JPH0580511U - Relief valve such as filter - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the structure of the relief valve of the filter or cooler. A conduit in the filter 14 or the like is provided with an inlet 22 for a fluid filtered or cooled by the filter element 15 or the like and an inlet 23 for an unfiltered or uncooled fluid flowing around the filter element. A valve body 24 of a relief valve is provided between the inlet for the filtered or cooled fluid and the inlet for the unfiltered or uncooled fluid in the conduit. The valve element is composed of a leaf spring piece and is fixed inside the conduit to block the inlet of the filtered or uncooled fluid. The fluid flows into the conduit while pushing the leaf spring pieces away.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter for filtering fluid such as oil and air or a relief valve in a cooler for cooling fluid.

[0002]

[Prior Art]

 As shown in FIGS. 5 and 6, a conventional filter 1 for filtering oil or the like is composed of a filter element 2, a case 3 for accommodating the filter element 2, and a case 3 fixed to a filter mounting portion 4. And a hollow bolt 5 for

The hollow bolt 5 also serves as a fluid conduit, and an inlet port 6 for the already-filtered fluid is bored at a location facing the clean side of the filter element 2 and a location not facing the filter element 2. Is provided with an inlet 7 for an unfiltered fluid that bypasses the filter element 2.

In addition, a relief valve is provided in the hollow bolt 5 to allow the flow of the unfiltered fluid from the inlet 7 side to the already filtered fluid to the inlet 6 side and prevent the flow in the opposite direction. Has been. That is, in FIGS. 5 and 6, reference numeral 8 indicates a valve body of a relief valve provided between the inlet 6 for the filtered fluid and the inlet 7 for the unfiltered fluid in the conduit. The valve body 8 is a disc type, and the step formed in the conduit serves as a valve seat 9. The valve body 8 is pressed against the valve seat 9 by the compression coil spring 11 which is interposed between the valve body 8 and the pin 10 fixed to the conduit, so that the fluid flowing from the unfiltered fluid inlet 7 into the conduit is prevented. Only when the pressure overcomes the compression coil spring 11, the pressure spring is separated from the valve seat 9.

Thus, as shown in FIG. 5, fluid such as oil flows into the filter 1 from the passage 12 of the filter attachment point 4, is filtered while passing through the filter element 2, and is filtered. It enters into the hollow bolt 5 through the inlet 6 and flows into the passage 13 of the filter mounting portion 4, and is circulated to the engine or the like. However, when the fluid is difficult to pass through the filter element due to its high viscosity such as oil when starting the engine, the fluid pressure overcomes the compression coil spring 11 and, as shown in FIG. The unfiltered fluid flows from the inlet 7 into the hollow bolt 5, pushes down the valve body 8 and flows toward the filter mounting point 4. This makes it possible to compensate for the lack of oil in the engine and the like.

A similar relief valve is also provided in a cooler for oil or the like, and operates in a case where the viscosity of oil is high and it is difficult to flow, such as in cold weather, so as to ensure a constant flow rate.

That is, as shown in FIG. 8, the cooler 28 includes cooling cores 29 stacked in multiple stages, a case 30 for housing the cooling cores 29, and the case 30 fixed to a cooler attachment point 31. And a hollow bolt 32.

The hollow bolt 32 also serves as a conduit for a fluid such as oil, and an inlet 33 for the already-cooled fluid is bored at a location facing the inner peripheral side of the cooling core 29 to face the cooling core 29. An inlet 34 for an uncooled fluid that flows through the cooling core 29 is bored at a portion that does not flow.

In the hollow bolt 32, a relief valve is provided which allows the flow of the uncooled fluid from the inlet 34 side to the cooled fluid of the inlet 33 side and blocks the flow in the opposite direction. ing. The valve body 35 of the relief valve is provided in the conduit between the inlet 33 for the cooled fluid and the inlet 34 for the uncooled fluid. The valve body 35 is a disc type, and a step formed in the conduit serves as a valve seat 36. The valve body 35 is pressed against the valve seat 36 by a compression coil spring 38 interposed between the valve body 35 and a pin 37 fixed to the conduit, and flows into the conduit from the uncooled fluid inlet 34. Only when the pressure of the fluid overcomes the compression coil spring 38, is it separated from the valve seat 36.

