JP2008080295A - Filtering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent a fluid from leaking from a joint part and the joint part from coming off in even an adhesion-type channel joint with a filter head. <P>SOLUTION: In a filtering device 101 having a basic structure that a filter head 104 is fixed under seal to an opening of a housing 102 of a filter element that is open at one end, the channel joint 108 is pressed to adhere to a fluid inlet 106 installed at the filter head 104 connecting the outside of the filter head 104 and the inside of the housing 102. A joint structure of a concave-convex fitting between the fluid inlet 106 and the channel joint 108 prevents the joint between the fluid inlet 106 and the channel joint 108 from loosening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filter device for filtering fluid such as fuel, water, oil, and air.

  The filter device may employ a structure in which a flow path joint is jointed to an inlet and an outlet of a fluid to be filtered provided in the filter head.

  FIG. 7 is a front view showing an example of a conventional filter device. A filter head 2 is hermetically fixed to an opening portion of a housing 1 containing a filter element (not shown). The filter head 2 has an inlet 3 for introducing a fluid to be filtered into the filter device and an outlet 4 for discharging the filtered fluid from the filter device. In FIG. 7, the discharge port 4 is slightly visible beyond the introduction port 3. A flow path joint 5 is attached to the introduction port 3. The flow path joint 5 has a shape that bends the direction of a fluid flow path (not shown) formed therein at a right angle.

  FIG. 8 is a perspective view showing a joint structure between the filter head 2 and the flow path joint 5. The leading end of the flow path joint 5 is press-fitted into the inlet 3 of the filter head 2. In this case, the flow path joint 5 can take a desired angle with respect to the filter head 2. As a measure for fixing the flow path joint 5 after press-fitting, for example, a technique called adhesive fixation is employed.

JP 2000-220970 A JP 2004-060940 A

  A filter device having a structure in which a flow passage joint (flow passage joint 5) is jointed to a fluid introduction port (introduction port 3) as illustrated in FIG. 7, for example, fuel or oil in an engine, a machine tool, or the like. Used for filtration. However, when actually used, there have been reports of accidents in which the fluid to be filtered leaks from the joint part, or in the worst case, the joint part comes off. Such leakage of fluid at the joint portion and separation of the joint portion are caused by peeling of the adhesive. Therefore, as described in Patent Documents 1 and 2, it is conceivable that the joint portion is a bolted connection structure. However, this complicates the structure and causes an increase in cost.

  An object of the present invention is to reliably prevent leakage of fluid from the joint part and separation of the joint part while using a technique called adhesion as a technique for fixing the flow path joint to the filter head.

  The filter device according to the present invention includes a housing having an opening for housing a filter element, a filter head hermetically fixed to an opening portion of the housing, an outside of the filter head provided on the filter head, and the housing. A communication hole that communicates with the interior of the communication hole, a flow path joint that is press-fitted into the communication hole and bonded and fixed thereto, and a joint between the communication hole and the flow path joint is formed into a concave-convex fitting, and the communication hole and the flow path A joint structure for preventing the joint from rotating.

  According to the present invention, since the joint between the communication hole and the flow path joint in the joint structure is an uneven fitting, free rotation of the flow path joint side with respect to the filter head side having the communication hole is suppressed, thereby , It is possible to prevent the peeling of the adhesive that fixes the flow path joint caused by the rotation of the flow path joint with respect to the filter head. As a result, leakage of fluid from the joint part and separation of the joint part can be prevented. It can be surely prevented.

  An embodiment of the present invention will be described with reference to FIGS. This embodiment is an application example to a fuel filter device that filters fuel.

