Anti-cavitation stretching type vortex electric pump

Abstract

The utility model provides an anti-cavitation stretching type vortex electric pump, belongs to the field of submersible pumps, and solves the problem that a vortex pump has a cavitation phenomenon in the working process. A pressure regulating chamber is mounted at one end of the machine barrel, a ventilation opening and an inner concave part are formed in the pressure regulating chamber, a pressure regulating device is mounted in the pressure regulating chamber, a pump cover is mounted at the other end of the machine barrel, a water suction chamber is arranged between the pump cover and the machine barrel, an impeller is mounted in the water suction chamber, and a check valve is mounted in the pump cover. The check valve is composed of a valve element and a valve frame, a swing blade, a first hook, a bearing groove and a sealing ring are arranged on the valve element, a second hook matched with the first hook is arranged on the valve frame, and a water suction chamber is arranged between the pump cover and the machine barrel. The utility model has the advantages that the check valve with limited movement is additionally arranged, and when cavitation occurs in the water suction chamber, the delivery chamber is sealed, so that water pressure is accumulated in the water suction chamber to eliminate cavitation; the pressure regulating chamber regulates air pressure in the machine barrel to prevent sealing failure caused by overlarge air pressure in the machine barrel.

Description

Technical Field

[0001] The utility model belongs to the field of submersible pumps and relates to a vortex electric pump, in particular to an anti-cavitation stretching vortex electric pump. Background Art

[0002] A vortex electric pump is a pump in which the impeller is an integral wheel disk with many small blades on the outer edge. The liquid repeatedly makes vortex motion in the blades and the flow channel of the pump body. After the liquid forms a vortex, the liquid is sucked into the pump and discharged.

[0003] Since the vortex electric pump sucks in and discharges liquid after a vortex is formed in the liquid, the pressure on the liquid is reduced in the process, and bubbles are generated at the solid-liquid interface. This phenomenon is called cavitation. The occurrence of cavitation will cause surface deformation and material erosion of objects moving relative to the liquid, and metal objects may even experience severe electrochemical corrosion. The occurrence of cavitation in the vortex electric pump will cause the water outlet pressure, head and efficiency of the pump to drop rapidly, and even cause flow interruption. The impeller will also be corroded due to cavitation, reducing its service life.

[0004] For example, an anti-freeze cracking vortex self-priming electric pump with application number 201821297644.1 includes a pump body with a pump chamber and an impeller chamber, a motor is installed in the pump body, a pressure stabilizing part is provided on the pump body, a pressure stabilizing groove communicated with the pump body is opened on the pressure stabilizing part, a pressure stabilizing cover plate is installed on the pressure stabilizing groove by bolts, when water in the pump body freezes, the volume expands, the water flow squeezes the pressure stabilizing cover plate, and the pressure stabilizing cover plate increases the volume expanded when the water freezes by deformation; the provision of bolts facilitates the replacement of the pressure stabilizing cover plate.

[0005] The above patent prevents the pump body from freezing and cracking when water freezes by setting a pressure-stabilizing cover plate. However, during normal operation, the vortex pump is prone to cavitation, which makes the impeller susceptible to cavitation erosion and reduces its service life. At the same time, the occurrence of cavitation will cause the vortex pump's water outlet pressure, head and efficiency to drop rapidly, resulting in reduced water output or even interruption of flow. Utility Model Content

[0006] The utility model aims to solve the above problems in the prior art and provides a stretch-type vortex electric pump which resists cavitation by adjusting the internal pressure.

[0007] The utility model can be implemented through the following technical scheme: an anti-cavitation stretching vortex electric pump comprises a barrel, a motor and a bearing seat are installed in the barrel, a rotating shaft is installed in the motor, a pressure regulating chamber is arranged at one end of the barrel, a vent is opened at the pressure regulating chamber, an inner concave portion is arranged on the outer surface of the pressure regulating chamber, a pressure regulating device is installed in the pressure regulating chamber, a pump cover is arranged at the other end of the barrel, an extrusion chamber is opened in the pump cover, a check valve is installed in the extrusion chamber, a water absorption chamber is installed between the pump cover and the barrel, and an impeller is installed in the water absorption chamber.

[0008] In the above-mentioned anti-cavitation stretch-type vortex electric pump, the check valve is composed of a valve core and a valve frame, the valve core is provided with a swing blade, the swing blade is provided with a first hook, and the valve frame is provided with a second hook.

[0009] In the above-mentioned anti-cavitation stretch-type vortex electric pump, the swing blade is arranged to be inclined toward the center axis of the valve core.

[0010] In the above-mentioned anti-cavitation stretch-type vortex electric pump, a receiving groove is provided on the valve core, and a sealing ring is installed on the outer surface of the valve core.

[0011] In the above-mentioned anti-cavitation stretch-type vortex electric pump, a step is formed between the hook 1 and the valve core.

[0012] In the above-mentioned anti-cavitation stretching vortex electric pump, the pressure regulating device is composed of an expansion sleeve, a base and a retaining spring, the expansion sleeve is made of rubber, and a plurality of vent holes are provided on the base.

