Liquid inlet structure for a pump
By designing wheel housing structures and sealing rings with different radial shapes, the problems of insufficient pumped fluid and impact pressure were solved, achieving stability and safety of pumped fluid and extending the service life of the pump body.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENJIANG WANLIN PUMP CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-21
AI Technical Summary
The existing pump's inlet structure makes it difficult to pump liquid to the required height when the pumped liquid is insufficient. Furthermore, when the pumped liquid is sufficient, the impact pressure can affect the connection position between the inlet and outlet, reducing the pump's safety and stability and shortening its service life.
A pump inlet structure is designed, wherein the cross-section of the lower impeller housing is a radially outward-expanding arc shape, and the cross-section of the upper impeller housing is a radially inward-contracting arc shape. This increases the temporary storage space for the pumped liquid, reduces the impact pressure through the arc-shaped inner wall, and improves the sealing performance by using a sealing ring.
It enhances the stability and safety of the pumped liquid, extends the service life of the pump body, ensures that it can still effectively pump to the required height when the pumped liquid is insufficient, and reduces the impact on the connection between the inlet and outlet.
Smart Images
Figure CN224533072U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of pumps, specifically to a pump inlet structure. Background Technology
[0002] A pump is a mechanical device used to increase the pressure of a fluid and make it flow. It is often used to transport fluids to places with higher altitudes, higher pressures, or longer distances. Pumps are usually driven by an electric motor or other power source.
[0003] In the process of pumping liquid in through the inlet at the bottom of the pump body and then discharging it from one side of the top of the pump body, the pumped liquid enters the pump body as the shaft rotates. Existing inlet structures are often designed as cylindrical structures with a fixed radial dimension. This leads to:
[0004] When the pumping fluid is insufficient, it is difficult to pump the pumping fluid inside the pump body to the required height position because there is not enough pumping fluid stored at the bottom inlet position.
[0005] When the pumping fluid is sufficient, the pumping fluid pumped in from the bottom inlet will directly impact the bend connection between the inlet and outlet. After long-term use, the impact pressure of the pumping fluid will have an adverse effect on the bend connection between the inlet and outlet, reducing the safety and stability of the pumping process and affecting the service life of the pump body.
[0006] Therefore, there is an urgent need to provide a new solution to address the defects and shortcomings of the existing technologies. Utility Model Content
[0007] In order to overcome the defects and shortcomings of the existing technology, this utility model proposes a pump inlet structure.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A pump inlet structure includes an inlet seat.
[0010] A conical seat is fixed to the outer top of the liquid inlet seat, a lower pump housing is fixed to the top of the conical seat, and an upper pump housing is fixed to the top of the lower pump housing.
[0011] A lower wheel housing is fixed to the inner top of the liquid inlet seat, an upper wheel housing is fixed to the top of the lower wheel housing, and an outer expansion shell is fixed to the top of the upper wheel housing.
[0012] The top of the rotating shaft is fixedly connected to the motor output shaft, and the bottom of the rotating shaft is fixedly connected to the impeller. The rotating shaft and the impeller are located inside the lower wheel housing, the upper wheel housing, and the outer expansion housing, and the impeller is supported on the top of the liquid inlet seat.
[0013] Its features are:
[0014] The cross-section of the lower wheel housing is set as a radially outward-expanding arc shape, the cross-section of the upper wheel housing is set as a radially inward-retracting arc shape, and the cross-section of the outward-expanding shell is set as a radially inward-retracting straight line shape.
[0015] As a further preferred embodiment of the present invention, the impeller has an impeller inlet at its bottom and an impeller outlet communicating with the impeller inlet on its outer side. The impeller inlet is connected to the liquid inlet at the bottom of the liquid inlet seat, and the impeller outlet is connected to the interior of the lower wheel housing, the upper wheel housing, and the outer expansion housing.
[0016] As a further preferred embodiment of this utility model, an impeller bottom cover is fixed to the bottom of the impeller.
[0017] As a further preferred embodiment of the present invention, a rotating shaft tube is fixed inside the lower wheel housing, the upper wheel housing and the outer expansion housing. The bottom of the rotating shaft tube is fixedly connected to the guide vane cover. The bottom of the guide vane cover abuts against the top of the outer edge of the impeller. The rotating shaft passes through the interior of the rotating shaft tube and the guide vane cover.