  FIG. 1 is a front view of the filter device 101. The filter device 101 according to the present embodiment is provided with a cylindrical housing 102 containing a cylindrical filter element (not shown), and a drain unit 103 is provided at one opening portion (lower opening in FIG. 1) of the housing 102. The filter head 104 is hermetically fixed to the other opening (upper opening in FIG. 1). The drain unit 103 has a drain plug 105 for draining water accumulated inside the housing 102, and is configured so that unnecessary water can be drained from the drain plug 105. The filter head 104 includes a fluid inlet 106 for introducing fuel to be filtered into the filter device 101 and a fluid outlet 107 for discharging the filtered fuel from the filter device 101. In FIG. 1, the fluid outlet 107 is slightly visible beyond the fluid inlet 106. The fluid inlet 106 and the fluid outlet 107 function as communication holes that allow the outside of the filter head 104 to communicate with the inside of the housing 102. Although the structure of the filter device 101 is not shown, the fuel introduced from the fluid inlet 106 is guided to the lower part of the housing 102, and in the process, the fuel is filtered by the filter unit housed in the housing 102. The fuel after being filtered through an inner pipe (not shown) disposed at the center of 102 is guided to the fluid discharge port 107 and discharged from the fluid discharge port 107 to the outside.

  A flow path joint 108 for connecting a fuel pipe (not shown) to the fluid inlet 106 is attached to the fluid inlet 106 provided in the filter head 104. The flow path joint 108 is L-shaped, and the direction of the fluid flow path 108a formed therein is bent at a right angle. One piece of the L-shaped channel joint 108 is a head joint portion 109 and the other piece is a pipe joint portion 110. The head joint portion 109 is a portion that is jointed to the fluid inlet 106 of the filter head 104, and the pipe joint portion 110 is a portion that is joined to the fuel pipe. The joint of the fuel pipe to the pipe joint part 110 is performed by fitting a flexible fuel pipe to the pipe joint part 110 and tightening with a fastener (not shown). Therefore, a node portion 111 is formed on the outer peripheral surface of the pipe joint portion 110 so that the fuel pipe does not easily fall off.

  FIG. 2 is a perspective view showing a joint structure 112 between the filter head 104 and the flow path joint 108. The joint structure 112 prevents the fluid introduction port 106 and the flow path joint 108 from rotating by fitting the joint between the fluid introduction port 106 and the flow path joint 108 of the filter head 104 into a concave and convex shape. As a structure for this purpose, the fluid inlet 106 of the filter head 104 includes a serration groove 113 at the front, and a step 114 at the end of the serration groove 113 on the back side. The back side of the step 114 is an adhesive fixing region 115 having a smaller diameter than the arc connecting the tip portions of the serration grooves 113. The flow path joint 108 includes a serration 116 at the center portion of the head joint portion 109, and a perfect circle fitting portion 117 at a portion from the serration 116 to the tip end portion. The serration 116 formed in the flow passage joint 108 fits into the serration groove 113 formed in the fluid introduction port 106 with little play, and the perfect circle fitting portion 117 formed in the flow passage joint 108 has a fluid introduction port. It is press-fitted into the adhesive fixing region 115 formed in 106. Further, the flow path joint 108 is press-fitted into the fluid introduction port 106 until the serration groove 113 comes into contact with the stepped portion 114 formed in the fluid introduction port 106. Since the flow path joint 108 is jointed to the fluid introduction port 106 in a state where an adhesive is applied to the perfect circle fitting portion 117, the filter head is bonded by the adhesion of the perfect circle fitting portion 117 to the adhesion fixing region 115. The adhesive is fixed to 104.

  FIG. 3 is a front view of the head joint 109 with respect to the filter head 104 included in the flow path joint 108. Eight serrations 116 included in the flow path joint 108 are provided. In addition, eight pieces are not provided at equal angular intervals, but three pieces are arranged on the left and right sides in FIG. 3 and one piece is arranged on the upper and lower sides. The three serrations 116 on the left and right sides in FIG. 3 are arranged at an angular interval of 30 °. Therefore, if the serrations 116 are formed over 360 degrees around the head joint 109 of the flow path joint 108, the number is twelve. Therefore, the serration 116 is 0 ° (the serration 116 located at the highest position), 60 with respect to a straight line connecting the center of the head joint portion 109 and the tip of the serration 116 located at the highest position in FIG. The tips are arranged so as to be positioned at positions of °, 90 °, 120 °, 180 °, 240 °, 270 °, and 300 °. Serrations 116 are not provided at positions of 30 °, 150 °, 210 °, and 330 °.

