Dual water source mechanical automatic switching water supply device and switching method thereof

Abstract

The present application relates to a kind of dual water source mechanical automatic switching water supply device and switching method thereof, recovery water pipeline, its water inlet end is used to connect recovery water source;Tap water pipeline, its water inlet end is used to connect tap water source;Recovery water pipeline and tap water pipeline are communicated to water point by total convergence flow pipe;Recovery water pipeline is connected with first spring type check valve in series, tap water pipeline is connected with second spring type check valve in series;Recovery water pipeline is also provided with pressure stabilizing module, for maintaining the water pressure in recovery water pipeline is higher than the predetermined interval of the water pressure in tap water pipeline;First spring type check valve and second spring type check valve are driven to open or close by the pressure difference between recovery water pipeline and tap water pipeline, and the opening pressure difference of first spring type check valve and second spring type check valve is 0.10~0.12MPa.The present application realizes differential pressure driven automatic switching, without manual intervention, completely eliminate the problem of water cut caused by operation lag.

Description

Technical Field

[0001] This invention relates to the field of industrial water supply equipment technology, specifically to a dual-source mechanical automatic switching water supply device and its switching method. Background Technology

[0002] In industrial water treatment and production cleaning scenarios, water recycling systems are often used to conserve water resources. These systems collect and pressurize the recycled water discharged from the original system and reuse it at the cleaning stations. However, when the original water treatment system shuts down, the recycled water supply is also interrupted, requiring a switch to a backup tap water supply. Existing technologies have the following drawbacks: Manual switching has poor reliability: Traditional solutions use separate pipelines for recycled water and tap water, plus a manual ball valve at the end for switching. This results in high noise levels and obstructed visibility on-site. Operators may have difficulty detecting water pressure fluctuations in a timely manner, making it easy to miss the optimal switching window, leading to cleaning interruptions and equipment residues that affect product quality.

[0003] Poor adaptability of electrical control solutions: Existing automatic switching systems mostly use electric / solenoid valves, pneumatic diaphragm valves and other electrical control solutions, which require laying long-distance control cables. The failure rate of electrical components is high in humid environments, and the switching function is completely paralyzed when power or gas is cut off, which cannot meet the requirements of continuous production.

[0004] High risk of misjudgment: Existing cleaning equipment adopts a fixed-duration automatic shutdown mode. After the supply of recycled water is cut off, the program continues to run according to the set time. Operators are easily misled and may still judge the operation as qualified when the flow is insufficient, resulting in substandard cleaning.

[0005] Therefore, there is an urgent need for a water supply device that requires no external power, is highly reliable, can automatically prioritize the use of recycled water, and can seamlessly switch to a backup water source in the event of a water outage. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a dual-source mechanical automatic switching water supply device and its switching method. It aims to disclose a water supply device and control method that can automatically achieve priority switching and backup water replenishment of dual water sources without external power supply, and is suitable for scenarios with high requirements for continuous water supply, such as silk processing workshop cleaning, industrial circulating water replenishment, and air conditioning water replenishment.

[0007] To achieve the above objectives, the present invention provides the following technical solution: On the one hand, a dual-source mechanical automatic switching water supply device is proposed, comprising: The inlet end of the recycled water pipeline is used to connect to the recycled water source; The water inlet of a tap water pipe is used to connect to the tap water source. The outlet of the recycled water pipeline is connected to the outlet of the tap water pipeline through a main manifold to the point of use; A first spring-loaded check valve is connected in series on the recycled water pipeline, and a second spring-loaded check valve is connected in series on the tap water pipeline. The recycled water pipeline is also equipped with a pressure stabilizing module to maintain the water pressure in the recycled water pipeline within a predetermined range that is higher than the water pressure in the tap water pipeline; the predetermined range is that the water pressure in the recycled water pipeline is 0.10 to 0.12 MPa higher than the water pressure in the tap water pipeline. The first spring-loaded check valve and the second spring-loaded check valve are driven to open or close by the pressure difference between the recycled water pipeline and the tap water pipeline, so as to realize the automatic switching between the two water sources; the opening pressure difference of the first spring-loaded check valve and the second spring-loaded check valve is 0.10~0.12MPa. The pressure stabilizing module includes a variable frequency booster pump and a sealed constant pressure tank with an airbag. The outlet of the variable frequency booster pump is connected to the inlet of the constant pressure tank. The variable frequency booster pump is equipped with a variable frequency controller, which uses a PID closed-loop control algorithm to adjust the operating frequency of the variable frequency booster pump to maintain the water pressure in the recycled water pipeline within a predetermined range. The constant pressure tank is used to smooth out pressure fluctuations at the outlet of the variable frequency booster pump.

