A plunger structure, a fracturing pump and a method for monitoring the working temperature of the plunger structure

Abstract

The present invention provides a plunger structure, a fracturing pump and a method for monitoring the working temperature of the plunger structure, wherein the plunger structure comprises a plunger body and a temperature sensor, wherein the plunger body is provided with a first groove and a second groove, wherein the notch of the first groove is located at the side wall of the second groove, and the temperature sensor is arranged in the first groove. The present invention has the following beneficial effects: when the plunger temperature can be detected, the influence on the normal operation of the fracturing pump is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum equipment, and in particular to a plunger structure, a fracturing pump and a method for monitoring the working temperature of the plunger structure. Background Art

[0002] In oil and gas fracturing operations, fracturing pumps are usually in high-pressure, high-intensity working conditions. The plunger is a key structure of the hydraulic end of the fracturing pump and is easily damaged. During operation, the plunger is subjected to long-term friction, which will cause a relatively high temperature on its surface. If the plunger temperature is too high during operation and no timely measures are taken, it will lead to safety accidents during the fracturing operation.

[0003] In the related art, a temperature sensor is set to be fixedly connected to the outer wall of the plunger to measure the temperature of the outer wall of the plunger. However, this setting method of the temperature sensor usually changes the external structure of the plunger and the structure of the hydraulic end of the fracturing pump, thereby affecting the normal operation of the fracturing pump. Summary of the invention

[0004] The problem solved by the present invention is how to reduce the influence on the normal operation of a fracturing pump when the plunger temperature can be detected.

[0005] To solve the above problems, the present invention provides a plunger structure, including a plunger body and a temperature sensor, wherein the plunger body is provided with a first groove and a second groove, the notch of the first groove is located at the side wall of the second groove, and the temperature sensor is arranged in the first groove.

[0006] The plunger structure in the technical solution, by providing a first groove for installing a temperature sensor on the plunger body, can reduce the impact of changes in the external structure on the operating state of the plunger structure and reduce the impact on the operation of the fracturing pump, compared to connecting the temperature sensor on the outer surface of the plunger body and setting a fixed bracket for fixing the temperature sensor. In addition, since the temperature sensor is installed in the first groove inside the plunger body by providing a first groove connected to the second groove, the concealment of the temperature sensor installation position can be improved, and compared to connecting the temperature sensor on the outer surface of the plunger body and setting a fixed bracket for fixing the temperature sensor, it can also prevent the on-site construction personnel from operating the temperature sensor incorrectly, thereby preventing the temperature sensor from being affected, resulting in a loss of the temperature measurement function.

[0007] Furthermore, the plunger structure also includes a limiting structure, which is detachably arranged at the first groove, and is suitable for abutting against the temperature sensor.

[0008] The plunger structure in the present technical solution includes a limiting structure, which can be installed in the first groove, so as to limit the installation position of the temperature sensor to ensure the stability of the installation of the temperature sensor.

[0009] Further, the limiting structure is suitable for moving towards or away from the bottom of the first groove.

[0010] The plunger structure and the limiting structure of the present technical solution can move at the first groove when installed at the first groove, so as to adjust the detection distance of the temperature sensor and thus ensure the accuracy of temperature detection, and facilitate the disassembly and assembly of the temperature sensor.

[0011] Furthermore, a first thread structure is disposed on the outer periphery of the limiting structure, and a second thread structure cooperating with the first thread structure is disposed on the inner wall of the first groove.

[0012] Further, the axis of the first groove is perpendicular to the axis of the second groove, or the axis of the first groove is inclined relative to the axis of the second groove, wherein the inclination direction is a direction away from the notch of the second groove.

