A pressure control module and method that decouples supply and return water isolation and pressure safety

Abstract

The present disclosure relates to a pressure control module (100) for achieving supply and return water isolation and pressure safety decoupling of a water circulation system (1), wherein the water circulation system (1) comprises a source side circulation (2), a load side circulation (3), a return water shut-off valve (31) and a supply water shut-off valve (32). The pressure control module (100) is configured to achieve supply and return water isolation by continuously regulating the at least one source side variable speed circulation pump (6) and / or the at least one load side variable speed circulation pump (7) in a closed loop manner based on a set opening differential pressure (ΔP_setpoint) of a source side bidirectional differential pressure bypass component (10) and a load side bidirectional differential pressure bypass component (11) such that an absolute value of a calculated feedback differential pressure (ΔP_feedback) is less than the set opening differential pressure (ΔP_setpoint). The pressure control module (100) is further configured to monitor for a failure shutdown of the source side variable speed circulation pump (6) and / or the load side variable speed circulation pump (7) and to quickly close the return water shut-off valve (31) and the supply water shut-off valve (32) to achieve pressure safety decoupling of the source side circulation (2) and the load side circulation (3).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a control module and method for implementing supply and return water isolation and pressure safety decoupling of a water circulation system, which is particularly suitable for supply and return water isolation and pressure safety decoupling of a central heating long-distance pipeline system. BACKGROUND

[0002] In a water circulation system, either sudden stop of a water pump causes serious water hammer damage to a large flow long-distance pipeline, or there are pipes or equipment with different pressure-bearing grades, or there is a large difference in elevation between different regions in the system, which makes the local region of the water circulation system have the risk of overpressure or potential overpressure. To meet the safety requirements, the skilled person in the art usually uses a heat exchanger to completely physically isolate the water system to solve the safety problem. However, the solution using the heat exchanger has negative effects such as large initial investment, large floor area, large temperature loss, reduced pipeline distribution and supply capacity, reduced energy efficiency of cold and heat sources, increased heat loss, and increased operating costs. The skilled person in the art also tries to use a bypass pipe or a decoupling tank to achieve hydraulic decoupling, but cannot avoid water hammer and static pressure overpressure caused by sudden stop of the circulating pump, cannot solve the safety problem, and the supply water and return water will mix through the bypass pipe or the decoupling tank, causing energy efficiency to decrease. SUMMARY

[0003] The pressure control module and method of the water circulation system according to the present disclosure provide an effective and safe solution to avoid mixing of supply and return water and to achieve pressure safety decoupling. When the source-side circulating pump and / or the load-side circulating pump suddenly stops, the pressure control module and method disclosed herein can isolate the supply and return water to prevent mixing of the supply and return water, and can completely isolate the source-side circulation and the load-side circulation to avoid water hammer conduction to the other side of the circulation and to prevent water hammer damage to the part with weak pressure-bearing capacity in the system.

[0004] According to a first aspect of the present disclosure, there is provided a pressure control module for implementing supply and return water isolation and pressure safety decoupling of a water circulation system, wherein the water circulation system comprises:

[0005] a source-side circulation having at least one source component, a source-side supply water interface, a source-side return water interface, a source-side bidirectional differential pressure bypass component connected to the source-side supply water interface and the source-side return water interface, and at least one source-side variable speed circulating pump,

[0006] a load-side circulation having at least one load component, a load-side supply water interface, a load-side return water interface, a load-side bidirectional differential pressure bypass component connected to the load-side supply water interface and the load-side return water interface, and at least one load-side variable speed circulating pump,

[0007] -- a return water shutoff valve connected with the source-side return water interface and the load-side return water interface, and

[0008] -- a supply water shutoff valve connected with the source-side supply water interface and the load-side supply water interface.

[0009] The pressure control module is configured to, in normal operation, based on a set opening pressure difference (ΔP_setpoint), continuously adjust the at least one source-side variable speed circulating pump and / or at least one load-side variable speed circulating pump in a closed loop manner to achieve the following purposes: (a) the absolute value of a calculated feedback pressure difference (ΔP_feedback) is less than the set opening pressure difference (ΔP_setpoint),

[0010] (b) the source-side and load-side bidirectional pressure difference bypass components remain in a closed state,

[0011] (c) supply and return water isolation, the set opening pressure difference (ΔP_setpoint) is the minimum pressure difference that turns on the source-side and load-side bidirectional pressure difference bypass components, the calculated feedback pressure difference (ΔP_feedback) is the pressure difference with the largest absolute value between the source-side supply and return water pressure difference (ΔP1) and the load-side supply and return water pressure difference (ΔP2), the source-side supply and return water pressure difference (ΔP1) is the difference between the pressure Ps1 of the source-side supply water interface and the pressure Pr1 of the source-side return water interface, the load-side supply and return water pressure difference (ΔP2) is the difference between the pressure Ps2 of the load-side supply water interface and the pressure Pr2 of the load-side return water interface, the set opening pressure difference (ΔP_setpoint) is preferably 5 kPa to 200 kPa, more preferably 10 kPa to 100 kPa,

[0012] When a failure of the source-side and / or load-side variable speed circulating pump is detected, the return water shutoff valve and the supply water shutoff valve are quickly closed to achieve pressure safety decoupling of the source-side and load-side circulations. The closing time of the return water shutoff valve and the supply water shutoff valve is preferably not more than 30 seconds, more preferably not more than 15 seconds.

