A centrifugal pump device with self-priming water pumping function and a self-priming water pumping method

Abstract

The present invention discloses a centrifugal pump device with a self-priming water pumping function, comprising an air pumping device, a centrifugal pump and an airtight connecting chamber, wherein the airtight connecting chamber has a drain port, a first one-way check valve is arranged in the drain port, and the first one-way check valve only allows fluid to be discharged from the airtight connecting chamber, and the air inlet of the air pumping device and the water outlet of the centrifugal pump are connected through the airtight connecting chamber. The centrifugal pump device realizes the self-priming water pumping function of the centrifugal pump, has the characteristics of high working efficiency and long service life, and the centrifugal pump is not restricted by the use environment, does not need to be placed in water, and is more convenient to use and maintain. The present invention also discloses a self-priming water pumping method of a centrifugal pump.

Description

Technical Field

[0001] The invention relates to the field of water pumps, and in particular to a centrifugal pump device with a self-priming water pumping function and a self-priming water pumping method. Background Art

[0002] In the prior art, there are roughly two types of water pumps that are used more frequently, one is a centrifugal pump and the other is a diaphragm pump.

[0003] The working principle of centrifugal pumps, especially micro centrifugal pumps, is to rely on a high-speed rotating motor to drive the impeller (blades) to rotate at high speed, so that the liquid generates inertial centrifugal force under high-speed rotation. Under the action of centrifugal force, one side of the impeller continuously sucks in the liquid, and the other side continuously discharges the liquid, forming a continuous pumping operation. Since centrifugal pumps cannot pump water through the air, their pump chambers and inlet pipes must be filled with liquid media before use to prevent cavitation. Therefore, centrifugal pumps must be placed in water when in use (so they are also called submersible pumps) to prevent the motor from idling and burning. Centrifugal pumps are generally made of brushless motors, which have the characteristics of high working efficiency and long service life, but the disadvantages are that the use environment is restricted, the use and maintenance are inconvenient, and there is no self-priming pumping function.

[0004] Diaphragm pumps are divided into two types: motor-driven and electromagnetic-driven. Regardless of whether it is motor-driven or electromagnetic-driven, its structure is composed of two parts: the power end and the fluid end (pump chamber). The power end causes the diaphragm in the pump chamber to reciprocate through a connecting device (or connecting mechanism), thereby changing the volume of the pump chamber. The pump chamber is provided with a suction valve and a discharge valve. The fluid is compressed during the reciprocating motion of the diaphragm, and the closing and cutting effect of the suction valve and the discharge valve are used to form a continuous pumping operation. The diaphragm pump can be used as both a water pump and an air pump. Therefore, as a water pump, it has a self-priming pumping function and can be placed outside the water when in use. However, the disadvantage is that the diaphragm is made of silicone rubber, which is very easy to wear out during high-speed reciprocating motion and stop working. Therefore, the life of the diaphragm pump is short and it is not suitable for long-term use. Summary of the invention

[0005] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides a centrifugal pump device, which realizes the self-priming water pumping function of the centrifugal pump, has the characteristics of high working efficiency and long service life, and the centrifugal pump is not restricted by the use environment and does not need to be placed in water, so it is more convenient to use and maintain.

[0006] The invention also provides a self-priming water pumping method of a centrifugal pump.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] A centrifugal pump device with a self-priming water pumping function comprises an air suction device, a centrifugal pump and an airtight connecting chamber, wherein the airtight connecting chamber has a drain port, a first one-way check valve is arranged in the drain port, and the first one-way check valve only allows fluid to be discharged from the airtight connecting chamber, and the air inlet of the air suction device and the water outlet of the centrifugal pump are connected through the airtight connecting chamber.

[0009] Furthermore, it also includes a first pipeline, a second pipeline and a third pipeline; the first pipeline is connected to the drain port of the airtight connecting chamber to allow the liquid in the airtight connecting chamber to be discharged outward; the second pipeline is connected between the air inlet of the air pumping device and the exhaust port of the airtight connecting chamber; the third pipeline is connected to the air outlet of the air pumping device to allow the fluid extracted by the air pumping device to be discharged outward.

[0010] Furthermore, the other end of the third pipeline is directly connected to the outside, or the other end of the third pipeline is connected to the first pipeline.

[0011] Furthermore, a second one-way check valve is provided in the exhaust port connecting the airtight connecting cavity and the air extraction device, and the second one-way check valve only allows the fluid to flow from the airtight connecting cavity to the air extraction device.

[0012] Furthermore, it also includes a controller, which is electrically connected to the centrifugal pump and the air extraction device respectively to control the start and stop of the centrifugal pump and the air extraction device.

