A device for automatically adjusting fuel injection quantity according to temperature

Abstract

The utility model relates to a kind of temperature-sensing automatic regulating oil injection quantity's device, including casing, the casing side part is equipped with valve cavity, the rear end of the valve cavity is connected with low temperature lubricating oil, front end is connected with casing exhaust end or casing internal high temperature lubricating oil;Valve cavity rear end side part is equipped with the oil injection hole being connected with casing interior, adjusting core is equipped in valve cavity, and adjusting core is moved by adjusting the opening of oil injection hole, valve cavity is equipped with temperature sensor in adjusting core front end, and temperature sensor controls adjusting core movement by inductive temperature.The utility model temperature-sensing automatic regulating oil injection quantity's device design is reasonable, convenient and practical, by inductive equipment temperature, the size of oil injection hole opening is dynamically controlled to realize oil injection quantity adjustment, ensure on-demand oil supply, avoid the efficiency reduction and liquid strike risk caused by too much oil in conventional working condition, while ensuring that oil quantity is sufficient in severe working condition, improve the stability of equipment operation.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection quantity adjustment technology, and in particular to a device for automatically adjusting fuel injection quantity by sensing temperature. Background Technology

[0002] In oil-filled compressors, the medium generates heat during compression. Besides lubrication and sealing, the lubricating oil also needs to cool under harsh conditions. Currently, the main method is to drill oil injection holes in the compressor housing, through which refrigerant oil flows into the moving parts for lubrication and cooling. However, this structure has shortcomings. Because the size of the injection holes is fixed, the oil supply cannot be adjusted. For compressor reliability, the injection holes are often designed for the worst-case scenario, meaning they are designed at their maximum size. This leads to excessive oil entering the compressor under normal operating conditions, resulting in reduced efficiency and the risk of liquid slugging. Therefore, adjustable oil flow is crucial to prevent insufficient oil flow under harsh conditions and excessive oil flow under normal operating conditions. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a device for automatically adjusting the amount of fuel injection based on temperature, which dynamically controls the opening size of the fuel injection hole to adjust the amount of fuel injection, avoiding the reduction in efficiency and the risk of liquid slugging caused by excessive fuel under normal working conditions, while ensuring sufficient fuel under harsh working conditions and improving the stability of equipment operation.

[0004] This utility model is achieved by the following solution: a device for automatically adjusting the amount of oil injection based on temperature, including a housing, a valve chamber provided on the side of the housing, the rear end of the valve chamber being connected to low-temperature lubricating oil, the front end being connected to the exhaust end of the housing or high-temperature lubricating oil inside the housing; an oil injection hole connected to the inside of the housing is provided on the side of the rear end of the valve chamber, an adjusting core is provided in the valve chamber to adjust the opening of the oil injection hole by moving it, and a temperature sensor is provided in the valve chamber at the front end of the adjusting core to control the movement of the adjusting core by sensing the temperature.

[0005] Furthermore, the temperature sensor includes a temperature-sensing housing with an internal cavity containing a temperature-sensing liquid. A movable pin is provided through the front side of the temperature-sensing housing, which can slide back and forth relative to the cavity and whose rear end extends into the cavity. This allows the temperature-sensing liquid to expand when heated, pushing the movable pin forward and then pushing the adjusting core backward to increase the opening of the fuel injection hole.

[0006] Furthermore, the temperature sensing housing has a mounting hole extending through the rear end of the cavity, and a needle valve is installed in the mounting hole; the diameter of the cavity is more than three times the diameter of the movable pin.

[0007] Furthermore, the temperature sensing housing has a pin seat at the front of the cavity, and the movable pin is disposed through the middle of the pin seat and can slide back and forth relative to it. The front end face of the temperature sensing housing abuts against the front end of the valve cavity, and the rear end of the movable pin is retracted into the rear end face of the temperature sensing housing. A set distance is left between the rear end face of the movable pin and the rear end face of the temperature sensing housing.

[0008] Furthermore, the pin seat is provided with a first sealing component located on the outer periphery of the movable pin.

[0009] Furthermore, the regulating core is provided with a second sealing assembly in the middle, which divides the valve cavity into a high-temperature zone and a low-temperature zone that are isolated from each other.

[0010] Furthermore, a reset spring is fitted at the front of the adjusting core to push the adjusting core forward and reset; an annular retaining ring is provided at the front end of the adjusting core, which divides the high-temperature zone of the valve chamber into a high-temperature front chamber and a high-temperature rear chamber; the front end of the reset spring abuts against the annular retaining ring, and the rear end abuts against the inner wall of the high-temperature rear chamber; a connecting channel is opened on the front side of the adjusting core, which passes through the front side of the adjusting core and communicates with the high-temperature rear chamber; the rear end face of the temperature sensing housing abuts against the front end face of the adjusting core; and a connecting groove is opened on the rear side of the temperature sensing housing, which connects the high-temperature front chamber and the front end of the connecting channel.

