Intrinsic safety type oil level sensor for mining carbon dioxide refrigeration equipment

Abstract

The utility model discloses an intrinsic safety type oil level sensor for mining carbon dioxide refrigeration equipment, which is applied to the technical field of coal mine laneway refrigeration and comprises a shell cover, a sealing gasket, a shell, a sensor circuit board, an oil sight glass chuck, an observation window, a communication joint, a waterproof wiring port, a nylon nut and a nylon stud. An observation hole is formed in the connecting surface of the shell and the compressor oil sight glass, an oil sight glass chuck corresponding to the compressor oil sight glass is arranged around the observation hole, and the compressor oil sight glass is clamped on the oil sight glass chuck by the shell through screws; the observation window is arranged on an observation hole in the shell, the sensor circuit board is fixed on a nylon stud arranged in the shell through a nylon nut, and the position of the sensor circuit board is opposite to the observation window. According to the utility model, the actual working environment temperature of the internal circuit of the sensor is effectively improved, the oil level detection precision is effectively improved, and the mounting, dismounting and maintenance convenience of the oil level sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine roadway refrigeration, in particular to an intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device. Background Art

[0002] At present, the carbon dioxide compressor in the currently used mine refrigeration and dehumidification integrated machine device adopts a semi-closed piston compressor. The lubricating oil in the compressor plays a role in lubrication and cooling, protecting the piston in the compressor from wear during reciprocating motion and cooling the compressor at the same time. In addition, oil-gas separation devices are designed on both the high-pressure side and the low-pressure side of the refrigeration device for the recovery and circulation of lubricating oil. Therefore, it is necessary to install an oil level sensor to monitor the oil levels of the compressor and the high- and low-pressure oil-gas separation devices in real time, and transmit the oil level signal inside the compressor to the main control of the refrigeration device in real time. The logic circuit controls the oil pump oil replenishment action according to the oil level. When the level is too low, the controller sends an oil replenishment signal to the oil pump, and the oil pump replenishes oil to the compressor.

[0003] At present, the oil level sensors used in mine refrigeration equipment are usually installed on the oil sight glass of the refrigeration compressor. The sensor housing is made of stainless steel with high thermal conductivity. The housing is in direct contact with the circuit board. During the operation of the refrigeration unit, the local temperature of the high-pressure oil control can reach 130°C, and the heat is directly conducted to the internal circuit of the sensor through the stainless steel housing, resulting in the actual ambient temperature of the circuit exceeding the normal operating temperature of the circuit, and the sensor circuit cannot accurately detect the oil level. Moreover, the housing of the used oil level sensor is heavy and has too many connectors. Due to the compact structure inside the refrigeration unit, the oil level sensor is not easy to install, disassemble and repair.

[0004] Therefore, how to provide an intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device that can effectively improve the actual working environment temperature of the internal circuit of the sensor, effectively improve the oil level detection accuracy, and effectively improve the installation, disassembly and maintenance convenience of the oil level sensor by reducing the housing weight and improving the connection method between the sensor and the refrigeration unit is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In view of this, the utility model provides an intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device, comprising: a shell cover, a sealing gasket, a housing, a sensor circuit board, an oil sight glass chuck, an observation window, a connecting joint, a waterproof wiring port, a nylon nut, a nylon stud;

[0008] An observation hole is provided on the connection surface between the housing and the compressor oil sight glass, and an oil sight glass chuck corresponding to the compressor oil sight glass is provided around the observation hole. The housing uses screws to snap-connect the compressor oil sight glass to the oil sight glass chuck;

[0009] The observation window is provided on the observation hole inside the housing. The sensor circuit board is fixed to the nylon stud provided inside the housing through a nylon nut, and the position of the sensor circuit board is directly opposite to the observation window;

[0010] On the other side of the connection surface, an operation hole is provided. The housing cover is fixed to the other side of the connection surface through a gasket using screws to seal the operation hole;

[0011] A communication hole is provided on the side surface of the housing. The communication joint is fully welded to the side surface and is concentric with the position of the communication hole. The communication joint is also connected with a waterproof wiring port for leading out the cable connected to the sensor circuit board to connect to the oil replenishment controller;

[0012] An infrared generator and an infrared sensor are provided on the sensor circuit board. The infrared generator emits an infrared signal, which sequentially passes through the observation window and the compressor oil sight glass and enters the compressor oil chamber. The infrared sensor judges whether the oil in the compressor oil chamber is insufficient according to the change of the received infrared signal and sends an oil replenishment signal to the oil replenishment controller.

