Plunger pump

Abstract

The present application relates to the technical field of oil and gas extraction, and discloses a plunger pump. The plunger pump comprises a pull rod, a crosshead, a bearing shell, a connecting rod, and a measurement member. One end of the pull rod is fixedly connected to the crosshead, the other end of the crosshead is connected to the connecting rod, and the bearing shell is disposed between the crosshead and the connecting rod. The crosshead is provided with a measurement hole, and one end of the measurement hole extends to an end face of one end of the crosshead facing the bearing shell. The measurement member measures the temperature of the bearing shell by means of the measurement hole.

Description

plunger pump

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202423227814.7, filed on December 25, 2024, entitled "Plunger Pump", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of oil and gas extraction technology, specifically relating to a plunger pump. Background Technology

[0004] During oil and gas extraction, the working pressure of the plunger pump used for fracturing operations is increasing. With the corresponding increase in connecting rod load, the working stress on the crosshead bearing also gradually increases. Under these conditions, if any of the following factors—machining accuracy, assembly process, or lubrication—is problematic, the crosshead bearing is highly susceptible to bearing failure. Because current plunger pumps lack the capability to detect bearing failure, bearings that have already failed are often used as normal components, potentially leading to further damage to the plunger pump and severely impacting normal operations. Summary of the Invention

[0005] This application discloses a plunger pump, which includes a pull rod, a crosshead, a bearing, a connecting rod, and a detection element. One end of the pull rod is fixedly connected to the crosshead, and the other end of the crosshead is connected to the connecting rod. The bearing is disposed between the crosshead and the connecting rod. The crosshead has a detection hole, one end of which extends to the end face of the crosshead facing the bearing. The detection element detects the temperature of the bearing through the detection hole. Attached Figure Description

[0006] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0007] Figure 1 is a cross-sectional schematic diagram of a portion of the structure of the plunger pump disclosed in an embodiment of this application, including the crosshead.

[0008] Figure 2 is an enlarged view of a portion of the structure shown in Figure 1;

[0009] Figure 3 is a partial cross-sectional view of another structure of the plunger pump disclosed in the embodiment of this application;

[0010] Figure 4 is an enlarged view of a portion of the structure shown in Figure 3;

[0011] Figure 5 is a cross-sectional schematic diagram of a portion of the piston pump including the connecting rod disclosed in an embodiment of this application;

[0012] Figure 6 is a schematic diagram of the support mechanism in the plunger pump disclosed in the embodiment of this application;

[0013] Figure 7 is a cross-sectional schematic diagram of the support mechanism in the plunger pump disclosed in the embodiments of this application.

[0014] Reference numerals: 1-Pull rod, 2-Cross head, 3-Bearing bush, 4-Connecting rod, 5-Detection component, 6-Housing shell, 7-Cover, 8-Battery, 9-Wireless transmission module, 10-Strain gauge, 11-Support mechanism, 111-Base, 112-Extrusion component, 113-Modible pin, 114-Positioning column. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0017] This application discloses a plunger pump that can detect the temperature of the bearing shell 3 to determine its working state and promptly detect any bearing shell burn-out, preventing further damage to the plunger pump. As shown in Figures 1-7, the plunger pump includes a pull rod 1, a crosshead 2, a bearing shell 3, a connecting rod 4, and a detection element 5. Of course, the plunger pump may also include other components and mechanisms such as a plunger; for the sake of brevity, they will not be described in detail here.

[0018] Among them, the pull rod 1, crosshead 2 and connecting rod 4 serve as power transmission devices for the power end and hydraulic end of the plunger pump. One end of the pull rod 1 is fixedly connected to the crosshead 2, and the other end of the crosshead 2 is connected to the connecting rod 4. Thus, as the connecting rod 4 rotates with the power end, the rotational driving force can be converted into a linear driving force through the crosshead 2 and transmitted to the pull rod 1, so as to drive the plunger to make linear motion through the pull rod 1. In conjunction with other components in the plunger pump, the pumping of liquid is completed.

[0019] The connecting rod 1 and the crosshead 2 are typically fixedly connected by bolts or other fasteners. To ensure proper switching of the drive direction, a bearing 3 is installed between the crosshead 2 and the connecting rod 4, covering the end of the connecting rod 4 closest to the crosshead 2. During the operation of the piston pump, to ensure high operational stability and compatibility between the connecting rod 4 and the bearing 3, lubricating oil is usually filled between them to form an oil film, ensuring relatively high stability in their fit.

