Switching valve with pressure pre-balancing function and pressure coupling device

Abstract

The invention belongs to flow industry pressure coupling devices, and discloses a switching valve with a pressure pre-balancing function and a pressure coupling device.The switching valve comprises a valve body with a plurality of connecting ports, the valve body is provided with a driving end valve component, and the driving end valve component comprises a driving end valve deck, a driving rod, a driving end valve plate, a driving end valve seat and a nut; a basic unit of the pressure coupling device is at least two single-cylinder devices arranged side by side, and each single-cylinder device is mainly composed of a driving end module, a response end module and a pressure exchange cylinder connected between the driving end module and the response end module. Wherein the driving end module comprises a four-way switching valve and a three-way switching valve which are provided with driving end valve components, and the response end module comprises a four-way check valve and a three-way check valve which are provided with response end valve components. The device has the characteristics of simple pressure pre-balancing structure, low driving energy consumption, good pressure difference self-tightening sealing effect, compact overall structure, convenience in installation and maintenance and the like.

Description

Technical Field

[0001] The present invention belongs to a process industry pressure coupling device, and in particular, relates to a device for realizing pressure exchange between two fluids with different pressures through direct contact. Background Art

[0002] With the continuous increase in the depth of coal mining in my country, the problem of heat damage in mines has become increasingly prominent. The ground centralized cooling system has the advantages of simple equipment and high refrigeration efficiency, and is widely used to solve the problem of heat damage in deep mines. The system transports the cold water produced in the ground refrigeration station to the underground. Due to the height difference, the static pressure of the cold water increases, and the high-pressure cold water needs to be depressurized and then transported to the air cooler units at various cooling points at the end for use; while the hot water needs to be transported back to the ground and refrigerated by the refrigeration station for recycling. This process involves the pressure exchange of high and low pressure fluids, which can be completed through a pressure coupling device, that is, two streams of cold and hot water fluids with different pressures are pressure-transmitted through direct contact, thereby achieving the reduction of high-pressure cold water and the increase of low-pressure hot water.

[0003] The pressure coupling device used in the centralized cooling system of the ground of the mine is generally a valve-controlled device, which realizes the pressure exchange of high and low pressure fluids through the orderly switching of the driving end valve and the response end valve. Patent application 201210106510.8 discloses a high and low pressure water energy exchange system for mines with adjustable pressure. The core component of its three-chamber water energy exchange device is a hydraulic valve. The valve core adopts a streamlined structure to reduce the flow resistance of the valve, but there are the following shortcomings: when the hydraulic valve is kept in a closed state, the huge pressure difference on both sides of the valve plate is a resistance, and the hydraulic drive mechanism needs to continuously provide a large driving force, which increases the energy consumption of the system. Moreover, the effect of this forced sealing is poor, which is easy to cause leakage and high and low pressure cross-flow, and also reduces the operation stability of the device; in the process of switching the hydraulic valve, an additional pressure pre-balancing valve group structure is required to switch first, and the main valve is switched after the pressure difference on both sides of the valve plate is balanced. This set of auxiliary valve groups increases the complexity of the overall structure of the device. Summary of the invention

[0004] The present invention aims to solve the problems of high driving energy consumption and complex pressure pre-balancing auxiliary structure of the pressure coupling device. A switching valve with pressure pre-balancing function and a corresponding pressure coupling device are designed. The switching valve has the characteristics of simple pressure pre-balancing structure, low driving energy consumption, good pressure difference self-tightening sealing effect, compact overall structure of the device, and easy installation and maintenance.

[0005] In order to achieve the above-mentioned object of the invention, the present invention is implemented by the following technical solutions:

[0006] According to one aspect of the present invention, a switching valve with a pressure pre-balancing function is provided, comprising a valve body with a plurality of connection ports, the valve body being installed with a driving end valve component; the driving end valve component comprising a driving end valve cover, a driving rod, a driving end valve plate, a driving end valve seat, and a nut; a connection port A of the valve body is used for installation and removal of the driving end valve component, a connection port B of the valve body is controlled to be opened and closed by the driving end valve component, and the connection port A and the connection port B are coaxially arranged relative to each other;

[0007] The driving end valve cover covers and is fixed to the connection port A of the valve body, and is provided with an axially penetrating through cavity along its central axis, and the through cavity is used to install the driving rod;

[0008] The driving rod comprises a first section and a second section, wherein the outer diameter of the second section is smaller than that of the first section; the end of the first section is used to connect an external driving mechanism, the first section can slide coaxially relative to the through cavity of the driving end valve cover, and a dynamic seal is arranged between the first section and the through cavity; a nut is installed at the end of the second section, and the nut is used to limit the driving end valve plate; the second section is provided with a non-through pressure pre-balancing cavity along its central axis, the pressure pre-balancing cavity is through at the end of the second section and is arranged as a blind end toward the first section; a plurality of radial pressure pre-balancing holes are opened at the blind end of the pressure pre-balancing cavity, and the pressure pre-balancing holes are connected with the pressure pre-balancing cavity;

[0009] The driving end valve plate is installed outside the second section of the driving rod, and includes a driving end sealing end plate and a driving end valve plate shaft, wherein the driving end valve plate shaft has a smaller outer diameter than the driving end sealing end plate; the driving end valve plate is provided with an axially penetrating through hole along its central axis, and the through hole is used to realize the coaxial sliding of the driving end valve plate relative to the second section of the driving rod; the surface of the driving end sealing end plate faces the connection port B of the valve body, and a sealing arc surface is provided at the edge of the surface of the driving end sealing end plate;

[0010] The driving end valve seat is fixedly installed at the necked part of the connection port B of the valve body and realizes static sealing at the connection; the driving end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the driving end valve seat cooperates with the sealing arc surface of the driving end valve plate to realize the linear sealing of the arc surface to the conical surface.

[0011] Furthermore, the valve body has at least three connection ports.

[0012] Furthermore, the necking portion of the connection port B of the valve body is configured to be arc-shaped.