[0018] As a further preferred embodiment of the present invention, a bushing is fixedly sleeved on the outer periphery of the rotating shaft, a bearing sleeve is fixedly sleeved on the inner wall of the guide vane cover, a bearing is provided between the bushing and the bearing sleeve, the outer ring of the bearing is fixedly connected to the bearing sleeve, and the inner ring of the bearing is fixedly connected to the bushing.
[0019] As a further preferred embodiment of the present invention, a first sealing ring is provided between the outer wall of the bottom of the impeller and the inner wall of the lower impeller housing.
[0020] As a further preferred embodiment of this utility model, a second sealing ring is provided between the outer wall of the top of the impeller and the inner wall of the guide vane cover.
[0021] As a further preferred embodiment of the present invention, the axial dimension of the lower wheel housing is smaller than the axial dimension of the upper wheel housing, and the axial dimension of the upper wheel housing is smaller than the axial dimension of the outer expansion shell.
[0022] As a further preferred embodiment of the present invention, the radial dimension of the lower wheel housing is greater than the radial dimension of the upper wheel housing, and the radial dimension of the upper wheel housing is greater than the radial dimension of the outer expansion shell.
[0023] As a further preferred embodiment of the present invention, the conical seat is fixed to the top of the liquid inlet seat by a concave-convex structure, and the bottom inner wall of the conical seat abuts against the inclined surface of the bottom outer wall of the lower wheel housing.
[0024] Compared with the prior art, the advantages and positive effects of this utility model include:
[0025] 1) This utility model provides a pump inlet structure. By setting the cross-section of the lower impeller housing to a radially outward arc shape and the cross-section of the upper impeller housing to a radially inward arc shape, the axial and radial spaces inside the lower and upper impeller housings are increased, thereby increasing the temporary storage space for pumped liquid. This allows the pumped liquid pumped in by the impeller to be stored in sufficient quantity at the inlet position. When the pumped liquid is insufficient, it can assist in pumping the pumped liquid inside the pump body to the outlet position at the required height.
[0026] 2) This utility model provides a pump sealing structure. By setting the cross-section of the lower wheel housing to a radially outward arc shape and the cross-section of the upper wheel housing to a radially inward arc shape, the inner wall of the wheel housing is replaced from a straight line to an arc shape. This can effectively reduce the impact pressure, thereby reducing the adverse effects of the impact pressure of the pumped liquid on the bending connection between the inlet and outlet, ensuring the safety and stability of the pumping process, and extending the service life of the pump body. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the internal structure of the present invention; Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] [First Embodiment]
[0032] like Figure 1 The diagram shows a pump inlet structure provided in the first embodiment of this utility model, including an inlet seat H1, a conical seat H2 fixed to the outer top of the inlet seat H1, a lower pump housing H3 fixed to the top of the conical seat H2, and an upper pump housing H4 fixed to the top of the lower pump housing H3; a lower wheel housing h1 fixed to the inner top of the inlet seat H1, an upper wheel housing h2 fixed to the top of the lower wheel housing h1, and an outer expansion housing h3 fixed to the top of the upper wheel housing h2; the wheel housing and pump housing protect the internal rotating shaft 1 and impeller 2; as a further preferred embodiment, the conical seat H2 is fixed to the top of the inlet seat H1 by a concave-convex structure, which ensures stable positioning and firm connection, while the bottom inner wall of the conical seat H2 abuts against the inclined surface of the bottom outer wall of the lower wheel housing h1, thereby simultaneously supporting and stabilizing the lower wheel housing h1 in both radial and axial directions through the conical seat H2.
[0033] The top of the rotating shaft 1 is fixedly connected to the motor output shaft, and the bottom of the rotating shaft 1 is fixedly connected to the impeller 2. The rotating shaft 1 and the impeller 2 are located inside the lower wheel housing h1, the upper wheel housing h2 and the outer expansion housing h3, and the impeller 2 is supported on the top of the liquid inlet seat H1. The motor outputs power through the motor output shaft to drive the rotating shaft 1, which is fixedly connected to it, to rotate synchronously, thereby driving the impeller 2, which is fixedly connected to the bottom of the rotating shaft 1, to rotate synchronously, so as to realize the pumping liquid is pumped in from the bottom liquid inlet IN and then discharged from the liquid outlet (not shown) at the top of the pump body.
