thermostatic device

Abstract

Provided is a thermostat capable of improving temperature sensitivity and responsiveness, and eliminating problems of unstable operation of a control valve and problems of oscillation. The thermostat is provided with: a housing (3) provided with a first flow inlet (5a) that receives a coolant from a radiator, a second flow inlet (4b) that receives a coolant that has passed through a bypass passage, and a flow outlet (4c) that discharges a mixture of the respective coolants; a thermoelectric element (2a) housed in the housing (3) and displaced in an axial direction in response to a temperature of the coolant from the second flow inlet (4b); a control valve (2c) that controls an amount of the aforementioned coolant from the first flow inlet to be introduced in conjunction with displacement of the thermoelectric element (2a); a valve seat (5c) formed at a front end of a ring-shaped protrusion (5d) protruding in a direction of a displacement axis of the thermoelectric element (2a) in the housing (3), the control valve (2c) abutting against the valve seat (5c) in a closed valve state; and a ring-shaped groove (3d) composed of a ring-shaped gap that is continuous in a circumferential direction and is applied to an outer side of the valve seat (5c).

Description

Technical Field

[0001] The present invention relates to a thermostatic device, which is configured, for example, in a circulation path that circulates coolant between an internal combustion engine (hereinafter also referred to as an engine) and a radiator in a vehicle, to appropriately control the temperature of the coolant. Background Technology

[0002] The thermostat has a built-in thermoelectric element with a thermal expansion body (wax) that expands / contracts in response to temperature changes in the coolant flowing in the circulation path between the engine and the radiator. The thermostat works by controlling the opening and closing of a valve (valve body) by the volume change associated with the expansion / contraction of the thermal expansion body, thereby maintaining the coolant at a predetermined temperature.

[0003] That is, a thermoelectric actuation unit, including a control valve and a thermoelectric element with a built-in thermal expansion element, is housed within a housing, for example, disposed on the inlet side of the engine's cooling water passage. Moreover, when the coolant temperature is low, the control valve is closed, and the coolant circulates through a bypass passage instead of the radiator.

[0004] Additionally, when the coolant temperature rises, the control valve is opened, allowing the coolant to circulate through the radiator. This ensures that the temperature of the coolant flowing through the engine's cooling water circuit, specifically the water jacket, is maintained at an appropriate level.

[0005] Therefore, this thermostatic device includes a housing having a first inlet for receiving coolant from the radiator side, a second inlet for receiving coolant that bypasses the radiator via a bypass passage, and a coolant supply port for mixing the coolant from the first and second inlets and supplying coolant to the engine's water jacket side. Furthermore, a thermoelectric actuation unit is housed within the housing, which has a control valve that controls the amount of coolant introduced from the first inlet in accordance with the axial movement of a thermoelectric element (e.g., Patent Document 1).

[0006] Figure 10 The diagram schematically illustrates the flow of coolant within the housing of an existing thermostat.

[0007] The thermostatic device 11 is constructed by housing a thermoelectric actuation unit 15 inside the outer casing 12, which is composed of a housing 13 and an inlet 14.

[0008] On the inlet 14 side constituting the aforementioned outer casing 12, a first inlet 14a is formed as an inlet for coolant flowing from the radiator side. Similarly, on the housing 13 side constituting the outer casing 12, a second inlet 13a is formed as an inlet for coolant flowing from the bypass passage that bypasses the aforementioned radiator.

[0009] Furthermore, the coolant from the aforementioned inlets 13a and 14a mixes within the housing 12 and is then discharged through the coolant outlet 13b toward the engine's water jacket or water pump.

[0010] On the other hand, the aforementioned thermoelectric actuation unit 15 includes: a thermoelectric element (temperature sensing part) 15a, which has a built-in thermal expansion body (wax) that reacts to the temperature of the coolant; a piston 15b, which expands and contracts by the action of the aforementioned thermal expansion body; a circular plate-shaped control valve (valve body) 15c, which is mounted on the thermoelectric element 15a; and a spring member 15d, which causes the control valve 15c to abut against the inlet 14 side and apply force to the closed valve state.