[0008] As a preferred technical solution, the variable frequency booster pump has a built-in pressure setpoint in its variable frequency controller, and a pressure sensor is installed on the recovery water pipeline. The pressure sensor is used to detect the actual water pressure value of the recovery water pipeline and feed the pressure signal back to the variable frequency controller. The variable frequency controller compares the actual water pressure value with the pressure setpoint, and outputs a control signal to adjust the operating frequency of the variable frequency booster pump after PID calculation.

[0009] As a preferred technical solution, the effective regulating volume of the constant pressure tank is ≥0.1m³. 3 .

[0010] As a preferred technical solution, the valve body of the first spring-type check valve and / or the second spring-type check valve is provided with an adjusting screw sleeve, which is used to adjust the pre-compression of the spring to adjust the opening pressure difference of the check valve.

[0011] As a preferred technical solution, a shut-off valve is provided at the beginning of the inlet end of the recycled water pipeline, and a first manual ball valve is provided at the end of the inlet end.

[0012] As a preferred technical solution, a normally open second manual ball valve is installed at the inlet end of the tap water pipeline.

[0013] As a preferred technical solution, it also includes an emergency manual bypass module, which is connected in parallel to both ends of the second spring-loaded check valve on the tap water pipeline, and a normally closed third manual ball valve is installed on the bypass pipeline of the emergency manual bypass module.

[0014] As a preferred technical solution, a flow meter is also connected to the recycled water pipeline.

[0015] As a preferred technical solution, both the first spring-loaded check valve and the second spring-loaded check valve adopt a dual sealing structure that combines a metal hard seal with a PTFE soft seal.

[0016] As a preferred technical solution, the valve body and valve disc of the first spring-loaded check valve and the second spring-loaded check valve are both made of 304 stainless steel, and the internal leakage rate is ≤0.01mL / min.

[0017] On the other hand, a dual-source automatic switching method is also proposed, which is implemented using the dual-source mechanical automatic switching water supply device as described above, including the following steps: S1: When the recycled water system is running, the pressure stabilizing module maintains the water pressure in the recycled water pipeline within a predetermined range that is higher than the water pressure in the tap water pipeline. The valve disc of the first spring-type check valve is opened by the recycled water pressure, and the recycled water is supplied to the water point through the recycled water pipeline. The valve disc of the second spring-type check valve is pressed against the valve seat by the recycled water side pressure and is in the closed state. S2: When the recycled water supply is interrupted, the water pressure in the recycled water pipeline drops. When the water pressure in the recycled water pipeline is lower than the water pressure in the tap water pipeline by a predetermined range, the valve disc of the second spring-type check valve is opened by the tap water pressure, and the tap water is supplied to the water point through the tap water pipeline; the first spring-type check valve closes automatically due to the disappearance of back pressure. S3: After the water recovery system is restored, the water pressure in the water recovery pipeline rises. When the water pressure in the water recovery pipeline is higher than the water pressure in the tap water pipeline and reaches a predetermined range, the first spring-loaded check valve opens again and the second spring-loaded check valve closes again, returning to the water recovery priority supply mode.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial effects: Safe and reliable: Purely mechanical structure, no power supply, air supply and control cables required, no risk of electrical failure, can operate stably in power outage, humid and explosion-proof scenarios, and the switching response speed is in the millisecond level.

