Reflux hole opening and closing device of self-priming pump

Abstract

The invention relates to a self-priming pump backflow hole opening and closing device, and relates to the field of water pumps, the self-priming pump backflow hole opening and closing device comprises multiple rotating assemblies, each rotating assembly comprises a rotating blade and a driving part, the driving parts drive the rotating blades to rotate, and the multiple rotating blades rotate to change the hole diameter of a backflow hole. The method has the advantage of being high in control precision.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to a self-priming pump return hole opening and closing device. Background Art

[0002] At present, the return hole of the water pump is usually opened and closed by a simple valve structure, which cannot well control the size of the flow rate passing through the return hole. This method has certain limitations in control accuracy. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, one of the purposes of this application is to provide a self-priming pump return hole opening and closing device, which has the advantage of high control accuracy.

[0004] The above-mentioned purpose of this application is achieved through the following technical solutions:

[0005] A self-priming pump return hole opening and closing device includes multiple groups of rotating components, the rotating components include rotating blades and driving members, the driving members drive the rotating blades to rotate, and the multiple rotating blades rotate to achieve the change of the aperture of the return hole.

[0006] In a preferred example, the present application can be further configured as follows: it also includes a fixed ring and a power source, the driving member includes a transmission gear and a rotating shaft, the rotating blades and the transmission gear are both installed on the rotating shaft, the rotating shaft and the fixed ring are connected, and the power source is used to drive the transmission gear to rotate.

[0007] In a preferred example, the present application can be further configured as follows: the power source includes a motor and an aperture gear, a mating gear is installed on the motor shaft of the motor, the mating gear and the aperture gear are meshed with each other, the aperture gear and the fixed ring are rotatably connected, and the aperture gear and the transmission gear are meshed with each other.

[0008] In a preferred example, the present application can be further configured as follows: the rotating blades of the multiple rotating components are divided into two layers, upper and lower layers. When the rotating shaft rotates a certain angle, the multiple rotating blades completely cover the through hole of the fixed ring.

[0009] In a preferred example, the present application can be further configured as follows: the aperture gear is ring-shaped, the transmission gear and the inner teeth of the aperture gear are meshed with each other, and the mating gear and the outer teeth of the aperture gear are meshed with each other.

[0010] In a preferred example, the present application can be further configured as follows: the relationship between the transmission gear speed and the stepping motor speed is: Among them, n3 is the speed of the transmission gear, unit: RPM, n is the speed of the mating gear, unit: RPM, z is the number of teeth of the mating gear, z1 is the number of teeth of the outer teeth of the aperture gear, z2 is the number of teeth of the inner teeth of the aperture gear, and z3 is the number of teeth of the transmission gear.

[0011] In a preferred example, the present application can be further configured as follows: the relationship between the transmission gear speed and the end linear speed of the rotating blade is: Where n3 is the speed of the transmission gear, unit: RPM, v is the end linear velocity of the rotor blade, R is the inner diameter of the tip trajectory of the rotor blade, and the transmission ratio i from the transmission gear to the rotor blade is 3→b .

[0012] In a preferred example, the present application can be further configured as follows: the relationship between the rotation speed of the mating gear and the inner diameter of the rotor blade tip is: v is the end linear velocity of the rotating blade, R is the inner diameter of the tip trajectory of the rotating blade, n is the rotation speed of the mating gear, unit: RPM, z is the number of teeth of the mating gear, z1 is the number of teeth of the outer teeth of the aperture gear, z2 is the number of teeth of the inner teeth of the aperture gear, and z3 is the number of teeth of the transmission gear.

[0013] This application has the following advantages:

[0014] The motor drives the aperture gear to rotate, which in turn drives the transmission gear to rotate. The transmission gear drives the rotating shaft to rotate, causing the rotating blade to rotate, thereby realizing stepless opening and closing of the reflux hole and accurately adjusting the liquid flow through the reflux hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of this application.

[0016] Figure 2 This is a structural diagram from another perspective of this application.

[0017] Figure numerals: 1. Rotating assembly; 11. Rotating blade; 12. Transmission gear; 13. Rotating shaft; 2. Fixed ring; 3. Aperture gear; 4. Motor; 5. Mating gear. DETAILED DESCRIPTION

[0018] The present application is further described in detail below with reference to the accompanying drawings.

