JPH0429053Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a resin cap for a heat exchanger used in a heat exchanger such as a radiator.

[Conventional technology]

Generally, a heat exchanger such as a radiator is fitted with a metal heat exchanger cap as disclosed in, for example, Japanese Utility Model Application No. 61-134526.

FIG. 14 shows this type of cap for a heat exchanger. A retainer 9 and a valve support 11 are fixed to each other, and a pressure spring 13 is attached to the valve support 11 when the internal pressure of the radiator exceeds a set pressure.
A pressurizing valve 15 is installed concentrically with the pressurizing valve 15 to open the cooling water flow path and flow out the cooling water to a reserve tank (not shown) against the pressure, and when the cooling system becomes under negative pressure. The structure includes a negative pressure valve 19 that opens a cooling water flow path against a negative pressure spring 17 and causes the cooling water in the reserve tank to flow back into the heat exchanger. In addition, in the figure, 5a is a valve seat of filler neck 5, and 15a is an elastic packing of pressurizing valve 15.

Furthermore, Japanese Patent Application Laid-Open No. 51-5423 discloses a cap for a heat exchanger that is partially made of resin to reduce the number of parts.

[Problem that the invention attempts to solve]

However, the former heat exchanger cap shown in FIG. 14 has a large number of parts and is troublesome to assemble. Further, since the torque of the cap body 1 acts on the elastic packing 15a, permanent distortion occurs in the pressure contact portion with the valve seat 5a due to long-term use, causing a decline in function. Although the latter heat exchanger cap had fewer parts than the former heat exchanger cap, it still had problems such as permanent deformation of the elastic packing.

[Purpose of invention]

This invention was devised in view of the actual situation,
It is an object of the present invention to provide a resin cap for a heat exchanger in which many of the parts constituting the cap are molded from resin and in which permanent distortion of the elastic packing as described above is prevented.

[Means for solving problems]

In order to achieve such an object, the resin cap for a heat exchanger according to the present invention includes a lid body that is locked to the fillet neck of the heat exchanger and has a sealing member attached to the back side of the lid body to ensure airtightness with the fillet neck; The valve case is equipped with a valve case that is attached to the lid body and presses against the valve seat of the filler neck, and a pressurization/pressure valve mechanism that is inserted into the valve case. A cylindrical engagement protrusion that engages with the valve seat, and a small-diameter cylindrical protrusion that is connected to the engagement protrusion via an annular shoulder that presses against the valve seat of the fillet neck, and a seal member that is fitted onto the fillet neck to ensure airtightness with the fillet neck. The pressurization and depressurization valve mechanism consists of a valve mounting part and an elastic packing, and the valve mounting part has a negative pressure vent provided in the center, a packing mounting hole provided around it, and a lid. The elastic packing is configured to be pressed against the annular shoulder of the valve case by a pressurizing spring interposed between the elastic packing and the elastic packing. It has a movable tongue piece that forms a letter-shaped notch and a plurality of rod-shaped mounting stays formed on the edge, and the plurality of rod-shaped mounting stays are attached to the gasket mounting hole from the back side of the valve mounting part. It is configured so that it can be attached to the valve mounting part by fitting the stay part, and when the cooling system is pressurized or under normal conditions, the tongue of the elastic packing is brought into contact with the valve mounting part to open the negative pressure vent. When the cooling system is closed and there is negative pressure in the cooling system, the tongue piece of the elastic packing is bent to open the negative pressure vent.

[Effect of invention]

In this invention, the valve case contacts the valve seat of the filler neck, and the pressurization/depressurization valve mechanism contacts the tongue piece of the elastic packing against the valve mounting part within the valve case when pressurizing the cooling system and during normal operation. close the negative pressure vent,
When there is negative pressure in the cooling system, the tongue piece of the elastic packing bends to open the negative pressure vent, thereby opening and closing the cooling water passage.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a central longitudinal end view of a resin cap A for a heat exchanger according to an embodiment of the present invention. A cylindrical holding protrusion 25 and a cylindrical spring mounting protrusion (hereinafter referred to as "attachment protrusion") 29 into which the upper end of the pressure spring 27 fits are integrally provided on the back surface of the spring. An O-ring 31 is fitted onto the holding protrusion 25 to ensure airtightness with the upper end of the filler neck 23, and a cylindrical engagement protrusion 33 engages with the holding protrusion 25 to secure the valve case 35. It has a structure connected to the lid body 21. 2 is a plan view of the lid body 21, and FIG. 3 is a sectional view taken along the line -- in FIG.

