Thermosensitive element

Abstract

The utility model provides a thermosensitive element which comprises a shell, a temperature sensing medium, a guide body and an integrated push rod, the integrated push rod comprises a movable rod and a diaphragm, the diaphragm comprises a sealing part and a contact part, the guide body is sequentially provided with a relative sliding surface, a sector ring surface and a sealing surface along the axial direction of the guide body, and the movable rod slides relative to the relative sliding surface. The sealing portion is clamped between the shell and the sealing face, a sensitivity control cavity is formed between the sector ring face and the side portion of the contact portion, and the temperature sensing medium is sealed in a containing cavity formed between the shell and the bottom of the contact portion. The glue injection part is arranged on a central shaft of the contact part, and the central shaft is collinear with the axial direction of the guide body. The utility model has the characteristics of high stability and small temperature drift.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control, in particular to a thermal sensitive element. Background Art

[0002] Thermistors are commonly used in temperature control devices in the bathroom industry to respond to temperature changes to adjust water supply.

[0003] The Chinese utility model application with application number 202322670412.3 describes a thermistor, which improves the temperature sensitivity of the thermistor by forming a sensitivity control cavity between the contact portion of the diaphragm and the fan ring surface. However, in terms of stability, the thermistor needs to be further improved. Utility Model Content

[0004] The utility model aims to provide a thermal sensitive element with higher stability.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a thermistor, including a shell, a temperature-sensitive medium, a guide body and an integrated push rod, the integrated push rod includes a movable rod and a diaphragm, the diaphragm includes a sealing part and a contact part, the guide body is provided with a relative sliding surface, a fan ring surface and a sealing surface in sequence along the axial direction of the guide body, the movable rod slides relative to the relative sliding surface, the sealing part is clamped between the shell and the sealing surface, a sensitivity control cavity is formed between the fan ring surface and the side of the contact part, the temperature-sensitive medium is sealed in a accommodating cavity formed between the shell and the bottom of the contact part, and is characterized in that: the bottom of the contact part includes a glue injection part based on the bottom convexity, the contact part is rotationally symmetrically arranged with the central axis of the contact part, the glue injection part is arranged on the central axis of the contact part, and the central axis is collinear with the axial direction of the guide body.

[0006] It can be seen from the above scheme that, since the glue injection part is arranged based on the bottom convexity of the contact part and is arranged on the central axis of the contact part, compared with thermistors with the glue injection part arranged at other positions, the rubber distribution in the diaphragm is more uniform and the performance of the thermosensitive element is more stable.

[0007] A further solution is that the glue injection portion is a columnar structure.

[0008] A further solution is that the glue injection portion is an arc-shaped convex structure, and the convex part of the arc-shaped convex structure faces the temperature sensing medium.

[0009] A further solution is that the glue injection portion includes a columnar structure and an arc-shaped convex structure, the convex portion of the arc-shaped convex structure faces the temperature sensing medium, and the base of the columnar structure is connected to the convex portion of the arc-shaped convex structure.

[0010] It can be seen that the glue injection portion disposed on the central axis of the contact portion can be a variety of structures and combinations thereof.

[0011] A further solution is that the bottom of the contact portion includes an annular groove, the annular groove is arranged around the glue injection portion, and the glue injection portion is arranged at the inner ring of the annular groove.

[0012] It can be seen that the temperature drift of the thermistor can be reduced and the life of the thermistor can be increased by setting the annular groove.

[0013] A further solution is that the bottom of the annular groove and the bottom of the glue injection portion are collinear.

[0014] A further solution is that the contact portion further includes a connecting portion, which is fixedly connected to the movable rod and abuts against the relative sliding surface.

[0015] It can be seen from this that the connection strength between the diaphragm and the movable rod can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an embodiment of the utility model.

[0017] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0018] Figure 3 It is a cross-sectional view of a guide body according to an embodiment of the utility model.

[0019] Figure 4 It is a cross-sectional view of the diaphragm of the embodiment of the utility model.