[0013] Furthermore, the driving end valve cover includes a plate body portion and a columnar body portion from the outside to the inside, and the diameter of the columnar body portion is smaller than that of the plate body portion; the plate body portion can cover the connection port A of the valve body, and is connected to the connection port A of the valve body through a flange; the through cavity axially penetrates along the central axis of the plate body portion and the columnar body portion.

[0014] Furthermore, a driving rod sealing arc surface is provided at the step of the first section of the driving rod relative to the second section, and a sealing conical surface is provided at the end of the driving end valve plate shaft of the driving end valve plate; the driving rod sealing arc surface cooperates with the sealing conical surface of the driving end valve plate to realize linear sealing of the arc surface to the conical surface.

[0015] Furthermore, the pressure pre-balancing holes are evenly arranged along the circumferential direction of the driving rod.

[0016] According to another aspect of the present invention, there is provided a pressure coupling device with a pressure pre-balancing function, comprising at least two single-cylinder devices arranged side by side, the single-cylinder device comprising a driving end module, a response end module and a pressure exchange cylinder body, the pressure exchange cylinder body being arranged between the driving end module and the response end module;

[0017] The driving end module comprises a four-way switching valve and a three-way switching valve, and both the four-way switching valve and the three-way switching valve are provided with a driving end valve component;

[0018] The first port of the four-way switching valve is connected to the pressure exchange cylinder through a flange, the third port is connected to the three-way switching valve through a flange, the fourth port is used to connect to the low-pressure fluid outlet main pipe, and the second port is used for the installation and removal of the driving end valve component, and the driving end valve component can realize the opening and closing of the fourth port; wherein the second port and the fourth port of the four-way switching valve are coaxially arranged opposite to each other;

[0019] The first port of the three-way switching valve is connected to the four-way switching valve through a flange, the third port is used to connect the high-pressure fluid inlet main pipe, and the second port is used for installation and removal of the driving end valve component, and the driving end valve component can realize the opening and closing of the first port; wherein the first port and the second port of the three-way switching valve are coaxially arranged opposite to each other;

[0020] The driving end valve components include a driving end valve cover, a driving rod, a driving end valve plate, a driving end valve seat, and a nut;

[0021] The driving end valve cover covers and is fixed to the second port of the four-way switching valve and the second port of the three-way switching valve, and is provided with an axially penetrating through cavity along its central axis, and the through cavity is used to install the driving rod;

[0022] The driving rod comprises a first section and a second section, wherein the outer diameter of the second section is smaller than that of the first section; the end of the first section is used to connect an external driving mechanism, the first section can slide coaxially relative to the through cavity of the driving end valve cover, and a dynamic seal is arranged between the first section and the through cavity; a nut is installed at the end of the second section, and the nut is used to limit the driving end valve plate; the second section is provided with a non-through pressure pre-balancing cavity along its central axis, the pressure pre-balancing cavity is through at the end of the second section and is arranged as a blind end toward the first section; a plurality of radial pressure pre-balancing holes are opened at the blind end of the pressure pre-balancing cavity, and the pressure pre-balancing holes are connected with the pressure pre-balancing cavity;

[0023] The driving end valve plate is installed outside the second section of the driving rod, and includes a driving end sealing end plate and a driving end valve plate shaft, and the driving end valve plate shaft has a smaller outer diameter than the driving end sealing end plate; the driving end valve plate is provided with an axially penetrating through hole along its central axis, and the through hole is used to realize the coaxial sliding of the driving end valve plate relative to the second section of the driving rod; the surface of the driving end sealing end plate faces the fourth port of the four-way switching valve and the first port of the three-way switching valve, and a sealing arc surface is provided at the edge of the surface of the driving end sealing end plate;

[0024] The driving end valve seat is fixedly mounted at the necking portion of the fourth port of the four-way switching valve and the necking portion of the first port of the three-way switching valve, and static sealing is achieved at the connection; the driving end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the driving end valve seat cooperates with the sealing arc surface of the driving end valve plate to achieve linear sealing of the arc surface to the conical surface;

[0025] The response end module comprises a four-way check valve and a three-way check valve, and both the four-way check valve and the three-way check valve are provided with a response end valve component;

[0026] The first port of the four-way check valve is connected to the pressure exchange cylinder through a flange, the third port is connected to the three-way check valve through a flange, the fourth port is used to connect to the low-pressure fluid inlet main pipe, and the second port is used for the installation and removal of the response end valve component, and the response end valve component can realize the opening and closing of the fourth port; wherein the second port of the four-way check valve is coaxially arranged with the fourth port;

[0027] The first port of the three-way check valve is connected to the four-way check valve through a flange, the third port is used to connect to the high-pressure fluid outlet main pipe, and the second port is used for the installation and removal of the response end valve component, and the response end valve component can realize the opening and closing of the first port; wherein the first port and the second port of the three-way check valve are coaxially arranged opposite to each other;

[0028] The response end valve component includes a response end valve cover, a response end valve plate, a response end valve seat, and a spring;

[0029] The response end valve cover comprises a plate body and a column body, wherein the diameter of the column body is smaller than that of the plate body; the plate body of the response end valve cover covers and is fixed to the second port of the four-way check valve and the second port of the three-way check valve, and the column body of the response end valve cover is provided with a non-through cavity along its central axis at one end away from the plate body, and the non-through cavity is used to install the response end valve plate;

[0030] The response end valve plate comprises a response end sealing end plate and a response end valve plate shaft, the diameter of the response end valve plate shaft is smaller than that of the response end sealing end plate; the response end valve plate shaft is inserted into the non-through cavity of the response end valve cover, so that the response end valve plate can slide axially relative to the response end valve cover; the surface of the response end sealing end plate faces the fourth port of the four-way check valve and the first port of the three-way check valve, and a sealing arc surface is provided at the edge of the surface of the response end sealing end plate; the spring sleeve is on the columnar portion of the response end valve cover and the outer side of the valve plate shaft of the response end valve plate;

[0031] The response end valve seat is fixedly installed at the necked portion of the fourth port of the four-way check valve and the necked portion of the first port of the three-way check valve, and realizes static sealing at the connection; the response end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the response end valve seat cooperates with the sealing arc surface of the response end valve plate to realize the linear sealing of the arc surface to the conical surface.

