JP4881698B2 - Filtration device, filtration structure - Google Patents

Description

The present invention relates to a filtration device for filtering liquid circulating through a hydraulic circuit in a hydraulic circuit of a hydraulic device including, for example, a hydraulic actuator. The present invention also relates to a filtration structure comprising the filtration device.

  For example, in the hydraulic circuit, a filtration device that filters liquid such as hydraulic fluid that circulates in the hydraulic circuit is installed. In this type of filtration device, elements that have been used to some extent need to be replaced periodically.

  As a structure of the filtration device, the element is provided with a filter medium formed in a cylindrical shape and is substantially cylindrical. The structure of the filtration device is a structure in which the dust contained in the hydraulic oil is collected by the element by passing the hydraulic oil before filtration from the outside to the inside, specifically the filter medium, from the outside to the inside. is there.

As this type of filtration device, a structure including an element and a case for accommodating the element inside has been proposed. In the case, hydraulic oil before filtration is filled between the outer peripheral surface of the filter element. As the hydraulic oil passes through the element from the outside to the inside, dust in the hydraulic oil is collected by the element (specifically, a filter medium) (see, for example, Patent Document 1).
JP 2004-106099 A

  In the filtering device described in Patent Document 1, when an element is taken out from the case when the element is exchanged, dust attached to the outer peripheral surface of the element falls into the case.

  However, in the filtration device having a structure as described in Patent Document 1, the hydraulic oil filled between the case and the outer peripheral surface of the element is in a state before being filtered by the element.

  Therefore, even if dust attached to the outer peripheral surface of the element falls into the case when the element is taken out, the dust is collected again by the newly attached element.

  In this way, an element and a storage chamber such as a tank that stores the element and stores the hydraulic oil before being filtered by the element are provided, and the hydraulic oil passes through the element from the outside to the inside. If it is the structure which collects the dust in hydraulic fluid, the dust which falls in a storage chamber by taking out an element will be collected again by the element newly attached.

  On the other hand, as a structure of the filtering device, there is a structure in which the working oil collects dust in the working oil by passing through the element from the inside to the outside. In the filtering device having this type of structure, the dust in the hydraulic oil adheres to the inner peripheral surface of the element (specifically, the filter medium), and is filtered between the storage chamber and the element, that is, outside the element. Filled hydraulic fluid is filled.

  Therefore, in a filtering device having this type of structure, when an element is removed from the storage chamber, such as when the element is replaced, dust existing inside the element falls into the storage chamber, and dust filled inside the storage chamber is removed. The contained hydraulic fluid is also mixed with the filtered hydraulic fluid in the storage chamber.

As a result, the dust is returned again into the hydraulic oil in the storage chamber, and the hydraulic oil containing the collected dust may return to the hydraulic circuit. It is not preferable that the collected dust is returned to the hydraulic circuit again. Therefore, the object of the present invention is to suppress the collected dust from returning to the hydraulic circuit when the element is replaced. It is providing the filtration apparatus which can do. Moreover, the objective of this invention is providing the filtration structure provided with the said filtration apparatus.

  The filtration device of the present invention includes an element and a lid mechanism. The element is cylindrical and has an element inlet that guides the liquid to be filtered inside at one end, and the dust in the liquid to be filtered passes through the liquid to be filtered from the inside toward the outside. To collect. The lid mechanism covers the element inlet so as to be openable and closable.

  According to this structure, the dust that has accumulated inside the element is prevented from falling by closing the element inlet when the element is replaced.

The lid mechanism includes a lid member, an urging member, and a drive member. The lid member is movable between a first position that covers the element inlet and a second position that opens the element inlet. It said biasing member biases said cover member to said first position. It said drive member passes through the inside of the element with is provided in the lid member through said element and said cover member and the load to overcome the biasing force of the biasing member in the axial direction of the element is applied It moves to the second position.

  According to this structure, the element inlet port is opened simply by pressing the drive member.

Moreover, the filtration structure of this invention is equipped with a filtration apparatus and the storage chamber which accommodates the said filtration apparatus inside. The filtration device includes an element and a lid mechanism. The element is cylindrical and has an element inlet that guides the liquid to be filtered inside at one end, and the dust in the liquid to be filtered passes through the liquid to be filtered from the inside toward the outside. To collect. The lid mechanism comprises a first cover member movable between a first position and the element inlet open mouth second position covering the element inlet, said first said first cover member a biasing member for biasing the position, through the interior of the element with is provided in the first lid member through said element, and the biasing force of the biasing member in the axial direction of the element said a load overcoming is applied first cover member and a drive member that moves in the second position.

