Diaphragm box for temperature controller

Abstract

The utility model discloses a diaphragm capsule for a temperature controller, which comprises an outer layer diaphragm and an inner layer diaphragm, the inner layer diaphragm is arranged above the outer layer diaphragm, and a space for accommodating a temperature sensing working medium is arranged between the inner layer diaphragm and the outer layer diaphragm; a joint for communicating the capillary tube with the space is arranged in the middle of the outer-layer membrane; wherein the surface of the inner-layer membrane and the surface of the outer-layer membrane are respectively provided with an annular concave layer, and the wall thickness of the concave layer on the inner-layer membrane is smaller than the wall thickness of other positions of the inner-layer membrane. According to the utility model, the pressure generated by the thermal expansion of the temperature sensing medium can be efficiently converted into the directional deformation of the inner-layer diaphragm, especially the thin wall of the lower concave layer, so that the elastic deformation is highly concentrated in the middle of the diaphragm. The centralized deformation mode amplifies the recognizable degree of the temperature signal, and effectively improves the measurement precision. Meanwhile, the integral sealing structure ensures complete transmission of pressure change, avoids response lag caused by medium leakage, and enables the sensor to have a faster dynamic response characteristic.

Description

Technical Field

[0001] This utility model relates to a diaphragm box for a temperature controller, belonging to the field of temperature controller technology. Background Technology

[0002] In the field of temperature sensing technology, traditional diaphragm sensors often face the technical bottleneck of balancing temperature sensing accuracy and dynamic response. On the one hand, existing structures mostly adopt a single-layer uniform thickness diaphragm design, resulting in dispersed deformation distribution of the diaphragm when the temperature-sensing medium expands. This weakens the linear correspondence between deformation signal and temperature change, not only reducing measurement sensitivity but also introducing errors due to irregular deformation in the edge region. On the other hand, in low-temperature environments, the inner diaphragm is prone to central collapse due to material creep or medium contraction, disrupting the uniform contact interface between the temperature-sensing medium and the diaphragm, causing a decrease in long-term stability and further exacerbating the hysteresis of temperature response. Therefore, a diaphragm capsule for temperature controllers is proposed. Utility Model Content

[0003] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a diaphragm box for a temperature controller that amplifies the discernibility of temperature signals and effectively improves measurement accuracy.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a diaphragm box for a temperature controller, comprising:

[0005] Outer membrane;

[0006] An inner diaphragm is disposed above an outer diaphragm, and a space for accommodating a temperature-sensing working medium is provided between the inner and outer diaphragms.

[0007] The connector is located in the middle of the outer membrane and is used to connect the capillary to the space.

[0008] The inner and outer membranes each have an annular recessed layer on their surfaces, and the wall thickness of the recessed layer on the inner membrane is less than the wall thickness at other locations on the inner membrane.

[0009] Preferably, the connector has a connection hole inside, the upper end of the connection hole is connected to the space between the inner diaphragm and the outer diaphragm, and the lower end of the connection hole is provided with a insertion hole for inserting a capillary tube.

[0010] Preferably, the diameter of the insertion hole is larger than the diameter of the connection hole, and a clamping platform is provided at the connection between the insertion hole and the connection hole.

[0011] Preferably, the lower end of the insertion hole is chamfered.

[0012] Preferably, the capillary is fixed inside the insertion hole by a welding process.

[0013] Preferably, a support member is provided inside the space, the support member comprising:

[0014] The lower end plate abuts against the sidewall of the outer diaphragm;

[0015] The upper end plate abuts against the side wall of the inner diaphragm;

[0016] Multiple support columns are evenly distributed between the lower end plate and the upper end plate. The lower end of each support column is fixed to the side wall of the lower end plate, and the upper end of each support column is fixed to the side wall of the upper end plate.

[0017] Preferably, a hollow positioning block is fixedly connected to the lower end plate by a plurality of connecting rods, and the positioning block is connected inside the connecting hole.

[0018] Preferably, grooves are uniformly formed on the lower surface of the lower end plate and the upper surface of the upper end plate.

[0019] Preferably, the outer membrane and the inner membrane are concave.

[0020] Preferably, the outer membrane and the inner membrane are sealed together by a welding process.