[0013] In the above-mentioned anti-cavitation stretch-type vortex electric pump, a plurality of convex rings are arranged on the expansion sleeve, and the convex rings are fitted with the inner concave portion.

[0014] In the above-mentioned anti-cavitation stretching vortex electric pump, a flat key is installed at the impeller end of the rotating shaft, and the pressure regulating chamber end of the rotating shaft extends into the bearing seat, and the bearing seat is provided with a through hole.

[0015] Compared with the prior art, the utility model has the following advantages: a check valve is arranged in the extrusion chamber of the pump cover. When cavitation occurs in the water suction chamber, the water outlet pressure, lift and efficiency of the water pump drop rapidly. The valve core of the check valve is affected by the water pressure of the water flow in the extrusion chamber and is squeezed against the valve body, thereby blocking the delivered water flow in the water suction chamber. When the water pressure is greater than the water pressure in the extrusion chamber, the water flow pushes open the valve core and starts to deliver water. At the same time, the cavitation disappears due to the increase in water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of an anti-cavitation stretching vortex electric pump;

[0017] Figure 2 yes Figure 1 Enlarged view of inner circle A;

[0018] Figure 3 yes Figure 1 Enlarged view of inner circle B;

[0019] Figure 4 yes Figure 1 Enlarged view of the inner circle C;

[0020] Among them, 1. barrel; 11. bearing seat; 111. through hole; 2. motor; 3. rotating shaft; 31. flat key; 4. pressure regulating chamber; 41. vent; 42. inner recess; 5. pressure regulating device; 51. expansion sleeve; 511. convex ring; 52. base; 521. vent; 53. retaining ring; 6. pump cover; 61. extrusion chamber; 7. check valve; 71. valve core; 711. swing blade; 711a, hook one; 712. receiving groove; 713. sealing ring; 714. step; 72. valve frame; 721. hook two; 8. water suction chamber; 81. impeller. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figures 1 to 4 As shown, the utility model can be implemented through the following embodiments: an anti-cavitation stretching vortex electric pump includes a barrel 1, a motor 2 and a bearing seat 11 are installed in the barrel 1, a rotating shaft 3 is installed in the motor 2, a pressure regulating chamber 4 is provided at one end of the barrel 1, a vent 41 is opened at the pressure regulating chamber 4, an inner recess 42 is provided on the outer surface of the pressure regulating chamber 4, a pressure regulating device 5 is installed in the pressure regulating chamber 4, a pump cover 6 is provided at the other end of the barrel 1, an extrusion chamber 61 is opened in the pump cover 6, a check valve 7 is installed in the extrusion chamber 61, a water absorption chamber 8 is installed between the pump cover 6 and the barrel 1, and an impeller 81 is installed in the water absorption chamber 8.

[0023] The pressure regulating chamber 4 is connected to the outside atmosphere through the vent 41, and the atmospheric pressure in the barrel 1 is controlled by the change of the pressure regulating device 5 to prevent the pressure difference between the water absorption chamber 8 and the barrel 1 from being too large, which may cause the sealing of the barrel 1 to be destroyed. The inner recess 42 is used to engage with the pressure regulating device 5; the extrusion chamber 61 in the pump cover 6 is equipped with a check valve 7, which is used to adjust the water pressure in the water absorption chamber 8 and prevent the water flowing out of the water pump from flowing back into the water absorption chamber 8. The impeller 81 is used to stir the water flow to form a vortex.

[0024] like Figure 1 and Figure 2As shown, the check valve 7 is composed of a valve core 71 and a valve frame 72. The valve core 71 is provided with a swing leaf 711, the swing leaf 711 is provided with a hook 1 711a, and the valve frame 72 is provided with a hook 2 721. The setting of the swing leaf 711 allows a movable space between the valve core 71 and the valve frame 72. The swing leaf 711, the hook 1 711a and the hook 2 721 cooperate to prevent the valve core 71 from leaving the valve frame 72.

[0025] like Figure 1 and Figure 2 As shown, the swing blade 711 is arranged obliquely toward the center axis of the valve core 71. The swing blade 711 is inclined toward the inside of the valve core 71, so that the water flow pushes the swing blade 711 to pass through the check valve 7, which is convenient for the vortex electric pump to transport the water flow.

[0026] like Figure 1 and Figure 2 As shown, a receiving groove 712 is provided on the valve core 71, and a sealing ring 713 is installed on the outer surface of the valve core 71. The receiving groove 712 is used to withstand the water pressure at the water outlet of the water pump, so that the water pressure squeezes the valve core 71 toward the valve frame 72, prompting the sealing ring 713 to seal the check valve 7, so that the water absorption chamber 8 accumulates water flow and increases the water pressure.

[0027] like Figure 1 and Figure 2 As shown, a step 714 is formed between the hook 1 711a and the valve core 71. The setting of the step 714 allows the valve core 71 to fit the valve frame 72, and a buffer exists between the sealing ring 713 and the valve frame 72, thereby improving the sealing performance.

