Mud pump water sealing pipe system gate valve switching system of cutter suction dredger

Abstract

The utility model discloses a sluice valve switching system for a dredge pump water sealing pipe system of a cutter suction dredger, which comprises an underwater dredge pump, a primary dredge pump, a secondary dredge pump, a low-pressure standby water sealing pump and a high-pressure standby water sealing pump, inlet valves and outlet valves of the second-stage dredge pump suction port end low-pressure water sealing pump, the second-stage dredge pump shaft end low-pressure water sealing pump, the second-stage dredge pump suction port end high-pressure water sealing pump and the second-stage dredge pump shaft end high-pressure water sealing pump are respectively connected with water sealing bypasses in parallel; and each water sealing bypass is provided with a water sealing bypass switching valve. The low-pressure standby water sealing pump can replace other low-pressure water sealing pumps for use, and the pipelines can be switched. One high-pressure standby water sealing pump can replace other high-pressure water sealing pumps for use and switch pipelines, and the water sealing performance requirements under the conditions of long blowing distance and high pressure discharge are met; flexible selection and pipeline switching of high-pressure and low-pressure water sealing pumps of the secondary dredge pump are achieved, and the use requirement for the optimal water sealing pressure in different working condition modes is met.

Description

Technical Field

[0001] This utility model relates to the field of dredging vessel engineering technology, and in particular to a gate valve switching system for the mud pump sealing pipe system of a cutter suction dredger. Background Technology

[0002] With the continuous expansion of domestic and international dredging market demand, cutter suction dredgers, as the main dredging equipment for waterway dredging and port construction, are also developing towards larger sizes. The performance design and dredging operating system of large cutter suction dredgers are also moving towards higher levels such as intelligence, multi-condition adaptability, and long blowing distance, in response to market demand.

[0003] Among them, the mud pump, as the core equipment of a cutter suction dredger, is crucial to the efficient performance of the vessel's construction capabilities. The efficient performance and long-term use of the mud pump are inseparable from the rational design of the sealing system. Only through proper configuration and design of the sealing pump and sealing system can the mud pump be guaranteed to work normally, effectively, and continuously. Traditionally, separate sealing pumps are installed at both the suction end and shaft end of the mud pump, along with a backup sealing pump to improve the reliability of the entire sealing system. When space is limited for the sealing pump, pipelines, gate valves, etc., one or more backup sealing pumps are typically installed, with valve switching enabling their replacement. However, when there are many replacement scenarios for the backup sealing pumps, the arrangement of the sealing pipeline system and gate valves becomes very complex.

[0004] Currently, in order to meet the performance requirements of large cutter suction dredgers for long blowing distance, high discharge pressure, and multiple working conditions, higher requirements have been put forward for the system design of sealing pump layout, piping system, and gate valve. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a gate valve switching system for the sealing water pipeline of a cutter suction dredger's mud pump. By setting up a low-pressure standby sealing water pump and a low-pressure substitution switching valve, the system enables one low-pressure standby sealing water pump to replace other low-pressure sealing water pumps and allows for pipeline switching. Similarly, by setting up a high-pressure standby sealing water pump and a high-pressure substitution switching valve, the system enables one high-pressure standby sealing water pump to replace other high-pressure sealing water pumps and allows for pipeline switching, meeting the sealing performance requirements under long blowing distances and high discharge pressures. Furthermore, by setting up sealing water bypasses and sealing water bypass switching valves for the high and low pressure sealing water pumps of the secondary mud pump, the system enables flexible selection and pipeline switching of the high and low pressure sealing water pumps of the secondary mud pump, meeting the optimal sealing pressure requirements under different operating conditions.

[0006] This utility model is implemented as follows: a gate valve switching system for the mud pump sealing pipe system of a cutter suction dredger includes an underwater mud pump, a primary mud pump, and a secondary mud pump. The suction end and shaft end of the underwater mud pump are respectively equipped with an underwater mud pump suction end sealing pump and an underwater mud pump shaft end sealing pump. The suction end and shaft end of the primary mud pump are respectively equipped with a primary mud pump suction end sealing pump and a primary mud pump shaft end sealing pump. The suction end of the secondary mud pump is sequentially equipped with a secondary mud pump suction end low-pressure sealing pump and a secondary mud pump suction... The shaft ends of the secondary mud pump are sequentially equipped with a high-pressure sealing water pump at the inlet end and a low-pressure sealing water pump at the shaft end of the secondary mud pump. The inlet and outlet of each of the following pumps are respectively equipped with an inlet valve and an outlet valve: a high-pressure sealing water pump at the inlet end of the underwater mud pump, a sealing water pump at the shaft end of the underwater mud pump, a sealing water pump at the inlet end of the primary mud pump, a sealing water pump at the shaft end of the primary mud pump, a low-pressure sealing water pump at the inlet end of the secondary mud pump, a low-pressure sealing water pump at the shaft end of the secondary mud pump, a high-pressure sealing water pump at the inlet end of the secondary mud pump, and a high-pressure sealing water pump at the shaft end of the secondary mud pump.