[0011] Furthermore, the opening state of the control valve 15c is controlled by mounting the front end of the piston 15b on the shaft support portion 14b formed in the aforementioned inlet 14, based on the temperature of the coolant applied to the thermoelectric element 15a. Thus, specifically, it operates in such a way that the inflow rate of coolant from the radiator side is adjusted to appropriately maintain the coolant temperature applied to the engine.

[0012] Prior art literature

[0013] Patent documents

[0014] Patent document 1: WO2007 / 108273. Summary of the Invention

[0015] The problem that the invention aims to solve

[0016] In this thermostatic device 11, the cooled coolant from the radiator side flows into the housing 12 from the first inlet 14a and flows out of the housing 12 towards the engine side from the outlet 13b. Figure 10 (C, arrow C)

[0017] Furthermore, in the thermostat 11, if the opening amount of the control valve 15c increases, the flow of coolant from the second inlet 13a is blocked. However, when the valve is opened, the high-temperature coolant from the bypass passage side, which does not pass through the radiator, flows into the housing 12 from the second inlet 13a and flows out of the housing 12 from the outlet 13b towards the engine side.

[0018] When the control valve 15c begins to open, if the opening amount of the control valve 15c is small, and the cooled coolant from the radiator side flows around the thermoelectric element 15a, the temperature around the thermoelectric element 15a will decrease, reducing its sensitivity and responsiveness to the temperature of the hot coolant from the bypass passage. Furthermore, the temperature of the portion through which the cooled coolant passes will locally decrease, causing a temperature deviation around the thermoelectric element 15a, further reducing its sensitivity and responsiveness, or causing the operation of the control valve 15c to become unstable or oscillate.

[0019] The present invention addresses the technical problems of the aforementioned existing thermostat devices, and its objective is to provide a thermostat device that can improve temperature sensitivity and responsiveness and suppress the instability or oscillation of the control valve.

[0020] Solution for solving the problem

[0021] The temperature control device of the present invention, made to solve the aforementioned problems, as described in technical solution 1, comprises: a housing having an inner chamber formed therein, and having: a first inlet-side pipe having a first inlet at one end for introducing coolant cooled by a radiator into the aforementioned chamber; a second inlet-side pipe having a second inlet at one end for introducing coolant heated in an internal combustion engine without passing through the aforementioned radiator into the aforementioned chamber; and an outlet-side pipe having a outlet at one end for supplying coolant from the aforementioned chamber to the aforementioned internal combustion engine. The coolant outlet; a thermoelectric element housed in the aforementioned housing chamber and moving axially depending on the temperature of the coolant; a control valve that controls the amount of coolant introduced from the aforementioned first inlet as the thermoelectric element moves; a valve seat formed within the aforementioned housing at the front end of an annular protrusion protruding along the moving axis of the aforementioned thermoelectric element, the aforementioned control valve abutting against the aforementioned valve seat in the closed state; and an annular groove formed by a continuous annular gap in the circumferential direction applied to the outside of the aforementioned valve seat, and having an open end formed along the aforementioned valve seat.

[0022] According to the invention described in technical solution 1, the valve seat that the control valve abuts in the closed state is formed at the front end of the annular protrusion. Moreover, an annular groove is formed by a continuous annular gap applied to the outside of the valve seat in the circumferential direction, and the opening end of the annular groove is formed along the aforementioned valve seat.

[0023] Accordingly, when the control valve is slightly open, most of the cooled coolant from the radiator side introduced into the first inlet is bounced off the periphery of the control valve and flows in a rotating manner along the annular groove, acting toward the coolant outlet.

[0024] Therefore, it is possible to suppress the flow of coolant from the radiator side toward the thermoelectric element side, resulting in improved temperature sensitivity and responsiveness, and preventing the control valve from becoming unstable or oscillating.

