Sensor and heat exchange equipment

Abstract

The invention discloses a sensor and heat exchange equipment, the sensor comprises a base component (1) and a mounting seat (2), sintered glass (3) is mounted in the middle of the mounting seat (2), the base component (1) is provided with a stepped hole (1a), the mounting seat (2) is provided with an annular protruding part (2a), the mounting seat (2) is partially located in the stepped hole (1a), and the annular protruding part (2a) is welded and fixed with an end wall (11) of the stepped hole (1a). The fusion depth range of a welding seam formed after welding in the radial direction of the base component (1) is 1.2 mm-1. 5 mm, and the radial distance between the peripheral face of the annular protruding part (2a) and the peripheral face of the sintered glass (3) in the radial direction of the base component (1) is not smaller than 4.5 mm. According to the sensor, the welding seam depth range of a laser welding part is controlled, the structural strength of a product can be guaranteed, the heat influence of welding on sintered glass can be reduced, and the reliability of the sensor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure detection, and in particular to a sensor and a heat exchange device. Background Art

[0002] As the primary component of the pressure signal acquisition system, the sensor usually includes a base component, a mounting seat, a circuit part and a wiring harness. Its working principle is that the pressure enters from the inlet of the base component. After the mounting seat senses the pressure signal, it converts the fluid pressure signal into an electrical signal through a certain method and transmits it to the circuit part. The circuit part amplifies and temperature compensates the signal, and transmits the voltage signal to the control system through the wiring harness. After being processed by the control system, automatic control is achieved.

[0003] The mounting base is an important part of the signal. It is assembled with the base component by laser welding to ensure airtightness. Compared with the traditional refrigeration system, CO 2 In the fields of refrigerant systems, the main difference is the high pressure range. If the welding strength cannot be guaranteed, the sensor with the above structure will cause poor welding leakage under complex operating conditions, especially when the pressure on the high-pressure side of the system is high and the welding part is subjected to strong pressure load. Summary of the invention

[0004] The purpose of the present invention is to provide a sensor and a heat exchange device to ensure the structural strength of the product after welding, improve the product reliability, and meet the requirements of CO 2 Demand for use in refrigerant systems and other fields.

[0005] In order to solve the above technical problems, the present invention provides a sensor, including a base component and a mounting seat, wherein sintered glass is installed in the middle of the mounting seat, the base component has a step hole, the mounting seat has an annular protrusion, and the mounting seat is partially located inside the step hole. The annular protrusion and the end wall of the step hole are welded and fixed, and the weld formed after welding has a radial penetration range of 1.2mm to 1.5mm along the base component, and the outer peripheral surface of the annular protrusion is at a distance of not less than 4.5mm from the outer peripheral surface of the sintered glass along the radial direction of the base component.

[0006] The present invention further provides a heat exchange device, including a refrigerant system and a sensor installed in the refrigerant system, wherein the sensor is the aforementioned sensor.

[0007] The technical effects of the sensor and heat exchange device of the present invention are as follows:

[0008] The sensor of the present invention can control the melting depth of the weld to a certain extent, thereby improving the strength of the product.

[0009] At the same time, the thermal influence of welding on the sintered glass can be reduced, thereby improving the reliability of the sensor of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of a specific embodiment of the sensor provided by the present invention;

[0011] Figure 2 for Figure 1 A partial enlarged view of the sensor;

[0012] Figure 3 for Figure 1 A schematic diagram of the structure of the base component in the sensor;

[0013] Figure 4 for Figure 1 A schematic diagram of the structure of the mounting base in the sensor;

[0014] in, Figure 1-Figure 4 The reference numerals in the figures are described as follows:

[0015] 1-base component; 1a-step hole; a-chamfered structure; 11-end wall; 12-first connecting section; 13-second connecting section; 2-mounting seat; 2a-annular protrusion; 21-first equal diameter section; 22-second equal diameter section; 23-reducing diameter section; 24-third equal diameter section; 3-sintered glass; 4-shell; 4a-step hole portion. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] The “plurality” mentioned herein generally means more than two; and when “plurality” is used to indicate the number of certain components, it does not indicate the relationship between the quantities of these components.