[0007] It also includes a low-pressure standby sealing water pump and a high-pressure standby sealing water pump. The inlet and outlet of the low-pressure standby sealing water pump are respectively equipped with inlet valves and outlet valves. The outlet valve of the low-pressure standby sealing water pump is connected to the outlet valve of the underwater mud pump suction end sealing water pump, the outlet valve of the underwater mud pump shaft end sealing water pump, the outlet valve of the first-stage mud pump suction end sealing water pump, the outlet valve of the first-stage mud pump shaft end sealing water pump, the outlet valve of the second-stage mud pump suction end low-pressure sealing water pump, and the outlet valve of the second-stage mud pump shaft end low-pressure sealing water pump through a low-pressure substitution switching valve.

[0008] The inlet and outlet of the high-pressure standby sealing water pump are connected to the inlet and outlet valves of the high-pressure sealing water pump at the suction end of the secondary mud pump through the No. 1 high-pressure substitution switching valve, respectively. The inlet and outlet of the high-pressure standby sealing water pump are connected to the inlet and outlet valves of the high-pressure sealing water pump at the shaft end of the secondary mud pump through the No. 2 high-pressure substitution switching valve, respectively.

[0009] The inlet and outlet valves of the low-pressure sealing water pump at the suction end of the secondary mud pump, the inlet and outlet valves of the low-pressure sealing water pump at the shaft end of the secondary mud pump, the inlet and outlet valves of the high-pressure sealing water pump at the suction end of the secondary mud pump, and the inlet and outlet valves of the high-pressure sealing water pump at the shaft end of the secondary mud pump are all connected in parallel with sealing water bypasses, and each sealing water bypass is equipped with a sealing water bypass switching valve.

[0010] Furthermore, pressure sensors and flow sensors are installed on the shaft end sealing pipes and suction end sealing pipes of the underwater mud pump, the first-stage mud pump, and the second-stage mud pump.

[0011] Furthermore, limit switches are installed on each inlet valve, each outlet valve, each low-pressure alternative switching valve, each No. 1 high-pressure alternative switching valve, each No. 2 high-pressure alternative switching valve, and each water sealing bypass switching valve.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] 1. This utility model achieves the replacement of other low-pressure sealing pumps and pipeline switching by setting a low-pressure standby sealing water pump and a low-pressure substitution switching valve; it also achieves the replacement of other high-pressure sealing pumps and pipeline switching by setting a high-pressure standby sealing water pump and a high-pressure substitution switching valve, thus meeting the sealing performance requirements under long blowing distance and high discharge pressure.

[0014] 2. This utility model enables flexible selection and pipeline switching of the high and low pressure sealing water pumps of the secondary mud pump by setting a sealing water bypass and a sealing water bypass switching valve, thereby meeting the requirements of the pump for optimal sealing water pressure under different operating conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gate valve switching system of the mud pump sealing pipe system of the cutter suction dredger provided by this utility model.

[0016] In the diagram, 1 is the underwater mud pump; 11 is the underwater mud pump suction end sealing water pump; 12 is the underwater mud pump shaft end sealing water pump; 2 is the primary mud pump; 21 is the primary mud pump suction end sealing water pump; 22 is the primary mud pump shaft end sealing water pump; 3 is the secondary mud pump; 31 is the secondary mud pump suction end low-pressure sealing water pump; 32 is the secondary mud pump suction end high-pressure sealing water pump; 33 is the secondary mud pump shaft end low-pressure sealing water pump; 34 is the secondary mud pump shaft end high-pressure sealing water pump; 4 is the low-pressure standby sealing water pump; and 5 is the high-pressure standby sealing water pump. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example