Therefore, a fluid such as oil flows into the cooling core 29 from the passage 39 of the cooler mounting portion 31, is cooled while passing through the cooling core 29, and is introduced from the inlet 33 of the already-cooled fluid into the hollow bolt 32. After entering, it flows into the passage 40 of the cooler attachment point 31 and circulates to the engine or the like. However, when it is difficult for the fluid to pass through the cooling core 29 due to its high viscosity such as oil in cold weather, the fluid pressure overcomes the compression coil spring 38, and the fluid flows from the uncooled fluid inlet 34 to the hollow bolt. It flows into 32, pushes down the valve element 35, and flows toward the cooler attachment point 31. This makes it possible to compensate for the lack of oil in the engine and the like.

[0011]

[Problems to be solved by the device]

 However, the relief valve in the conventional filter 1 or the cooler 28 includes the valve elements 8 and 35, the compression coil springs 11 and 38 that press the valve elements 8 and 35 against the valve seats 9 and 36, and the compression coil springs 11 and 38. It has pins 10 and 37 for supporting and steps to be valve seats 9 and 36. Therefore, the number of parts is large, and the processing man-hours and assembly man-hours are also large.

Further, since the compression coil springs 11, 38, the pins 10, 37, etc. must be inserted, there is also a problem that the hollow bolts 5, 32 must be formed in a long length.

Further, since the compression coil springs 11, 38 and the like are interposed in the fluid flow path, the smoothness of the flow of the already filtered fluid or the already cooled fluid is impaired. The present invention aims to solve the above problems.

[0014]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the first invention, an inlet for the filtered fluid filtered by the filter element and an inlet for the unfiltered fluid flowing around the filter element are provided in a conduit in the filter. In a relief valve of a filter in which a valve body of a relief valve is provided between an inlet of the already filtered fluid and an inlet of the unfiltered fluid in the conduit, the valve body is fixed in the conduit. A second aspect of the present invention is a leaf spring piece, in which the leaf baffle piece shields the inlet of the unfiltered fluid and the inlet of the already cooled fluid cooled by a cooling core and the cooling core. An inlet for the uncooled fluid that flows through is provided in the conduit in the cooler, and a valve element for the relief valve is provided in the conduit between the inlet for the cooled fluid and the inlet for the uncooled fluid. Cooler relief bal In the valve body is a plate spring piece which is fastened in the conduit employs a configuration in which the plate spring piece shielded from inlet of said uncooled fluid.

[0015]

[Action]

 In the first aspect of the present invention, the fluid is purified while passing through the filter element from the dust side to the clean side, and then flows into the conduit from the inlet of the already filtered fluid. Then, it flows toward the filter mounting location.

When the pressure loss of the fluid in the filter increases, the fluid bypasses the filter element and flows toward the inlet of the unfiltered fluid. Then, it overcomes the leaf spring piece, flows into the conduit through the inlet, and flows toward the filter attachment point.

In the second aspect of the invention, the fluid is cooled while flowing in the cooling core and flows into the conduit from the inlet of the already cooled fluid. Then, it flows toward the cooler attachment point. When the pressure loss of the fluid in the cooler becomes large, the fluid flows through the cooling core and goes to the inlet of the uncooled fluid. Then, it overcomes the leaf spring piece, flows into the guide tube from the introduction port, and flows toward the cooler attachment point.

The relief valve in the first and second inventions has a simple structure because the leaf spring piece also serves as the conventional valve body, compression coil spring and the like. Assembly is also easy.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 As shown in FIGS. 1 to 4, a filter 14 includes a filter element 15, a case 16 for housing the filter element 15, and a hollow bolt 18 for fixing the case 16 to a filter mounting portion 17. I have it.

The filter element 15 has a tubular shape, and is pressed against the filter mounting portion 17 by a compression coil spring 19 provided on the ceiling side of the case 16. Further, sealing members 20 and 21 which are in close contact with the wall surface of the hollow bolt 18 penetrating the center hole of the filter element 15 are attached to the upper and lower ends of the filter element 15, and the sealing member 20 and 21 seal the filter element 15 to dust. It is divided into a side and a clean side.