[0018] Please refer to Figure 1-Figure 4 , Figure 1 A schematic diagram of the structure of a specific embodiment of the sensor provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the sensor; Figure 3 for Figure 1 A schematic diagram of the structure of the base component in the sensor; Figure 4 for Figure 1 Schematic diagram of the structure of the mounting base in the sensor.

[0019] The present invention provides a sensor, specifically a pressure sensor, comprising a base component 1 and a mounting seat 2, wherein a sintered glass 3 is mounted in the middle of the mounting seat 2, the base component 1 has a step hole 1a, the mounting seat 2 has an annular protrusion 2a, and the mounting seat 2 is partially mounted inside the step hole 1a, the annular protrusion 2a and the end wall 11 of the step hole 1a are matched and fixed by welding, and the weld formed after welding is as follows Figure 1 and Figure 2 As shown, the weld is located at the junction of the annular protrusion 2a and the end wall 11 of the step hole 1a in area A, the weld penetration range is 1.2mm to 1.5mm, and the radial distance between the outer peripheral surface of the annular protrusion 2a and the outer peripheral surface of the sintered glass 3 along the base component 1 is greater than or equal to 4.5mm.

[0020] In the sensor of the present invention, the base component 1 is made of stainless steel, and the mounting base 2 is made of stainless steel. The base component 1 and the mounting base 2 are first assembled and then welded, such as laser welding, to form an integral body, thereby achieving a sealing effect. At the same time, since the sensor of the present invention is mainly used for CO 2 Fields such as refrigerant systems are characterized by a high pressure range. Therefore, there are high requirements for the penetration depth of the weld after welding. Studies have found that when the penetration depth is 0.94mm, the welding strength does not meet the life test requirements, and the product is at risk of being damaged and leaking. Considering the safety margin, the lower limit of the penetration depth is set at 1.2mm; at the same time, since sintered glass 3 is installed in the middle of the mounting seat 2, a certain amount of heat will be transferred to the surface of the sintered glass 3 during laser welding. After evaluation, this product requires that the glass withstand temperature after welding is ≤180°C. When the penetration depth is 1.77mm, the temperature of the sintered glass 3 is 175°C. When the penetration depth is too deep, the sintered glass 3 will have the risk of bursting. Considering the safety margin, the upper limit of the penetration depth is set at 1.5mm, and the radial distance between the outer peripheral surface of the annular protrusion 2a and the outer peripheral surface of the sintered glass 3 along the base component 1 must be no less than 4.5mm.

[0021] It can be seen that the sensor of the present invention has a certain control over the weld depth range of the laser welding part, and has been optimized from a structure that could not meet the strength requirements under high pressure to a structure that can ensure the strength of the product after welding. Even when the sensor is used in harsh environments (especially when subjected to continuous high pressure impact), the sensor can still be guaranteed to be airtight and free of damage and can be used normally. It can also reduce the thermal impact of welding on the sintered glass 3, thereby improving the reliability of the sensor of the present invention.

[0022] In this embodiment, the wall thickness of the laser welding portion of the mounting seat 2 is designed to be 1.3 mm.

[0023] It can be understood that the sensor of the present invention is widely applicable to air conditioning, refrigeration and freezing fields, chillers, CO 2 Refrigerant system field, refrigeration systems and heat pump units.

[0024] Among them, Figure 4As shown, in this embodiment, the mounting seat 2 includes an axially connected first equal diameter section 21 and a second equal diameter section 22, the diameter of the first equal diameter section 21 is larger than the diameter of the second equal diameter section 22, the part of the first equal diameter section 21 protruding from the second equal diameter section 22 forms an annular protrusion 2a, and an abutment wall is formed between the first equal diameter section 21 and the second equal diameter section 22. In the installed state, the first equal diameter section 21 is located inside the step hole 1a, and the abutment wall abuts against the end wall 11 of the step hole 1a and is welded and fixed together.