[0013] Furthermore, it also includes a liquid level sensor, which is arranged in the airtight communication cavity and is used to sense the liquid level height of the liquid in the airtight communication cavity.

[0014] Furthermore, the centrifugal pump is arranged in the airtight connecting cavity, and the water inlet of the centrifugal pump is led out from the airtight connecting cavity; or, the centrifugal pump is arranged outside the airtight connecting cavity, and the water outlet of the centrifugal pump is connected to the water inlet of the airtight connecting cavity.

[0015] Furthermore, the air extraction device is a diaphragm pump.

[0016] A self-priming water pumping method of a centrifugal pump comprises the following steps:

[0017] Step 1: extracting gas from the pump chamber of the centrifugal pump to form a negative pressure in the pump chamber of the centrifugal pump, thereby allowing liquid to enter the pump chamber of the centrifugal pump from the water inlet of the centrifugal pump under the action of the negative pressure.

[0018] Furthermore, after the liquid enters the pump chamber of the centrifugal pump, the method further comprises the following steps:

[0019] Step 2: Stop extracting the gas in the pump chamber of the centrifugal pump.

[0020] The present invention has the following beneficial effects: an air suction device is additionally provided in the centrifugal pump device, and the air in the airtight connecting cavity is extracted by the air suction device to form a negative pressure in the pump cavity of the centrifugal pump, so that the liquid enters the pump cavity of the centrifugal pump from the water inlet of the centrifugal pump under the action of the negative pressure, and then the centrifugal pump can form a continuous pumping operation for the liquid. When the liquid fills the airtight connecting cavity, the first one-way check valve automatically opens under the action of hydraulic pressure to discharge the liquid from the drain port, thereby realizing the self-priming water pumping function of the centrifugal pump, and having the characteristics of high working efficiency and long service life, and the centrifugal pump is not restricted by the use environment, does not need to be placed in water, and is more convenient to use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a centrifugal pump device provided by the present invention;

[0022] Figure 2 A schematic diagram of another centrifugal pump device provided by the present invention;

[0023] Figure 3 A schematic diagram of another centrifugal pump device provided by the present invention;

[0024] Figure 4 A step diagram of the self-priming water pumping method provided by the present invention. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0026] Embodiment 1

[0027] like Figure 1-3 As shown, a centrifugal pump device with a self-priming water pumping function includes an air suction device 1, a centrifugal pump 2 and an airtight connecting chamber 31, wherein the airtight connecting chamber 31 has a drain port, wherein a first one-way check valve 4 is arranged in the drain port, wherein the first one-way check valve 4 only allows fluid to be discharged from the airtight connecting chamber 31, and the air inlet of the air suction device 1 and the water outlet of the centrifugal pump 2 are connected via the airtight connecting chamber 31.

[0028] The centrifugal pump device is additionally provided with an air extraction device 1, through which the gas in the airtight connecting chamber 31 is extracted to form a negative pressure in the pump chamber of the centrifugal pump 2, so that the liquid 101 enters the pump chamber of the centrifugal pump 2 from the water inlet of the centrifugal pump 2 under the action of the negative pressure, and then the centrifugal pump 2 can form a continuous pumping operation for the liquid 101. When the liquid 101 fills the airtight connecting chamber 31, the first one-way check valve 4 automatically opens under the action of hydraulic pressure to discharge the liquid 101 from the drain port, thereby realizing the self-priming pumping function of the centrifugal pump 2, which has the characteristics of high working efficiency and long service life, and the centrifugal pump 2 is not restricted by the use environment and does not need to be placed in water, so it is more convenient to use and maintain.

[0029] The first one-way check valve 4 can be, but is not limited to, an umbrella valve, a flap valve, a solenoid valve, etc.

[0030] The centrifugal pump device also includes a first pipeline 5, a second pipeline 6 and a third pipeline 7; the first pipeline 5 is connected to the drain port of the airtight connecting chamber 31 to allow the liquid 101 in the airtight connecting chamber 31 to be discharged outward; the second pipeline 6 is connected between the air inlet of the suction device 1 and the exhaust port of the airtight connecting chamber 31; the third pipeline 7 is connected to the air outlet of the suction device 1 to allow the fluid extracted by the suction device 1 to be discharged outward.

[0031] like Figure 3 As shown, the other end of the third pipeline 7 can be directly connected to the outside to discharge the fluid extracted by the suction device 1 directly to the outside; since the fluid extracted by the suction device 1 may also include a portion of the liquid 101 overflowing from the airtight communication cavity 31 in addition to the gas, it is preferred that Figure 1 and 2 As shown, the other end of the third pipeline 7 is connected to the first pipeline 5, so that the gas and liquid 101 extracted by the gas extraction device 1 are passed into the first pipeline 5 and discharged uniformly.