[0032] Furthermore, the driving end valve cover includes a plate body and a columnar body from the outside to the inside, and the diameter of the columnar body is smaller than that of the plate body; the plate body can cover the second port of the four-way switching valve and the second port of the three-way switching valve, and is connected to the second port of the four-way switching valve and the second port of the three-way switching valve through a flange; the through cavity axially penetrates along the central axis of the plate body and the columnar body.

[0033] Furthermore, a driving rod sealing arc surface is provided at the step of the first section of the driving rod relative to the second section, and a sealing conical surface is provided at the end of the driving end valve plate shaft of the driving end valve plate; the driving rod sealing arc surface cooperates with the sealing conical surface of the driving end valve plate to realize linear sealing of the arc surface to the conical surface.

[0034] Furthermore, the pressure pre-balancing holes are evenly arranged along the circumferential direction of the driving rod.

[0035] Furthermore, a plurality of radial windows are formed at one end of the columnar portion of the response end valve cover close to the plate body portion, and the plurality of radial windows are communicated with the non-through cavity.

[0036] Furthermore, one end of the spring is limited by an outer shoulder of the column portion of the response end valve cover, and the other end is limited by the end surface of the response end valve plate toward the response end valve cover.

[0037] Furthermore, a spring limiting boss is arranged at the center of the sealing end plate at the response end, and the spring limiting boss is used to fix the spring.

[0038] Furthermore, the necking parts of the four-way switching valve, the three-way switching valve, the four-way check valve, and the three-way check valve are respectively arranged to be arc-shaped.

[0039] The beneficial effects of the present invention are:

[0040] (1) For the driving end module of the pressure coupling device, the valve is combined with the three-way and four-way structures to form a new three-way switching valve and a four-way switching valve, which simplifies the structure of the driving end module; the driving end valve components in the three-way switching valve and the four-way switching valve are installed through a detachable valve cover, which is convenient for later maintenance; and the use of wearing parts such as springs is avoided, which increases the maintenance-free time of the device.

[0041] (ii) For the driving end module of the pressure coupling device, a switching valve with a pressure pre-balancing function is designed, that is, through the special structure of the driving end valve plate and the driving rod, a small connection state of fluids with different pressures on both sides of the valve plate can be pre-realized before the driving end valve plate is opened, which has the effect of pressure pre-balancing, thereby reducing the driving force of the external driving mechanism and reducing the overall energy consumption of the device; the driving end valve plate and the driving end valve seat form a line sealing structure, when the driving end valve plate is kept closed, the pressure difference of the fluid on both sides is the sealing power, which has a good effect of pressure difference self-tightening sealing; further, forced line sealing is adopted at the pressure pre-balancing structure, which effectively avoids the problem of cross-flow and cross-pressure of high and low pressure fluids, and improves the safety and stability of the device.

[0042] (III) For the response end module of the pressure coupling device, a three-way check valve and a four-way check valve corresponding to the drive end structure are also constructed. The installation and disassembly of the valve cover are simpler, which is convenient for the installation and subsequent maintenance of the response end valve components, making the device structure more compact as a whole and reducing the footprint of the pressure coupling device.

[0043] (iv) The switching valve of the device is based on a single-cylinder design. Three, four or more cylinders can be arranged side by side according to working conditions and control strategies, which facilitates flexible array and expands the processing capacity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1A schematic diagram of the overall structure of a pressure coupling device provided in an embodiment of the present invention;

[0045] Figure 2 for Figure 1 A cross-sectional diagram of the middle drive end module;

[0046] Figure 3 for Figure 2 A cross-sectional diagram of a four-way switching valve;

[0047] Figure 4 for Figure 2 A cross-sectional diagram of a three-way switching valve;

[0048] Figure 5 It is a cross-sectional schematic diagram of a driving rod in a driving end valve component;

[0049] Figure 6 It is a cross-sectional schematic diagram of a driving end valve plate in a driving end valve component;

[0050] Figure 7 (a) a top view and (b) a cross-sectional schematic diagram of a driving end valve seat in a driving end valve component;

[0051] Figure 8 Schematic diagram of the typical coaxial position of the drive rod and the drive end valve plate; (a) sealed state, (b) small connection state, (c) fully open state;

[0052] Fig. 9 for Figure 1 A cross-sectional schematic diagram of the response end module;

[0053] Fig.10 for Fig. 9 A cross-sectional diagram of a medium four-way check valve;

[0054] Fig.11 for Fig. 9 A cross-sectional diagram of a medium three-way check valve;

[0055] Fig.12 (a) a three-dimensional schematic diagram and (b) a cross-sectional schematic diagram of a response end valve cover in a response end valve component;

[0056] Fig.13 It is a cross-sectional schematic diagram of the response end valve plate in the response end valve component.

[0057] In the above figure: 1: driving end module; 2: pressure exchange cylinder; 3: response end module;

[0058] 11: Driving end reducing flange; 12: Four-way switching valve; 13: Three-way switching valve; 14: High-pressure fluid inlet main pipe; 15: Low-pressure fluid outlet main pipe;

[0059] 16: driving end valve component; 161: driving end valve cover; 162: driving rod, 1621: first section, 1622: second section, 1623: pressure pre-balance chamber, 1624: pressure pre-balance hole, 1625: driving rod sealing arc surface; 163: driving end valve plate, 1631: driving end sealing end plate, 1632: driving end valve plate shaft, 1633: sealing arc surface, 1634: sealing cone surface; 164: driving end valve seat; 165: nut;

[0060] 31: Response end reducer flange; 32: Four-way check valve; 33: Three-way check valve; 34: High-pressure fluid outlet mother pipe; 35: Low-pressure fluid inlet mother pipe;

[0061] 36: response end valve component; 361: response end valve cover; 362: response end valve plate, 3621: response end sealing end plate, 3622: response end valve plate shaft; 363: response end valve seat; 364: spring. DETAILED DESCRIPTION

[0062] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0063] like Figure 1 As shown, the pressure coupling device with pressure pre-balancing function provided in this embodiment has a basic unit of a single cylinder device. Two or more basic units are arranged side by side to realize the normal pressure exchange process of the centralized cooling system on the ground of the mine ( Figure 1 The figure shows a parallel arrangement of three cylinder devices. For a single cylinder device, it is mainly composed of a driving end module 1, a response end module 3 and a pressure exchange cylinder 2 connected therebetween. The switching valve with a pressure pre-balancing function provided in this embodiment includes a four-way switching valve 12 and a three-way switching valve 13, but the switching valve defined in the present invention can also be a switching valve with more than four connection ports.

