Water supplementing tank device and water supply system

Abstract

The invention provides a water replenishing tank device and a water supply system.The water replenishing tank device comprises a water replenishing tank, a water inlet pipeline, a water outlet pipeline and an exhaust pipe, and the water replenishing tank is provided with an exhaust port; the water supplementing tank is connected with the water inlet pipeline and the water outlet pipeline, the water inlet pipeline is used for supplying water to the water supplementing tank, and the water outlet pipeline is used for being connected with the water inlet end of the centrifugal pump. The water outlet pipeline is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is arranged on the upper portion in the water supplementing tank. By arranging the exhaust pipe, the water replenishing frequency of the water replenishing tank can be effectively reduced, and exhaust does not need to depend on automatic equipment.

Description

Technical Field

[0001] The invention relates to the field of centrifugal pump water supply systems, and in particular to a water replenishment tank device and a water supply system. Background Art

[0002] Centrifugal pumps rely on the high-speed rotation of the impeller to generate centrifugal force, which throws the liquid from the center to the outer edge, forming a low-pressure area to suck in the liquid.

[0003] In the centrifugal pump system, the water tank (often called a pressure tank or expansion tank) is a key component to ensure the stable operation of the pump, and its role is closely related to the working characteristics of the centrifugal pump. The water tank can reduce the exhaust action before starting the pump and can start the pump directly, which is widely used. Because the pump shaft packing or other small air gaps leak air and water, in order to ensure the reliable start of the water tank, an external automation system or manual water replenishment is required. The frequency of water replenishment is high, and the increase of automation system increases the risk of system failure. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a water replenishment tank device and a water supply system, which can automatically remove the gas in the water replenishment tank as the centrifugal pump works, thereby reducing the frequency of independent water replenishment operations on the water replenishment tank.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a water replenishment tank device is provided, comprising a water replenishment tank, a water inlet pipe, a water outlet pipe, and an exhaust pipe, wherein the water replenishment tank is provided with an exhaust port; the water replenishment tank is connected to the water inlet pipe and the water outlet pipe, the water inlet pipe is used to supply water to the water replenishment tank, and the water outlet pipe is used to connect to the water inlet end of a centrifugal pump; the water outlet pipe is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is arranged at the upper part of the water replenishment tank.

[0007] In some embodiments of the present application, the other end of the exhaust pipe is arranged at the upper part of the water replenishment tank near the top.

[0008] In some embodiments of the present application, the diameter of the exhaust pipe is 25-50 mm.

[0009] In some embodiments of the present application, one end of the exhaust pipe connected to the water outlet pipe extends into the water outlet pipe.

[0010] In some embodiments of the present application, the exhaust pipe extends into the water outlet pipe to form an air outlet section, and the angle between the air outlet section and the water flow direction in the water outlet pipe is 0-15°.

[0011] In some embodiments of the present application, the water inlet pipe is connected to the upper part of the water replenishment tank and extends into the lower part of the water replenishment tank.

[0012] In some embodiments of the present application, in the water replenishment tank, an air hole is provided on the upper portion of the water inlet pipe.

[0013] In some embodiments of the present application, the air hole is arranged near the wall of the water replenishment tank.

[0014] In some embodiments of the present application, the pores have a diameter of 3-5 mm.

[0015] In a second aspect, a water supply system is provided, comprising: any one of the above-mentioned water replenishment tank devices and a centrifugal pump connected to a water outlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides that the frequency of water replenishment in the water replenishment tank can be effectively reduced by arranging an exhaust pipe, and there is no need to rely on automated equipment for exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the water supply system;

[0019] Figure 2 This is a schematic diagram of a traditional water replenishment tank device;

[0020] Figure 3 This is a schematic diagram of the water inlet lifting height of the water supply system;

[0021] Figure 4 This is a schematic diagram of the initial pump stop state 1 of the water supply system;

[0022] Figure 5 This is a schematic diagram of the initial pump stop state 2 of the water supply system.