[0013] The water circulation system can be a heating, cooling or cooling system. The source component can be a boiler, heat pump, refrigerator, heat exchanger, or a combination thereof, for producing or converting cold or heat, and the cold or heat produced by the source component is carried by water, and the water carrying the cold or heat (referred to as "cold water or hot water" for short) is provided to the source side circulation by the source side variable speed circulating pump. The load side of the water circulation system consumes cold or heat, and the cold water or hot water provided by the source circulation is delivered to the load side circulation by the load side variable speed circulating pump, and the cold or heat is provided to the space or object needing heating or cooling by the load component, which can be a heat exchanger, radiator, radiant heating coil, air heating coil, air cooling coil, radiant cooling coil, etc. When the source side circulation and the load side circulation have different pressure levels, a pressure reducing valve can be provided in the source side circulation and / or the load side circulation to achieve the required working pressure of the source side and the load side respectively. The source side bidirectional differential pressure bypass component and the load side bidirectional differential pressure bypass component can be composed of two groups of check valves in reverse parallel combination, and the opening pressure of the check valves is set to the same value. The water supply shut-off valve and the return water shut-off valve are electric or pneumatic on-off valves, preferably electric or pneumatic butterfly valves.

[0014] Optionally, the pressure control module is configured to: if the calculated feedback pressure difference (ΔP_feedback) is greater than or equal to the set opening pressure difference (ΔP1_setpoint), reduce the speed of the source side variable speed circulating pump; if the speed of the source side variable speed circulating pump reaches the lower limit, the calculated feedback pressure difference (ΔP_feedback) is still greater than or equal to the set opening pressure difference (ΔP1_setpoint), increase the speed of the load side variable speed circulating pump; if the speed of the load side variable speed circulating pump reaches the upper limit, the calculated feedback pressure difference (ΔP_feedback) is still greater than or equal to the set opening pressure difference (ΔP1_setpoint), and one or more source side variable speed circulating pumps are stopped.

[0015] Optionally, the pressure control module is configured to: if the calculated feedback pressure difference (ΔP_feedback) is greater than or equal to the set opening pressure difference (ΔP1_setpoint), increase the speed of the load side variable speed circulating pump; if the speed of the load side variable speed circulating pump reaches the upper limit, the calculated feedback pressure difference (ΔP_feedback) is still greater than or equal to the set opening pressure difference (ΔP1_setpoint), reduce the speed of the source side variable speed circulating pump; if the speed of the source side variable speed circulating pump reaches the lower limit, the calculated feedback pressure difference (ΔP_feedback) is still greater than or equal to the set opening pressure difference (ΔP1_setpoint), and one or more source side variable speed circulating pumps are stopped.

[0016] Optionally, the pressure control module is configured to: if the calculated feedback pressure difference (ΔP_feedback) is less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), increase the speed of the source-side variable speed circulating pump; if the speed of the source-side variable speed circulating pump reaches an upper limit and the calculated feedback pressure difference (ΔP_feedback) is still less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), decrease the speed of the load-side variable speed circulating pump; and if the speed of the load-side variable speed circulating pump reaches a lower limit and the calculated feedback pressure difference (ΔP_feedback) is still less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), shut down one or more of the load-side variable speed circulating pumps.

[0017] Optionally, the pressure control module is configured to: if the calculated feedback pressure difference (ΔP_feedback) is less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), decrease the speed of the load-side variable speed circulating pump; if the speed of the load-side variable speed circulating pump reaches a lower limit and the calculated feedback pressure difference (ΔP_feedback) is still less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), increase the speed of the source-side variable speed circulating pump; and if the speed of the source-side variable speed circulating pump reaches an upper limit and the calculated feedback pressure difference (ΔP_feedback) is still less than or equal to the negated setpoint opening pressure difference (-ΔP1_setpoint), shut down one or more of the load-side variable speed circulating pumps.

[0018] According to a second aspect of the present disclosure, there is provided a water circulation system, comprising:

[0019] a source-side circulation having at least one source component, a source-side water supply interface, a source-side water return interface, a source-side bidirectional differential pressure bypass component connected to the source-side water supply interface and the source-side water return interface, and at least one source-side variable speed circulating pump,

[0020] a load-side circulation having at least one load component, a load-side water supply interface, a load-side water return interface, a load-side bidirectional differential pressure bypass component connected to the load-side water supply interface and the load-side water return interface, and at least one load-side variable speed circulating pump,

[0021] a water return shutoff valve connected to the source-side water return interface and the load-side water return interface,

[0022] a water supply shutoff valve connected to the source-side water supply interface and the load-side water supply interface,

[0023] -- four pressure sensors, wherein a first pressure sensor is arranged at the source-side water supply interface to monitor the pressure Ps1 of the source-side water supply interface, a second pressure sensor is arranged at the source-side water return interface to monitor the pressure Pr1 of the source-side water return interface, a third pressure sensor is arranged at the load-side water supply interface to monitor the pressure Ps2 of the load-side water supply interface, and a fourth pressure sensor is arranged at the load-side water return interface to monitor the pressure Pr2 of the load-side water return interface, and

[0024] -- a pressure control module as disclosed herein.

[0025] Optionally, the source-side variable speed circulating pump is arranged on the water return of the source-side circulation, the load-side variable speed circulating pump is arranged on the water supply of the load-side circulation, and when the working pressures of the source-side circulation and the load-side circulation are different, a pressure reducing valve can be arranged on the water supply of the source-side circulation and / or the water return of the load-side circulation to achieve the required working pressures of the source-side and the load-side respectively.