[0011] Furthermore, the outer side of the housing is provided with an oil inlet hole communicating with the rear end of the valve chamber, the rear side of the adjusting core is provided with an oil distribution groove for communicating with the oil injection hole, and the rear end face of the adjusting core is provided with an oil passage leading to the oil distribution groove.

[0012] Furthermore, the oil injection holes are provided in a plurality of spaced-apart configurations, and the adjusting core controls the number of oil injection holes connected to the oil distribution groove by moving.

[0013] Compared with the prior art, the present invention has the following advantages: The device for automatically adjusting the amount of fuel injection based on temperature is reasonably designed, convenient and practical. By sensing the temperature of the equipment, it dynamically controls the opening of the fuel injection hole to adjust the amount of fuel injection, ensuring that fuel is supplied as needed, avoiding the reduction in efficiency and the risk of liquid slugging caused by excessive fuel under normal working conditions, while ensuring sufficient fuel under harsh working conditions and improving the stability of equipment operation.

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the working state of this utility model embodiment at room temperature; Figure 3 This is a schematic diagram of the working state when the set temperature is reached according to an embodiment of this utility model; Figure 4 This is a schematic diagram of the working state of this utility model embodiment when the temperature exceeds the set temperature; The following are the labels in the diagram: 11-needle valve, 12-temperature sensing housing, 121-connecting groove, 13-first sealing assembly, 14-moving pin, 15-pin seat, 16-temperature sensing liquid, 2-adjusting core, 21-connecting hole, 22-oil passage, return spring, 4-second sealing assembly, 5-machine housing, 51-basic oil injection hole, 52-reinforced lubrication oil injection hole A, 53-reinforced lubrication oil injection hole B. Detailed Implementation

[0016] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] like Figures 1-4 As shown, a device for automatically adjusting the amount of fuel injection based on temperature includes a housing 5. A valve chamber is located on the side of the housing 5. The rear end of the valve chamber is connected to low-temperature lubricating oil, and the front end is connected to the exhaust end of the housing or high-temperature lubricating oil inside the housing. An injection hole is located on the side of the rear end of the valve chamber, connecting to the inside of the housing. An adjusting core 2 is located inside the valve chamber, which adjusts the opening of the injection hole by movement. A temperature sensor is located at the front end of the adjusting core, controlling its movement by sensing temperature. The rear end of the valve chamber is connected to the exhaust end of the housing or the inside of the housing via a pipe, allowing high-temperature gas from the exhaust end or high-temperature lubricating oil from inside the housing to enter the rear end of the valve chamber. This allows the temperature inside the housing to be fed back to the temperature sensor, which controls the movement of the adjusting core based on the temperature reading to adjust the amount of fuel injection.

[0019] In this embodiment, the temperature sensor includes a temperature sensing housing 12, and the temperature sensing housing 12 has a cavity inside. The cavity is filled with a temperature sensing liquid 16. A movable pin 14 is provided through the front side of the temperature sensing housing 12, which can slide back and forth relative to it and whose rear end extends into the cavity. This allows the temperature sensing liquid to expand when heated, pushing the movable pin 14 to slide forward and then pushing the adjusting core to move backward to increase the opening of the fuel injection hole.

[0020] In this embodiment, the temperature-sensing housing 12 has a mounting hole extending through the rear end of the cavity, and a needle valve 11 is installed in the mounting hole. The needle valve 11 ensures that the temperature-sensing housing 12 is filled with the temperature-sensing liquid 16 when the temperature-sensing liquid is filled, and removes excess air as much as possible; after the temperature-sensing liquid 16 is filled, pushing the movable pin opens the needle valve, and pushing the movable pin 14 in discharges excess air and temperature-sensing liquid 16 from the cavity.

[0021] In this embodiment, the temperature-sensing housing 12 is made of aluminum (or copper alloy) with high thermal conductivity. The diameter of the cavity is more than three times the diameter of the movable pin. This allows the expansion of the temperature-sensing liquid to increase the stroke of the movable pin by a square multiple, ensuring sufficient stroke for the overall temperature sensor while reducing its overall size. The temperature-sensing liquid 16 is a liquid with a flocculent point below -60°C at normal pressure and an evaporation point above 200°C (e.g., ethanol-acetone mixture, ethanol-kerosene mixture, modified kerosene, etc.), ensuring the temperature sensor can be used over an extremely wide temperature range.

