CN216714781U

CN216714781U - Device capable of flexibly adjusting blade tip clearance of cooling fan

Info

Publication number: CN216714781U
Application number: CN202122864950.7U
Authority: CN
Inventors: 徐威; 王跃康; 崔瑞; 黄勇; 王永; 郑朋磊; 于得洋; 张运鹏
Original assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Current assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-06-10
Anticipated expiration: 2031-11-22

Abstract

The utility model discloses a device capable of flexibly adjusting blade tip clearance of a cooling fan, belonging to the technical field of hydraulic excavators; an annular support is fixedly arranged in the fan cover, a plurality of through holes with internal threads are uniformly formed in the side wall of the annular support, and each through hole is correspondingly provided with a bolt; the tail end of the bolt is abutted against the outer wall of the air guide ring; the laser ranging device is fixed at the center of the end face of the main shaft of the fan, the laser ranging probe is electrically connected with the signal transmitter, and the signal transmitter is connected with the controller. The cooling fan provided by the utility model realizes real-time monitoring of the blade tip distance between the fan blade and the air guide ring through a simple electronic adjusting mechanism, has a simple and flexible adjusting mode, and effectively avoids abrasion caused by friction between the fan blade and the fan cover (the air guide ring).

Description

Device capable of flexibly adjusting blade tip clearance of cooling fan

Technical Field

The utility model belongs to the technical field of hydraulic excavators, and particularly relates to a device capable of flexibly adjusting blade tip clearance of a cooling fan.

Background

The cooling system is an important component of an engine system of the crawler-type hydraulic excavator, has great influence on the dynamic property, the economical efficiency and the reliability of the engine, and mainly has the function of enabling the engine to be cooled moderately so as to enable the engine to work in an optimum temperature range. At present, most hydraulic excavators adopt a forced circulation type water cooling system which mainly comprises a radiator, a cooling fan, a cooling water jacket, a water pump, a thermostat and the like. Because of the low thermal conductivity of air, the heat dissipation capability of the heat sink is mainly determined by the forced flow of air. Thus, the amount of air passing through the radiator core plays a decisive role. The cooling fan is an essential component of the cooling system, and can increase the flow rate of air flowing through the core of the radiator to improve the heat dissipation capacity of the radiator. Therefore, the performance of the cooling fan directly affects the heat dissipation effect of the engine cooling system, noise, and engine dynamics, fuel economy, and the like.

Gaps, namely blade tip gaps, exist between the fan blades and the fan cover of the large-scale hydraulic excavator. In the process of installing the fan, the main shaft of the fan can not be installed in the right center of the fan cover due to the problems of design, processing or installation precision and the like, so that the blade tip clearance of some parts is too small, and the friction between the fan blades and the fan cover is further caused to generate abrasion; some of the locations are too large, causing air from a high pressure region near the fan to pass through the gap into a low pressure region, resulting in a lower fan efficiency. Therefore, it is necessary to detect and monitor the mounting accuracy of the fan.

At present, in the industry, the main shaft of the fan can be ensured to be positioned at the right center of the fan cover when the fan is installed only by means of design, manufacturing process and the like; the problem of overlarge clearance is solved by adding a coating on the periphery of the fan cover or the blade tip of the fan; the problem of undersize clearance is solved through changing fan casing or fan apex. However, due to problems of field assembly process and design, the fan and the fan cover of the large hydraulic excavator are outsourced parts, and the gap between the fan and the fan cover is large, so that the main shaft of the fan cannot be positioned at the center of the fan cover when the fan is installed.

In the center of the prior art, for example, chinese granted patent CN212535780U provides a blade tip clearance control assembly, a gas turbine engine, and an aircraft, in which a blade tip clearance control assembly including a plurality of adjustable sealing units is provided, and high-temperature brush wires are provided on the adjustable sealing units, so as to prevent the sealing layers from wearing fan blades, and valves can control the actuating cylinders to actuate and contract, thereby adjusting the blade tip clearance. However, the equipment structure is mainly used for high-precision aircraft turbine engines, and the structure is too complex to be suitable for complex working environments of excavators.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a device capable of flexibly adjusting the blade tip clearance of a cooling fan, which is realized by the following technical scheme.

The device capable of flexibly adjusting the tip clearance of the cooling fan comprises a fan cover, the fan and a controller, wherein an annular support is fixedly arranged in the fan cover, a plurality of through holes with internal threads are uniformly formed in the side wall of the annular support, and each through hole is correspondingly provided with a bolt; the tail end of the bolt is abutted to the outer wall of the air guide ring and is fixed through a fixing piece; the fan is positioned inside the air guide ring; the laser ranging assembly is further arranged and fixed at the central part of the end face of the main shaft of the fan through a limiting piece, the laser ranging assembly comprises a signal transmitter and 3-8 laser ranging probes, and all the laser ranging probes uniformly face the inner wall of the air guide ring along the radial direction of the air guide ring; the laser ranging probe is electrically connected with a signal transmitter, and the signal transmitter is connected with the controller.