[0026] Optionally, the source-side variable speed circulating pump is arranged on the water return of the source-side circulation, the load-side variable speed circulating pump is arranged on the water supply of the load-side circulation, and when the working pressures of the source-side circulation and the load-side circulation are different, a pressure reducing valve can be arranged on the water supply of the source-side circulation and / or the water return of the load-side circulation to achieve the required working pressures of the source-side and the load-side respectively.

[0027] Optionally, the source-side variable speed circulating pump is arranged on the water supply of the source-side circulation, the load-side variable speed circulating pump is arranged on the water supply of the load-side circulation, and when the working pressures of the source-side circulation and the load-side circulation are different, a pressure reducing valve can be arranged on the water return of the source-side circulation and / or the water return of the load-side circulation to achieve the required working pressures of the source-side and the load-side respectively.

[0028] Optionally, the source-side variable speed circulating pump is arranged on the water supply of the source-side circulation, the load-side variable speed circulating pump is arranged on the water return of the load-side circulation, and when the working pressures of the source-side circulation and the load-side circulation are different, a pressure reducing valve can be arranged on the water return of the source-side circulation and / or the water supply of the load-side circulation to achieve the required working pressures of the source-side and the load-side respectively.

[0029] Optionally, the source-side bidirectional differential pressure bypass component and the load-side bidirectional differential pressure bypass component can be reverse parallel combination of two groups of check valves with settable opening pressures, and the opening pressures of the check valves are set to the same value.

[0030] Optionally, the water supply shut-off valve and the water return shut-off valve are electrically or pneumatically operated on-off valves, preferably electrically or pneumatically operated butterfly valves, and most preferably pneumatically operated butterfly valves.

[0031] According to a third aspect of the present disclosure, a method for achieving water supply and return isolation and pressure safety decoupling of a water circulation system is provided, wherein the water circulation system comprises:

[0032] --Source-side circulation, the source-side circulation having at least one source component, a source-side water supply interface, a source-side return interface, a source-side bidirectional differential pressure bypass component connected to the source-side water supply interface and the source-side return interface, and at least one source-side variable speed circulation pump.

[0033] --Load-side circulation, the load-side circulation having at least one load component, a load-side water supply interface, a load-side return water interface, a load-side bidirectional differential pressure bypass component connected to the load-side water supply interface and the load-side return water interface, and at least one load-side variable speed circulation pump.

[0034] --Return water shut-off valve, which is connected to the source-side return water interface and the load-side return water interface.

[0035] --Water supply shut-off valve, which is connected to the source-side water supply interface and the load-side water supply interface, and

[0036] --As disclosed in this article, the pressure control module.

[0037] The method includes: during normal operation, based on a set opening differential pressure (ΔP_setpoint), continuously adjusting at least one source-side variable-speed circulating pump and / or at least one load-side variable-speed circulating pump in a closed-loop manner to achieve the following objectives: (a) the absolute value of the calculated feedback differential pressure (ΔP_feedback) is less than the set opening differential pressure (ΔP_setpoint); (b) the source-side bidirectional differential pressure bypass component and the load-side bidirectional differential pressure bypass component remain closed; and (c) supply and return water are isolated, wherein the set opening differential pressure (ΔP_setpoint) is such that the source-side bidirectional differential pressure bypass component and the load-side... The minimum differential pressure at which the bidirectional differential pressure bypass component is activated is defined as follows: the calculated feedback differential pressure (ΔP_feedback) is the differential pressure with the largest absolute value among the source-side supply and return water differential pressure (ΔP1) and the load-side supply and return water differential pressure (ΔP2). The source-side supply and return water differential pressure (ΔP1) is the difference between the pressure Ps1 at the source-side supply interface and the pressure Pr1 at the source-side return interface. The load-side supply and return water differential pressure (ΔP2) is the difference between the pressure Ps2 at the load-side supply interface and the pressure Pr2 at the load-side return interface. The set opening differential pressure (ΔP_setpoint) is preferably 5 kPa to 200 kPa, more preferably 10 kPa to 100 kPa.

[0038] When a sudden shutdown of the source-side variable-speed circulating pump and / or the load-side variable-speed circulating pump is detected, the return water shut-off valve and the supply water shut-off valve should be quickly closed to achieve pressure safety decoupling between the source-side circulation and the load-side circulation. The closing time of the return water shut-off valve and the supply water shut-off valve should preferably not exceed 30 seconds, and more preferably not exceed 15 seconds. Attached Figure Description

[0039] Embodiments of the present disclosure will now be described by way of example with reference to the following drawings:

[0040] Figure 1 shows a schematic diagram of an example of an embodiment of a water circulation system according to the present disclosure,

[0041] Figure 2 shows a schematic diagram of an example of another embodiment of a water circulation system according to the present disclosure,

[0042] Figure 3 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0043] Figure 4 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0044] Figure 5 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0045] Figure 6 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0046] Figure 7 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0047] Figure 8 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0048] Figure 9 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0049] Figure 10 shows a schematic diagram of an example of yet another embodiment of a water circulation system according to the present disclosure,

[0050] Figure 11 shows a schematic diagram of an example of a control method for water supply and return isolation and pressure safety decoupling of a water circulation system according to the present disclosure. DETAILED DESCRIPTION