[0020] In order to obtain the working status of the bearing 3, in this embodiment of the application, the crosshead 2 is provided with a detection hole, and one end of the detection hole extends to the end face of the crosshead 2 facing the bearing 3. In this case, the bearing 3 is in a communication state with the detection hole, so that the detection element 5 can detect the temperature of the bearing 3 through the detection hole, and determine the working status of the bearing 3 through the temperature of the bearing 3. In this way, when the bearing 3 burns out, the situation can be detected in time, and the piston pump can be prevented from being damaged further due to the bearing 3 burning out.

[0021] Specifically, the detection element 5 can be a temperature sensor. In one specific embodiment of this application, the detection element 5 can be installed inside the detection hole, and the temperature of the bearing 3 can be detected by making the detection head of the detection element 5 directly contact the bearing 3. Of course, in other embodiments of this application, the temperature of the bearing 3 can also be indirectly obtained by the temperature of the lubricating oil flowing into the detection hole.

[0022] This application discloses a plunger pump, in which one end of a pull rod 1 is fixedly connected to a crosshead 2, and the other end of the crosshead 2 is connected to a connecting rod 4. A bearing 3 is provided between the crosshead 2 and the connecting rod 4. When the end of the connecting rod 4 away from the crosshead 2 rotates under the drive of the power end, the rotational drive action is converted into a linear drive action by the crosshead 2, and transmitted to the pull rod 1 by the crosshead 2, thereby causing the crosshead 2 to drive the pull rod 1 to perform linear reciprocating motion. Furthermore, in the plunger pump disclosed in this application, the crosshead 2 is provided with a detection hole, one end of which extends to the end face of the crosshead 2 facing the bearing 3. In this case, the detection element 5 can detect the temperature of the bearing 3 through the detection hole, thereby determining the working state of the bearing 3 by the temperature of the bearing 3. If the bearing 3 burns out, the detection result of the detection element 5 can also be used to obtain the aforementioned situation in a timely manner, thereby controlling the plunger pump to stop and replacing the bearing 3, preventing the plunger pump from being further damaged by the bearing 3 continuing to work.

[0023] As described above, the detection element 5 can be a temperature sensor. In another embodiment of this application, the detection element 5 can also be a temperature and pressure sensor. That is, the detection element 5 has the ability to detect both temperature and pressure. In this case, the detection element 5 disclosed in this application can also detect the lubrication pressure at the position opposite to the detection hole in the bearing 3, thereby comprehensively judging the working state of the bearing 3 by considering the specific conditions of the two parameters, temperature and pressure. This can further improve the accuracy of judging the working state of the bearing 3. In addition, by detecting the lubrication pressure at the position opposite to the detection hole in the bearing 3, it is also possible to prevent the bearing 3 from burning out due to insufficient lubrication pressure.

[0024] As described above, the temperature of the bearing bush 3 can be directly detected through the detection hole. Therefore, in a specific embodiment of this application, as shown in Figures 1 and 2, the axial direction of the detection hole can be tilted relative to the axial direction of the tie rod 1. In this case, the detection hole can avoid the tie rod 1, so that the end of the detection hole away from the bearing bush 3 extends to the end face of the crosshead 2 facing the tie rod 1. That is, the detection hole is positioned to penetrate the crosshead 2, and the detection hole is kept as far away as possible from the main structure of the tie rod 1, that is, the part of the tie rod 1 that mainly bears tensile and thrust forces. In this case, the detection element 5 can be sealed and installed inside the detection hole, allowing the detection head of the detection element 5 to extend through the detection hole to the bearing bush 3, and to detect the temperature of the bearing bush 3 by contacting it. This ensures that the detection results of the detection element 5 are relatively accurate.

[0025] Specifically, a detection hole can be formed on the crosshead 2 by drilling or other methods, and the detection hole can be inclined through the crosshead 2. Correspondingly, after the detection hole is processed, the detection element 5 is installed in the detection hole. Of course, in order to prevent the presence of the detection hole from damaging the lubrication seal inside the plunger pump, the detection element 5 and the detection hole are in a sealing fit relationship. Specifically, a sealing ring or other device can be fitted on the outer periphery of the detection element 5 so that the detection hole can be resealed.