[0025] In this case, ideally, the configuration is as follows: as described in technical solution 2, an inclined surface is formed on one side of the moving direction of the thermoelectric element in the inner peripheral wall of the aforementioned outlet side pipe, such that it is inclined toward the aforementioned one side as it approaches the aforementioned receiving chamber from the aforementioned outlet side, and the receiving chamber side end of the aforementioned inclined surface is located in the range from the position of the aforementioned valve seat toward the aforementioned one side, and is connected to the peripheral wall of the aforementioned annular groove.

[0026] According to the invention described in technical solution 2, it is configured as follows: on one side of the moving direction of the thermoelectric element in the inner peripheral wall of the outlet side pipe, an inclined surface is formed such that it is inclined toward the aforementioned side as it approaches the receiving chamber from the outlet side, and the receiving chamber side end of the aforementioned inclined surface is located in the range from the position of the aforementioned valve seat toward the aforementioned side and is connected to the peripheral wall of the aforementioned annular groove.

[0027] Accordingly, the coolant from the radiator side, which flows in a rotating manner along the annular groove, can easily flow out from the aforementioned annular groove through the inclined surface toward the aforementioned outlet.

[0028] Therefore, thermoelectric elements are less susceptible to the effects of coolant from the radiator side, which helps to further improve temperature sensitivity and responsiveness.

[0029] Furthermore, in a preferred embodiment of the constant temperature device involved in the present invention, as described in technical solution 3, the aforementioned outer shell is configured to have a housing and an inlet joined to the housing, the aforementioned annular protrusion is provided at the aforementioned inlet in such a way that it protrudes into the aforementioned housing, and the aforementioned annular groove is formed between the outer circumferential surface of the aforementioned annular protrusion and the inner circumferential surface of the aforementioned housing.

[0030] According to the invention described in technical solution 3, the aforementioned annular groove can be formed inside the housing by joining the inlet to the housing that constitutes the housing.

[0031] Therefore, for example, in the case of wanting to obtain a resin shell, there is no need for special molding processes to make annular grooves inside the shell, and it is possible to provide products that reduce costs.

[0032] Invention Effects

[0033] According to the present invention, a constant temperature device can be provided that improves temperature sensitivity and responsiveness and stabilizes the operation of the control valve. Attached Figure Description

[0034] Figure 1This is a front view showing the overall configuration of a first embodiment of the thermostat device according to the present invention.

[0035] Figure 2 It is Figure 1 A partial cross-sectional view showing the front half of the outer shell.

[0036] Figure 3 It is a partial cross-sectional view taken from the cutting direction by cutting the left half of the outer shell.

[0037] Figure 4 It is a three-dimensional diagram showing the overall structure of the thermostat.

[0038] Figure 5 From Figure 4 The image shown is a 3D view of the state after the top and bottom are reversed.

[0039] Figure 6 This is a partial cross-sectional view showing the flow of coolant after the control valve is opened.

[0040] Figure 7 It is an enlarged cross-sectional view of the annular groove and the inclined surface.

[0041] Figure 8 This is a partial cross-sectional view showing the main parts of a second embodiment of the thermostat device according to the present invention.

[0042] Figure 9 It is relative to Figure 8 A partial cross-sectional view of the shaft after it has been rotated 90 degrees.

[0043] Figure 10 This is a partial cross-sectional view illustrating an example of coolant flow in an existing thermostat. Detailed Implementation

[0044] The constant temperature device according to the present invention will be described based on the embodiment shown in the figure. First, Figures 1 to 7 The temperature control device 1 of the first embodiment is shown, wherein, Figures 1 to 5 The overall structure of the temperature control device 1 according to the first embodiment is shown.

[0045] The thermostatic device 1 is configured in the circulation path that allows coolant to circulate between the engine and the radiator, and is composed of a thermoelectric actuation unit 2 that controls the temperature of the coolant supplied to the engine, housed in the outer casing 3.

[0046] That is, the temperature control device 1 is disposed at the intersection of the cooling water passage from the radiator side and the bypass passage from the engine outlet side that does not pass through the radiator, and operates in the following manner: mixing the coolant cooled by the radiator and the coolant heated by the engine through the bypass passage, and appropriately controlling the temperature of the coolant reaching the engine inlet.

