JP2786172B2 - Thermal response valve for controlling the refrigerant circuit of an automobile engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a heat responsive valve for controlling a refrigerant circulation circuit for circulating a refrigerant (cooling water) of an automobile engine through a radiator circuit and a bypass circuit.

[0002]

2. Description of the Related Art In an automotive engine cooling water circulation circuit having a heat responsive valve for controlling the opening and closing of a radiator circuit and a bypass circuit, a heat responsive expansion and contraction element senses the temperature of the cooling water flowing to the engine via the bypass circuit. This drives a valve that opens and closes the radiator circuit and the bypass circuit. For this reason, in the thermally responsive valve for controlling the entrance of the pipeline leading to the engine side, the cooling water from the bypass pipeline must be positively applied to the temperature sensing portion for valve drive, that is, the thermally responsive expansion and contraction element. Open / close control of the radiator circuit and bypass circuit may not be performed accurately,
Conventionally, various measures have been taken to solve this problem.

A conventional example will be described with reference to FIGS. FIG. 14 shows an engine cooling water circulation system for an automobile. One end of a pipe (hereinafter referred to as an engine-side pipe) 9 connecting an inlet of a cooling chamber of the automobile engine 1 and an outlet of a cooling water of the radiator 2 is shown. The cooling water circulation path control thermal responsive valve 3 is provided at a branch connection portion between the two.
The other end of the radiator return pipe 4 (see FIG. 11), one end of which is connected to the cooling water outlet of the radiator 2, and the other end of the bypass pipe 5 are circulating pumps (not shown). Is connected to the hot water outlet of the cooling chamber of the vehicle engine 1 via the.

The heat responsive valve 3 for controlling the cooling water circuit is shown in FIGS.
13. The structure shown in FIG.
An annular valve seat 7 is provided at a peripheral portion of a frame 6 having a water passage window hole 19 provided through a packing 14, and an upper end of a plunger 8 is provided at a central portion of the frame 6 with a screw coupling portion 1.
1 is fixed. For this plunger 8,
The central portion of the axially-shaped thermally responsive elastic element 10 is slidably held.

[0005] A main valve body 12 to which a rubber packing 12A is vulcanized and bonded is fitted on the upper part of the thermally responsive expansion / contraction element 10 in a vertically movable manner. The portion 30 is supported in a state where the upward movement is restricted. The lower end of the valve closing spring 13 is connected to an annular spring receiving seat 1 provided on a lower outer periphery of the thermally responsive expansion / contraction element 10.
5. An erecting piece 16 rises from the symmetrical position of the spring receiving seat 15, and an arm 17 extending in an arc shape and horizontally is provided on the upper part of the erecting piece 16, and a projection 18 projecting from an upper edge of the arm 17. Is inserted into the engagement hole 20 in the peripheral edge of the annular valve seat 7 and the fitting portion is welded, so that the upright piece 16 is fixed.

The small diameter shaft portion 21 at the lower end of the thermally responsive expansion / contraction element 10
A circular hole 23 formed at the center of the valve body 22 having a substantially dish-shaped cross section is slidably fitted therein, urged downward by a valve urging spring 24, and engaged with the snap ring 25. Stopping restricts downward movement.

In the above-mentioned thermal responsive valve, the housing 26
Pipe 5 around the thermally responsive expansion element 10
When the temperature of the cooling water flowing out of the chiller is equal to or lower than a predetermined value, for example, equal to or lower than 60 ° C., the main valve body 12 is in contact with the annular valve seat 7 because the thermally responsive expansion and contraction element 10 is shortened. The flow path from the return pipe 4 to the engine-side pipe 9 is closed, and the valve element 22 is moved from the valve seat 28 on the inner end face of the bypass pipe 5 in a state where the valve urging spring 24 is extended to the maximum. The bypass pipe 5 is fully opened at a distance, so that the cooling water of the vehicle engine 1 flows as shown by the arrow in FIG. 11 without passing through the radiator 2 and circulates in the bypass circuit.

Next, when the water temperature around the thermoresponsive expansion / contraction element 10 becomes, for example, 60 ° C. to 80 ° C., the thermoresponsive expansion / contraction element 1
As the valve 0 extends, the valve body 22 descends, approaches or contacts the valve seat 28 on the inner end face of the bypass pipe 5, the opening 27 of the bypass pipe 5 is narrowed or closed, and the engine is moved from the bypass pipe 5 to the engine. The flow path leading to the side conduit 9 is controlled.