[0021] Please see Figure 1 This utility model provides a gate valve switching system for the mud pump sealing pipe system of a cutter suction dredger. The system includes an underwater mud pump 1, a primary mud pump 2, and a secondary mud pump 3. The suction end and shaft end of the underwater mud pump 1 are respectively equipped with an underwater mud pump suction end sealing pump 11 and an underwater mud pump shaft end sealing pump 12. The suction end and shaft end of the primary mud pump 2 are respectively equipped with a primary mud pump suction end sealing pump 21 and a primary mud pump shaft end sealing pump 22. The suction end of the secondary mud pump 3 is sequentially equipped with a secondary mud pump suction end low-pressure sealing pump 31 and a secondary mud pump suction end high-pressure sealing pump 32. The shaft ends of the pressure sealing pump 32 and the secondary mud pump 3 are sequentially equipped with a secondary mud pump shaft end low-pressure sealing pump 33 and a secondary mud pump shaft end high-pressure sealing pump 34; the inlet and outlet of the underwater mud pump suction end sealing pump 11, the underwater mud pump shaft end sealing pump 12, the primary mud pump suction end sealing pump 21, the primary mud pump shaft end sealing pump 22, the secondary mud pump suction end low-pressure sealing pump 31, the secondary mud pump shaft end low-pressure sealing pump 33, the secondary mud pump suction end high-pressure sealing pump 32, and the secondary mud pump shaft end high-pressure sealing pump 34 are respectively equipped with inlet valves and outlet valves.

[0022] Specifically, the inlet and outlet of the underwater mud pump suction end sealing water pump 11 are respectively equipped with inlet valve EV11 and outlet valve EV12; the inlet and outlet of the underwater mud pump shaft end sealing water pump 12 are respectively equipped with inlet valve EV13 and outlet valve EV14; the inlet and outlet of the first-stage mud pump suction end sealing water pump 21 are respectively equipped with inlet valve EV15 and outlet valve EV16; the inlet and outlet of the first-stage mud pump shaft end sealing water pump 22 are respectively equipped with inlet valve EV17 and outlet valve EV18; the inlet and outlet of the second-stage mud pump suction end low-pressure sealing water pump 31 are respectively equipped with inlet valve EV21 and outlet valve EV22; the inlet and outlet of the second-stage mud pump shaft end low-pressure sealing water pump 33 are respectively equipped with inlet valve EV23 and outlet valve EV24; the inlet and outlet of the second-stage mud pump suction end high-pressure sealing water pump 32 are respectively equipped with inlet valve EV25 and outlet valve EV26; and the inlet and outlet of the second-stage mud pump shaft end high-pressure sealing water pump 34 are respectively equipped with inlet valve EV27 and outlet valve EV28.

[0023] The system also includes a low-pressure standby sealing water pump 4 and a high-pressure standby sealing water pump 5. The inlet and outlet of the low-pressure standby sealing water pump 4 are respectively equipped with inlet valves and outlet valves. The outlet valve of the low-pressure standby sealing water pump 4 is connected to the outlet valve of the underwater mud pump suction end sealing water pump 11, the outlet valve of the underwater mud pump shaft end sealing water pump 12, the outlet valve of the first-stage mud pump suction end sealing water pump 21, the outlet valve of the first-stage mud pump shaft end sealing water pump 22, the outlet valve of the second-stage mud pump suction end low-pressure sealing water pump 31, and the outlet valve of the second-stage mud pump shaft end low-pressure sealing water pump 33 through a low-pressure substitution switching valve.

[0024] Specifically, the low-pressure standby sealing water pump 4 is equipped with an inlet valve EV19 and an outlet valve EV20. The outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV12 of the underwater mud pump suction end sealing water pump 11 through the low-pressure substitution switching valve EV29, and is connected to the underwater mud pump 1 suction end sealing water pipe. The outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV14 of the underwater mud pump shaft end sealing water pump 12 through the low-pressure substitution switching valve EV30, and is connected to the underwater mud pump 1 shaft end sealing water pipe. The outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV16 of the first-stage mud pump suction end sealing water pump 21 through the low-pressure substitution switching valve EV31, and is connected to the first-stage mud pump 2 suction end sealing water pipe. The outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV18 of the first-stage mud pump shaft end sealing water pump 22 via the low-pressure substitution switching valve EV32, and is connected to the first-stage mud pump shaft end sealing water pipe; the outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV22 of the second-stage mud pump suction end low-pressure sealing water pump 31 via the low-pressure substitution switching valve EV33, and is connected to the inlet valve EV25 of the second-stage mud pump suction end high-pressure sealing water pump 32; the outlet valve EV20 of the low-pressure standby sealing water pump 4 is connected to the outlet valve EV24 of the second-stage mud pump shaft end low-pressure sealing water pump 33 via the low-pressure substitution switching valve EV34, and is connected to the inlet valve EV27 of the second-stage mud pump shaft end high-pressure sealing water pump 34.

