A diaphragm rupture alarm device and method for a diaphragm metering pump

Abstract

This invention discloses an alarm device and method for preventing diaphragm rupture in a diaphragm metering pump. The outlet of the emergency replenishment tank is connected to the first opening of the quick-connect tee for the metering pump inlet, and the second opening of the quick-connect tee for the metering pump inlet is connected to the inlet of the metering pump. The top of the emergency replenishment tank is equipped with an injection stop valve and an air inlet check valve. The outlet of the metering pump is connected to the first opening of the quick-connect tee for the metering pump outlet, and the second opening of the quick-connect tee for the metering pump outlet is connected to the dosing point. The third opening of the quick-connect tee for the metering pump outlet is connected to the inlet of a pressure relief buffer tank via a pressure relief check valve. The outlet at the bottom of the pressure relief buffer tank is connected to a floor drain via an emptying check valve. An overpressure conductivity meter is connected to the bottom of the pressure relief buffer tank, and a loss conductivity meter is connected to the upper side of the emergency replenishment tank. This device and method can prevent diaphragm rupture accidents in diaphragm metering pumps and has high safety.

Description

Technical Field

[0001] This invention belongs to the field of solution metering and transportation, and relates to a diaphragm metering pump anti-diaphragm rupture alarm device and method. Background Technology

[0002] A diaphragm metering pump is a positive displacement reciprocating pump used for metering and conveying solutions. It is widely used in the chemical, food and beverage, pharmaceutical, microelectronics, water treatment, and thermal power generation industries for the addition of pharmaceuticals.

[0003] The core component of a diaphragm metering pump is a flexible diaphragm. Driven by hydraulic oil or a connecting rod, the diaphragm reciprocates, drawing in the solution and discharging it at a certain pressure to the dosing point. Under normal operating conditions, the pressure on both sides of the diaphragm is generally balanced, and with regular diaphragm replacement, rupture is generally not a problem. However, in actual operation, if there is no solution replenishment on the metering pump's suction side (i.e., the pump is running dry), the liquid side of the diaphragm will lose pressure, causing it to rupture. Conversely, if the metering pump outlet is blocked (i.e., pressure buildup), the liquid side pressure of the diaphragm will continuously increase, eventually causing the diaphragm to rupture on the power side (hydraulic oil or connecting rod).

[0004] When the diaphragm of a metering pump ruptures, it will cause hydraulic oil or lubricating oil to leak from the pump body, causing pollution. In severe cases, it may even cause hydraulic oil to enter the dosing point, affecting the safe operation of the entire process system. On the other hand, it may also cause the conveyed solution to enter the metering pump housing, leading to corrosion or damage to the internal structure of the housing, or even causing the entire metering pump to be scrapped.

[0005] To address the problems caused by diaphragm rupture in diaphragm metering pumps, the following methods are generally used:

[0006] In the current use of diaphragm metering pumps, some users have opted for dual-diaphragm rupture alarm devices. These devices employ a dual-diaphragm structure, where a vacuum is created or a conductive medium is added between the two diaphragms. When a diaphragm ruptures, the change in vacuum or conductivity triggers an alarm signal. Operators then have to go to the site to troubleshoot after receiving the alarm. In this situation, both diaphragms are already ruptured and unusable, requiring the metering pump to be stopped and the diaphragms replaced. This not only compromises the continuity of the solution addition process but also involves a significant amount of on-site work, and the replacement cost of the dual-diaphragm rupture alarm device is high.

[0007] For the two situations that are prone to causing diaphragm rupture, there is currently no monitoring method for metering pumps running dry, and it can only rely on the pre-start inspection or patrol by on-site operators, which has poor reliability. In order to avoid pressure buildup in the diaphragm metering pump, the outlet of the diaphragm metering pump is generally equipped with a safety valve. When the metering pump outlet is pressured, the safety valve releases to protect the diaphragm metering pump. However, there is also no monitoring method for the release of the safety valve. It can only be judged after the abnormality of the solution addition process, which has a large lag and a high risk of impact on the system. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a diaphragm rupture alarm device and method for diaphragm metering pumps. This device and method can prevent diaphragm rupture accidents in diaphragm metering pumps and has high safety.

