A water pump

Abstract

The present invention discloses a water pump, which includes a pump casing. An impeller installation pipe is rotatably arranged in the pump casing through a pump shaft. A first telescopic sleeve is coaxially arranged on the impeller installation pipe. The first telescopic sleeve is composed of a plurality of first sleeve units slidably sleeved in sequence. A set of blade assemblies is fixedly arranged or integrally arranged on the outer peripheral wall of each first sleeve unit. The pump shaft includes a connecting shaft and a connecting pipe coaxially and integrally arranged. The connecting shaft is connected to the motor shaft; the connecting pipe is coaxially and fixedly connected to the impeller installation pipe; a screw rod is rotatably arranged coaxially in the connecting pipe and the impeller installation pipe. When it is necessary to deploy the telescopic blades, the control device controls the screw rod to rotate forward to drive each first sleeve unit to axially extend. During the gradual extension of a plurality of first sleeve units and a plurality of second sleeve units, a plurality of sets of blade assemblies axially extend to deploy the telescopic blades, realizing the adjustment of the working height of the telescopic blades, facilitating the adjustment of the flow rate, and reducing the energy loss caused by controlling the flow rate of the water pump.

Description

Technical Field

[0001] The invention belongs to the technical field of pumps, and in particular relates to a water pump. Background Art

[0002] A water pump is generally composed of a pump casing, an impeller, a pump shaft and a bearing assembly. When the water pump is working, it is generally driven by an electric motor. The output shaft of the motor drives the pump shaft to rotate, and the pump shaft drives the impeller to rotate. The water entering the pump casing is pumped out through the outlet pipe under the centrifugal force of the impeller. Existing water pumps are generally used in urban water supply, sewage systems, civil construction systems, agricultural water conservancy systems, power station systems, chemical systems, petroleum industry systems, mining and metallurgy systems, light industry systems, ship systems and other fields.

[0003] In existing working conditions, it is generally required to control the displacement of the water pump. However, without changing the efficiency and head of the pump, the displacement can only be controlled by changing the motor speed through a frequency converter. This method is not only costly but also difficult to control. If the displacement of the pump is controlled by adding a throttle valve at the pump outlet, a large amount of energy consumption will be caused, which is inefficient. The present invention is designed to solve the above problems. Summary of the invention

[0004] In order to solve the technical problem of inappropriate water pump displacement control method existing in the above-mentioned prior art, the present invention proposes a water pump, which includes a pump casing, an impeller mounting tube is arranged in the pump casing through the rotation of the pump shaft, a first telescopic sleeve is coaxially arranged on the impeller mounting tube, the first telescopic sleeve is composed of a plurality of first sleeve units slidingly sleeved in sequence, a group of blade assemblies are fixedly arranged or integrally arranged on the outer peripheral wall of each first sleeve unit, and a plurality of groups of blade assemblies on a plurality of first sleeve units are overlapped and arranged to form telescopic blades that telescope along the axial direction of the pump shaft;

[0005] The pump shaft includes a connecting shaft and a connecting pipe which are coaxially integrated, the connecting shaft is connected to the motor shaft; the connecting pipe is coaxially fixedly connected to the impeller mounting tube; a screw is coaxially rotatably penetrated in the connecting tube and the impeller mounting tube, a second telescopic sleeve is coaxially sleeved on the screw, the second telescopic sleeve is composed of a plurality of second sleeve units which are slidably sleeved in sequence, an external thread is arranged on the outer peripheral wall of each second sleeve unit, a mounting disk which extends radially inward is fixedly arranged on each first sleeve unit, an axial through hole is arranged on the mounting disk, an internal thread is arranged on the inner peripheral wall of the mounting disk which surrounds the axial through hole, the mounting disks of the plurality of first sleeve units are threadedly sleeved on the screw and the plurality of second sleeve units from the inner layer to the outer layer in sequence from the outer layer to the inner layer; a control device for controlling the rotation of the screw is arranged on the connecting shaft.

[0006] Optionally, the control device includes a control rod, which is rotatable along its own axis and passes through the side wall of the connecting pipe to be transmission-connected to the screw rod through a bevel gear transmission assembly.

[0007] Optionally, a lock nut is threadedly connected to the outer side of the control rod. When the lock nut is screwed until it abuts against the outer wall of the connecting pipe, the control rod is locked.