[0013] In the plunger structure of the present technical solution, the axis of the first groove is perpendicular to the axis of the second groove, that is, the first groove is perpendicular to the second groove, so as to facilitate the installation of the limiting structure at the first groove. In addition, the axis of the first groove is inclined relative to the axis of the second groove, and the inclination direction is away from the notch of the second groove. Specifically, when the second groove is set horizontally, the first groove can be in a form of left inclination relative to the horizontal, so as to facilitate the insertion of the sensor from the second groove into the first groove, and then facilitate the installation and fixation of the sensor.

[0014] Furthermore, a minimum distance between the bottom of the first groove and the outer wall of the plunger body is greater than or equal to 4 mm and less than or equal to 12 mm.

[0015] Furthermore, the center line of the second groove coincides with the center line of the plunger body, and the plunger structure further comprises a supporting structure, which is detachably disposed in the second groove and is suitable for abutting against an inner wall of the second groove.

[0016] In the plunger structure of the present technical solution, the center line of the second groove coincides with the center line of the plunger body. Therefore, the groove form of the second groove is a groove extending from the middle of the side surface of the plunger body toward the periphery, thereby minimizing the influence of the second groove on the structural strength of the plunger body. In addition, the plunger structure also includes a supporting structure. Therefore, after the temperature sensor is installed, the supporting structure can be inserted into the second groove, so that the supporting structure can abut against the inner wall of the second groove, thereby supporting the second groove, and then providing structural support to the plunger body, thereby improving the structural strength of the plunger structure and prolonging the service life of the plunger structure.

[0017] Further, the support structure includes a connecting block and a plurality of retractable legs arranged around the outer circumference of the connecting block, a plurality of slide grooves are provided on the inner wall of the second groove, the slide grooves include a first groove extending along the length direction of the plunger body and a second groove extending along the circumference of the plunger body, the first groove is connected to the second groove, the retractable leg is suitable for sliding in the first groove and the second groove, when the retractable leg slides to the end of the second groove away from the first groove, the retractable leg is in a retracted state, and the retractable leg abuts against the bottom of the second groove.

[0018] In the plunger structure of the present technical solution, the telescopic legs can slide in the direction of the groove bottom or groove opening of the second groove based on each first groove, and when sliding from the first groove to the connecting point of the second groove and the first groove, they can change to slide in the second groove. Since the second groove extends circumferentially relative to the plunger body, the support structure can rotate in the second groove at this time. When it rotates to the end of the second groove away from the first groove, the telescopic legs are in a contracted state, so that the telescopic legs in the contracted state abut against the groove bottom of the second groove, thereby abutting and supporting the inner wall of the second groove, and then supporting the plunger body after the groove is opened, thereby improving the structural strength of the plunger body. Since the telescopic legs of the support structure slide along the first groove to the second groove, the telescopic legs can be abutted by the side wall of the second groove in the length direction of the plunger body, so that when the plunger structure moves, the support structure can be prevented from falling out, thereby improving the structural stability of the plunger structure.

[0019] The present invention also provides a fracturing pump, comprising the plunger structure as described above.

[0020] Furthermore, the fracturing pump further comprises a signal receiving device and a temperature display device communicatively connected to the signal receiving device, and the signal receiving device is communicatively connected to the temperature sensor of the plunger structure.

[0021] The beneficial effects of the fracturing pump in the present technical solution are similar to those of the above-mentioned plunger structure, and will not be described in detail here.

[0022] The present invention also proposes a method for monitoring the working temperature of a plunger structure. Based on the plunger structure as described above, the method for monitoring the working temperature of the plunger structure comprises:

[0023] Obtain temperature values ​​obtained by the temperature sensor during multiple working cycles;

[0024] Calculating an average of a plurality of said temperature values;

[0025] Determining the outer surface temperature of the plunger structure according to the average value and a preset temperature coefficient;

[0026] Whether the operating temperature of the plunger structure is normal is determined based on the outer surface temperature.

