JP2012087702A - Connection part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technology of reducing the number of sealing materials in a connection part structure to attach a connecting pipe via a filter member to a pipe attaching object member.SOLUTION: The connection part structure 110 is for detachably attaching a connecting pipe 60 to a suction port 24 provided in a body 40 of a negative pressure pump, and the structure comprises: a filter member 33 to be inserted into the suction port 24; an insertion part 121 provided in the connecting pipe 60 and to be inserted into the suction port 24; a filter advancing part 122 extending from the insertion part 121 and intruding into the filter member 33; and a sealing material 68, which is in contact with the insertion part 121, the suction port 24 and the filter member 33, and seals between the insertion part 121 and the suction port 24 and seals between the filter member 33 and the suction port 24. As the number of the sealing material can be reduced, the cost for the negative pressure pump can be reduced.

Description

  The present invention relates to an improvement in a connection portion structure in which a connection pipe is detachably attached to a pipe attachment member.

  Various techniques have been proposed in which a filter member is interposed between a connection tube and a tube-attached member in a connection portion structure for attaching the connection tube to the tube-attached member (see, for example, Patent Document 1 (FIG. 6)).

Patent document 1 is demonstrated based on the following figure.
FIG. 15 is a view for explaining the basic structure of a conventional connecting portion structure. A suction port 202 is provided in a housing 201 of a gas compressor, a filter member 203 is inserted into the suction port 202, and a sleeve 204 is inserted into the suction port 202. A connection portion structure 200 is disclosed in which a filter member 203 is pressed by a sleeve 204 after insertion of the filter. Then, a connection pipe 205 indicated by an imaginary line is attached to the suction port 202.

  A person skilled in the art who has seen Patent Document 1 generally attaches the connecting pipe and the sealing material as shown in FIG. A sealant 206 seals between the housing 201 and the sleeve 204, and a sealant 207 seals between the housing 201 and the connecting pipe 205. The intake air flows from the connection pipe 205 to the intake port 202 as indicated by the white arrow, and is sent to the compression mechanism portion via the filter member 203.

  Due to the sealing action of the sealing material 206, there is no concern that the intake air passes through the gap 208 between the housing 201 and the sleeve 204. Further, there is no concern that outside air will enter the sleeve 204 due to the sealing action of the sealing material 207.

  Incidentally, there is a demand for cost reduction of parts constituting the connection structure, and in particular, reduction in the number of sealing materials is expected.

JP 2007-162587 A

  It is an object of the present invention to provide a technique capable of reducing the number of sealing materials in a connection portion structure in which a connection pipe is attached to a pipe attachment member via a filter member.

The invention according to claim 1 is a connection part structure in which the connection pipe is detachably attached to the pipe-attached member.
A filter member to be inserted into a port provided in the tube mounting member;
An insertion portion provided in the connection pipe and inserted into the port;
A filter entry portion extending from the insertion portion and entering the filter member;
A single sealing material that contacts the insertion portion, the port, and the filter member, seals between the insertion portion and the port, and seals between the filter member and the port. And

In the invention which concerns on Claim 2, the filter member is equipped with the collar part in the edge part by the side of a connecting pipe,
The connecting pipe is characterized in that a connecting surface between the insertion portion and the filter entry portion is provided with a restraining surface that suppresses the flange portion.

In the invention which concerns on Claim 3, a to-be-tube-attached member is a negative pressure pump,
The port is a suction port of a negative pressure pump.

In the invention according to claim 1, the sealing material is disposed so as to be in contact with the port of the tube mounting member, the filter member inserted into the port, and the insertion portion of the connection tube inserted into the port.
Since a single seal material seals between the insertion portion and the port and seals between the filter member and the port, the number of seal materials can be reduced to one.