The hollow bolt 18 penetrates the center of the case 16 in the vertical direction, and the tip end of the hollow bolt 18 is screwed into the filter mounting portion 17, thereby fixing the case 16 to the filter mounting portion 17.

The hollow bolt 18 also serves as a fluid conduit, and an inlet 22 for the already-filtered fluid is bored at a location facing the clean side of the filter element 15. An unfiltered fluid inlet 23 that bypasses the filter element 15 is formed at a location between the ceiling of the case 16 and the upper surface of the filter element 15, which is a location not facing the filter element 15.

Inside the hollow bolt 18, there is provided a relief valve that allows the flow of the unfiltered fluid from the inlet 23 side to the flow of the filtered fluid to the inlet 22 side and blocks the flow in the opposite direction. ing. That is, reference numeral 24 indicates a valve element of a relief valve provided in the conduit between the inlet 22 for the already filtered fluid and the inlet 23 for the unfiltered fluid. The valve body is a leaf spring piece, which is curved in a ring shape and is fixed to the hollow bolt 18 with a rivet 25 at the center thereof. Both blades of the leaf spring piece block the inlet 23 for the unfiltered fluid. The leaf spring piece is formed to have a diameter slightly larger than the inner diameter of the hollow bolt 18, so that the inner wall surface of the conduit is in close contact with the inner wall surface as a valve seat. The leaf spring piece is separated from the valve seat only when the pressure of the fluid flowing into the conduit from the unfiltered fluid inlet 23 overcomes the pressing force of the leaf spring piece.

Thus, as shown in FIG. 1, the fluid such as oil flows into the filter 14 from the passage 26 of the filter attachment point 17, is filtered while passing through the filter element 15, and the already filtered fluid is introduced. It enters into the hollow bolt 18 through the port 22, flows into the passage 27 of the filter mounting portion 17, and circulates to the engine. However, when it is difficult for the fluid to pass through the filter element 15 due to the clogging of the filter element 15 or the like, the fluid flows around the filter element 15 as shown in FIGS. Head toward the inlet 23. Then, it overcomes the leaf spring piece, flows into the conduit from the introduction port 23, and flows toward the filter mounting portion 17. This makes it possible to compensate for the lack of oil in the engine, for example.

Embodiment 2 As shown in FIG. 7, a cooler 41 includes a cooling core 42, a case 43 for accommodating the cooling core 42, and a hollow bolt 45 for fixing the case 43 to a cooler mounting portion 44. Is equipped with.

The cooling core 42 has a structure in which two ring-shaped plate members are stacked so that an empty chamber 42a is formed therebetween. The cooling cores 42 are stacked in multiple stages and are pressed against the cooler mounting points 44 by a partition member 46 provided on the ceiling side of the case 43. In addition, the cooling core 42 is connected to the cooling core 42 in the same manner as a supply port 47 for communicating the empty chambers 42 a with each other to supply a fluid into each empty chamber 42 a when they are stacked in multiple stages. A discharge port 48 is provided for discharging the fluid cooled in the chamber 42 from the cavities 42a to the outside of the cooling core 42.

A ring 55 is inserted in each cooling core 42 to prevent its collapse, and the cooling cores 42 are sealed and integrated by copper brazing. The central portion of the multi-stage cooling core 42 is hollow, and hollow bolts 45 penetrate upward and downward therethrough.

The hollow bolt 45 also vertically penetrates the center of the case 43, and the tip end of the hollow bolt 45 is screwed into the cooler mounting portion 44, thereby fixing the case 43 to the cooler mounting portion 44.

The hollow bolt 45 also serves as a fluid conduit, and an inlet 49 for the already-cooled fluid is formed at a location facing the inner peripheral surface of the cooling core 42. Further, at a location corresponding to a space between the ceiling of the case 43 corresponding to the supply port 47 of the uppermost cooling core 42 and the upper surface of the cooling core 42, the cooling core 42 flows straight through, that is, the cooling core 42. An inlet port 50 for introducing the uncooled fluid flowing between the supply ports 47 without flowing into the empty chamber 42a is formed.