[0051] Figure 1A water circulation system 1 with a source side circulation 2 and a load side circulation 3 is shown. The water circulation system 1 can be a heating, cooling or cooling system. The source side circulation 2 comprises a source element 4, which can be a boiler, a heat pump, a refrigerator, a heat exchanger, or a combination thereof, for producing or converting cold or heat, the cold or heat produced by the source element 4 is carried by water, which is driven by a source side variable speed circulation pump 6 connected to a source side circulation return water interface 18 to drive a source side water circulation, to provide the water carrying cold or heat (referred to as "cold or hot water" hereinafter) to the source side circulation 2, the source side circulation 2 further comprises a source side bidirectional differential pressure bypass element 10 connected to a source side water supply interface 16 and the source side circulation return water interface 18. The load side circulation 3 comprises a load element 5, which can be a heat exchanger, a radiator, a radiant heating coil, an air heating coil, an air cooling coil, a radiant cooling coil, etc., for consuming the cold or heat from the source side, which is driven by a load side variable speed circulation pump 7 connected to a load side circulation return water interface 19 to drive a load side water circulation, to deliver the cold or hot water provided by the source circulation 2 to the load side circulation 3, to provide the cold or heat to a space or object requiring heating or cooling by the load element 5, the load side circulation 3 further comprises a load side bidirectional differential pressure bypass element 11 connected to a load side water supply interface 17 and the load side circulation return water interface 19. The source side bidirectional differential pressure bypass element 10 and the load side bidirectional differential pressure bypass element 11 can be composed of two groups of check valves in reverse parallel combination, the opening pressure of the check valves is set to the same value.

[0052] The water circulation system 1 further comprises a return water shut-off valve 31 and a water supply shut-off valve 32 between the source side circulation 2 and the load side circulation 3, the return water shut-off valve 31 is connected to the source side circulation return water interface 18 and the load side circulation return water interface 19, the water supply shut-off valve 32 is connected to the source side water supply interface 16 and the load side water supply interface 17. The return water shut-off valve 31 and the water supply shut-off valve 32 are electrically or pneumatically operated on-off valves, preferably electrically or pneumatically operated butterfly valves.

[0053] The water circulation system 1 further comprises four pressure sensors, a first pressure sensor 14 arranged at the source side water supply interface 16 to monitor the pressure Ps1 of the source side water supply interface, a second pressure sensor 12 arranged at the source side circulation return water interface 18 to monitor the pressure Pr1 of the source side circulation return water interface, a third pressure sensor 15 arranged at the load side water supply interface 17 to monitor the pressure Ps2 of the load side water supply interface, and a fourth pressure sensor 13 arranged at the load side circulation return water interface 19 to monitor the pressure Pr2 of the load side circulation return water interface.

[0054] In normal operation, the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11 are in a closed state, and the backwater shutoff valve 31 and the water supply shutoff valve 32 are in an open state, so that the flow is not allowed to flow through the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11, and the supply water and backwater are prevented from being mixed. When the source-side variable speed circulating pump 6 and / or the load-side variable speed circulating pump 7 suddenly stops due to a fault, the backwater shutoff valve 31 and the water supply shutoff valve 32 are closed. If the differential pressure between the two ends of the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11 is greater than the opening differential pressure of the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11, the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11 are in an open state, the flow is allowed to flow through the source-side bidirectional differential pressure bypass component 10 and the load-side bidirectional differential pressure bypass component 11, the pressure safety decoupling is realized, and the water hammer damage is prevented.

[0055] To avoid the mixing of the supply water and backwater of the water circulation system 1 in normal operation, and to realize the pressure safety decoupling when the source-side variable speed circulating pump 6 and / or the load-side variable speed circulating pump 7 stops due to a fault, the water circulation system 1 further includes a pressure control module 100. The pressure control module 100 is configured to be connected with the first pressure sensor 14 through a wired or wireless signal channel 114 and continuously monitor the pressure Ps1 of the source-side water supply interface 16, be connected with the second pressure sensor 12 through a wired or wireless signal channel 112 and continuously monitor the pressure Pr1 of the source-side backwater interface 18, be connected with the third pressure sensor 15 through a wired or wireless signal channel 115 and continuously monitor the pressure Ps2 of the load-side water supply interface 17, be connected with the fourth pressure sensor 13 through a wired or wireless signal channel 113 and continuously monitor the pressure Pr2 of the load-side backwater interface 19, be connected with the source-side variable speed circulating pump 6 through a wired or wireless signal channel 106 and continuously monitor and adjust the source-side variable speed circulating pump 6, and be connected with the load-side variable speed circulating pump 7 through a wired or wireless signal channel 107 and continuously monitor and adjust the load-side variable speed circulating pump 7.

[0056] In normal operation, the pressure control module 100 is configured to keep the source-side and load-side bidirectional differential pressure bypass components 10 and 11 in a closed state, isolating the water supply and return, by continuously adjusting the at least one source-side variable speed circulating pump 6 and / or the at least one load-side variable speed circulating pump 7 in a closed-loop manner to keep the absolute value of a calculated feedback differential pressure (ΔP_feedback) less than a set opening differential pressure (ΔP_setpoint), which is the minimum differential pressure for turning on the source-side and load-side bidirectional differential pressure bypass components 10 and 11, and the calculated feedback differential pressure (ΔP_feedback) is the differential pressure with the largest absolute value between a source-side water supply and return differential pressure (ΔP1) and a load-side water supply and return differential pressure (ΔP2), the source-side water supply and return differential pressure (ΔP1) is the difference between the pressure Ps1 of the source-side water supply interface 16 and the pressure Pr1 of the source-side water return interface 18, and the load-side water supply and return differential pressure (ΔP2) is the difference between the pressure Ps2 of the load-side water supply interface 17 and the pressure Pr2 of the load-side water return interface 19, the set opening differential pressure (ΔP_setpoint) is preferably 5 kPa to 200 kPa, and more preferably 10 kPa to 100 kPa.