[0026] As described above, the detection hole is inclined relative to the tie rod 1. In order to minimize the processing difficulty of the detection hole and make the fit between the detection part 5 and the bearing 3 more closely, in a specific embodiment of this application, the axial direction of the detection hole can be as close as possible to the straight line where the axis of the tie rod 1 is located. In this case, in order to ensure that the axial direction of the detection hole does not extend to the main body of the tie rod 1 that mainly bears the tension and thrust, the axial direction of the detection hole can be extended to the end of the tie rod 1. The end of the tie rod 1 is the part that forms a fixed connection between the tie rod 1 and the crosshead 2. It usually extends outside the aforementioned main body of the tie rod 1, and bolts and other connecting parts are also installed at the end of the tie rod 1.

[0027] In addition, in the plunger pump disclosed in the embodiments of this application, in order to ensure that the detection element 5 can transmit the detected parameters to the outside of the plunger pump normally, it is also necessary to use wired or wireless communication to establish a communication connection between the detection element 5 and the control center or other external components of the plunger pump. For this purpose, devices such as battery 8 and wireless communication module can be installed in the detection hole.

[0028] Considering that the size of devices such as the battery 8 and the wireless communication module is usually relatively large, in order to make the size of the detection hole relatively small and minimize the adverse impact of the setting of the detection hole on the overall structural reliability of the crosshead 2, in another embodiment of this application, a through hole can also be provided at the end of the pull rod 1, and the through hole is provided through the end of the pull rod 1. By making the through hole and the detection hole interconnected, devices such as the battery 8 and the communication module can be installed outside the pull rod 1 and the crosshead 2, and the cable can be interconnected with the detection element 5 inside the detection hole through the through hole. This allows the size of the detection hole to be relatively small, and can also greatly reduce the difficulty of sealing the detection hole.

[0029] Similarly, a perforation can also be formed at the end of the tie rod 1 by drilling. Of course, during the process of forming the perforation, the extension direction of the detection hole needs to be designed to ensure that the axes of the detection hole and the perforation are collinear as much as possible, thereby improving the connection between the two.

[0030] Based on the above embodiments, the detection component 5 can also be powered by an external power source. Correspondingly, the detection results of the detection component 5 can be transmitted in real time to devices such as a control center via a cable. To further improve the operational convenience of the plunger pump, in another embodiment of this application, the plunger pump can also include a battery 8 and a wireless transmission module 9. By electrically connecting both the detection component 5 and the wireless transmission module 9 to the battery 8, the battery 8 can supply power to both the detection component 5 and the wireless transmission module 9. Correspondingly, by making the detection component 5 communicatively connected to the wireless transmission module 9, the detection results of the detection component 5 can be transmitted via the wireless transmission module 9 to a corresponding receiving module such as a control center, ensuring that the detection results of the detection component 5 can be obtained promptly by personnel or an automatic control center. Of course, the plunger pump can also include a wireless receiving module, or a wireless transceiver module with both transmitting and receiving capabilities. This allows the detection component 5 to receive control commands sent by a transmitting module such as a control center via the receiving module, and enables the detection component 5 to perform real-time detection based on the aforementioned control commands.

[0031] Specifically, both the battery 8 and the wireless transmission module 9 can be fixedly mounted on the pull rod 1 or the crosshead 2 using screws or other connectors. To further improve the stability of the battery 8 and the wireless transmission module 9, in one specific embodiment of this application, a protective shell may also be included, with both the battery 8 and the wireless transmission module 9 installed inside the protective shell to protect them. Optionally, the protective shell is installed on the crosshead 2. Considering the relatively complex operation of the crosshead 2, in one specific embodiment of this application, the protective shell can be fixedly connected to the end of the pull rod 1 on the side opposite to the crosshead 2. In this case, on the one hand, the connection distance between the battery 8 and the detection element 5 can be shortened, and on the other hand, the protective shell can protect the perforation on the pull rod 1, preventing external particles from entering the detection hole through the perforation and damaging the detection element 5.