[0047] Furthermore, for ease of explanation, the following will be... Figure 1 In the configuration of the constant temperature device 1 shown, the upper and lower parts in the attached drawing are simply represented as "upper" and "lower" as they are.

[0048] In this embodiment, the outer shell 3 constituting the outer frame of the constant temperature device 1 is composed of a housing 4 and an inlet 5 installed on the upper part of the housing 4. Both the housing 4 and the inlet 5 are formed from resin raw materials.

[0049] At the aforementioned inlet 5, there is a first inlet-side pipe 3a with a cylindrical first inlet 5a for receiving coolant from the radiator side. This first inlet-side pipe 3a is bent at approximately 60 degrees relative to the axis of movement of the thermoelectric actuation unit 2 described later (see reference). Figure 1 , Figure 2 The state of ) is formed.

[0050] Additionally, in the housing 4, a unit housing space 4a is formed in the center to house the thermoelectric action unit 2, and a second inlet side pipe 3b with a cylindrical second inlet 4b is formed downward from the unit housing space 4a, through which coolant from the bypass passage is introduced into the second inlet 4b.

[0051] Furthermore, in the aforementioned housing 4, an outlet-side pipe 3c is formed with a coolant outlet 4c, which supplies coolant to the engine side in a direction orthogonal to the moving axis of the thermoelectric actuation unit 2.

[0052] Furthermore, the outlet-side pipe 3c, which has a coolant outlet 4c, is configured to be positioned upstream of the water pump that supplies coolant to the engine. Therefore, a flange 4d for direct connection to the thermostat 1 is formed on the water pump side (not shown), and an insertion through hole 4e for a fastening bolt is formed at a position 180 degrees opposite to the flange 4d (see reference). Figure 4 , Figure 5 Furthermore, an annular gasket 4f, which engages with the water pump side, is installed along the opening of the coolant outlet 4c in a manner that surrounds the outlet 4c.

[0053] The thermoelectric actuation unit 2, housed in the unit housing space 4a of the outer casing 3, has a cylindrical thermoelectric element (temperature sensing part) 2a with a built-in thermal expansion body (wax) that expands / contracts depending on the temperature of the coolant. The piston 2b, which is arranged along the axis of the thermoelectric element 2a, moves by extending and retracting from the thermoelectric element 2a due to the expansion and contraction of the aforementioned thermal expansion body.

[0054] The front end of the aforementioned piston 2b is inserted into the central upper part of the shaft support portion 5b formed in the inlet 5 constituting the housing 3, thereby being installed inside the housing 3.

[0055] Therefore, the cylindrical thermoelectric element 2a operates by moving axially within the unit housing space 4a in conjunction with the extension and retraction of the piston 2b. That is, in this embodiment, the thermoelectric element 2a moves vertically. In other words, the direction of movement of the thermoelectric element 2a is vertical, and in this embodiment, one of the directions of movement of the thermoelectric element in the claims is the upper side.

[0056] In addition, a circular plate-shaped control valve (valve body) 2c is installed on the upper part of the thermoelectric element 2a. The valve body formed on the outer periphery of the control valve 2c becomes a closed valve by abutting against the annular valve seat 5c formed in the lower opening of the inlet 5.

[0057] Furthermore, the spring component 2d is arranged to surround the thermoelectric element 2a, such that one end of the spring component 2d is connected to the control valve 2c, and the other end of the spring component 2d abuts against the aforementioned inner bottom 4g of the housing 4 in a manner surrounding the guide portion 4h formed in a manner that rises from the inner bottom 4g of the housing 4 (see reference). Figure 2 , Figure 3 ).

[0058] Therefore, the aforementioned spring component 2d applies force, causing the circular control valve 2c to press against the annular valve seat 5c formed at the inlet 5.