The storage chamber includes a wall portion and a second lid member. The wall portion is provided with a take-out hole through which the filtration device can be inserted, facing one end of a portion protruding from the element in the drive member of the filtration device in a state of being installed in the storage chamber . It said second cover member, as well as close the passage hole can be opened and closed, moving the first lid member in contact with one end of the drive member to the second position in a state in which closes the passage hole .

  According to this structure, when the operation of removing the second lid member is performed, the element inlet is closed.

  ADVANTAGE OF THE INVENTION According to this invention, when exchanging an element, it can suppress that the collected dust returns to a hydraulic circuit.

  A filtration structure according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the filtration structure 10. As shown in FIG. 1, the filtration structure 10 includes a storage chamber 20 and a filtration device 30 stored in the storage chamber 20.

  The storage chamber 20 is a part of a hydraulic circuit 21 provided in, for example, a hydraulic actuator (not shown). A part of the hydraulic circuit 21 is shown in the figure. In the hydraulic circuit 21, hydraulic oil L for driving the hydraulic actuator described above circulates.

  A filtration device 30 is accommodated in the storage chamber 20. The filtering device 30 filters the hydraulic oil L. The hydraulic oil L1 before being filtered by the filtering device 30 in the hydraulic oil L is an example of the liquid to be filtered in the present invention.

  On the right side of the storage chamber 20 in the drawing, an inlet 22 is formed for guiding the hydraulic oil L (the hydraulic oil L1 to be filtered) into the storage chamber 20. Further, an outlet 23 for returning the hydraulic oil L2 filtered by the filtering device 30 to the hydraulic circuit 21 is formed on the left side of the storage chamber 20 in the drawing. The storage chamber 20 will be described in detail later. The hydraulic oil L is a concept including the hydraulic oil L1 to be filtered and the filtered hydraulic oil L2.

  The filtration device 30 includes an outer cylinder 31, an element 32, a base 33, and a lid mechanism 34. FIG. 2 is a cross-sectional view showing how the outer cylinder 31 and the element 32 are disassembled. As shown in FIG. 2, the outer cylinder 31 is, for example, substantially cylindrical and has one end closed and the other end opened.

  A plurality of communication holes 36 are formed in substantially the entire area of the peripheral wall 35 of the outer cylinder 31. The communication hole 36 communicates the inside and the outside of the peripheral wall 35. In addition, although a part of the communication hole 36 is shown in the drawing, it is actually formed in the entire area. The outer cylinder 31 has a function of suppressing the filter medium 37 of the element 32 described later from spreading outward.

  As shown in FIG. 1, the element 32 is accommodated in the outer cylinder 31. As shown in FIG. 2, the element 32 includes a filter medium 37, a first plate 38, a second plate 39, and an inner cylinder 40.

  For example, the filter medium 37 is folded into a pleat shape and is formed in a substantially cylindrical shape. The filter medium 37 filters the dust contained in the hydraulic oil L1 by passing the hydraulic oil L1 in a direction crossing the axial direction.

  The first plate 38 supports the first end 41 of the filter medium 37. The first end portion 41 is an end portion located at the upper side in the figure, and faces the closed end of the outer cylinder 31. The first plate 38 covers the opening of the first end portion 41 of the filter medium 37 (the end portion of the inner cylinder 40 described later).

  The second plate 39 supports the second end portion 42 of the filter medium 37. Note that the second end portion 42 is an end portion located in the lower part of the drawing. The second plate 39 faces the open end of the outer cylinder 31. An element inflow port 43 penetrating the second plate 39 is formed in a portion corresponding to the inside of the filter medium 37 in the second plate 39.

  The inner cylinder 40 is, for example, cylindrical and is accommodated inside the filter medium 37 and is disposed concentrically with the filter medium 37. One end of the inner cylinder 40 is integrated with the first plate 38. The other end is integrated with the second plate 39. The inner cylinder 40 has a function of suppressing the filter medium 37 from being deformed inward.

  The element 32 configured as described above is accommodated in the outer cylinder 31 concentrically with the outer cylinder 31. At this time, the element 32 is accommodated in the outer cylinder 31 so that the second plate 39 faces the opening end of the outer cylinder 31.

  FIG. 3 is an enlarged cross-sectional view showing the range of F3 shown in FIG. FIG. 3 shows the vicinity of the second plate 39 in the filtration device 30. As shown in FIG. 3, the element 32 is large enough to be accommodated up to the second plate 39 in the outer cylinder 31 in the axial center line direction of the element 32, and on the second plate 39 side of the inner cylinder 40. The distal end portion 44 is formed so as to exit from the outer cylinder 31.

