Thermostatic device and method for manufacturing the same

Abstract

The present application provides a thermostat and a manufacturing method thereof, which can easily assemble shell members constituting a shell and reduce manufacturing cost. The thermostat comprises a shell (1), a thermoelectric element (17) moving in an axial direction in response to the temperature of a cooling liquid, a valve body (15) opening and closing a communication part of a first flow passage (21) and a second flow passage (7) by moving away from and approaching a valve seat (20b) provided inside the shell in response to the movement of the thermoelectric element, and a force applying member (16) applying force to the valve body to the valve seat side. The shell comprises a first shell member (2) having a main body (20), the first flow passage and the second flow passage, and a second shell member (3) fastened to the first shell member by rotating in a circumferential direction of the first shell member and having a third flow passage (22).

Description

Technical Field

[0001] This invention relates to a thermostatic device and a method for manufacturing the same, specifically a thermostatic device and a method for manufacturing the same that allows for easy assembly of the shell components and reduces manufacturing costs. Background Technology

[0002] A thermostat is installed, for example, on the inlet or outlet side of the coolant flow path of an automotive engine, to circulate coolant through the radiator to the engine in accordance with the temperature of the coolant cooling the engine, to circulate coolant bypassing the radiator to the engine, and to control the temperature of the coolant circulating at the engine.

[0003] However, regarding the construction of the shell that forms the outer contour of the thermostat, for example, as disclosed in Patent Document 1 (see...) Figure 5 The component 51 (first housing component), which includes a radiator side pipe 51a communicating with the radiator, and the component 52 (second housing component), which includes a bypass side pipe 52a communicating with a bypass flow path bypassing the radiator, are formed separately and are joined together, for example, by means of laser welding. Alternatively, they may be joined by bolts, for example, as disclosed in Patent Document 2.

[0004] In this way, when multiple shell components formed separately are joined together to form an integrated shell, it is necessary to seal the interior of the shell components after they are joined together to house thermoelectric elements (temperature sensing parts), valve bodies, and helical springs that apply force to the valve bodies.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2006-342767.

[0006] Patent document 2: Japanese Patent Application Publication No. 07-301362.

[0007] However, when multiple shell components are joined together by welding, welding equipment such as vibration welding devices is required, which increases costs.

[0008] Furthermore, when multiple shell components are bolted together, a process is required to press a sleeve (a metal tube) into the bolt insertion hole, which increases the number of parts and processes, leading to higher costs. Summary of the Invention

[0009] The present invention is made with regard to the foregoing aspects, and its object is to provide a thermostatic device and a method thereof that enable easy assembly of shell components constituting the shell and reduce manufacturing costs.

[0010] To solve the aforementioned problems, the thermostatic device of the present invention is disposed at the connection between the cooling flow path and the bypass flow path. The cooling flow path circulates coolant from the radiator to the engine, and the bypass flow path is connected to the cooling flow path to circulate coolant bypassing the radiator to the engine. The thermostatic device is characterized in that it includes a housing, a thermoelectric element, a valve body, and a force-applying component. The housing has a main body, a first flow port, a second flow port, and a third flow port. The main body is cylindrical and has an inner chamber. The first flow port connects the radiator side of the cooling flow path to the inner chamber, and the second flow port connects the engine side of the cooling flow path to the inner chamber. The 3rd flow port connects the aforementioned bypass flow path and the aforementioned receiving chamber. The aforementioned thermoelectric element is housed in the aforementioned receiving chamber and moves axially within the aforementioned main body in accordance with the temperature of the coolant. The aforementioned valve body, through the movement of the aforementioned thermoelectric element, moves away from and closer to the valve seat provided inside the aforementioned housing, opening and closing the connection between the aforementioned first flow port and the aforementioned second flow port. The aforementioned force-applying component applies force to the aforementioned valve body towards the valve seat side. The aforementioned housing includes a first housing component and a second housing component. The aforementioned first housing component has the aforementioned main body, the aforementioned first flow port, and the aforementioned second flow port. The aforementioned second housing component is fastened to the aforementioned first housing component by circumferential rotation relative to the aforementioned first housing component and has the aforementioned third flow port.