[0025] The inlet and outlet of the high-pressure standby sealing water pump 5 are connected to the inlet valve and outlet valve of the high-pressure sealing water pump 32 at the suction end of the secondary mud pump through the No. 1 high-pressure substitution switching valve, respectively. The inlet and outlet of the high-pressure standby sealing water pump 5 are connected to the inlet valve and outlet valve of the high-pressure sealing water pump 34 at the shaft end of the secondary mud pump through the No. 2 high-pressure substitution switching valve, respectively.

[0026] Specifically, the inlet of the high-pressure standby sealing water pump 5 is connected to the inlet valve EV25 of the high-pressure sealing water pump 32 at the suction end of the secondary mud pump via the #1 high-pressure substitution switching valve EV35, and the outlet of the high-pressure standby sealing water pump 5 is connected to the outlet valve EV26 of the high-pressure sealing water pump 32 at the suction end of the secondary mud pump via the #1 high-pressure substitution switching valve EV36; the inlet of the high-pressure standby sealing water pump 5 is connected to the inlet valve EV27 of the high-pressure sealing water pump 34 at the shaft end of the secondary mud pump via the #2 high-pressure substitution switching valve EV37, and the inlet and outlet of the high-pressure standby sealing water pump 5 are connected to the outlet valve EV28 of the high-pressure sealing water pump 34 at the shaft end of the secondary mud pump via the #2 high-pressure substitution switching valve EV38.

[0027] The inlet and outlet valves of the low-pressure sealing water pump 31 at the suction end of the secondary mud pump, the inlet and outlet valves of the low-pressure sealing water pump 33 at the shaft end of the secondary mud pump, the inlet and outlet valves of the high-pressure sealing water pump 32 at the suction end of the secondary mud pump, and the inlet and outlet valves of the high-pressure sealing water pump 34 at the shaft end of the secondary mud pump are respectively connected in parallel with sealing water bypasses, and a sealing water bypass switching valve is provided on each sealing water bypass.

[0028] Specifically, the inlet valve EV21 and outlet valve EV22 of the low-pressure sealing water pump 31 at the suction end of the secondary mud pump are connected in parallel to the low-pressure sealing water bypass at the suction end of the secondary mud pump 3. A sealing water bypass switching valve EV39 is installed on the low-pressure sealing water bypass at the suction end of the secondary mud pump 3. The inlet valve EV23 and outlet valve EV24 of the low-pressure sealing water pump 33 at the shaft end of the secondary mud pump are connected in parallel to the low-pressure sealing water bypass at the shaft end of the secondary mud pump 3. A sealing water bypass switching valve EV4 is installed on the low-pressure sealing water bypass at the shaft end of the secondary mud pump 3. 0; The inlet valve EV25 and outlet valve EV26 of the high-pressure sealing water pump 32 at the suction end of the secondary mud pump are connected in parallel to the high-pressure sealing water bypass at the suction end of the secondary mud pump 3. A sealing water bypass switching valve EV41 is installed on the high-pressure sealing water bypass at the suction end of the secondary mud pump 3. The inlet valve EV27 and outlet valve EV28 of the high-pressure sealing water pump 34 at the shaft end of the secondary mud pump are connected in parallel to the high-pressure sealing water bypass at the shaft end of the secondary mud pump 3. A sealing water bypass switching valve EV42 is installed on the high-pressure sealing water bypass at the shaft end of the secondary mud pump 3.

[0029] Pressure sensors and flow sensors are installed on the shaft end sealing pipes and suction end sealing pipes of the underwater mud pump 1, primary mud pump 2, and secondary mud pump 3.

[0030] Limit switches are installed on each inlet valve, each outlet valve, each low-pressure alternative switching valve, each No. 1 high-pressure alternative switching valve, each No. 2 high-pressure alternative switching valve, and each water sealing bypass switching valve.