  As shown in the figure, a communication hole 45 that communicates the inside and the outside of the inner cylinder 40 is formed in substantially the entire area of the inner cylinder 40. The hydraulic oils L1 and L2 pass through the communication holes 36 and 45.

  As shown in FIGS. 1 and 3, the base 33 is fixed to the inlet 22 of the hydraulic circuit 21. The base 33 includes a base inlet 46 connected to the inlet 22, and a base outlet 47 that guides the hydraulic oil L <b> 1 before being filtered inside the element 32. The base inlet 46 and the base outlet 47 communicate with each other.

  As shown in FIG. 3, the distal end portion 44 of the inner cylinder 40 (the end portion that exits from the outer cylinder 31 in the inner cylinder 40) is inserted into the base outlet 47. Specifically, a contact portion 48 that contacts the periphery of the base outlet 47 is formed at the distal end portion 44 of the inner cylinder 40. The distal end portion 44 is inserted until the abutting portion 48 abuts on the peripheral edge of the base outlet 47.

  An O-ring 49 is provided around the distal end portion 44 as an example of a seal member. Therefore, the space between the base outlet 47 and the distal end portion 44 is liquid-tightly sealed.

  In addition, the base 33 is provided with a relief valve 50 that performs a pleasant valve operation when the pressure in the base 33 (pressure of the hydraulic oil L1) becomes excessive.

  As shown in FIG. 1, the lid mechanism 34 includes a drive rod 51, a first lid member 52, a first guide member 53, a second guide member 54, and an urging mechanism 55. .

  The drive rod 51 is housed inside the element 32, is disposed on the axis of the element 32 (in the inner cylinder 40), and extends along the axis of the element 32. An insertion hole 100 through which the drive rod 51 is inserted is formed in the first plate 38. The communication hole 56 is inserted through the drive rod 51 so as to be movable. The gap between the insertion hole 100 and the drive rod 51 is small so that the hydraulic oil L1 does not leak.

  The 1st cover member 52 covers the element inflow port 43 so that opening and closing is possible. FIG. 4 is a perspective view showing the first lid member 52. As shown in FIGS. 1 and 4, the first lid member 52 is, for example, a tapered cylindrical shape that gradually spreads from one end 57 (upper end in the figure) to the other end 58 (lower end in the figure). A plurality of (in this embodiment, four as an example) communication holes 56 are formed in the peripheral wall. The communication hole 56 communicates the inside and the outside of the first lid member 52.

  One end portion 57 of the first lid member 52 is opened so as to communicate the inside and the outside in the axial direction of the first lid member 52. The other end 58 is closed. The first lid member 52 is sized to be accommodated in the inner cylinder 40 from the one end portion 57 through the element inlet 43.

  FIG. 5 is an enlarged cross-sectional view showing a state in which the first lid member 52 is accommodated in the inner cylinder 40 from the element inlet 43 and the element inlet 43 is liquid-tightly closed. . As shown in FIG. 5, the other end 58 of the first lid member 52 is larger than the element inlet 43, and therefore the first lid member 52 is accommodated in the inner cylinder 40 from the element inlet 43. Then, the other end 58 abuts on the peripheral edge of the element inlet 43 and closes the element inlet 43 in a liquid-tight manner.

  Further, when the other end 58 of the first lid member 52 moves along the axis of the first lid member 52, that is, the axis of the inner cylinder 40 so as to be separated from the peripheral edge of the element inlet 43, the element flow The inlet 43 is opened.

  The position where the element inflow port 43 is blocked in the first lid member 52 is the first position P1. The position where the element inlet 43 is opened is the second position P2. When the first lid member 52 is in the second position P2, the hydraulic oil L1 flowing in from the base inlet 46 passes through the communication hole 56 of the first lid member 52 and passes through the opening of the one end 57. Enter the tube 40.

  As shown in FIG. 3, in the base 33, the space S1 between the base outlet 47 and the base inlet 46 is located between the first lid member 52 and the second position P2. It has a size that can be moved by.

  As shown in FIGS. 3 and 5, the first lid member 52 is fixed to the drive rod 51. Specifically, the tip 51a of the drive rod 51 is fixed to the other end 58 of the first lid member 52 by, for example, screwing. Therefore, the other end 58 is closed. The fixing structure is an example and is not limited to screwing.

  As shown in FIGS. 1 and 2, the first guide member 53 is disposed on the axial center line of the outer cylinder 31 at the closed end of the outer cylinder 31, and has a cylindrical shape protruding outward. An end of the first guide member 53 that faces the outer cylinder 31 is open. The other end is closed. Insertion holes 60 and 61 through which the drive rod 51 is movably inserted are formed at the closed end of the outer cylinder 31 and the closed end of the first guide member 53.