[0019] Zero water supply interruption: Differential pressure-driven automatic switching eliminates the need for manual intervention and completely eliminates water outages caused by operational delays; a manual bypass provides triple redundancy, ensuring water supply even under extreme conditions.

[0020] Low cost and easy maintenance: Utilizing existing water pump equipment, only two custom-made check valves, one constant pressure tank, and a small amount of piping are needed, with construction costs only 1 / 3 of the electrical control solution; there are no easily damaged electrical components, reducing annual maintenance costs by more than 80%.

[0021] Improved cleaning quality: The constant pressure tank smooths out pressure fluctuations, ensures stable water pressure at the end of the cleaning process, and reduces equipment residue and batch quality risks.

[0022] Highly adaptable: It can be replicated and applied to various dual-source water backup scenarios, especially suitable for industrial pipe gallery environments with no power supply, explosion-proof, and high humidity. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a manual switching pipeline structure in the prior art; Figure 2 This is a schematic diagram of the pipeline for the differential pressure driven one-way valve group proposed in this invention. Figure 1 ; Figure 3 This is a schematic diagram of the pipeline for the differential pressure driven one-way valve group proposed in this invention. Figure 2 ; Figure 4 This is a schematic diagram of the process of an automatic switching method for dual water sources proposed in this invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Recycled water tank; 2. Shut-off valve; 3. Variable frequency booster pump; 4. First spring-loaded check valve; 5. Flow meter; 6. Pressure sensor; 7. First manual ball valve; 8. Second manual ball valve; 9. Third manual ball valve; 10. Water-using equipment; 11. Second spring-loaded check valve; 12. Bypass pipeline; 13. Recycled water pipeline; 14. Tap water pipeline. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1 The diagram shows the existing manual switching pipeline structure, which uses separate pipelines for recycled water and tap water, plus a manual ball valve at the end for switching. This type of device is noisy on site, obstructs the view, and makes it difficult for operators to detect water pressure fluctuations in time, making it easy to miss the optimal switching window, resulting in cleaning interruptions and equipment residues that affect product quality.

[0027] See Figure 2-3 The present invention provides a dual-source mechanical automatic switching water supply device, comprising: The inlet end of the recycled water pipeline 13 is used to connect to the recycled water source. Water supply pipe 14, the inlet end of which is used to connect to the tap water source; The outlet of the recycled water pipeline 13 is connected to the outlet of the tap water pipeline 14 through a main manifold to the point of use; A first spring-loaded check valve 4 is connected in series on the recycled water pipeline 13, and a second spring-loaded check valve 11 is connected in series on the tap water pipeline 14. The recycled water pipeline 13 is also equipped with a pressure stabilizing module, which is used to maintain the water pressure in the recycled water pipeline 13 within a predetermined range that is higher than the water pressure in the tap water pipeline 14; the predetermined range is that the water pressure in the recycled water pipeline 13 is 0.10 to 0.12 MPa higher than the water pressure in the tap water pipeline 14. The first spring-loaded check valve 4 and the second spring-loaded check valve 11 are driven to open or close by the pressure difference between the recovery water pipeline 13 and the tap water pipeline 14, so as to realize the automatic switching of the two water sources; the opening pressure difference of the first spring-loaded check valve 4 and the second spring-loaded check valve 11 is 0.10 to 0.12 MPa. The pressure stabilizing module includes a variable frequency booster pump 3 and a sealed, air-filled constant pressure tank. The outlet of the variable frequency booster pump 3 is connected to the inlet of the constant pressure tank. The variable frequency booster pump 3 is equipped with a variable frequency controller, which uses a PID closed-loop control algorithm to adjust the operating frequency of the booster pump 3 to maintain the water pressure in the recovery water pipeline 13 within a predetermined range. The constant pressure tank is used to smooth out pressure fluctuations at the outlet of the variable frequency booster pump 3. The variable frequency booster pump 3 can be selected with a calibrated flow rate ≥2.5m³ / h. 3 Specifications with a flow rate of / h and a head of ≥65m can also be selected according to actual needs, as long as the pressure requirement of the furthest water point is met.