[0011] In addition, preferably, the fastening connection between the first shell component and the second shell component is a bayonet structure, wherein the bayonet structure is configured such that a plurality of claws formed on one of the first shell component and the second shell component engage with a plurality of locking portions formed on the other corresponding to the plurality of claws.

[0012] Furthermore, preferably, the aforementioned second housing component has a bypass side tube forming the aforementioned third flow port on its inner side, the bypass side tube being configured such that its center is located on the rotation axis when the aforementioned first housing component and the aforementioned second housing component are fastened together by circumferential relative rotation.

[0013] Furthermore, preferably, the aforementioned second housing component has a bypass side tube, an element holding part, and a spring seat. The aforementioned bypass side tube forms the aforementioned third flow port on its inner side. The aforementioned element holding part is cylindrical. The aforementioned thermoelectric element is inserted into the inner side of the aforementioned element holding part in a way that allows it to move axially. The aforementioned spring seat supports the aforementioned force-applying component. The aforementioned bypass side tube, the aforementioned element holding part, and the aforementioned spring seat are integrally formed.

[0014] Furthermore, preferably, the aforementioned element holding portion has a cylindrical portion protruding into the aforementioned receiving chamber. In the aforementioned cylindrical portion, a groove along the axial direction is formed on the inner circumference of the cylindrical portion, and a transverse hole with an opening is formed in the aforementioned groove. A first flow path connecting the aforementioned bypass flow path and the aforementioned receiving chamber is formed by means of the aforementioned groove, and a second flow path connecting the aforementioned bypass flow path and the aforementioned receiving chamber is formed by means of the aforementioned transverse hole.

[0015] Furthermore, preferably, the aforementioned force-applying component is located on the valve seat side in the direction of movement of the aforementioned thermoelectric element, compared to the aforementioned transverse hole.

[0016] With this structure, the second housing component, which has a bypass side flow port, can be easily fastened to the first housing component by circumferential rotation relative to the first housing component. Therefore, compared with bolted connections or welding connections, the cost and time required can be significantly reduced.

[0017] Furthermore, in order to solve the aforementioned problems, the method for manufacturing the constant temperature device of the present invention is characterized by comprising a first step and a second step. In the first step, the housing unit is housed in one of a first housing component and a second housing component. The first housing component has a first flow port for coolant flow, and the second housing component has a second flow port for coolant flow. In the second step, the first housing component and the second housing component are fastened together by circumferential relative rotation.

[0018] According to this method, the first housing component with a radiator-side flow port and the second housing component with a bypass-side flow port are easily fastened together by circumferential relative rotation (preferably by a bayonet). Therefore, compared with bolted connections or welding connections, the cost and time required can be significantly reduced.

[0019] Invention Effects

[0020] According to the present invention, a constant temperature device and a method thereof can be provided, which can easily assemble the shell components constituting the shell with each other, thereby reducing the manufacturing cost. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the temperature control device of the present invention.

[0022] Figure 2 (a) is a three-dimensional view of the secondary shell. Figure 2 (b) is a bottom view of the secondary shell.

[0023] Figure 3 This is a perspective view taken from below before the installation of the main and secondary shells.

[0024] Figure 4 This is a bottom view of the shell.

[0025] Figure 5 This is a side view of a conventional temperature control device. Detailed Implementation

[0026] Hereinafter, embodiments of the constant temperature device of the present invention will be described based on the accompanying drawings. Figure 1 This is a cross-sectional view of the temperature control device of the present invention.

[0027] Figure 1 The thermostat 10 shown is installed, for example, in the engine's coolant system. Specifically, the thermostat 10 is disposed at the connection between the cooling flow path and the bypass flow path. The cooling flow path circulates coolant from the radiator to the engine, and the bypass flow path is connected to the cooling flow path to circulate coolant bypassing the radiator to the engine. By adjusting the flow rate of coolant flowing in the cooling flow path and the bypass flow path, the temperature of the coolant circulating in the engine is controlled.