  The second guide member 54 is fixed to the inner side of the insertion hole 60 of the outer cylinder 31 (periphery of the insertion hole 60), and protrudes toward the inner side of the first guide member 53. The second guide member 54 is formed with an insertion hole through which the drive rod 51 is movably inserted. A predetermined space is defined between the tip end of the second guide member 54 and the other end portion of the first guide member 53 being closed.

  When the drive rod 51 passes through the insertion holes 61 and 62 of the first and second guide members 53 and 54, the movement of the drive rod 51 becomes stable.

  The urging mechanism 55 includes a spring 63 and a spring receiving member 64. The spring receiving member 64 is fixed to the drive rod 51. Specifically, the spring receiving member 64 is a part of the drive rod 51 that is accommodated in a space S <b> 2 defined between the closed end of the first guide member 53 and the tip of the second guide member 54. It is fixed. The spring receiving member 64 has a flange shape and extends in a direction crossing the axial direction of the drive rod 51.

  The spring 63 is disposed between the tip of the second guide member 54 and the spring receiving member 64. As described above, since the second guide member 54 is fixed to the outer cylinder 31, the spring receiving member 64 is urged toward the closed end of the first guide member 53 by the spring 63. That is, the drive rod 51 is biased upward in FIG. As a result, the first lid member 52 is biased to the first position P1. The spring 63 is an example of an urging member referred to in the present invention.

  Here, the structure of the storage chamber 20 will be specifically described. As shown in FIG. 1, the storage chamber 20 includes a wall portion 24 that faces the distal end side of the drive rod 51 (the distal end side of the portion protruding from the outer cylinder 31). In the wall 24, a take-out hole 25 is formed at a location facing the filtration device 30 installed in the storage chamber 20 along the axial direction of the element 32 (drive rod 51).

  The take-out hole 25 is used when the element 32 is installed in the storage chamber 20 or when the element 32 is taken out from the storage chamber 20. The extraction hole 25 has a size through which the element can pass.

  A second lid member 26 is detachably installed in the take-out hole 25. The second lid member 26 closes the extraction hole 25 in a liquid-tight manner. A support protrusion 27 is formed on the surface of the second lid member 26 facing the inside of the storage chamber 20. The support protrusion 27 protrudes into the storage chamber 20. A connecting member 65 is provided between the drive rod 51 and the support protrusion 27. The connecting member 65 is fixed to the drive rod 51, and a fitting hole 65 a that engages with the support protrusion 27 is formed at the end on the support protrusion 27 side. Therefore, when the second lid member 26 covers the take-out hole 25, the support protrusion 27 is fitted into the fitting hole 65a.

  The length of the drive rod 51 and the connecting member 65 is long enough for the first lid member 52 to be positioned at the second position P2 when the second lid member 26 covers the take-out hole 25. have. The drive rod 51 and the connecting member 65 constitute a drive member referred to in the present invention. Therefore, when the second lid member 26 covers the take-out hole 25, the first lid member 52 overcomes the urging force of the spring 63 against the connecting member 65 and the drive rod 51 by the second lid member 26. Is applied to the second position P2.

  Next, the operation of the filtration device 30 will be described.

  When the filtering device 30 is installed in the storage chamber 20, as shown in FIG. 1 and described above, the first lid member 52 is positioned at the second position P2. Therefore, the hydraulic oil L1 flowing in the hydraulic circuit 21 passes through the base inlet 46, the communication hole 56 of the first lid member 52, the base outlet 47, and the element inlet 43, and enters the inside of the element 32. Break into.

  The hydraulic oil L1 that has entered the inside of the element 32 passes through the filter medium 37 from the inside toward the outside, as indicated by an arrow in FIG. In this process, the dust contained in the hydraulic oil L1 is collected by the filter medium 37. Therefore, a relatively large amount of dust adheres to the inner surface of the filter medium 37. As a result, the filtered hydraulic oil L2 is filled between the storage chamber 20 and the filtering device 30. The filtered hydraulic oil L2 returns from the outlet 23 to the hydraulic circuit 21.

  FIG. 6 is a cross-sectional view showing when the element 32 is taken out from the storage chamber 20 or when the element 32 is installed in the storage chamber 20. As shown in FIG. 6, the element 32 is replaced after a predetermined period. When the element 32 is replaced, the second lid member 26 is removed.