The cooling fan is specially applied to a heat dissipation part of a large hydraulic excavator, the annular bracket of the cooling fan is fixed on the fan cover, and the air guide ring is positioned in the fan cover; the fan is fixed on the rotating shaft of the motor, and a gap exists between the fan blades of the fan and the air guide ring, namely a blade tip gap. The laser ranging assembly has the advantages that the laser ranging probe can emit laser towards the edge of the air guide ring along the radial direction, the distance between the laser ranging probe and the edge of the air guide ring is further measured, and distance data are transmitted to the controller through the signal transmitter. The signal transmitter can be a wired signal transmission module or an infinite signal transmission module. The controller can be selected from a common computer ECU on the market. When the data measured by the laser ranging probes received by the computer ECU are different and are in a reasonable range (realized by a threshold value preset in the computer ECU), the computer ECU judges that the data are in a safe range; when the received data difference exceeds a reasonable range, the computer ECU judges that the data difference exceeds a safe range, and an alarm is required to remind staff to adjust the position of the air guide ring so as to adjust the blade tip gap width. The number of the laser ranging probes is not less than 3, and the direction of the emitted laser of the probes is uniformly directed to the edge of the air guide ring along the radial direction. The adjusting method of the wind guiding ring is that the bolts at the corresponding parts are rotated clockwise or anticlockwise to enable the wind guiding ring to be finely adjusted in the fan cover. The fixing piece is used for ensuring that the tail end of the bolt is always propped against the outer wall of the air guide ring. The effect of locating part is to guarantee that laser rangefinder subassembly can be accurately fixed at central point. The fixing part and the limiting part have a plurality of structural forms, and all belong to the protection scope of the application as long as corresponding functions can be realized.

Preferably, the fixing piece is a limiting ring fixedly arranged on the outer wall of the air guide ring, and the tail end of the bolt is inserted into the limiting ring. The limiting ring is used as a fixing piece and is used for guiding the tail end of the bolt to be inserted into and abut against the outer wall of the air guide ring.

Preferably, the fixing piece is a limiting groove arranged on the outer wall of the air guide ring, and the tail end of the bolt is inserted into the bottom of the limiting groove. The limiting groove has the same function as the limiting ring, but is a groove arranged on the outer wall of the wind guide ring.

Preferably, the limiting member is an insertion groove formed in the center of the end face of the main shaft of the fan, and the laser distance measuring assembly further includes a first housing or an insertion member, and the first housing or the insertion member is inserted into the insertion groove. The shape of caulking groove and the first casing or the gomphosis piece phase-match of laser rangefinder subassembly, during the laser rangefinder subassembly embedding caulking groove of being convenient for, the purpose is the position of fixed laser rangefinder subassembly. The first shell is a part which plays a role in protecting and coating the outside of the laser ranging assembly, and the embedded part is a part which is additionally arranged and is specially used for being embedded with the embedded groove. The first shell, the embedded part and the embedded groove can be fixed together through a tight fit relation and friction force, and are not easy to separate and fall off.

More preferably, a magnetic part is arranged on the first shell or the embedded part, and a magnetic sheet is arranged in the embedded groove. In order to avoid the falling of the laser ranging component, the first shell or the embedded component can be magnetically attracted in the embedded groove.

Preferably, the limiting part is a fastening device arranged on the laser ranging assembly. The function of buckle is likewise fixed laser rangefinder subassembly in the fixed position of fan main shaft.

More preferably, the structure of the buckle device is specifically as follows: the laser ranging probes are uniformly distributed outside a second shell of the laser ranging assembly, a plurality of elastic pieces are arranged inside the laser ranging assembly, and a plurality of through grooves are uniformly formed in the end face of the laser ranging assembly along the radial direction of the air guide ring; a plurality of clamping jaws are further arranged, one end of each clamping jaw is correspondingly connected with 1 elastic piece, and the other end of each clamping jaw vertically extends out of the end face of the laser ranging assembly from the through groove; the elastic piece is fixed inside the laser ranging assembly. As a concrete structure of the laser ranging assembly, the elastic piece is convenient for driving the clamping jaw to stretch out and draw back and is used for clamping and grabbing the main shaft from the side wall of the main shaft of the fan, and therefore the laser ranging assembly is fixed.