[0028] The aforementioned thermostat 10 includes a thermostat housing 1 (hereinafter referred to as housing 1), a thermoelectric element 17 (temperature sensing part), and a piston 18. The thermostat housing 1 has a main body 20, which is cylindrical and has an inner chamber 20a. The thermoelectric element 17 (temperature sensing part) is movable within the main body 20 and is accommodated therein. The piston 18 is retractable and can be inserted into the thermoelectric element 17. Hereinafter, for ease of explanation, [the following will be referred to as...]. Figure 1 The upper and lower parts of the thermostatic device 10 shown are referred to as "upper" and "lower".

[0029] A main valve body 15 is provided in the upper part of the axial direction of the thermoelectric element 17. This main valve body 15 is capable of disengaging from and repositioning relative to the annular valve seat 20b formed on the inner peripheral wall of the housing 1. Furthermore, the thermostatic device 10 includes a helical spring 16 as a force-applying component that applies force to the valve seat 20b by the aforementioned main valve body 15. The helical spring 16 is arranged to surround the thermoelectric element 17. In addition, a thermally expanding body such as wax is sealed inside the aforementioned thermoelectric element 17, and the end of the aforementioned piston 18 is arranged to face the thermally expanding body.

[0030] Furthermore, when the coolant surrounding the thermoelectric element 17 reaches a high temperature and the thermal expansion body is heated and expands, the piston 18 retracts from the thermoelectric element 17. The upper end of the piston 18 is fitted into the cylindrical retaining portion 20c formed in the housing 1, restricting its upward movement relative to the housing 1. Therefore, the piston 18 retracts from the thermoelectric element 17 as it moves downward against the force of the coil spring 16. At this time, the main valve body 15 moves downward together with the thermoelectric element 17, leaving the valve seat 20b.

[0031] On the other hand, when the coolant around the thermoelectric element 17 is at a low temperature and the thermal expansion body is cooled and thus contracts, the thermoelectric element 17 moves upward due to the force of the coil spring 16, and the piston 18 penetrates into the thermoelectric element 17. At this time, the main valve body 15 moves upward together with the thermoelectric element 17, approaching the valve seat 20b.

[0032] The components such as the aforementioned piston 18, thermoelectric element 17, main valve body 15, and coil spring 16, which are housed inside the shell 1 in the temperature control device 10, are collectively referred to as the housed unit. The shell 1 has a cylindrical main body 20 that opens downward to accommodate the housed unit, a main shell 2 (first shell component) with a radiator side pipe 5, and a secondary shell 3 (second shell component) that is disposed below the thermoelectric element 17 and has a bypass side pipe 6, in a manner that seals the lower end opening 2a of the main body 20.

[0033] The inner side of the radiator side pipe 5 has a first flow port 21, which serves as the coolant inlet to the housing 20a. In the aforementioned main housing 2, in addition to the first flow port 21, a second flow port 7 is formed. The second flow port 7 opens towards the side of the thermoelectric element 17 and serves as the coolant outlet for the coolant from the housing 20a. The first flow port 21 and the second flow port 7 are respectively connected to the cooling flow path connecting the engine and the radiator. Coolant from the radiator flows through the first flow port 21, the housing 20a, and the second flow port 7 to the engine. Thus, the first flow port 21 connects the radiator side of the cooling flow path to the housing 20a, and the second flow port 7 connects the engine side of the cooling flow path to the housing 20a.

[0034] Furthermore, as previously described, when the thermoelectric element 17 is heated and the main valve body 15 moves away from the valve seat 20b, the flow rate of coolant from the first flow port 21 to the second flow port 7 increases. Conversely, when the thermoelectric element 17 is cooled and the main valve body 15 approaches the valve seat 20b, the flow rate of coolant from the first flow port 21 to the second flow port 7 decreases. In this way, the main valve body 15 moves away from and approaches the valve seat 20b, thereby opening and closing the connection between the first flow port 21 and the second flow port 7.