[0028] like Figure 1 and Figure 4 As shown, the pressure regulating device 5 is composed of an expansion sleeve 51, a base 52 and a retaining spring 53. The expansion sleeve 51 is made of rubber, and a plurality of vents 521 are provided on the base 52. The expansion sleeve 51 is used to expand or contract after the air pressure in the barrel 1 changes, so as to keep the air pressure in the barrel 1 constant; the base 52 serves as the skeleton of the expansion sleeve 51 to prevent the expansion sleeve 51 from falling off when the pressure changes, and the vents 521 are used to connect the outside atmosphere and the expansion sleeve 51; the retaining spring 53 clamps the base 52 and the expansion sleeve 51 at the inner recess 42 to prevent the base 52 and the expansion sleeve 51 from falling off, and the expansion sleeve 51 isolates the outside atmosphere and the barrel 1, and prevents foreign impurities from entering the barrel 1.

[0029] like Figure 1 and Figure 4 As shown, the expansion sleeve 51 is provided with a plurality of convex rings 511, and the convex rings 511 fit the inner recess 42. The provision of the convex rings 511 improves the sealing between the expansion sleeve 51 and the inner recess 42, and the provision of the convex rings 511 is conducive to preventing the expansion sleeve 51 from falling.

[0030] like Figure 1 and Figure 3As shown, a flat key 31 is installed at the impeller 81 end of the rotating shaft 3, and the pressure regulating chamber 4 end of the rotating shaft 3 extends into the bearing seat 11, and the bearing seat 11 is provided with a through hole 111. The flat key 31 is provided for the rotating shaft 3 to transmit torque to the impeller 81, and the through hole 111 provided on the bearing seat 11 allows air to circulate between the pressure regulating chamber 4 and the barrel 1, so that the pressure regulating device 5 can adjust the air pressure in the barrel 1.

[0031] The working principle of the utility model is as follows: after the vortex electric pump is started, the impeller 81 works, and the water flow pushes open the swing blade 711 of the valve core 71 of the check valve 7 and flows out from the pressure chamber 61. With the generation of the vortex and the outflow of the water flow, the water pressure in the water suction chamber 8 drops and cavitation occurs. The occurrence of the cavitation phenomenon causes the water outlet pressure, lift and efficiency of the vortex electric pump to drop, making it difficult for the water flow in the pressure chamber 61 and the water outlet pipe to flow out. After the water flow reverses, it is blocked by the check valve 7, and the valve core 71 blocks the valve frame 72. Due to insufficient water pressure in the water suction chamber 8, the water pressure in the pressure chamber 61 is broken through. As the water suction chamber 8 continuously absorbs water, the water pressure in the water suction chamber 8 rises, the cavitation phenomenon disappears, the water outlet pressure, lift and efficiency of the vortex electric pump recover, and the water flow pushes open the valve core 71 to operate again.

[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0033] Although various terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An anti-cavitation stretching vortex electric pump, comprising a barrel (1), a motor (2) and a bearing seat (11) being installed in the barrel (1), a rotating shaft (3) being installed in the motor (2), characterized in that: A pressure regulating chamber (4) is provided at one end of the barrel (1), a vent (41) is provided at the pressure regulating chamber (4), an inner recess (42) is provided on the outer surface of the pressure regulating chamber (4), a pressure regulating device (5) is installed in the pressure regulating chamber (4), a pump cover (6) is provided at the other end of the barrel (1), an extrusion chamber (61) is provided in the pump cover (6), a check valve (7) is installed in the extrusion chamber (61), a water suction chamber (8) is installed between the pump cover (6) and the barrel (1), and an impeller (81) (81) is installed in the water suction chamber (8).

2. The anti-cavitation stretching vortex electric pump according to claim 1, characterized in that: The check valve (7) is composed of a valve core (71) and a valve frame (72); the valve core (71) is provided with a swing blade (711); the swing blade (711) is provided with a hook 1 (711a); and the valve frame (72) is provided with a hook 2 (721).

3. The anti-cavitation stretching vortex electric pump according to claim 2, characterized in that: The swing blade (711) is arranged obliquely toward the center axis of the valve core (71).

4. The anti-cavitation stretching vortex electric pump according to claim 2, characterized in that: The valve core (71) is provided with a receiving groove (712), and a sealing ring (713) is installed on the outer surface of the valve core (71).

5. The anti-cavitation stretching vortex electric pump according to claim 2, characterized in that: A step (714) is formed between the hook 1 (711a) and the valve core (71).

6. The anti-cavitation stretching vortex electric pump according to claim 1, characterized in that: The pressure regulating device (5) is composed of an expansion sleeve (51), a base (52) and a retaining spring (53); the expansion sleeve (51) is made of rubber, and the base (52) is provided with a plurality of vent holes (521).

7. The anti-cavitation stretching vortex electric pump according to claim 6, characterized in that: The expansion sleeve (51) is provided with a plurality of convex rings (511), and the convex rings (511) are fitted with the inner concave portion (42).

8. The anti-cavitation stretching vortex electric pump according to claim 1, characterized in that: A flat key (31) is installed at the impeller (81) (81) end of the rotating shaft (3), and the pressure regulating chamber (4) end of the rotating shaft (3) extends into the bearing seat (11). The bearing seat (11) is provided with a through hole (111).

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