  The number of the serrations 116 arranged in this way is set as a number that does not hinder die cutting centering on a two-part dividing line passing through the center of the head joint portion 109 in the flow path joint 108. The reason is that the flow path joint 108 is manufactured by a simple two-part split method without using a core, in consideration that the flow path joint 108 is manufactured by a die-cutting manufacturing method such as aluminum die casting or zinc die casting. This is to make it possible.

  In addition, the serration 116 is formed symmetrically about a two-part dividing line passing through the center of the head joint portion 109 in the flow path joint 108. This contributes to improving the manufacturing accuracy when manufactured by the die-cutting manufacturing method.

  On the other hand, the serration groove 113 formed on the fluid introduction port 106 side is formed over the inner circumference 360 degrees of the fluid introduction port 106. Therefore, the number is 12 (see FIG. 2). Therefore, in FIG. 3, the serration 116 is provided at a position that forms 30 °, 150 °, 210 °, and 330 ° with respect to a straight line connecting the center of the head joint portion 109 and the tip of the serration 116 positioned at the highest position. Even if not, the flow path joint 108 can be jointed to the filter head 104 at a free angular interval of every 30 °. In addition, since the serrations 116 are provided in a certain number of eight, and are formed symmetrically around the two-part dividing line passing through the center of the head joint portion 109 in the flow path joint 108, good rotation is achieved. A stopping effect can be brought about.

  FIG. 4 is a front view showing a joint structure 112 between the filter head 104 and the flow path joint 108. As shown in FIG. 4, the serration 116 on the flow path joint 108 side is fitted in the serration groove 113 on the fluid inlet 106 side with almost no play.

  In such a configuration, the filter device 101 filters the fuel introduced from the fluid introduction port 106 via a fuel pipe and flow path joint 108 (not shown) through a filter unit (not shown), and discharges the fuel from the fluid discharge port 107 to obtain the fuel. To achieve filtration. When filtering such fuel, the filter device 101 of this embodiment can withstand aging and reliably prevent fuel leakage from the joint portion between the filter head 104 and the flow path joint 108 and the separation of the joint portion. can do. The reason will be described next.

  As an example, the filter device 101 is mounted on a vehicle together with an internal combustion engine. For this reason, it receives the vibration of the internal combustion engine itself and the vibration accompanying the running of the vehicle. The inventor of the present invention has found that such vibration transmitted to the filter device 101 causes fuel leakage from the joint portion between the filter head 104 and the flow path joint 108 and separation of the joint portion. Elucidated. That is, when vibration is transmitted to the filter device 101, the flow passage joint 108 jointed with the filter head 104 tries to rotate. In this case, if the filter device 101 is mounted alone on a vehicle or the like, the force that the flow path joint 108 tries to rotate is not so large. On the other hand, a fuel pipe (not shown) is joined to the pipe joint portion 110 of the flow path joint 108. This fuel pipe generally has a certain degree of flexibility, and is held in such a manner that it is shaken by vibration at a joint portion with the flow path joint 108. For this reason, the vibration of the internal combustion engine itself and the vibration accompanying the traveling of the vehicle or the like cause the fuel pipe to sway, thereby applying a rotational force to the flow path joint 108. If the flow path joint 108 is rotated by this force, adhesion between the filter head 104 and the flow path joint 108, more specifically, a perfect circle fit of the head joint portion 109 of the flow path joint 108 is provided. Adhesion between the joint portion 117 and the adhesive fixing region 115 of the fluid inlet 106 of the filter head 104 is peeled off. This is the cause of the leakage of fuel from the joint portion of the filter head 104 and the flow path joint 108 and the detachment of the joint portion, which have been elucidated by the inventors of the present invention.