[0023] In the figure:

[0024] Water replenishment tank 1, water inlet pipe 2, air hole 3, water outlet pipe 4, exhaust port 5, exhaust pipe 6, air outlet section 7, centrifugal pump 8. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] When the water replenishment tank 1 is filled with water for the first time, the gas in the water replenishment tank 1 itself also needs to be discharged, otherwise the liquid level in the tank cannot rise after reaching a certain height, so it is necessary to add an exhaust port for exhaust. During normal operation, the water replenishment tank 1 will bring in gas as the supplied water enters, and then gathers at the top of the water replenishment tank, and the gas enters the tank body from the gap of the centrifugal pump due to the pump being stopped. If too much gas gathers, it will cause the liquid level in the water replenishment tank 1 to be low. The existing water replenishment tank 1 needs to be vented and replenished with water to maintain a suitable liquid level so as to facilitate the operation of the centrifugal pump. The exhaust is automatically or manually exhausted through the exhaust port set on the top of the tank body. However, with the increase of gas caused by factors such as water supply, it is necessary to exhaust and replenish water multiple times, resulting in a high frequency of replenishment, especially with the addition of an automated exhaust system. As the number of exhaust and replenishment increases, the risk of system failure will also increase.

[0030] When the centrifugal pump is stopped, water will leak out from the packing of the pump main shaft, and air will actually leak into the pump at the same time; when the pump is running, the packing structure of the centrifugal pump will inject water with sealing water pressure, so there will be no leakage into the pump body at this time. Because there is a height difference between the liquid level and the centrifugal pump, when the centrifugal pump is stopped, water will leak in due to the height difference of the liquid level.

[0031] Every time the pump runs, there is a large amount of air in the tank, and every time the pump is stopped, more air will leak into the tank. After stopping the pump several times, the air in the tank increases significantly, causing the water level in the tank to be low. At this time, the pump is started. When the water in the tank is emptied, the volume of the air in the tank increases due to the pressure reduction, and it may not be completely filled with water. At this time, the siphon principle cannot be used, and the water in the water inlet pipe 2 is continuously pressed into the tank. At this time, the centrifugal pump can only pump air but not water. The centrifugal pump has a very poor ability to exhaust air, which leads to startup failure. Therefore, it is necessary to vent the water tank 1.

[0032] Refer to the attached Figure 1 As shown, in the first aspect, a water replenishment tank device is provided, including a water replenishment tank 1, a water inlet pipe 2, a water outlet pipe 4, and an exhaust pipe 6, wherein the water replenishment tank 1 is provided with an exhaust port 5; the water replenishment tank 1 is connected to the water inlet pipe 2 and the water outlet pipe 4, the water inlet pipe 2 is used to supply water to the water replenishment tank 1, and the water outlet pipe 4 is used to connect the water inlet end of the centrifugal pump 8; the water outlet pipe 4 is connected to one end of the exhaust pipe 6, and the other end of the exhaust pipe 6 is arranged at the upper part of the water replenishment tank 1. When the water replenishment tank 1 is replenished with water for the first time by other means, the exhaust port 5 is opened for exhaust, so as to facilitate the water replenishment operation to the water replenishment tank 1. During normal operation, the exhaust port 5 is always in a closed state, including starting and stopping the pump in the later stage.

[0033] When the centrifugal pump 8 is started for the first time, the water replenishment tank 1 needs to have a certain liquid level, so it is necessary to fill the water replenishment tank 1 with water in advance. At this time, manual exhaust is required to facilitate the water replenishment operation. The above implementation scheme can gradually remove the air in the tank body during the operation of the centrifugal pump, without the need for further automatic or manual exhaust of the air in the tank body, thereby reducing the frequency of water replenishment in the tank body. That is, during the use process, if the centrifugal pump causes the air space in the tank to increase due to reasons such as air leakage in the packing and air brought by the water inlet pipe, in the subsequent normal operation of the centrifugal pump, this part of the air will be slowly taken away with the liquid flow through the exhaust pipe 6. Because the vacuum state cannot be achieved, there will be a small amount of air, so that the tank always maintains this dynamic process.

[0034] In a specific implementation manner, the other end of the exhaust pipe 6 is disposed at the upper portion of the water replenishment tank 1 near the top, so that air enters the exhaust pipe 6 from a high position, thereby increasing the liquid level in the tank.

[0035] In a specific implementation, the diameter of the exhaust pipe 6 is preferably a size that matches the water replenishment tank 1. For example, a small tank can use a commercially available 1-inch pipe with a size of 25mm; a large tank can use a commercially available 2-inch pipe with a size of 50mm; or a smaller size such as 10mm, 20mm, etc., or a larger size such as 60mm, 80mm, etc., or a size in the middle of 30mm, 45mm, etc. can be selected as needed. According to actual conditions, a pipe of a commonly available size that is easily available can be selected. Specifically, a size of 25-50mm can be selected.