Inside the hollow bolt 45, there is provided a relief valve which allows the flow of the uncooled fluid from the inlet 50 side to the side of the cooled fluid inlet 49 and prevents the flow in the opposite direction. ing. That is, reference numeral 51 indicates a valve element of a relief valve provided in the conduit between the inlet 49 for the cooled fluid and the inlet 50 for the uncooled fluid. The valve body 51 is a leaf spring piece, which is curved like a ring as in FIG. 4, and is fixed to the hollow bolt 45 with a rivet 52 at the center thereof. Both blades of the plate panel block the inlet 50 for the uncooled fluid. Since the leaf spring piece is formed to have a diameter slightly larger than the inner diameter of the hollow bolt 45, the inner wall surface of the conduit is in close contact with the inner wall surface as a valve seat. The leaf spring piece is curved and separated from the valve seat only when the pressure of the fluid flowing into the conduit from the uncooled fluid inlet 50 overcomes the pressing force of the leaf spring piece.

Then, as shown in FIG. 7, the fluid such as oil flows into the cooler 41 from the passage 53 of the cooler mounting portion 44, and is cooled while passing through the empty chambers 42 a in the respective cooling cores 42. From the inlet 49 of the already-cooled fluid, it enters the hollow bolt 45, flows into the passage 54 of the cooler attachment point 44, and circulates to the engine or the like. However, when it is difficult to flow like oil in cold weather, the fluid passes through the cooling core 42 and goes to the inlet 50 for the uncooled fluid. Then, it overcomes the leaf spring piece, flows into the conduit from the inlet 50, and flows toward the cooler attachment point 44. This makes it possible to compensate for the lack of oil in the engine, for example.

[0032]

[Effect of the device]

 According to the present invention, since the leaf spring piece also serves as the conventional valve element, compression coil spring, etc., the structure of the relief valve can be simplified and the assembling can be simplified.

Further, since only the leaf spring piece is present in the fluid in the conduit and no compression coil spring, pin or the like is present, the hollow bolt can be shortened and the filter can be downsized.

Further, since the compression coil spring or the like is not present in the fluid passage, the flow of the filtered fluid or the cooled fluid can be smoothed.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a filter including a relief valve according to the present invention.

FIG. 2 is a partially cutaway sectional view showing a relief valve in operation.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a horizontal sectional view of the relief valve.

FIG. 5 is a partially cutaway sectional view of a filter including a conventional relief valve.

FIG. 6 is a partially cutaway sectional view showing a state in which a conventional relief valve is operating.

FIG. 7 is a partially cutaway sectional view of a cooler including a relief valve according to the present invention.

FIG. 8 is a partially cutaway sectional view of a cooler having a conventional relief valve.

[Explanation of symbols]

 15 ... Filter element 22 ... Introduced port of filtered fluid 23 ... Introduced port of unfiltered fluid 18 ... Hollow bolt 24 ... Valve body 42 ... Cooling core 49 ... Introduced port of cooled fluid 50 ... Introduced port of uncooled fluid 51 ... Valve body 45 ... Hollow bolt

Claims (2)

[Scope of utility model registration request] 1. An inlet for an already filtered fluid filtered by a filter element and an inlet for an unfiltered fluid that bypasses the filter element are provided in a conduit in the filter, and the already filtered fluid in the conduit is provided. In a relief valve of a filter in which a valve body of a relief valve is provided between an inlet of the filter and an inlet of the unfiltered fluid, the valve body is a leaf spring piece fixed in the conduit, A relief valve for a filter, characterized in that a piece blocks the inlet of the unfiltered fluid. 2. An inlet for a cooled fluid cooled by a cooling core and an inlet for an uncooled fluid flowing through the cooling core are provided in a conduit in a cooler, and the cooled fluid in the conduit is provided. In a relief valve of a cooler in which a valve body of a relief valve is provided between an inlet port of an uncooled fluid and an inlet port of an uncooled fluid, the valve body is a leaf spring piece fixed in the conduit, A relief valve for a cooler, characterized in that a piece blocks the inlet for the uncooled fluid.