JPH0810357Y2 - Fluid filter - Google Patents

Description

Description: TECHNICAL FIELD The present application relates to a fluid filter used for filtering a fluid such as fuel and lubricating oil of an internal combustion engine.

[Prior Art] Conventionally, a fluid filter used for filtering fuel of an internal combustion engine is, as shown in FIG. 6, inside a housing 3 formed of a cup-shaped case 1 made of a thin plate and a disk-shaped cover 2. The filter element 4 is provided in the case 1, and the outer circumferences of the case 1 and the cover 2 are caulked and sealed, and the inflow / outflow pipes 5 and 6 are attached to the central portions of the case 1 and the cover 2, respectively. Become.

The fluid flows in through the inflow pipe 5 of the case 1, flows through the filter elements 4 and is filtered, and flows out through the outflow pipe 6.

[Problems to be Solved by the Invention] In the filter having the above structure, since the case 1 and the cover 2 are merely integrated by being swaged on the outer periphery, the case where the fluid pressure rises above a predetermined value The case 1 may be deformed outward, and the caulking seal portion may be damaged or the element 4 may be damaged.

[Means for Solving the Problems] A pleated filter paper body is arranged around a perforated inner cylinder and a filter element provided with an end plate is arranged in a housing formed by a thin cup-shaped case and a disk-shaped cover. A through hole is provided in the central portion of the case, cover and end plate, and a communication pipe having open ends at both ends and a closed portion between which a side hole is provided on both sides of the closed portion is inserted. The case and the cover are integrated.

[Operation] The pressure of the fluid flowing into the housing may rise above a predetermined value, but even in that case, the case and the cover are integrated by the communication pipe, and the cover swells outward. do not do.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which a fluid filter 10 has a structure in which a filter element 14 is disposed in a housing 13 formed by a thin cup-shaped case 11 and a disk-shaped cover 12. Have. The filter element 14 is one in which a pleated filter paper body 16 is arranged around a perforated inner cylinder 15 and an end plate 17 is provided at the lower end thereof with a seal adhesive layer interposed therebetween.
A through hole 18 is formed in the center of the end plate 17. The upper end of the pleated filter paper body 16 is fixed to the inner circumference of the cover 12 via a seal adhesive layer. The outer periphery of the open end of the case 11 and the outer periphery of the cover 12 are swaged and integrated with each other. A communicating pipe 21 is inserted into the through hole 19 provided in the bottom wall of the case 11, the through hole 20 provided in the cover 12, and the through hole 18. The communication pipe 21 has an inlet pipe portion 21a and an outlet pipe portion 21b as shown in FIG. 2 and FIG. A hole 22 is provided. The outlet pipe portion 21b has one end open and the other end closed, and has a side hole 23 in the side wall. A recess 24 provided with a thread groove is formed on one end surface of the inlet pipe portion 21a.
On the other hand, on the other end surface of the outlet pipe portion 21b, a threaded convex portion 25 is formed.

The inlet pipe portion 21a is inserted into the through hole 19 in the bottom wall of the case 11, and one end surface of the inlet pipe portion 21a abuts around the through hole 18 on one surface of the end plate 17 of the element. The outlet pipe portion 21b is inserted into the through hole 20 of the cover 12 and has the other end through the through hole 18 on the other surface of the end plate 17.
And the concave portion 24 of the inlet pipe portion 21a and the convex portion of the outlet pipe portion 21b are screwed together. As a result, the inlet / outlet pipe portions 21a and 21b are
It will be connected with the end plate 17 interposed therebetween. The contact surface between the through holes 19 and 20 and the communication pipe 21 is sealed with a seal material and a seal.

As a modified example of the communication pipe 21, as shown in FIG. 4, the communication pipe 21c is open at both ends and has blocking portions 26 between them, and side holes 27 and 28 are formed in side walls on both sides of the blocking portion. It is made by drilling.

FIG. 5 shows a fluid filter according to another embodiment, in which the structure of the filter element disposed in the housing 13 is different from that shown in FIG. That is, the filter element 14a has a well-known structure in which the pleated filter paper body 16a is arranged around the perforated inner cylinder 15a, and the end plates 17a and 17b are fixed to the upper and lower ends thereof with a seal adhesive layer. The through holes 18a and 18b are formed in the central portions of the end plates 17a and 17b.

The filter element 14a includes the through holes 18a of the end plates 17a and 17b,
The communication pipe 21c is inserted in the 18b, and the communication pipe 21c is further attached to the case 1
1 and through holes 19 and 20 of cover 12 to form a fluid filter. Between the end plate 17a of the filter element 14a and the cover 12, there is an annular packing 29, and between the end plate 17b and the case 1.
A spring 30 is attached between the bottom wall 1 and the bottom wall 1. In FIG. 5, the same structures as those in FIG. 1 have the same references.

In the fluid filter of FIG. 1, the inlet pipe portion of the communication pipe 21
A fluid such as fuel flowing from 21a enters the housing 13 through the side hole 22. From there the fluid is the filter element
It is circulated through 14 to be filtered, and flows out of the outlet pipe portion 21b through the side hole 23 of the outlet pipe portion 21b.

[Effect] As described above, the fluid filter of the present invention allows the fluid to flow in,
It has a structure in which the outflow pipes are integrally connected without being separated, and are inserted into the case and the through hole of the cover, so the structural strength can be increased with an extremely simple structure and the specified value Even if the above fluid pressure acts, the filter is prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluid filter of the present invention, FIGS. 2 and 3 are cross-sectional views of the communication pipe of FIG. 1, FIG. 4 is a cross-sectional view of a modification of the communication pipe, and FIG. FIG. 6 is a cross-sectional view showing another embodiment. FIG. 6 is a sectional view of a conventional fluid filter. 11 …… Cup-shaped case, 12 …… Disc-shaped cover 13 …… Housing 14 …… Filter element 17 …… End plate, 18, 19, 20 …… Through hole 21, 21c …… Communication pipe

Claims (1)

[Scope of utility model registration request] 1. A fluid filter in which a pleated filter paper body is disposed around a perforated inner cylinder and a filter element having an end plate is disposed in a housing formed by a thin plate cup-shaped case and a disk-shaped cover. In the above, the case, the cover and the end plate are provided with through holes at the central portions thereof, and communication pipes having both ends open and closed portions between them and side holes provided on both sides of the closed portions are inserted. A fluid filter having a structure in which a case and a cover are integrated.