Preferably, the laser ranging assembly comprises 6 laser ranging probes. Generally speaking, 6 laser ranging probes are provided to meet the requirements.

Preferably, the fan cover and the annular bracket are detachably connected or welded.

Compared with the prior art, the utility model has the beneficial effects that: the device capable of flexibly adjusting the blade tip clearance of the cooling fan provided by the utility model realizes real-time monitoring of the blade tip clearance between the fan blade and the air guide ring through a simple electronic adjusting mechanism, has a simple and flexible adjusting mode, and effectively avoids abrasion caused by friction between the fan blade and the fan cover (the air guide ring).

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for flexibly adjusting a tip clearance of a cooling fan according to embodiment 1;

FIG. 2 is a schematic structural diagram of an apparatus for flexibly adjusting the tip clearance of a cooling fan according to embodiment 2 (without a fan cover and a controller);

FIG. 3 is a schematic view of the structure at A of FIG. 2;

FIG. 4 is a rear view of a laser ranging assembly of the apparatus provided in example 2;

FIG. 5 is an internal schematic view of a laser ranging assembly of the apparatus provided in example 2;

fig. 6 is a left side view of the laser ranging assembly of the apparatus provided in example 2 (part of the laser ranging probe is not shown for ease of illustration).

In the figure: 1. a fan housing; 2. a fan; 3. a controller; 4. an annular support; 5. a through hole; 6. a bolt; 7. a wind guide ring; 8. a limiting ring; 9. a laser ranging assembly; 10. a signal transmitter; 11. a laser ranging probe; 12. caulking grooves; 13. a first housing; 14. a limiting groove; 15. a second housing; 16. an elastic member; 17. a through groove; 18. a claw is provided.

Detailed Description

The technical solutions of the embodiments in this patent will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments, of this patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the patent without making creative efforts, shall fall within the protection scope of the patent.

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

The patent is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Example 1

As shown in fig. 1, the device capable of flexibly adjusting the tip clearance of the cooling fan provided in this embodiment includes a fan housing 1, a fan 2, and a controller 3, wherein an annular support 4 is fixedly disposed in the fan housing 1, 8 through holes 5 with internal threads are uniformly disposed on a side wall of the annular support 4, and each through hole 5 is correspondingly provided with a bolt 6; additionally arranging an air guide ring 7, wherein the air guide ring 7 is positioned inside the annular bracket 4, the tail end of the bolt 6 is abutted against the outer wall of the air guide ring 7 and is fixed through a fixing piece, the fixing piece is a limiting ring 8 fixedly arranged on the outer wall of the air guide ring 7, and the tail end of the bolt 6 is inserted into the limiting ring 8; the fan 2 is positioned inside the air guide ring 7; a laser ranging assembly 9 is further arranged and fixed at the central part of the end face of the main shaft of the fan 2 through a limiting piece, the laser ranging assembly 9 comprises a signal transmitter 10 and 8 laser ranging probes 11, and all the laser ranging probes 11 uniformly face the inner wall of the air guide ring 7 along the radial direction of the air guide ring 7; the limiting part is an embedded groove 12 arranged in the center of the end face of the main shaft of the fan 2, the laser ranging assembly 9 further comprises a first shell 13, and the first shell 13 is embedded in the embedded groove 12; the laser ranging probe 11 is electrically connected with a signal transmitter 10, and the signal transmitter 10 is in wired connection with the controller 3 through a data line.

The cooling fan device is specially applied to a heat dissipation part of a large hydraulic excavator, the annular bracket of the cooling fan is fixed on the fan cover, and the air guide ring is positioned in the fan cover; the fan is fixed on the rotating shaft of the motor, and a gap exists between the fan blades of the fan and the air guide ring, namely a blade tip gap. The laser ranging assembly has the advantages that the laser ranging probe can emit laser towards the edge of the air guide ring along the radial direction, the distance between the laser ranging probe and the edge of the air guide ring is further measured, and distance data are transmitted to the controller through the signal transmitter. The signal transmitter can be a wired signal transmission module or an infinite signal transmission module. The controller can be selected from a common computer ECU on the market. When the data measured by the laser ranging probes received by the computer ECU are different and are in a reasonable range (realized by a threshold value preset in the computer ECU), the computer ECU judges that the data are in a safe range; when the received data difference exceeds a reasonable range, the computer ECU judges that the data difference exceeds a safe range, and an alarm is required to remind staff to adjust the position of the air guide ring so as to adjust the blade tip gap width. The number of the laser ranging probes is 8, and the direction of the emitted laser of the probes is uniformly directed to the edge of the air guide ring along the radial direction. The adjusting method of the wind guiding ring is that the bolts at the corresponding parts are rotated clockwise or anticlockwise to enable the wind guiding ring to be finely adjusted in the fan cover. The fixing piece is used for ensuring that the tail end of the bolt is always propped against the outer wall of the air guide ring. The effect of locating part is to guarantee that laser rangefinder subassembly can be accurately fixed at central point. The fixing part and the limiting part have a plurality of structural forms, and all belong to the protection scope of the application as long as corresponding functions can be realized.

