JP2007224967A - Passage throttling member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttling member which is inserted into a fluid passage in order to prevent the generation of cavitation, and is excellent in its workability and assemblability. <P>SOLUTION: The cylindrical thick-walled portion 12 of the passage throttling member 10 having the outer wall 11 slightly smaller than the inside diameter of a pipe is inserted into the exit side opening end portion 4b of the outlet port side heater pipe 4 of a heater core for flowing warm water, the outlet port side heater pipe 4 being the portion where the cavitation of the heater core is easily generated, and both of them are loosely fitted. The diameter of the inner wall 13 of the cylindrical thick-walled portion is formed so as to prevent the cavitation. A bulge portion 15 having an expanded inside diameter is provided at the exit side opening end portion of the pipe. A projecting portion 14 formed on the end portion of the cylindrical thick-walled portion is engaged with the bulge portion so as to prevent an axial movement. In this case, the mounted state of the passage restricting member can be easily inspected by eyes. The outlet port side heater pipe is inserted and fixed in a heater hose 6 for connecting the outlet port side heater pipe to a pump. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flow path restricting member.

  Conventionally, for example, in a heat exchanger with a water valve (heater core) arranged in a hot water circuit used in a vehicle air conditioner, a low pressure portion is caused by a pressure difference (differential pressure) before and after the valve at a high flow rate. Therefore, a phenomenon in which bubbles are generated with abnormal noise from hot water, so-called cavitation occurs.

The occurrence of such cavitation not only causes a decrease in heat exchange efficiency in the heater core, but also has a problem that the generated abnormal noise causes discomfort to passengers in the vehicle interior. In order to prevent this cavitation, a collar member having an inner diameter smaller than the inner diameter of the heater hose is attached to the heater hose connecting the outlet side of the heater core and the pump for circulating hot water, that is, the throttle is attached to the heater hose. In which the pressure drop is suppressed, that is, the differential pressure is reduced to prevent the occurrence of cavitation (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 9-207539

  However, in the above prior art, since the collar member is a simple cylindrical member, it is necessary to prevent the collar member from being moved by the hot water flow in the heater hose. However, the insertability for arranging in such a state is poor. There's a problem. In addition, due to restrictions on the arrangement of the hot water circuit device, when the straight dimension of the heater hose cannot be obtained, the collar member must be inserted beyond the bending curvature of the heater hose, which is difficult to insert. . In addition, it is troublesome to visually inspect whether the collar member is normally arranged at the bent portion of the hose.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a throttle member that is inserted in order to prevent the occurrence of cavitation in a liquid flow passage and has good workability and assembly.

  In order to achieve the above object, the present invention provides a fluid throttle member (10, 20, 30) disposed on the downstream side of a portion that forms a differential pressure in a liquid flow passage, and includes a cylindrical inner wall (13, 33). ) And a cylindrical outer wall (11, 31) having a diameter larger than that of the inner wall of the cylinder, and an open end (4a) of the pipe (4) constituting the liquid flow passage. 4b), the cylindrical outer wall (11, 31) of the cylindrical thick part (12, 32) is inserted and arranged so as to fit into the inner wall of the pipe (4).

  Thereby, the flow path restricting member (10, 20, 30) can be easily inserted into the pipe (4) from the open end portions (4a, 4b) of the pipe (4). In addition, a protruding portion (14, 23, 34) is formed on one end of the cylindrical thick portion (12, 32) in the cylindrical axial direction so as to protrude radially outward from the cylindrical outer wall (11, 31), By disposing the protrusions so as to engage with the open ends (4a, 4b) of the pipe (4), the channel restricting members (10, 20, 30) can be securely locked to the pipe (4). Can do. Furthermore, the bulge part (15, 43) with the expanded inner diameter is provided at the opening end part (4a, 4b) of the pipe, and the protrusion part (14, 23, 34) of the cylindrical thick part (12, 32) is bulged. It can arrange | position so that it may engage with a part (15, 43).

  If it is the downstream side of the part where the differential pressure is formed, that is, the part where cavitation may occur, the inflow part which is the liquid flow inflow side of the pipe (4) is connected to the flow restrictor (10, 20, 30). Either the opening (4a) or the outflow portion opening (4b) on the liquid flow outflow side may be disposed.