[0020] Figure 5 It is a displacement data diagram of the movable rod of the embodiment of the utility model when the cold water supply and the hot water supply are lost.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0022] See also Figures 1 to 4 The thermosensitive element of this embodiment includes a housing 1, a temperature sensing medium 2, a guide body 3 and an integrated push rod 4. In the axial direction of the guide body 3, the guide body 3 is sequentially provided with an inner end surface 31, a sealing surface 32, a fan ring surface 33, a relative sliding surface 34 and an outer end surface 35. The integrated push rod 4 includes a movable rod 41 and a diaphragm 42.

[0023] In the integrated push rod 4, the diaphragm 42 includes a sealing portion 421, a contact portion 422 and a connecting portion 423. The sealing portion 421 is sandwiched between the housing 1 and the sealing surface 32, and the housing 1 and the sealing surface 32 are tightly connected.

[0024] A sensitivity control chamber 101 is formed between the sector ring surface 33 and the side portion 4221 of the contact portion. The temperature-sensing medium 2 is sealed in the accommodating chamber 102 formed between the housing 1 and the bottom 4222 of the contact portion, and the bottom 4222 of the contact portion is in direct contact with the temperature-sensing medium 2. The connecting portion 423 is fixedly connected to the end of the movable rod 41 and abuts against the relative sliding surface 34. The movable rod 41 slides relative to the relative sliding surface 34, and the head end of the movable rod 41 can move out of or into the outer end surface 35 along the axial direction of the movable rod 41. The head end of the movable rod 41 is the end of the movable rod 41 away from the contact portion 422, and the end end of the movable rod 41 is the end of the movable rod 41 close to the contact portion 422.

[0025] The diaphragm 42 and the contact portion 422 are both symmetrical structures. The bottom 4222 of the contact portion also includes a glue injection portion 401 and an annular groove 402. The contact portion 422 is arranged rotationally symmetrically with respect to the central axis of the contact portion 422. The glue injection portion 401 is convexly arranged based on the bottom 4222 of the contact portion and is located on the central axis of the contact portion 422. The central axis is colinear with the axial direction of the guide body 3. In this embodiment, the glue injection portion 401 includes an arc-shaped protruding structure 4011 and a columnar structure 4012, wherein the protruding portion of the arc-shaped protruding structure 4011 faces the temperature-sensing medium 2, and the base of the columnar structure 4012 is connected to the protruding portion of the arc-shaped protruding structure 4011. The base of the columnar structure 4012 is the head end of the columnar structure 4012 close to the guide body 3 in the length direction. The annular groove 402 is arranged around the arc-shaped protruding structure 4011 and the columnar structure 4012 , and the arc-shaped protruding structure 4011 and the columnar structure 4012 are arranged at the inner ring of the annular groove 402 .

[0026] Specifically, during the manufacturing process of the diaphragm 42, rubber is injected at the position of the glue injection part 401, and the glue injection part 401 is formed after the diaphragm 42 is manufactured. Since the contact part 422 is a symmetrical structure, the glue injection part 401 is set on the central axis of the contact part 422, so that the rubber in the diaphragm 42 can be evenly distributed.

[0027] When the temperature of the environment in which the thermistor of this embodiment is located increases, the temperature-sensitive medium 2 expands due to heat and pushes the diaphragm 42 to cause the diaphragm 42 to deform. At this time, the movable rod 41 is displaced away from the guide body 3; when the temperature of the environment in which the thermistor 42 is located decreases, the temperature-sensitive medium 2 contracts to cause the diaphragm 42 to recover from the deformation. At this time, the movable rod 41 is displaced closer to the guide body 3 and returns to its original position.

[0028] When the temperature-sensitive medium 2 expands due to heat and pushes the diaphragm 42 to deform, the contact portion 422 moves toward the fan ring surface 33, the volume of the annular groove 402 increases, and the volume of the sensitivity control cavity 101 decreases; when the temperature-sensitive medium 2 contracts and the diaphragm 42 recovers from the deformation, the contact portion 422 moves away from the fan ring surface 33, the volume of the annular groove 402 decreases, and the volume of the sensitivity control cavity 101 returns to its original size.