[0008] Optionally, the screw rod and the adjacent second sleeve assembly are coaxially slidably connected by a key connection, and the two adjacent second sleeve units in a nested manner are coaxially slidably connected by a key connection.

[0009] Optionally, at one end of each second sleeve unit that abuts against the mounting disc on the adjacent first sleeve unit, a radially outward extending abutting disc is fixedly provided or integrally provided.

[0010] Optionally, a disc body is coaxially fixedly provided or coaxially integrally provided on the outer peripheral wall of the impeller mounting pipe. An embedding slot is opened on the end face of the disc body. After the telescopic blades are contracted, several groups of blade assemblies are overlapped and embedded into the embedding slot.

[0011] Optionally, a relief groove for the blade assembly on the inner layer first sleeve unit to be embedded is opened on the outer layer first sleeve unit of two adjacent first sleeve units.

[0012] Optionally, the outer port of the inner layer second sleeve unit of the second telescopic sleeve is closed.

[0013] The water pump of the present invention has the following beneficial technical effects:

[0014] 1. By arranging multiple layers of overlapping blade assemblies and controlling the relative movement and staggering of the multiple layers of blade assemblies, the overall height can be changed, thereby changing the working height of the telescopic blades, and further changing the displacement of the water pump. The flow control is convenient, and the energy loss caused by controlling the water pump flow is reduced.

[0015] 2. By using the first telescopic sleeve and arranging blade assemblies on each first sleeve unit, the relative sliding of several first sleeve units can be used to control the sliding of the blade assemblies, thereby controlling the total working height of the telescopic blades. The structure is simple, the operation is convenient, and the flow adjustment efficiency is high.

[0016] 3. By using the screw rod and the second telescopic sleeve, the screw rod and the second telescopic sleeve are respectively matched with the first telescopic sleeve, and the screw rod and the second telescopic sleeve are matched by a flat key. Rotating the screw rod can drive the relative movement of the first telescopic sleeve through thread cooperation, and further drive the relative sliding of the blade assemblies, thereby controlling the total working height of the telescopic blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Figure 1 is the external view of the present invention;

[0018] Figure 2 is the internal structure diagram of the present invention at zero displacement;

[0019] Figure 3 This is the internal structure diagram when the telescopic blade of the present invention changes the total height;

[0020] Figure 4 This is the three-dimensional diagram of the internal mechanism of the present invention;

[0021] Figure 5 This is the external shape diagram of the disk body of the present invention;

[0022] Figure 6 This is the external shape diagram of the impeller installation pipe and the disk body of the present invention;

[0023] Figure 7 This is the external shape diagram of the first sleeve unit of the inner layer of the present invention;

[0024] Figure 8 This is the external shape diagram of the first sleeve unit of the middle layer of the present invention;

[0025] Figure 9 This is the external shape diagram of the first sleeve unit of the outer layer of the present invention;

[0026] Figure 10 For the present invention Figure 4 The enlarged view at I in.

[0027] Reference numerals: 1, pump casing; 11, water inlet; 12, water outlet; 2, impeller installation pipe; 21, disk body; 211, embedded card slot; 3, first telescopic sleeve; 31, first sleeve unit; 311, installation disk; 312, relief groove; 4, second telescopic sleeve; 41, second sleeve unit; 411, abutting disk; 5, telescopic blade; 51, blade assembly; 6, pump shaft; 61, connecting shaft; 62, connecting pipe; 7, screw; 71, first bevel gear; 8, control rod; 81, second bevel gear; 82, locking nut. Detailed implementation manners

[0028] The technical solutions of the present invention will be further introduced in detail below with reference to the drawings and embodiments.