[0027] Furthermore, the working temperature monitoring method of the plug structure further comprises: determining the actual outer surface temperature of the plunger structure in a plurality of the working cycles according to the preset temperature coefficient and the plurality of temperature values;

[0028] The step of judging whether the working state of the plunger structure is normal according to the outer surface temperature includes:

[0029] When the outer surface temperature is greater than or equal to a first preset temperature, and there are a first preset number of actual outer surface temperatures greater than or equal to the first preset temperature, it is determined that the operating temperature of the plunger structure is abnormal.

[0030] The working temperature monitoring method of the plunger structure in the present technical solution has similar beneficial effects to the above-mentioned plunger structure, and can monitor the working temperature of the plunger structure more reasonably and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the radial cross section of the plunger structure in the embodiment of the present invention Figure 1 ;

[0032] Figure 2 Schematic diagram of the radial cross section of the plunger structure in the embodiment of the present invention Figure 2 ;

[0033] Figure 3 Schematic diagram of the radial cross section of the plunger structure in the embodiment of the present invention Figure 3 ;

[0034] Figure 4 is a side view of the plunger structure in an embodiment of the present invention;

[0035] Figure 5 A schematic cross-sectional view of the plunger structure in an embodiment of the present invention Figure 1 ;

[0036] Figure 6 A schematic cross-sectional view of the plunger structure in an embodiment of the present invention Figure 2 ;

[0037] Figure 7 A schematic cross-sectional view of the plunger structure in an embodiment of the present invention Figure 3 ;

[0038] Figure 8 Schematic diagram of the radial cross section of the plunger structure in the embodiment of the present invention Figure 4 ;

[0039] Fig. 9 Flow chart of a method for monitoring the working temperature of a plunger structure in an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1- plunger body; 2- temperature sensor; 3- center line; 4- limit structure; 5- support structure; 101- first groove; 102- second groove; 122- slide groove; 501- connection block; 502- telescopic leg; 1221- first channel; 1222- second channel. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0046] Reference Figure 1 and 2 As shown, a plunger structure of an embodiment of the present invention includes a plunger body 1 and a temperature sensor 2. The plunger body 1 is provided with a first groove 101 and a second groove 102. The notch of the first groove 101 is located at the side wall of the second groove 102. The temperature sensor 2 is arranged in the first groove 101.

[0047] In oil and gas fracturing operations, fracturing pumps are usually in high-pressure, high-intensity working conditions. The plunger is a key structure of the hydraulic end of the fracturing pump and is easily damaged. During operation, the plunger is subjected to long-term friction, which will cause a relatively high temperature on its surface. If the plunger temperature is too high during operation and no timely measures are taken, it will cause safety accidents during the fracturing operation. In the related art, a temperature sensor is set to be fixedly connected to the outer wall of the plunger, so as to measure the temperature of the outer wall of the plunger. However, this setting method of the temperature sensor usually changes the external structure of the plunger and the structure of the hydraulic end of the fracturing pump, thereby affecting the normal operation of the fracturing pump.

[0048] The plunger structure of the embodiment of the present invention can be applied to a fracturing pump. The plunger structure includes a plunger body 1, such as Figure 1 and 2The plunger body 1 is roughly cylindrical in shape, and also includes a temperature sensor 2. The temperature sensor 2 is used to detect the temperature of the plunger body 1 when it is working. The plunger body 1 is provided with a first groove 101 and a second groove 102. The opening of the second groove 102 is located on the outer surface of the plunger body 1. In this embodiment, the second groove 102 is a roughly cylindrical groove with a diameter of 30-50 mm and a depth of 100 mm at the core position of the pressure-bearing end of the plunger body 1. In addition, the notch of the first groove 101 is located at the second groove 102, so that the first groove 101 is connected with the second groove 102, wherein the first groove 101 is used to install the temperature sensor 2, so that the temperature sensor 2 can detect the temperature of the plunger body 1. In a specific embodiment, the bottom of the first groove 101 is close to the outer wall of the plunger body 1, so that when the temperature sensor 2 is arranged at the first groove 101, the outer surface of the rubbed plunger body 1 can be more directly measured. At this time, the first groove 101 is a groove opened in the second groove 102 toward the outer wall of the plunger body 1. The inner diameter of the first groove 101 can be consistent with the outer diameter of the temperature sensor 2, or slightly larger than the temperature sensor 2, to facilitate the installation of the temperature sensor 2. When installing the temperature sensor 2, the temperature sensor 2 is sent from the second groove 102 to the first groove 101 by a tool, and then the temperature sensor 2 is installed.