  Further, one end of the cylindrical shaft of the cylindrical thick part (12) has a diameter larger than the diameter of the cylindrical outer wall (11), and a plurality of parts separated in the circumferential direction via the slit part (22). By forming the expanded portion (21), the expanded portion (21) presses the inner wall of the pipe (4) as a spring member, so that the flow path restricting member (20) is securely engaged with the pipe (4). Can be stopped.

  Alternatively, one end portion of the cylindrical shaft of the cylindrical thick portion (32) has an insertion portion (35) inserted into the inner wall of another pipe (40) connected to the pipe (4) along the cylindrical axis. A projection (34) having a diameter larger than the diameter of the cylindrical outer wall (31) of the cylindrical thick part (32) is provided between the cylindrical thick part (32) and the insertion part (35). The part (34) can be arranged in the fluid flow passage so as to be sandwiched between the ends of the pipe (4) and the other pipe (40).

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a hot water circuit in which the flow path restricting member of this embodiment is used. This hot water circuit circulates engine cooling water (hot water) between the engine 8 and the heater core 1 which is a heat exchanger for heating.

  Hot water from the engine 8 is guided to the heater core inlet 1 a by the inlet side heater hose 5 and the inlet side heater pipe 3 connected to the inlet side heater hose 5, and passes through the heater core 1. The hot water in the heater core 1 is sucked by the suction pump 7 from the heater core outlet 1b through the outlet side heater pipe 4 and the outlet side heater hose 6 connected to the outlet side heater pipe 4, and returned to the engine 8.

  The heater core 1 is provided with a water valve 2 for adjusting the flow rate of hot water flowing into the heater core 1 from the heater core inlet 1a. The water valve 2 in this embodiment includes a flow rate controller 2a as a valve. The flow controller 2a includes an inlet-side inlet passage 2b, an outlet-side main passage 2c, and a bypass passage 2d. The inlet passage 2b is connected to the inlet side heater pipe 3, and the main passage 2c is connected to the heater core inlet 1a. The bypass passage 2d is connected in the middle of the outlet passage 2e that connects the heater core outlet 1b and the outlet-side heater pipe 4.

  The flow rate controller 2a is controlled by a control signal from a control ECU (not shown) so that the rotational position of a small hole for flow rate adjustment (not shown) is controlled to the main passage 1a side or the bypass passage 2d side. The flow rate of the air flow is adjusted to a flow rate ratio of 100% (at Max Hot) to 0% (at Max Cool).

  Here, the liquid flow state during Max Cool will be described. At Max Cool, the flow rate to the main passage 2c is 0% and the flow rate to the bypass passage 2d is 100%. When the rotational speed of the engine 8 is high, the rotational speed of the pump 7 is also high, and therefore the flow rate of liquid flowing through the heater pipes 3 and 4 is also high. At this time, the liquid flow flowing into the bypass passage 2d from the flow rate controller 2a is throttled by a small hole in the flow rate controller 2a, and the pressure is greatly reduced. The pressure difference with the bypass passage 2d increases, and cavitation occurs in the bypass passage 2d. FIG. 1 schematically shows a bubble 2f generated by cavitation in the bypass passage 2d.

  In order to prevent the occurrence of such cavitation, in the first embodiment, a flow path restricting member 10 is used as shown in FIG. 2A is a cross-sectional view of the flow path restricting member 10 of the first embodiment, FIG. 2B is a view taken in the direction of arrow A in FIG. 2A, and FIG. 2C is a flow path throttle at the outlet opening 4b of the outlet side heater pipe. It is sectional drawing which shows the state in which the member 10 is mounted | worn.

  The flow path restricting member 10 includes a cylindrical thick portion 12 formed of ethylene propylene rubber (EPDM). The diameter of the cylindrical outer wall 11 of the cylindrical thick portion 12 is set slightly smaller than the inner diameter of the heater pipe 4 to be fitted. The diameter of the cylindrical inner wall 13 of the cylindrical thick portion 12 is set smaller than the diameter of the cylindrical outer wall 11. The square of the ratio between the outer wall diameter and the inner wall diameter is the ratio between the pipe area of the heater pipe 4 and the pipe area of the cylindrical thick portion 12. This ratio is determined in advance by appropriately calculating the throttle area necessary for preventing cavitation according to the maximum flow rate flowing through the water valve 2.