[0064] like Figure 2 As shown, the driving end module 1 includes a driving end reducing flange 11, a four-way switching valve 12, and a three-way switching valve 13, which are respectively connected to the pressure exchange cylinder 2, the low-pressure fluid outlet mother pipe 15, and the high-pressure fluid inlet mother pipe 14.

[0065] like Figure 3As shown, the four-way switching valve 12 includes a four-way valve body and a driving end valve component 16, wherein the four-way valve body includes four ports, namely, a first port, a second port, a third port, and a fourth port, wherein the first port is coaxially arranged with the third port, the second port is coaxially arranged with the fourth port, and the axial directions of the first port and the third port are perpendicular to the axial directions of the second port and the fourth port. The first port of the four-way switching valve 12 is connected to the pressure exchange cylinder 2 through the driving end reducer flange 11, the third port is directly connected to the three-way switching valve 13 through a flange, and the fourth port is connected to the low-pressure fluid outlet mother pipe 15 through a flange. The second port is used for the installation and disassembly of the driving end valve component 16, and the driving end valve component 16 can realize the opening and closing of the fourth port; when the fourth port is open, the fourth port is connected to the first port and the third port; when the fourth port is closed, only the first port is connected to the third port.

[0066] like Figure 4 As shown, the three-way switching valve 13 includes a three-way valve body and a driving end valve component 16, wherein the three-way valve body includes three ports, namely, a first port, a second port, and a third port, wherein the first port is coaxially arranged with the second port, and the axial direction of the third port is perpendicular to the axial directions of the first port and the second port. The first port of the three-way switching valve 13 is directly connected to the four-way switching valve 12 through a flange, the third port is connected to the high-pressure fluid inlet mother pipe 14 through a flange, and the second port is used for the installation and removal of the driving end valve component 16, and the driving end valve component 16 can realize the opening and closing of the first port; when the first port is open, the first port is connected to the third port; when the first port is closed, the first port is not connected to the third port.

[0067] Among them, the driving end reducing flange 11 is a conventional flange connector in this field.

[0068] The driving end valve component 16 includes a driving end valve cover 161 , a driving rod 162 , a driving end valve plate 163 , a driving end valve seat 164 , and a nut 165 .

[0069] The driving end valve cover 161 includes at least a plate body and a columnar body from the outside to the inside, and the diameter of the columnar body is smaller than that of the plate body. The plate body of the driving end valve cover 161 can cover the second port of the four-way switching valve 12 / three-way switching valve 13, and is connected to the second port of the four-way switching valve 12 / three-way switching valve 13 through a flange, which is convenient for installation and disassembly. A threaded blind hole is provided on the outside of the plate body of the driving end valve cover 161 for fixed connection of an external driving mechanism. The driving end valve cover 161 is provided with an axially penetrating through cavity along its central axis, and the through cavity is used to install the driving rod 162. The driving rod 162 can slide coaxially relative to the through cavity, and a dynamic sealing structure is provided between the two.

[0070] like Figure 5As shown, the driving rod 162 preferably adopts a cylindrical rod structure, and includes a first section 1621 and a second section 1622 from the outside to the inside, wherein the outer diameter of the second section 1622 is smaller than the first section 1621. The outer diameter of the first section 1621 matches the inner diameter of the through cavity of the driving end valve cover 161, so as to achieve the coaxial sliding of the driving rod 162 relative to the through cavity. The end of the first section 1621 is provided with an external thread to achieve the threaded connection between the driving rod 162 and the external driving mechanism. The outer diameter of the second section 1622 matches the inner diameter of the through hole of the driving end valve plate 163, so as to achieve the coaxial sliding of the driving end valve plate 163 relative to the driving rod 162. The end of the second section 1622 is provided with an external thread for connecting the nut 165. The step of the first section 1621 relative to the second section 1622 is rounded to form a driving rod sealing arc surface 1625 facing the driving end valve plate 163, which cooperates with the sealing conical surface 1634 of the driving end valve plate 163 to achieve a linear seal between the arc surface and the conical surface at the pressure pre-balancing structure, thereby enhancing the sealing effect. The second section 1622 is provided with a non-through pressure pre-balancing chamber 1623 along its central axis. The pressure pre-balancing chamber 1623 is through at the end of the second section 1622 and is a blind end at the end facing the first section 1621. The blind end of the pressure pre-balancing chamber 1623 is provided with a plurality of radial pressure pre-balancing holes 1624, which are connected to the pressure pre-balancing chamber 1623 to form a fluid flow channel that realizes the pressure pre-balancing function, see. Figure 7 The arrow shown in (b) only shows one direction of fluid flow, and the reverse direction is also possible.

[0071] The driving end valve plate 163 is installed outside the second section 1622 of the driving rod 162, and the driving end valve plate 163 can slide coaxially within a limited distance relative to the driving rod 162. The inner end of the driving rod 162 is installed with a nut 165, which is used to limit the driving end valve plate 163.

