阅读说明：本技术 一种应用于液压轴向柱塞泵的塑料密封螺堵 (Plastic sealing plug applied to hydraulic axial plunger pump ) 是由 王祥 龙本泽 吴学江 于 2021-03-05 设计创作，主要内容包括：本发明公开了一种应用于液压轴向柱塞泵的塑料密封螺堵,包括塑料螺堵本体(1),塑料螺堵本体(1)一端设有外螺纹结构(2),外螺纹结构(2)的内侧设有内锥面(T),内锥面(T)底部设有内锥面底圆(M)。本发明将塑料密封螺堵的密封平面改为内锥面,取消塑料密封螺堵上的沟槽,不用安装密封圈,塑料密封螺堵内锥面的底圆与油口密封平面线接触,利用塑料螺堵安装时其上内锥面的底圆面受到挤压产生塑性变形增加接触宽度以达到与油口密封平面完全贴合,从而实现密封,防止油口的油泄露。本发明具有加工难度低、安装方便以及密封成本较低的特点。(The invention discloses a plastic sealing plug applied to a hydraulic axial plunger pump, which comprises a plastic plug body (1), wherein an external thread structure (2) is arranged at one end of the plastic plug body (1), an internal conical surface (T) is arranged on the inner side of the external thread structure (2), and an internal conical surface bottom circle (M) is arranged at the bottom of the internal conical surface (T). The sealing plane of the plastic sealing plug is changed into the inner conical surface, a groove on the plastic sealing plug is omitted, a sealing ring is not required to be installed, the bottom circle of the inner conical surface of the plastic sealing plug is in line contact with the oil port sealing plane, and the plastic sealing plug is installed, so that the bottom circle of the upper inner conical surface of the plastic sealing plug is extruded to generate plastic deformation and increase the contact width, and the plastic sealing plug is completely attached to the oil port sealing plane, thereby realizing sealing and preventing oil leakage of the oil port. The invention has the characteristics of low processing difficulty, convenient installation and lower sealing cost.)

1. The utility model provides a be applied to plastic seal plug of hydraulic pressure axial plunger pump which characterized in that: the plastic plug comprises a plastic plug body (1), wherein an external thread structure (2) is arranged at one end of the plastic plug body (1), an inner conical surface (T) is arranged on the inner side of the external thread structure (2), and an inner conical surface bottom circle (M) is arranged at the bottom of the inner conical surface (T).

2. The plastic sealing plug applied to the hydraulic axial plunger pump according to claim 1, wherein: the cone angle of the inner conical surface (T) is alpha, and the value of alpha is 7-10 degrees.

3. The plastic sealing plug applied to the hydraulic axial plunger pump according to claim 1, wherein: the contact width of the bottom circle (M) of the inner conical surface is t, and the value of t is 0.05-0.2 mm.

4. The plastic sealing plug applied to the hydraulic axial plunger pump according to claim 1, wherein: the other end of the plastic plug body (1) is provided with an outer mounting hexagon(s) and a mounting cross groove (n).

5. The plastic sealing plug applied to the hydraulic axial plunger pump according to claim 1, wherein: the diameter of the external thread structure (2) is d.

Technical Field

The invention relates to a sealing plug, in particular to a plastic sealing plug applied to a hydraulic axial plunger pump.

Background

The external oil ports of the hydraulic axial plunger pump and the motor shell are sealed by plastic sealing plugs, and the sealing structure of the plastic sealing plugs is formed by installing sealing rings in grooves of the plastic plugs to play a sealing role. In such a way, the defect that the groove of the plastic plug is difficult to process exists, and the cost is increased by using the sealing ring; moreover, the plastic sealing plug requires a large moment when being installed, which causes inconvenience in installation. Therefore, the prior art has the problems of large processing difficulty, inconvenient installation and higher sealing cost.

Disclosure of Invention

The invention aims to provide a plastic sealing plug applied to a hydraulic axial plunger pump and a motor. The invention has the characteristics of low processing difficulty, convenient installation and lower sealing cost.

The technical scheme of the invention is as follows: the utility model provides a be applied to plastic seal plug of hydraulic pressure axial plunger pump and motor, includes the plastics plug body, plastics plug body one end is equipped with the external screw thread structure, and the inboard of external screw thread structure is equipped with interior conical surface, and interior conical surface bottom is equipped with interior conical surface base circle.

In the plastic sealing plug applied to the hydraulic axial plunger pump, the taper angle of the inner conical surface is alpha, and the value of alpha is 7-10 degrees.

In the plastic sealing plug applied to the hydraulic axial plunger pump, the contact width of the bottom circle of the inner conical surface is t, and the value of t is 0.05-0.2 mm.

In the plastic sealing plug applied to the hydraulic axial plunger pump, the other end of the plastic plug body is provided with the outer mounting hexagon and the mounting cross groove.

In the plastic sealing plug applied to the hydraulic axial plunger pump, the diameter of the external thread structure is d.