  At one end portion of the cylindrical shaft of the cylindrical thick portion 12, a protruding portion 14 formed in a convex shape radially outward from the cylindrical outer wall 11 is provided in the circumferential direction. The other end of the cylindrical thick portion 12 is inserted from the outflow portion opening 4b of the outlet side heater pipe 4 to the left side in FIG. At this time, since the diameter of the cylindrical outer wall 11 of the cylindrical thick portion 12 is smaller than the inner diameter of the heater pipe 4, the flow restrictor 10 is easily inserted into the heater pipe 4 and can be loosely fitted.

  On the other hand, a bulge portion 15 having an enlarged inner diameter is provided at the outflow portion opening end portion 4 b of the outlet side heater pipe 4. When the projection 14 of the flow passage restricting member 10 engages with the bulge portion, the position of the flow restricting member 10 fitted in the heater pipe 4 is fixed, and the liquid flow in the heater pipe 4 (in the drawing) Movement in the pipe due to (indicated by arrows) is prevented.

  Further, the outlet side heater pipe 4 into which the flow path restricting member 10 is inserted is press-fitted into the outlet side heater hose 6, and the outer periphery of the outlet side heater hose 6 is fixed by a fixture (not shown) such as a clip. Therefore, the positioning and fixing of the flow path restricting member 10 in the outlet side heater pipe 4 is more reliable.

  In this manner, the flow path restricting member 10 having the cylindrical thick portion 12 is moved into the heater pipe 4 from the outlet opening end 4b of the outlet side heater pipe 4 on the downstream side of the water valve 2 where a large differential pressure is generated. Therefore, the pressure drop in the water valve 2 can be suppressed, that is, the differential pressure before and after the valve can be reduced, and the occurrence of cavitation can be prevented.

  In addition, it is easy to insert the flow restricting member 10 into the outlet side heater pipe 4, and it is easy to visually check that the protrusion 14 is engaged with the bulge 15 in the confirmation work after the insertion. can do.

(Second Embodiment)
A flow path restricting member according to a second embodiment of the present invention will be described with reference to FIG. 3A is a cross-sectional view of the flow path restricting member 20 of the second embodiment, FIG. 3B is a view taken in the direction of arrow A in FIG. 3A, and FIG. 3C is a flow path throttle at the outflow opening 4b of the outlet side heater pipe. It is sectional drawing which shows the state in which the member 20 is mounted | worn.

  The second embodiment is also the same in that the flow path restricting member 20 is mounted on the outlet opening end 4b of the outlet side heater pipe 4 similar to the first embodiment. Hereinafter, the same components are denoted by the same reference numerals and description thereof is omitted.

  The flow path restricting member 20 of the second embodiment is made of a nylon (NY) material, and includes a cylindrical thick portion 12 and an expanded portion 21. As in the first embodiment, the cylindrical thick portion 12 is formed such that the diameter of the cylindrical outer wall 11 is slightly smaller than the inner diameter of the outlet side heater pipe 4, and the diameter of the cylindrical inner wall 13 is necessary for preventing cavitation. It is set to such an extent that a diaphragm in the thick part 12 can be formed.

  A plurality of widened portions 21 are provided in the circumferential direction through a plurality of slit portions 22 formed in the cylindrical axis direction from the protruding portions 23 formed in the circumferential direction at the end portion of the cylindrical thick portion 12 in the cylindrical axis direction. It is the made leaf spring member. The outer peripheral diameter of the expanded portion 21 is formed so as to gradually increase from the diameter of the cylindrical outer wall 11 of the cylindrical thick portion 12 in the cylindrical axial direction. As a result, the expanding portion 21 generates a radially outward elastic force at the position of the protruding portion 23.

  When the flow path restricting member 20 of the second embodiment is mounted in the outlet side heater pipe 4, the cylindrical outer wall 11 of the cylindrical thick portion 12 is first loosely fitted into the heater pipe 4 from the outflow portion opening end 4b. Further, the channel restricting member 20 is pushed into the heater pipe 4 while the expanding portion 21 is bent inward in the radial direction. Thereafter, the protrusion 23 is fixed to the bulge 15 by the spring force of the widened portion 23 by engaging the protrusion 23 with the bulge 15 of the outflow opening end 4b. Thereby, also in 2nd Embodiment, the effect similar to 1st Embodiment can be acquired.

(Third embodiment)
Next, the flow path restricting member of the third embodiment will be described with reference to FIG. 4A is a cross-sectional view of the flow path restricting member 30 of the third embodiment, FIG. 4B is a view taken in the direction of arrow A in FIG. 4A, and FIG. It is sectional drawing which shows the state in which the aperture member 30 is mounted | worn. In FIG. 4C as well, the flow direction in the channel pipe is from the left to the right as shown by the arrows.