Next, when the water temperature around the thermally responsive expansion and contraction element 10 rises above, for example, 82 ° C., the thermal expansion and contraction element 10 is further extended, so that the thermal responsive expansion and contraction element 10 comes into contact with the tapered portion 30, The main valve body 12, which is restricted from moving upward from this position, descends integrally with the thermally responsive expansion / contraction element 10, separates from the annular valve seat 7 as shown in FIG. The flow path leading to the engine side pipe 9 is opened. In this way, the hot water of the automobile engine circulates through the radiator circuit, and a small amount of hot water also circulates through the bypass circuit.

As shown in FIG. 11, when the bypass pipe 5 is fully opened, the cooling water flowing out of the bypass pipe 5 flows as shown by the arrow in FIG. When the cooling water flows to the engine side pipe 9, the cooling water flowing out of the bypass pipe 5 goes straight, and as much cooling water as possible goes around to the thermally responsive expansion / contraction element 10 located immediately above the bypass pipe. From the engine side pipeline 9
Is desirable in order to drive the thermally responsive expansion / contraction element 10 more accurately.

However, since the valve element 22 having a dish-shaped cross section provided at the lower end of the thermally responsive expansion / contraction element 10 exists directly above the bypass pipe 5, the cooling water flowing out of the bypass pipe 5 There is a possibility that the coolant flows directly into the engine-side pipe line 9 while hitting the valve element 22 and a sufficient amount of cooling water does not hit the portion of the thermally responsive expansion and contraction element 10, so that the thermally responsive expansion and contraction element 10 may not be driven accurately.

In order to cope with such inconveniences, as shown in FIGS. 7 and 8, a substantially semi-cylindrical guide wall (in plan view) is provided inside the housing between the bypass line 5 and the engine-side line 9. By providing the weir 31, the flow of the cooling water toward the thermally responsive expansion / contraction element 10 may be increased. As shown in FIGS. 9 and 10, an arc-shaped flow port 33 is provided in the valve body 32, and this flow port 33 is brought into contact with the valve seat 28 provided in the bypass pipe 5, and On the flat plate surface, a cooling water flowing through the flow opening 33 is provided by cutting and raising an inclined guide wall 34 whose front end faces the thermally responsive expansion / contraction element 10 on the outer peripheral edge side of the flow opening 33.
May be turned to. Further, the valve closing spring 1
The inner inclined wall 35 of the annular spring seat 15 for locking the lower end of the third spring 3
In some cases, the outlet 36 may be opened to promote the flow of the refrigerant toward the thermally responsive expansion / contraction element 10.

However, in each of the above structures, the housing 26
In some cases, the resistance of the cooling water in the chamber may increase, and the production cost of the thermally responsive valve may increase. In particular, when a phenomenon close to a water pump occurs, a problem of cavitation may occur due to the increase in the resistance.

[0014]

SUMMARY OF THE INVENTION In a conventional thermal responsive valve,
The structure is such that the cooling water flowing out of the bypass pipe cannot be applied to the thermally responsive expansion / contraction element positively and most efficiently.Furthermore, the cooling water resistance increases and the manufacturing cost increases. As a result, the operation of the thermally responsive expansion and contraction element tends to be inaccurate, and the switching control between the radiator return line and the bypass line is not effectively performed.

An object of the present invention is to provide a thermally responsive valve for controlling a refrigerant circuit of an automobile engine which solves the above-mentioned disadvantages.

[0016]

In order to achieve the above object, the present invention provides a thermo-responsive telescopic element which is provided coaxially and is driven by the thermo-responsive telescopic element to form a radiator return line for refrigerant. Having two valves for controlling the radiator bypass line, and the refrigerant from the bypass line is driven by the heat responsive expansion / contraction element by a partial flow flowing around the heat responsive expansion / contraction element, so that the refrigerant flows out of the bypass line. A heat responsive valve in a refrigerant circuit of an engine having a mechanism for controlling an outlet to the engine side, wherein a valve for controlling an outlet from the bypass line to the engine side has one end connected to the bypass line. The other end is locked to the thermally responsive expansion and contraction element, and the diameter of the bypass pipe is enlarged. The expansion and contraction is driven by the thermally responsive expansion and contraction element, and the coil portions are closely contacted and separated. And carp Wherein the refrigerant flow gap formed between the parts is constituted by a coiled spring that is opened and closed. The other end of the coiled spring may be urged downward by a bearing spring having a higher load than the coiled spring to movably engage the thermally responsive expansion and contraction element. In addition, an enlarged diameter step portion at which one end of the coil spring is locked is provided at the open end of the bypass pipe, and the direction of the flow of the refrigerant flowing out of the bypass pipe is controlled by the guide peripheral wall. It is good to have composition. An open end of the bypass conduit is provided with a spring seat having a cup-shaped cross section in which one end of the coil-shaped spring is locked, and the spring seat is provided with a flow port for a refrigerant flowing through the bypass conduit and a refrigerant passage. It is preferable to have a configuration having an annular guide wall for controlling the flowing direction. Further, a lower end of a valve closing spring for urging a valve for controlling a flow path from the radiator return pipe to the engine-side pipe is locked to an annular spring seat, and a standing piece rising from the annular spring seat. The upper end of the radiator is fixed to a frame provided in the radiator return pipe, and the annular spring seat is provided with a flow opening for promoting the flow of refrigerant from the bypass pipe toward the thermally responsive expansion / contraction element. can do.