[0035] Figure 2 (a) is a three-dimensional view of the secondary shell 3. Figure 2 (b) is a bottom view of the sub-shell 3. As previously described, the sub-shell 3 has a bypass side pipe 6. The inside of the bypass side pipe 6 is a third flow port 22 that serves as a coolant inlet toward the receiving chamber 20a. In addition to the bypass side pipe 6, the sub-shell 3 also has an element holding portion 3a that can slide to the ground to hold the aforementioned thermoelectric element 17, an annular cover portion 3d that seals between the outer periphery of the element holding portion 3a and the lower end of the main body portion 20, and a spring seat 3b formed around the element holding portion 3a, which is located above the cover portion 3d, to support the lower end of the coil spring 16.

[0036] The aforementioned cover portion 3d is formed to extend outward from the outer periphery of the component holding portion 3a and from the axial center portion. The aforementioned component holding portion 3a is cylindrical, and its inner side communicates with the inner side (third flow port 22) of the bypass side pipe 6. If the portion of the component holding portion 3a that is higher than the cover portion 3d is designated as a cylindrical portion 3a2, then the cylindrical portion 3a2 protrudes into the receiving chamber 20a. A plurality of grooves are formed axially along the inner periphery of the cylindrical portion 3a2, and ribs 3a1 are formed between adjacent grooves. The ribs 3a1 are evenly spaced in the circumferential direction of the cylindrical portion 3a2.

[0037] The thermoelectric element 17 can be slidably inserted into the inner side of the circumferentially arranged ribs 3a1. The end face of the thermoelectric element 17 side of the rib 3a1 is coplanar with the inner circumferential surface of the portion of the element holding part 3a that is lower than the cover part 3d (the portion without a groove). When the thermoelectric element 17 enters this portion, the third flow port 22 is blocked, and the communication between the receiving chamber 20a and the bypass flow path is cut off. Thus, in this embodiment, the thermoelectric element 17 functions as a secondary valve body for opening and closing the bypass flow path.

[0038] On the other hand, when the lower end of the thermoelectric element 17 is located in the middle of the cylindrical portion 3a2 (the portion with the groove), the coolant in the bypass flow path flows into the receiving chamber 20a through the gap formed between the cylindrical portion 3a2 and the thermoelectric element 17 via the groove. Thus, on the inner circumference side of the cylindrical portion 3a2, a first flow path L1 is formed connecting the bypass flow path and the receiving chamber 20a via the gap formed between adjacent ribs 3a1 (grooves). As a result, when the coolant flows from the bypass flow path through the first flow path L1 into the receiving chamber 20a, it contacts the outer circumference side of the thermoelectric element 17, thus increasing the temperature sensitivity of the thermoelectric element 17 relative to the temperature of the coolant flowing through the bypass flow path.

[0039] In addition, such as Figure 2 As shown in (a), the aforementioned plurality of ribs 3a1 are connected to a plurality of columns 3g positioned circumferentially below the aforementioned cylindrical portion 3a2. The aforementioned spring seat 3b is raised relative to the cover portion 3d due to the aforementioned plurality of columns 3g. Between the spring seat 3b and the cover portion 3d, a transverse hole 3h is formed between adjacent columns 3g, connecting the inside and outside of the aforementioned cylindrical portion 3a2. This transverse hole 3h opens between adjacent ribs 3a1. Thus, when the lower end of the thermoelectric element 17 is in the middle of the cylindrical portion 3a2 (the portion with the groove), the coolant in the bypass flow path flows into the receiving chamber 20a through the transverse hole 3h, in addition to the first flow path L1. In this way, a second flow path L2 connecting the bypass flow path and the receiving chamber 20a is formed by means of the transverse hole 3h. This ensures a sufficient flow rate of coolant flowing in the bypass flow path.

[0040] Furthermore, the helical spring 16 is located above the transverse hole 3h (the second flow path L2) (on the valve seat 20b side in the direction of movement of the thermoelectric element 17), so that the flow of coolant through the second flow path L2 is prevented from being affected by the helical spring 16 and resulting in a large pressure loss, and sufficient flow of coolant in the bypass flow path can be reliably ensured.