[0013] Optionally, both the housing and the housing cover are made of 304 stainless steel plates with a thickness of 2 mm. The housing is formed by bending and welding, and the screws used to fix the housing cover to the housing are M2×10 cross-recessed countersunk head screws.

[0014] Optionally, the gasket is made of 3 mm thick flame-retardant rubber, and it produces elastic deformation after being pressed, with the thickness reduced by 1 mm.

[0015] Optionally, the sensor circuit board adopts an intrinsically safe circuit and is powered by 12 - 24V.

[0016] Optionally, the oil sight glass chuck is formed by turning the inner circle of a 304 stainless steel pipe with a thickness of 5 mm to form the outer circle The inner circle to The tolerance is +0.1~+0.3, and the screws used for the oil sight glass chuck to snap-connect the compressor oil sight glass are hexagon socket head cap screws.

[0017] Optionally, the observation window adopts 2 mm thick quartz glass, and the infrared light wave transmittance reaches 94%.

[0018] Optionally, the communication joint is made of 304 stainless steel round steel is turned to make the inner circle, and the internal thread is M16×1.5.

[0019] Optionally, the waterproof connection port includes: a compression nut, a bolt body, an O-ring, a clamping ring, and clamping claws. The O-ring is installed on the external thread of the bolt body. The waterproof connection port is connected to the connecting joint through the external thread. The clamping ring is installed on the head of the bolt body and is clamped by the clamping claws, and the compression nut is screwed tight.

[0020] Optionally, the nylon nut is made of nylon and has a size of M2.

[0021] Optionally, the nylon stud is made of nylon, has an inner hole of M2×5, and the stud is M2×6.

[0022] As can be seen from the above technical solutions, compared with the prior art, the present utility model proposes an intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device. By fixing the sensor circuit board on the nylon stud provided inside the housing using a nylon nut, effective heat insulation is achieved, effectively improving the actual working environment temperature of the internal circuit of the sensor and effectively improving the oil level detection accuracy; by using an oil sight glass chuck to connect the compressor oil sight glass and the housing in a chuck manner and tightening with bolts, it is convenient for installation and positioning, the fixing method is more reliable, and the convenience of installation, disassembly and maintenance of the oil level sensor is effectively improved; and the housing of the present utility model is made of 304 stainless steel plate with a thickness of 2 mm, which reduces the weight of the housing. The housing is made of standard-thickness steel, which is convenient for production and processing. The sensor circuit adopts an intrinsically safe design, with low circuit output energy and small power, which can improve the safety of underground use. The flat rubber gasket used is convenient for production and manufacturing, reducing the economic cost and time cost of production and improving economic benefits. The housing design can meet the requirements of IP54 protection level, effectively protecting the internal circuit. The observation window uses circular colorless transparent quartz glass with a thickness of 2 mm, and the infrared light wave transmittance is 94%. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0024] Figure 1 It is a schematic plan view of the device structure of the present utility model.

[0025] Figure 2 It is a schematic three-dimensional view of the device structure of the present utility model.

[0026] Among them, there are shell cover - 1, gasket - 2, housing - 3, sensor circuit board - 4, oil sight glass chuck - 5, observation window - 6, connecting joint - 7, waterproof wiring port - 8, nylon nut - 9, nylon stud - 10, compressor oil sight glass - 11, oil level sensor - 12, and hexagon socket head screw - 13. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1:

[0029] Embodiment 1 of the present invention discloses an intrinsically safe oil level sensor 12 for a mine - used carbon dioxide refrigeration device. As Figure 1 、 Figure 2 shown, it includes: shell cover 1, gasket 2, housing 3, sensor circuit board 4, oil sight glass chuck 5, observation window 6, connecting joint 7, waterproof wiring port 8, nylon nut 9, and nylon stud 10.

[0030] An observation hole is provided on the connection surface of the housing 3 and the compressor oil sight glass 11, and an oil sight glass chuck 5 corresponding to the compressor oil sight glass 11 is provided around the observation hole. The housing 3 uses screws to clamp the compressor oil sight glass 11 on the oil sight glass chuck 5.