[0032] More specifically, the protective case may include a housing 6 and a cover 7, wherein the housing 6 and the cover 7 are detachably fixedly connected and can form a sealed state after being connected to each other. The battery 8 and the wireless transmission module 9 can both be installed inside the housing 6 and covered by the cover 7.

[0033] In order to reduce the installation difficulty of the detection component 5 and to minimize the impact of the setting of the detection hole on the structure and sealing of the crosshead 2, in another embodiment of this application, as shown in Figures 3 and 4, the detection component 5, the battery 8 and the wireless transmission module 9 can all be installed inside the protective housing 6.

[0034] In this case, in order to ensure that the detection component 5 can still detect the temperature of the bearing bush 3 normally, the detection hole can be connected to the weight reduction hole of the tie rod 1. That is, the detection hole is still set through the crosshead 2, and the other end of the detection hole extends into the area where the weight reduction hole of the tie rod 1 is located. More specifically, the detection hole can be set in the center of the crosshead 2, and the axis of the detection hole can be parallel to the axis of the tie rod 1. This makes the overall size of the detection hole relatively small, thereby greatly reducing the degree of adverse impact of the detection hole on the structural reliability of the crosshead 2.

[0035] Based on this, the protective shell can be fixedly installed in the weight-reduction hole of the tie rod 1. To ensure that the detection element 5 installed inside the protective shell can normally detect the temperature of the bearing bush 3 through the detection hole, in this embodiment, one end of the protective shell can be provided with an insert cylinder. Of course, the insert cylinder can be integrally formed with the shell 6 of the protective shell to improve the connection reliability between the shell 6 and the insert cylinder. During the installation of the protective shell, one end of the insert cylinder is embedded in the detection hole, and the insert cylinder is connected to the detection hole. Of course, the other end of the insert cylinder is also connected to the inner cavity of the shell 6, so that the detection element 5 installed inside the protective shell can be positioned opposite to the other end of the insert cylinder, thereby achieving the purpose of detecting the temperature of the bearing bush 3 through the insert cylinder and the detection hole. It should be noted that in this embodiment, the detection element 5 indirectly detects the temperature of the bearing bush 3 by measuring the temperature of the lubricating oil flowing through the detection hole into the insert cylinder. Accordingly, in this embodiment, the detection element 5 may also have the ability to detect pressure, so as to obtain the pressure of the lubricating oil at the position opposite to the detection hole in the bearing 3 by the pressure of the lubricating oil flowing into the insert cylinder.

[0036] Based on the plunger pump disclosed in any of the above embodiments, a high-precision pressure sensor can be installed at the discharge end of the plunger pump to monitor the working pressure in the hydraulic end working chamber. By observing the changes in the working pressure, it can be determined whether parts such as valve bodies, valve seats, valve springs, spring seats, suction glands, discharge glands, and packings in the plunger pump are damaged, thereby ensuring that the plunger pump can operate as stably as possible.

[0037] However, when using the above technical solution, the sensor needs to be in direct contact with the high-pressure working medium, which increases the risk of leakage. In addition, the sensor is installed at the convergence point of the drain end, which cannot reflect the pressure of each cylinder of the plunger pump. Correspondingly, if the sensor fails, the pressure in all cylinders cannot be obtained normally. Furthermore, the sensor needs to be an ultra-high pressure resistant sensor, which is relatively expensive.

[0038] Therefore, in another embodiment of this application, as shown in FIG5, the plunger pump may further include a strain monitoring component. The strain monitoring component can determine the intracavitary pressure at the hydraulic end by detecting the deformation of the tie rod 1 under load. Specifically, in this embodiment, the strain monitoring component includes a strain gauge 10. By fitting the strain gauge 10 in contact with the tie rod 1, the deformation of the tie rod 1 can be acquired by the strain gauge 10 and displayed as a strain signal. As described above, the strain gauge 10 and the tie rod 1 cooperate with each other. To protect the strain monitoring component and prevent other factors from affecting the detection accuracy of the strain gauge 10, in this embodiment, the strain monitoring component is installed inside the weight-reducing hole of the tie rod 1. Furthermore, considering that the load on the tie rod 1 is usually relatively large, the strain gauge 10 can be powered internally, and the detection information of the strain gauge 10 can be transmitted to the outside of the plunger pump via wireless communication.