[0031] Specifically, the following valves are included: EV11 (inlet valve), EV12 (outlet valve), EV13 (inlet valve), EV14 (outlet valve), EV15 (inlet valve), EV16 (outlet valve), EV17 (inlet valve), EV18 (outlet valve), EV19 (inlet valve), EV20 (outlet valve), EV21 (inlet valve), EV22 (outlet valve), EV23 (inlet valve), EV24 (outlet valve), EV25 (inlet valve), EV26 (outlet valve), EV27 (inlet valve), EV28 (outlet valve), and EV29 (low-pressure replacement switching valve). Limit switches are installed on valves EV30, EV31, EV32, EV33, EV34, EV35, EV36, EV37, EV38, EV39, EV40, EV41, and EV42.

[0032] The specific working process of this utility model is as follows:

[0033] The mud pump sealing pipe system gate valve switching system of the cutter suction dredger of this utility model is divided into three working modes: low pressure sealing pump replacement mode, high pressure sealing pump replacement mode, and high and low pressure sealing pump switching mode of secondary mud pump 3.

[0034] The low-pressure sealing pump replacement mode is specifically divided into: low-pressure standby sealing pump 4 replacing the suction end of underwater mud pump 1, low-pressure standby sealing pump 4 replacing the shaft end of underwater mud pump 1, low-pressure standby sealing pump 4 replacing the suction end of primary mud pump 2, low-pressure standby sealing pump 4 replacing the shaft end of primary mud pump 2, low-pressure standby sealing pump 4 replacing the low-pressure suction end of secondary mud pump 3, and low-pressure standby sealing pump 4 replacing the low-pressure shaft end of secondary mud pump 3.

[0035] In this mode, during initialization, inlet valve EV11, outlet valve EV12, inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are opened, inlet valve EV19 and outlet valve EV20 are closed, and low-pressure substitution switching valves EV29, EV30, EV31, EV32, EV33, and EV34 are closed.

[0036] When the low-pressure standby sealing pump 4 replaces the suction port of the underwater mud pump 1, the following valves are opened: inlet valve EV13, outlet valve EV14, inlet valve EV15, outlet valve EV16, inlet valve EV17, outlet valve EV18, inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24; inlet valve EV19 and outlet valve EV20; low-pressure replacement switching valve EV29; and low-pressure replacement switching valves EV30, low-pressure replacement switching valve EV31, low-pressure replacement switching valve EV32, low-pressure replacement switching valve EV33, and low-pressure replacement switching valve EV34. Inlet valve EV11 and outlet valve EV12 are closed.

[0037] Similarly, the same principle applies when the low-pressure standby sealing water pump 4 replaces the shaft end of the underwater mud pump 1, when the low-pressure standby sealing water pump 4 replaces the suction end of the first-stage mud pump 2, when the low-pressure standby sealing water pump 4 replaces the shaft end of the first-stage mud pump 2, when the low-pressure standby sealing water pump 4 replaces the low-pressure suction end of the second-stage mud pump 3, and when the low-pressure standby sealing water pump 4 replaces the low-pressure shaft end of the second-stage mud pump 3.

[0038] The operation of the low-pressure sealing pump replacement mode is shown in Table 1 below:

[0039] Table 1. Operation status of the low-pressure sealing water pump alternative mode

[0040]

[0041] The high-pressure sealing pump replacement mode is specifically divided into: high-pressure standby sealing pump 5 replacing the high-pressure suction end of the secondary mud pump 3, and high-pressure standby sealing pump 5 replacing the high-pressure shaft end of the secondary mud pump 3.

[0042] In this mode, during initialization, inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28 are opened; high-pressure replacement switching valves EV35, EV36, EV37, and EV38 are closed; and water sealing bypass switching valves EV39, EV40, EV41, and EV42 are closed.

[0043] When the high-pressure standby sealing water pump 5 replaces the high-pressure suction port of the secondary mud pump 3, the inlet valve EV27 and outlet valve EV28 are opened, the #1 high-pressure replacement switching valve EV35 and #1 high-pressure replacement switching valve EV36 are opened, the inlet valve EV25 and outlet valve EV26 are closed, the #2 high-pressure replacement switching valve EV37 and #2 high-pressure replacement switching valve EV38 are closed, and the sealing water bypass switching valve EV39, sealing water bypass switching valve EV40, sealing water bypass switching valve EV41, and sealing water bypass switching valve EV42 are closed.

[0044] Similarly, the same principle applies when the high-pressure standby sealing water pump 5 replaces the high-pressure shaft end of the secondary mud pump 3.