[0009] To achieve the above objectives, the present invention discloses a diaphragm metering pump anti-diaphragm rupture alarm device, comprising an emergency replenishment tank, a metering pump inlet quick-connect tee, a metering pump, an emergency replenishment tank, a metering pump outlet quick-connect tee, a dosing point, a pressure relief check valve, a pressure relief buffer tank, an emptying check valve, and a floor drain.

[0010] The outlet of the emergency replenishment tank is connected to the first opening of the quick-connect tee for the metering pump inlet, and the second opening of the quick-connect tee for the metering pump inlet is connected to the inlet of the metering pump. The top of the emergency replenishment tank is equipped with a liquid injection shut-off valve and an air inlet check valve. The outlet of the metering pump is connected to the first opening of the quick-connect tee for the metering pump outlet, and the second opening of the quick-connect tee for the metering pump outlet is connected to the dosing point. The third opening of the quick-connect tee for the metering pump outlet is connected to the inlet of the pressure relief buffer tank via a pressure relief check valve. The outlet at the bottom of the pressure relief buffer tank is connected to the floor drain via an emptying check valve. The bottom of the pressure relief buffer tank is connected to an overpressure conductivity meter, and the top of the emergency replenishment tank is connected to a loss conductivity meter.

[0011] The third opening of the quick-connect tee at the metering pump inlet is connected to the pipeline from the solution tank.

[0012] The outlet of the emergency replenishment tank is connected to the first opening of the quick-connect tee at the inlet of the metering pump via a replenishment check valve.

[0013] The second opening of the quick-connect tee at the metering pump inlet is connected to the metering pump inlet via the metering pump inlet pipe.

[0014] The diaphragm metering pump anti-diaphragm rupture alarm method of the present invention includes the following steps:

[0015] When the diaphragm metering pump runs dry due to a loss of liquid in its inlet pipe, a vacuum is created in the pipe between the metering pump inlet and the replenishing check valve. When the vacuum level in this pipe exceeds the opening pressure of the replenishing check valve, the valve opens, allowing the solution in the emergency replenishing tank to be drawn into the pump through the quick-connect tee at the pump inlet, preventing the pump from running dry. When the solution level in the emergency replenishing tank drops below the liquid loss conductivity meter, the meter reading changes, triggering a liquid loss alarm signal. As the solution level in the emergency replenishing tank continues to decrease, a vacuum forms. When the vacuum level exceeds the opening pressure of the air inlet check valve, the valve opens, allowing outside air to enter the tank and breaking the vacuum. This ensures that the emergency replenishing tank can continuously replenish solution to the metering pump inlet.

[0016] Also includes:

[0017] When the metering pump outlet pipe is blocked and pressure builds up at the metering pump outlet, the pressure in the pipe between the metering pump outlet and the pressure relief check valve increases. When the metering pump outlet pressure exceeds the opening pressure of pressure relief check valve 5, the pressure relief check valve opens, and the solution output by the metering pump is sent into the pressure relief buffer tank through the metering pump outlet quick-connect tee, releasing the metering pump outlet pressure. When the liquid level in the pressure relief buffer tank rises above the overpressure conductivity meter, the overpressure conductivity meter reading changes, thus outputting a pressure buildup alarm signal at the metering pump outlet. As the solution in the pressure relief buffer tank continues to rise, the pressure at the bottom of the pressure relief buffer tank continuously increases. When the pressure at the bottom of the pressure relief buffer tank exceeds the opening pressure of the drain check valve, the drain check valve opens, and the solution in the pressure relief buffer tank flows into the floor drain, preventing the pressure relief buffer tank from filling up and failing in a short time.

[0018] Also includes:

[0019] Before the diaphragm metering pump anti-diaphragm rupture alarm device is activated, a portion of the delivery solution is added to the emergency replenishment tank through the injection shut-off valve. After the emergency replenishment tank is filled, the injection shut-off valve is closed. At this time, the liquid loss conductivity meter displays the normal conductivity value when there is solution in the emergency replenishment tank. The opening pressure of the pressure relief check valve is adjusted to 1.1-1.2 times the operating pressure of the metering pump.