[0022] In this embodiment, the temperature-sensing housing 12 has a pin seat 15 at the front of the cavity. The movable pin passes through and is disposed in the middle of the pin seat 15 and can slide back and forth relative to it. The front end face of the temperature-sensing housing 12 abuts against the front end of the valve cavity, and the rear end of the movable pin retracts into the rear end face of the temperature-sensing housing. A set distance is left between the rear end face of the movable pin and the rear end face of the temperature-sensing housing, i.e. Figure 2 The value of S is calculated by converting the volume difference after liquid expansion at 70℃ and 25℃ into the amount of movement. This distance S is used to ensure that before the temperature reaches the design temperature (e.g., 70℃), although the movable pin moves, it does not exceed the end face of the temperature-sensing housing, and at this time it does not play an adjustment role. When the ambient temperature is higher than the design temperature, the temperature-sensing liquid 16 continues to expand, pushing the movable pin 14 to continue moving. At this time, the movable pin exceeds the end face of the temperature-sensing housing, and the adjustment role begins. The front end of the movable pin has a head that is stuck on the front side of the pin seat 15 to limit the maximum distance the movable pin can be pushed in. When the rear end face of the head contacts the front end face of the pin seat 15, the distance between the rear end face of the movable pin and the rear end face of the temperature-sensing housing is the set distance S.

[0023] Meanwhile, the needle valve design enhances safety. When the ambient temperature of the temperature sensor significantly exceeds the design temperature, i.e., the maximum allowable temperature (e.g., 110°C), to ensure safety, after assembly, open the needle valve and simultaneously slightly pull the movable pin 4, moving the front end of the movable pin 14 to a distance of 0.9 times S from the front end of the temperature sensing housing, allowing a small amount of air to be contained within the temperature sensing housing, and then close the needle valve.

[0024] In this embodiment, the pin seat 15 is provided with a first sealing component 13 located on the outer periphery of the movable pin.

[0025] In this embodiment, the regulating core is provided with a second sealing component 4 in the middle, which divides the valve cavity into a high-temperature zone and a low-temperature zone that are isolated from each other.

[0026] In this embodiment, a reset spring 3 is sleeved on the front of the regulating core 2 to push the regulating core forward and reset it; the reset spring 3 is used to ensure that the regulating core is reset to the initial position when the ambient temperature of the temperature sensor returns to a low temperature state, thus ensuring the reliability of the regulating oil flow.

[0027] In this embodiment, the front end of the adjusting core is provided with an annular retaining ring, which divides the high-temperature zone of the valve chamber into a high-temperature front chamber and a high-temperature rear chamber. The front end of the return spring abuts against the annular retaining ring, and the rear end abuts against the hole in the inner wall of the high-temperature rear chamber. The front end face of the adjusting core 2 has a connecting channel 21 that penetrates the front side of the adjusting core and communicates with the high-temperature rear chamber. The rear end face of the temperature sensing housing 12 abuts against the front end face of the adjusting core 2, and the rear end side of the temperature sensing housing has a connecting groove 121 that connects the high-temperature front chamber and the front end of the connecting channel. The high-temperature front chamber and the high-temperature rear chamber are connected by the connecting channel and the connecting groove, which ensures that both sides of the annular retaining ring of the adjusting core are in a high-temperature and high-pressure environment. This greatly reduces the resistance of the movable pin reset, thereby reducing the size and specifications of the return spring 3.

[0028] In practice, the regulating core and the temperature sensor can be integrated, and the overall structure of the device can be swapped.

[0029] In this embodiment, the outer side of the housing 5 is provided with an oil inlet hole communicating with the rear end of the valve chamber, the rear side of the adjusting core is provided with an oil distribution groove for communicating with the oil injection hole, and the rear end face of the adjusting core is provided with an oil passage 22 leading to the oil distribution groove.

[0030] In this embodiment, three injection holes are provided and spaced apart: a basic injection hole 51, a reinforced lubrication injection hole 52, and a reinforced lubrication injection hole 53. The adjusting core controls the number of injection holes connected to the distribution groove by movement; the more injection holes connected to the distribution groove, the larger the opening. In specific implementations, the number of injection holes can also be two or four; alternatively, the injection hole can be configured as a single elongated slot structure, and the opening can be controlled by the different lengths of the overlapping sections of the distribution groove and the elongated slot type injection hole.

[0031] This temperature-sensitive automatic oil injection quantity adjustment device can be applied not only to compressors, but also to other equipment that requires oil injection lubrication and cooling.

[0032] The working process of this temperature-sensing automatic fuel injection quantity adjustment device: (1) Temperature sensor inactive stage: When the ambient temperature of the temperature sensor has not reached the design temperature T1, as the temperature rises, the distance between the rear end face of the movable pin and the rear end face of the temperature sensing housing gradually decreases, but the front end face of the movable pin 14 does not exceed the front end face of the temperature sensing housing 12, such as Figure 2 As shown; when the ambient temperature of the temperature sensor reaches the design temperature T1, the front end face of the movable pin 14 is flush with the front end face of the temperature sensing housing 12, as... Figure 3 As shown; at this stage, the oil distribution groove is only connected to the basic oil injection hole 51, and only the basic lubricating oil hole supplies oil to the inside of the housing.