[0057] If the calculated feedback differential pressure (ΔP_feedback) is greater than or equal to the set opening differential pressure (ΔP1_setpoint), the speed of the source-side variable speed circulating pump 6 is reduced; if the calculated feedback differential pressure (ΔP_feedback) is still greater than or equal to the set opening differential pressure (ΔP1_setpoint) when the speed of the source-side variable speed circulating pump 6 reaches the lower limit, the speed of the load-side variable speed circulating pump 7 is increased; if the calculated feedback differential pressure (ΔP_feedback) is still greater than or equal to the set opening differential pressure (ΔP1_setpoint) when the speed of the load-side variable speed circulating pump 7 reaches the upper limit, one or more of the source-side variable speed circulating pumps 6 are shut down.

[0058] If the calculated feedback differential pressure (ΔP_feedback) is less than or equal to the negated set opening differential pressure (-ΔP1_setpoint), the speed of the source-side variable speed circulating pump 6 is increased; if the calculated feedback differential pressure (ΔP_feedback) is still less than or equal to the negated set opening differential pressure (-ΔP1_setpoint) when the speed of the source-side variable speed circulating pump 6 reaches the upper limit, the speed of the load-side variable speed circulating pump 7 is reduced; if the calculated feedback differential pressure (ΔP_feedback) is still less than or equal to the negated set opening differential pressure (-ΔP1_setpoint) when the speed of the load-side variable speed circulating pump 7 reaches the lower limit, one or more of the load-side variable speed circulating pumps 7 are shut down.

[0059] When the pressure control module 100 monitors that the source side variable speed circulating pump and / or the load side variable speed circulating pump has a failure shutdown, the safety decoupling control module 100 quickly closes the return water shutoff valve 31 and the supply water shutoff valve 32, so that the source side circulation 2 and the load side circulation 3 achieve pressure safety decoupling. The closing time of the return water shutoff valve 31 and the supply water shutoff valve 32 is preferably not more than 30 seconds, more preferably not more than 15 seconds.

[0060] Figure 2 An embodiment of reducing the pressure of the load side circulation 3 is shown. The first pressure reducing valve 8 is connected to the source side supply water interface 16 to reduce the pressure of the load side circulation 3. In addition to being configured according to the embodiment, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source side supply water interface 16 and the monitored pressure Ps1 of the source side supply water interface 16, so that ΔPs1 approaches 0 Pa. Figure 1 An embodiment of reducing the pressure of the load side circulation 3 is shown. The first pressure reducing valve 8 is connected to the source side supply water interface 16 to reduce the pressure of the load side circulation 3. In addition to being configured according to the embodiment, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source side supply water interface 16 and the monitored pressure Ps1 of the source side supply water interface 16, so that ΔPs1 approaches 0 Pa.

[0061] Figure 3 An embodiment of reducing the pressure of the load side circulation 3 is shown. The first pressure reducing valve 8 is connected to the source side supply water interface 16 to reduce the pressure of the load side circulation 3. In addition to being configured according to the embodiment, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source side supply water interface 16 and the monitored pressure Ps1 of the source side supply water interface 16, so that ΔPs1 approaches 0 Pa. Figure 1 An embodiment of reducing the pressure of the load side circulation 3 is shown. The first pressure reducing valve 8 is connected to the source side supply water interface 16 to reduce the pressure of the load side circulation 3. In addition to being configured according to the embodiment, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source side supply water interface 16 and the monitored pressure Ps1 of the source side supply water interface 16, so that ΔPs1 approaches 0 Pa.

[0062] Figure 4 An embodiment of reducing the pressure of the load side circulation 3 is shown. The first pressure reducing valve 8 is connected to the source side supply water interface 16 to reduce the pressure of the load side circulation 3. In addition to being configured according to the embodiment, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source side supply water interface 16 and the monitored pressure Ps1 of the source side supply water interface 16, so that ΔPs1 approaches 0 Pa. Figure 1In addition to the embodiment configuration, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source-side water supply interface 16 and the monitored pressure Ps1 of the source-side water supply interface 16, so that ΔPs1 approaches 0 Pa.

[0063] Figure 5 Another embodiment is shown to reduce the pressure of the load-side circulation 3. The first pressure reducing valve 8 is connected to the source-side water supply interface 16 to reduce the pressure of the load-side circulation 3, and the load-side variable circulation pump 7 is connected to the load component water supply interface 23. The pressure control module 100 is configured to Figure 1 In addition to the embodiment configuration, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source-side water supply interface 16 and the monitored pressure Ps1 of the source-side water supply interface 16, so that ΔPs1 approaches 0 Pa.

[0064] Figure 6 An embodiment is shown to reduce the pressure of the source component 4. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, and the load-side variable circulation pump 7 is connected to the load component water supply interface 23. The pressure control module 100 is configured to Figure 1 In addition to the embodiment configuration, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source-side water supply interface 16 and the monitored pressure Ps1 of the source-side water supply interface 16, so that ΔPs1 approaches 0 Pa.