[0020] Adjust the opening pressure of the vent check valve so that it can open when there is 1 / 3 solution in the pressure relief buffer tank.

[0021] The present invention has the following beneficial effects:

[0022] In specific operation, the diaphragm metering pump anti-diaphragm rupture alarm device and method of the present invention, when the vacuum degree in the pipeline between the metering pump inlet and the replenishing check valve is greater than the opening pressure of the replenishing check valve, the replenishing check valve opens, and the solution in the emergency replenishing tank is sucked into the metering pump through the quick-connect tee at the metering pump inlet, avoiding the metering pump running dry. Thus, when the diaphragm metering pump inlet loses liquid and runs dry, the emergency measures are automatically activated without manual intervention or electrical signals. Within a short time after the emergency measures are activated, a corresponding alarm signal can be given in a timely manner to remind the operators to deal with the problem quickly and avoid the occurrence of diaphragm rupture accidents of the diaphragm metering pump, and the safety is high.

[0023] Furthermore, when the metering pump outlet pipe is blocked and pressure builds up at the metering pump outlet, if the metering pump outlet pressure exceeds the opening pressure of the pressure relief check valve, the pressure relief check valve will open. The solution output by the metering pump will then be sent into the pressure relief buffer tank through the metering pump outlet quick-connect tee, releasing the metering pump outlet pressure. This allows for the automatic activation of emergency measures when pressure builds up at the diaphragm metering pump outlet, enabling proactive accident handling, preventing equipment damage and economic losses caused by accidents, and effectively reducing the workload of operators during accident handling. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Among them, 1 is a pressure relief buffer tank, 2 is an emergency replenishment tank, 3 is an overpressure conductivity meter, 4 is a liquid loss conductivity meter, 5 is a pressure relief check valve, 6 is an emptying check valve, 7 is a liquid injection shut-off valve, 8 is an air inlet check valve, 9 is a replenishment check valve, 10 is a metering pump inlet quick-connect tee, and 11 is a metering pump outlet quick-connect tee. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, 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 merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0027] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] refer to Figure 1 The diaphragm metering pump anti-diaphragm rupture alarm device of the present invention includes a pressure relief buffer tank 1, an emergency replenishment tank 2, an overpressure conductivity meter 3, a liquid loss conductivity meter 4, a pressure relief check valve 5, an emptying check valve 6, a liquid injection shut-off valve 7, an air inlet check valve 8, a replenishment check valve 9, a metering pump inlet quick-connect tee 10, and a metering pump outlet quick-connect tee 11.

[0029] The outlet of the emergency replenishment tank 2 is connected to the first opening of the metering pump inlet quick-connect tee 10 via a replenishment check valve 9. The second opening of the metering pump inlet quick-connect tee 10 is connected to the metering pump inlet via the metering pump inlet pipe. The top of the emergency replenishment tank 2 is equipped with a liquid injection shut-off valve 7 for adding solution and an adjustable-pressure air inlet check valve 8. The outlet of the metering pump is connected to the first opening of the metering pump outlet quick-connect tee 11. The second opening of the metering pump outlet quick-connect tee 11 is connected to the dosing point. The third opening of the metering pump outlet quick-connect tee 11 is connected to the inlet of the pressure relief buffer tank 1 via an adjustable-pressure pressure relief check valve 5. The outlet at the bottom of the pressure relief buffer tank 1 is connected to the floor drain via an emptying check valve 6. The third opening of the metering pump inlet quick-connect tee 10 is connected to the liquid supply pipe from the solution tank.

[0030] In this embodiment, the bottom of the pressure relief buffer tank 1 is connected to an overpressure conductivity meter 3, and the upper side of the emergency replenishment tank 2 is connected to a loss conductivity meter 4. Based on the conductivity changes of the overpressure conductivity meter 3 and the loss conductivity meter 4, an alarm signal indicating pressure buildup at the metering pump outlet or loss of liquid at the metering pump inlet is output to the external upper-level monitoring system.

