A four-piston pump

Abstract

The application discloses a four-plunger pump and relates to the technical field of plunger pumps. An observation window assembly is arranged at an observation and inspection opening of a side wall of a crankcase of a pump body. A reversible observation window cover plate assembly is assembled through a sliding hinge support hinge. A quick opening lock assembly is arranged in a matched mode. The quick opening lock assembly replaces a traditional full bolt compression fixing structure. The observation window cover plate is quickly locked and reversibly opened and closed without tools. The maintenance and disassembly process is greatly simplified. The equipment operation and maintenance efficiency is improved. Meanwhile, an outer magnetic attraction control structure and an inner sliding execution structure that cooperate with each other are integrated on the reversible observation window cover plate assembly. A non-contact magnetic attraction inner and outer linkage is used to drive a cleaning assembly to move. The glass inner oil stain cleaning operation can be completed without arranging a transmission structure on the cover plate opening and without disassembling the cover plate. The operation sealing property and the working stability of the crankcase are ensured. The convenience of the four-plunger pump daily working condition observation, cleaning maintenance and maintenance operation is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of plunger pump technology, and in particular to four-plunger pumps. Background Technology

[0002] Four-plunger high-pressure plunger pumps are widely used in industrial fields such as high-pressure cleaning, oil and gas transportation, and fluid pressurization. The crankcase, as the core power chamber of the equipment, houses the crankshaft connecting rod mechanism and high-pressure plunger assembly. During operation, it is necessary to monitor the lubricating oil level and the operating status of the transmission components in real time. Therefore, inspection windows are installed on the side walls of the crankcase. Currently, the inspection windows of plunger pumps in the industry generally adopt a locking structure using a cover plate, sealing ring, and multiple sets of clamping bolts. Multi-point bolt tightening achieves a tight seal between the inspection window cover plate and the end face of the crankcase, thus meeting the basic requirements for oil sealing and operational condition visualization within the crankcase.

[0003] However, the existing bolt-pressed observation windows have obvious drawbacks in long-term actual operation and maintenance: First, the disassembly and assembly efficiency is extremely low. Every time the crankshaft connecting rod mechanism is overhauled or the oil condition is inspected, the staff must disassemble and reassemble all the bolts around the window one by one. The number of bolts is large, the disassembly and assembly steps are cumbersome, and the operation is time-consuming, which greatly reduces the efficiency of equipment maintenance. Second, the observation window is difficult to clean and maintain. Oil mist and oil stains generated by the equipment operation can easily adhere to the inside of the flat glass. The existing structure does not have matching cleaning components. If the glass is to be transparent and the observation field is to be restored, the entire observation window cover must be completely disassembled before it can be wiped clean, which is a cumbersome maintenance operation.

[0004] Therefore, this invention proposes a four-plunger pump to solve the above problems. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a four-plunger pump, comprising a pump body crankcase, wherein a maintenance observation port is provided on the side wall of the pump body crankcase, and an observation window assembly is installed at the maintenance observation port. The observation window assembly includes a sliding hinge support fixedly installed on the cover plate mounting surface of the crankcase maintenance observation port and a flip-up observation window cover assembly. The flip-up observation window cover assembly is hingedly mounted on the sliding hinge support, and a quick-release locking assembly is installed at one end of the flip-up observation window cover assembly away from the sliding hinge support. The quick-release locking assembly enables the flip-up observation window cover assembly to be quickly locked and unlocked on the cover plate mounting surface of the pump body crankcase.

[0007] The flip-up viewing window cover assembly is equipped with an outer magnetic attraction control structure and an inner sliding execution structure that cooperate with each other. A cleaning component is installed on the inner sliding execution structure. The inner sliding execution structure is driven by the non-contact magnetic attraction of the outer magnetic attraction control structure to move, thereby moving the cleaning component to clean the inner wall of the flip-up viewing window cover assembly.

[0008] As a preferred embodiment of the four-plunger pump of the present invention, the flip-up observation window cover assembly includes an observation window cover body hinged to a sliding hinge support, the observation window cover body is configured in a box shape, a circular through-hole is provided in the middle of the observation window cover body, and a circular flat glass is glued to the circular through-hole.