[0065] Figure 7 Another embodiment is shown to reduce the pressure of the source component 4. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, and the load-side variable circulation pump 7 is connected to the load component water supply interface 23. The source component return water interface 24 is connected to the first pressure reducing valve 8 to reduce the pressure of the source component 4, and the sixth pressure sensor 20 is installed at the source component return water interface 24 to monitor the pressure Pr3 at the source component return water interface 24. The pressure control module 100 is configured to Figure 1 In addition to the embodiment configuration, the pressure control module 100 is further configured to continuously regulate the first pressure reducing valve 8 based on the difference ΔPs1 between the given pressure Ps1_setpoint of the source-side water supply interface 16 and the monitored pressure Ps1 of the source-side water supply interface 16, so that ΔPs1 approaches 0 Pa.

[0066] Figure 8An embodiment is shown to reduce the pressure of the source-side circulation 2. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, and the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19 to reduce the pressure of the source-side circulation 2. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa. Figure 1 An embodiment is shown to reduce the pressure of the source-side circulation 2. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, and the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19 to reduce the pressure of the source-side circulation 2. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa.

[0067] Figure 9 An embodiment is shown to reduce the pressure of the source-side circulation 2 and the source component 4. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19, and the first pressure reducing valve 8 is connected to the source component water return interface 24 to reduce the pressure of the source-side circulation 2 and the source component 4. The sixth pressure sensor 20 is installed at the source component water return interface 24 to monitor the pressure at the source component water return interface 24. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa. The pressure control module 100 is further configured to be connected to the sixth pressure sensor 20 through the wired or wireless signal channel 120 and continuously monitor the pressure Pr3 of the source component water return interface 24, continuously regulate the first pressure reducing valve 8 based on the difference ΔPr3 between the given pressure Pr3_setpoint of the source component water return interface 24 and the monitored pressure Pr3 of the source component water return interface 24, so that ΔPr3 approaches 0 Pa. Figure 1 An embodiment is shown to reduce the pressure of the source-side circulation 2. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, and the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19 to reduce the pressure of the source-side circulation 2. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa.

[0068] Figure 10 An embodiment is shown to reduce the pressure of the source-side circulation 2. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, and the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19 to reduce the pressure of the source-side circulation 2. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa. Figure 1 An embodiment is shown to reduce the pressure of the source-side circulation 2. The source-side variable circulation pump 6 is connected to the source-side circulation water supply interface 16, the load-side variable circulation pump 7 is connected to the load component water supply interface 23, and the second pressure reducing valve 9 is connected to the load-side circulation water return interface 19 to reduce the pressure of the source-side circulation 2. The pressure control module 100 is configured to, in addition to the embodiment configuration, continuously regulate the second pressure reducing valve 9 based on the difference ΔPr2 between the given pressure Pr2_setpoint of the load-side circulation water return interface 19 and the monitored pressure Pr2 of the load-side circulation water return interface 19, so that ΔPr2 approaches 0 Pa.

[0069] Figure 11An example of the method for realizing the supply and return water isolation and pressure safety decoupling in the water circulation system 1 is shown, in which the source side variable speed circulation pump 6 and the load side variable speed circulation pump 7 are both controlled by the pressure control module 100. The control module 100 controls the start of the source side variable speed circulation pump 6 and the load side variable speed circulation pump 7, starts (step 10001) the water circulation system 1, and reaches the initial flow rate and pressure.

[0070] After the water circulation system 1 is started, the pressure control module 100 continuously monitors the running state of the source side variable speed circulation pump 6 and the load side variable speed circulation pump 7, checks (step 10002) whether the source side variable speed circulation pump 6 and / or the load side variable speed circulation pump 7 is faulted and stopped, and if the source side variable speed circulation pump 6 and / or the load side variable speed circulation pump 7 is faulted and stopped, quickly closes the return water cut-off valve 31 and the supply water cut-off valve 32 (step 10003), so that the source side circulation 2 and the load side circulation 3 realize pressure safety decoupling, and the system is shut down.

[0071] If the source side variable speed circulation pump 6 and the load side variable speed circulation pump 7 are not faulted and stopped, it is judged (step 10004) whether the calculated feedback pressure difference (ΔP_feedback) is greater than or equal to the set opening pressure difference (ΔP_setpoint). The set opening pressure difference (ΔP_setpoint) is the minimum pressure difference for the source side bidirectional pressure difference bypass component 10 and the load side bidirectional pressure difference bypass component 11 to be turned on, the calculated feedback pressure difference (ΔP_feedback) is the pressure difference value with the largest absolute value in the source side supply and return water pressure difference (ΔP1) and the load side supply and return water pressure difference (ΔP2), the source side supply and return water pressure difference (ΔP1) is the difference between the pressure Ps1 of the source side supply water interface 16 and the pressure Pr1 of the source side return water interface 18, and the load side supply and return water pressure difference (ΔP2) is the difference between the pressure Ps2 of the load side supply water interface 17 and the pressure Pr2 of the load side return water interface 19.

[0072] If the calculated feedback pressure difference (ΔP_feedback) is greater than or equal to the set point opening pressure difference (ΔP1_setpoint), it is determined (step 10007) whether the rotational speed of the source side variable speed circulating pump 6 has reached the lower limit, and if the rotational speed of the source side variable speed circulating pump 6 has not reached the lower limit, the rotational speed of the source side variable speed circulating pump 6 is decreased (step 10006), and the decrease value of the rotational speed of the source side variable speed circulating pump 6 is calculated using a PID algorithm known to those skilled in the art, and the process returns to step 10002. If the rotational speed of the source side variable speed circulating pump 6 has reached the lower limit, it is determined (step 10012) whether the rotational speed of the load side variable speed circulating pump 7 has reached the upper limit, and if the rotational speed of the load side variable speed circulating pump 7 has not reached the upper limit, the rotational speed of the load side variable speed circulating pump 7 is increased (step 10011), and the increase value of the rotational speed of the load side variable speed circulating pump 7 is calculated using a PID algorithm known to those skilled in the art, and the process returns to step 10002. If the rotational speed of the load side variable speed circulating pump 7 has reached the upper limit, one or more of the source side variable speed circulating pumps 6 are stopped (step 10015), and the process returns to step 10002.