[0025] In this way, the abutment wall and the end wall 11 of the stepped hole 1a can simultaneously play an axial limiting role, so that the mounting seat 2 can be stably installed inside the stepped hole 1a, facilitating subsequent welding operations and ensuring the installation accuracy of the two.

[0026] Furthermore, in this embodiment, the inner diameter of the step hole 1a is 19.4 mm (tolerance: +0.02 / 0); the outer diameter of the second equal diameter section 22 is 19.4 mm (tolerance: -0.01 / -0.025).

[0027] That is to say, the difference between the inner diameter of the stepped hole 1a and the outer diameter of the second equal diameter section 22 is in the range of 0.01 mm to 0.045 mm. Therefore, there is a certain gap between the two when they are assembled.

[0028] Since the base component 1 and the mounting base 2 are fixed by welding, such as laser welding, a certain amount of heat will inevitably be transferred outward during the welding process. Therefore, there is a gap between the second equal-diameter section 22 and the step hole 1a, which is more convenient for heat dissipation, reduces the impact of heat on the product, especially the impact on the sintered glass 3, and ensures the reliability of the product.

[0029] Of course, the above values ​​are only for illustrative purposes. In actual applications, the above values ​​can also be adaptively adjusted according to the size of the sensor.

[0030] Please continue to refer to Figure 4 In this embodiment, the mounting base 2 also includes a reducing section 23, which is connected to the inner end of the second equal diameter section 22. Along the longitudinal direction of the sensor, the reducing section 23 is located below the second equal diameter section 22, and the diameter of the reducing section 23 gradually decreases in the direction away from the second equal diameter section 22.

[0031] In this way, the diameter-reducing section 23 can play a guiding role, making it easier to install the mounting seat 2 inside the stepped hole 1 a, thereby improving assembly efficiency.

[0032] It should be noted that the end of the mounting seat 2 installed inside the base component 1 is defined as the “inner end” here.

[0033] It is understandable that in practical applications, it is also feasible that the mounting seat 2 only includes the variable diameter section 23 , or the mounting seat 2 also includes a third equal diameter section 24 , and the third equal diameter section 24 is connected to the inner end of the variable diameter section 23 .

[0034] Furthermore, if Figure 3 As shown, the inner wall of the step hole 1a is also provided with a chamfer structure a at the opening end.

[0035] It can be understood that the chamfered structure a can also play a guiding role, making it easier to install the mounting seat 2 inside the step hole 1a, thereby improving assembly efficiency.

[0036] Please continue to refer to Figure 1 and Figure 3 The sensor of the present invention further comprises a shell 4, the shell 4 and the base component 1 are fixedly connected, a mounting cavity is formed inside the shell 4 and the base component 1, and the mounting seat 2 is encapsulated inside the mounting cavity.

[0037] Among them, the outer peripheral wall of the base component 1 includes an axially connected first connecting section 12 and a second connecting section 13, the first connecting section 12 is close to the opening end of the step hole 1a, the diameter of the first connecting section 12 is smaller than the diameter of the second connecting section 13, the upper end surface of the first connecting section 12 serves as the end wall 11 of the aforementioned step hole 1a, and an annular step surface 1b is formed between the first connecting section 12 and the second connecting section 13. During the installation process, the shell 4 is fitted with the first connecting section 12, and the end wall of the open end of the shell 4 abuts against the annular step surface 1b, which plays an axial limiting role, so that the shell 4 can be stably installed on the outside of the base component 1, which is convenient for subsequent fixing operations and ensures the installation accuracy of the two.

[0038] The shell 4 and the base component 1 may also be fixed by welding.

[0039] Please continue to refer to Figure 1 The shell 4 has a stepped hole 4a inside, the annular protrusion 2a and the first connecting section 12 are located inside the stepped hole 4a, and there is a distance between the outer peripheral walls of the annular protrusion 2a and the first connecting section 12 and the inner peripheral wall of the stepped hole 4a.

