Pressure reducing valve with multi-stage pressure regulation function

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a multi-stage pressure regulating pressure reducing valve which comprises a main valve and a plurality of pressure reducing pilot valve branches, the main valve comprises a valve body internally provided with an induction cavity and a main valve clack, and an induction cavity communicated with an inlet is formed between the main valve clack and the induction cavity; the main valve clack can reciprocate along with the force difference change of the inlet of the main valve and the induction cavity so as to adjust the opening degree of the inlet. Pressure reduction pilot valves are arranged in the pressure reduction pilot valve branches, and the preset pressure values of the pressure reduction pilot valves are different. Except for the pressure reduction pilot valve branch where the pressure reduction pilot valve with the lowest preset pressure value is located, switch valves are arranged in the other pressure reduction pilot valve branches; the pressure reducing valve further comprises a pressure sensor and a control module, the pressure sensor is used for detecting the downstream pressure of the main valve, and the control module is used for selectively controlling opening and closing of the switching valves according to pre-input time period information and a target pressure value so that the outlet pressure of the valve body can be adjusted to reach the pre-input target pressure value range. According to the pressure reducing valve, multi-stage adjustment of downstream pressure can be achieved.

Description

Technical Field

[0001] This application belongs to the technical field of valves, and more specifically, relates to a pressure reducing valve with multi-stage pressure regulation. Background Art

[0002] A pressure reducing valve is a valve used to regulate high-pressure media (gas or liquid) to a lower and stable pressure. Its main function is to control the output pressure of the media to ensure that downstream equipment or systems can operate within a safe and stable pressure range.

[0003] Currently, installing pressure reducing valves in pipe networks is an important means for major water supply enterprises to control the operating pressure of pipe networks. However, in actual use, since traditional pressure reducing valves are basically single-control pressure reducing valves, the set value of the pressure behind the valve is constant, and only one pressure value behind the valve can be obtained. When the pipe network is in a low-flow operation state at night, there are often situations such as high pipe network pressure, large leakage, large pipe network load, and easy pipe explosion; when the pipe network operation reaches the peak water consumption period of users, there is often insufficient water use pressure and no water at local ends, making it difficult to meet the use requirements. Summary of the Utility Model

[0004] In view of the defects or improvement requirements of the prior art, this application provides a pressure reducing valve with multi-stage pressure regulation, aiming to provide a pressure reducing valve that can perform multi-stage regulation on the pressure behind the valve to meet the changing operating requirements of the pipe network.

[0005] A pressure reducing valve with multi-stage pressure regulation provided by this application specifically includes a main valve and multiple parallel pressure reducing pilot valve branches, where:

[0006] The main valve includes a valve body with an induction cavity built therein. A main valve flap is arranged in the valve body and is movably and sealingly connected to the induction cavity. An induction chamber is formed between one end of the main valve flap and the induction cavity, and this induction chamber is communicated with the inlet of the main valve. The main valve flap can reciprocate with the change of the force difference between the inlet of the main valve and the induction chamber to adjust the opening degree of the inlet.

[0007] The pressure reducing pilot valve branches are respectively connected to the induction chamber and the outlet of the valve body. A pressure reducing pilot valve is arranged in the pressure reducing pilot valve branch, and the preset pressure values of the pressure reducing pilot valves in multiple pressure reducing pilot valve branches are different. The pressure reducing pilot valve can close the pressure reducing pilot valve branch when the outlet pressure value of the valve body is higher than its own preset pressure value.

[0008] Except for the pressure reducing pilot valve branch where the pressure reducing pilot valve with the lowest preset pressure value is located, switching valves for switching the pressure reducing pilot valve branch are arranged in the remaining pressure reducing pilot valve branches.

[0009] The pressure reducing valve further includes a pressure sensor and a control module. The control module is electrically connected to the pressure sensor and the switching valve respectively. The pressure sensor is used to detect the pressure behind the main valve, and the control module is used to selectively control the opening and closing of each switching valve according to the pre-input time period information and target pressure value, so as to adjust the outlet pressure of the valve body to reach the range of the pre-input target pressure value.

[0010] Through the above technical solution conceived by the present application, compared with the prior art, the pressure reducing valve with multi-stage pressure regulation of the present invention can realize multi-stage regulation of the pressure behind the valve, and can automatically adjust the pressure behind the valve of the pressure reducing valve according to the usage requirements in different time periods, so as to better meet the changing operation requirements of the pipe network.