[0073] If the calculated feedback pressure difference (ΔP_feedback) is less than the set point opening pressure difference (ΔP1_setpoint), it is determined (step 10005) whether the calculated feedback pressure difference (ΔP_feedback) is less than or equal to the negative set point opening pressure difference (-ΔP1_setpoint), and if the calculated feedback pressure difference (ΔP_feedback) is greater than the negative set point opening pressure difference (-ΔP1_setpoint), the operating parameters of the source side variable speed circulating pump 6 and the load side variable speed circulating pump 7 are not changed (step 10008), and the process returns to step 10002. If the calculated feedback pressure difference (ΔP_feedback) is less than or equal to the negative set point opening pressure difference (-ΔP1_setpoint), it is determined (step 10009) whether the rotational speed of the source side variable speed circulating pump 6 has reached the upper limit, and if the rotational speed of the source side variable speed circulating pump 6 has not reached the upper limit, the rotational speed of the source side variable speed circulating pump 6 is increased (step 10010), and the increase value of the rotational speed of the source side variable speed circulating pump 6 is calculated using a PID algorithm known to those skilled in the art, and the process returns to step 10002. If the rotational speed of the source side variable speed circulating pump 6 has reached the upper limit, it is determined (step 10013) whether the rotational speed of the load side variable speed circulating pump 7 has reached the lower limit, and if the rotational speed of the load side variable speed circulating pump 7 has not reached the lower limit, the rotational speed of the load side variable speed circulating pump 7 is decreased (step 10014), and the decrease value of the rotational speed of the load side variable speed circulating pump 7 is calculated using a PID algorithm known to those skilled in the art, and the process returns to step 10002. If the rotational speed of the load side variable speed circulating pump 7 has reached the lower limit, one or more of the load side variable speed circulating pumps 7 are stopped (step 10016), and the process returns to step 10002.

[0074] In the foregoing description, it will be appreciated that reference is made to systems or components having known, obvious or foreseeable equivalents, such equivalents are included within the scope of the present disclosure, as if each were individually recited herein. To determine the true scope of the present disclosure, reference should be made to the appended claims, which should be given their full breadth of meaning. The reader will also understand that the entire disclosure of the present disclosure or features thereof described in relation to any one embodiment can be employed with any other embodiment or combination of any other embodiments, whether or not those features are specifically described in relation to that one embodiment. Although at least one exemplary embodiment has been shown and described, it is to be understood that for the purposes of the present disclosure, nonsignificant changes in the figures, the structural details of the embodiment or in the arrangement of components can be made and still be within the ambit of the present disclosure, and it is the intent that all such changes be covered by the scope of the patent granted.

[0075] The above embodiments are to be understood as illustrative examples of the disclosure. It should be understood that any feature described in relation to any one embodiment can be used alone or in combination with features described in relation to another embodiment and that the scope of the disclosure is not limited to any single embodiment but rather encompasses all possible combinations that can result from a combination of any of the features described, in any of the embodiments. Although at least one exemplary embodiment has been shown and described, it is to be understood that for the purposes of the present disclosure, nonsignificant changes in the figures, the structural details of the embodiment or in the arrangement of components can be made and still be within the ambit of the present disclosure, and it is the intent that all such changes be covered by the scope of the patent granted.

[0076] Furthermore, "comprising" does not exclude other elements or steps and "a" or "an" does not exclude a plurality. Also, any "consisting" does not exclude additional steps or elements. Furthermore, the features or steps can be combined in any order or in parallel, or can be comprised in another feature or step. It should be understood that all these modifications, alternatives and substitutions are intended to be included within the scope of the patent granted. These modifications, alternatives and substitutions can be made without departing from the spirit and scope of the present disclosure, which should be determined from the appended claims and their legal equivalents.

Claims

1. A pressure control module (100) for realizing supply and return water isolation and pressure safety decoupling of a water circulation system (1), wherein the water circulation system (1) comprises: a source side circulation (2) having at least one source component (4), a source side water supply interface (16), a source side water return interface (18), a source side bidirectional differential pressure bypass component (10) connected with the source side water supply interface (16) and the source side water return interface (18), and at least one source side variable speed circulation pump (6), a load side circulation (3) having at least one load component (5), a load side water supply interface (17), a load side water return interface (19), a load side bidirectional differential pressure bypass component (11) connected with the load side water supply interface (17) and the load side water return interface (19), and at least one load side variable speed circulation pump (7), a water return shutoff valve (31) connected with the source side water return interface (18) and the load side water return interface (19), and a water supply shutoff valve (32) connected with the source side water supply interface (16) and the load side water supply interface (17), characterized in that the pressure control module (100) is configured to: in normal operation, based on a set opening differential pressure (ΔP_setpoint), by continuously adjusting the at least one source side variable speed circulation pump (6) and / or the at least one load side variable speed circulation pump (7) in a closed loop manner, achieve the following purposes: (a) an absolute value of a calculated feedback differential pressure (ΔP_feedback) is less than the set opening differential pressure (ΔP_setpoint), (b) the source side bidirectional differential pressure bypass component (10) and the load side bidirectional differential pressure bypass component (11) remain in a closed state, (c) supply and return water isolation, the set opening differential pressure (ΔP_setpoint) is the lowest differential pressure that makes the source side bidirectional differential pressure bypass component (10) and the load side bidirectional differential pressure bypass component (11) conductive, the calculated feedback differential pressure (ΔP_feedback) is the differential pressure with the largest absolute value in a source side supply and return water differential pressure (ΔP1) and a load side supply and return water differential pressure (ΔP2), the source side supply and return water differential pressure (ΔP1) is a difference between a pressure Ps1 at the source side water supply interface (16) and a pressure Pr1 at the source side water return interface (18), the load side supply and return water differential pressure (ΔP2) is a difference between a pressure Ps2 at the load side water supply interface (17) and a pressure Pr2 at the load side water return interface (19), when a failure shutdown of the source side variable speed circulation pump (6) and / or the load side variable speed circulation pump (7) is monitored, quickly close the water return shutoff valve (31) and the water supply shutoff valve (32), so that the source side circulation (2) and the load side circulation (3) realize pressure safety decoupling.