[0039] Therefore, the strain monitoring component also includes a battery 8 and a wireless transmission module 9. Both the strain gauge 10 and the wireless transmission module 9 are electrically connected to the battery 8, and the strain gauge 10 is communicatively connected to the wireless transmission module 9, enabling the strain information detected by the strain gauge 10 to be transmitted to a control center via the wireless transmission module 9. Similarly, the strain monitoring component may also include a wireless receiving module, or it may include a wireless transceiver module with both transmitting and receiving capabilities to receive control commands sent by a control center, enabling the strain gauge 10 to perform real-time detection of the deformation of the tie rod 1 based on the control commands. Specifically, the battery 8 and the wireless transmission module 9 can be fixedly installed in the weight-reduction hole of the tie rod 1 using adhesive or screws or other connectors.

[0040] In another embodiment of this application, the strain monitoring component further includes a support mechanism 11, which includes a base 111, a pusher 112, and a movable pin 113. As shown in Figures 6 and 7, the base 111 is provided with a threaded hole and a movable hole that communicate with each other. The threaded hole is recessed at one end of the base 111. The pusher 112 is threadedly connected to the threaded hole. The battery 8 is fixedly installed at the other end of the base 111. The other end of the movable hole extends to the side of the base 111. The movable pin 113 is movably disposed within the movable hole. One of the side wall of the pusher 112 and the end face of the movable pin 113 is provided with a pusher slope so that when the pusher 112 rotates relative to the base 111, a portion of the movable pin 113 is driven to extend out of the movable hole and engage with the weight reduction hole.

[0041] As described above, the support mechanism 11 provides support and fixation for the battery 8. For the wireless transmission module 9, since its size and weight are generally relatively small, installation via bonding or other methods can generally ensure a relatively stable assembly relationship with the pull rod 1. In this embodiment, the support mechanism 11 may have multiple movable holes and multiple movable pins 113, with the movable holes evenly and spaced along the circumference of the base 111, i.e., around the axial direction of the weight-reducing holes. One end of each movable hole communicates with a threaded hole, and the other end extends to the side of the base 111. By installing the multiple movable pins 113 one-to-one into the multiple movable holes, the pushing member 112 can simultaneously drive the multiple movable pins 113 during rotation relative to the base 111, causing a portion of each movable pin 113 to extend outside the movable hole and engage with the weight-reducing hole. In this case, the assembly stability between the support mechanism 11 and the pull rod 1 can be improved, thereby enhancing the installation stability of the battery 8.

[0042] More specifically, the end of the movable pin 113 facing away from the extrusion member 112 can be a spherical structure. This ensures a good interference fit between the movable pin 113 and the extrusion member 112 while reducing the installation difficulty of the support mechanism 11. Additionally, a guide groove can be provided on the side of the base 111, and a guide strip can be provided on the inner wall of the weight-reducing hole to guide and limit the installation of the support mechanism 11 into the weight-reducing hole, preventing the support mechanism 11 from rotating relative to the weight-reducing hole. Furthermore, a positioning pin 114 can be provided at the end of the base 111 where the threaded hole is located, and a positioning hole can be provided at a corresponding position on the inner wall of the tie rod 1. After the support mechanism 11 is installed in place, it can be further positioned with the tie rod 1 via the positioning pin 114, preventing the support mechanism 11 from rotating.

[0043] In the above embodiments, the plunger pump can be a single-cylinder structure. In other embodiments of this application, the plunger pump can also be a multi-cylinder structure. In this case, a detection hole can be provided on only one crosshead 2, and a detection element 5 can be installed accordingly. Correspondingly, a strain monitoring component can also be installed on only one tie rod 1.

[0044] In other embodiments of this application, when the plunger pump has a multi-cylinder structure, there are multiple crossheads 2, bearings 3, and detection elements 5. Each crosshead 2 is provided with a detection hole, and multiple crossheads 2 correspond one-to-one with multiple bearings 3. Multiple detection elements 5 detect the temperature of the corresponding bearings 3 through multiple detection holes. This can ensure that the temperature of the bearing 3 between each crosshead 2 and the corresponding connecting rod 4 can be detected individually by the corresponding detection element 5, so as to ensure that the working status of each bearing 3 can be obtained in a timely manner.