[0031] refer to Figure 1 The diaphragm metering pump anti-diaphragm rupture alarm method of the present invention includes the following steps:

[0032] Before operating the diaphragm rupture alarm device for the diaphragm metering pump, first add a portion of the delivery solution to the emergency replenishment tank 2 through the injection shut-off valve 7. After filling the emergency replenishment tank 2, close the injection shut-off valve 7. At this time, the conductivity meter 4 displays the normal conductivity value when there is solution in the emergency replenishment tank 2. Adjust the opening pressure of the pressure relief check valve 5 to 1.1-1.2 times the operating pressure of the metering pump; specifically, adjust the opening pressure of the evacuation check valve 6 so that it can open when there is 1 / 3 solution in the pressure relief buffer tank 1.

[0033] When the diaphragm metering pump runs dry due to a loss of liquid in its inlet pipe, a vacuum is created in the pipe between the metering pump inlet and the replenishment check valve 9. When the vacuum level in this pipe exceeds the opening pressure of the replenishment check valve 9, the valve opens, allowing the solution in the emergency replenishment tank 2 to be drawn into the metering pump via the quick-connect tee 10 at the pump inlet, preventing the pump from running dry. When the solution level in the emergency replenishment tank 2 drops below the liquid loss conductivity meter 4, the meter reading changes, triggering a liquid loss alarm signal. As the solution level in the emergency replenishment tank 2 continues to decrease, a vacuum forms. When the vacuum level in the emergency replenishment tank 2 exceeds the opening pressure of the air inlet check valve 8, the valve opens, allowing outside air to enter the emergency replenishment tank 2. This breaks the vacuum and ensures that the emergency replenishment tank 2 can continuously replenish solution to the metering pump inlet.