[0031] The observation window 6 is provided on the observation hole inside the housing 3. The sensor circuit board 4 is fixed on the nylon stud 10 provided inside the housing 3 through the nylon nut 9, and the position of the sensor circuit board 4 is directly opposite to the observation window 6.

[0032] On the other side of the connection surface, an operation hole is provided. The shell cover 1 is fixed to the other side of the connection surface through the gasket 2 using screws to seal the operation hole. After the screws are tightened, the surface of the shell cover 1 is flat as a whole to prevent surface scratching.

[0033] A communication hole is provided on the side of the housing 3. The connecting joint 7 is fully welded to the side and is concentric with the position of the communication hole. The connecting joint 7 is also connected with a waterproof wiring port 8 for leading out the cable connected to the sensor circuit board 4 to connect to the oil replenishment controller.

[0034] An infrared generator and an infrared sensor are provided on the sensor circuit board 4. The infrared generator emits an infrared signal, which sequentially passes through the observation window 6 and the compressor oil sight glass 11 and enters the compressor oil cavity. The infrared sensor judges whether the oil in the compressor oil cavity is insufficient according to the change in the received infrared signal and sends an oil replenishment signal to the oil replenishment controller.

[0035] Both the housing 3 and the housing cover 1 are made of 304 stainless steel plates with a thickness of 2 mm. The housing 3 is formed by bending and welding, and the screws used to fix the housing cover 1 to the housing 3 are M2×10 cross recessed countersunk head screws.

[0036] The gasket 2 is made of 3 mm thick flame-retardant rubber, which is flame-retardant and wear-resistant. After being compressed, it produces elastic deformation and its thickness decreases by 1 mm, meeting the IP54 protection level.

[0037] The sensor circuit board 4 adopts an intrinsically safe circuit and is powered by 12 - 24V.

[0038] The oil sight glass chuck 5 is formed by turning the inner circle of a 5 mm thick 304 stainless steel steel pipe to form the outer circle Turn the inner circle to The tolerance is +0.1 to +0.3, and the screws used for the oil sight glass chuck 5 to clamp the compressor oil sight glass 11 are hexagon socket head cap screws 13.

[0039] The observation window 6 is made of 2 mm thick quartz glass, and the infrared light wave transmittance reaches 94%.

[0040] The connecting joint 7 is made of 304 stainless steel round steel by turning the inner circle, with an internal thread of M16×1.5.

[0041] The waterproof wiring port 8 includes: a compression nut, a bolt body, an O-ring, a clamping ring, and a clamping claw. The O-ring is installed on the external thread of the bolt body. The waterproof wiring port 8 is connected to the connecting joint 7 through the external thread. The clamping ring is installed on the head of the bolt body and is clamped by using the clamping claw, and the compression nut is tightened.

[0042] The nylon nut 9 is made of nylon and has a size of M2.

[0043] The nylon stud 10 is made of nylon, with an inner hole of M2×5 and a stud of M2×6.

[0044] Working principle: The infrared generator provided on the sensor circuit board 4 emits an infrared signal, which sequentially passes through the observation window 6 and the compressor oil sight glass 11 (through its prism) and enters the compressor oil chamber. When the oil reserve is sufficient, the oil liquid will block the infrared signal, and the oil replenishment solenoid valve is in the normally closed state. When the oil reserve is insufficient, the oil level drops, the infrared signal will pass through the cavity above the liquid level, and the reflection travel will increase. The infrared sensor provided on the sensor circuit board 4 detects the change in the infrared signal and will send an oil replenishment signal to the oil replenishment controller to control the opening of the oil replenishment solenoid valve of the oil pump to replenish oil to the compressor.