[0021] Compared with existing technologies:

[0022] 1. This invention utilizes the pressure energy generated by the thermal expansion of the temperature-sensing medium to efficiently convert it into directional deformation of the inner diaphragm, particularly the thin wall of the concave layer, which concentrates the elastic deformation highly in the center of the diaphragm. This concentrated deformation mode amplifies the discernibility of the temperature signal and effectively improves measurement accuracy. Simultaneously, the overall sealed structure ensures complete transmission of pressure changes, avoiding response lag caused by medium leakage, and giving the sensor faster dynamic response characteristics.

[0023] 2. This utility model improves the overall performance of the temperature sensing device by setting a support structure with double-layer end plates and support columns; the synergistic effect of the support column array and the upper and lower end plates can provide uniform support force to the inner diaphragm in low-temperature environments, effectively preventing the diaphragm from collapsing in the middle due to material fatigue or temperature changes during long-term use, thereby ensuring stable contact between the temperature sensing diaphragm and the medium and improving the accuracy of temperature sensing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0026] Figure 3 This is an exploded view of the outer and inner membrane layers of this utility model.

[0027] Figure 4 This is an overall sectional view of the present invention;

[0028] Figure 5 For the present utility model Figure 4 Enlarged view of point A;

[0029] Figure 6 This is a structural schematic diagram of the lower end plate, upper end plate, and support column of this utility model.

[0030] In the picture:

[0031] 1. Outer membrane; 2. Inner membrane;

[0032] 3. Recessed layer;

[0033] 4. Connector;

[0034] 401. Connecting hole; 402. Insertion hole; 403. Clamping platform;

[0035] 5. Support components;

[0036] 501. Lower end plate; 502. Upper end plate; 503. Support column; 504. Connecting rod; 505. Positioning block; 506. Groove. Detailed Implementation

[0037] The present invention is illustrated below with specific embodiments, but these are not intended to limit the scope of the invention.

[0038] Example 1

[0039] like Figures 1-6 As shown in this embodiment, a diaphragm box for a temperature controller is provided, including an outer diaphragm 1 and an inner diaphragm 2. The inner diaphragm 2 is disposed above the outer diaphragm 1, and a space for accommodating a temperature-sensing working medium is provided between the inner diaphragm 2 and the outer diaphragm 1. A connector 4 for connecting a capillary tube to the space is provided in the middle of the outer diaphragm 1. The surfaces of both the inner diaphragm 2 and the outer diaphragm 1 are provided with annular recessed layers 3. The wall thickness of the recessed layer 3 on the inner diaphragm 2 is smaller than the wall thickness at other locations on the inner diaphragm 2. Except for the thinner wall thickness of the recessed layer 3 on the inner diaphragm 2, the wall thickness at other locations on the inner diaphragm 2 is the same as that of the outer diaphragm 1.

[0040] The outer membrane 1 and the inner membrane 2 are concave.

[0041] The outer membrane 1 and the inner membrane 2 are sealed together by welding.

[0042] Work process:

[0043] When the ambient temperature rises, the temperature-sensing working medium expands due to the overall sealing of the diaphragm box, causing an increase in the cavity pressure between the inner diaphragm 2 and the outer diaphragm 1. The expansion of the temperature-sensing working medium is converted into the deformation of the inner diaphragm 2. Due to the thin-walled design of the recessed layer 3 on the inner diaphragm 2, this area undergoes elastic deformation first, pushing the center of the inner diaphragm 2 to bulge upwards. The temperature change is calculated by measuring the amount of protrusion at the center of the inner diaphragm 2, so as to control the temperature.

[0044] Example 2

[0045] like Figure 2 , Figure 4 and Figure 5 As shown, based on Embodiment 1, in order to enable the space between the inner membrane 2 and the outer membrane 1 to communicate with the capillary, the connector 4 has a connection hole 401 inside. The upper end of the connection hole 401 communicates with the space between the inner membrane 2 and the outer membrane 1, and the lower end of the connection hole 401 has an insertion hole 402 for inserting the capillary.

[0046] The diameter of the insertion hole 402 is larger than the diameter of the connection hole 401, and a clamping platform 403 is provided at the connection between the insertion hole 402 and the connection hole 401.

[0047] The diameter of the insertion hole 402 is matched with the diameter of the capillary tube, and the diameter of the connection hole 401 is matched with the diameter of the capillary tube. When the capillary tube is inserted into the insertion hole 402, the end of the capillary tube abuts against the clamping platform 403, and the capillary tube is installed in place. At this time, the inner hole of the capillary tube is connected to the space between the inner membrane 2 and the outer membrane 1 through the connection hole 401.

[0048] The lower end of the insertion hole 402 is chamfered to facilitate the insertion of the capillary tube into the interior of the insertion hole 402.