[0059] Furthermore, the lower part of the thermoelectric element 2a is supported by the aforementioned guide portion 4h in a manner that allows the lower part of the thermoelectric element 2a to slide freely. The guide portion 4h has holes, grooves, or cutouts (not shown) formed therein, allowing coolant flowing into the housing 3 from the second inlet 4b to flow into the unit housing space 4a through the aforementioned holes, grooves, or cutouts in the guide portion 4h.

[0060] According to the thermostatic device 1 configured as described above, the coolant supplied from the bypass passage side to the second inlet 4b is mainly supplied toward the thermoelectric element 2a.

[0061] Therefore, if the temperature of the coolant from the bypass passage side rises, the thermal expansion body built into the thermoelectric element 2a expands, and the aforementioned piston 2b extends (protrudes).

[0062] As a result, the control valve 2c installed on the thermoelectric element 2a opens by resisting the force of the spring component 2d and retracting toward the second inlet 4b, and the coolant from the first inlet 5a that has passed through the radiator is introduced.

[0063] Therefore, the coolant from the first inlet 5a and the coolant from the second inlet 4b are mixed and fed from the coolant outlet 4c toward the engine's water jacket or water pump. This allows the temperature of the coolant passing through the engine's water jacket to be controlled to an appropriate level.

[0064] However, in this implementation, such as Figure 2 and Figure 3 As shown, the valve seat 5c that the aforementioned control valve 2c abuts against in the closed state is formed within the housing 3 at the front end of an annular protrusion 5d that protrudes along the moving axis of the thermoelectric element 2a. Furthermore, the lower end opening (opening end 3e) of the annular groove 3d is formed surrounding the aforementioned valve seat 5c.

[0065] Moreover, in this embodiment, such as Figure 3 As shown, the outlet-side pipe 3c, extending from the valve seat 5c inside the housing towards the coolant outlet 4c, is formed in a direction orthogonal to the moving axis of the thermoelectric element 2a. The chamber-side end of the outlet-side pipe 3c faces the side portion of the thermoelectric element 2a. Furthermore, an upwardly inclined surface 4i is formed on the upper part of the inner peripheral wall of the aforementioned outlet-side pipe 3c, extending from the outlet 4c side towards the aforementioned annular groove 3d.

[0066] Regarding the aforementioned annular groove 3d and inclined surface 4i, the control valve 2c is also in the open state when it slightly moves away from the valve seat 5c. Figure 6 and Figure 7 It is shown in the text.

[0067] In particular Figure 7 The annular groove 3d and a portion of the inclined surface 4i are shown in an enlarged state. The annular groove 3d is formed at the junction of the housing 4, which constitutes the outer shell 3, and the inlet 5.

[0068] More specifically, the inlet 5 has a flange 5e with a larger outer diameter compared to other parts. This flange 5e is joined to the upper opening edge of the housing 4 by means of welding or the like, thereby integrating the housing 4 and the inlet 5 into a single outer shell 3. Additionally, an annular protrusion 5d is provided at the inlet 5, protruding into the housing 4 from the inner circumferential end of the flange 5e. The outer diameter of this annular protrusion 5d is smaller than the upper inner diameter of the housing 4 located on its outer periphery. A continuous annular gap is formed on the outer periphery of the annular protrusion 5d, forming an annular groove 3d.

[0069] Therefore, in this embodiment, the aforementioned annular groove 3d is formed between the outer circumferential surface 5f of the annular protrusion 5d and the inner circumferential surface 4j of the aforementioned housing 4, and the opening end 3e of the annular groove 3d is disposed on the outside surrounding the aforementioned valve seat 5c.

[0070] In addition, a valve seat 5c is formed at the front end of the annular protrusion 5d, and the wall thickness of the annular protrusion 5d constituting the inlet 5, the flange portion 5e, the portion connected to the first inlet side pipe 3a from them, and the first inlet side pipe 3a are formed to be approximately uniform. Therefore, when the inlet 5 is formed of synthetic resin, its dimensional accuracy can be improved.

[0071] Furthermore, a flange 5e protruding outward from the base end (opposite to the front end) of the annular protrusion 5d is fused to the housing 4. As described above, a valve seat 5c is formed at the front end of the annular protrusion 5d, thus allowing the valve seat 5c to detach from the fused portion. Consequently, due to the fusion, strain is generated in the valve seat 5c, preventing coolant leakage between them when the control valve 2c abuts against the valve seat 5c.