[0028] Preferably, the variable frequency booster pump 3 has a built-in pressure setpoint in its variable frequency controller, and a pressure sensor 6 is installed on the recovery water pipeline 13. The pressure sensor 6 is used to detect the actual water pressure value of the recovery water pipeline 13 and feed the pressure signal back to the variable frequency controller. The variable frequency controller compares the actual water pressure value with the pressure setpoint, and outputs a control signal to adjust the operating frequency of the variable frequency booster pump 3 after PID calculation.

[0029] Preferably, the effective regulating volume of the constant pressure tank is ≥0.1m³. 3 .

[0030] Preferably, the valve body of the first spring-type check valve 4 and / or the second spring-type check valve 11 is provided with an adjusting screw sleeve, which is used to adjust the pre-compression of the spring to adjust the opening pressure difference of the check valve.

[0031] Preferably, a shut-off valve 2 is provided at the beginning of the inlet end of the water inlet of the water recovery pipeline 13, and a first manual ball valve 7 is provided at the end of the inlet end.

[0032] Preferably, the inlet end of the tap water pipeline 14 is equipped with a normally open second manual ball valve 8.

[0033] Preferably, it also includes an emergency manual bypass module, which is connected in parallel to both ends of the second spring-loaded check valve 11 on the tap water pipeline 14, and a normally closed third manual ball valve 9 is provided on the bypass pipeline 12 of the emergency manual bypass module.

[0034] The above facilitates manual control by on-site operators. In this way, automatic switching can be achieved under normal operating conditions via the pressure difference of the check valve; in case of a malfunction, on-site personnel can manually control the system using the ball valve.

[0035] Preferably, a flow meter 5 is also connected to the recycled water pipeline 13. The flow meter 5 is used to monitor the flow rate of the fluid in the recycled water pipeline 13.

[0036] Preferably, both the first spring-loaded check valve 4 and the second spring-loaded check valve 11 adopt a dual sealing structure combining a metal hard seal and a PTFE soft seal.

[0037] Preferably, the valve body and valve disc of the first spring-loaded check valve 4 and the second spring-loaded check valve 11 are both made of 304 stainless steel, with an internal leakage rate ≤0.01mL / min. On the other hand, such as Figure 4 As shown, the present invention also provides a method for automatic switching between dual water sources, which is implemented using the dual-water-source mechanical automatic switching water supply device described above, and includes the following steps: S1: When the recycled water system is running, the pressure stabilizing module maintains the water pressure in the recycled water pipeline 13 within a predetermined range that is higher than the water pressure in the tap water pipeline 14. The valve disc of the first spring-type check valve 4 is opened by the recycled water pressure, and the recycled water is supplied to the water point through the recycled water pipeline 13. The valve disc of the second spring-type check valve 11 is pressed against the valve seat by the recycled water side pressure and is in the closed state. S2: When the recycled water supply is interrupted, the water pressure in the recycled water pipeline 13 drops. When the water pressure in the recycled water pipeline 13 is lower than the water pressure in the tap water pipeline 14 by a predetermined range, the valve disc of the second spring-type check valve 11 is opened by the tap water pressure, and the tap water is supplied to the water point through the tap water pipeline 14; the first spring-type check valve 4 is automatically closed due to the disappearance of back pressure. S3: After the water recovery system is restored, the water pressure in the water recovery pipeline 13 rises. When the water pressure in the water recovery pipeline 13 is higher than the water pressure in the tap water pipeline 14 and reaches the predetermined range, the first spring-loaded check valve 4 opens again and the second spring-loaded check valve 11 closes again, returning to the water recovery priority supply mode.

[0038] Example 1 The recycled water pipeline is connected in parallel to the existing tap water pipeline 14 in the workshop, 2m before the water-using equipment 10: Recycled water side: Recycled water tank 1 → Shut-off valve 2 → Variable frequency booster pump 3 (existing equipment, flow rate 3m³ / h) 3 / h, head 65m) → Sealed constant pressure tank with air bladder (volume 0.1m³) 3 → Customized high-precision first spring type check valve 4 (opening pressure difference 0.10~0.12MPa, metal hard seal + PTFE soft seal) → manifold; Water supply side: Water supply network → normally open manual ball valve → customized high-precision second spring check valve 11 → manifold, bypass manual ball valve connected in parallel to both ends of the water supply side check valve, normally closed.