In the invention which concerns on Claim 2, the collar part was provided in the edge part by the side of the connection pipe of a filter member, and the suppression surface which suppresses a collar part was provided in the connection part of the insertion part of a connection pipe, and a filter approach part.
By restraining the flange portion with the restraining surface, the movement of the filter member in the axial direction can be restricted, and the filter member can be positioned. Moreover, the vibration of the filter member can be suppressed by the action of the holding surface. That is, the connecting pipe also serves as a stopper for restricting the movement of the filter member. As a result, the space for the port can be saved as much as the stopper is not required.

  In the invention which concerns on Claim 3, a to-be-tube-attached member is a negative pressure pump, and a port is a suction port of a negative pressure pump. That is, the present invention is suitable for a suction port of a negative pressure pump, and the number of sealing materials can be reduced, so that the cost of the negative pressure pump can be reduced.

It is a figure which shows the example of arrangement | positioning of the negative pressure pump provided with the connection part structure which concerns on this invention. It is a disassembled perspective view of a negative pressure pump. It is a disassembled perspective view of a pump part. It is principal part sectional drawing of a negative pressure pump. FIG. 5 is an enlarged view of part 5 of FIG. 4. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4. It is a bottom view of a negative pressure pump. It is a figure explaining an exhaust hole and a plug member. FIG. 10 is a sectional view taken along line 10-10 in FIG. 8. It is the 11-11 line sectional view of FIG. It is a figure explaining the flow of the intake air from a connection pipe to a pump part. It is a figure explaining the flow of the exhaust_gas | exhaustion from a pump part to an exhaust port. It is a figure explaining the effect | action of a some chamber. It is sectional drawing of the conventional connection part structure.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  Embodiments of the present invention will be described with reference to the drawings. The connection part structure will be described below by taking as an example a connection part structure in which a connection pipe is detachably attached to a suction port provided in a negative pressure pump.

As shown in FIG. 1, the negative pressure pump 10 is a type of vacuum pump that applies a negative pressure to the negative pressure chamber 12 of a negative pressure booster 11 provided in a vehicle.
When the negative pressure pump 10 is operated, the negative pressure pipe 13, the negative pressure chamber 12, and the variable pressure chamber 14 are at negative pressure. When the brake pedal 16 is depressed in this state, the negative pressure chamber 12 and the variable pressure chamber 14 are cut off, air is introduced into the variable pressure chamber 14, and the diaphragm 17 is returned to the return spring by the differential pressure between the negative pressure chamber 12 and the variable pressure chamber 14. 18 is deformed to the compression side and push rod 19 is pushed out. As a result, a large braking force can be obtained with a small pedal effort. The negative pressure pump 10 is fixed to the bracket 21 on the vehicle side with bolts 22.

The structure of the negative pressure pump 10 will be described in detail below.
As shown in FIG. 2, the negative pressure pump 10 is attached with a body portion 40 having an intake port 24 at the top, and a plurality of (two in this example) screws 26 on one side surface of the body portion 40. A motor 28 whose motor shaft 27 is an involute spline shaft, and a pump portion 80 which is attached by screwing long bolts 32 into a plurality (four in this example) of female screw holes 31 provided on the other side surface of the body portion 40. A plurality of (four in this example) female screw holes provided on the other surface of the body portion 40 while covering the connection pipe 60 connected to the suction port 24 via the filter member 33 and the pump portion 80. 34 and a cover body 70 which is attached by screwing a screw 36.

  An intermediate connector 37 that supplies power to the motor 28 is provided on the side of the motor 28.

  Since the body portion 40 is a base for mounting the motor 28 and connecting to the vehicle, it is desired that the body portion 40 be made of a metal having a large thickness and high rigidity, such as a casting. On the bottom surface of the body portion 40, a pair of fixing portions 41 attached to a vehicle-side bracket (FIG. 1, reference numeral 21) are provided so as to protrude downward. A shaft hole 42 into which the motor shaft 27 is inserted is provided at the center of the body portion 40.

