second inlet 203 and the main valve port 204. Thus, the valve closing process is completed.

[0080] The above embodiments only represent the specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A two-stage low-torque flow and pressure regulating valve, characterized in that, Comprising: A flow - regulating and pressure - regulating valve body (10), with a liquid inlet (100) and a liquid outlet (101) respectively provided at both ends of the flow - regulating and pressure - regulating valve body (10), and a through - cavity is provided inside the flow - regulating and pressure - regulating valve body (10); A partition part (20), which is arranged in the through - cavity. The partition part (20) divides the through - cavity into an outer cavity (200) and an inner cavity (201). One end of the outer cavity (200) is communicated with the liquid inlet (100), and one end of the inner cavity (201) is communicated with the liquid outlet (101). A first inlet (202) and a second inlet (203) are successively arranged on the side of the partition part (20) close to the liquid outlet (101). A main valve port (204) is arranged between the inner cavity (201) and the liquid outlet (101); A piston (30), which is slidably arranged in the inner cavity (201). The piston (30) is used to control the opening or closing of the second inlet (203) and the main valve port (204). A secondary valve port (300) penetrating through the piston (30) is provided on the piston (30), and the secondary valve port (300) is used to communicate the inner cavity (201) and the liquid outlet (101); A valve rod (40), which is arranged in the inner cavity (201). One end of the valve rod (40) penetrates through the piston (30) and extends into the liquid outlet (101). The valve rod (40) is slidably connected with the piston (30). A sealing member (400) is provided at one end of the valve rod (40) located in the inner cavity (201). The sealing member (400) is used to control the opening or closing of the secondary valve port (300), and at the same time, the sealing member (400) is also used to drive the piston (30) to close the second inlet (203) and the main valve port (204). An impact part (401) is provided at one end of the valve rod (40) located in the liquid outlet (101), and the impact part (401) is used to drive the piston (30) to open the second inlet (203) and the main valve port (204); A crank - connecting rod drive assembly (50), which is arranged in the inner cavity (201) and is cooperatively arranged with the valve rod (40) for driving the valve rod (40) to reciprocate.

2. The two-stage low-torque flow and pressure regulating valve according to claim 1, characterized in that, The flow - regulating and pressure - regulating valve body (10) includes a left valve body (102) and a right valve body (103). The liquid inlet (100) is arranged on the left valve body (102), and the liquid outlet (101) is arranged on the right valve body (103). A first connection flange (104) is fixedly provided on the left valve body (102), and a second connection flange (105) is fixedly provided on the right valve body (103). The first connection flange (104) and the second connection flange (105) are detachably connected by a plurality of bolts. A plug - in ring (106) is provided on the left valve body (102). The plug - in ring (106) is fixedly connected with the left valve body (102), and the plug - in ring (106) can be inserted into the right valve body (103) and is slidably connected with the right valve body (103).

3. The two-stage low-torque flow and pressure regulating valve according to claim 2, wherein, The partition part (20) includes a diversion housing (205) and a diversion cylinder (206). The diversion housing (205) is arranged inside the left valve body (102) and is connected to the inner side wall of the left valve body (102) through a plurality of connecting plates (207). One ends of the plurality of connecting plates (207) are fixedly connected to the inner side wall of the left valve body (102), and the other ends are fixedly connected to the outer side wall of the diversion housing (205). The diversion cylinder (206) is arranged inside the right valve body (103). One end of the diversion cylinder (206) is fixedly connected to one end of the right valve body (103) close to the liquid outlet (101), and the other end can be inserted into the diversion housing (205) and is detachably connected to the diversion housing (205). The first inlet (202) and the second inlet (203) are respectively arranged at both ends of the diversion cylinder (206), and the second inlet (203) is located at one end of the diversion cylinder (206) close to the liquid outlet (101). A part of the inner cavity (201) is located inside the diversion cylinder (206), and another part is located inside the diversion housing (205). The valve stem (40) is arranged inside the inner cavity (201) located inside the diversion cylinder (206).