[0029] Embodiment

[0030] Combined with Figures 1-10As shown, this embodiment provides a water pump, which includes a pump casing 1, an impeller mounting tube 2 is rotatably arranged in the pump casing 1 through a pump shaft 6, a first telescopic sleeve 3 is coaxially slidably arranged on the impeller mounting tube 2, the first telescopic sleeve 3 is composed of a plurality of first sleeve units 31 that are slidably sleeved in sequence, a group of blade assemblies 51 are fixedly arranged or integrally arranged on the outer peripheral wall of each first sleeve unit 31, and a plurality of groups of blade assemblies 51 on a plurality of first sleeve units 31 are overlapped and arranged to form telescopic blades 5 that are telescopic and retractable along the axial direction of the pump shaft 6. The pump shaft 6 includes a connecting shaft 61 and a connecting pipe 62 which are coaxially integrated, the connecting shaft 61 is connected to the motor shaft; the connecting pipe 62 is coaxially fixedly connected to the impeller mounting tube 2; a screw 7 is coaxially rotatably penetrated in the connecting pipe 62 and the impeller mounting tube 2, a second telescopic sleeve 4 is coaxially sleeved on the screw 7, the second telescopic sleeve 4 is composed of a plurality of second sleeve units 41 which are slidably sleeved in sequence, an external thread is arranged on the outer peripheral wall of each second sleeve unit 41, a mounting disk 311 which extends radially inward is fixedly arranged on each first sleeve unit 31, an axial through hole is arranged on the mounting disk 311, an internal thread is arranged on the inner peripheral wall of the mounting disk 311 which is surrounded by the axial through hole, the mounting disks 311 of the plurality of first sleeve units 31 are threadedly sleeved on the screw 7 and the plurality of second sleeve units 41 from the inner layer to the outer layer in sequence from the outer layer to the inner layer; a control device for controlling the rotation of the screw 7 is arranged on the connecting shaft 61.

[0031] Through the above arrangement, when the telescopic blades 5 need to be unfolded, the control device controls the screw 7 to rotate forward to drive each first sleeve unit 31 to extend axially, and at the same time, each first sleeve unit 31 pushes the adjacent second sleeve unit 41 to extend axially. In the process of gradually extending a plurality of first sleeve units 31 and a plurality of second sleeve units 41, a plurality of groups of blade assemblies 51 extend axially to unfold the telescopic blades 5. Similarly, when the telescopic blades 5 need to be retracted, the control device controls the screw 7 to rotate in the reverse direction to drive the telescopic blades 5 to retract.

[0032] In the water pump of this embodiment, the control device includes a control rod 8, which is rotatable along its own axis and passes through the side wall of the connecting pipe 62 and is transmission-connected to the screw rod 7 through a bevel gear transmission assembly.

[0033] Through the above arrangement, the bevel gear transmission assembly is used to realize the transmission connection between the control rod 8 and the vertical screw rod 7, which has a simple structure, low cost and convenient operation. Specifically, a first bevel gear 71 is coaxially fixedly arranged at one end of the screw rod 7, and a second bevel gear 81 is arranged in the connecting tube 62 through a rotating shaft. The first bevel gear 71 is meshed and connected with the second bevel gear 81, and the screw rod 7 is driven to rotate by rotating the rotating shaft.

[0034] In the water pump of this embodiment, a lock nut 82 is threadedly connected to the outer side of the control rod 8. When the lock nut 82 is screwed until it abuts against the outer wall of the connecting pipe 62, the control rod 8 is locked. Through the above arrangement, when it is necessary to control the rotation of the screw rod 7, loosen the lock nut 82 until the lock nut 82 is separated from the outer peripheral wall of the connecting pipe 62, so that the control rod 8 can be rotated to drive the screw rod 7 to rotate. When it is necessary to lock the screw rod 7 so that it does not rotate, by tightening the lock nut 82 until the lock nut 82 abuts against the outer peripheral wall of the connecting pipe 62, the control rod 8 is locked. Under the meshing action of the bevel gear transmission assembly, the screw rod 7 is locked and does not rotate, so that the extended length of the telescopic blade 5 is fixed.

[0035] Specifically, one end of the control rod 8 passes through the side wall of the connecting pipe 62, and the lock nut 82 is threadedly connected to the control rod 8 located outside the connecting pipe 62, which is convenient for the staff to rotate the control rod 8 from the outside.

[0036] In the water pump of this embodiment, the screw rod 7 and the adjacent second sleeve unit 41 are coaxially slidably connected by a key connection method, and the two adjacent second sleeve units 41 sleeved on each other are coaxially slidably connected by a key connection method.

[0037] In the water pump of this embodiment, at one end of each second sleeve unit 41 that abuts against the mounting plate 311 on the adjacent first sleeve unit 31, a contact plate 411 that extends radially outward is fixedly provided or integrally provided.