[0036] In a specific implementation manner, one end of the exhaust pipe 6 is connected to the water outlet pipe 4 and extends into the water outlet pipe 4 .

[0037] In a specific implementation, the exhaust pipe 6 extends into the outlet pipe 4 to form an outlet section 7, the outlet direction of the outlet section 7 is adapted to the water flow direction, and the angle between the outlet section 7 and the water flow direction in the outlet pipe 4 is 0-15°. Based on the actual installation situation, such as installation process, installation position and other factors, 0°, 5°, 7°, 10°, 13°, and 15° can be selected. The best is to select 0°, which is parallel to the water flow direction, for the best effect.

[0038] In the conventional solution, the water inlet pipe 2 enters the water replenishment tank 1 from the upper part or top of the water replenishment tank 1 or extends from the bottom to the upper part or top of the water replenishment tank 1, and the water outlet supplies water from the upper part or top of the water replenishment tank 1. Figure 2 As shown, the water inlet lifting height of the centrifugal pump during actual operation is h+ΔNPSHa. Increasing the water inlet lifting height of the centrifugal pump is likely to cause cavitation, low operating efficiency and other phenomena, which is not conducive to exerting the performance of the centrifugal pump 8.

[0039] However, if the centrifugal pump is to be guaranteed to perform stably, the actual installation position needs to be lowered, which will affect the maximum installation height of the pump.

[0040] In a specific implementation manner, the water inlet pipe 2 is connected to the upper part of the water replenishment tank 1 and extends into the lower part of the water replenishment tank 1. Figure 3 As shown, compared with the centrifugal pump 8 directly delivering water from the pool, the lifting height is h. By adopting the solution of the present application, ignoring the slight resistance of the elbow and the total length of the water inlet pipe 2, the centrifugal pump water inlet lifting height is h, and the centrifugal pump water inlet lifting height remains unchanged. Figure 2 ΔNPSHa+h in the present invention, the suction height of the centrifugal pump 8 is Figure 2 The h in.

[0041] In a specific implementation, in the water replenishment tank 1, the upper part of the water inlet pipe 2 is provided with air holes 3, and the air brought in by the water inlet pipe 2 will diffuse from the air holes 3 to the top of the water replenishment tank 1 and gather, and enter the centrifugal pump 8 along the exhaust pipe 6 and be discharged out of the tank body, so that the gas at the top of the water replenishment tank 1 can be maintained in a dynamically changing space. The air holes 3 can be evenly arranged on the upper part of the water inlet pipe 2, such as evenly arranged circumferentially.

[0042] In a specific implementation manner, the air hole 3 is arranged near the wall of the water replenishment tank 1, that is, when water enters the tank body, the contained air can be allowed to overflow from the air hole 3 as quickly as possible. At the same time, when the pump is started, the air in the water inlet pipe 2 can also be pumped away by the pump through the exhaust pipe 6 more quickly, thereby better filling the water inlet pipe 2 with water and entering the water replenishment tank 1.

[0043] In a specific implementation manner, the diameter of the pores 3 is 3-5 mm.

[0044] In a second aspect, a water supply system is provided, comprising: any of the above-mentioned water replenishment tank devices and a centrifugal pump 8 connected to a water outlet pipe 4 .

[0045] Here’s how it works:

[0046] Initial state: At initial installation, the tank is filled with air; add water from the top water supply valve, fill the tank with water, and close the water supply valve.

[0047] Initial start of the pump: 1) Start the pump directly, the liquid level in the tank drops, and the liquid level in the water inlet pipe 2 rises; 2) The air in the water inlet pipe 2 enters the top of the tank through the air hole 3 on the pipe wall, and the liquid level in the tank begins to drop; 3) The liquid level in the tank continues to drop until the water inlet pipe 2 is completely filled with water. Since most of the water inlet pipe 2 enters the tank through the lower part of the pipe, the air hole 3 on the pipe wall produces flow resistance due to its small hole, and only a small amount of water flows out. When the flow rate of the pipe is high, a small airflow is brought into the water flow of the water inlet pipe 2. 4) At the same time, applying the Venturi tube principle, the exhaust pipe 6 generates a local low pressure due to the flow rate at the pipe mouth, and the liquid in the pipe is taken away. Then the air connected to the top of the tank begins to be discharged through the exhaust pipe 6, gradually to the top of the exhaust pipe 6.