[0034] The key contribution of this embodiment compared to the prior art is that: the cross-section of the lower impeller housing h1 is set as a radially outward-expanding arc shape, the cross-section of the upper impeller housing h2 is set as a radially inward-retracting arc shape, and the cross-section of the outward-expanding housing h3 is set as a radially inward-retracting straight line shape; by setting the cross-section of the lower impeller housing as a radially outward-expanding arc shape and the cross-section of the upper impeller housing as a radially inward-retracting arc shape, the axial and radial spaces inside the lower and upper impeller housings are increased, thereby increasing the temporary storage space for the pumped liquid, thus allowing the pumped liquid pumped in by the impeller to be sufficient. The liquid is stored at the inlet, and when the pumping liquid is insufficient, it helps to pump the internal pumping liquid to the outlet position at the required height. By setting the cross-section of the lower wheel housing to a radially outward arc shape and the cross-section of the upper wheel housing to a radially inward arc shape, the inner wall of the wheel housing is replaced from a straight shape to an arc shape, which can effectively reduce the impact pressure. This reduces the adverse effect of the impact pressure of the pumping liquid on the bending connection between the inlet and outlet, ensures the safety and stability of the pumping process, and extends the service life of the pump body.
[0035] As a further preferred embodiment, in this embodiment, the axial dimension of the lower wheel housing h1 is smaller than the axial dimension of the upper wheel housing h2, so that after the lower wheel housing h1 achieves the temporary storage effect of the pumped liquid, the upper wheel housing h2 with a longer axial dimension achieves the pressure reduction effect of the pumped liquid, thereby reducing the subsequent impact on the inner wall of the pump housing.
[0036] If the axial dimension of the upper wheel housing h2 is smaller than the axial dimension of the outer expansion housing h3, then the outer expansion housing h3 can provide a longer axial dimension to facilitate pumping the bottom pumping liquid into the high discharge port position.
[0037] The radial dimension of the lower impeller housing h1 is larger than that of the upper impeller housing h2, which increases the temporary storage space for the pumped liquid. This allows the pumped liquid pumped in by the impeller to be stored sufficiently at the inlet position. When the pumped liquid is insufficient, it helps to pump the pumped liquid inside the pump body to the outlet position at the required height. The radial dimension of the upper impeller housing h2 is larger than that of the outer expansion housing h3. The upper impeller housing h2 with a longer radial dimension achieves a pressure reduction effect on the pumped liquid, thereby reducing the impact on the inner wall of the pump casing.
[0038] like Figure 1 As shown, the impeller 2 has an impeller inlet 21 at its bottom and an impeller outlet 22 on its outer side that communicates with the impeller inlet 21. The impeller inlet 21 is connected to the liquid inlet IN at the bottom of the liquid inlet seat H1. The impeller outlet 22 is connected to the interior of the lower impeller housing h1, the upper impeller housing h2, and the outer expansion housing h3, so that the pumping liquid can enter through the liquid inlet IN, and after passing through the impeller inlet 21 and the impeller outlet 22, it enters the interior of the lower impeller housing h1, the upper impeller housing h2, and the outer expansion housing h3, and is finally discharged from the liquid outlet.
[0039] To achieve axial positioning of impeller 2, impeller bottom cover 3 is fixed to the bottom of impeller 2.
[0040] To achieve positioning and protection of the rotating shaft 1, a rotating shaft tube 4 is fixed inside the lower wheel housing h1, the upper wheel housing h2, and the outer expansion housing h3. The bottom of the rotating shaft tube 4 is fixedly connected to the guide vane cover 5, and the bottom of the guide vane cover 5 abuts against the top of the outer edge of the impeller 2. The rotating shaft 1 passes through the rotating shaft tube 4 and the guide vane cover 5. At the same time, to achieve stable rotation of the rotating shaft 1, a bushing 6 is fixedly sleeved on the outer circumference of the rotating shaft 1, and a bearing sleeve 8 is fixedly installed on the inner wall of the guide vane cover 5. A bearing 7 is installed between the bushing 6 and the bearing sleeve 8. The outer ring of the bearing 7 is fixedly connected to the bearing sleeve 8, and the inner ring of the bearing 7 is fixedly connected to the bushing 6. The bearing 7 provides stable support for the internal rotating shaft 1.
[0041] In addition, to further achieve a sealing effect, a first sealing ring S1 is provided between the bottom outer wall of the impeller 2 and the inner wall of the lower wheel housing h1; a second sealing ring S2 is provided between the top outer wall of the impeller 2 and the inner wall of the guide vane cover 5.
