A plunger pump housing and a plunger pump

Abstract

This utility model discloses a plunger pump housing and a plunger pump, relating to the field of plunger pump technology. The plunger pump housing has a limiting hole at its top for adapting to the plunger pump spindle. A countersunk structure is provided around the limiting hole, including a first positioning platform for mounting a shaft seal and a second positioning platform for adapting a bearing. The second positioning platform is located on the inner surface of the top of the plunger pump housing, and the first positioning platform is located on the inner surface of the top of the second positioning platform. The diameter of the first positioning platform is smaller than the diameter of the second positioning platform to accommodate the shaft seal. The plunger pump uses the plunger pump housing as its outer shell and includes a spindle, a shaft seal, and a bearing. The shaft seal is annularly fitted to the first positioning platform, and the bearing rests against the inner surface of the top of the second positioning platform. Through these features, this utility model simplifies the installation structure of the plunger pump, reduces production costs, and improves the reliability of the product's seal.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, specifically to a plunger pump housing and a plunger pump. Background Technology

[0002] Piston pumps are commonly used in construction machinery. The spindle, as the core component of the piston pump, has one part located inside the pump housing and the other extending outside for connection to other equipment. When the piston pump is operating, the housing cavity is filled with oil, and the spindle is rotating. Poor sealing of the spindle can cause oil leakage within the housing cavity, potentially leading to safety accidents. To prevent internal media leakage due to poor spindle sealing during operation, which could pose safety hazards to external operations, or to prevent air from being drawn into the housing cavity due to poor sealing, thus disrupting the piston pump's operation, special sealing of the spindle is required.

[0003] In existing sealing methods, the shaft seal is installed inside a shaft seal seat, which is then mounted on the housing and fixed to the housing. The shaft seal seat requires a cast blank; installing the shaft seal seat necessitates machining bolt holes in the housing or the shaft seal seat for bolt connection and fixation, resulting in a complex structure and a high risk of bolt loosening. During operation, the oil inside the cavity splashes and swirls with the rotating components, posing a significant risk of leakage and affecting the product's sealing reliability. The sealing reliability of a plunger pump has a crucial impact on product performance. Utility Model Content

[0004] The purpose of this utility model is to provide a plunger pump housing and a plunger pump, which, through a recessed platform structure, achieves the technical effect of simplifying the installation structure of the plunger pump and improving the overall sealing reliability.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0006] In the first aspect, this utility model provides a plunger pump housing, the top of which is provided with a limiting hole for adapting to the plunger pump spindle 4, and the periphery of the limiting hole is provided with a countersunk structure.

[0007] The sinking platform structure 1 includes a second positioning platform 13 located at the lower periphery of the limiting hole, and a first positioning platform 12 opened above the second positioning platform 13;

[0008] The central axes of the first positioning stage 12 and the second positioning stage 13 are collinear with the central axis of the limiting hole, so as to adapt to the shaft seal 2 and bearing 3 that are installed on the main shaft 4 in sequence;

[0009] The diameter of the limiting hole is smaller than the diameter of the first positioning platform 12;

[0010] The diameter of the first positioning stage is smaller than the diameter of the second positioning stage 13, and it is used to install the shaft seal 2.

[0011] Optionally, the sinking platform structure further includes a buffer platform disposed between the second positioning platform 13 and the first positioning platform 12; the diameter of the buffer platform is smaller than the diameter of the second positioning platform 13 and larger than the diameter of the first positioning platform 12.

[0012] By setting up a buffer platform, the bearing can be prevented from being unable to rest against the top end face of the second positioning platform due to the shaft seal height being higher than the height of the first positioning platform, thus improving the sealing performance of the housing.

[0013] Optionally, the sinking structure 1 further includes a receiving part 11, which is opened around the limiting hole at the top of the plunger pump housing. The central axis of the receiving part 11 and the limiting hole are collinear, and it is used to provide external equipment installation space at the top of the main shaft 4.

[0014] The collinearity of the accommodating part and the limiting hole ensures that the spindle protrusion is centered in the accommodating part, allows for the pre-reservation of casting holes, reduces the weight of the housing, and facilitates connection with the reducer and subsequent machining of the spindle.

[0015] Optionally, the side wall of the receiving part 11 is provided with an edge chamfer at the connection between it and the top end face of the plunger pump housing for accommodating external equipment.

[0016] The edge of the connection is designed with a chamfer to facilitate the connection of the extended shaft head to external equipment such as a speed reducer.

[0017] Secondly, this utility model provides a plunger pump, which uses the plunger pump housing described in the first aspect as the plunger pump outer shell.

[0018] Optionally, the plunger pump further includes a shaft seal 2 adapted to the first positioning platform, a bearing 3 adapted to the second positioning platform, and a main shaft 4. The shaft seal 2 is installed in the first positioning platform and sleeved on the main shaft near the shaft head. The bearing 3 is installed in the second positioning platform and sleeved on the periphery of the main shaft 4.

[0019] The above installation method can ensure normal spindle rotation and ensure the sealing of the housing cavity.