According to the present invention, since the valve for opening and closing the refrigerant outlet of the bypass line is constituted by a coil spring, the number of parts is small, and the bypass line can be opened and closed with a simple structure. The refrigerant flowing out of the coil can flow toward the thermally responsive expansion / contraction element smoothly without hitting an obstacle through the outflow gap between the annular portions when the coil spring extends.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 shows a state in which a valve element 37 of a bypass pipe 5 is opened, and the bypass pipe 5 and the engine side pipe 9 communicate with each other.
FIG. 2 is a side view showing a state in which the main valve body 12 of the radiator return line 4 is closed and the radiator return line 4 and the engine side line 9 are cut off. FIG. 3 shows a state opposite to that of FIG. 1, that is, a state in which the valve element 37 of the bypass pipe 5 is closed and the main valve element 12 of the radiator return pipe 4 is open.

In the thermally responsive valve of the first embodiment, the valve structure of the valve element 37 for opening and closing the outlet of the bypass pipe 5 and the lower end of the valve closing spring 13 for supporting the main valve element 12 are locked. The structure of the annular spring seat 15 is different from the structure of the thermally responsive valve shown in FIG. 11, and the other structure is the same as the structure of the thermally responsive valve shown in FIG. The description will be made with reference to FIG.

1 to 3, an annular valve seat 7 is provided integrally with a peripheral portion of a frame 6 having a water passage window hole 19 provided through a packing 14 in a radiator return line 4, and an annular valve seat 7 is provided. The upper end of the plunger 8 is fixed to the central portion of the plunger via a screw coupling portion 11. The central portion of the shaft-shaped wax-type thermally responsive expansion / contraction element 10 is slidably held by the plunger 8 so as to be movable up and down. The structure of the wax-type thermally responsive expansion and contraction element 10 is described in, for example,
No. 20697. That is, the thermally responsive expansion / contraction element 10 is configured by filling wax into the closed chamber between the rubber sleeve fitted into the plunger 8 and the bottomed cylindrical container. And plunger 8
The lower end of the plunger is formed in a tapered shape, and the thermal expansion of the wax causes a force to act on the plunger 8 in the direction in which the rubber sleeve pushes up the plunger 8 via the tapered portion, so that the upper end of the plunger 8 is fixed to the frame 6. Since the thermally responsive expansion and contraction element 10 relatively descends along the plunger 8, the thermally responsive expansion and contraction element 10 operates in the opposite direction to the above as the wax shrinks. Telescopic element 1
The main valve body 12 and the valve body 37 supported by the thermally responsive expansion / contraction element 10 operate by the expansion and contraction of 0.

The main valve body 12 is fitted on the upper part of the thermally responsive expansion / contraction element 10 so as to be able to move up and down, and is pushed up by the upper end of the valve closing spring 13 so that the upward movement is restricted by the tapered portion 30. It is supported in the state where it was done. The lower end of the valve closing spring 13 is engaged with an annular spring seat 15 provided around the lower periphery of the thermally responsive expansion and contraction element 10. An erecting piece 16 rises from a symmetrical position of the annular spring receiving seat 15, and an arm 17 extending in an arc shape and horizontally is provided on the upper part of the erecting piece 16, and a projection protruding from an upper edge of the arm 17. The upright piece 16 is fixed by inserting the 18 into the engaging hole 20 in the peripheral edge of the annular valve seat 7 and welding the fitting portion.