[0041] In this way, at the sub-shell 3, the component holding part 3a, the spring seat 3b, and the bypass side tube 6 are integrally formed as a single component, for example, by injection molding. This reduces the number of parts required for the temperature control device and shortens assembly time. Furthermore, it suppresses the wobbling of the component holding part 3a and the spring seat 3b, improving the durability of the parts.

[0042] Next, the installation structure of the main shell 2 and the secondary shell 3 will be explained. For example... Figure 2 As shown in (a) and (b), the subshell 3 has an annular cover 3d, and on its periphery, a plurality of claws 3d1 (four in the figure) protrude radially outward at equal intervals.

[0043] On the other hand, as from Figure 3 As shown in the perspective view from below, a locking portion 2b is formed on the lower inner circumference of the main shell 2, corresponding to each of the aforementioned claw portions 3d1, where the claw portions 3d1 can lock. Locking refers to mutual engagement and fixation, meaning the claw portions 3d1 are fixed in a state of being engaged with the locking portion 2b. The locking portion 2b has the aforementioned insertion path 2b1 for the claw portions 3d1 and a locking piece 262. That is, by inserting the sub-shell 3 into the lower opening 2a of the main shell 2, the claw portions 3d1 are embedded in the insertion path 2b1. Figure 3 (The arrow is indicated by the reference numeral S1 in the attached figure).

[0044] Next, relative to the main shell 2, the secondary shell 3 is rotated slightly in the forward direction (twisted), thereby causing the claw 3d1 to engage with the locking piece 2b2. Figure 3 (As indicated by the arrow in the attached diagram S2), the main shell 2 and the secondary shell 3 are fitted together (based on a bayonet-style fastening structure).

[0045] Furthermore, around the periphery of the cover portion 3d of the secondary shell 3, such as Figure 2 As shown in (b), multiple notched recesses 3f are formed. On the other hand, as... Figure 3 As shown, a through hole 2c is formed in the lower part of the main shell 2. With the secondary shell 3 fitted relative to the main shell 2, the through hole 2c is positioned opposite to one of the aforementioned cut recesses 3f, as shown below. Figure 3 The pin 4 is inserted as shown, thereby preventing the sub-shell 3 from rotating in either direction, and the installation is complete. Figure 3 (The arrow shown by reference numeral S3 in the attached figure).

[0046] In this way, the main shell 2 with radiator side tube 5 and the secondary shell 3 with bypass side tube 6 can be easily fastened together by circumferential relative rotation without the use of bolts or welding, which can reduce the cost and time spent.

[0047] Furthermore, the axis center of the aforementioned bypass side pipe 6 is provided on the rotational axis of the rotational center when the main housing 2 and the sub-housing 3 are rotated and fastened together. Therefore, the circumferential insertion position of the sub-housing 3 relative to the lower opening 2a of the main housing 2 is not important. That is, regardless of the circumferential insertion position, the position of the bypass side pipe 6 relative to the radiator side pipe 5 or the position of the bypass side pipe 6 relative to the engine side flow path 7 remains unchanged. In addition, the configuration is such that, regardless of the circumferential insertion position of the sub-housing 3 relative to the lower opening 2a of the main housing 2, a certain position of the plurality of cut recesses 3f must coincide with the position of the through hole 2c of the main housing 2.

[0048] In addition, such as Figure 1 As shown, an O-ring 8, serving as a sealing component, is provided on the upper side of the aforementioned plurality of claw portions 3d1 to liquid-tightly seal the fastening connection between the main housing 2 and the secondary housing 3. Thus, the claw portions 3d1 are positioned further outward than the O-ring 8, preventing them from being immersed in coolant, which is advantageous in terms of durability.

[0049] Furthermore, as mentioned above, the main shell 2 and the secondary shell 3 are joined by the engagement of the claw 3d1 and the locking part 2b. The rotation of the secondary shell 3 during this fastening connection is only a small amount (the degree of twisting), which can minimize the torsion of the O-ring 8 and the coil spring 16.