  A side surface of the body portion 40 to which the pump portion 80 is attached is referred to as a pump attachment side surface 43. A seal material 44 such as an O-ring is provided on the pump mounting side surface 43 along the outer periphery of the pump mounting side surface 43.

  A semicircular intake groove 46 centered on the shaft hole 42 is provided on the pump mounting side surface 43 from the upper side to the lower side of the shaft hole 42, and a sealing material such as an O-ring surrounds the intake groove 46. 47 is provided on the pump mounting side surface 43.

  Furthermore, a plurality of (four chambers in the embodiment) chambers 51 to 54 are provided on the pump mounting side surface 43. The plurality of chambers 51 to 54 are disposed at the center in the vertical direction of the body portion 40, and are disposed between the first chamber 51 formed along the outer periphery of the body portion 40 and the first chamber 51 and the shaft hole 42. A second chamber 52 communicating with the first chamber 51 via the first communication groove 55, and a third chamber disposed below the shaft hole 42 and communicating with the second chamber 52 via the second communication groove 56. 53 and a fourth chamber 54 formed along the outer periphery of the body portion 40 immediately below the third chamber 53 and independent of the chambers 51 to 53.

  The connecting pipe 60 includes a fastening portion 63 that is fastened by screwing screws 62 into a plurality of (two in this example) female screw holes 61 provided on the upper surface of the body portion 40, and projects upward from the fastening portion 63. The main part 65 and the hose insertion part 66 extending from the base part 65 in the axial direction 67 of the motor shaft 27 are the main elements, and are connected to the suction port 24 through a single sealing material 68 such as an O-ring. .

  The cover body 70 is a bottomed cylinder, and includes a bottom portion 71 that faces the pump mounting side surface 43, a cylindrical portion 72 that extends from the bottom portion 71 toward the pump mounting side surface 43, and a bowl shape at the end of the cylindrical portion 72. The flange portion 73 is formed.

  3 is an exploded perspective view of the pump unit 80. The pump unit 80 includes a non-circular rotor chamber 81, a case 83 provided with a plurality (four in this example) of bolt holes 82, and a plurality of vane grooves 85. Are provided in a radial manner, and an involute spline hole 86 is provided in the center. , An intake plate 94 having a plurality (four in this example) of bolt holes 91 and two upper and lower intake holes 92, 93, and a plurality (four in this example) of bolt holes 96 and two upper and lower exhaust holes 97. , 98 and a plurality (four in this example) of bolts 32 passed through the bolt holes 96, 82, 91.

The configuration of each part of the negative pressure pump will be described in more detail with reference to FIGS.
FIG. 4 is a cross-sectional view of a main part of the negative pressure pump 10 assembled based on FIGS. 3 and 2.
As shown in FIG. 4, a rolling bearing 102 is provided in the shaft hole 42, and the motor shaft 27 is supported by the bearing 102. The tip of the motor shaft 27 is fitted into the involute spline hole 86 of the rotor 87, and the tip reaches the vicinity of the exhaust plate 101.

The flange portion 73 of the cover body 70 is in contact with the entire circumference of the sealing material 44, and the sealing material 44 ensures airtightness in the cover body 70.
On the other hand, the surface of the intake plate 94 is in contact with the entire circumference of the sealing material 47, and the opening of the intake groove 46 is blocked by the sealing material 47 and the intake plate 94, thereby forming the intake passage 103. As a result, an intake path including the connection pipe 60, the intake port 24, the intake passage 103, and two intake holes (FIG. 3, reference numerals 92 and 93) is formed.

An exhaust port 130 (described later in detail) is provided between the pair of fixing portions 41 and 41.
The third chamber 53 and the exhaust port 130 are communicated with each other by the first discharge passage 104. The first discharge passage 104 includes a lateral passage 106 that extends from the inner wall of the third chamber 53 toward the motor 28, and a longitudinal passage 107 that extends downward from the end of the lateral passage 106 and opens to the exhaust port 130. The 4th chamber 54 and the exhaust port 130 are connected by the 2nd discharge passage 108 extended in a perpendicular direction.