  The flow path restricting member 30 of the third embodiment is made of a nylon material and includes a cylindrical thick part 32, a protruding part 34, and an insertion part 35. As in the first and second embodiments, the cylindrical thick portion 32 is formed such that the diameter of the cylindrical outer wall 31 is slightly smaller than the inner diameter of the outlet side heater pipe 4, and the diameter of the cylindrical inner wall 33 prevents cavitation. It is set to such an extent that a diaphragm can be formed in the necessary cylindrical thick part 32.

  Furthermore, in the flow path restricting member 30 of the third embodiment, an insertion portion 35 is formed on the opposite side of the cylindrical thick portion 32 to the cylindrical axis direction with respect to the projection portion 34. The insertion part 35 forms a pipe line 36 coaxial with the cylindrical thick part 32, and the diameter of the outer peripheral part is larger than the inner diameter of the heater core outlet side pipe 40 connected to the inlet side opening end part 4a of the outlet side heater pipe 4. It is formed to be slightly smaller. In addition, the pipe line 36 of the insertion part 35 is formed so that an internal diameter becomes large as the end part of the flow-path throttle member 30 is approached.

  The flow path restricting member 30 of the third embodiment is attached to the heater core outlet side pipe 40 on the downstream side of the bypass passage 2d where cavitation may occur in the outlet passage 2e of the heater core 1. One end (not shown) of the heater core outlet side pipe 40 is brazed to the heater core 1 as its outlet side pipe line, and a flange portion 42 is provided at a predetermined distance from the opening 41 at the other end. Yes.

  An inflow portion opening end portion 4a of the outlet side heater pipe 4, which is a connection partner of the heater core outlet side pipe 40, has a two-stage bulge portion 43 having an inner diameter widened in two stages, and a flange portion 44 at its outermost end portion. Is formed.

  The mounting of the flow path restricting member 30 of the third embodiment into the pipeline is performed as follows. First, the insertion portion 35 of the flow path restricting member 30 is inserted into the heater core outlet side pipe 40. In this state, the cylindrical outer wall 31 of the cylindrical thick portion 32 exposed from the opening 41 of the heater core outlet side pipe 40 and the inlet portion opening end 4a of the outlet side heater pipe 4 are loosely fitted.

  Thus, when the cylindrical outer wall 31 is inserted into the heater pipe 4, the protrusion 34 provided at substantially the center of the flow path throttle member 30 is formed by the opening 41 of the heater core outlet side pipe 40 and the inflow portion of the outlet side heater pipe 4. The position with respect to both the pipes 4 and 40 is fixed by being sandwiched between the two-stage bulge portions 43 provided at the open end 4a. At this time, the flange portions 42 and 44 are in contact with each other, and the flange portions 42 and 44 are fixed by a fixture (not shown) so as not to move in the axial direction.

  As described above, the flow path restricting member 30 of the third embodiment can be easily mounted and visually inspected even at the connection portion between pipes.

(Other embodiments)
(1) In the first and second embodiments described above, the bulge portion 15 is provided at the outflow portion opening end portion 4b of the outlet side heater pipe 4, and the bulge portion 15 and the protrusions provided in the flow passage restricting portions 10 and 20 are provided. 14, the flow restrictors 10 and 20 are prevented from moving in the axial direction. However, the present invention is not limited to this, and the opening end 4 b directly contacts the protrusion 14 in the cylindrical axial direction. The movement of the members 10 and 20 may be suppressed. In this case, it is not necessary to provide the bulge portion 15 on the outlet side heater pipe 4.

  (2) In the first and second embodiments, the flow restrictors 10 and 20 are arranged at the outflow opening end 4b of the outlet side heater pipe 4, but the inflow opening end 4a Even if it arrange | positions, generation | occurrence | production of the cavitation in the upstream can be prevented.

  Similarly, in the third embodiment, the flow restricting member 30 is disposed at the inflow portion opening end 4a of the outlet side heater pipe 4, but may be disposed at the outflow side opening end 4b. .