[0072] On the other hand, the chamber-side end 4k of the inclined surface 4i is located on one of the aforementioned sides in the moving direction from the aforementioned valve seat 5c toward the thermoelectric element 2a. Figure 7 Within the range of the upper side of the chamber, the end 4k of the accommodating chamber is connected to the peripheral wall of the annular groove 3d.

[0073] In other words, the end (upper end) 4k of the annular groove 3d side with inclined surface 4i is located higher than the lower end of valve seat 5c.

[0074] Based on the aforementioned configuration of the annular groove 3d and the inclined surface 4i, when the control valve 2c is partially open, the cooled coolant from the radiator side introduced into the first inlet 5a is rebounded at the periphery of the control valve 2c, as shown in... Figure 6 As indicated by the arrow pointing in the direction of A, after flowing in a manner that rotates along the annular groove 3d, it acts in a manner that moves toward the coolant outlet 4c.

[0075] Therefore, it is possible to suppress the flow of coolant from the radiator side toward the thermoelectric element 2a side. As a result, the temperature sensing and responsiveness of the temperature control device 1 are improved, and it is possible to prevent the operation of the control valve 2c from becoming unstable or oscillating.

[0076] In addition, an inclined surface 4i is formed in the outlet side pipe 3c of the coolant outlet 4c. The chamber side end 4k of the inclined surface 4i is located in the direction of the moving axis of the thermoelectric element 2a within the range from the valve seat 5c position toward the first inlet 5a, and communicates with the opening end 3e of the annular groove 3d. Therefore, the coolant from the radiator side, which flows in a manner that rotates along the annular groove 3d, flows out from the aforementioned annular groove 3d through the inclined surface 4i toward the aforementioned outlet 4c without resistance.

[0077] Therefore, thermoelectric element 2a is less susceptible to the influence of coolant from the radiator side, which helps to further improve temperature sensitivity and responsiveness, stabilize the operation of control valve 2c, and suppress oscillation.

[0078] In the temperature control device 1 of the first embodiment described above, the inlet 5 and the shell 4 constituting the outer shell 3 are both formed of resin material as already described, and the two are preferably joined by fusion bonding, but the joining method can be appropriately modified. In addition, the inlet 5 and the shell 4 can also be constructed using metal materials or the like.

[0079] Figure 8 and Figure 9 A temperature control device 1 according to a second embodiment of the present invention is shown. Furthermore, in the illustration of the second embodiment... Figure 8 and Figure 9 In the diagram, the same symbols are used to indicate the implementations and those already described. Figures 1 to 7 The thermostat device 1 of the first embodiment shown has the same function as the thermostat device 1 shown, therefore, its detailed description is appropriately omitted.

[0080] Regarding the constant temperature device 1 of the second embodiment, the shell 4 constituting the outer shell 3 and the inlet 5 are both made of metal material, and the two are joined by a gasket 5g embedded in the inlet 5 in a ring shape.

[0081] Furthermore, the temperature control device 1 of the second embodiment is configured such that: the other end of the spring member 2d that applies force to the control valve 2c toward the valve seat 5c is received by the spring receiving member 2e, and a pair of opposing legs 5h integrally formed with the inlet 5 (see reference) Figure 9 The spring receiving component 2e is supported.

[0082] In the temperature control device 1 of the second embodiment, as follows Figure 8 As shown, a valve seat 5c is formed at the front end of the annular protrusion 5d that protrudes along the moving axis of the thermoelectric element 2a, and an annular groove 3d is formed around the aforementioned valve seat 5c.

[0083] Furthermore, in the outlet-side pipe 3c from the annular groove 3d toward the coolant outlet 4c, there is an inclined surface 4i that is inclined toward one of the moving directions toward the thermoelectric element 2a as it approaches the aforementioned receiving chamber 4a from the aforementioned outlet 4c side. The receiving chamber-side end 4k of the inclined surface 4i is located in the range from the valve seat 5c position toward the aforementioned one side and is connected to the peripheral wall of the annular groove 3d.