[0032] A second one-way check valve 8 is disposed in the exhaust port connecting the airtight communication chamber 31 and the air extraction device 1 . The second one-way check valve 8 only allows the fluid to flow from the airtight communication chamber 31 to the air extraction device 1 .

[0033] The second one-way check valve 8 can be but not limited to an umbrella valve, a flap valve, a solenoid valve, etc. It should be noted that the second one-way check valve 8 is not necessary, and the exhaust port of the airtight communication chamber 31 can be directly connected to the air inlet of the air extraction device 1 .

[0034] The centrifugal pump device further comprises a controller 10 which is electrically connected to the centrifugal pump 2 and the air pumping device 1 respectively, so as to control the start and stop of the centrifugal pump 2 and the air pumping device 1 .

[0035] The controller 10 has a control switch. When the control switch is pressed, the controller 10 turns on the air extraction device 1 .

[0036] The centrifugal pump device further includes a liquid level sensor 9 , which is disposed in the airtight communication cavity 31 and is electrically connected to the controller 10 , and is used to sense the liquid level of the liquid 101 in the airtight communication cavity 31 .

[0037] The start time of the centrifugal pump 2 by the controller 10 can be determined according to specific needs. For example: when the control switch on the controller 10 is pressed, the centrifugal pump 2 can be started synchronously with the air extraction device 1. In this way, the centrifugal pump 2 is in an idling state when it is just started, and the centrifugal pump 2 forms a continuous pumping effect only after the liquid 101 fills the pump cavity of the centrifugal pump 2 under the action of negative pressure; for another example: a first predetermined time can be pre-set in the controller 10, and the centrifugal pump 2 is started only after the air extraction device 1 starts to extract air and reaches the first predetermined time; for another example: the centrifugal pump 2 is started only after the liquid 101 overflows from the water outlet of the centrifugal pump 2 into the airtight communication cavity 31 under the action of negative pressure and triggers the liquid level sensor 9.

[0038] Similarly, the controller 10 can also determine the closing time of the air extraction device 1 according to specific needs. For example, a second preset time can be pre-set in the controller 10, and the air extraction device 1 is closed after the air extraction is started and the second preset time is reached; for another example, the air extraction device 1 is closed only after the liquid 101 overflows from the water outlet of the centrifugal pump 2 into the airtight communication chamber 31 under the action of negative pressure and triggers the liquid level sensor 9.

[0039] The air extraction device 1 may be, but is not limited to, a diaphragm pump.

[0040] In one embodiment, if Figure 1 and 3 As shown, the centrifugal pump 2 is disposed in the airtight communication chamber 31 , and the water inlet of the centrifugal pump 2 is led outward from the airtight communication chamber 31 .

[0041] The centrifugal pump device also includes a housing 3, in which the isolated airtight connecting chamber 31, the first housing chamber 32 and the second housing chamber 33 are formed, the air pumping device 1 is arranged in the first housing chamber 32, the first pipeline 5, the second pipeline 6 and the third pipeline 7 are arranged in the second housing chamber 33, and the first pipeline 5 is led out from the first housing chamber 32.

[0042] In another embodiment, Figure 2 As shown, the centrifugal pump 2 is arranged outside the airtight communication chamber 31 , and the airtight communication chamber 31 has a water inlet, and the water inlet of the airtight communication chamber 31 is connected to the water outlet of the centrifugal pump 2 .

[0043] The centrifugal pump device also includes a housing 3, in which the isolated airtight connecting chamber 31, the first housing chamber 32, the second housing chamber 33 and the third housing chamber 34 are formed, the air pumping device 1 is arranged in the first housing chamber 32, the first pipeline 5, the second pipeline 6 and the third pipeline 7 are arranged in the second housing chamber 33 and the first pipeline 5 is led out from the second housing chamber 33, the centrifugal pump 2 is arranged in the third housing chamber 34 and the water inlet of the centrifugal pump 2 is led out from the third housing chamber 34.

[0044] In the above two embodiments, the other end of the third pipeline 7 can be placed in the second accommodating chamber 33 as follows: Figure 1 and 2 As shown in the first pipeline 5 or as Figure 3 As shown, it is directly led out from the first accommodating chamber 32; the parts of the second pipeline 6 and the third pipeline 7 respectively connected to the exhaust device 1 can be arranged in the first accommodating chamber 32; the controller 10 is arranged in the first accommodating chamber 32.

[0045] Embodiment 2

[0046] A self-priming water pumping method of a centrifugal pump is not limited to being applied to the centrifugal pump device described in Example 1, such as Figure 4 As shown, the following steps are included:

[0047] Step 1: extracting gas from the pump chamber of the centrifugal pump 2 to form a negative pressure in the pump chamber of the centrifugal pump 2, thereby allowing the liquid 101 to enter the pump chamber of the centrifugal pump 2 from the water inlet of the centrifugal pump 2 under the action of the negative pressure.