[0050] In addition, such as Figure 3 , Figure 4 ( Figure 4 As shown in the bottom view of shell 1, on the back side of sub-shell 3, multiple ribs 9 (four in the figure) are formed radially and equally spaced outward from the periphery of bypass side tube 6. In this way, by setting the ribs 9, when the sub-shell 3 is rotated and fastened relative to the main shell 2, the tool can be hooked onto the aforementioned ribs 9 to rotate, and the fastening operation can be performed without gripping the bypass side tube 6.

[0051] When manufacturing a thermostat 10 with such a housing 1, the main valve body 15, the helical spring 16, the piston 18, the thermoelectric element 17, and other housing units are appropriately housed into the main body 20 through the lower opening 2a of the main housing 2.

[0052] Next, as described above, the secondary housing 3 is inserted into the lower opening 2a of the main housing 2. At this time, the lower part of the thermoelectric element 17 is held in place by the element holding part 3a. Furthermore, at this time, the claw part 3d1 is inserted into the insertion path 2b1.

[0053] Next, the tool is attached to the rib 9 formed on the back of the sub-shell 3. Using the tool, the sub-shell 3 is rotated slightly in the forward direction relative to the main shell 2. As a result, the claw 3d1 engages with the locking piece 2b2, and the main shell 2 and the sub-shell 3 are fitted together and securely connected.

[0054] Finally, the sub-shell 3 is fixed in the circumferential direction by inserting the pin 4 into the lateral cut recess 3f formed in the through hole 2c on the lower side of the main shell 2, thus completing the installation.

[0055] As described above, according to an embodiment of the present invention, the main housing 2 having the radiator side tube 5 and the secondary housing 3 having the bypass side tube 6 are easily fastened together by the engagement of multiple claw portions 3d1 and locking portions 2b (a fastening connection structure based on a bayonet method). Therefore, compared with fastening connections using bolts or welding, the cost and time required can be significantly reduced.

[0056] Furthermore, the thermostat of the present invention is not limited to the embodiment shown in the figure, and can be widely applied to thermostats that utilize a housing component having a radiator side pipe and a housing component having a bypass side pipe that are fastened together. For example, in this embodiment, the thermostat is disposed on the inlet side of the engine, with a first flow port being a first inlet for coolant flowing in from the radiator, a second flow port being an outlet for coolant flowing to the engine side, and a third flow port being a second inlet for coolant flowing in from the bypass flow path. However, it is also possible for the thermostat to be disposed on the outlet side of the engine, with a first flow port being a first outlet for coolant flowing to the radiator side, a second flow port being an inlet for coolant flowing in from the engine, and a third flow port being a second outlet for coolant flowing to the bypass flow path side.

[0057] Furthermore, in the aforementioned embodiment, the main shell 2 with the radiator side tube 5 and the sub-shell 3 with the bypass side tube 6 are fastened together by a snap-fit ​​method (rotating relative to each other in the circumferential direction). However, the present invention is not limited to the snap-fit ​​method, as long as the main shell 2 and the sub-shell 3 are fastened together by relative rotation (for example, the male thread portion formed on one and the female thread portion formed on the other are fastened together by thread engagement).

[0058] Furthermore, in the aforementioned embodiments, the secondary shell 3 is fixed relative to the main shell 2 in the circumferential direction by means of pin 4, but the method of circumferential fixing is not limited to pin 4 and can be appropriately changed.

[0059] Explanation of reference numerals in the attached figures

[0060] 1. Thermostat housing (referred to as housing)

[0061] 2. Main Shell (First Shell Component)

[0062] 2b locking part

[0063] 3 secondary shells (second shell component)

[0064] 3a Component holding section (temperature sensing section holding section)

[0065] 3a1 rib

[0066] 3a2 cylindrical section

[0067] 3b spring seat

[0068] 3d1 Claw

[0069] 5 Radiator side tubes

[0070] 6 Bypass side pipe

[0071] 7. Engine side flow path (second flow port)

[0072] 10. Thermostatic device

[0073] 15. Main valve body (valve body)

[0074] 16 coil spring

[0075] 20 main body sections

[0076] 20a containment section

[0077] 20b valve seat

[0078] 21st Circulation Port

[0079] 22 Third circulation port.