[0042] This embodiment provides a pump inlet structure. By setting the cross-section of the lower impeller housing to a radially outward-expanding arc shape and the cross-section of the upper impeller housing to a radially inward-retracting arc shape, the axial and radial spaces inside the lower and upper impeller housings are increased, thereby increasing the temporary storage space for the pumped liquid. This allows sufficient pumped liquid pumped in by the impeller to be stored at the inlet position. When the pumped liquid is insufficient, it helps to pump the pumped liquid inside the pump body to the outlet position at the required height. By setting the cross-section of the lower impeller housing to a radially outward-expanding arc shape and the cross-section of the upper impeller housing to a radially inward-retracting arc shape, the inner wall of the impeller housing is replaced from a straight shape to an arc shape, which can effectively reduce the impact pressure. This reduces the adverse effects of the impact pressure of the pumped liquid on the bending connection between the inlet and outlet, ensuring the safety and stability of the pumping process and extending the service life of the pump body.
[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.
Claims
1. A pump inlet structure, comprising an inlet seat (H1). A conical seat (H2) is fixed to the outer top of the liquid inlet seat (H1), a lower pump housing (H3) is fixed to the top of the conical seat (H2), and an upper pump housing (H4) is fixed to the top of the lower pump housing (H3). The lower wheel housing (h1) is fixed to the inner top of the liquid inlet seat (H1), the upper wheel housing (h2) is fixed to the top of the lower wheel housing (h1), and the outer expansion housing (h3) is fixed to the top of the upper wheel housing (h2). The top of the rotating shaft (1) is fixedly connected to the motor output shaft, and the bottom of the rotating shaft (1) is fixedly connected to the impeller (2). The rotating shaft (1) and the impeller (2) are located inside the lower wheel housing (h1), the upper wheel housing (h2) and the outer expansion housing (h3), and the impeller (2) is supported on the top of the liquid inlet seat (H1). Its features are: The cross-section of the lower wheel shell (h1) is set as a radially outward-expanding arc shape, the cross-section of the upper wheel shell (h2) is set as a radially inward-retracting arc shape, and the cross-section of the outward-expanding shell (h3) is set as a radially inward-retracting straight line shape.
2. The pump inlet structure according to claim 1, characterized in that: The impeller (2) has an impeller inlet (21) at its bottom and an impeller outlet (22) connected to the impeller inlet (21) on its outer side. The impeller inlet (21) is connected to the liquid inlet (IN) at the bottom of the liquid inlet seat (H1). The impeller outlet (22) is connected to the interior of the lower wheel housing (h1), the upper wheel housing (h2), and the outer expansion housing (h3).
3. The pump inlet structure according to claim 1, characterized in that: The bottom of the impeller (2) is fixed with an impeller bottom cover (3).
4. The pump inlet structure according to claim 1, characterized in that: The lower wheel housing (h1), upper wheel housing (h2) and outer expansion housing (h3) are fixed with a rotating shaft tube (4). The bottom of the rotating shaft tube (4) is fixedly connected to the guide vane cover (5). The bottom of the guide vane cover (5) abuts against the top of the outer edge of the impeller (2). The rotating shaft (1) passes through the interior of the rotating shaft tube (4) and the guide vane cover (5).
5. The pump inlet structure according to claim 4, characterized in that: The outer circumference of the rotating shaft (1) is fixedly fitted with a bushing (6), the inner wall of the guide vane cover (5) is fixed with a bearing sleeve (8), a bearing (7) is provided between the bushing (6) and the bearing sleeve (8), the outer ring of the bearing (7) is fixedly connected to the bearing sleeve (8), and the inner ring of the bearing (7) is fixedly connected to the bushing (6).
6. The pump inlet structure according to claim 1, characterized in that: A first sealing ring (S1) is provided between the bottom outer wall of the impeller (2) and the inner wall of the lower wheel housing (h1).
7. The pump inlet structure according to claim 4, characterized in that: A second sealing ring (S2) is provided between the top outer wall of the impeller (2) and the inner wall of the guide vane cover (5).
8. The pump inlet structure according to claim 1, characterized in that: The axial dimension of the lower wheel housing (h1) is smaller than that of the upper wheel housing (h2), and the axial dimension of the upper wheel housing (h2) is smaller than that of the outer expansion housing (h3).
9. The pump inlet structure according to claim 1, characterized in that: The radial dimension of the lower wheel housing (h1) is greater than that of the upper wheel housing (h2), and the radial dimension of the upper wheel housing (h2) is greater than that of the outer expansion housing (h3).
10. The pump inlet structure according to claim 1, characterized in that: The conical seat (H2) is fixed to the top of the liquid inlet seat (H1) by a concave-convex structure, and the bottom inner wall of the conical seat (H2) abuts against the bottom outer wall slope of the lower wheel housing (h1).