[0048] In step 1, a vacuum device 1 is used to extract the gas in the pump chamber of the centrifugal pump 2, and the start time of the centrifugal pump 2 can be determined according to specific needs.

[0049] For example: the centrifugal pump 2 can be started synchronously with the vacuum device 1. In this way, the centrifugal pump 2 is in an idling state when it is just started. After the liquid 101 fills the pump chamber of the centrifugal pump 2 under the action of negative pressure, the centrifugal pump 2 forms a continuous pumping effect; for another example: a first predetermined time can be set in advance, and the centrifugal pump 2 is started only after the vacuum device 1 starts to pump air and reaches the first predetermined time; for another example: a liquid level sensor 9 can be set in the airtight connecting cavity 31 that connects the air inlet of the vacuum device 1 and the water outlet of the centrifugal pump 2, and the centrifugal pump 2 is started only after the liquid 101 overflows from the water outlet of the centrifugal pump 2 into the airtight connecting cavity 31 under the action of negative pressure and triggers the liquid level sensor 9.

[0050] Step 2: Stop extracting the gas in the pump chamber of the centrifugal pump 2.

[0051] In step 2, the air extraction device 1 is closed to stop the air extraction. The closing time of the air extraction device 1 can also be determined according to specific needs.

[0052] For example: a second preset time can be set in advance, and the vacuum device 1 is closed after the vacuum is started and the second preset time is reached; for another example: a liquid level sensor 9 can be set in the airtight connecting cavity 31 that connects the air inlet of the vacuum device 1 and the water outlet of the centrifugal pump 2, and the vacuum device 1 is closed only after the liquid 101 overflows from the water outlet of the centrifugal pump 2 into the airtight connecting cavity 31 under the action of negative pressure and triggers the liquid level sensor 9.

[0053] The above-mentioned embodiments merely express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. Any technical solution obtained in the form of equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A centrifugal pump device with self-priming water pumping function, characterized in that: The invention comprises an air extraction device, a centrifugal pump and an airtight communication chamber, wherein the airtight communication chamber has a drain port, a first one-way check valve is arranged in the drain port, and the first one-way check valve only allows fluid to be discharged from the airtight communication chamber, and the air inlet of the air extraction device and the water outlet of the centrifugal pump are connected through the airtight communication chamber; The centrifugal pump device further comprises a first pipeline, a second pipeline and a third pipeline; the first pipeline is connected to the drain port of the airtight communication cavity so as to allow the liquid in the airtight communication cavity to be discharged outward; The second pipeline is connected between the air inlet of the air extraction device and the exhaust port of the airtight communication chamber; the third pipeline is connected to the air outlet of the air extraction device so as to allow the fluid extracted by the air extraction device to be discharged outwardly; a second one-way check valve is arranged in the exhaust port connected between the airtight communication chamber and the air extraction device, and the second one-way check valve only allows the fluid to flow from the airtight communication chamber to the air extraction device; The centrifugal pump is arranged in the airtight communication cavity, the water inlet of the centrifugal pump is led outward from the airtight communication cavity, and the water outlet of the airtight communication cavity is located above the centrifugal pump.

2. The centrifugal pump device with self-priming water pumping function according to claim 1, characterized in that: The other end of the third pipeline is directly connected to the outside, or the other end of the third pipeline is connected to the first pipeline.

3. The centrifugal pump device with self-priming water pumping function according to claim 1, characterized in that: The device also includes a controller which is electrically connected to the centrifugal pump and the air extraction device respectively to control the start and stop of the centrifugal pump and the air extraction device.

4. The centrifugal pump device with self-priming water pumping function according to claim 1, characterized in that: It also includes a liquid level sensor, which is arranged in the airtight communication cavity and is used to sense the liquid level height of the liquid in the airtight communication cavity.

5. The centrifugal pump device with self-priming water pumping function according to claim 1, characterized in that: The air extraction device is a diaphragm pump.

6. A self-priming water pumping method of a centrifugal pump, characterized in that: For the centrifugal pump device according to claim 1; the self-priming water pumping method comprises the following steps: Step 1: extracting gas from the pump chamber of the centrifugal pump to form a negative pressure in the pump chamber of the centrifugal pump, thereby allowing liquid to enter the pump chamber of the centrifugal pump from the water inlet of the centrifugal pump under the action of the negative pressure.

7. The self-priming water pumping method of a centrifugal pump according to claim 6, characterized in that: After the liquid enters the pump chamber of the centrifugal pump, the method further comprises the following steps: Step 2: Stop extracting the gas in the pump chamber of the centrifugal pump.

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