Next, the connecting portion structure 110 for attaching the connecting pipe 60 to the suction port 24 will be described with reference to FIG.
As shown in FIG. 5, the suction port 24 is formed with an opening 111 opening on the upper surface of the body portion 40 and an inner diameter smaller than the opening 111, and extends downward from the opening 111 via the step surface 112. And an intake passage portion 113.

  The filter member 33 is, for example, a saddle type filter, and has a flange portion 114 formed at an end portion on the connection pipe 60 side and supported by the step surface 112, and a plurality of rows extending downward from the flange portion 114 and arranged in the circumferential direction. The column portion 116 includes a bottom portion 117 that extends to the lower ends of the plurality of column portions 116, and a filter portion 119 that is inserted into a space surrounded by the bottom portion 117 and the column portion 116 and has a net portion 118. The flange portion 114, the column portion 116, and the bottom portion 117 can be formed as an integrally molded resin product. The filter member 33 can also be manufactured by an insert molding method in which a filter part 119 is placed in a mold and molten resin is poured around the filter part 119 during resin molding.

  The fastening portion 63 of the connection pipe 60 is provided with an insertion portion 121 that extends downward and is inserted into the suction port 24. The insertion portion 121 is provided with a filter entry portion 122 that extends downward and enters the filter member 33. .

  The filter entry portion 122 is formed with an outer diameter smaller than that of the insertion portion 121, and a restraining surface 123 is provided at a connection site (step surface) between the insertion portion 121 and the filter entry portion 122. The restraining surface 123 serves to restrain the flange portion 114 from above.

The sealing material 68 is disposed in a space surrounded by the fastening portion 63, the insertion portion 121, the opening portion 111, and the flange portion 114, and contacts the fastening portion 63, the insertion portion 121, the opening portion 111, and the flange portion 114.
That is, the sealing material 68 is in contact with the connection pipe 60, the suction port 24, and the filter member 33, and seals between the connection pipe 60 and the suction port 24 and seals between the filter member 33 and the suction port 24. To do.

Next, the configuration of the plurality of chambers will be described in detail with reference to FIGS.
As shown in FIG. 6, the chambers 51 to 54 and the communication grooves 55 and 56 each open to the pump part (FIG. 2, reference numeral 80) side.

  The first chamber 51 is formed in an arc shape centered on the motor shaft 27 and is formed in a belt shape with a width W1. The fourth chamber 54 has an outer shape surrounded by a straight line extending from side to side and an arc centered on the motor shaft 27. In the drawing, the maximum width (vertical direction) at the center of the fourth chamber 54 is indicated by W2, and the total length in the left-right direction is indicated by L1.

FIG. 7 is a view showing a configuration in which the pump unit 80 and the cover body 70 are attached to the structure of FIG.
As shown in FIG. 7, the opening of each of the second and third chambers (FIG. 6, reference numerals 52 and 53) and the first and second communication grooves (FIG. 6, reference numerals 55 and 56) is an intake plate 94. The whole is blocked.

  On the other hand, the first chamber 51 and the fourth chamber 54 formed along the outer periphery of the body part 40 are partially closed by the cover body 70 and the intake plate 94.

  Of the cylindrical portion 72 of the cover body 70, a portion facing the first chamber 51 is recessed so as to protrude toward the motor shaft 27, and the cylindrical portion of the opening of the first chamber 51 is formed at the recessed portion 124. Block the 72 side. The opening of the first chamber 51 closes the motor shaft 27 side with the intake plate 94.

  As a result, the first chamber 51 communicates with the inside of the cover body 70 through a gap having a width W3 that is significantly smaller than the width W1. The narrow gap with the width W3 becomes the exhaust passage 126. Exhaust air from the exhaust holes 97 and 98 flows from the inside of the cover body 70 through the exhaust passage 126 to the first chamber 51.