[0029] Referring to Table 1, Table 2, and Table 3, Table 1 is the test data of the bidirectional safety project of the embodiment of the utility model. Table 2 is the test data of the pressure change project of the embodiment of the utility model. Table 3 is the test data of the temperature change project of the embodiment of the utility model.

[0030] Table 1. Bidirectional security project test data

[0031]

[0032] Table 2. Pressure change project test data

[0033]

[0034] Table 3. Temperature change project test data

[0035]

[0036]

[0037] The test data of the thermistor of this embodiment under the items of bidirectional safety, pressure change and temperature change well meet the test requirements of QB / T2806-2017.

[0038] Refer to Table 4 and Figure 5 Table 4 shows the time taken for the outlet water temperature to be restored to the value before the cold water supply is lost and the average value of the time when the thermistor of this embodiment is used in bathroom equipment, when the hot water temperature is 65°C and the cold water temperature is 16°C, and the time taken for the outlet water temperature to be restored to the value before the hot water supply is lost and the average value of the time when the hot water supply is lost. Figure 5 The figure shows the displacement of the movable rod when the temperature of the thermistor rises and falls in this process. When the cold water supply is lost, the temperature of the thermistor rises and the displacement of the movable rod increases. When the hot water supply is lost, the temperature of the thermistor falls and the displacement of the movable rod decreases.

[0039] Table 4. Data graph of the time taken to stabilize the outlet water temperature under cold water supply failure and hot water supply failure

[0040]

[0041] Referring to Table 5, Table 5 shows the service life test record of the thermistor of this embodiment. The temperature drift does not exceed 2° C. after more than 50,000 tests.

[0042] Table 5. Service life test data

[0043]

[0044]

[0045] In summary, thermistors have the characteristics of long life, high stability and small temperature drift.

Claims

1. A thermal element, comprising a housing, a temperature-sensitive medium, a guide body and an integrated push rod, wherein the integrated push rod comprises a movable rod and a diaphragm, wherein the diaphragm comprises a sealing portion and a contact portion, wherein the guide body is provided with a relative sliding surface, a sector ring surface and a sealing surface in sequence along the axial direction of the guide body, wherein the movable rod slides relative to the relative sliding surface, wherein the sealing portion is clamped between the housing and the sealing surface, wherein a sensitivity control cavity is formed between the sector ring surface and the side of the contact portion, wherein the temperature-sensitive medium is sealed in a receiving cavity formed between the housing and the bottom of the contact portion, wherein: The bottom of the contact portion includes a glue injection portion convex based on the bottom, the contact portion is rotationally symmetrically arranged about the central axis of the contact portion, the glue injection portion is arranged on the central axis of the contact portion, and the central axis is colinear with the axial direction of the guide body.

2. The thermal element according to claim 1, characterized in that: The glue injection part is a columnar structure.

3. The thermal element according to claim 1, characterized in that: The glue injection portion is an arc-shaped convex structure, and the convex part of the arc-shaped convex structure faces the temperature sensing medium.

4. The thermal element according to claim 1, characterized in that: The glue injection part includes a columnar structure and an arc-shaped convex structure, the convex part of the arc-shaped convex structure faces the temperature sensing medium, and the base of the columnar structure is connected to the convex part of the arc-shaped convex structure.

5. The thermal element according to any one of claims 1 to 4, characterized in that: The bottom of the contact portion comprises an annular groove, the annular groove is arranged around the glue injection portion, and the glue injection portion is arranged at the inner ring of the annular groove.

6. The thermal element according to claim 5, characterized in that: The bottom of the annular groove and the bottom of the glue injection portion are collinear.

7. The thermal element according to claim 6, characterized in that: The contact portion further includes a connecting portion, which is fixedly connected to the movable rod and abuts against the relative sliding surface.

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