[0038] Through the above arrangement, the contact plate 411 contacts the mounting plate 311, increasing the contact area, resulting in a better pushing effect and more stable movement.

[0039] In the water pump of this embodiment, a disk body 21 is coaxially fixedly provided or coaxially integrally provided on the outer peripheral wall of the impeller mounting pipe 2. An embedding slot 211 is opened on the end face of the disk body 21. After the telescopic blade 5 contracts, several groups of blade assemblies 51 are overlapped and embedded into the embedding slot 211.

[0040] Through the above arrangement, since several groups of blade assemblies 51 are overlapped and arranged and embedded in the embedding slot 211, it plays a role in limiting. The rotation directions of several second sleeve units 41 are the same as that of the screw rod 7, so that several first sleeve units 31 do not rotate while moving axially, ensuring the normal telescoping of the telescopic blade 5.

[0041] In the water pump of this embodiment, a relief groove 312 for the blade assembly 51 on the inner layer first sleeve unit 31 to be embedded is opened on the outer layer first sleeve unit 31 among two adjacent first sleeve units 31.

[0042] Through the above-mentioned arrangement, the setting of the giving way slot 312 improves the overlapping degree of several blade assemblies 51, and the range of flow control is wider. Several groups of blades completely overlap so that the telescopic blades 5 are completely embedded in the embedding slot 211, so that the water pump is in a zero displacement state.

[0043] In the water pump of this embodiment, the outer port of the inner second sleeve unit 41 of the second telescopic sleeve 4 is closed. Through the above arrangement, the outer port is closed to prevent water in the water pump from entering between the first telescopic sleeve 3 and the second telescopic sleeve and affecting the normal operation of the mechanical structure.

[0044] In the water pump of this embodiment, the first telescopic sleeve 3 is composed of three first sleeve units 31 , and the second telescopic sleeve 4 is composed of two second sleeve units 41 .

[0045] The working principle of the water pump is as follows:

[0046] Figure 1 This is the appearance of the water pump of this embodiment. When the water pump of this embodiment needs to be used, the water inlet 11 of the water pump is connected to the water source, the water outlet 12 of the water pump is connected to the delivery pipeline, and the motor is started to drive the pump shaft 6 to rotate. Since the pump shaft 6 is fixedly matched with the impeller mounting tube 2, the impeller mounting tube 2 follows the rotation, and the blade assembly 51 is overlapped and embedded in the embedding slot 211, so that the first telescopic sleeve 3 follows the impeller mounting tube 2 to rotate.

[0047] like Figure 2 As shown, at this time, the blades are all retracted into the embedded slots 211 on the disc body 21. At this time, the working height of the telescopic blades 5 is zero, and the water pump is in a zero displacement state.

[0048] When the flow rate of the water pump needs to be adjusted, first loosen the locking nut 82 so that the control rod 8 can rotate. The rotating control rod 8 drives the screw rod 7 to rotate through the action of the bevel gear transmission assembly. Since the second telescopic sleeve 4 is sleeved outside the screw rod 7, the two adjacent second sleeve units 41 are connected by a flat key, so that the rotation of the screw rod 7 drives the second telescopic sleeve 4 to rotate together.

[0049] Since the screw 7 is threadedly connected to the outer first sleeve unit 31, the inner second sleeve unit 41 is threadedly connected to the middle first sleeve unit 31, the outer second sleeve unit 41 is threadedly connected to the inner first sleeve unit 31, the outer first sleeve unit 31 is rotatably connected to the inner second sleeve unit 41, and the middle first sleeve unit 31 is rotatably connected to the outer second sleeve unit 41, when the screw 7 rotates forward, the screw 7 drives the outer first sleeve unit 31 to move a certain distance to the left. The first sleeve unit 31 simultaneously pushes the inner second sleeve unit 41 to move a certain distance to the left. While the inner second sleeve unit 41 follows the rotation of the screw 7, it drives the middle first sleeve unit 31 and the outer second sleeve unit 41 to move a certain distance to the left. While the outer second sleeve unit 41 follows the rotation of the screw 7, it drives the inner first sleeve unit 31 to move a certain distance to the left. As a result, the blade assembly 51 moves to the left, causing the working height of the telescopic blade 5 to increase.