[0045] The operation of the high-pressure sealing pump replacement mode is shown in Table 2 below:

[0046] Table 2. Operation status of the high-pressure sealing pump alternative mode

[0047]

[0048] The switching modes of the high and low pressure sealing water pumps for the secondary mud pump 3 are specifically divided into: using only the high pressure sealing water pump as the sealing water for the secondary mud pump 3, and using only the low pressure sealing water pump as the sealing water for the secondary mud pump 3.

[0049] Among them, the use of only a high-pressure sealing water pump as the secondary mud pump for sealing water can be categorized into the following situations:

[0050] When using a high-pressure sealing water pump and without a substitute, the following valves are closed: inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28; sealing water bypass switching valves EV39 and EV40; high-pressure substitute switching valves EV35, EV36, EV37, and EV38 (1# and 2#); sealing water bypass switching valves EV41 and EV42; inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24; and low-pressure substitute switching valves EV33 and EV34.

[0051] When using a high-pressure sealing water pump and with the high-pressure standby sealing water pump 5 replacing the high-pressure suction port of the secondary mud pump 3, the following valves are in operation: inlet valve EV27 and outlet valve EV28 are open; #1 high-pressure replacement switching valve EV35 and #1 high-pressure replacement switching valve EV36 are open; sealing water bypass switching valve EV39 and sealing water bypass switching valve EV40 are open; inlet valve EV25 and outlet valve EV26 are closed; #2 high-pressure replacement switching valve EV37 and #2 high-pressure replacement switching valve EV38 are closed; sealing water bypass switching valve EV41 and sealing water bypass switching valve EV42 are closed; inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are closed; and low-pressure replacement switching valve EV33 and low-pressure replacement switching valve EV34 are closed.

[0052] When using a high-pressure sealing water pump and with the high-pressure standby sealing water pump 5 replacing the high-pressure shaft end of the secondary mud pump 3, the following valves are opened: inlet valve EV25 and outlet valve EV26; #2 high-pressure replacement switching valves EV37 and EV38; sealing water bypass switching valves EV39 and EV40; inlet valve EV27 and outlet valve EV28; #1 high-pressure replacement switching valves EV35 and EV36; sealing water bypass switching valves EV41 and EV42; inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24; and low-pressure replacement switching valves EV33 and EV34.

[0053] Among them, the use of only a low-pressure sealing water pump as the secondary mud pump for sealing water can be categorized into the following situations:

[0054] When using a low-pressure sealing water pump and without a substitute, the following valves are closed: inlet valve EV21, outlet valve EV22, inlet valve EV23, and outlet valve EV24 are open; sealing water bypass switching valves EV41 and EV42 are open; sealing water bypass switching valves EV39 and EV40 are closed; low-pressure substitute switching valves EV33 and EV34 are closed; inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28 are closed; and high-pressure substitute switching valves EV35, EV36, EV37, and EV38 (both #1 and #2) are closed.

[0055] When using a low-pressure sealing water pump and with the low-pressure standby sealing water pump 4 replacing the low-pressure suction port of the secondary mud pump 3, the following valves are closed: inlet valve EV23 and outlet valve EV24 are open; sealing water bypass switching valves EV41 and EV42 are open; inlet valve EV19 and outlet valve EV20 are open; low-pressure replacement switching valve EV33 is open; low-pressure replacement switching valves EV29, EV30, EV31, EV32, and EV34 are closed; inlet valve EV21 and outlet valve EV22 are closed; sealing water bypass switching valves EV39 and EV40 are closed; inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28 are closed; and high-pressure replacement switching valves EV35, EV36, EV37, and EV38 are closed.

[0056] When using a low-pressure sealing water pump and with the low-pressure standby sealing water pump 4 replacing the low-pressure shaft end of the secondary mud pump 3, the following valves are closed: inlet valve EV21 and outlet valve EV22 are open; sealing water bypass switching valves EV41 and EV42 are open; inlet valve EV19 and outlet valve EV20 are open; low-pressure replacement switching valve EV34 is open; low-pressure replacement switching valves EV29, EV30, EV31, EV32, and EV33 are closed; inlet valve EV23 and outlet valve EV24 are closed; sealing water bypass switching valves EV39 and EV40 are closed; inlet valve EV25, outlet valve EV26, inlet valve EV27, and outlet valve EV28 are closed; and high-pressure replacement switching valves EV35, EV36, EV37, and EV38 are closed.