[0072] like Figure 6As shown, the driving end valve plate 163 includes a driving end sealing end plate 1631 and a driving end valve plate shaft 1632, and the driving end valve plate shaft 1632 has a smaller outer diameter than the driving end sealing end plate 1631. The driving end valve plate 163 is provided with an axially penetrating through hole along its central axis, and the inner diameter of the through hole matches the outer diameter of the second section 1622 of the driving rod 162, so as to realize the coaxial sliding of the driving end valve plate 163 relative to the second section 1622 of the driving rod 162. For the four-way switching valve 12, the surface of the driving end sealing end plate 1631 faces the fourth port of the four-way switching valve 12; for the three-way switching valve 13, the surface of the driving end sealing end plate 1631 faces the first port of the three-way switching valve 13. A sealing arc surface 1633 is provided at the edge of the surface of the driving end sealing end plate 1631, and the sealing arc surface 1633 cooperates with the conical surface of the driving end valve seat 164 to achieve a line seal of the arc surface to the conical surface, thereby achieving a better sealing effect. A sealing cone surface 1634 is provided at the end of the driving end valve plate shaft 1632, and the sealing cone surface 1634 cooperates with the driving rod sealing arc surface 1625 of the driving rod 162 to achieve a line seal of the cone surface to the arc surface, thereby avoiding the problem of cross-flow and cross-pressure of high-pressure and low-pressure fluids.

[0073] The fourth port of the four-way switching valve 12 and the first port of the three-way switching valve 13 are respectively provided with a necking portion, which provides an end face structure for supporting the driving end valve seat 164, and is the basis for achieving the sealing between the driving end valve plate 163 and the driving end valve seat 164. The driving end valve seat 164 is installed on the end face structure provided by the necking portion, and is connected to the four-way switching valve 12 or the three-way switching valve 13 through circumferentially uniformly distributed bolts. At the same time, the connection between the driving end valve seat 164 and the four-way switching valve 12 or the three-way switching valve 13 is statically sealed by a sealing ring. As a preferred embodiment, the necking portion is arranged in an arc shape, which can make the fluid flow have a better flow state and reduce the local resistance loss of the device.

[0074] like Figure 7 As shown, the driving end valve seat 164 has a central through hole, and the central through hole is set as a conical surface, which cooperates with the sealing arc surface 1633 of the driving end valve plate 163 to achieve a linear seal between the arc surface and the conical surface, thereby enhancing the sealing effect. Specifically, the diameter of the central through hole gradually decreases from the end close to the driving end valve plate 163 to the end away from the driving end valve plate 163, thereby forming a conical surface.

[0075] Figure 8 The typical coaxial positions of the driving rod 162 and the driving end valve plate 163 are shown: a sealed state, a small communication state, and a fully open state.

[0076] like Figure 8As shown in (a), for the sealing state, the sealing arc surface 1633 of the driving end valve plate 163 and the conical surface of the driving end valve seat 164 realize self-tightening wire sealing under the pressure differential force, and the sealing conical surface 1634 of the driving end valve plate 163 and the driving rod sealing arc surface 1625 of the driving rod 162 realize forced wire sealing under the action of a smaller driving force of the external driving mechanism. Therefore, this sealing state is a double sealing state at the driving end sealing end plate 1631 of the driving end valve plate 163 and the pressure pre-balance structure, which has a good sealing effect, effectively avoids the problem of cross-flow and cross-pressure of high and low pressure fluids, and improves the safety and stability of the device. Among them, the self-tightening wire seal refers to the wire sealing structure of the arc surface against the conical surface realizing self-tightening sealing under the action of the fluid pressure differential force; the forced wire seal refers to the forced sealing of the wire sealing structure of the arc surface against the conical surface under the action of the external driving force.

[0077] like Figure 8 As shown in (b), for the small connection state, the sealing end plate 1631 of the driving end valve plate 163 maintains a self-tightening sealing state, while the sealing state at the pressure pre-balancing structure is destroyed, so that the fluid can flow through the pressure pre-balancing chamber 1623 and the pressure pre-balancing hole 1624 of the driving rod 162 in sequence (that is, the fluid flow direction shown by the arrow in the figure, and the reverse direction is also possible). The size of the flow channel is much smaller than the flow channel size after the driving end valve plate 163 is opened, so it is called a small connection state; in this connection process, fluids with different pressures on both sides of the driving end valve plate 163 are in direct contact, achieving the effect of pressure pre-balancing, which can reduce the driving force required to be provided by the external driving mechanism, facilitate the opening of the driving end valve plate 163, reduce the energy consumption of the system, and avoid the addition of an additional set of pressure pre-balancing valve groups and supporting pipelines, thereby simplifying the device structure.

[0078] like Figure 8 As shown in (c), for the fully open state, the nut 165 limits the driving end valve plate 163, so the double sealing structure is destroyed in this state, the driving end valve plate 163 is in the fully open state, the fluid can flow normally, and the pressure coupling device performs the pressurization process or the pressure relief process.

[0079] Obviously, the distance between the nut 165 and the driving end valve plate 163 is the farthest in the sealed state, the distance between the nut 165 and the driving end valve plate 163 is the shortest in the fully open state (the corresponding end faces are in direct contact to achieve position limiting), and the distance between the two in the small connection state is between the above distances. Therefore, during the opening process of the four-way switching valve 12 / three-way switching valve 13, the external driving mechanism drives the driving rod 162 to move, and the device transitions from the sealed state to the small connection state, and after a certain period of time to complete the pressure pre-balancing process, it transitions to the fully open state to complete the pressurization process or the pressure relief process; the closing process is the opposite of the above sequence.

[0080] like Fig. 9As shown, the response end module 3 includes a response end reducing flange 31, a four-way check valve 32, and a three-way check valve 33, which are respectively connected to the pressure exchange cylinder 2, the low-pressure fluid inlet mother pipe 35, and the high-pressure fluid outlet mother pipe 34.

[0081] like Fig.10 As shown, the four-way check valve 32 includes a four-way valve body and a response end valve component 36, wherein the four-way valve body includes four ports, namely, a first port, a second port, a third port, and a fourth port, wherein the first port is coaxially arranged with the third port, the second port is coaxially arranged with the fourth port, and the axial directions of the first port and the third port are perpendicular to the axial directions of the second port and the fourth port. The first port of the four-way check valve 32 is connected to the pressure exchange cylinder 2 through the response end reducer flange 31, the third port is directly connected to the three-way check valve 33 through a flange, and the fourth port is connected to the low-pressure fluid inlet mother pipe 35 through a flange. The second port is provided for the installation and disassembly of the response end valve component 36, and the response end valve component 36 can realize the opening and closing of the fourth port; when the fourth port is open, the fourth port is connected to the first port and the third port; when the fourth port is closed, only the first port is connected to the third port.