[0050] Specifically, the screw 7 drives the outer first sleeve unit 31 to move a certain distance to the left relative to the impeller mounting pipe 2. The inner second sleeve unit 41 drives the middle first sleeve unit 31 to move the same distance to the left relative to the outer first sleeve unit 31. The outer second sleeve unit 31 drives the inner first sleeve unit 31 to move the same distance to the left relative to the middle first sleeve unit 31, thereby driving the blade assembly 51 to extend simultaneously and stagger from each other. As shown in Figure 3 the figure, the total working height of the telescopic blade 5 is increased, thereby increasing the water pump flow rate. Similarly, when the screw 7 rotates in reverse, it drives the telescopic blade 5 to contract simultaneously, reducing the total working height of the blade, and thus reducing the water pump flow rate.

Claims

1. A water pump, characterized in that, The invention comprises a pump casing (1), wherein an impeller mounting tube (2) is rotatably arranged in the pump casing (1) via a pump shaft (6), a first telescopic sleeve (3) is coaxially arranged on the impeller mounting tube (2), the first telescopic sleeve (3) is composed of a plurality of first sleeve units (31) which are slidably sleeved in sequence, a group of blade assemblies (51) is fixedly arranged or integrally arranged on the outer peripheral wall of each first sleeve unit (31), and a plurality of groups of blade assemblies (51) on a plurality of first sleeve units (31) are overlapped and arranged to form telescopic blades (5) that telescope along the axial direction of the pump shaft (6); The pump shaft (6) comprises a connecting shaft (61) and a connecting pipe (62) which are coaxially integrated, the connecting shaft (61) being connected to the motor shaft; the connecting pipe (62) being coaxially fixedly connected to the impeller mounting pipe (2); a screw (7) being coaxially rotatably inserted into the connecting pipe (62) and the impeller mounting pipe (2); a second telescopic sleeve (4) being coaxially sleeved on the screw (7); the second telescopic sleeve (4) being composed of a plurality of second sleeve units (41) being slidably sleeved in sequence, and an external thread is provided on the outer peripheral wall of each second sleeve unit (41). A mounting plate (311) extending radially inward is fixedly arranged on each first sleeve unit (31), an axial through hole is provided on the mounting plate (311), an inner circumferential wall of the mounting plate (311) surrounding the axial through hole is provided with an internal thread, and the mounting plates (311) of a plurality of first sleeve units (31) are threadedly sleeved on the screw rod (7) and a plurality of second sleeve units (41) from the inner layer to the outer layer in sequence from the outer layer to the inner layer in a one-to-one correspondence; a control device for controlling the rotation of the screw rod (7) is provided on the connecting shaft (61).

2. The water pump according to claim 1, wherein The control device comprises a control rod (8), which is rotatable along its own axis and passes through the side wall of the connecting pipe (62) and is transmission-connected with the screw rod (7) through a bevel gear transmission assembly.

3. The water pump according to claim 2, characterized in that, The outer side of the control rod (8) is threadedly connected to a locking nut (82). When the locking nut (82) is screwed to abut against the outer wall of the connecting pipe (62), the control rod (8) is locked.

4. The water pump according to claim 1, wherein, The screw rod (7) is coaxially slidably connected to the adjacent second sleeve assembly by means of a key connection, and the two adjacent sleeved second sleeve units (41) are coaxially slidably connected by means of a key connection.

5. The water pump according to claim 1, characterized in that, An abutment disk (411) extending radially outward is fixedly arranged or integrally arranged on one end of each second sleeve unit (41) that abuts against the mounting disk (311) on the adjacent first sleeve unit (31).

6. The water pump according to claim 1, wherein, The outer peripheral wall of the impeller mounting tube (2) is coaxially fixedly arranged or coaxially integrally arranged with a disc body (21), and an embedding slot (211) is provided on the end surface of the disc body (21). When the telescopic blades (5) are retracted, a plurality of groups of blade assemblies (51) overlap and embed into the embedding slot (211).

7. The water pump according to claim 1, wherein An outer first sleeve unit (31) of two adjacent first sleeve units (31) is provided with a clearance groove (312) for the blade assembly (51) on the inner first sleeve unit (31) to be embedded.

8. The water pump according to claim 1, characterized in that, The outer end of the inner second sleeve unit (41) of the second telescopic sleeve (4) is closed.

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