[0020] Optionally, the spindle 4 has a threaded end for mating with external equipment. This ensures a tight fit between the spindle and the external equipment, guaranteeing the stability of the equipment's operation.

[0021] Optionally, the shaft seal rests against the top upper surface and side wall of the first positioning platform 12, and the bearing rests against the top end face of the second positioning platform 13.

[0022] The shaft seal, being close to the upper surface of the positioning platform, improves the sealing performance of the housing and ensures the stability of the housing seal.

[0023] Optionally, the bearing is interference-fitted to the spindle.

[0024] The interference fit between the bearing and the spindle ensures that the bearing can work normally and avoids the shaft seal from spinning freely. At the same time, it reduces the possibility of bearing loosening and air gap, and prevents the leakage of medium in the housing cavity. The bearing ensures that the spindle can work normally without affecting the housing's sealing performance.

[0025] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0026] This invention provides a plunger pump housing and a plunger pump. A shaft seal is mounted on a corresponding positioning platform of the housing, forming a seal with the main shaft. A bearing rests against the upper surface of the corresponding recessed platform of the housing, eliminating the need for a shaft seal seat. This avoids the additional costs associated with casting a shaft seal seat blank and the structural complexity caused by multiple connection structures used when connecting the shaft seal seat to the housing. The structure of the first and second positioning platforms improves the stability of the housing seal and prevents leakage of the medium within the housing cavity. This invention simplifies the plunger pump installation structure, reduces production costs, and improves product sealing reliability. Attached Figure Description

[0027] Figure 1 The diagram shown is a schematic of the plunger pump housing platform structure.

[0028] Figure 2 The diagram shows a plunger pump structure with a recessed platform seal.

[0029] In the attached diagram: 1, plunger pump housing; 11, receiving part; 12, first positioning platform; 13, second positioning platform; 2, shaft seal; 3, bearing; 4, main shaft. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0031] In the description of this embodiment, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Example 1

[0034] This embodiment introduces a plunger pump housing. The plunger pump housing does not use a shaft seal seat. Instead, the shaft seal is directly installed on the corresponding positioning platform of the housing to form a seal with the main shaft. The top of the plunger pump housing is provided with a limiting hole for adapting to the plunger pump main shaft 4. The periphery of the limiting hole is provided with a countersunk structure.

[0035] The recessed platform structure 1 includes a second positioning platform 13 located at the lower periphery of the limiting hole and a first positioning platform 12 located above the second positioning platform 13. The first positioning platform 12 is used to mate with the shaft seal 2; the second positioning platform 13 is used to mate with the bearing. The first positioning platform 12 is located on the upper end face of the second positioning platform 13. The central axes of the first positioning platform 12 and the second positioning platform 13 are collinear with the central axis of the limiting hole. The plunger pump housing achieves housing sealing by mates with the main shaft, the shaft seal, and the bearing. The shaft seal 2 and the bearing are axially installed sequentially on the main shaft. The positioning holes of the main shaft, the first positioning platform for the shaft seal, and the second positioning platform for the bearing are collinear. To improve the sealing performance of the shaft seal 2 and the housing, the radial dimension of the limiting hole is smaller than the radial dimension of the first positioning platform. To facilitate the installation of the shaft seal on the plunger pump, the radial dimension of the first positioning platform is smaller than the radial dimension of the second positioning platform. The shaft seal is mounted against the first positioning platform, and the bearing rests against the upper end face of the second positioning platform. It can achieve sealing of the cavity inside the plunger pump housing without the need for a shaft seal seat, simplifying the installation structure, reducing costs, and improving the reliability of the housing seal.

[0036] Example 2

[0037] This embodiment describes a plunger pump, which uses a housing such as... Figure 1 As shown, the top of the plunger pump housing is provided with a limiting hole for adapting to the plunger pump spindle 4, and the periphery of the limiting hole is provided with a countersunk structure. The countersunk structure 1 is composed of a receiving part 11, a first positioning platform 12, a second positioning platform 13 and a buffer platform.

[0038] The main spindle has threads on its 4-axis head surface, which connect to the reducer to ensure the piston pump can work normally and ensure the stability of the equipment.

[0039] The limiting hole is used to fit the main shaft 4 and limit its position. The receiving part is used to reserve a casting hole to reduce the weight of the housing and facilitate connection with the reducer and subsequent machining of the main shaft. The first positioning table and the second positioning table are used to fit the shaft seal and bearing on the pump body main shaft.

[0040] like Figure 2 The plunger pump shown also includes a shaft seal 2 adapted to the first positioning platform, a bearing 3 adapted to the second positioning platform, and a main shaft 4. The shaft seal 2 is installed inside the first positioning platform and sleeved on the main shaft near the shaft head. The bearing 3 is installed inside the second positioning platform and sleeved on the periphery of the main shaft 4. This ensures a stable seal on the main shaft after it mates with the plunger pump housing, and the main shaft can rotate normally.