[0057] The operation of the high and low pressure sealing water pump switching mode of the secondary mud pump 3 is shown in Table 3 below:

[0058] Table 3. Operation status of the high and low pressure sealing water pump switching mode of the secondary mud pump 3.

[0059]

[0060] This invention achieves the substitution of one low-pressure backup sealing water pump 4 for other low-pressure sealing water pumps and pipeline switching by setting up a low-pressure backup sealing water pump 4 and a low-pressure substitution switching valve; it also achieves the substitution of one high-pressure backup sealing water pump 5 for other high-pressure sealing water pumps and pipeline switching by setting up a high-pressure backup sealing water pump 5, thus meeting the sealing performance requirements under long blowing distance and high discharge pressure; and by setting up a sealing water bypass and a sealing water bypass switching valve for the high and low pressure sealing water pumps of the secondary mud pump 3, it achieves flexible selection of the high and low pressure sealing water pumps of the secondary mud pump and pipeline switching, thus meeting the requirements for optimal sealing water pressure under different operating conditions.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gate valve switching system for the mud pump sealing pipe system of a cutter suction dredger, characterized in that: It includes an underwater mud pump, a primary mud pump, and a secondary mud pump. The suction end and shaft end of the underwater mud pump are respectively equipped with an underwater mud pump suction end sealing water pump and an underwater mud pump shaft end sealing water pump. The suction end and shaft end of the primary mud pump are respectively equipped with a primary mud pump suction end sealing water pump and a primary mud pump shaft end sealing water pump. The suction end of the secondary mud pump is sequentially equipped with a secondary mud pump suction end low-pressure sealing water pump and a secondary mud pump suction end high-pressure sealing water pump. The shaft end of the secondary mud pump is sequentially equipped with a secondary mud pump shaft end low-pressure sealing water pump and a secondary mud pump shaft end high-pressure sealing water pump. Each of the underwater mud pump suction end sealing water pump, the underwater mud pump shaft end sealing water pump, the primary mud pump suction end sealing water pump, the primary mud pump shaft end sealing water pump, the secondary mud pump suction end low-pressure sealing water pump, the secondary mud pump shaft end low-pressure sealing water pump, the secondary mud pump suction end high-pressure sealing water pump, and the secondary mud pump shaft end high-pressure sealing water pump is respectively equipped with an inlet valve and an outlet valve. It also includes a low-pressure standby sealing water pump and a high-pressure standby sealing water pump. The inlet and outlet of the low-pressure standby sealing water pump are respectively equipped with inlet valves and outlet valves. The outlet valve of the low-pressure standby sealing water pump is connected to the outlet valves of the underwater mud pump suction end sealing water pump, the underwater mud pump shaft end sealing water pump, the first-stage mud pump suction end sealing water pump, the first-stage mud pump shaft end sealing water pump, the second-stage mud pump suction end low-pressure sealing water pump, and the second-stage mud pump shaft end low-pressure sealing water pump through a low-pressure substitution switching valve. The inlet and outlet of the high-pressure standby sealing water pump are connected to the inlet and outlet valves of the high-pressure sealing water pump at the suction end of the secondary mud pump through the No. 1 high-pressure substitution switching valve, respectively. The inlet and outlet of the high-pressure standby sealing water pump are connected to the inlet and outlet valves of the high-pressure sealing water pump at the shaft end of the secondary mud pump through the No. 2 high-pressure substitution switching valve, respectively. The inlet valves and outlet valves of the two-stage mud pump suction end low-pressure sealing water pump, the two-stage mud pump shaft end low-pressure sealing water pump, the two-stage mud pump suction end high-pressure sealing water pump, and the two-stage mud pump shaft end high-pressure sealing water pump are respectively connected in parallel with sealing water bypasses, and each sealing water bypass is equipped with a sealing water bypass switching valve.

2. The gate valve switching system for the mud pump sealing pipe system of the cutter suction dredger according to claim 1, characterized in that, Pressure sensors and flow sensors are installed on the shaft end sealing pipes and suction end sealing pipes of the underwater mud pump, primary mud pump, and secondary mud pump.

3. The gate valve switching system for the mud pump sealing pipe system of the cutter suction dredger according to claim 1, characterized in that, Limit switches are installed on each inlet valve, each outlet valve, each low-pressure alternative switching valve, each No. 1 high-pressure alternative switching valve, each No. 2 high-pressure alternative switching valve, and each water sealing bypass switching valve.

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