As shown in FIG. 6, the valve case 35 includes a cylindrical engagement protrusion 33 that engages with the holding protrusion 25, and a small-diameter cylindrical protrusion 39 into which an O-ring 37 is fitted to ensure airtightness with the filler neck 23. are connected to each other via an annular shoulder portion 41. Incidentally, an annular groove 33 is formed on the inner periphery of the tip of the engagement protrusion 33, with which the protrusion 25a provided on the outer periphery of the tip of the holding protrusion 25 engages.
a is formed, and the protruding piece 25a is an annular groove 33.
By engaging with a, the valve case 35 is prevented from easily coming off from the lid body 21. or,
The holding protrusion 25 provided on the lid body 21, the engaging protrusion 33 and the cylindrical protrusion 39 of the valve case 35 are connected to the fourth
As shown in FIG. 5, FIG. 7, and FIG.
9a, and the cut 33b functions as a cooling water flow path as described later. Further, the tip of the cylindrical projection 39 is formed to expand outward to prevent the O-ring 37 from falling off.

Reference numeral 42 denotes a pressurization and depressurization valve mechanism mounted within the valve case 35.

Reference numeral 43 denotes a valve mounting portion pressed against the annular shoulder portion 41 by a pressure spring 27 interposed between the lid body 21 and the valve mounting portion 43. As shown in FIG. 8, a cylindrical spring mounting projection (hereinafter referred to as "mounting projection") 45 is formed into which the lower end of the pressure spring 27 fits, and a negative pressure vent hole 47 is formed as shown in FIG. Provided within the mounting protrusion 45, and the mounting protrusion 45
A plurality of gasket attachment holes 49 are formed around the periphery. A rod-shaped mounting stay portion 51 is fitted into a packing mounting hole 49 to attach an elastic packing 53 to the valve mounting portion 43, and this elastic packing 53 connects the valve mounting portion 43 and the lid body. 21
The pressure spring 27 interposed between the annular shoulder 41 closes the cooling water flow path between the heat exchanger (not shown) and the reserve tank (not shown), and the cooling system The valve mounting part 4 becomes pressurized.
3 is separated from the annular shoulder portion 41 against the spring force of the pressurizing spring 27, it functions to open the cooling water flow path. As shown in FIG. 9, an annular convex portion 4 is provided on the back surface of the valve mounting portion 43 to prevent the elastic packing 53 from shifting when it is attached.
3a are integrally formed, and an elastic packing 53
When attaching to the valve mounting portion 43, the annular protrusion 43a is fitted into an annular protrusion 53a provided on the outer periphery of the elastic packing 53 to prevent the elastic packing 53 from shifting.

Furthermore, as shown in FIG. 10, this elastic packing 53 is provided with a C-shaped notch 56 in its center to form a tongue piece 57 having a protrusion 55 having an arcuate cross section. , the protrusion 55 comes into contact with the negative pressure vent hole 47 of the valve mounting portion 43. When the cooling system is pressurized, the pressing force of pressurized air acts on the tongue piece 57, causing the protrusion 55 to close the cooling water flow path of the negative pressure vent hole 47, and when the cooling system is in a negative pressure state. is the tongue piece 5 as shown in Figure 13.
7 is bent in the direction of arrow B to open the cooling water flow path of the negative pressure vent 47.

In addition, in FIG. 2, reference numeral 59 denotes a locking pawl integrally formed on the lid body 21, and after the locking pawl 59 is inserted into a notch (not shown) provided in the lip portion 23a of the filler neck 23. , attach the lid body 21 to the filler neck 23
The resin cap A for the heat exchanger is secured to the fillet neck 23 by rotating while being pressed. Further, in FIG. 8, reference numeral 61 indicates a positioning protrusion provided on the outer periphery of the valve mounting portion 43. When the valve mounting portion 43 is inserted into the valve case 35, the valve mounting portion 61 is used to mount the valve. This prevents the center of the portion 43 from shifting.

The resin cap A for a heat exchanger according to this embodiment is constructed as described above, and the locking pawl 59 is inserted into the notch provided in the lip portion 23a of the filler neck 23, and the lid body 21 is pressed against the filler neck 23. However, when the O-rings 31 and 37 are rotated and locked to the fillet neck 23, the O-rings 31 and 37 respectively
and Firanetsk 23, and Firanetsk 23
In addition, as shown in FIG. The attached elastic packing 53 seals the cooling water flow path between the heat exchanger and the reserve tank.

Therefore, if the cooling system becomes pressurized,
As shown in FIG. 12, the valve mounting portion 43 moves away from the annular shoulder portion 41 along the inner circumference of the engagement protrusion 33 against the spring force of the pressurizing spring 27 to open the cooling water flow path. flows out to the reserve tank side through the notch 33b. As described above, when the cooling system is pressurized, the pressure acts on the tongue piece 57 and closes the cooling water flow path of the negative pressure vent 47, so that the cooling water flows from the negative pressure vent 47 to the valve mounting portion 43. Instead of flowing out to the top side of the tank, it immediately flows out to the reserve tank side.