  Further, in the cylindrical portion 72 of the cover body 70, a portion facing the fourth chamber 54 is recessed so as to protrude toward the motor shaft 27, and the recessed portion 125 opens the lower portion of the fourth chamber 54. Block. Further, the upper opening of the fourth chamber 54 is closed with the intake plate 94.

  As a result, the fourth chamber 54 communicates with the inside of the cover body 70 by a gap having a width W4 that is much smaller than the width W2 and a left and right gap having a length L2 that is much smaller than the length L1. The narrow gap with the width W4 becomes the exhaust passage 127, and the left and right narrow gaps with the length L2 become the exhaust passages 128, 128. Exhaust air from the exhaust holes 97 and 98 flows from the inside of the cover body 70 to the fourth chamber 54 after being restricted by the exhaust passage 127 and the exhaust passages 128 and 128.

Next, the configuration of the exhaust port will be described with reference to FIGS.
FIG. 8 is a bottom view of the negative pressure pump 10, and female screw holes 23 and 23 into which bolts (FIG. 1 and 22) are screwed are provided in the fixing portions 41 and 41 of the body portion 40. The exhaust port 130 is provided between the fixing portions 41 and 41 (between the female screw holes 23 and 23) and is located at the lowest position in the negative pressure pump 10. The exhaust port 130 has a plug member 132 fitted into the exhaust hole 131 from the outside, and a plurality of exhaust passages 133 are formed between the inner peripheral surface of the exhaust hole 131 and the outer peripheral surface of the plug member 132.

  As shown in FIG. 9, the exhaust hole 131 is a hole having a circular cross section and a depth smaller than the diameter. An oval recess 136 is formed in the ceiling surface 134 of the exhaust hole 131. A plurality (four in this example) of lateral grooves 137 extend radially from the recess 136 to the inner peripheral surface of the exhaust hole 131. Further, the first discharge passage 104 and the second discharge passage 108 open in the recess 136. The inner diameter of the first discharge passage 104 is set larger than the inner diameter of the second discharge passage 108.

  A plurality of vertical grooves 139 are formed along the axial direction 138 of the exhaust hole 131 so as to communicate with the plurality of horizontal grooves 137 on the inner peripheral surface of the exhaust hole 131. In the embodiment, the cross section of the horizontal groove 137 is rectangular and the cross section of the vertical groove 139 is semicircular. However, the shape and number of the horizontal groove 137 and the vertical groove 139 correspond to the exhaust performance required for the negative pressure pump. Can be determined arbitrarily.

  The plug member 132 includes a disc portion 141 and a peripheral wall portion 142 formed on the outer periphery of the disc portion 141, and can be formed by, for example, pressing a steel plate. The outer diameter of the plug member 132 is set to be slightly larger than the inner diameter of the exhaust hole 131, and the plug member 132 is assembled into the body portion 40 by being press-fitted into the exhaust hole 131.

  As shown in FIG. 10, the plug member 132 is inserted into the exhaust hole 131 until it contacts the ceiling surface 134 and closes the exhaust hole 131. As a result, the disc portion 141 closes the concave portion (FIG. 9, reference numeral 136) and the plurality of lateral grooves (FIG. 9, reference numeral 137), and the space portion 143 having a complicated shape is formed.

  As shown in FIG. 11, the peripheral wall 142 closes the openings of the plurality of vertical grooves 139, so that a plurality of exhaust passages 133 aligned in the circumferential direction are formed on the outer periphery of the plug member 132. The plurality of exhaust passages 133 communicate the space portion 143 with the outside.

  Even if water is present in the cover body (FIG. 7, reference numeral 70), the exhaust passage (FIG. 7, 127, 128) and the fourth chamber (FIG. 7, reference numeral 54) at the lowest position Water can be guided to the exhaust port 130 and easily removed.