[0049] The plunger structure described in this embodiment, by providing a first groove 101 for installing the temperature sensor 2 on the plunger body 1, can reduce the impact of external structural changes on the operating state of the plunger structure and reduce the impact on the operation of the fracturing pump, compared with connecting the temperature sensor 2 on the outer surface of the plunger body 1 and setting a fixed bracket for fixing the temperature sensor 2. In addition, it can be understood that since the temperature sensor 2 is installed in the first groove 101 inside the plunger body 1 by the first groove 101 connected to each other, the temperature sensor 2 is installed in the first groove 101 inside the plunger body 1, so that the concealment of the installation position of the temperature sensor 2 can be improved, and compared with connecting the temperature sensor 2 on the outer surface of the plunger body 1 and setting a fixed bracket for fixing the temperature sensor 2, it can also avoid the on-site construction personnel from misoperating and affecting the temperature sensor 2, thereby causing the loss of the temperature measurement function.

[0050] Among them, the temperature sensor 2 can be a wireless induction temperature sensor, which can transmit the detected temperature to the corresponding signal receiving device through a wireless signal and can display the temperature. In a fracturing pump or a fracturing pump system of the present invention, it includes a signal receiving device and a temperature display device communicatively connected to the signal receiving device. The signal receiving device is communicatively connected to the temperature sensor 2 to receive the temperature information detected by the temperature sensor and to display the temperature information.

[0051] In addition, the fracturing pump or the fracturing pump system may further include an alarm device, which may be communicatively connected with the signal receiving device, so that an alarm may be issued when the detected temperature is greater than a preset value.

[0052] In an optional embodiment of the present invention, the minimum distance between the bottom of the first groove 101 and the outer wall of the plunger body 1 is greater than or equal to 4 mm and less than or equal to 12 mm.

[0053] Reference Figure 1 As shown, the minimum distance between the bottom of the first groove 101 and the outer wall of the plunger body 1, that is, the distance between the bottom of the first groove 101 and the outer wall closest to the plunger body 1, is as shown in FIG. Figure 1 The spacing L in the middle has a value within the range of 4-12 mm, preferably within the range of 5-10 mm, so as to form the first groove 101. When the temperature sensor 2 is located in the first groove 101 for temperature measurement, it can be closer to the outer wall of the plunger body 1, so that the measured temperature corresponds to the temperature of the outer wall, thereby facilitating a more intuitive measurement of the outer wall temperature. In addition, the spacing also has a certain thickness, so as to ensure a good structural strength of the plunger body 1 while forming the first groove, thereby ensuring the service life of the plunger body 1.

[0054] In an optional embodiment of the present invention, the plunger structure further includes a limiting structure 4 , which is detachably disposed at the first groove 101 , and is suitable for abutting against the temperature sensor 2 .

[0055] Reference Figure 2 and 3 As shown, in this embodiment, the plunger structure includes a limiting structure 4, which can be installed in the first groove 101, so as to limit the installation position of the temperature sensor 2 to ensure the stability of the installation of the temperature sensor 2.

[0056] The limiting structure 4 can specifically be a plugging structure. After the temperature sensor 2 is set in the first groove 101, the notch of the first groove 101 is sealed by the plugging structure to support and limit the temperature sensor 2, thereby ensuring the installation stability of the temperature sensor 2 and further improving the concealment of the installation position of the temperature sensor 2.

[0057] In an optional embodiment of the present invention, the limiting structure 4 is suitable for moving towards or away from the bottom of the first groove 101 .