[0084] Therefore, in the constant temperature device 1 of the second embodiment, as in Figure 8 As shown by the arrow pointing in the direction of B, the coolant flowing toward the outlet 4c flows in a rotating manner along the annular groove 3d as the control valve 2c is opened, and flows out of the annular groove 3d through the inclined surface 4i toward the outlet 4c without resistance.

[0085] Therefore, similar to the thermostatic device 1 of the first embodiment described above, the thermoelectric element 2a is less affected by the coolant from the radiator side, resulting in a thermostatic device 1 that can provide improved temperature sensitivity and responsiveness and also suppress the occurrence of oscillation.

[0086] Furthermore, in the temperature control device 1 of the first and second embodiments described above, the following configuration is adopted: the outlet side pipe 3c from the valve seat 5c inside the housing 3 toward the coolant outlet 4c is formed in a direction orthogonal to the moving axis direction of the thermoelectric element 2a. However, this angle does not necessarily have to be orthogonal; an appropriate angle can be selected to obtain the same effect.

[0087] Industrial availability

[0088] As described above, the thermostatic device according to the present invention is useful as a device for supplying coolant to the engine of an automobile, and in particular, is suitable for controlling the temperature of the coolant supplied to the engine to an appropriate state.

[0089] Symbol Explanation

[0090] 1. Temperature control device

[0091] 2 Thermoelectric Actuation Unit

[0092] 2a Thermoelectric element

[0093] 2b Piston

[0094] 2c Control valve (valve body)

[0095] 2D spring components

[0096] 2e Spring receiving component

[0097] 3. Outer shell

[0098] 3a First inlet side piping

[0099] 3b Second inlet side piping

[0100] 3c Outlet side pipeline

[0101] 3D annular groove

[0102] 3e Open end

[0103] 4. Shell

[0104] 4a Unit containment space (containment room)

[0105] 4b Second Stream Entrance

[0106] 4c Coolant outlet

[0107] 4i bevel

[0108] 4j Inner circumferential surface of the shell

[0109] The 4k inclined plane at the end of the receiving chamber

[0110] 5 entrances

[0111] 5a First-class entrance

[0112] 5c valve seat

[0113] 5d annular protrusion

[0114] 5f Outer circumferential surface of the annular protrusion

[0115] 5h Foot.

Claims

1. A constant temperature device, characterized in that, have: The outer casing has an inner cavity and has the following features: The first inlet side pipe has a first inlet formed at one end to guide the coolant cooled by the radiator into the containment chamber; The second inlet side pipe has a second inlet at one end that introduces the coolant heated in the internal combustion engine without passing through the radiator into the containment chamber. as well as The outlet-side pipe has an outlet at one end that supplies coolant from the containment chamber to the internal combustion engine. A thermoelectric element, which is housed in the housing chamber and moves axially depending on the temperature of the coolant; A control valve that controls the amount of coolant introduced from the first inlet as the thermoelectric element moves; A valve seat, formed within the housing at the front end of an annular protrusion projecting along the moving axis of the thermoelectric element, wherein the control valve abuts against the valve seat in the closed state; and The annular groove is formed by a continuous annular gap along the circumferential direction applied to the outer side of the valve seat, and has an open end formed along the valve seat. On one side of the movement direction of the thermoelectric element in the inner peripheral wall of the outlet-side pipe, an inclined surface is formed such that it slopes toward one side as the outlet side approaches the receiving chamber. The chamber-side end of the inclined surface is located within the range from the valve seat towards one side and is connected to the peripheral wall of the annular groove.

2. The constant temperature device according to claim 1, characterized in that, The outer casing is configured with a housing and an inlet engaged with the housing, the annular protrusion being disposed at the inlet in such a way that it protrudes into the housing, and the annular groove being formed between the outer circumferential surface of the annular protrusion and the inner circumferential surface of the housing.

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