On the other hand, when the cooling system is in a negative pressure state, the tongue piece 57 that was in contact with the back surface of the valve mounting part 43 and closing the cooling water flow path of the negative pressure vent hole 37 becomes as shown in FIG. It bends in the direction of arrow B to open the cooling water flow path and cut in the cooling water from the reserve tank 33b.
reflux into the heat exchanger. Note that even when the cooling system is pressurized or under negative pressure, the lid body 21 and the filler neck 23, and the filler neck 23 and the valve case 3
5 is maintained by O-rings 31 and 37.

As described above, according to this embodiment, it is possible to perform functions comparable to those performed by conventional metal heat exchanger caps, and it is possible to perform functions comparable to those performed by conventional metal heat exchanger caps. It is possible to achieve the function as a heat exchanger cap with a structure with a small number of parts without the need for
It became possible to reduce costs. Further, since the valve case 35 is in pressure contact with the valve seat 23a of the fillet neck 23, the torque of the lid body 1 does not act on the elastic packing 53, so that the elastic packing 53 is not affected as in the conventional case.
No permanent distortion occurs.

Note that the means for locking the lid and fillet neck is not limited to the above-mentioned embodiment, and for example, the locking portions of the lid and fillet neck may be threaded and these may be screwed together.

[Effect of idea]

As described above, according to the present invention, permanent distortion does not occur in the elastic packing that seals the cooling water flow path, so the function of the heat exchanger cap can be maintained well even after long-term use. It became.

[Brief explanation of drawings]

Fig. 1 is a central vertical end view showing the structure of the resin cap for a heat exchanger according to the present invention, Fig. 2 is a plan view of the cap body, Fig. 3 is a sectional view taken along the line - - of Fig. 2,
Figure 4 is a bottom view of the holding protrusion and mounting protrusion provided on the back of the cap body, Figure 5 is a plan view of the valve case, Figure 6 is a sectional view taken along the - line in Figure 5, and Figure 7 is the valve case. Fig. 8 is a plan view of the valve mounting part, Fig. 9 is a sectional view taken along the - line in Fig. 8,
FIG. 10 is a plan view of the elastic packing, FIG. 11 is a sectional view taken along the - line in FIG. FIG. 13 is a functional explanatory diagram of the resin cap for a heat exchanger according to the above embodiment when the cooling system is under negative pressure, and FIG. 14 is an explanatory diagram of the structure of a conventional heat exchanger cap. 21...Lid body, 23...Firanetsk, 25...
...Holding protrusion, 25b, 33b, 39a...Notch, 27...Pressure spring, 29,45...O
- Ring mounting projection, 31, 37... O-ring, 33... Engaging projection, 33a... Annular groove, 3
5... Valve case, 39... Cylindrical projection, 41...
Annular shoulder, 43...Valve mounting part, 47...Negative pressure vent, 53...Elastic packing, 55...Protrusion, 57
...Tongue piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A cover body 21 that is locked to a fillet neck 23 of a heat exchanger and has a sealing member 31 attached to the back surface thereof to ensure airtightness with the fillet neck 23; a valve case 35 that comes into pressure contact with the valve seat 23a; and a pressurization/pressure valve mechanism 42 inserted into the valve case 35
The valve case 35 includes a cylindrical engagement protrusion 33 that engages with the cylindrical holding protrusion 25 vertically provided on the back surface of the lid 21, and an annular shoulder that presses against the valve seat 23a of the fillet neck 23. 41, and a small-diameter cylindrical projection 39 into which a sealing member 37 for achieving airtightness with the filler neck 23 is fitted. The valve mounting part 43 includes a negative pressure vent 4 provided in the center.
7 and a gasket mounting hole 49 provided around it, and is configured to be pressed against the annular shoulder portion 41 of the valve case 35 by a pressure spring 27 interposed between the lid body 21 and the valve case 35. The elastic packing 53 has a movable tongue piece 57 formed with a protrusion 55 having an arcuate cross section in the center and a substantially C-shaped notch 56 around the protrusion 55.
and a plurality of rod-shaped mounting stays 5 formed on the edge.
1, and is configured to be attached to the valve attachment part 43 by fitting a plurality of rod-shaped attachment stays 51 into the gasket attachment hole 49 from the back side of the valve attachment part 43, and is configured to be attached to the valve attachment part 43. During pressure and normal times, the valve mounting part 43
The tongue piece 57 of the elastic packing 53 is brought into contact with the elastic packing 53 to close the negative pressure vent hole 47. When the cooling system is under negative pressure, the tongue piece 57 of the elastic packing 53 is bent and the negative pressure vent hole 4
7. A resin cap for a heat exchanger, characterized in that it is configured to open the cap.