[0011] For example: when the water consumption is small at night, the control module sets the pressure behind the pressure reducing valve to a low pressure to reduce the leakage of the pipe network and extend the service life of the pipeline; during normal daytime, the control module sets the pressure behind the pressure reducing valve to normal to meet the water usage requirements; during the peak water usage period, it is set to a high pressure period to ensure normal pressure at the local end.

[0012] As a further preference, the switching valve is a solenoid valve or an electric valve.

[0013] As a further preference, the switching valve is a normally open power-off automatic reset valve or a normally closed power-off automatic reset valve.

[0014] As a further preference, an elastic member is connected between the main valve flap and the induction cavity, and the elastic member is used to apply an elastic force towards the inlet to the main valve flap.

[0015] As a further preference, the main valve flap is provided with an induction channel, and the induction cavity is communicated with the inlet of the main valve through the induction channel.

[0016] As a further preference, the main valve flap has an outer side surface facing the inlet of the main valve and an inner side surface facing the induction cavity, and the surface area of the inner side surface of the main valve flap is larger than the surface area of its outer side surface.

[0017] As a further preference, a needle valve is installed in the induction channel, and the circumferential surface of the needle valve is in sealing fit with the inner wall of the induction channel.

[0018] As a further preference, a valve seat for forming a sealing pair with the main valve flap is provided at the inlet of the main valve. The valve seat is circumferentially and sealingly connected to the inner wall of the valve body, and the main valve flap is restricted in the valve body by the valve seat.

[0019] As a further preference, an installation pipe is sealingly connected to the valve body. One end of the installation pipe is connected to the induction cavity by bypassing from the outside of the valve body, and the other end of the installation pipe is connected to the pressure reducing pilot valve branch.

[0020] As a further preference, the installation pipe is detachably connected to the valve body.

[0021] Generally speaking, compared with the prior art by the above technical solutions conceived by the present application, the following technical advantages are mainly possessed:

[0022] 1. This pressure reducing valve can realize intelligent control of various post-valve pressures, and can automatically adjust the post-valve pressure to a specific target pressure value range within a specific time period according to the requirements input by the user, so as to meet the changing operation requirements of the user for the pipe network.

[0023] 2. The switching valve in this pressure reducing valve can be selected as a normally open power-off automatic reset valve or a normally closed power-off automatic reset valve, so that the pressure reducing valve obtains the effect of high post-valve pressure or low post-valve pressure after power-off. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a pressure reducing valve with multi-stage pressure regulation provided by an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of the main valve provided by an embodiment of the present application.

[0026] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0027] 1. Valve body; 1-1. Induction cavity; 2. Main valve flap; 3. Pressure reducing pilot valve; 4. Switching valve; 5. Control module; 6. Needle valve; 7. Elastic member; 8. Valve seat; 9. Installation pipe; 10. Induction cavity; 20. Inlet; 30. Outlet; 40. Induction channel. Detailed Embodiments

[0028] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] The following combines the attached Figure 1-2 The present application will be further described in detail.

[0030] An embodiment of the present application discloses a pressure reducing valve with multi-stage pressure regulation. Refer to Figure 1-2The multi-stage pressure-regulating pressure-reducing valve includes a main valve and multiple parallel pressure-reducing pilot valve branches. The main valve includes a valve body 1 with a built-in sensing chamber 1-1. A main valve flap 2 is provided within the valve body 1 and is movably and hermetically connected to the sensing chamber 1-1. A sensing chamber 10 is formed between one end of the main valve flap 2 and the sensing chamber 1-1. The sensing chamber 10 is connected to the inlet 20 of the main valve. The main valve flap 2 can reciprocate in response to the pressure difference between the inlet 20 of the main valve and the sensing chamber 10 to adjust the opening of the inlet 20. The pressure-reducing pilot valve branches are respectively connected to the sensing chamber 10 and the outlet 30 of the valve body 1. A pressure-reducing pilot valve 3 is provided in each of the pressure-reducing pilot valve branches. The preset pressure values of the pressure-reducing pilot valves 3 in the multiple pressure-reducing pilot valve branches are different. The pressure-reducing pilot valve 3 can close the pressure-reducing pilot valve branch when the outlet pressure of the valve body 1 exceeds its own preset pressure value. With the exception of the pressure-reducing pilot valve branch containing the lowest preset pressure-value pressure-reducing pilot valve 3, all other pressure-reducing pilot valve branches are equipped with on / off valves 4 for opening and closing the pressure-reducing pilot valve branches. Furthermore, the pressure-reducing valve includes a pressure sensor and a control module 5, which are electrically connected to the pressure sensor and on / off valve 4, respectively. The pressure sensor is used to detect the downstream pressure of the main valve (not shown in the figure). The control module 5 is used to selectively control the opening and closing of each on / off valve 4 based on pre-input time period information and a target pressure value, thereby regulating the outlet pressure of the valve body 1 to within the pre-input target pressure range.