It is a figure which shows the warm water circuit where the flow-path throttle member of this embodiment is used. (A) is a side view of the flow path restricting member of the first embodiment, (b) is a view taken in the direction of arrow A in (a), and (c) is a flow path restricting member attached to the outlet portion opening of the outlet side heater pipe. FIG. (A) is a side view of the flow path restricting member of the second embodiment, (b) is a view taken in the direction of arrow A in (a), and (c) is a flow restrictor attached to the outlet portion opening of the outlet side heater pipe. FIG. (A) is a side view of the flow path restricting member of the third embodiment, (b) is a view taken in the direction of arrow A in (a), and (c) is a flow restrictor attached to the inlet opening of the outlet side heater pipe. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heater core, 2 ... Water valve, 2a ... Flow rate controller, 2c ... Main passage,
2d ... Bypass passage, 4 ... Outlet side heater pipe, 4a ... Inlet opening end,
4b ... Outlet opening end, 6 ... Outlet heater hose, 7 ... Pump,
10, 20, 30 ... channel restricting member, 12, 32 ... cylindrical thick part, 11,31 ... cylindrical outer wall,
14, 23, 34 ... projection, 15, 43 ... bulge part, 21 ... widening part, 22 ... slit,
35 ... Insertion part.

Claims (9)

A fluid throttle member (10, 20, 30) disposed downstream of a portion forming a differential pressure in the liquid flow passage,
A pipe (12, 32) comprising a cylindrical inner wall (13, 33) and a cylindrical thick wall (12, 32) having a cylindrical outer wall (11, 31) having a diameter larger than the diameter of the cylindrical inner wall, and constituting the liquid flow passage ( It is inserted and arranged so that the cylindrical outer wall (11, 31) of the cylindrical thick part (12, 32) is fitted to the inner wall of the pipe (4) from the opening end (4a, 4b) of 4). A flow path restricting member. A projection (14, 23, 34) is provided on one end of the cylindrical thick portion (12, 32) in the cylindrical axis direction so as to protrude outward in the radial direction from the cylindrical outer wall (11, 31). 2. The flow restricting member according to claim 1, wherein the protrusions (14, 23, 34) are arranged to engage with the open ends (4 a, 4 b) of the pipe (4). Bulge portions (15, 43) having an enlarged inner diameter are formed at the open ends (4a, 4b) of the pipe (4), and the protrusions (14, 23, 34) are formed in the bulge portions (15, 43). The flow passage restricting member according to claim 2, wherein the flow path restricting member is disposed so as to be engaged with the first flow passage. The cylindrical thick part (12, 32) is fitted to the outflow part opening (4b) which is the liquid outflow side of the pipe (4) on the downstream side of the part forming the differential pressure. The flow path restricting member according to any one of claims 1 to 3. The cylindrical thick part (12, 32) is fitted to an inflow part opening (4a) which is a liquid inflow side of the pipe (4) on the downstream side of the part forming the differential pressure. The flow path restricting member according to any one of claims 1 to 3. One end portion of the cylindrical shaft of the cylindrical thick portion (12) has a diameter larger than the diameter of the cylindrical outer wall (11), and a plurality of expansions separated in the circumferential direction via the slit portion (22). 6. The flow path restricting member according to claim 1, wherein an opening (21) is formed. One end of the cylindrical shaft of the cylindrical thick portion (32) has an insertion portion (35) inserted into the inner wall of another pipe (40) connected to the pipe (4) on the cylindrical shaft. And a projection (34) having a diameter larger than the diameter of the cylindrical outer wall (31) of the cylindrical thick part (32) between the cylindrical thick part (32) and the insertion part (35). Is provided,
The said protrusion (34) is arrange | positioned in the said fluid flow path so that it may be pinched | interposed by each edge part of the said pipe (4) and the said other pipe (40), The 1 thru | or 5 characterized by the above-mentioned. The channel restricting member according to any one of the above. In the fluid flow passage, a heat exchanger (1) through which engine cooling water flows and a pump (7) for sucking the engine cooling water at the cooling water outlet side (1b) of the heat exchanger (1) The cylindrical thick part (12, 32) is disposed in the outlet side heater pipe (4) between the cooling water outlet side (1b) of the heat exchanger (1) and the pump (7). The flow path restricting member according to claim 1, wherein the flow path restricting member is arranged in a vertical direction. The liquid flow passage connected to the heat exchanger (1) includes a main passage (2c) flowing into the cooling water inlet (1a) and the outlet side heater pipe (not flowing into the cooling water inlet (1a)). 4) provided with a water valve (2) for switching the flow path with the bypass passage (2d) directly connected to
The flow path restricting member according to claim 8, wherein the cylindrical thick part (12, 32) is disposed in the outlet side heater pipe (4) on the downstream side of the bypass passage (2d). .

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