[0049] The capillary tube is fixed inside the insertion hole 402 by welding.

[0050] Example 3

[0051] like Figures 4-6 As shown, based on Embodiment 2, in this embodiment, a support member 5 is provided inside the space. The support member 5 includes a lower end plate 501 and an upper end plate 502. The lower end plate 501 abuts against the side wall of the outer membrane 1; the upper end plate 502 abuts against the side wall of the inner membrane 2; a plurality of support columns 503 are evenly distributed between the lower end plate 501 and the upper end plate 502. The lower end of the support column 503 is fixed to the side wall of the lower end plate 501, and the upper end of the support column 503 is fixed to the side wall of the upper end plate 502.

[0052] A hollow positioning block 505 is fixedly connected to the lower end plate 501 by multiple connecting rods 504. The positioning block 505 is connected to the inside of the connecting hole 401. The outer wall of the positioning block 505 is provided with external threads, and the upper end of the connecting hole 401 is provided with internal threads. The positioning block 505 is connected to the inside of the connecting hole 401 by thread engagement.

[0053] Before the outer diaphragm 1 and the inner diaphragm 2 are welded and assembled, the support 5 is first installed on the outer diaphragm 1 using the positioning block 505, and then the connection between the outer diaphragm 1 and the inner diaphragm 2 is made.

[0054] Grooves 506 are evenly provided on the lower surface of the lower end plate 501 and the upper surface of the upper end plate 502. The grooves 506 facilitate the flow of the temperature-sensing working medium in the space.

[0055] At low temperatures, the support member 5 can support the middle part of the inner diaphragm 2, preventing the inner diaphragm 2 from collapsing downwards during long-term use, which helps to improve the accuracy of temperature sensing.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model without departing from the spirit and scope of this utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A diaphragm capsule for a temperature controller, characterized in that, include: Outer membrane (1); An inner diaphragm (2) is disposed above an outer diaphragm (1), and a space for accommodating a temperature-sensing working medium is provided between the inner diaphragm (2) and the outer diaphragm (1); Connector (4) is located in the middle of the outer membrane (1) and is used to connect the capillary to the space; The inner membrane (2) and the outer membrane (1) are both provided with annular recessed layers (3), and the wall thickness of the recessed layer (3) on the inner membrane (2) is less than the wall thickness of other positions of the inner membrane (2).

2. A diaphragm housing for a temperature controller according to claim 1, characterized in that, The connector (4) has a connection hole (401) inside. The upper end of the connection hole (401) is connected to the space between the inner membrane (2) and the outer membrane (1). The lower end of the connection hole (401) is provided with a plug hole (402) for inserting a capillary tube.

3. A diaphragm housing for a temperature controller according to claim 2, characterized in that, The diameter of the insertion hole (402) is larger than that of the connection hole (401), and a clamping platform (403) is provided at the connection between the insertion hole (402) and the connection hole (401).

4. A diaphragm housing for a temperature controller according to claim 2 or 3, characterized in that, The lower end of the insertion hole (402) is chamfered.

5. A diaphragm housing for a temperature controller according to claim 4, characterized in that, The capillary tube is fixed inside the insertion hole (402) by welding.

6. A diaphragm housing for a temperature controller according to claim 2, characterized in that, The space is provided with a support member (5), which includes: The lower end plate (501) abuts against the side wall of the outer diaphragm (1); The upper end plate (502) abuts against the side wall of the inner diaphragm (2); Multiple support columns (503) are evenly distributed between the lower end plate (501) and the upper end plate (502). The lower end of the support column (503) is fixed to the side wall of the lower end plate (501), and the upper end of the support column (503) is fixed to the side wall of the upper end plate (502).

7. A diaphragm housing for a temperature controller according to claim 6, characterized in that, A hollow positioning block (505) is fixedly connected to the lower end plate (501) by a plurality of connecting rods (504), and the positioning block (505) is connected inside the connecting hole (401).

8. A diaphragm housing for a temperature controller according to claim 6 or 7, characterized in that, The lower surface of the lower end plate (501) and the upper surface of the upper end plate (502) are both uniformly provided with grooves (506).

9. A diaphragm housing for a temperature controller according to claim 1, characterized in that, The outer membrane (1) and the inner membrane (2) are concave.

10. A diaphragm housing for a temperature controller according to claim 9, characterized in that, The outer membrane (1) and the inner membrane (2) are sealed together by a welding process.

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