[0033] (2) Temperature sensor working stage: When the ambient temperature of the temperature sensor exceeds the design temperature T1 (e.g., 70°C), as the temperature of the temperature sensor rises, the front end of the movable pin 14 slowly extends out of the front end face of the temperature sensing housing 12, pushing the adjustment core backward in the opposite direction, thereby increasing the number of oil injection holes connected to the oil distribution groove on the adjustment core; when the temperature reaches the set maximum allowable temperature T2 (e.g., 110°C), at this time, all the oil injection holes are connected to the oil distribution groove, and the oil injection volume reaches the maximum.

[0034] (3) When the ambient temperature of the temperature sensor exceeds the set maximum allowable temperature T2, a small amount of air is stored inside the cavity of the temperature sensor, which ensures that although the temperature-sensing liquid will continue to expand, the air is compressible, ensuring sufficient volume to contain the temperature-sensing liquid, thus ensuring the safety of the temperature sensor.

[0035] The design temperature T1 is 60~80℃, and the maximum allowable temperature T2 is 100~120℃.

[0036] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0037] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0038] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0039] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A device for automatically adjusting fuel injection quantity based on temperature sensing, characterized in that: The device includes a housing, and a valve chamber is provided on the side of the housing. The rear end of the valve chamber is connected to low-temperature lubricating oil, and the front end is connected to the exhaust end of the housing or high-temperature lubricating oil inside the housing. The rear end of the valve chamber is provided with an oil injection hole that connects to the inside of the housing. An adjusting core is provided in the valve chamber to adjust the opening of the oil injection hole by moving it. A temperature sensor is provided at the front end of the adjusting core in the valve chamber to control the movement of the adjusting core by sensing the temperature.

2. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 1, characterized in that: The temperature sensor includes a temperature sensing housing with an internal cavity containing a temperature-sensing liquid. A movable pin is provided through the front side of the temperature sensing housing, which can slide back and forth relative to the cavity and whose rear end extends into the cavity. This allows the temperature-sensing liquid to expand when heated, pushing the movable pin forward and then pushing the adjusting core backward to increase the opening of the fuel injection hole.

3. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 2, characterized in that: The temperature sensing housing has a mounting hole that extends through the rear end of the cavity, and a needle valve is installed in the mounting hole; the diameter of the cavity is more than three times the diameter of the movable pin.

4. The device for automatically adjusting the fuel injection quantity based on temperature sensing according to claim 2, characterized in that: The temperature sensing housing has a pin seat at the front of the cavity. The movable pin passes through the middle of the pin seat and can slide back and forth relative to it. The front end face of the temperature sensing housing abuts against the front end of the valve cavity. The rear end of the movable pin retracts into the rear end face of the temperature sensing housing. A set distance is left between the rear end face of the movable pin and the rear end face of the temperature sensing housing.

5. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 4, characterized in that: The pin seat is equipped with a first sealing component located on the outer periphery of the movable pin.

6. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 2, characterized in that: The regulating core is provided with a second sealing component in the middle, which divides the valve cavity into a high-temperature zone and a low-temperature zone that are isolated from each other.

7. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 6, characterized in that: The front part of the adjusting core is fitted with a reset spring for pushing the adjusting core forward to reset; the front end of the adjusting core is provided with an annular retaining ring, which divides the high-temperature zone of the valve chamber into a high-temperature front chamber and a high-temperature rear chamber. The front end of the reset spring abuts against the annular retaining ring, and the rear end abuts against the inner wall of the high-temperature rear chamber. The front end face of the adjusting core has a connecting channel that passes through the front side of the adjusting core and communicates with the high-temperature rear chamber. The rear end face of the temperature sensing housing abuts against the front end face of the adjusting core. The rear end side of the temperature sensing housing has a connecting groove that connects the high-temperature front chamber and the front end of the connecting channel.

8. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 1, characterized in that: The outer side of the housing is provided with an oil inlet hole that communicates with the rear end of the valve chamber. The rear side of the adjusting core is provided with an oil distribution groove for connecting the oil injection hole. The rear end face of the adjusting core is provided with an oil passage leading to the oil distribution groove.

9. The device for automatically adjusting fuel injection quantity based on temperature sensing according to claim 8, characterized in that: The oil injection holes are provided in a number and are distributed at intervals. The adjusting core controls the number of oil injection holes connected to the oil distribution groove by moving.

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