The annular spring seat 15 provided at the lower end of the frame 6 has an inclined wall 35 extending from the bottom surface 15A to the thermally responsive expansion / contraction element 10, and a plurality of inclined walls 35 through which a refrigerant can flow. A distribution port 36 is opened.

A valve 37 for opening and closing the opening of the bypass pipe 5 is provided on the small diameter shaft portion 21 at the lower end of the thermally responsive expansion and contraction element 10.
And a support spring 38 that urges the upper end of the valve body 37 downward, is slidably fitted.

The valve body 37 is constituted by a coil spring 37A having a substantially conical shape whose diameter is enlarged at the lower end side, that is, the bypass pipe 5 side.
The end on the larger diameter side of A is engaged with a larger diameter step 39 formed by cutting the open end of the bypass pipe 5 stepwise. The upper end of the coiled spring 37A is
Is engaged with a concave groove 41 of a slide ring 40 having a U-shaped cross section which is slidably fitted to the small-diameter shaft portion 21 at the lower end of the slide ring 40. Above the slide ring 40, a coil-shaped support spring 38 is fitted to the small-diameter shaft 21, and the upper end of the support spring 38 is fitted to the upper engaging step 42 of the small-diameter shaft 21. The lower end of the support spring 38 urges the upper end of the coil spring 37A downward via the slide ring 40. The slide ring 40 is engaged with the snap ring 44 engaged with the annular groove 43 at the lower end of the small diameter shaft portion 21, whereby the downward movement is restricted.

In the thermally responsive valve of the first embodiment, when the temperature of the cooling water flowing out of the bypass pipe 5 around the thermally responsive expansion and contraction element 10 in the housing 26 is lower than a certain value, for example, 60 ° C. or lower, Since the responsive expansion / contraction element 10 is shortened, the main valve body 12 is in contact with the annular valve seat 7,
Thereby, the radiator return line 4 to the engine side line 9
The channel leading to the valve body 37 is closed.
The coil spring 37A is extended to the maximum extent, and the refrigerant flowing out of the bypass pipe 5 through the refrigerant flow gap 45 formed between the coil portions smoothly flows upward as indicated by the arrow, and is thermally responsive. After sufficiently wrapping around the expansion / contraction element 10, it flows to the engine-side pipeline 9. At this time, the annular spring receiving seat 15 for locking the lower end of the valve closing spring 13 is provided.
Since the plurality of flow ports 36 are opened in the inclined wall 35 inside, the flow of the refrigerant to the thermally responsive expansion / contraction element 10 becomes even smoother. Further, in order to lock the lower end of the enlarged diameter of the coil spring 37A, the guide peripheral wall 46 of the enlarged diameter stepped portion 39 cut and formed at the open end of the bypass pipe 5 causes the refrigerant flowing out of the bypass pipe 5 to flow out. It can be controlled so that the direction is toward the thermally responsive expansion and contraction element 10.
As described above, in FIG. 1, the cooling water of the vehicle engine 1 flows as shown by the arrow in FIG. 1 without passing through the radiator 2 and circulates in the bypass circuit.

Next, when the temperature of the water around the thermally responsive expansion and contraction element 10 becomes, for example, 60 ° C. to 80 ° C., the upper end of the coiled spring 37A constituting the valve element 37 is pushed down by the expansion of the thermally responsive expansion and contraction element 10. Then, the refrigerant flow gap 45 between the coil portions is narrowed, and finally the gap is closed, and the flow path from the bypass pipe 5 to the engine-side pipe 9 is controlled.

Next, when the temperature of the water around the thermoresponsive expansion / contraction element 10 rises above, for example, 82 ° C., the expansion of the thermoresponsive expansion / contraction element 10 causes the tapered portion 30 of the thermoresponsive expansion / contraction element 10 to extend.
The main valve body 12, which is restricted from moving upward from the contact position at the position, descends, separates from the annular valve seat 7 as shown in FIG. 3, and moves from the radiator return line 4 to the engine side line 9. The communicating flow path is opened. In this way, the hot water of the automobile engine circulates through the radiator circuit, and a small amount of hot water also circulates through the bypass circuit.

FIGS. 4 to 6 show a thermally responsive valve according to a second embodiment of the present invention. In the second embodiment, the locking structure at the lower end and the upper end of the coiled spring 37A constituting the valve body 37 and the structure for guiding the small diameter shaft portion 21 at the lower end of the thermally responsive expansion / contraction element 10 are the first. It is slightly different from the embodiment.