[0019] Reference Figure 1 and Figure 2 The present application discloses a self-priming pump reflow hole opening and closing device, comprising a fixed ring 2 and a power source. The fixed ring 2 is mounted at the reflow hole of the self-priming pump. The power source comprises a motor 4 and an aperture gear 3. The aperture gear 3 is annular and rotatably connected to the fixed ring 2. A mating gear 5 is mounted on the motor shaft of the motor 4, and the mating gear 5 meshes with the outer teeth of the aperture gear 3. The motor 4 can be a stepping motor.

[0020] Multiple rotating assemblies 1 are mounted on the fixed ring 2. These assemblies 1 include rotating blades 11 and a driver. The driver drives the rotating blades 11, and the rotation of the multiple rotating blades 11 changes the diameter of the return hole. The driver includes a transmission gear 12 and a rotating shaft 13. Both the rotating blades 11 and the transmission gear 12 are mounted on the rotating shaft 13. The rotating shaft 13 is connected to the fixed ring 2 and meshes with the outer teeth of the mating gear 5 and the aperture gear 3.

[0021] The rotating blades 11 of the plurality of rotating components 1 are divided into two layers, an upper layer and an lower layer. When the rotating shaft 13 rotates a certain angle, the plurality of rotating blades 11 completely cover the through hole of the fixing ring 2 .

[0022] The relationship between the transmission gear speed and the stepper motor 4 speed is: Among them, n3 is the rotation speed of the transmission gear 12, unit: RPM, n is the rotation speed of the mating gear 5, unit: RPM, z is the number of teeth of the mating gear 5, z1 is the number of teeth of the outer teeth of the aperture gear 3, z2 is the number of teeth of the inner teeth of the aperture gear 3, and z3 is the number of teeth of the transmission gear 12.

[0023] The relationship between the rotation speed of the transmission gear 12 and the end linear velocity of the rotor blade 11 is: Where n3 is the speed of the transmission gear 12, unit: RPM, v is the linear velocity of the end of the rotor blade 11, R is the inner diameter of the end track of the rotor blade 11, and the transmission ratio i from the transmission gear 12 to the rotor blade 11 is 3→b .

[0024] Calculating the relationship between the motor speed (matching gear 5 speed) n and the transmission gear 12 speed n3 includes the following steps:

[0025] Step 1: Define parameters

[0026] Motor mating gear 5: number of teeth z, module m 外 , speed n r (Unit: RPM)

[0027] Aperture gear 3:

[0028] External teeth: number of teeth z1, module m 外 , pitch circle radius:

[0029] Internal teeth: number of teeth z2, module m 内 , pitch circle radius:

[0030] Overall speed: n disk (Unit: RPM)

[0031] Transmission gear 12: number of teeth z3, module m 内 , speed n3, pitch circle radius r3

[0032] Step 2: External meshing transmission (motor gear 5 → aperture gear 3 external teeth)

[0033] Gear ratio:

[0034] Step 3: Internal meshing transmission (internal teeth of aperture gear 3 → transmission gear 12)

[0035] Gear ratio:

[0036] Step 4: Combine the formulas

[0037] n disk Substituting into n3, we get:

[0038]

[0039] Step 5: Geometric Constraints (Pitch Circle Radius Relationship)

[0040] External toothing center distance a1:

[0041] Internal toothing center distance a2:

[0042] The internal tooth pitch circle radius r2 of the aperture gear 3 must be larger than the pitch circle radius r3 of the transmission gear 12, that is:

[0043]

[0044] Finally, the relationship between the rotation speed of the transmission gear 12 and the rotation speed of the stepping motor 4 is obtained as follows:

[0045]

[0046] Calculating the relationship between the rotation speed n3 of the transmission gear 12 and the inner diameter R of the end of the rotor blade 11 includes the following steps:

[0047] Assumptions and Models

[0048] 1. Rotating blade 11 parameters:

[0049] The number of rotating blades 11 is z, and the end trajectory is approximately circular with an inner diameter of R.

[0050] The linear velocity v at the tip of the rotor blade 11 (set to a constant value by the system operating conditions).

[0051] Transmission relationship:

[0052] The transmission ratio i from the transmission gear 12 to the rotating blade 11 3→b , i.e. the rotation speed n of the rotor blade 11 b =i 3→b ·n3.