[0031] It should be noted that during the operation of the pressure reducing valve, when the pressure sensed by the pressure reducing pilot valve 3 is within the preset pressure range, the opening degree of the main valve will be automatically adjusted to maintain the stability of the pressure after the main valve (i.e., the downstream pressure, the outlet pressure of the main valve). Once the downstream pressure exceeds the preset pressure value, the pressure reducing pilot valve 3 will close, and the main valve will close accordingly, and then the downstream pressure will decrease; when the downstream pressure is within the preset pressure range, the pressure reducing pilot valve 3 will open, and the pressure reducing pilot valve 3 will adjust its own opening in response to the pressure change, so that the water in the sensing chamber 10 flows into the outlet 30 of the main valve at different flow rates through the pressure reducing pilot valve branch, thereby controlling the pressure difference between the inlet 20 of the main valve and the sensing chamber 10, achieving the purpose of controlling the opening of the main valve disc 2, so that the downstream pressure is always maintained at a stable target pressure.

[0032] Under this design, the multi-stage pressure-regulating pressure reducing valve can realize multi-stage adjustment of the pressure behind the valve, and can automatically adjust the pressure behind the valve according to the usage requirements in different time periods, so as to better cope with the changing operation requirements of the pipeline network.

[0033] Generally speaking, the target pressure values that can be input into the control module 5 are multiple specific values, and these specific values can be obtained based on the number of pressure-reducing pilot valve branches and the preset pressure values of the relevant pressure-reducing pilot valves 3. That is, during the debugging stage, the outlet pressure values of the main valve when each pressure-reducing pilot valve branch forms a stable medium flow with the main valve alone are measured one by one through a pressure sensor, and these measured outlet pressure values are entered into the control module 5 as target pressure values. Then, several time period information is input into the control module 5 according to requirements, so that the control module 5 controls the opening and closing of multiple switching valves 4 based on the time period information and the target pressure values through the built-in PLC control system.

[0034] When this pressure-reducing valve is applied to scenarios such as pipe networks and secondary pump houses, when the actual time reaches the input time period, the control module 5 regulates each switching valve 4 according to the target pressure value corresponding to this time period, so that the pressure-reducing pilot valve branch corresponding to this target pressure value can form a conduction with the main valve, realizing closed-loop control. The input parameters and program settings of the control module 5 are prior art and will not be elaborated here.

[0035] Therefore, based on the number of pressure-reducing pilot valve branches, this pressure-reducing valve can be set to multiple working sections / conditions such as low-pressure working periods, normal-pressure working periods, and high-pressure working periods. For example:

[0036] When the pressure-reducing valve is set to the low-pressure working period, the control module 5 controls the switching valves 4 on all pressure-reducing pilot valve branches to close, and only the pressure-reducing pilot valve branch without a switching valve 4 works, that is, the pressure-reducing pilot valve 3 with the lowest preset pressure value works, making the pressure behind the valve low pressure.

[0037] When the pressure-reducing valve is set to the normal-pressure working period, the control module 5 controls the switching valve 4 corresponding to this normal-pressure working period on the pressure-reducing pilot valve branch to open. Due to the existence of multiple pressure-reducing pilot valves 3, the pressure-reducing pilot valve 3 with the lowest preset pressure value automatically closes because the pressure behind the valve is higher than its set pressure, while the pressure-reducing pilot valve 3 corresponding to the normal pressure works. Under the adjustment of the pressure-reducing pilot valve 3 corresponding to the normal pressure, the pressure behind the main valve is normal pressure.

[0038] When the pressure-reducing valve is set to the high-pressure working period, the control module 5 controls the switching valve 4 corresponding to this high-pressure working period on the pressure-reducing pilot valve branch to open. The pressure-reducing pilot valve 3 with a low preset pressure value automatically closes because the pressure behind the valve is higher than its set pressure; while the pressure-reducing pilot valve 3 corresponding to the high pressure works. Under the adjustment of the pressure-reducing pilot valve 3 corresponding to the high pressure, the pressure behind the main valve is high pressure.