2. The pressure control module (100) according to claim 1, wherein the set opening differential pressure (ΔP_setpoint) is 5 kPa to 200 kPa.

3. Pressure control module (100) according to claim 1, wherein the return shut-off valve (31) and the supply shut-off valve (32) have a closing time of not more than 30 seconds.

4. Pressure control module (100) according to any of the preceding claims 1 to 3, wherein the pressure control module (100) is configured to decrease the rotational speed of the source side variable speed circulating pump (6) and / or to increase the rotational speed of the load side variable speed circulating pump (7) if the calculated feedback pressure difference (AP_feedback) is greater than or equal to the set opening pressure difference (AP1_setpoint).

5. Pressure control module (100) according to any of the preceding claims 1 to 3, wherein the pressure control module (100) is configured to increase the rotational speed of the source side variable speed circulating pump (6) and / or to decrease the rotational speed of the load side variable speed circulating pump (7) if the calculated feedback pressure difference (AP_feedback) is less than or equal to the negated set opening pressure difference (-AP1_setpoint).

6. Method for implementing a supply-return isolation and pressure safety decoupling of a water circulation system (1), wherein the water circulation system (1) comprises: a source side circulation (2) having at least one source component (4), a source side supply water connection (16), a source side return water connection (18), a source side bidirectional differential pressure bypass component (10) connected to the source side supply water connection (16) and the source side return water connection (18), and at least one source side variable speed circulating pump (6), a load side circulation (3) having at least one load component (5), a load side supply water connection (17), a load side return water connection (19), a load side bidirectional differential pressure bypass component (11) connected to the load side supply water connection (17) and the load side return water connection (19), and at least one load side variable speed circulating pump (7), a return shut-off valve (31) connected to the source side return water connection (18) and the load side return water connection (19), and a supply shut-off valve (32) connected to the source side supply water connection (16) and the load side supply water connection (17). The method comprises: in normal operation, based on a set opening pressure difference (ΔP_setpoint), by continuously adjusting the at least one source-side variable speed circulating pump (6) and / or at least one load-side variable speed circulating pump (7) in a closed loop mode, to achieve the following purposes: (a) the absolute value of a calculated feedback pressure difference (ΔP_feedback) is less than the set opening pressure difference (ΔP_setpoint), (b) a source-side bidirectional pressure difference bypass component (10) and a load-side bidirectional pressure difference bypass component (11) remain in a closed state, (c) water supply and return water are isolated, the set opening pressure difference (ΔP_setpoint) is the lowest pressure difference to turn on the source-side bidirectional pressure difference bypass component (10) and the load-side bidirectional pressure difference bypass component (11), the calculated feedback pressure difference (ΔP_feedback) is the pressure difference with the largest absolute value in a source-side water supply and return water pressure difference (ΔP1) and a load-side water supply and return water pressure difference (ΔP2), the source-side water supply and return water pressure difference (ΔP1) is the difference between a pressure Ps1 at a source-side water supply interface (16) and a pressure Pr1 at a source-side return water interface (18), the load-side water supply and return water pressure difference (ΔP2) is the difference between a pressure Ps2 at a load-side water supply interface (17) and a pressure Pr2 at a load-side return water interface (19), When it is monitored that the source-side variable speed circulating pump (6) and / or the load-side variable speed circulating pump (7) is in a failure shutdown, the return water cut-off valve (31) and the water supply cut-off valve (32) are quickly closed, so that the source-side circulation (2) and the load-side circulation (3) are decoupled in safety pressure.

7. The method according to claim 6, wherein the set opening pressure difference (ΔP_setpoint) is 5 kPa to 200 kPa.

8. The method according to claim 6, wherein the return water cut-off valve (31) and the water supply cut-off valve (32) are closed within 30 seconds.

9. The method according to any one of the preceding claims 6 to 8, wherein if the calculated feedback pressure difference (ΔP_feedback) is greater than or equal to the set opening pressure difference (ΔP1_setpoint), the rotation speed of the source-side variable speed circulating pump (6) is reduced and / or the rotation speed of the load-side variable speed circulating pump (7) is increased.

10. The method according to any one of the preceding claims 6 to 8, wherein if the calculated feedback pressure difference (ΔP_feedback) is less than or equal to the negated set opening pressure difference (-ΔP1_setpoint), the rotation speed of the source-side variable speed circulating pump (6) is increased and / or the rotation speed of the load-side variable speed circulating pump (7) is reduced.

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