  When the second lid member 26 is removed, the load applied to the drive rod 51 by the second lid member 26 is released, so that the drive rod 51 is urged by the urging force of the spring 63. Is moved from the second position P2 to the first position P1. As a result, the element inlet 43 is liquid-tightly closed.

  When the element inlet 43 is closed in a liquid-tight manner, the element 32 is removed from the base 33. Next, the element 32 is removed from the storage chamber 20. At this time, since the element inlet 43 is liquid-tightly closed by the first lid member 52, the dust accumulated inside the element 32 and the hydraulic oil L1 to be filtered accumulated inside the element 32 are There is no leakage outside through the inlet 43.

  When a new element 32 is newly installed on the base 33, the element 32 is installed on the base 33 through the take-out hole 25. At this time, the distal end portion 44 of the inner cylinder 40 is inserted into the base outlet 47.

  Next, the second lid member 26 is attached to the take-out hole 25. When the second lid member 26 is attached, as shown in FIG. 1, the support protrusion 27 is fitted into the fitting hole 65a, and the connecting member 65 and the drive rod 51 are urged by the second lid member 26. The first lid member 52 moves from the first position P1 to the second position P2.

  In the filtration structure 10 configured as described above, the element inflow port 43 is liquid-tightly closed when the element 32 is installed in the storage chamber 20 (base 33) and when it is removed. Therefore, the dust accommodated inside the element 32 is prevented from falling into the filtered hydraulic oil L2. As a result, the collected dust is prevented from returning to the hydraulic circuit 21 when the element 32 is replaced.

  In the lid mechanism 34, the element inlet 43 is urged in a direction that is always closed by the spring 63, and the element inlet 43 is opened only by pressing the drive rod 51. Is simple.

  In addition, since the structure is such that the force applied to the drive rod 51 is released by simply removing the second lid member 26 and the first lid member 52 returns to the first position P1, the operation to remove the second lid member 26 By simply doing, the element inlet 43 is naturally closed in a liquid-tight manner.

  Therefore, the replacement work of the element 32 is simplified. Furthermore, since the second lid member 26 is used, the structure is relatively simple.

Sectional drawing which shows the filtration structure which concerns on one Embodiment of this invention. The perspective view which cut | disconnects along a shaft center line of a drive rod, and shows a mode that the outer cylinder and element which were shown by FIG. 1 are decomposed | disassembled. Sectional drawing which expands and shows the range of F3 shown in FIG. The perspective view which shows the 1st cover member shown by FIG. Sectional drawing which expands and shows the state which has the 1st cover member shown by FIG. 1 in a 1st position. Sectional drawing which shows the time of taking out an element from the storage chamber shown in FIG. 1, or the time of installing an element in a storage chamber.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Filtration structure, 20 ... Storage chamber, 24 ... Wall part, 25 ... Extraction hole, 26 ... 2nd cover member, 30 ... Filtration apparatus, 32 ... Element, 34 ... Cover mechanism, 43 ... Element inflow port, 51 ... Drive rod (drive member), 52 ... first lid member, 63 ... spring (biasing member), 65 ... connecting member (drive member), P1 ... first position, P2 ... second position.

Claims (2)

It is cylindrical and has an element inlet for guiding the liquid to be filtered inside at one end, and the dust in the liquid to be filtered is collected by passing the liquid to be filtered from the inside toward the outside. Elements,
A lid mechanism that covers the element inlet so as to be openable and closable ,
The lid mechanism is
A lid member movable between a first position covering the element inlet and a second position opening the element inlet;
A biasing member that biases the lid member to the first position;
When a load is provided on the lid member and passes through the element through the inside of the element and overcomes the urging force of the urging member in the axial direction of the element, the lid member is moved to the second position. And a drive member that moves to the filter. A filtration device;
A storage chamber for storing the filtration device inside;
The filtration device
It is cylindrical and has an element inlet for guiding the liquid to be filtered inside at one end, and the dust in the liquid to be filtered is collected by passing the liquid to be filtered from the inside toward the outside. Elements,
A first cover member movable between a first position and the element inlet open mouth second position covering the element inlet, biasing said first cover member to the first position a biasing member which, the conjunction provided in the first lid member through the interior of the element through the element and, when the load to overcome the biasing force of the biasing member in the axial direction of the element is applied a lid mechanism comprising a drive member for moving the first lid member to said second position,
Comprising
The containment chamber is
A wall portion provided with a take-out hole through which the filtration device can be inserted, facing one end of a portion protruding from the element in the drive member of the filtration device in a state installed in the storage chamber ;
Together close the passage hole openably, and a second cover member which moves said first cover member in contact with one end of the drive member to the second position in a state in which closes the passage hole The filtration structure characterized by doing.

Images