[0041] In this embodiment, to avoid the bearing being unable to abut against the upper surface of the second positioning platform due to the shaft seal height being higher than the first positioning platform height, such as... Figure 1 As shown, there is also a buffer platform between the first and second positioning stages, for reference. Figure 2The diagram shows the installation effect of the first positioning platform, the buffer platform, and the second positioning platform. The bearing is interference-fitted onto the spindle to ensure that the bearing does not spin freely, avoids air gap between the spindle 4 and the bearing, and prevents media leakage in the housing cavity. The shaft seal is abutted against the top upper surface and side wall of the first positioning platform 12, and the bearing is abutted against the top end face of the second positioning platform 13, which improves the housing sealing performance and ensures the stability of the housing seal.

[0042] The shaft seal, being close to the upper surface of the positioning platform, improves the sealing performance of the housing and ensures the stability of the housing seal.

[0043] The first positioning platform 12 can be adapted to the shaft seal. The shaft seal is mounted on the first positioning platform to seal the cavity of the housing. The bearing is mounted on the upper end face of the second positioning platform 13. In order to ensure smoother installation of the plunger pump, the radial dimension of the shaft seal 2 is smaller than the radial dimension of the bearing. Therefore, the radial dimension of the limiting hole is smaller than the radial dimension of the first positioning platform 12, which facilitates the installation of the main shaft in the limiting hole.

[0044] In this embodiment, the radial dimension of the first positioning platform 12 is smaller than that of the second positioning platform 13, which facilitates the fitting and installation of the shaft seal within the first positioning platform 12. The collinearity of the limiting hole, the first positioning platform 12, and the second positioning platform 13 facilitates the installation of the spindle 4, the shaft seal 2, and the bearing 3.

[0045] In this embodiment, the bearing 3 and the spindle 4 are connected by an interference fit to ensure that the bearing can work normally and avoid the shaft seal from spinning. At the same time, it reduces the possibility of the bearing loosening and air gap, and prevents the leakage of medium in the housing cavity. The bearing enables the spindle to work normally without affecting the housing sealing.

[0046] In this embodiment, the receiving part 11 is used to facilitate the connection of the main shaft to external equipment such as a speed reducer. The radial dimension of the receiving part 11 is larger than the radial dimension of the limiting hole, and the axes of the receiving part 11 and the limiting hole are collinear. To facilitate the connection of the main shaft 4 to external equipment, the connection between the side wall of the receiving part 11 and the top end face of the plunger pump housing is provided with an edge chamfer for accommodating external equipment, simplifying the subsequent installation difficulty.

[0047] The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A plunger pump housing, characterized in that, The top of the plunger pump housing is provided with a limiting hole for adapting to the plunger pump spindle (4), and the periphery of the limiting hole is provided with a countersunk structure. The sinking platform structure (1) includes a second positioning platform (13) located at the lower periphery of the limiting hole, and a first positioning platform (12) opened above the second positioning platform (13). The central axes of the first positioning stage (12) and the second positioning stage (13) are collinear with the central axis of the limiting hole, so as to adapt to the shaft seal (2) and bearing (3) installed on the main shaft (4) in sequence. The diameter of the limiting hole is smaller than the diameter of the first positioning platform (12); The diameter of the first positioning stage (12) is smaller than that of the second positioning stage (13), and it is used to install the shaft seal (2).

2. The plunger pump housing according to claim 1, characterized in that, The sinking platform structure also includes a buffer platform located between the second positioning platform (13) and the first positioning platform (12); the diameter of the buffer platform is smaller than the diameter of the second positioning platform (13) and larger than the diameter of the first positioning platform (12).

3. The plunger pump housing according to claim 1, characterized in that, The sinking platform structure also includes a receiving part (11), which is opened around the limiting hole at the top of the plunger pump housing. The central axis of the receiving part (11) and the limiting hole are collinear, and it is used to provide external equipment installation space at the top of the main shaft (4).

4. The plunger pump housing according to claim 3, characterized in that, The side wall of the accommodating part (11) is provided with an edge chamfer at the connection between the side wall and the top end face of the plunger pump housing for use with external equipment.

5. A plunger pump, characterized in that, The plunger pump housing as described in any one of claims 1 to 4 is used as the plunger pump outer shell.

6. The plunger pump according to claim 5, characterized in that, The plunger pump also includes a shaft seal (2) adapted to the first positioning platform, a bearing (3) adapted to the second positioning platform, and a main shaft (4). The shaft seal (2) is installed in the first positioning platform and sleeved on the main shaft near the shaft head. The bearing (3) is installed in the second positioning platform and sleeved on the periphery of the main shaft (4).

7. The plunger pump according to claim 6, characterized in that, The spindle (4) has a threaded end for connecting to external equipment.

8. The plunger pump according to claim 6, characterized in that, The shaft seal rests against the top upper surface and side wall of the first positioning platform (12), and the bearing rests against the top end surface of the second positioning platform (13).

9. The plunger pump according to claim 6, characterized in that, The bearing is interference-fitted and mounted on the spindle.

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