In the second embodiment, the inner end of the bypass pipe 5 extends straight into the housing 26 of the thermally responsive valve, and the inner end face 47 of the bypass pipe 5 has a guide at the center. A bottom peripheral edge 50 of a spring receiving seat 49 having a substantially cup-shaped cross section having a hole 48 is fixed. This spring seat 4
9 is a refrigerant outlet 5 communicating with the bypass pipe 5 on the bottom surface.
1 and an annular guide wall 52 on the periphery.

On the other hand, a flange-shaped spring receiving seat 53 is slidably fitted over the small diameter shaft portion 21 at the lower end of the thermally responsive expansion / contraction element 10, and is fitted into an annular groove 54 formed in the small diameter shaft portion 21. The lower movement is provided by the combined snap ring 55, and on the upper surface of the flange-shaped spring receiving seat 53,
The lower end of the support spring 38 fitted to the small diameter shaft portion 21 is locked, and the valve body 37
Is locked at the upper end of the substantially conical coiled spring 37A. The lower end of the coil spring 37A is
The spring receiving seat 49 having a cup-shaped cross section is engaged with an inner bottom surface peripheral portion.

The lower portion of the small-diameter shaft portion 21 is slidably fitted in a guide hole 48 at the center of the bottom of the spring seat 49 and engages with the annular groove 56 at the lower end of the small-diameter shaft portion 21. By engaging the snap ring 57 with the lower peripheral edge of the guide hole 48, the small-diameter shaft portion 21 is prevented from being detached from the guide hole 48.

According to the second embodiment of the present invention, the first
As in the embodiment, the inner end enlarged diameter step portion 39 of the bypass conduit 5 is provided.
However, since the spring receiving seat 49 has the annular guide wall 52, as shown in FIG.
When the valve body 37 is opened, the refrigerant flowing out of the bypass pipe 5 passes through the circulation port 51 on the bottom surface of the spring seat 49 and further flows through the refrigerant circulation gap 45 between the coils of the substantially conical coil spring 37A. As described above, the flow direction is controlled by the annular guide wall 52 and the inclined wall 35 of the annular spring seat 15 is formed.
, Flows smoothly in the direction of the thermally responsive expansion and contraction element 10, and then flows to the engine-side pipe 9.

In the second embodiment of the present invention, the small-diameter shaft portion 21 is slidably fitted in the guide hole 48 at the center of the bottom of the spring seat 49 so that the thermally responsive expansion and contraction element 1 can be slid.
0 can move up and down stably. Other configurations and operations are the same as those of the first embodiment of the present invention. Therefore, the same components are denoted by the same reference numerals and the description thereof will not be repeated.

[0034]

As described above, according to the present invention, in the thermally responsive valve for controlling the refrigerant circuit of an automobile engine, the diameter of the valve body for controlling the outlet of the bypass pipe is increased on the bypass pipe side. Driven by the thermally responsive expansion and contraction element, it expands and contracts, and the coil section is formed of a coil-shaped spring that opens and closes the refrigerant flow gap formed between the coil sections due to close contact and separation between the coil sections. The refrigerant flowing out flows smoothly to the thermally responsive expansion / contraction element through the refrigerant flow gap,
Since there is no spring seat or the like as in the conventional structure, the flow of the refrigerant toward the thermally responsive expansion and contraction element is not hindered, and even when the flow of the refrigerant flowing out of the bypass pipe at a low flow rate such as at the time of idling, An aggressive flow of the refrigerant toward the temperature sensing part of the thermally responsive expansion and contraction element can be created, and the configuration is simple and easy to manufacture.

Further, in the case where a diameter-enlarged step portion for locking the coil spring is provided at the inner end of the bypass line portion, the guide peripheral wall of the diameter-enlarged step portion or the opening end of the bypass line portion may be provided. When a cup-shaped guide member with a bottom that locks the coil spring is provided, the annular guide wall of the guide member serves as a guide, further promoting the flow of the refrigerant flowing out of the bypass pipe toward the thermally responsive expansion / contraction element. And
Further, the flow is further promoted by providing a flow opening in the inclined wall of the annular spring seat for locking the lower end of the valve closing spring that lifts and supports the main valve body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, in a state where a bypass pipe is opened and a radiator return pipe is closed.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view showing a state in which a bypass line is closed and a radiator return line is opened in FIG. 1;

FIG. 4 is a sectional view showing a second embodiment of the present invention, in a state where a bypass pipe is opened and a radiator return pipe is closed.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a cross-sectional view showing a state where a bypass pipe is opened and a radiator return pipe is opened in FIG. 4;

FIG. 7 is a cross-sectional view of the thermally responsive valve shown as the first comparative example in a state where a bypass pipe is opened and a radiator return pipe is closed.