[0058] In this embodiment, when the limiting structure 4 is installed in the first groove 101, it can move in the first groove 101. Figure 1-3As shown, it can specifically move in the up and down directions of the first groove 101, and during the movement, due to the abutment with the temperature sensor 2, the position of the temperature sensor 2 in the first groove 101 can be adjusted. Specifically, when the limiting structure 4 moves upward, that is, moves toward the bottom of the groove close to the first groove 101, the temperature sensor 2 is pushed to move toward the bottom of the first groove 101. When the limiting structure 4 moves downward, that is, moves toward the bottom of the groove away from the first groove 101, the limiting structure 4 is separated from the temperature sensor 2, so that the temperature sensor 2 can move downward, thereby adjusting the detection distance of the temperature sensor 2 to ensure the accuracy of temperature detection and facilitate the disassembly and assembly of the temperature sensor 2.

[0059] In an optional embodiment of the present invention, a first thread structure is disposed on the outer periphery of the limiting structure 4 , and a second thread structure matching with the first thread structure is disposed on the inner wall of the first groove 101 .

[0060] In this embodiment, the outer periphery of the limiting structure 4 and the inner wall of the first groove 101 are respectively provided with a first thread structure and a second thread structure, so as to realize the detachable connection between the limiting structure 4 and the first groove 101 and the movable and adjustable form of the limiting structure 4 and the first groove 101. It can be understood that by rotating the limiting structure 4, the limiting structure 4 can be moved toward or away from the bottom of the first groove 101, and the position after the movement can be maintained. The threaded connection method is also convenient for the limiting structure 4 to be moved, controlled and disassembled. It can be understood that corresponding slots can be set at the limiting structure 4, such as internal hexagonal and external hexagonal slots, so as to facilitate the installation, disassembly and adjustment of related tooling.

[0061] In an optional embodiment of the present invention, the axis of the first groove 101 is perpendicular to the axis of the second groove 102, or the axis of the first groove 101 is inclined relative to the axis of the second groove 102, wherein the inclination direction is the direction away from the notch of the second groove 102.

[0062] In this embodiment, the opening direction of the second groove 102 is parallel to the horizontal plane and horizontally faces rightward. Specifically, refer to Figure 1-3 As shown, in a specific embodiment of the present invention, the axis of the second groove 102 is its center line 3, which is parallel to the horizontal plane. Correspondingly, the opening direction of the first groove 101 is vertically downward, and the opening direction of the second groove 102 is horizontally rightward. At this time, the axis of the first groove 101 is perpendicular to the axis of the second groove 102. At this time, the first groove 101 is a substantially vertical groove structure, which facilitates the installation of the limiting structure 4. In another embodiment, refer to Figure 8As shown, the first groove 101 can be a groove structure that is offset to the left and is in an inclined form. Specifically, the axis of the first groove 101 is inclined relative to the axis of the second groove 102, wherein the inclination direction is the direction away from the notch of the second groove 102. By opening the inclined first groove 101, it is convenient to insert the temperature sensor 2 into the first groove 101, thereby facilitating the installation of the temperature sensor 2.

[0063] In an optional embodiment of the present invention, the center line of the second groove 102 coincides with the center line of the plunger body 1, and the plunger structure also includes a supporting structure 5, which is detachably arranged in the second groove 102, and the supporting structure 5 is suitable for abutting against the inner wall of the second groove 102.

[0064] In this embodiment, the cross section of the second groove 102 is roughly circular, so the second groove 102 is roughly a cylindrical structure, wherein the plunger body 1 is usually a cylindrical structure, or has a cylindrical structure portion. At this time, the center line of the second groove 102 coincides with the center line of the plunger body 1, that is, Figure 1 The center line 3, thus, the groove form of the second groove 102 is a groove extending from the middle of the side surface of the plunger body 1 to the periphery, so as to minimize the influence of the second groove 102 on the structural strength of the plunger body 1. In addition, the plunger structure also includes a supporting structure 5, so that after the temperature sensor 2 is installed, the supporting structure 5 can be inserted into the second groove 102, so that the supporting structure 5 can abut against the inner wall of the second groove 102, so as to support the second groove 102, and then provide structural support to the plunger body 1, so as to improve the structural strength of the plunger structure and increase the service life of the plunger structure.

[0065] In an optional embodiment of the present invention, the support structure 5 includes a connecting block 501 and a plurality of retractable legs 502 arranged around the outer periphery of the connecting block 501, a plurality of slide grooves 122 are provided on the inner wall of the second groove 102, the slide groove 122 includes a first groove 1221 extending along the length direction of the plunger body 1 and a second groove 1222 extending along the circumference of the plunger body 1, the first groove 1221 is connected to the second groove 1222, the retractable leg 502 is suitable for sliding in the first groove 1221 and the second groove 1222, when the retractable leg 502 slides to the end of the second groove 1222 away from the first groove 1221, the retractable leg 502 is in a retracted state, and the retractable leg 502 abuts against the bottom of the second groove 1222.

[0066] Reference Figure 3-7As shown, in this embodiment, the support structure 5 includes a connecting block 501 and a plurality of telescopic legs 502 arranged around the outer periphery of the connecting block 501, and the plurality of telescopic legs 502 are used to abut and support multiple positions of the inner wall of the second groove 102, wherein the telescopic legs 502 may include a structural part made of an elastic material, or a structural part including a spring, etc., so as to perform adaptive deformation and expansion, and a plurality of slide grooves 122 are provided on the inner wall of the second groove 102 to correspond to the plurality of telescopic legs 502, and one end of the telescopic leg 502 slides in the slide groove 122, wherein the slide groove 122 includes a first groove 1221 extending along the length direction of the plunger body 1, thereby the plurality of telescopic legs 502 can slide toward the groove bottom or groove direction of the second groove 102 based on each first groove 1221, and at the same time, the slide groove 122 includes a first groove 1221 extending along the circumference of the plunger body 1 The second groove 1222 extends, and the second groove 1222 is connected to the first groove 1221, so that when the telescopic leg 502 slides at the first groove 1221 to the connecting point of the second groove 1222 and the first groove 1221, it can change to slide at the second groove 1222. Since the second groove 1222 extends circumferentially relative to the plunger body 1, the support structure 5 can rotate in the second groove 102 at this time, that is, rotate along the sliding of the second groove 1222. When it rotates to the end of the second groove 1222 away from the first groove 1221, the telescopic leg 502 is in a retracted state, so that the telescopic leg 502 in the retracted state abuts against the bottom of the second groove 1222, thereby abutting and supporting the inner wall of the second groove 102, and then supporting the plunger body 1 after the groove is opened, thereby improving the structural strength of the plunger body 1. Since the telescopic legs 502 of the support structure 5 slide along the first groove 1221 to the second groove 1222, the telescopic legs 502 can be abutted by the side walls of the second groove 1222 in the length direction of the plunger body 1, thereby preventing the support structure 5 from falling out when the plunger structure moves, thereby improving the structural stability of the plunger structure.

[0067] Among them, the second groove 1222 can be set to a structural form in which the end away from the first groove 1221 protrudes relative to the end close to the first groove 1221, so that when the telescopic leg 502 slides along the second groove 1222, the telescopic leg 502 can adaptively contract, so that after being in the contracted state, it abuts against the bottom of the second groove 1222, that is, it abuts against the inner wall of the second groove 102.

[0068] A fracturing pump according to another embodiment of the present invention includes the plunger structure as described above.

[0069] The fracturing pump may further include a signal receiving device and a temperature display device communicatively connected to the signal receiving device, wherein the signal receiving device is communicatively connected to the temperature sensor 2 of the plunger structure.