Compared with the prior art, the sealing plane of the plastic sealing plug is changed into the inner conical surface, the groove on the plastic sealing plug is omitted, the sealing ring is not required to be installed, the bottom circle of the inner conical surface of the plastic sealing plug is in line contact with the oil port sealing plane, and the plastic sealing plug is extruded to generate plastic deformation when being installed, so that the contact width is increased, the plastic sealing plug is completely attached to the oil port sealing plane, sealing is realized, and oil leakage of the oil port is prevented.

The groove is compared to the interior conical surface of the sealed plug of plastics and convenient to process, and need not install the sealing washer, has saved the cost, and sealed face is changed into line contact by the face contact, eliminates the influence of face unevenness to sealed, and the easy plastic deformation's that takes place characteristics of make full use of plastics increase the contact width simultaneously, makes the sealed plug of plastics laminate with the hydraulic fluid port plane completely, can reach sealed effect better. On the other hand, the plastic sealing plug with the sealing ring can ensure that the sealing plane of the plastic sealing plug is attached to the oil port surface only by applying larger torque during installation due to the retardation of the sealing ring, and once the plastic sealing plug and the oil port surface are not attached, dust or spray paint is easy to enter the sealing plane to cause pollution.

In conclusion, the invention has the characteristics of low processing difficulty, convenient installation and lower sealing cost.

Drawings

FIG. 1 is a view of the installation assembly of the present invention;

FIG. 2 is a schematic structural view of the plastic sealing plug of the present invention;

fig. 3 is a structural view of the other end of the plastic sealing plug.

The labels in the figures are: 1-plastic plug body, 2-external thread structure, 3-plastic sealing plug, 4-shell, T-inner conical surface, M-inner conical surface bottom circle, s-mounting outer hexagon and n-mounting cross groove.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. The utility model provides a be applied to plastic seal plug of hydraulic pressure axial plunger pump and motor, constitutes as shown in fig. 1 to 3, including plastic plug body 1, 1 one end of plastic plug body is equipped with external screw thread structure 2, and the inboard of external screw thread structure 2 is equipped with interior conical surface T, and interior conical surface T bottom is equipped with interior conical surface base circle M.

The cone angle of the inner conical surface T is alpha, and the value of alpha is 7-10 degrees.

The contact width of the bottom circle M of the inner conical surface is t, and the value of t is 0.05-0.2 mm.

The other end of the plastic plug body 1 is provided with an outer mounting hexagon s and a mounting cross groove n.

The diameter of the male thread formation 2 is d.

In fig. 2: d is the diameter of the external thread of the plastic plug body, d1 is the diameter of the large excircle of the plastic plug body, T is the inner conical surface of the plastic plug body, alpha is the taper angle of the inner conical surface T, M is the bottom circle of the inner conical surface T, the large excircle is intersected with the inner conical surface T, the intersection line is the bottom circle M of the inner conical surface T of the plastic plug body, the bottom circle M of the inner conical surface is a sealing strip, n is a mounting cross groove of the plastic plug body, and s is the mounting external hexagon of the plastic plug body.

As shown in fig. 1, the plastic sealing plug 3 is installed in place, that is, the external thread structure of the plastic sealing plug 3 is completely screwed into the oil port threaded hole (the diameter of the oil port threaded hole is D) of the housing 4, when the sealing surface T1 of the housing 4 is attached to the inner conical surface T of the plastic sealing plug 3, the bottom circle M of the inner conical surface T of the plastic sealing plug is in line contact with the sealing surface T1 of the housing 4, and the bottom circle M of the inner conical surface T is extruded to generate plastic deformation and increase the contact width T so as to completely attach to the sealing surface T1 of the housing 4, thereby achieving sealing and preventing oil leakage of the oil port of the housing 4.

The inner conical surface T is more convenient to process and manufacture compared with a rectangular sealing groove or a trapezoidal sealing groove of a traditional plastic sealing plug.

The traditional plastic sealing plug needs to be provided with a sealing ring to realize sealing; and the plastic sealing plug 3 of the application does not need to be provided with a sealing ring, so that the cost of the sealing ring is saved. The sealing surface T1 line contact of interior conical surface base circle M and casing 4 compares the plane of traditional plastic seal plug, can eliminate the influence of face unevenness to sealed, and the characteristics that the make full use of plastics receive the extrusion and easily take place plastic deformation simultaneously increase contact width T, make interior conical surface base circle M laminate completely with the hydraulic fluid port sealing surface T1 of casing, can reach sealed effect better.

The sealing ring on the traditional plastic sealing plug can cause resistance when the plastic sealing plug is installed and screwed, a larger moment is applied to ensure that the sealing plane of the traditional plastic plug is attached to the oil port sealing surface, once the sealing plane and the oil port sealing surface are not attached, dust or spray paint is easy to enter the sealing plane to cause pollution, and the plastic sealing plug can attach the bottom circle M of the inner conical surface to the oil port sealing surface T1 by applying a smaller moment to achieve a sealing effect.