[0039] Therefore, under the design of this solution, this multi-stage pressure-regulating pressure-reducing valve can be intelligently applied to the flexible and variable requirements of the pipe network. For example, when the water consumption is small at night, the control module 5 sets the pressure behind the pressure-reducing valve to a low pressure to reduce pipe network leakage and extend the service life of the pipeline; during normal daytime hours, the control module 5 sets the pressure behind the pressure-reducing valve to normal to meet the water demand; during peak water consumption periods, it is set to a high-pressure period to ensure normal pressure at the local end.

[0040] Furthermore, the on-off valve 4 can be set as a solenoid valve or an electric valve according to actual needs. When it is selected as an electric valve, it is preferably an electric valve with a power-off automatic reset function to extend the service life of the valve. The specific selection of the on-off valve 4 is determined according to the actual switching time requirements. For example, when the pressure-reducing valve needs to be set to the condition of high pressure behind the valve after power-off, the on-off valve 4 is selected as a normally open power-off automatic reset valve; when it needs to be set to the condition of low pressure behind the valve after power-off, the on-off valve 4 is selected as a normally closed power-off automatic reset valve.

[0041] Furthermore, to achieve the opening adjustment of the main valve, in the main valve, the main valve flap 2 has an outer side facing the inlet 20 of the main valve and an inner side facing the sensing chamber 10. The surface area of the inner side of the main valve flap 2 is larger than that of its outer side.

[0042] Furthermore, as Figure 2 shown, an elastic member 7 is also connected between the main valve flap 2 and the sensing cavity body 1-1. The elastic member 7 includes but is not limited to a spring. The elastic member 7 is used to apply an elastic force towards the inlet 20 to the main valve flap 2.

[0043] Correspondingly, a valve seat 8 for forming a sealing pair with the main valve flap 2 is provided at the inlet 20 of the main valve. The valve seat 8 is circumferentially sealed and connected to the inner wall of the valve body 1, and the main valve flap 2 is restricted within the valve body 1 by the valve seat 8. When there is no medium flowing into the inlet 20 of the main valve, the main valve flap 2 moves under the elastic force of the elastic member 7 to abut against the valve seat 8, closing the inlet 20 of the main valve. When the medium flows into the inlet 20 of the main valve, the main valve flap 2 can reciprocally move with the change of the force difference between the inlet 20 and the sensing chamber 10 to adjust the opening of the inlet 20. When the inlet 20 is opened, the medium can enter the interior of the main valve along the inlet 20, and then flow to the outlet 30 and be discharged along the passage formed between the outer surface of the sensing cavity body 1-1 and the inner surface of the valve body 1.

[0044] Furthermore, an installation pipe 9 is hermetically connected to the valve body 1. One end of the installation pipe 9 is connected to the sensing chamber 10 by bypassing from the outside of the valve body 1, and the other end of the installation pipe 9 is connected to a branch pipe in the pressure-reducing pilot valve branch. Preferably, the installation pipe 9 is detachably connected to the valve body 1.

[0045] Furthermore, the main valve flap 2 is provided with an induction channel 40. The induction cavity 10 is communicated with the inlet 20 of the main valve through the induction channel 40. When the medium flows into the main valve along the inlet 20, part of the medium flows into the induction cavity 10 along the induction channel 40, and then the medium enters the pressure-reducing pilot valve branch along the installation pipe 9. The pressure-reducing pilot valve 3 in the pressure-reducing pilot valve branch will adjust its own opening degree according to the change of pressure, so as to realize the adjustment of the medium flow rate flowing through the pressure-reducing pilot valve branch, and further realize the pressure adjustment of the induction cavity 10. Subsequently, the medium flowing through the pressure-reducing pilot valve branch will flow back to the outlet 30 of the main valve and flow out. The remaining medium will push the outer side of the main valve flap 2, and the main valve flap 2 will open the inlet 20 of the main valve according to the change of the pressure difference, and then the medium will flow to the outlet 30 and be discharged.

[0046] Furthermore, a needle valve 6 is installed in the induction channel 40. The circumferential surface of the needle valve 6 is hermetically fitted with the inner wall of the induction channel 40. The needle valve 6 can be used to adjust the medium flow rate of the induction channel 40, so as to adjust the sensitivity of the main valve flap 2.