[0070] Furthermore, the fracturing pump may further include an alarm device, which is communicatively connected to the signal receiving device.

[0071] Therefore, the fracturing pump described in the embodiment of the present invention has similar beneficial effects to those of the above plunger structure, and it can receive and display the temperature detected by the temperature sensor 2, and issue an alarm according to the temperature conditions.

[0072] Reference Fig. 9 As shown, a working temperature monitoring method of a plunger structure according to another embodiment of the present invention is based on the above plunger structure, and the working temperature monitoring method of the plunger structure includes:

[0073] S1, obtaining temperature values ​​obtained by the temperature sensor 2 in multiple working cycles;

[0074] S2, calculating the average value of a plurality of temperature values;

[0075] S3, determining the outer surface temperature of the plunger structure according to the average value and a preset temperature coefficient;

[0076] S4. Determine whether the operating temperature of the plunger structure is normal according to the outer surface temperature.

[0077] The working temperature monitoring method of the plunger structure described in the present invention is based on the above-mentioned plunger structure. When the fracturing pump drives the plunger structure to work, real-time detection is performed through the temperature sensor 2 in the first groove 101, and specifically, the temperature values ​​in multiple working cycles are detected. Since the temperature sensor 2 is located in the first groove 101, the temperature value detected by it may be different from the outer surface temperature value of the plunger structure. Therefore, on the one hand, the working state of the plunger structure in multiple working cycles is evaluated according to the average value of the multiple temperature values ​​to avoid misjudgment, and the outer surface temperature of the plunger structure in multiple working cycles is determined according to the average value and the preset temperature coefficient, such as the product of the average value and the preset temperature, so as to more accurately evaluate the outer surface temperature of the plunger structure. Therefore, whether the working temperature of the plunger structure is normal is judged according to the outer surface temperature, so that the working temperature of the plunger structure can be monitored more reasonably.

[0078] Among them, when the outer surface temperature is greater than a preset temperature, it can be judged that the working temperature of the plunger structure is abnormal, and then an indication instruction for indicating the abnormality can be generated to the alarm device, such as being sent to the alarm device of the above-mentioned fracturing pump with a plunger structure to issue an alarm so that the operator can handle it in time.

[0079] In addition, the working temperature monitoring method of the plunger structure also includes: generating an instruction for displaying a plurality of the temperature values ​​and / or the outer surface temperature, and sending the instruction to a display device, such as sending the instruction to the temperature display device of the fracturing pump with the plunger structure, so as to display the temperature value and / or the outer surface temperature.

[0080] In an optional embodiment of the present invention, the operating temperature monitoring method of the plunger structure further comprises determining the actual outer surface temperature of the plunger structure in a plurality of the working cycles according to the preset temperature coefficient and the plurality of temperature values;

[0081] The step of judging whether the working state of the plunger structure is normal according to the outer surface temperature includes:

[0082] When the outer surface temperature is greater than or equal to a first preset temperature, and there are a first preset number of actual outer surface temperatures greater than or equal to the first preset temperature, it is determined that the operating temperature of the plunger structure is abnormal.

[0083] In the present embodiment, when judging whether the working state of the plunger structure is normal according to the outer surface temperature, the judgment is specifically made through the outer surface temperature and the actual outer surface temperature in multiple working cycles, wherein the actual outer surface temperature is determined by a preset temperature coefficient and a temperature value in each working cycle. Thus, when the outer surface temperature is greater than a first preset temperature, and there are a first preset number of values ​​greater than the first preset temperature among the multiple actual outer surface temperatures, it indicates that the outer surface temperature of the plunger structure is relatively high in multiple working cycles, thereby judging that the working temperature of the plunger structure is abnormal. Thus, the monitoring of the working temperature of the plunger structure is more reasonable and accurate.