Example 2

As shown in fig. 2 to 6, the device for flexibly adjusting the blade tip clearance of the cooling fan according to the present embodiment is different from embodiment 1 in that the fixing member is a limiting groove 14 disposed on the outer wall of the wind guide ring 7, and the end of the bolt 6 is inserted into the bottom of the limiting groove 14.

The limiting part is a fastening device arranged on the laser ranging assembly 9, specifically, the laser ranging probes 11 are uniformly distributed outside a second shell 15 of the laser ranging assembly 9, 8 elastic parts 16 (springs in the drawing of the embodiment) are arranged inside the laser ranging assembly 9, and 8 through grooves 17 are uniformly arranged on the end surface of the laser ranging assembly 9 along the radial direction of the air guide ring 7; 8 clamping jaws 18 are further arranged, one end of each clamping jaw 18 is correspondingly connected with 1 elastic piece 16, and the other end of each clamping jaw 18 vertically extends out of the end face of the laser ranging assembly 9 from the through groove 17; the elastic member 16 is fixed inside the laser ranging assembly 9.

The practice of the present invention is described in detail in the above examples, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the claims and the technical idea of the utility model, a number of simple modifications and changes can be made to the technical solution of the utility model, and these simple modifications are within the scope of protection of the utility model.

Claims

1. A device capable of flexibly adjusting the tip clearance of a cooling fan is characterized by comprising a fan cover, the fan and a controller, wherein an annular support is fixedly arranged in the fan cover, a plurality of through holes with internal threads are uniformly formed in the side wall of the annular support, and each through hole is correspondingly provided with a bolt; the tail end of the bolt is abutted to the outer wall of the air guide ring and is fixed through a fixing piece; the fan is positioned inside the air guide ring; the laser ranging assembly is further arranged and fixed at the central part of the end face of the main shaft of the fan through a limiting piece, the laser ranging assembly comprises a signal transmitter and 3-8 laser ranging probes, and all the laser ranging probes uniformly face the inner wall of the air guide ring along the radial direction of the air guide ring; the laser ranging probe is electrically connected with a signal transmitter, and the signal transmitter is connected with the controller.

2. The device for flexibly adjusting the clearance between the tips of the cooling fans as claimed in claim 1, wherein the fixing member is a limiting ring fixed on the outer wall of the wind guide ring, and the end of the bolt is inserted into the limiting ring.

3. The device capable of flexibly adjusting the clearance between the tips of the cooling fans as claimed in claim 1, wherein the fixing member is a limiting groove disposed on the outer wall of the wind guide ring, and the end of the bolt is inserted into the bottom of the limiting groove.

4. The device for flexibly adjusting the tip clearance of a cooling fan according to claim 1, wherein the limiting member is a recessed groove disposed in a center of a main shaft end surface of the fan, and the laser distance measuring assembly further comprises a first housing or an engaging member, and the first housing or the engaging member is engaged in the recessed groove.

5. The device for flexibly adjusting the clearance between the tips of the cooling fans as claimed in claim 4, wherein the first casing or the engaging member has a magnetic member, and the slot has a magnetic plate.

6. The device for flexibly adjusting the clearance between the tips of the blades of the cooling fan as claimed in claim 1, wherein the position-limiting member is a locking device disposed on the laser ranging assembly.

7. The device capable of flexibly adjusting the clearance between the tips of the cooling fans as claimed in claim 6, wherein the structure of the fastening device is specifically as follows: the laser ranging probes are uniformly distributed outside the second shell of the laser ranging assembly, a plurality of elastic pieces are arranged inside the laser ranging assembly, and a plurality of through grooves are uniformly formed in the end face of the laser ranging assembly along the radial direction of the air guide ring; a plurality of clamping jaws are further arranged, one end of each clamping jaw is correspondingly connected with 1 elastic piece, and the other end of each clamping jaw vertically extends out of the end face of the laser ranging assembly from the through groove; the elastic piece is fixed inside the laser ranging assembly.

8. The device for flexibly adjusting the tip clearance of the cooling fan according to claim 1, wherein the laser ranging assembly comprises 6 laser ranging probes.

9. The device for flexibly adjusting the clearance between the tips of the cooling fans as claimed in claim 1, wherein the fan cover is detachably connected or welded to the annular bracket.