[0082] like Fig.11 As shown, the three-way check valve 33 includes a three-way valve body and a response end valve component 36, wherein the three-way valve body includes three ports, namely, a first port, a second port, and a third port, wherein the first port is coaxially arranged with the second port, and the axial direction of the third port is perpendicular to the axial directions of the first port and the second port. The first port of the three-way check valve 33 is directly connected to the four-way check valve 32 through a flange, the third port is connected to the high-pressure fluid outlet mother pipe 34 through a flange, and the second port is used for the installation and removal of the response end valve component 36, and the response end valve component 36 can realize the opening and closing of the first port; when the first port is open, the first port is connected to the third port; when the first port is closed, the first port is not connected to the third port.

[0083] The responding end reducing flange 31 is a conventional flange connector in the art.

[0084] The response end valve component 36 includes a response end valve cover 361 , a response end valve plate 362 , a response end valve seat 363 , and a spring 364 .

[0085] like Fig.12As shown, the response end valve cover 361 includes at least a plate body and a columnar body from the outside to the inside, and the diameter of the columnar body is smaller than that of the plate body. The plate body of the response end valve cover 361 can cover the second port of the four-way check valve 32 / three-way check valve 33, and is connected to the second port of the four-way check valve 32 / three-way check valve 33 through a flange, which is convenient for installation and disassembly. The columnar body of the response end valve cover 361 is provided with a non-through cavity along its central axis at one end away from the plate body, and the non-through cavity is used to install the response end valve plate 362. Preferably, the columnar body of the response end valve cover 361 is provided with a plurality of radial windows at one end close to the plate body, and the radial windows are connected to the non-through cavity; the plurality of radial windows are preferably evenly distributed in the circumferential direction of the columnar body, so as to reduce the fluid flow resistance during the opening and closing process of the response end valve plate 362.

[0086] like Fig.13 As shown, the response end valve plate 362 at least includes a response end sealing end plate 3621 and a response end valve plate shaft 3622, and the diameter of the response end valve plate shaft 3622 is smaller than that of the response end sealing end plate 3621. The outer diameter of the response end valve plate shaft 3622 matches the inner diameter of the non-through cavity of the response end valve cover 361 to achieve the axial sliding of the response end valve plate 362 relative to the response end valve cover 361. For the four-way check valve 32, the surface of the response end sealing end plate 3621 faces the fourth port of the four-way check valve 32; for the three-way check valve 33, the surface of the response end sealing end plate 3621 faces the first port of the three-way check valve 33. A sealing arc surface is provided at the edge of the surface of the response end sealing end plate 3621 of the response end valve plate 362, and the sealing arc surface cooperates with the conical surface of the response end valve seat 363 to achieve a linear seal of the arc surface to the conical surface, thereby achieving a better sealing effect.

[0087] The spring 364 is sleeved on the column part of the response end valve cover 361 and the outer side of the valve plate shaft of the response end valve plate 362. One end of the spring 364 is limited by the outer side shaft shoulder of the column part of the response end valve cover 361, and the other end is limited by the response end sealing end plate 3621 toward the end face of the response end valve cover 361. As a preferred embodiment, a spring limiting boss is provided in the center of the response end sealing end plate 3621 to better fix the spring 364.

[0088] The fourth port of the four-way check valve 32 and the first port of the three-way check valve 33 are respectively provided with a necking portion, which provides an end surface structure for supporting the response end valve seat 363, and is the basis for achieving the sealing between the response end valve plate 362 and the response end valve seat 363. The response end valve seat 363 is installed on the end surface structure provided by the necking portion, and is connected to the four-way check valve 32 or the three-way check valve 33 through annularly uniform bolts. At the same time, the connection between the response end valve seat 363 and the four-way check valve 32 or the three-way check valve 33 is statically sealed through a sealing ring. As a preferred embodiment, the necking portion is set to an arc shape, which can make the fluid flow have a better flow state and reduce the local resistance loss of the device.

[0089] The response end valve seat 363 is completely consistent with the drive end valve seat 164 in structure, which will not be described here. Obviously, when the response end valve plate 362 and the response end valve seat 363 form a sealing state, the response end valve plate shaft 3622 will not separate from the non-through cavity of the response end valve cover 361.

[0090] The switching valve and pressure coupling device with pressure pre-balancing function of the present invention have the following working process:

[0091] For a single-cylinder basic unit, there are three processes in the working state: pressurization process, pressure relief process, and shutdown waiting process. These three processes are switched and performed alternately in order according to the logic and duration of the control strategy.

[0092] For the pressurization process, when the pressure exchange cylinder 2 contains low-pressure fluid, the three-way switching valve 13 of the driving end module 1 starts to operate under the action of the external driving mechanism, first realizing a small connection to balance the pressure on both sides of its driving end valve plate 163, and then the driving end valve plate 163 is opened, and the high-pressure fluid flows into the device from the high-pressure fluid inlet mother pipe 14 to perform the pressurization process. At the same time, the three-way check valve 33 of the response end module 3 starts to respond, opens its response end valve plate 362, and allows the high-pressure fluid inside the pressure exchange cylinder 2 to flow out of the device from the high-pressure fluid outlet mother pipe 34, realizing the connection of the high-pressure flow channel. During this pressurization process, the four-way switching valve 12 of the driving end module 1 closes automatically under the action of the pressure difference, disconnecting the cylinder body from the low-pressure fluid outlet mother pipe 15; the four-way check valve 32 of the response end module 3 also closes automatically under the action of the pressure difference, disconnecting the pressure exchange cylinder body 2 from the low-pressure fluid inlet mother pipe 35. Therefore, the pressure exchange cylinder body 2 is the flow of high-pressure fluid, and the low-pressure fluid is disconnected by the driving end valve plate 163 and the response end valve plate 362 at both ends, avoiding the high and low pressure series flow of the device, which is conducive to the normal and stable operation of the device.