[0045] Accordingly, when the plunger pump has a multi-cylinder structure, there are multiple tie rods 1, and each tie rod 1 is equipped with a strain monitoring component in its weight reduction hole. The load of multiple tie rods 1 can be detected by multiple strain monitoring components, thereby obtaining the pressure in each cylinder of the plunger pump and ensuring that the overall working stability of the plunger pump is relatively higher.

[0046] As described above, the detection element 5 and strain gauge 10 can be powered by a built-in battery 8 or by an external power source. In other embodiments of this application, a power generation device can also be provided to provide a continuous power supply for the detection element 5 and strain gauge 10. The power generation device can generate electricity using the pressure of lubricating oil; or it can generate electricity using the reciprocating motion of the crosshead 2 and the pull rod 1 or the rotational motion of the crankshaft; or it can generate electricity using the suction effect of the crosshead 2 on gas.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0048] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plunger pump, comprising a tie rod, a crosshead, a bearing, a connecting rod, and a sensing element, wherein, One end of the pull rod is fixedly connected to the crosshead, the other end of the crosshead is connected to the connecting rod, and the bearing bush is provided between the crosshead and the connecting rod; The crosshead is provided with a detection hole, one end of which extends to the end face of the crosshead facing the bearing bush. The detection element detects the temperature of the bearing bush through the detection hole.

2. The plunger pump according to claim 1, wherein, The detection element is also used to detect the lubrication pressure at the position in the bearing bush opposite to the detection hole.

3. The plunger pump according to claim 1, wherein, The detection hole is inclined relative to the axis of the tie rod, and the end of the detection hole away from the bearing extends to the end face of the crosshead facing the tie rod. The detection element is sealed and installed inside the detection hole.

4. The plunger pump according to claim 3, wherein, The end of the pull rod is provided with a through hole, which is provided through the end of the pull rod and is connected to the detection hole.

5. The plunger pump according to claim 4, wherein, It also includes a protective case, a battery, and a wireless transmission module. The protective case is fixedly connected to the end of the pull rod on the side opposite to the crosshead. The battery and the wireless transmission module are both installed inside the protective case. The detection element and the wireless transmission module are both electrically connected to the battery, and the detection element is communicatively connected to the wireless transmission module.

6. The plunger pump according to claim 1, wherein, It also includes a protective shell, a battery, and a wireless transmission module. The detection hole is connected to the weight reduction hole of the pull rod. The protective shell is fixedly installed in the weight reduction hole of the pull rod. One end of the protective shell is provided with an embedding tube. One end of the embedding tube is embedded in the detection hole, and the embedding tube is connected to the detection hole. The detection element, the battery, and the wireless transmission module are all installed inside the protective shell. The detection element is positioned opposite to the other end of the embedded tube. The detection element and the wireless transmission module are both electrically connected to the battery, and the detection element is communicatively connected to the wireless transmission module.

7. The plunger pump according to claim 1, wherein, The number of crossheads, bearings, and detection elements are all multiple. Each crosshead is provided with a detection hole. The multiple crossheads correspond one-to-one with the multiple bearings. The multiple detection elements detect the temperature of the corresponding bearings through the multiple detection holes.

8. The plunger pump according to claim 1, wherein, The pull rod is provided with a weight reduction hole, and the plunger pump also includes a strain monitoring component disposed in the weight reduction hole. The strain monitoring component includes a strain gauge, a battery and a wireless transmission module. The strain gauge is fitted to the pull rod, and both the strain gauge and the wireless transmission module are electrically connected to the battery. The strain gauge is communicatively connected to the wireless transmission module.

9. The plunger pump according to claim 8, wherein, The strain monitoring assembly further includes a support mechanism, which comprises a base, a pusher, and a movable pin. The base has a threaded hole and a movable hole that communicate with each other. The threaded hole is recessed at one end of the base. The pusher is threadedly connected to the threaded hole. The battery is fixedly installed at the other end of the base. The other end of the movable hole extends to the side of the base. The movable pin is movably disposed within the movable hole. One of the side wall of the pusher and the end face of the movable pin has a pusher slope, so that when the pusher rotates relative to the base, a portion of the movable pin is driven to extend out of the movable hole and engage with the weight reduction hole.

10. The plunger pump according to claim 8, wherein, There are multiple tie rods, and each tie rod has a strain monitoring component installed in its weight reduction hole.

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