  On the other hand, in the joint structure 112 of the filter head 104 and the flow path joint 108 in the present embodiment, the joint between the fluid inlet 106 of the filter head 104 and the flow path joint 108 is formed into a concavo-convex fitting by a serration structure, The fluid inlet 106 and the flow path joint 108 are prevented from rotating. As a result, even if a force in the rotation direction is applied to the flow path joint 108 and the force is a considerably strong force, the flow path joint 108 is prevented from rotating with respect to the filter head 104. Further, it is possible to prevent peeling of the adhesive that fixes the flow path joint 108 caused by the rotation of the flow path joint 108 with respect to the filter head 104. As a result, fuel leakage from the joint portion between the filter head 104 and the flow path joint 108 and separation of the joint portion can be reliably prevented.

  5 and 6 are (a) a front view of the filter device and (b) a side view of the filter device as application examples to other filter devices, respectively. The joint structure 112 of the present embodiment can be applied to various types of filter devices as shown in FIGS.

  In the present embodiment, the joint structure 112 between the filter head 104 and the flow path joint 108 is configured such that the joint between the fluid introduction port 106 of the filter head 104 and the flow path joint 108 is concavo-convexly fitted. And the flow path joint 108 are prevented from rotating. In order to realize such uneven fitting, a serration structure is employed in the present embodiment. On the other hand, in practice, any structure such as a key and key groove structure or a knurled structure is adopted as long as the joint between the fluid introduction port 106 and the flow path joint 108 can be formed into an uneven fitting. It is possible.

  Further, in the present embodiment, the filter device 101 has a structure that filters fuel, but the filtering target is not limited to fuel, and may be applied to various types of fluid filtering such as water, air, oil, and the like. .

  Furthermore, in the present embodiment, the joint structure 112 between the fluid inlet 106 and the fluid joint 108 is employed on the fluid inlet 106 side, but a fluid joint corresponding to the fluid joint 108 is also joined to the fluid outlet 107. If a structure is employed, the joint structure 112 may be employed for the joint portion.

It is a front view of the filter apparatus which shows one Embodiment of this invention. It is a perspective view which shows the joint structure of a filter head and a flow path joint. It is a front view of the head joint part with respect to the filter head which a flow path joint has. It is a front view which shows the joint structure of a filter head and a flow path joint. As an application example to another filter device, (a) a front view of the filter device, and (b) a side view of the filter device. As another application example to the filter device, (a) a front view of the filter device, and (b) a side view of the filter device. It is a front view which shows an example of the conventional filter apparatus. It is a perspective view which shows the joint structure of a filter head and a flow path joint.

Explanation of symbols

102 Housing 104 Filter head 106 Fluid inlet (communication hole)
107 Fluid outlet 108 Flow path joint 112 Joint structure 113 Serration groove 116 Serration 117 Full circle fitting part

Claims (8)

A housing that is open on one side for storing the filter element;
A filter head hermetically fixed to the opening of the housing;
A communication hole provided in the filter head for communicating the outside of the filter head and the inside of the housing;
A flow path joint that is press-fitted into the communication hole and bonded and fixed;
A joint structure that prevents the communication hole and the flow path joint from rotating by engaging the joint of the communication hole and the flow path joint with an uneven fitting;
A filter device comprising:   The filter device according to claim 1, wherein the communication hole is a fluid introduction port for introducing a fluid before being filtered by the filter element.   The filter device according to claim 1, wherein the communication hole is a fluid discharge port that is provided in the filter head and discharges the fluid after being filtered by the filter element.   The filter device according to any one of claims 1 to 3, wherein the joint structure includes a perfect circle fitting portion on a tip end side of the flow path joint, and the perfect circle fitting portion is bonded and fixed.   The said joint structure is formed by the serration structure which has the serration groove formed in the said communicating hole side, and the serration formed in the said flow path coupling side and fitting to the said serration groove. 5. The filter device according to any one of 4. The serration groove includes a number of groove portions obtained by dividing 360 by an integer,
The serrations are provided in a number that does not hinder die cutting around a bisecting line passing through the center of the flow path joint.
The filter device according to claim 5.   The filter device according to claim 6, wherein the serration is formed symmetrically with respect to the bisecting line.   The filter device according to claim 6 or 7, wherein the serration grooves and the serrations are arranged at intervals of 30 degrees.

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