[0093] For the pressure relief process, when the pressure exchange cylinder 2 contains high-pressure fluid, the four-way switching valve 12 of the driving end module 1 starts to operate under the action of the external driving mechanism, first achieving a small connection to balance the pressure on both sides of its driving end valve plate 163, and then the driving end valve plate 163 is opened, and the low-pressure fluid flows out of the device from the low-pressure fluid outlet mother pipe 15 to perform the pressure relief process. At the same time, the four-way check valve 32 of the response end module 3 starts to respond, opens its response end valve plate 362, and allows the low-pressure fluid to flow into the device from the low-pressure fluid inlet mother pipe 35, achieving the connection of the low-pressure flow channel. During this pressure relief process, the three-way switching valve 13 of the driving end module 1 closes automatically under the action of the pressure difference, disconnecting the cylinder body from the high-pressure fluid inlet mother pipe 14; the three-way check valve 33 of the response end module 3 also closes automatically under the action of the pressure difference, disconnecting the pressure exchange cylinder body 2 from the high-pressure fluid outlet mother pipe 34. Therefore, the cylinder body is circulated with low-pressure fluid, and the high-pressure fluid is disconnected by the driving end valve plate 163 and the response end valve plate 362 at both ends, avoiding high and low pressure series flow of the device, which is conducive to the normal and stable operation of the device.

[0094] When the pressure coupling device completes the pressurization process or the pressure relief process, all valve plates are in a closed state, which is the closed waiting process of the device. After the process is completed, the next pressure relief process or pressurization process will be carried out immediately to achieve orderly switching and normal operation of the entire working process of the device.

[0095] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A switching valve with a pressure pre-balancing function, comprising a valve body with a plurality of connection ports, characterized in that: The valve body is installed with a driving end valve component; the driving end valve component includes a driving end valve cover, a driving rod, a driving end valve plate, a driving end valve seat, and a nut; the connection port A of the valve body is used for installation and removal of the driving end valve component; the connection port B of the valve body is controlled to open and close by the driving end valve component; the connection port A and the connection port B are coaxially arranged relative to each other; The driving end valve cover covers and is fixed to the connection port A of the valve body, and is provided with an axially penetrating through cavity along its central axis, and the through cavity is used to install the driving rod; The driving rod comprises a first section and a second section, wherein the outer diameter of the second section is smaller than that of the first section; the end of the first section is used to connect an external driving mechanism, the first section can slide coaxially relative to the through cavity of the driving end valve cover, and a dynamic seal is arranged between the first section and the through cavity; a nut is installed at the end of the second section, and the nut is used to limit the driving end valve plate; the second section is provided with a non-through pressure pre-balancing cavity along its central axis, the pressure pre-balancing cavity is through at the end of the second section and is arranged as a blind end toward the first section; a plurality of radial pressure pre-balancing holes are opened at the blind end of the pressure pre-balancing cavity, and the pressure pre-balancing holes are connected with the pressure pre-balancing cavity; The driving end valve plate is installed outside the second section of the driving rod, and includes a driving end sealing end plate and a driving end valve plate shaft, wherein the driving end valve plate shaft has a smaller outer diameter than the driving end sealing end plate; the driving end valve plate is provided with an axially penetrating through hole along its central axis, and the through hole is used to realize the coaxial sliding of the driving end valve plate relative to the second section of the driving rod; the surface of the driving end sealing end plate faces the connection port B of the valve body, and a sealing arc surface is provided at the edge of the surface of the driving end sealing end plate; The driving end valve seat is fixedly installed at the necked part of the connection port B of the valve body and realizes static sealing at the connection; the driving end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the driving end valve seat cooperates with the sealing arc surface of the driving end valve plate to realize the linear sealing of the arc surface to the conical surface.

2. A switching valve with pressure pre-balancing function according to claim 1, characterized in that: The valve body has at least three connection ports.

3. The switching valve with pressure pre-balancing function according to claim 1, characterized in that: The necking portion of the connection port B of the valve body is configured to be arc-shaped.

4. The switching valve with pressure pre-balancing function according to claim 1, characterized in that: The driving end valve cover includes a plate body and a columnar body from the outside to the inside, and the diameter of the columnar body is smaller than that of the plate body; the plate body can cover the connection port A of the valve body, and is connected to the connection port A of the valve body through a flange; the through cavity axially penetrates along the central axis of the plate body and the columnar body.

5. The switching valve with pressure pre-balancing function according to claim 1, characterized in that: A driving rod sealing arc surface is provided at the step of the first section of the driving rod relative to the second section, and a sealing conical surface is provided at the end of the driving end valve plate shaft of the driving end valve plate; the driving rod sealing arc surface cooperates with the sealing conical surface of the driving end valve plate to realize linear sealing of the arc surface to the conical surface.

6. The switching valve with pressure pre-balancing function according to claim 1, characterized in that: The pressure pre-balancing holes are evenly arranged along the circumferential direction of the driving rod.