[0047] It should be understood that the expressions such as "including" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit the existence of one or more additional functions, operations and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component or their combination, but cannot be interpreted as excluding the existence or possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components or their combinations.

[0048] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0050] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A pressure reducing valve with multi-stage pressure regulation, characterized in that, It includes a main valve and multiple parallel pressure-reducing pilot valve branches, where: The main valve includes a valve body (1) with an induction cavity (1-1) built therein. A main valve flap (2) is arranged in the valve body (1) and is movably and sealingly connected to the induction cavity (1-1). An induction chamber (10) is formed between one end of the main valve flap (2) and the induction cavity (1-1). This induction chamber (10) is communicated with the inlet (20) of the main valve. The main valve flap (2) can reciprocally move with the change of the force difference between the inlet (20) of the main valve and the induction chamber (10) to adjust the opening degree of the inlet (20). The pressure-reducing pilot valve branches are respectively connected to the induction chamber (10) and the outlet (30) of the valve body (1). A pressure-reducing pilot valve (3) is arranged in the pressure-reducing pilot valve branches, and the preset pressure values of the pressure-reducing pilot valves (3) in the multiple pressure-reducing pilot valve branches are different from each other. The pressure-reducing pilot valve (3) can close the pressure-reducing pilot valve branch when the outlet pressure value of the valve body (1) is higher than its own preset pressure value. Except for the pressure-reducing pilot valve branch where the pressure-reducing pilot valve (3) with the lowest preset pressure value is located, a switching valve (4) for switching the pressure-reducing pilot valve branch is arranged in the remaining pressure-reducing pilot valve branches. The pressure-reducing valve further includes a pressure sensor and a control module (5). The control module (5) is electrically connected to the pressure sensor and the switching valve (4) respectively. The pressure sensor is used to detect the pressure behind the main valve. The control module (5) is used to selectively control the opening and closing of each switching valve (4) according to the pre-input time period information and target pressure value, so as to adjust the outlet pressure of the valve body (1) to reach the range of the pre-input target pressure value.

2. The pressure reducing valve with multi-stage pressure regulation according to claim 1, characterized in that, The switching valve (4) is an electromagnetic valve or an electric valve.

3. The pressure reducing valve with multi-stage pressure regulation according to claim 2, characterized in that, The switching valve (4) is a normally open power-off automatic reset valve or a normally closed power-off automatic reset valve.

4. The pressure reducing valve with multi-stage pressure regulation according to claim 1, characterized in that, An elastic member (7) is connected between the main valve flap (2) and the induction cavity (1-1), and the elastic member (7) is used to apply an elastic force towards the inlet (20) to the main valve flap (2).

5. The pressure reducing valve with multi-stage pressure regulation according to claim 4, characterized in that, The main valve flap (2) is provided with an induction channel (40), and the induction chamber (10) is communicated with the inlet (20) of the main valve through the induction channel (40).

6. The pressure reducing valve with multi-stage pressure regulation according to claim 5, characterized in that, The main valve flap (2) has an outer side facing the inlet (20) of the main valve and an inner side facing the induction chamber (10). The surface area of the inner side of the main valve flap (2) is larger than the surface area of its outer side.

7. The pressure reducing valve with multi-stage pressure regulation according to claim 5, characterized in that, A needle valve (6) is installed in the induction channel (40), and the circumferential surface of the needle valve (6) is sealingly fitted with the inner wall of the induction channel (40).

8. The pressure reducing valve with multi-stage pressure regulation according to any one of claims 1-7, characterized in that, A valve seat (8) for forming a sealing pair with the main valve flap (2) is arranged at the inlet (20) of the main valve. The valve seat (8) is circumferentially and sealingly connected to the inner wall of the valve body (1), and the main valve flap (2) is restricted in the valve body (1) by the valve seat (8).

9. The pressure reducing valve with multi-stage pressure regulation according to any one of claims 1-7, characterized in that, An installation pipe (9) is sealingly connected to the valve body (1). One end of the installation pipe (9) is connected to the induction chamber (10) by bypassing from the outside of the valve body (1), and the other end of the installation pipe (9) is connected to the pressure-reducing pilot valve branch.

10. The pressure reducing valve with multi-stage pressure regulation according to claim 9, characterized in that, The installation pipe (9) is detachably connected to the valve body (1).

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