[0045] An intrinsically safe oil level sensor for a mine-used carbon dioxide refrigeration device is disclosed in an embodiment of the present utility model. By fixing the sensor circuit board on nylon studs arranged inside the housing with nylon nuts, effective heat insulation is achieved, the actual working environment temperature of the internal circuit of the sensor is effectively improved, and the oil level detection accuracy is effectively increased; by using an oil sight glass chuck to connect the compressor oil sight glass and the housing in a chuck manner and tightening with bolts, it is convenient for installation and positioning, the fixing method is more reliable, and the convenience of installation, disassembly and maintenance of the oil level sensor is effectively improved; moreover, the housing of the present utility model is made of a 2mm-thick 304 stainless steel plate, which reduces the weight of the housing. The housing is made of standard-thickness steel, which is convenient for production and processing. The sensor circuit adopts an intrinsically safe design, with low circuit output energy and small power, which can improve the safety of underground use. The flat rubber gasket used is convenient for production, reduces the economic cost and time cost of production, improves economic benefits, the housing design can meet the requirements of IP54 protection level, effectively protects the internal circuit, and the observation window adopts a 2mm-thick circular colorless transparent quartz glass with an infrared light wave transmittance of 94%.

[0046] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment, characterized in that: include: Shell cover (1), sealing gasket (2), shell (3), sensor circuit board (4), oil sight glass chuck (5), observation window (6), connecting joint (7), waterproof wiring port (8), nylon nut (9), nylon stud (10); An observation hole is provided on the connection surface between the housing (3) and the compressor oil sight glass (11), and an oil sight glass chuck (5) corresponding to the compressor oil sight glass (11) is provided around the observation hole, and the housing (3) clamps the compressor oil sight glass (11) onto the oil sight glass chuck (5) by means of screws; The observation window (6) is arranged on the observation hole inside the housing (3); the sensor circuit board (4) is fixed to a nylon stud (10) arranged inside the housing (3) through the nylon nut (9); and the sensor circuit board (4) is located opposite to the observation window (6); An operating hole is provided on the other side of the connection surface, and the shell cover (1) is fixed to the other side of the connection surface by screws through the sealing gasket (2) to seal the operating hole; A connecting hole is provided on the side of the housing (3); the connecting joint (7) is fully welded to the side and is concentric with the connecting hole; the connecting joint (7) is also connected to a waterproof wiring port (8) for leading out the cable connected to the sensor circuit board (4) and connecting to an oil replenishment controller; The sensor circuit board (4) is provided with an infrared generator and an infrared sensor. The infrared generator sends out an infrared signal which passes through the observation window (6) and the compressor oil sight glass (11) in turn and enters the compressor oil chamber. The infrared sensor determines whether the oil in the compressor oil chamber is insufficient based on changes in the received infrared signal and sends an oil replenishment signal to the oil replenishment controller.

2. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1 is characterized in that: The shell (3) and the shell cover (1) are both made of 2 mm thick 304 stainless steel plates. The shell (3) is formed by bending and welding, and the screws used to fix the shell cover (1) to the shell (3) are M2×10 cross recessed countersunk screws.

3. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1 is characterized in that: The sealing pad (2) is made of 3 mm thick flame-retardant rubber and produces elastic deformation after being pressed, with the thickness reduced by 1 mm.

4. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1 is characterized in that: The sensor circuit board (4) adopts an intrinsically safe circuit and is powered by 12-24V.

5. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1 is characterized in that: The oil sight glass chuck (5) is made of 5mm thick 304 stainless steel pipe, and the inner circle is turned to form the outer circle. Car inner circle to The tolerance is +0.1 to +0.3, and the screws used for the oil sight glass chuck (5) to clamp the compressor oil sight glass (11) are hexagon socket screws.

6. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1, characterized in that: The observation window (6) is made of 2 mm thick quartz glass, and its infrared light wave transmittance reaches 94%.

7. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1, characterized in that: The connecting joint (7) is made of 304 stainless steel. Made of round steel with internal turning, internal thread M16×1.

5.

8. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1, characterized in that: The waterproof wiring port (8) comprises: a locking nut, a bolt body, an O-ring, a clamping ring, and a clamping grip. The O-ring is installed on the external thread of the bolt body. The waterproof wiring port (8) is connected to the connecting joint (7) via the external thread. The clamping ring is installed on the head of the bolt body and is clamped by the clamping grip. The locking nut is tightened.

9. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1, characterized in that: The nylon nut (9) is made of nylon and has a size of M2.

10. The intrinsically safe oil level sensor for mining carbon dioxide refrigeration equipment according to claim 1, characterized in that: The nylon stud (10) is made of nylon, the inner hole is M2×5, and the stud is M2×6.

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