4. A two-stage low-torque flow and pressure regulating valve according to claim 3, characterized in that, The piston (30) is arranged inside the inner cavity (201) located inside the diversion cylinder (206) and is slidably connected to the inner side wall of the diversion cylinder (206). One end of the piston (30) close to the liquid outlet (101) can contact the inner side wall of the right valve body (103). A main sealing ring (301) is arranged on the end of the piston (30) contacting the inner side wall of the right valve body (103). The main sealing ring (301) is embedded and installed on the piston (30) and can contact the inner side wall of the right valve body (103) to control the opening or closing of the main valve port (204).

5. A two-stage low-torque flow and pressure regulating valve according to claim 4, characterized in that, Circular metal blades (302) are arranged on the outer sides of both ends of the piston (30). The circular metal blades (302) are fixedly connected to the piston (30). When the piston (30) reciprocates, the circular metal blade (302) at the end of the piston (30) close to the liquid outlet (101) can cut the impurities stuck at the second inlet (203), and the circular metal blade (302) at the other end can cut the impurities stuck at the first inlet (202).

6. A two-stage low-torque flow and pressure regulating valve according to claim 5, characterized in that, The closing member (400) includes a fixed disk (402) and an insertion rod (403) arranged in cooperation with the secondary valve port (300). The fixed disk (402) is fixedly arranged at one end of the valve stem (40) located inside the diversion cylinder (206). One end of the insertion rod (403) is fixedly arranged on the fixed disk (402), and the other end can be inserted into the secondary valve port (300) to close the secondary valve port (300).

7. A two-stage low-torque flow and pressure regulating valve according to claim 6, characterized in that, The impact part (401) includes a contact ring (404) and a locking nut (405). One end of the valve stem (40) located inside the liquid outlet (101) is provided with a first mounting part (406). The locking nut (405) is arranged on the first mounting part (406) and is detachably connected to the first mounting part (406) by a thread. A second mounting part (407) is arranged between the first mounting part (406) and the valve stem (40). The contact ring (404) is arranged on the second mounting part (407). The locking nut (405) is used to fix the contact ring (404) on the second mounting part (407).

8. A two-stage low-torque flow and pressure regulating valve according to claim 7, characterized in that The crank connecting rod drive assembly (50) includes a first connecting seat (500), a second connecting seat (501), a connecting rod (502), a rotating rod (503) and a driving part (504). The rotating rod (503) is arranged inside the diversion shell (205). One end of the rotating rod (503) is rotatably connected to the inner side wall of the diversion shell (205), and the other end penetrates through the diversion shell (205) and the left valve body (102) and extends outside the left valve body (102). The rotating rod (503) is respectively rotatably connected to the diversion shell (205) and the left valve body (102). The first connecting seat (500) is arranged inside the diversion shell (205) and is fixedly connected to one end of the rotating rod (503). The second connecting seat (501) is fixedly arranged at one end of the valve stem (40) located inside the diversion cylinder (206). Two ends of the connecting rod (502) are respectively rotatably connected to the first connecting seat (500) and the second connecting seat (501). The driving part (504) is arranged outside the flow regulating and pressure regulating valve body (10) and is arranged in cooperation with one end of the rotating rod (503) located outside the left valve body (102) for driving the rotating rod (503).

9. A two-stage low-torque flow and pressure regulating valve according to claim 8, characterized in that, The driving part (504) is a worm and gear reduction motor. The output end of the driving part (504) is fixedly connected to one end of the rotating rod (503) located outside the left valve body (102) for driving the rotating rod (503).

10. A two-stage low-torque flow and pressure regulating valve according to claim 9, characterized in that, A diversion cover (107) is arranged inside the liquid outlet (101). The diversion cover (107) is sleeved on the outside of one end of the valve stem (40) located at the liquid outlet (101) and is arranged in cooperation with the auxiliary valve port (300). The diversion cover (107) is slidably connected to the inner side wall of the liquid outlet (101), and one end of the diversion cover (107) is detachably connected to the piston (30) by a bolt. A plurality of liquid passing holes (108) are arranged on the diversion cover (107).

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