The operation of the negative pressure pump described above will be described next.
As shown in FIG. 12, when the motor (FIG. 2, reference numeral 28) operates, the outside air is sucked into the connection pipe 60 by the suction action of the pump unit 80. The intake air passes through the connection portion structure 110 and the filter member 33 and is sucked into the suction port 24 (arrow (1)).

  The intake air that has entered the intake port 24 enters the pump unit 80 through the intake hole 92 and is pressurized and discharged from the exhaust hole 97 (arrow (2)), or is pumped from the intake hole 93 through the intake passage 103. Part 80 is pressurized and discharged from the exhaust hole 98 (arrow (3)). Exhaust gas discharged from the upper and lower exhaust holes 97 and 98 flows into the cover body 70.

  As shown in FIG. 13, in the cover body 70, the exhaust is guided to the exhaust port 130 through one of the two exhaust paths. In one path, the exhaust gas flows through the gap between the side portion of the pump unit 80 and the cover body 70, and then flows into the first chamber 51 through the exhaust passage (reference numeral 126 in FIG. 7) (arrow (4) ), (5)). The exhaust gas flowing into the first chamber 51 moves to the second chamber 52 through the first communication groove 55 (arrow (6)). The exhaust gas flowing into the second chamber 52 moves to the third chamber 53 via the second communication groove 56 (arrow (7)). When the exhaust gas flowing into the third chamber 53 reaches the plug member 132 through the first discharge passage 104, the exhaust passes through the space 143 so as to avoid the plug member 132, and is discharged into the atmosphere from the exhaust passage 133. (Arrow (8)).

  In the other exhaust path, the exhaust flows through the gap between the lower surface of the pump unit 80 and the cover body 70 (arrow (9)), and flows into the fourth chamber 54 via the exhaust passage 127 or the exhaust passage 128 (arrow). (10)). When the exhaust gas flowing into the fourth chamber 54 reaches the plug member 132 through the second discharge passage 108, it passes through the space 143 so as to avoid the plug member 132, and is discharged into the atmosphere from the exhaust passage 133. Arrow (11)).

According to the negative pressure pump acting as described above, the following effects can be obtained.
As shown in FIG. 5, in the connection portion structure 110, the single sealant 68 seals between the insertion portion 121 and the suction port 24 and seals between the filter member 33 and the suction port 24.

  As a result, even if the outside air flows into the gap 144 between the connecting pipe 60 and the body portion 40 as indicated by the arrow (12), there is no concern that the outside air enters the suction port 24 due to the sealing material 68. Further, even if the intake air flows into the gap 146 between the filter member 33 and the connection pipe 60 as indicated by the arrow (13), the intake material may flow into the gap 147 between the filter member 33 and the suction port 24 due to the sealing material 68. Nor. Therefore, only one sealing material is required, and the number of sealing materials can be reduced.

  Further, by restraining the flange portion 114 with the restraining surface 123, the movement of the filter member 33 in the axial direction can be restricted, the filter member 33 can be positioned, and the vibration of the filter member 33 when negative pressure occurs is suppressed. can do. That is, the connecting pipe 60 also serves as a stopper that restricts the movement of the filter member 33. As a result, the space for the suction port 24 can be saved by the amount that the stopper is unnecessary.

  Furthermore, since there are a plurality of chambers (reference numerals 51 to 54) corresponding to the expansion chamber, the total volume of the expansion chamber can be increased. As a result, exhaust noise can be further reduced.

  In addition, as shown in FIG. 14, the exhaust gas is expanded in the first chamber 51, the expanded exhaust gas is throttled in the first communication groove 55, and then expanded in the second chamber 52. The expanded exhaust is again throttled by the second communication groove 56 and expanded by the third chamber 53. As described above, the exhaust gas can be expanded stepwise, so that the exhaust noise can be further reduced.

  The first chamber 51 and the fourth chamber (FIG. 7, reference numeral 54) are formed by overlapping the cover body (FIG. 7, reference numeral 70) on the body portion 40. Since it is only necessary to form a recess in the body portion 40, the chamber is easily formed.