Claims

1. A thermostatic device disposed at the connection between a cooling flow path and a bypass flow path, wherein the cooling flow path circulates coolant from the radiator to the engine, and the bypass flow path is connected to the cooling flow path to circulate coolant bypassing the radiator to the engine, characterized in that... The aforementioned temperature control device includes a shell, thermoelectric elements, a valve body, and force-applying components. The aforementioned shell has a main body, a first flow port, a second flow port, and a third flow port. The aforementioned main body is cylindrical, forming an inner chamber. The aforementioned first flow port connects the radiator side of the aforementioned cooling flow path and the aforementioned receiving chamber. The aforementioned second flow port connects the engine side of the aforementioned cooling flow path and the aforementioned housing chamber. The aforementioned third flow port connects the aforementioned bypass flow path and the aforementioned receiving chamber. The aforementioned thermoelectric element is housed in the aforementioned receiving chamber and moves axially within the aforementioned main body in accordance with the temperature of the coolant. The valve body, through the movement of the aforementioned thermoelectric element, moves away from and closer to the valve seat disposed inside the aforementioned housing, thereby opening and closing the connecting portion between the aforementioned first flow port and the aforementioned second flow port. The aforementioned force-applying component applies force to the valve body towards the valve seat side. The aforementioned shell comprises a first shell component and a second shell component. The aforementioned first shell component has the aforementioned main body, the aforementioned first flow port, and the aforementioned second flow port. The aforementioned second shell component is securely connected to the aforementioned first shell component by circumferential rotation relative to the aforementioned first shell component, and has the aforementioned third flow port. The aforementioned second housing component includes a bypass side tube, a component holding part, and a spring seat. The bypass side pipe forms the aforementioned third flow port on its inner side. The element holding part is cylindrical, and the aforementioned thermoelectric element is axially movable and inserted into the inner side of the aforementioned element holding part. The spring seat supports the aforementioned force-applying component. The aforementioned bypass side tube, the aforementioned component holding part, and the aforementioned spring seat are integrally formed. The aforementioned component holding portion has a cylindrical portion protruding into the aforementioned receiving chamber. In the aforementioned cylindrical portion, an axial groove is formed on the inner circumference of the cylindrical portion, and an open transverse hole is formed in the aforementioned groove. The aforementioned groove forms a first flow path that connects the aforementioned bypass flow path and the aforementioned receiving chamber. A second flow path is formed by means of the aforementioned transverse hole, which connects the aforementioned bypass flow path and the aforementioned receiving chamber.

2. The constant temperature device as described in claim 1, characterized in that, The fastening connection between the aforementioned first shell component and the aforementioned second shell component is a bayonet structure. The bayonet structure is configured such that a plurality of claws formed on one of the aforementioned first shell component and the aforementioned second shell component engage with a plurality of locking portions formed on the other shell component corresponding to the plurality of claws.

3. The constant temperature device as described in claim 1 or 2, characterized in that, The aforementioned bypass side tube is configured such that its center is located on the rotation axis on which the aforementioned first housing component and the aforementioned second housing component are fastened together by circumferential relative rotation.

4. The constant temperature device as described in claim 1, characterized in that, The aforementioned force-applying component is located on the valve seat side in the direction of movement of the aforementioned thermoelectric element, compared to the aforementioned transverse hole.

5. A method for manufacturing a constant temperature device, which is the method for manufacturing a constant temperature device according to any one of claims 1 or 2, characterized in that, It has a first process and a second process. In the aforementioned first step, the unit to be accommodated is accommodated in one of a first shell component and a second shell component, wherein the first shell component has the aforementioned first flow port and the aforementioned second flow port, and the aforementioned second shell component has the aforementioned third flow port. In the aforementioned second process, the first shell component and the second shell component are fastened together by circumferential relative rotation.

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