[0048] Initial pump shutdown: 1) At the initial stage of pump shutdown, the tank is filled with water, the water inlet pipe maintains a liquid level difference, and the liquid level in the tank remains unchanged; 2) Due to the filler or other tiny air gaps, the centrifugal pump leaks under the action of the ΔH pressure difference, and air enters the tank and accumulates at the top of the tank, and the liquid level in the tank begins to drop. Figure 4 As shown; 3) The liquid level in the tank drops to the air hole 3 of the water inlet pipe 2; 4) The air on the tank top enters the pipe from the air hole 3, the liquid level in the tank maintains this level, and the liquid level in the water inlet pipe 2 continues to drop; 5) The liquid level in the tank remains unchanged, and the liquid level in the water inlet pipe 2 continues to drop until it is level with the liquid level in the water inlet pool; 6) Due to the centrifugal pump packing or other tiny air gaps, there is a pressure difference of Δh between the liquid level in the tank and the air gap of the centrifugal pump due to pump shutdown. When the pressure difference is greater than the resistance at the air gap, water begins to leak out from the air gap, and the liquid level in the tank drops until the pressure difference of the liquid surface is equal to the flow resistance at the air gap and no longer flows, as shown Figure 5 shown.

[0049] When the centrifugal pump stops running, the centrifugal pump and the water supply tank 1 act as a sealed whole. The height difference between the water supply tank and the liquid level in the water supply tank will generate a negative pressure of ΔH in the tank. This negative pressure will accelerate the centrifugal pump that is leaking, and the leakage will be faster.

[0050] Start the pump again: 1) Start the pump, the liquid level in the tank drops, and the liquid level in the water inlet pipe 2 rises; 2) The liquid level in the tank drops until the water inlet pipe 2 is completely filled with water, and the liquid level stops dropping; 3) The air at the top of the tank passes through the exhaust pipe 6 and is slowly carried away by the water flow due to the Venturi tube principle, and the liquid level in the tank begins to rise slowly; 4) The liquid level in the tank rises to the top of the exhaust pipe 6.

[0051] The components or structural connections of this application are not fully shown in the figure, and they can all be connected using the connection methods in the art. The application does not explicitly state that the application does not limit the use of the prior art. The screws and mounting holes for installation are not fully shown in the figure, and those skilled in the art can set them according to the actual situation of the solution or product.

[0052] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A water replenishment tank device, characterized in that: It includes a water replenishment tank, a water inlet pipe, a water outlet pipe, and an exhaust pipe. The water replenishment tank is provided with an exhaust port; the water replenishment tank is connected to the water inlet pipe and the water outlet pipe, the water inlet pipe is used to supply water to the water replenishment tank, and the water outlet pipe is used to connect the water inlet end of the centrifugal pump; the water outlet pipe is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is arranged at the upper part of the water replenishment tank.

2. The water replenishment tank device according to claim 1, characterized in that: The other end of the exhaust pipe is arranged at the upper part of the water replenishment tank near the top.

3. The water replenishment tank device according to claim 1, characterized in that: The diameter of the exhaust pipe is 25-50 mm.

4. The water replenishment tank device according to claim 1, characterized in that: One end of the exhaust pipe connected to the water outlet pipe extends into the water outlet pipe.

5. The water replenishment tank device according to claim 4, characterized in that: The exhaust pipe extends into the water outlet pipe to form an exhaust section, and the angle between the exhaust section and the water flow direction in the water outlet pipe is 0-15°.

6. The water replenishment tank device according to claim 1, characterized in that: The water inlet pipe is connected to the upper part of the water replenishment tank and extends into the lower part of the water replenishment tank.

7. The water replenishment tank device according to claim 6, characterized in that: In the water replenishment tank, an air hole is arranged on the upper part of the water inlet pipe.

8. The water replenishment tank device according to claim 7, characterized in that: The air hole is arranged near the wall of the water replenishment tank.

9. The water replenishment tank device according to claim 7, characterized in that: The pores have a diameter of 3-5 mm.

10. A water supply system, characterized in that: include: The water replenishment tank device as described in any one of claims 1-9 and a centrifugal pump connected to the water outlet pipe.

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