[0084] In an optional embodiment, judging whether the working state of the plunger structure is normal according to the outer surface temperature further includes:

[0085] When the outer surface temperature is greater than the second preset temperature and less than the first preset temperature, and there are a second preset number of real-time surface temperatures greater than the third preset temperature, it is judged that the working temperature of the plunger structure is abnormal, wherein the third preset temperature is greater than the first preset temperature, and the second preset number is less than the first preset number.

[0086] In this embodiment, if the outer surface temperature representing the average temperature is small, but in each working cycle, there is a second preset number of real-time surface temperatures, and the temperature values ​​of these real-time surface temperatures are large, it indicates that the plunger structure has some extreme working conditions. At this time, it is judged that the working temperature of the plunger structure is abnormal, and the monitoring of the working temperature of the plunger structure is more reasonable and accurate.

[0087] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A plunger structure, characterized in that: The invention comprises a plunger body (1) and a temperature sensor (2), wherein the plunger body (1) is provided with a first groove (101) and a second groove (102), the notch of the first groove (101) is located at the side wall of the second groove (102), and the temperature sensor (2) is arranged in the first groove (101); The axis of the first groove (101) is perpendicular to the axis of the second groove (102), or the axis of the first groove (101) is inclined relative to the axis of the second groove (102), wherein the inclination direction is a direction away from the notch of the second groove (102); The center line of the second groove (102) coincides with the center line of the plunger body (1); the plunger structure further comprises a support structure (5), the support structure (5) is detachably arranged in the second groove (102), and the support structure (5) is suitable for abutting against the inner wall of the second groove (102); The support structure (5) comprises a connecting block (501) and a plurality of retractable legs (502) arranged around the outer periphery of the connecting block (501); a plurality of slide grooves (122) are arranged on the inner wall of the second groove (102); the slide grooves (122) comprise a first groove (1221) extending along the length direction of the plunger body (1) and a second groove (1222) extending along the circumference of the plunger body (1); the first groove (1221) is connected to the second groove (1222); the retractable legs (502) are suitable for sliding in the first groove (1221) and the second groove (1222); when the retractable legs (502) slide to an end of the second groove (1222) away from the first groove (1221), the retractable legs (502) are in a retracted state, and the retractable legs (502) abut against the groove bottom of the second groove (1222).

2. The plunger structure according to claim 1, characterized in that: It also comprises a limiting structure (4), wherein the limiting structure (4) is detachably arranged at the notch of the first groove (101), and the limiting structure (4) is suitable for abutting against the temperature sensor (2).

3. The plunger structure according to claim 2, characterized in that: The limiting structure (4) is suitable for moving in a direction close to or away from the bottom of the first groove (101).

4. The plunger structure according to claim 3, characterized in that: The outer periphery of the limiting structure (4) is provided with a first thread structure, and the inner wall of the first groove (101) is provided with a second thread structure that cooperates with the first thread structure.

5. A fracturing pump, characterized in that: The invention comprises the plunger structure as described in any one of claims 1 to 4.

6. A method for monitoring the working temperature of a plunger structure, characterized in that: Based on the plunger structure according to any one of claims 1 to 4, the working temperature monitoring method of the plunger structure comprises: Obtaining temperature values ​​obtained by the temperature sensor (2) during multiple working cycles; Calculating an average of a plurality of said temperature values; Determining the outer surface temperature of the plunger structure according to the average value and a preset temperature coefficient; Whether the operating temperature of the plunger structure is normal is determined based on the outer surface temperature.

7. The method for monitoring the working temperature of a plunger structure according to claim 6, characterized in that: Also includes: Determining the actual outer surface temperature of the plunger structure in a plurality of the working cycles according to the preset temperature coefficient and the plurality of temperature values; The determining whether the working temperature of the plunger structure is normal according to the outer surface temperature comprises: When the outer surface temperature is greater than or equal to a first preset temperature, and there are a first preset number of actual outer surface temperatures greater than or equal to the first preset temperature, it is determined that the operating temperature of the plunger structure is abnormal.

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