[0034] When the metering pump outlet pipe becomes blocked and pressure builds up at the metering pump outlet, the pressure in the pipe between the metering pump outlet and the pressure relief check valve 5 increases. When the metering pump outlet pressure exceeds the opening pressure of the pressure relief check valve 5, the pressure relief check valve 5 opens, and the solution output by the metering pump is sent into the pressure relief buffer tank 1 through the metering pump outlet quick-connect tee 11. The outlet pressure of the metering pump is released. When the solution level in the pressure relief buffer tank 1 rises above the overpressure conductivity meter 3, the value of the overpressure conductivity meter 3 changes, thereby outputting a pressure buildup alarm signal at the metering pump outlet. As the solution level in the pressure relief buffer tank 1 continues to rise, the pressure at the bottom of the pressure relief buffer tank 1 continuously increases. When the pressure at the bottom of the pressure relief buffer tank 1 exceeds the opening pressure of the vent check valve 6, the vent check valve 6 opens, and the solution in the pressure relief buffer tank 1 flows into the floor drain, preventing the pressure relief buffer tank 1 from filling up and failing in a short time.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for alarming diaphragm rupture in a diaphragm metering pump, characterized in that, Based on the diaphragm metering pump anti-diaphragm rupture alarm device, the diaphragm metering pump anti-diaphragm rupture alarm device includes an emergency replenishment tank (2), a metering pump inlet quick-connect tee (10), a metering pump, a metering pump outlet quick-connect tee (11), a dosing point, a pressure relief check valve (5), a pressure relief buffer tank (1), an emptying check valve (6), and a floor drain. The outlet of the emergency replenishment tank (2) is connected to the first opening of the metering pump inlet quick-connect tee (10), the second opening of the metering pump inlet quick-connect tee (10) is connected to the inlet of the metering pump, the top of the emergency replenishment tank (2) is equipped with a liquid injection stop valve (7) and an air inlet check valve (8); the outlet of the metering pump is connected to the first opening of the metering pump outlet quick-connect tee (11), the second opening of the metering pump outlet quick-connect tee (11) is connected to the dosing point, the third opening of the metering pump outlet quick-connect tee (11) is connected to the inlet of the pressure relief buffer tank (1) via a pressure relief check valve (5), the outlet at the bottom of the pressure relief buffer tank (1) is connected to the floor drain via an emptying check valve (6), the bottom of the pressure relief buffer tank (1) is connected to an overpressure conductivity meter (3), and the upper side of the emergency replenishment tank (2) is connected to a loss conductivity meter (4). The outlet of the emergency replenishment tank (2) is connected to the first opening of the quick-connect tee (10) at the inlet of the metering pump via the replenishment check valve (9); The second opening of the metering pump inlet quick-connect tee (10) is connected to the metering pump inlet via the metering pump inlet pipe; Includes the following steps: When the diaphragm metering pump loses liquid in the inlet pipe and runs dry, a vacuum is formed in the pipe between the metering pump inlet and the replenishment check valve (9). When the vacuum in the pipe between the metering pump inlet and the replenishment check valve (9) is greater than the opening pressure of the replenishment check valve (9), the replenishment check valve (9) opens, and the solution in the emergency replenishment tank (2) is sucked into the metering pump through the metering pump inlet quick-connect tee (10), thus preventing the metering pump from running dry. When the liquid level in the emergency replenishment tank (2) drops to the level of the liquid loss conductivity meter (4), When the liquid level drops below 0, the value of the liquid loss conductivity meter (4) changes, and a liquid loss alarm signal is output for the metering pump. As the solution in the emergency replenishment tank (2) continues to decrease, a vacuum will be formed in the emergency replenishment tank (2). When the vacuum level in the emergency replenishment tank (2) is greater than the opening pressure of the inlet check valve (8), the inlet check valve (8) opens, and outside air enters the emergency replenishment tank (2). The vacuum in the emergency replenishment tank (2) is broken, ensuring that the emergency replenishment tank (2) can continuously replenish the solution to the metering pump inlet. Also includes: When the metering pump outlet pipe is blocked and the metering pump outlet is pressurized, the pressure in the pipe between the metering pump outlet and the pressure relief check valve (5) increases. When the metering pump outlet pressure is greater than the opening pressure of the pressure relief check valve (5), the pressure relief check valve (5) opens, and the solution output by the metering pump is sent into the pressure relief buffer tank (1) through the metering pump outlet quick-connect tee (11). The metering pump outlet pressure is released. When the liquid level in the pressure relief buffer tank (1) rises above the overpressure conductivity meter (3), the value of the overpressure conductivity meter (3) changes, thereby outputting a pressure relief alarm signal at the metering pump outlet. As the solution in the pressure relief buffer tank (1) continues to rise, the pressure at the bottom of the pressure relief buffer tank (1) continues to increase. When the pressure at the bottom of the pressure relief buffer tank (1) is greater than the opening pressure of the vent check valve (6), the vent check valve (6) opens, and the solution in the pressure relief buffer tank (1) flows into the floor drain, preventing the pressure relief buffer tank (1) from being filled and failing in a short time.

2. The diaphragm metering pump anti-diaphragm rupture alarm method according to claim 1, characterized in that, Also includes: Before the diaphragm metering pump anti-diaphragm rupture alarm device is operated, a portion of the transport solution is first added to the emergency replenishment tank (2) through the injection shut-off valve (7). After the emergency replenishment tank (2) is filled, the injection shut-off valve (7) is closed. At this time, the liquid loss conductivity meter (4) displays the normal conductivity value when there is solution in the emergency replenishment tank (2). Adjust the opening pressure of the pressure relief check valve (5) to 1.1-1.2 times the operating pressure of the metering pump.

3. The diaphragm metering pump anti-diaphragm rupture alarm method according to claim 1, characterized in that, Adjust the opening pressure of the vent check valve (6) so that the vent check valve (6) can open when there is 1 / 3 solution in the pressure relief buffer tank (1).

4. The diaphragm metering pump anti-diaphragm rupture alarm method according to claim 1, characterized in that, The third opening of the metering pump inlet quick-connect tee (10) is connected to the liquid pipeline from the solution tank.

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