[0039] Example 2 This embodiment applies the invention to the cooling tower water replenishment stage of a central air conditioning system in an industrial plant, using recycled water as the main water source for the cooling tower and tap water as a backup water source.

[0040] Recycled water side: Recycled water collection tank → Shut-off valve 2 → Variable frequency booster pump 3 (flow rate ≥ 2.5m³ / h after verification) 3 / h, head ≥65m, meeting the water supply pressure requirements of the furthest cooling tower) → Sealed constant pressure tank with air bladder (effective adjustable volume ≥0.1m³) 3 → Pressure sensor 6 → First spring-type check valve 4 (opening pressure difference 0.10~0.12MPa, metal hard seal + PTFE soft seal double sealing structure, valve body and valve disc are made of 304 stainless steel, internal leakage rate ≤0.01mL / min) → manifold → cooling tower water supply point; Water supply side: Municipal water supply network → Normally open second manual ball valve 8 → Second spring-loaded check valve 11 (opening pressure difference 0.10~0.12MPa, metal hard seal + PTFE soft seal double sealing structure, valve body and valve disc are made of 304 stainless steel, internal leakage rate ≤0.01mL / min) → manifold → cooling tower water supply point; An emergency manual bypass module is connected in parallel to both ends of the second spring-loaded check valve 11 on the tap water side, and a normally closed third manual ball valve 9 is installed on the bypass pipeline 12.

[0041] The variable frequency booster pump 3 is equipped with a variable frequency controller. The variable frequency controller has a built-in pressure setpoint and uses a PID closed-loop control algorithm to maintain the water pressure in the recovery water pipeline 13 within a predetermined range of 0.10 to 0.12 MPa higher than the water pressure in the tap water pipeline 14. The pressure sensor 6 detects the actual water pressure value in the recovery water pipeline 13 in real time and feeds the pressure signal back to the variable frequency controller. The variable frequency controller compares the actual water pressure value with the pressure setpoint and outputs a control signal to adjust the operating frequency of the variable frequency booster pump 3. The constant pressure tank is used to smooth the pressure fluctuation at the outlet of the variable frequency booster pump 3.

[0042] When the air conditioning system is running, the pressure stabilizing module maintains the water pressure in the recycled water pipeline 13 at 0.10–0.12 MPa higher than the water pressure in the tap water pipeline 14. The first spring-loaded check valve 4 is opened by the recycled water pressure, and the recycled water prioritizes replenishing the cooling tower. When the recycled water system is interrupted due to maintenance or shutdown of the original water production system, the water pressure in the recycled water pipeline 13 drops to 0.10–0.12 MPa lower than the water pressure in the tap water pipeline 14. The second spring-loaded check valve 11 is opened by the tap water pressure, and the tap water automatically switches to replenish the cooling tower. The first spring-loaded check valve 4 automatically closes due to the disappearance of back pressure. After the recycled water system is restored, when the water pressure in the recycled water pipeline 13 rises back to 0.10–0.12 MPa higher than the water pressure in the tap water pipeline 14, the first spring-loaded check valve 4 reopens and the second spring-loaded check valve 11 closes again, automatically returning to the recycled water priority replenishment mode.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-source mechanical automatic switching water supply device, characterized in that, include: The inlet end of the recycled water pipeline is used to connect to the recycled water source; The water inlet of a tap water pipe is used to connect to the tap water source. The outlet of the recycled water pipeline is connected to the outlet of the tap water pipeline through a main manifold to the point of use; A first spring-loaded check valve is connected in series on the recycled water pipeline, and a second spring-loaded check valve is connected in series on the tap water pipeline. The recycled water pipeline is also equipped with a pressure stabilizing module, which is used to maintain the water pressure in the recycled water pipeline within a predetermined range that is higher than the water pressure in the tap water pipeline; the predetermined range is that the water pressure in the recycled water pipeline is 0.10 to 0.12 MPa higher than the water pressure in the tap water pipeline. The first spring-loaded check valve and the second spring-loaded check valve are driven to open or close by the pressure difference between the recycled water pipeline and the tap water pipeline, thereby realizing automatic switching between the two water sources; the opening pressure difference of the first spring-loaded check valve and the second spring-loaded check valve is 0.10 to 0.12 MPa. The pressure stabilizing module includes a variable frequency booster pump and a sealed, air-filled constant pressure tank. The outlet of the variable frequency booster pump is connected to the inlet of the constant pressure tank. The variable frequency booster pump is equipped with a variable frequency controller, which uses a PID closed-loop control algorithm to adjust the operating frequency of the variable frequency booster pump to maintain the water pressure in the recycled water pipeline within the predetermined range. The constant pressure tank is used to smooth out pressure fluctuations at the outlet of the variable frequency booster pump.

2. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, The variable frequency booster pump has a built-in pressure setpoint in its variable frequency controller. A pressure sensor is installed on the recycled water pipeline. The pressure sensor is used to detect the actual water pressure value of the recycled water pipeline and feed the pressure signal back to the variable frequency controller. The variable frequency controller compares the actual water pressure value with the pressure setpoint and outputs a control signal to adjust the operating frequency of the variable frequency booster pump after PID calculation.

3. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, The effective regulating volume of the constant pressure tank is ≥0.1m³. 3 .

4. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, The valve body of the first spring-loaded check valve and / or the second spring-loaded check valve is provided with an adjusting screw sleeve, which is used to adjust the pre-compression of the spring to adjust the opening pressure difference of the check valve.

5. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, The inlet end of the recycled water pipeline is equipped with a shut-off valve, and the outlet end is equipped with a first manual ball valve.

6. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, The inlet end of the tap water pipeline is equipped with a normally open second manual ball valve.

7. The dual-source mechanical automatic switching water supply device according to claim 1, characterized in that, It also includes an emergency manual bypass module, which is connected in parallel to both ends of the second spring-loaded check valve on the tap water pipeline, and a normally closed third manual ball valve is provided on the bypass pipeline of the emergency manual bypass module.

8. The dual-source mechanical automatic switching water supply device according to any one of claims 1-7, characterized in that, Both the first spring-loaded check valve and the second spring-loaded check valve adopt a dual sealing structure that combines a metal hard seal with a PTFE soft seal.

9. The dual-source mechanical automatic switching water supply device according to any one of claims 1-7, characterized in that, The valve body and valve disc of both the first spring-loaded check valve and the second spring-loaded check valve are made of 304 stainless steel, and the internal leakage rate is ≤0.01mL / min.

10. A method for automatic switching between dual water sources, implemented using the dual-water-source mechanical automatic switching water supply device as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: When the recycled water system is running, the pressure stabilizing module maintains the water pressure in the recycled water pipeline within a predetermined range that is higher than the water pressure in the tap water pipeline. The valve disc of the first spring-type check valve is opened by the recycled water pressure, and the recycled water is supplied to the water point through the recycled water pipeline. The valve disc of the second spring-type check valve is pressed against the valve seat by the recycled water side pressure and is in the closed state. S2: When the recycled water supply is interrupted, the water pressure in the recycled water pipeline drops. When the water pressure in the recycled water pipeline is lower than the water pressure in the tap water pipeline and reaches the predetermined range, the valve disc of the second spring-type check valve is opened by the tap water pressure, and tap water is supplied to the water point through the tap water pipeline; the first spring-type check valve closes automatically due to the disappearance of back pressure. S3: After the water recovery system is restored, the water pressure in the water recovery pipeline rises. When the water pressure in the water recovery pipeline is higher than the water pressure in the tap water pipeline and reaches the predetermined range, the first spring-loaded check valve opens again and the second spring-loaded check valve closes again, returning to the water recovery priority supply mode.

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