As a means for closing a part of the opening of the chamber, it is conceivable to newly procure a dedicated part such as a plate. However, when a dedicated part is procured, the number of parts increases and the product cost increases.
In this regard, in the present embodiment, a part of the opening of each of the first chamber 51 and the fourth chamber (FIG. 7, reference numeral 54) is blocked by the recessed portion (FIG. 7, reference numerals 124 and 125) of the cover body. As a result, no special parts are required. As a result, the product cost can be suppressed.

  Further, since the plurality of chambers and the plurality of communication grooves are covered with the intake plate (FIG. 7, reference numeral 94), no dedicated parts are required. That is, an increase in the number of components can be suppressed by using the intake plate also as a component that covers the chamber and the communication groove.

  Further, since the exhaust gas flows through the gap between the pump part (FIG. 7, reference numeral 80) and the cover body (FIG. 7, reference numeral 70) and goes to the exhaust passage (FIG. 7, reference numerals 126 to 128), the exhaust gas is exhausted from the exhaust hole. There is no need to process a dedicated passage for guiding the exhaust to the passage in the pump section or the like. As a result, the processing cost of parts can be suppressed.

  Further, as shown in FIG. 11, the exhaust path at the exhaust port 130 is a labyrinth formed of the first exhaust passage 104, the second exhaust passage 108, a complex-shaped space portion 143, and a plurality of exhaust passages 133. By this complicated maze, even if water enters from the outlet of the exhaust passage 133 as shown by the arrow (14), it is possible to prevent water from flowing back to the upstream side (pump side) from the plug member 132. it can. Therefore, even when the motor is stopped (when the negative pressure pump is stopped), it is possible to prevent water from entering from the exhaust port 130 into the pump unit (FIG. 4, reference numeral 80). As a result, the function and durability of the negative pressure pump can be maintained.

  Further, since it is easy to process the exhaust hole 131 and the plug member 132, a desired exhaust passage 133 can be easily formed. That is, the exhaust port 130 having a desired structure can be easily manufactured at low cost.

  Further, when the exhaust hole 131 is formed by casting, the longitudinal groove 139 can be simultaneously formed. As a result, the processing cost of the longitudinal groove 139 can be suppressed. On the other hand, since the outer peripheral surface of the plug member 132 without a longitudinal groove may be flat, the processing cost of the plug member 132 can also be suppressed.

  In addition, although the connection part structure of this invention is suitable for the connection part structure which attaches a connection pipe to the suction port provided in a negative pressure pump, the connection which attaches a connection pipe to a to-be-attached member through a filter member so that removal is possible If it is a partial structure, the use is arbitrary.

  The connection part structure of the present invention is suitable for a connection part structure in which a connection pipe is attached to a suction port provided in a negative pressure pump.

  DESCRIPTION OF SYMBOLS 10 ... Negative pressure pump, 24 ... Suction port (port), 33 ... Filter member, 60 ... Connection pipe, 68 ... Sealing material, 110 ... Connection part structure, 114 ... Gutter part, 121 ... Insertion part, 122 ... Filter entrance part , 123 ... a restraining surface.

Claims (3)

In the connection portion structure in which the connecting pipe is detachably attached to the pipe mounting member,
A filter member to be inserted into a port provided in the tube mounting member;
An insertion portion provided in the connection pipe and inserted into the port;
A filter entry portion extending from the insertion portion and entering the filter member;
A single sealing material that contacts the insertion portion, the port, and the filter member, seals between the insertion portion and the port, and seals between the filter member and the port. Connection part structure. In the connection part structure of Claim 1,
The filter member includes a flange at the end on the connection pipe side,
The connection pipe structure includes a holding surface that suppresses the flange portion at a connection portion between the insertion portion and the filter entry portion. In the connection part structure of Claim 1 or Claim 2,
The pipe-attached member is a negative pressure pump,
The connection part structure, wherein the port is an intake port of the negative pressure pump.

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