[0040] Since the mounting seat 2 and the base component 1 are fixed by laser welding, and bulges are inevitably generated after the stainless steel material is re-melted, a stepped hole portion 4a is provided inside the shell 4, so that there is a spacing between the outer peripheral wall of the annular protrusion 2a and the first connecting section 12 and the inner peripheral wall of the stepped hole portion 4a. The shell 4 can avoid the bulges generated by the mounting seat 2 and the base component 1 after welding, thereby ensuring that there is no interference when the shell 4 is assembled.

[0041] The present invention further provides a heat exchange device, including a refrigerant system and a sensor installed in the refrigerant system, wherein the sensor is the aforementioned sensor.

[0042] The heat exchange device of the present invention includes the aforementioned sensor, and therefore has the same technical effect as the aforementioned sensor, which will not be described in detail here.

[0043] Among them, the refrigerant system can be CO 2 Refrigerant systems, air conditioning, refrigeration and freezing fields, chillers, heat pump units, etc.

[0044] The above is a detailed introduction to a sensor and a heat exchange device provided by the present invention. The principle and implementation method of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sensor, comprising a base component (1) and a mounting seat (2), wherein a sintered glass (3) is mounted in the middle of the mounting seat (2), characterized in that: The base component (1) has a stepped hole (1a), and the mounting seat (2) has an annular protrusion (2a). The mounting seat (2) is partially located inside the stepped hole (1a). The annular protrusion (2a) and the end wall (11) of the stepped hole (1a) are welded and fixed. The weld formed after welding has a radial penetration depth range of 1.2 mm to 1.5 mm along the radial direction of the base component (1). The outer peripheral surface of the annular protrusion (2a) and the outer peripheral surface of the sintered glass (3) are not less than 4.5 mm along the radial direction of the base component (1).

2. The sensor according to claim 1, characterized in that: The mounting seat (2) comprises a first equal-diameter section (21) and a second equal-diameter section (22) which are axially connected, the diameter of the first equal-diameter section (21) being larger than the diameter of the second equal-diameter section (22), and the portion of the first equal-diameter section (21) protruding from the second equal-diameter section (22) forming the annular protrusion (2a).

3. The sensor according to claim 2, characterized in that: The difference between the inner diameter of the step hole (1a) and the outer diameter of the second equal diameter section (22) is in the range of 0.01 mm to 0.045 mm.

4. The sensor according to claim 2, characterized in that: The mounting seat (2) further comprises a diameter-reducing section (23), which is located below the second equal-diameter section (22) in the longitudinal direction of the sensor, and the diameter of the diameter-reducing section (23) gradually decreases in a direction away from the second equal-diameter section (22).

5. The sensor according to claim 1, characterized in that: The base component (1) is made of stainless steel, the mounting seat (2) is made of stainless steel, and the annular protrusion (2a) and the end wall (11) of the step hole (1a) are fixed by laser welding.

6. The sensor according to any one of claims 1 to 5, characterized in that: The inner wall of the step hole (1a) is provided with a chamfered structure (a) at the opening end.

7. The sensor according to any one of claims 1 to 5, characterized in that: It also comprises a shell (4), wherein the shell (4) is fixedly connected to the base component (1), an installation cavity is formed inside, and the installation seat (2) is encapsulated inside the installation cavity.

8. The sensor according to claim 7, characterized in that: The outer peripheral wall of the base component (1) comprises a first connecting section (12) and a second connecting section (13) which are axially connected, the first connecting section (12) being close to the opening end of the step hole (1a), the diameter of the first connecting section (12) being smaller than the diameter of the second connecting section (13), an annular step surface (1b) being formed between the first connecting section (12) and the second connecting section (13), the shell (4) being fitted over the first connecting section (12), and the end wall of the opening end of the shell (4) being fixed to the annular step surface (1b).

9. The sensor according to claim 8, characterized in that The shell (4) has a stepped hole portion (4a) inside, the annular protrusion (2a) and the first connecting section (12) are located inside the stepped hole portion (4a), and there is a distance between the outer peripheral walls of the annular protrusion (2a) and the first connecting section (12) and the inner peripheral wall of the stepped hole portion (4a).

10. A heat exchange device, comprising a refrigerant system and a sensor installed in the refrigerant system, characterized in that: The sensor is the sensor according to any one of claims 1 to 9.

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