7. A pressure coupling device with a pressure pre-balancing function, comprising at least two single-cylinder devices arranged side by side, characterized in that: The single cylinder device comprises a driving end module, a response end module and a pressure exchange cylinder, wherein the pressure exchange cylinder is arranged between the driving end module and the response end module; The driving end module comprises a four-way switching valve and a three-way switching valve, and both the four-way switching valve and the three-way switching valve are provided with a driving end valve component; The first port of the four-way switching valve is connected to the pressure exchange cylinder through a flange, the third port is connected to the three-way switching valve through a flange, the fourth port is used to connect to the low-pressure fluid outlet main pipe, and the second port is used for the installation and removal of the driving end valve component, and the driving end valve component can realize the opening and closing of the fourth port; wherein the second port and the fourth port of the four-way switching valve are coaxially arranged opposite to each other; The first port of the three-way switching valve is connected to the four-way switching valve through a flange, the third port is used to connect the high-pressure fluid inlet main pipe, and the second port is used for installation and removal of the driving end valve component, and the driving end valve component can realize the opening and closing of the first port; wherein the first port and the second port of the three-way switching valve are coaxially arranged opposite to each other; The driving end valve components include a driving end valve cover, a driving rod, a driving end valve plate, a driving end valve seat, and a nut; The driving end valve cover covers and is fixed to the second port of the four-way switching valve and the second port of the three-way switching valve, and is provided with an axially penetrating through cavity along its central axis, and the through cavity is used to install the driving rod; The driving rod comprises a first section and a second section, wherein the outer diameter of the second section is smaller than that of the first section; the end of the first section is used to connect an external driving mechanism, the first section can slide coaxially relative to the through cavity of the driving end valve cover, and a dynamic seal is arranged between the first section and the through cavity; a nut is installed at the end of the second section, and the nut is used to limit the driving end valve plate; the second section is provided with a non-through pressure pre-balancing cavity along its central axis, the pressure pre-balancing cavity is through at the end of the second section and is arranged as a blind end toward the first section; a plurality of radial pressure pre-balancing holes are opened at the blind end of the pressure pre-balancing cavity, and the pressure pre-balancing holes are connected with the pressure pre-balancing cavity; The driving end valve plate is installed outside the second section of the driving rod, and includes a driving end sealing end plate and a driving end valve plate shaft, and the driving end valve plate shaft has a smaller outer diameter than the driving end sealing end plate; the driving end valve plate is provided with an axially penetrating through hole along its central axis, and the through hole is used to realize the coaxial sliding of the driving end valve plate relative to the second section of the driving rod; the surface of the driving end sealing end plate faces the fourth port of the four-way switching valve and the first port of the three-way switching valve, and a sealing arc surface is provided at the edge of the surface of the driving end sealing end plate; The driving end valve seat is fixedly mounted at the necking portion of the fourth port of the four-way switching valve and the necking portion of the first port of the three-way switching valve, and static sealing is achieved at the connection; the driving end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the driving end valve seat cooperates with the sealing arc surface of the driving end valve plate to achieve linear sealing of the arc surface to the conical surface; The response end module comprises a four-way check valve and a three-way check valve, and both the four-way check valve and the three-way check valve are provided with a response end valve component; The first port of the four-way check valve is connected to the pressure exchange cylinder through a flange, the third port is connected to the three-way check valve through a flange, the fourth port is used to connect to the low-pressure fluid inlet main pipe, and the second port is used for the installation and removal of the response end valve component, and the response end valve component can realize the opening and closing of the fourth port; wherein the second port of the four-way check valve is coaxially arranged with the fourth port; The first port of the three-way check valve is connected to the four-way check valve through a flange, the third port is used to connect to the high-pressure fluid outlet main pipe, and the second port is used for the installation and removal of the response end valve component, and the response end valve component can realize the opening and closing of the first port; wherein the first port and the second port of the three-way check valve are coaxially arranged opposite to each other; The response end valve component includes a response end valve cover, a response end valve plate, a response end valve seat, and a spring; The response end valve cover comprises a plate body and a column body, wherein the diameter of the column body is smaller than that of the plate body; the plate body of the response end valve cover covers and is fixed to the second port of the four-way check valve and the second port of the three-way check valve, and the column body of the response end valve cover is provided with a non-through cavity along its central axis at one end away from the plate body, and the non-through cavity is used to install the response end valve plate; The response end valve plate comprises a response end sealing end plate and a response end valve plate shaft, the diameter of the response end valve plate shaft is smaller than that of the response end sealing end plate; the response end valve plate shaft is inserted into the non-through cavity of the response end valve cover, so that the response end valve plate can slide axially relative to the response end valve cover; the surface of the response end sealing end plate faces the fourth port of the four-way check valve and the first port of the three-way check valve, and a sealing arc surface is provided at the edge of the surface of the response end sealing end plate; the spring sleeve is on the columnar portion of the response end valve cover and the outer side of the valve plate shaft of the response end valve plate; The response end valve seat is fixedly installed at the necked portion of the fourth port of the four-way check valve and the necked portion of the first port of the three-way check valve, and realizes static sealing at the connection; the response end valve seat has a central through hole, and the central through hole is set as a conical surface; the conical surface of the response end valve seat cooperates with the sealing arc surface of the response end valve plate to realize the linear sealing of the arc surface to the conical surface.

8. The pressure coupling device with pressure pre-balancing function according to claim 7, characterized in that: The driving end valve cover includes a plate body and a columnar body from the outside to the inside, and the diameter of the columnar body is smaller than that of the plate body; the plate body can cover the second port of the four-way switching valve and the second port of the three-way switching valve, and is connected to the second port of the four-way switching valve and the second port of the three-way switching valve through a flange; the through cavity axially penetrates the plate body and the columnar body along the central axis; A driving rod sealing arc surface is provided at the step of the first section of the driving rod relative to the second section, and a sealing conical surface is provided at the end of the driving end valve plate shaft of the driving end valve plate; the driving rod sealing arc surface cooperates with the sealing conical surface of the driving end valve plate to achieve a line seal between the arc surface and the conical surface; The pressure pre-balancing holes are evenly arranged along the circumferential direction of the driving rod.

9. The pressure coupling device with pressure pre-balancing function according to claim 7, characterized in that: The columnar portion of the response end valve cover is provided with a plurality of radial windows at one end close to the plate body, and the plurality of radial windows are connected to the non-through cavity; One end of the spring is limited by the outer shoulder of the column part of the responding end valve cover, and the other end is limited by the end surface of the responding end valve plate toward the responding end valve cover; A spring limiting boss is arranged at the center of the response end sealing end plate, and the spring limiting boss is used to fix the spring.

10. The pressure coupling device with pressure pre-balancing function according to claim 7, characterized in that: The necking parts of the four-way switching valve, the three-way switching valve, the four-way check valve and the three-way check valve are respectively arranged in an arc shape.

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