[0053] Geometric constraints:

[0054] The relationship between the linear velocity of the end of the rotor blade 11 and the rotational speed is: v = 2πR·n b

[0055] Formula derivation

[0056] Set the transmission ratio n b =i 3→b ·n3.Substitute into the linear velocity formula:

[0057] v=2πR·(i 3→b ·n3)

[0058] The solution is:

[0059]

[0060] Calculating the relationship between the motor speed n and the inner diameter R of the end of the rotor blade 11 includes the following steps:

[0061] Step 1: Establish the drive train speed relationship

[0062] Motor with gear 5: number of teeth z, speed n

[0063] Aperture gear 3: number of outer teeth z1, number of inner teeth z2, speed n disk

[0064] Transmission gear 12: number of teeth z3, speed n3

[0065] Transmission ratio relationship:

[0066]

[0067] Step 2: Relationship between the linear velocity v at the tip of the rotor blade 11 and the inner diameter R

[0068] The relationship between the angular velocity ω3 (rad / s) of the transmission gear 12 and n3 is:

[0069]

[0070] The linear velocity v of the end of the rotor blade 11 satisfies:

[0071]

[0072] Step 3: Eliminate n3 from the simultaneous equations

[0073] Will Substitute the linear velocity relationship into:

[0074]

[0075] The inner diameter R of the tip of the rotating blade 11 (the inner diameter of the aperture) is obtained as

[0076]

[0077] Therefore, assuming the return hole is circular with an inner diameter of R0:

[0078] When R>R0, the flow area at the reflux hole S=πR0 2 ;

[0079] When R≤R0, the flow area at the reflux hole S=πR 2 .

[0080] The implementation principle of this embodiment is: the motor drives the aperture gear 3 to rotate, which in turn drives the transmission gear 12 to rotate, and the transmission gear 12 drives the rotating shaft to rotate, so that the rotating blade 11 rotates, thereby realizing stepless opening and closing of the reflux hole and accurately adjusting the liquid flow through the reflux hole.

[0081] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A self-priming pump reflux hole opening and closing device, characterized by: The invention comprises a plurality of rotating components, wherein the rotating components comprise rotating blades and driving members, wherein the driving members drive the rotating blades to rotate, and the rotating blades rotate to change the aperture of the reflow hole.

2. A self-priming pump reflux hole opening and closing device according to claim 1, characterized in that: It also includes a fixed ring and a power source. The driving member includes a transmission gear and a rotating shaft. The rotating blades and the transmission gear are both installed on the rotating shaft. The rotating shaft is connected to the fixed ring. The power source is used to drive the transmission gear to rotate.

3. A self-priming pump reflux hole opening and closing device according to claim 2, characterized in that: The power source includes a motor and an aperture gear. A matching gear is installed on the motor shaft of the motor. The matching gear is meshed with the aperture gear. The aperture gear is rotatably connected to the fixed ring. The aperture gear is meshed with the transmission gear.

4. A self-priming pump reflux hole opening and closing device according to claim 3, characterized in that: The rotating blades of the multiple rotating components are divided into two layers, an upper layer and an lower layer. When the rotating shaft rotates a certain angle, the multiple rotating blades completely cover the through hole of the fixed ring.

5. The self-priming pump reflux hole opening and closing device according to claim 4, characterized in that: The aperture gear is ring-shaped, the transmission gear is meshed with the inner teeth of the aperture gear, and the matching gear is meshed with the outer teeth of the aperture gear.

6. A self-priming pump reflux hole opening and closing device according to claim 3, characterized in that: The relationship between the transmission gear speed and the motor speed is: Among them, n3 is the speed of the transmission gear, unit: RPM, n is the speed of the mating gear, unit: RPM, z is the number of teeth of the mating gear, z1 is the number of teeth of the outer teeth of the aperture gear, z2 is the number of teeth of the inner teeth of the aperture gear, and z3 is the number of teeth of the transmission gear.

7. The self-priming pump reflux hole opening and closing device according to claim 3, characterized in that: The relationship between the transmission gear speed and the end linear velocity of the rotating blade is: Where n3 is the speed of the transmission gear, unit: RPM, v is the linear velocity of the end of the rotor blade, unit: m / s, R is the inner diameter of the tip trajectory of the rotor blade, unit: m, the transmission ratio of the transmission gear to the rotor blade i is 3→b .

8. The self-priming pump reflux hole opening and closing device according to claim 3, characterized in that: The relationship between the speed of the mating gear and the inner diameter of the rotor blade end is: v is the end linear velocity of the rotating blade, R is the inner diameter of the tip trajectory of the rotating blade, n is the rotation speed of the mating gear, unit: RPM, z is the number of teeth of the mating gear, z1 is the number of teeth of the outer teeth of the aperture gear, z2 is the number of teeth of the inner teeth of the aperture gear, and z3 is the number of teeth of the transmission gear.

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