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a cross-sectional view of a thermally responsive valve shown as a second comparative example in a state where a bypass pipe is opened and a radiator return pipe is closed.

FIG. 10 is a plan view of the valve body in FIG. 9;

FIG. 11 is a cross-sectional view showing a state in which a bypass pipe is opened and a radiator return pipe is closed in a conventional thermally responsive valve.

FIG. 12 is a side view of FIG. 9;

FIG. 13 is a cross-sectional view showing a state in which a bypass line is closed and a radiator return line is opened in FIG. 11;

FIG. 14 is an automobile engine cooling water circulation system diagram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 automotive engine 2 radiator 3 heat-responsive valve for controlling cooling water circulation path 4 radiator return line 5 bypass line 6 frame 7 annular valve seat 8 plunger 9 engine-side line 10 thermal-responsive expansion / contraction element 11 screw connection part 12 main valve Body 13 Spring for closing a valve 14 Packing 15 Annular spring seat 15A Bottom surface 16 Standing piece 17 Arm 18 Projection 19 Water window hole 20 Engagement hole 21 Small diameter shaft portion 22 Valve body 23 Circular hole portion 24 Valve spring Reference Signs List 25 snap ring 26 housing 27 opening 28 valve seat 30 taper portion 31 guide wall (weir) 32 valve body 33 flow port 34 inclined guide wall 35 inclined wall 36 flow port 37 valve body 37A coiled spring 38 support spring 39 expanding step Part 40 slide ring 41 concave groove 42 engagement step part 43 annular groove 44 snap ring 45 refrigerant flow gap 46 guide jacket 47 inner end face 48 guide hole 49 spring seat 50 bottom peripheral edge 51 flow ports 52 annular guide wall 53 a flange-like spring seat 54 an annular groove 55 snap ring 56 annular groove 57 snap ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/68 F01P 7/16 502 F16K 13/00

Claims (5)

(57) [Claims] And a valve for controlling a radiator return line of the refrigerant and a radiator bypass line, the valve being provided coaxially with the thermally responsive expansion and contraction element and being driven by the thermally responsive expansion and contraction element. The engine having a mechanism for controlling the outlet from the bypass line to the engine side by driving the thermoresponsive expansion / contraction element by a partial flow in which the refrigerant from the bypass conduit flows around the thermoresponsive expansion / contraction element, One end of the valve for controlling the outlet from the bypass line to the engine side, which is a thermoresponsive valve in the refrigerant circuit, is locked at the bypass line, and the other end is locked at the thermoresponsive expansion / contraction element. The diameter of the bypass pipe is enlarged, and expanded and contracted by being driven by the thermally responsive expansion and contraction element. The gap between the coil sections is brought into close contact with and separated from each other, thereby opening and closing the refrigerant flow gap formed between the coil sections. Coiled coil A thermally responsive valve for controlling the vehicle engine refrigerant circuit, which is composed of a pulling. 2. The coil spring according to claim 1, wherein the other end of the coil spring is urged downward by a bearing spring having a higher load than the coil spring and is movably locked to the thermally responsive expansion and contraction element. A heat responsive valve for controlling a refrigerant circuit of an automobile engine according to the above. 3. An enlarged-diameter stepped portion to which one end of the coiled spring is locked at an open end of the bypass conduit,
3. The thermally responsive valve for controlling a refrigerant circuit of an automobile engine according to claim 1, wherein a direction of a flow of the refrigerant flowing out of the bypass pipe is controlled by the guide peripheral wall. 4. A spring seat having a cup-shaped cross section, at which one end of the coil spring is locked, is provided at an open end of the bypass line, and the spring seat is used to flow refrigerant flowing through the bypass line. 3. The thermally responsive valve according to claim 1, further comprising an opening and an annular guide wall for controlling a flow direction of the refrigerant. 5. A lower end of a valve closing spring for urging a valve for controlling a flow path from the radiator return line to the engine side line is engaged with an annular spring seat, and stands from the annular spring seat. The upper end of the rising up piece is fixed to a frame provided in the radiator return pipe, and a flow port for promoting the flow of refrigerant from the bypass pipe to the thermally responsive expansion element is opened in the annular spring seat. The heat responsive valve for controlling a refrigerant circuit of an automobile engine according to any one of claims 1 to 4, wherein: