Test equipment and compressors for pressure equipment
By using sealing connection technology combined with filler layer and thrust part in the liquid level sensor, the problem of pressure resistance and cost control of liquid level sensors in high-temperature and high-pressure environments is solved, and compact, low-cost and efficient liquid level detection is achieved.
Patent Information
- Application Number
- CN201810657351.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-06-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2038-06-22
AI Technical Summary
In existing pressure equipment, the liquid level sensors are difficult to meet the requirements of pressure resistance, high temperature resistance and cost control in high-temperature environments, and the high-temperature sintering process is prone to cause stress cracks, increasing production costs and product defect rate.
The sealing connection method of the filler layer is used between the light transmitting body and the base, and the combination of the thrust part and the inclined connection surface reduces the process requirements and initial investment costs, avoids the problem of stress cracks, and builds a compact and voltage-resistant photoelectricity Level sensor.
It achieves the improvement of pressure resistance performance in high temperature and high pressure environments, reduces production costs and product defect rate, improves yield rate, and simplifies structural design, suitable for space-constrained applications.
Smart Images
Figure CN110631658B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a detection device for pressure equipment and a compressor comprising the detection device, wherein the detection device is particularly a photoelectric liquid level sensor. Background Art
[0002] This section provides background information related to the present disclosure which does not necessarily constitute prior art to the present invention.
[0003] It is usually necessary to detect areas in pressure equipment under high pressure to ensure normal operation of the equipment or troubleshooting. For example, the level of lubricating oil in an oil pool under high temperature and high pressure in a compressor is detected. A lubrication system is generally used in compressors to ensure that all moving parts in the machine are fully lubricated. For many reasons, insufficient lubricating oil may occur in the lubrication system, thus affecting the efficiency and service life of the machine. Usually, a liquid level sensor is used in the lubrication system to detect the amount of oil in the lubricating oil pool. When the oil level is detected to be lower than the predetermined value, an alarm needs to be issued in time to protect the machine.
[0004] In the lubrication system of refrigeration or air-conditioning compressors, there are special requirements for the lubricating oil level detection device that detects the status of the lubrication system. It is stricter than the general liquid level sensor in terms of pressure resistance, high temperature resistance, reliability and volume limitation.
[0005] Common types of liquid level sensors used in refrigeration or air conditioning compressors are: 1) float type liquid level sensor, which has a simple structure and low cost, but is large in size and is not suitable for occasions with limited space; 2) photoelectric liquid level sensor, which has a compact structure and high reliability, but is expensive when meeting the requirements of pressure resistance and high temperature resistance; 3) capacitive liquid level sensor, which has a compact structure, but the circuit part is more expensive as the reliability and environmental adaptability requirements increase; 4) thermistor liquid level sensor, which has a compact structure, but requires an additional conversion circuit board when outputting dry node signals. Therefore, in the art, there is a need for such a withstand voltage detection device, which is manufactured using a new process that can reduce costs and / or reduce product defects. Summary of the invention
[0006] Technical Problems to be Solved by the Invention
[0007] An object of the present invention is to provide a detection device that can ensure and improve the pressure resistance performance while having low process requirements.
[0008] Another object of the present invention is to provide a detection device capable of reducing initial investment costs while ensuring and improving pressure resistance performance.
[0009] Another object of the present invention is to provide a detection device that can ensure and improve the pressure resistance performance while avoiding the problem of stress cracks caused by sintering cooling to improve the yield rate.
[0010] Another object of the present invention is to provide a detection device with simple structure and small size.
[0011] Technical Solution
[0012] According to one aspect of the present invention, there is provided a detection device for a pressure device, the detection device comprising: a light-transmitting body, the light-transmitting body having a contact portion and a connecting portion, the contact portion being arranged to contact an internal pressure space of the pressure device, and a base, the light-transmitting body being connected to the base via the connecting portion, wherein a packing layer is arranged between the connecting portion and the base for sealingly connecting the light-transmitting body to the base.
[0013] Preferably, the base has a cavity for accommodating the connecting portion, and the filler layer is arranged between the connecting portion of the light-transmitting body and the surface of the cavity of the base.
[0014] Preferably, the base is provided with a thrust portion for limiting the light-transmitting body relative to a pressure difference direction, and the pressure difference direction is a direction from the high-pressure side of the internal pressure space toward the low-pressure side of the cavity of the base.
[0015] Preferably, the thrust portion includes a protrusion protruding from a surface of the cavity of the base into the cavity.
[0016] Preferably, the connecting surface between the base and the packing layer is inclined toward the cavity along the pressure difference direction, and / or the connecting surface between the connecting portion of the light-transmitting body and the packing layer is inclined toward the cavity along the pressure difference direction, and the pressure difference direction is the direction from the high-pressure side of the internal pressure space toward the low-pressure side of the cavity of the base.
[0017] Preferably, the detection device is a photoelectric liquid level sensor.
[0018] Preferably, the photoelectric liquid level sensor comprises a circuit device for photoelectric emission, photoelectric reception and / or signal processing, and the circuit device is packaged in the cavity of the base.
[0019] Preferably, the light-transmitting body is a glass light-transmitting body, and the base is a metal base.
[0020] Preferably, the filler layer is configured to seal the light-transmitting body and the base at room temperature or above room temperature but below the softening temperature of glass.
[0021] Preferably, the detection device is mounted to the pressure device by fixing the base to a housing of the pressure device such that the contact portion is exposed to the internal pressure space.
[0022] According to another aspect of the present invention, a compressor is provided, wherein the compressor comprises the above-mentioned detection device.
[0023] Preferably, the detection device is a photoelectric liquid level sensor arranged at the oil pool of the compressor to detect the liquid level of the lubricating oil.
[0024] Beneficial Effects
[0025] The advantages of the detection device for pressure equipment according to the preferred embodiment of the present invention are at least: 1) Compared with the detection device of the related art that adopts a high-temperature sintering process, the detection device of the present invention ensures and improves the pressure resistance while having low process requirements, strong environmental adaptability, and reduced initial investment costs, and / or avoids the problem of stress cracks caused by sintering cooling to improve the yield rate; 2) Compared with the split structure of the detection device of the related art, the detection device of the present invention has a simple structure, a small size, and is easy to carry and install. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The features and advantages of the present invention will be more easily understood through the following detailed description provided with reference to the accompanying drawings, in which:
[0027] Figure 1 A cross-sectional view showing a photoelectric liquid level sensor including a light-transmitting body and a base in the related art;
[0028] Figure 2 A cross-sectional view showing a light-transmitting body and a base of a photoelectric liquid level sensor of the related art, wherein the light-transmitting body and the base are combined by sintering;
[0029] Figure 3 A cross-sectional view of a detection device according to the present invention is shown, wherein a filler layer is provided between a light-transmitting body and a base of the detection device;
[0030] Figure 4 A cross-sectional view of a detection device according to the present invention is shown, wherein a base of the detection device is provided with a thrust portion for limiting the position of the light-transmitting body relative to the pressure difference direction;
[0031] Figure 5 A cross-sectional view of a detection device according to the present invention is shown, wherein a connection surface between a base of the detection device and a packing layer is inclined toward the cavity along a pressure difference direction;
[0032] Figure 6A cross-sectional view of a detection device according to the present invention is shown, wherein a connection surface between a connection portion of a light-transmitting body of the detection device and a packing layer is inclined toward the cavity along a pressure difference direction; and
[0033] Figure 7 A cross-sectional view of a detection device according to the present invention is shown, wherein a circuit device is encapsulated in the cavity of a photoelectric liquid level sensor serving as the detection device. DETAILED DESCRIPTION
[0034] The following description of the relevant technical solutions and preferred embodiments is merely exemplary and is by no means limiting of the present invention and its application or usage.
[0035] First, combine Figure 1 to Figure 2 A photoelectric liquid level sensor 1 for detecting the liquid level of an oil pool under a high pressure environment according to the related art is described, which comprises a light-transmitting body 2, a base 3, and an external housing 5 for accommodating a circuit device 4. The photoelectric liquid level sensor 1 utilizes the difference in the refractive index of light in air and liquid, that is, when the glass element is in the gas, the gas refractive index is low, and the condition of total reflection of the light is achieved, and the light can reach the receiving device; when the glass element is in the liquid, the liquid refractive index is high, and the condition of total reflection is not achieved, and the light is dissipated after refraction and cannot reach the receiving device. By reasonably setting the optical surface of the light-transmitting body 2, the liquid level is detected by photoelectrically sensing whether the liquid level of the lubricating oil or refrigerant exceeds the detection position.
[0036] In the photoelectric liquid level sensor, the light-transmitting body 2 serves to isolate the measured liquid level from the outside world. The pressure resistance requirement is the same as that of the compressor housing, and light (including but not limited to visible light, infrared, and ultraviolet light) needs to pass through. The current process is to sinter the light-transmitting body 2 directly on the base. In the sintering process, the sintering temperature is greater than the melting point of the glass and less than the melting point of the base, and the sintering temperature is usually above 800 degrees Celsius, such as 1300 degrees Celsius. The softening and deformation of the light-transmitting body 2 during high-temperature sintering may affect the optical performance. At the same time, the cooling process after the sintering process is long, and the problem of cracks caused by stress due to the different expansion coefficients of the light-transmitting body 2 and the base 3 reduces the yield rate, which makes the high-temperature sintering process high, the required equipment is complex, and the expansion coefficients of the light-transmitting body 2 and the base 3 are also high. In particular, in the context of industrial manufacturing 4.0, that is, a small batch and multi-variety manufacturing model, this will bring higher costs and initial investment.
[0037] In addition, the photoelectric liquid level sensor according to the related art adopts a split structure in which the base-translucent body assembly is threadedly connected to the external shell, which is advantageous in that it is easy to manufacture separately, avoids the external shell with poor temperature resistance from being affected by the high temperature of the sintering process of the base-translucent body assembly, and is easy to assemble during use. However, this split structure also makes the photoelectric liquid level sensor large in size and complex in structure.
[0038] Next, combine Figures 3 to 7 The detection device 10 for a compressor (pressure equipment) according to an exemplary embodiment of the present invention is described. After reading this specification, those skilled in the art will understand that the pressure equipment to which the detection device according to the present invention is applicable is not limited to compressors, but can be applied to all machines having an area to be detected under a high pressure environment, for example.
[0039] See also Figure 3 , the detection device 10 includes a light-transmitting body 11 and a base 12, wherein the light-transmitting body 11 has a contact portion 111 and a connecting portion 112, and the contact portion 111 is configured to contact the internal pressure space of the pressure device. In particular, the detection device 10 is installed to the pressure device by fixing the base 12 to the housing of the pressure device, so that the contact portion 111 is exposed to the internal pressure space. The light-transmitting body 11 is connected to the base 12 via the connecting portion 112, wherein a packing layer 13 for sealingly connecting the light-transmitting body 11 to the base 12 is provided between the connecting portion 112 and the base 12, wherein the packing layer can be an epoxy resin material or an acrylic material. In addition, the packing layer can also be a mixture of the above materials with reinforcing fibers (e.g., glass fibers, carbon fibers, etc.). In particular, when the packing layer is an epoxy resin material, it has the advantages of low cost, sufficient strength, high temperature resistance, and convenient operation. Compared with the detection devices of related technologies, such as the above-mentioned photoelectric liquid level sensor 1, which directly combine the light-transmitting body and the base by a high-temperature sintering process, the present invention provides a packing layer 13 between the connecting portion 112 of the light-transmitting body 11 and the base 12 to seal the light-transmitting body 11 and the base 12. While ensuring and improving the pressure resistance performance, the present invention has low process requirements, strong environmental adaptability, reduced initial investment costs, and avoids the problem of stress cracks caused by high-temperature sintering cooling to improve the yield rate.
[0040] According to one aspect of the embodiments of the present invention, the base 12 has a cavity 14 for accommodating the connecting portion 112, and the packing layer 13 is arranged between the connecting portion 112 of the light-transmitting body 11 and the surface 141 of the cavity 14 of the base 12. By configuring the base 12 to have a cavity 14 for accommodating the connecting portion 112, arranging the connecting portion of the light-transmitting body to be accommodated in the cavity of the base, and arranging a packing layer between the connecting portion and the cavity, the structure of the detection device is made more compact and the sealing connection performance is also promoted. However, it is understood that other suitable structures can also be adopted, for example, the light-transmitting body can be directly overlapped on the end of the base while adopting a packing layer between the light-transmitting body and the base to play a sealing connection role.
[0041] Advantageously, see Figure 4 , the base 12 is provided with a thrust portion for limiting the light-transmitting body 11 relative to the pressure difference direction A, and the pressure difference direction A is the direction from the high-pressure side of the internal pressure space toward the low-pressure side of the cavity 14 of the base 12. The thrust structure further improves the pressure resistance and sealing performance of the light-transmitting body and the base sealed and combined by the packing layer relative to the internal pressure space of the pressure device. In particular, the thrust portion may include a protrusion 15 protruding from the surface 141 of the cavity 14 of the base 12 into the cavity. The protrusion may include a plurality of ribs (e.g., a plurality of spaced ribs) protruding from the surface 141 of the cavity 14 of the base 12 into the cavity. In addition, in the case where the base 12 is a cylindrical structure, the protrusion 15 may be a circular flange (e.g., a continuous circular flange) protruding from the cylindrical cavity into the cavity.
[0042] According to one aspect of the embodiments of the present invention, see Figure 5 to Figure 6 , the connection surface 121 between the base 12 and the packing layer 13 is inclined toward the cavity along the pressure difference direction A, and / or the connection surface 113 between the connection portion 112 of the light-transmitting body 11 and the packing layer 13 is inclined toward the cavity along the pressure difference direction A, and the pressure difference direction A is the direction from the high-pressure side of the internal pressure space toward the low-pressure side of the cavity 14 of the base 12. With the help of the structure of the connection surface inclined toward the cavity along the pressure difference direction, a thrust force in the opposite direction of the pressure difference is generated on the connection surface, thereby improving the pressure resistance and sealing performance of the light-transmitting body and the base. According to the present invention, it can be understood by those skilled in the art that the structure of the connection surface inclined toward the cavity along the pressure difference direction can be combined with the above-mentioned thrust portion structure, which can further improve the pressure resistance and sealing performance of the light-transmitting body and the base.
[0043] Advantageously, the detection device 10 is a photoelectric liquid level sensor. However, those skilled in the art will appreciate that the detection device 10 may also be other suitable detection devices, for example, a detection device having a light-transmitting body and a base disposed on the housing of the pressure device for directly visually observing the liquid level in the pressure device.
[0044] In addition, advantageously, the light-transmitting body 11 is a glass light-transmitting body, and the base 12 is a metal base. In this case, the packing layer 13 is configured to seal the light-transmitting body 11 and the base 12 at room temperature or above room temperature but below the softening temperature of the glass, thereby avoiding the problem of affecting optical performance and generating stress cracks caused by high-temperature sintering of the photoelectric liquid level sensor in the related art to combine the glass light-transmitting body and the metal base, wherein the softening temperature of the glass is approximately in the range of 400 degrees Celsius to 850 degrees Celsius depending on the type of glass.
[0045] More advantageously, see Figure 7 The photoelectric liquid level sensor includes a circuit device 16 for photoelectric emission, photoelectric reception and / or signal processing, and the circuit device 16 is packaged in the cavity 14 of the base 12. Compared with the split structure of the photoelectric sensor in the related art, the photoelectric sensor of the present invention has a simple structure, a small volume, and is easy to carry and install.
[0046] The present invention also provides a compressor including the above-mentioned detection device 10, wherein the detection device 10 is a photoelectric liquid level sensor arranged in an oil pool of the compressor which is usually in a high temperature and high pressure environment to detect the liquid level of the lubricating oil.
[0047] Although various aspects of the embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific embodiments described and shown in detail herein, and other modifications and variations can be realized by those skilled in the art without departing from the spirit and scope of the present invention. All these modifications and variations fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.
Claims
1. A detection device (10) for pressure equipment, the detection device (10) comprising: a light-transmitting body (11), the light-transmitting body (11) having a contact portion (111) and a connecting portion (112), the contact portion (111) being arranged to contact the internal pressure space of the pressure device, and a base (12), wherein the light-transmitting body (11) is connected to the base (12) via the connecting portion (112), A packing layer (13) is provided between the connecting portion (112) and the base (12) for sealingly connecting the light-transmitting body (11) and the base (12). The light-transmitting body (11) is a glass light-transmitting body, the base (12) is a metal base, and the filler layer (13) is an epoxy resin material or an acrylic material and is configured to seal the light-transmitting body (11) and the base (12) at room temperature or above room temperature but below the softening temperature of glass.
2. The detection device (10) according to claim 1, wherein: The base (12) has a cavity (14) for accommodating the connecting portion (112), and the filler layer (13) is arranged between the connecting portion (112) and a surface (141) of the cavity (14).
3. The detection device (10) according to claim 2, wherein: The base (12) is provided with a thrust portion for limiting the light-transmitting body (11) relative to a pressure difference direction (A), wherein the pressure difference direction (A) is a direction from a high-pressure side of the internal pressure space toward a low-pressure side of the cavity (14) of the base (12).
4. The detection device (10) according to claim 3, wherein: The thrust portion includes a protrusion (15) protruding from the surface (141) of the cavity (14) of the base (12) into the cavity.
5. The detection device (10) according to claim 2, wherein: The connection surface (121) between the base (12) and the packing layer (13) is inclined toward the cavity along the pressure difference direction (A), and / or the connection surface (113) between the connection portion (112) of the light-transmitting body (11) and the packing layer (13) is inclined toward the cavity along the pressure difference direction (A), and the pressure difference direction (A) is the direction from the high-pressure side of the internal pressure space toward the low-pressure side of the cavity (14) of the base (12).
6. The detection device (10) according to any one of claims 2 to 5, wherein: The detection device (10) is a photoelectric liquid level sensor.
7. The detection device (10) according to claim 6, wherein: The photoelectric liquid level sensor comprises a circuit device (16) for photoelectric emission, photoelectric reception and / or signal processing, and the circuit device (16) is packaged in the cavity (14) of the base (12).
8. The detection device (10) according to any one of claims 1 to 5, wherein: The detection device (10) is mounted to the pressure device by fixing the base (12) to the housing of the pressure device so that the contact portion (111) is exposed to the internal pressure space.
9. A compressor, wherein: The compressor comprises a detection device (10) according to any one of claims 1 to 8.
10. The compressor according to claim 9, wherein: The detection device (10) is a photoelectric liquid level sensor arranged at the oil pool of the compressor to detect the liquid level of the lubricating oil.