[0009] As a preferred embodiment of the four-plunger pump of the present invention, in one specific implementation, two sets of the outer magnetic attraction control structure are symmetrically arranged on the left and right sides of the circular flat glass, respectively. The outer magnetic attraction control structure includes two outer mounting plates mounted on the outer mounting surface of the crankcase cover plate. The two outer mounting plates are supported by a sliding guide rail of the housing base. A cover plate magnetic locking anti-slip seat is slidably mounted on the sliding guide rail of the housing base plate.

[0010] As a preferred embodiment of the four-plunger pump of the present invention, the inner sliding actuation structure is symmetrically arranged in two sets, and the two sets of inner sliding actuation structures are respectively arranged on the left and right sides of the circular flat glass, and correspond to the positions.

[0011] The inner sliding actuator includes an inner mounting plate installed on the inner mounting surface of the crankcase cover. The inner mounting plates are supported and mounted with built-in sliding guide rails. Glass magnetic positioning slides are slidably mounted on the built-in sliding guide rails.

[0012] In a preferred embodiment of the four-plunger pump of the present invention, the cleaning component is configured as a U-shaped frame plate, the two ends of the U-shaped frame plate are configured and installed on two glass magnetic positioning slides arranged on the left and right, the upper part extends protruding to form a protruding structure that contacts the inner side line of the crankcase cover plate, the U-shaped frame plate is integrally arranged across the inner side area of ​​the circular flat glass, and the inner side plate of the U-shaped frame plate is arranged in contact with the inner side wall of the circular flat glass.

[0013] As a preferred embodiment of the four-plunger pump of the present invention, wherein: a glass sealing buffer strip is glued to the end face of the observation window cover plate body facing the crankcase cover plate mounting surface; a housing sealing base frame is installed on the cover plate mounting surface of the pump body crankcase; and a housing end face sealing frame is glued to the top of the housing sealing base frame.

[0014] As a preferred embodiment of the four-plunger pump of the present invention, the U-shaped frame plate has two concave oil collection grooves on the side facing the main body of the observation window cover plate. The concave oil collection grooves are continuous groove structures, and one side of the concave oil collection grooves is connected to the inclined surface of the protruding structure.

[0015] As a preferred embodiment of the four-plunger pump of the present invention, wherein: the cover plate magnetic locking anti-slip seat is installed on the sliding guide rail of the box base facing the observation window cover plate body, and is arranged with a gap between it and the observation window cover plate body;

[0016] The glass magnetic positioning slide is installed on the built-in sliding guide rail of the observation window cover plate, facing the main body of the observation window cover plate, and is arranged with a gap between it and the main body of the observation window cover plate.

[0017] As a preferred embodiment of the four-plunger pump of the present invention, the quick-release locking assembly includes a locking fixing seat, an elastic flip-up buckle, and a limiting block. The locking fixing seat is fixedly embedded on the cover plate mounting surface of the pump body crankcase. The elastic flip-up buckle is hingedly assembled on the locking fixing seat. The limiting block is fixedly installed on the outer end face of the flip-up observation window cover plate assembly and corresponds to and matches the position of the elastic flip-up buckle.

[0018] In a preferred embodiment of the four-plunger pump of the present invention, the length of the U-shaped frame plate is greater than the diameter of the flat glass.

[0019] The beneficial effects of this invention are:

[0020] By installing a sliding hinge support and a flip-up observation window cover assembly with a hinged fit at the crankcase inspection port, and matching it with a quick-opening latch assembly to replace the traditional all-bolt clamping and fixing structure, the observation window cover can be quickly locked and flipped open and closed without tools. This eliminates the tedious process of disassembling and assembling each bolt individually, significantly reducing the difficulty of maintenance operations, shortening equipment downtime, and effectively improving equipment maintenance efficiency. At the same time, by integrating a cooperating outer magnetic attraction control structure and an inner sliding actuation structure on the flip-up observation window cover assembly, relying on a non-contact magnetic attraction internal and external linkage method, The drive cleaning component moves to clean the cover plate and the inner wall of the glass. The entire process does not require a transmission structure to be set in the opening of the cover plate, and the oil and mist on the inside of the glass can be cleaned without disassembly without disassembling the observation window assembly. This avoids the drawback of traditional structures that require the removal of the cover plate to clean oil stains, protects the overall structural integrity of the cover plate, and effectively solves the problems of inconvenient cleaning of oil stains on the inside of the observation glass and easy obstruction of the field of vision. Under the premise of ensuring the sealing of the crankcase observation window assembly and the stability of equipment operation, it significantly improves the overall convenience and practicality of daily operation observation, cleaning maintenance and equipment inspection of the four-plunger pump. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall appearance and structure of a traditional four-plunger pump;

[0023] Figure 2 This is a schematic diagram of the assembly structure of the crankcase and observation window assembly in this invention;

[0024] Figure 3 This is a schematic diagram of the assembly structure of the flip-up observation window cover plate in this invention;

[0025] Figure 4 This is a schematic diagram of the magnetic attraction of the outer magnetic attraction control structure and the inner sliding execution structure in this invention;

[0026] Figure 5 This is a schematic diagram of the cleaning component in this invention;

[0027] Figure 6 This is a side view of the observation window assembly in this invention.

[0028] Figure 7 This is a front view schematic diagram of the observation window component in this invention.

[0029] Explanation of reference numerals in the attached drawings: 001, Pump body crankcase; 002, Flat glass; 003, External pressure frame; 004, Fastening bolt; 005, Sliding hinge support; 006, Rotatable observation window cover assembly; 0061, Observation window cover body; 0062, Circular flat glass; 007, Quick-opening latch assembly; 0071, Lock fixing seat; 0072, Elastic flip latch; 0073, Limiting block; 008, External magnetic control structure; 0081, External mounting plate; 0 082. Sliding guide rail for the base of the enclosure; 0083. Magnetic lock anti-slip seat for the cover plate; 009. Inner sliding actuator structure; 0091. Inner mounting plate; 0092. Built-in sliding guide rail for the cover plate; 0093. Magnetic positioning slide for the glass; 0010. Cleaning components; 00101. U-shaped frame plate; 00102. Raised structure; 00103. Recessed oil collection groove; 0011. Glass sealing buffer strip; 0012. Enclosure sealing base frame; 0013. Enclosure end face sealing frame. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description to provide a thorough understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below. Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0032] Reference Figures 1-7 As shown, this embodiment provides a four-plunger pump, which effectively solves the problems of cumbersome bolt disassembly and assembly, low maintenance efficiency, and inconvenience in cleaning oil stains on the inside of the observation glass in the prior art. The existing four-plunger pumps mostly use an external pressure frame 003 and multiple sets of fastening bolts 004 for the flat glass 002, which is a compression installation method. The installation structure is scattered, the disassembly and assembly process is cumbersome, and long-term vibration can easily cause problems such as loosening of the pressure frame, glass displacement, sealing failure and oil leakage. The overall structure abandons the traditional bolt-pressing sealing structure and bolt-pressing glass installation structure, and adopts a sliding flip opening and closing structure combined with a magnetic cleaning structure, which takes into account both sealing stability and convenient operation and maintenance.

[0033] A four-plunger pump includes a pump body crankcase 001. A maintenance observation port is provided on the side wall of the pump body crankcase 001. An observation window assembly is installed at the maintenance observation port. The observation window assembly includes a sliding hinge support 005 fixedly installed on the cover mounting surface of the crankcase maintenance observation port and a flip-up observation window cover assembly 006. The flip-up observation window cover assembly 006 is hinged to the sliding hinge support 005. A quick-release locking assembly 007 is installed at the end of the flip-up observation window cover assembly 006 opposite to the sliding hinge support 005. The quick-release locking assembly 007 enables the quick locking and unlocking of the flip-up observation window cover assembly 006 onto the cover mounting surface of the pump body crankcase 001, eliminating all the clamping bolts of the traditional observation window structure and achieving tool-free quick opening and closing.

[0034] The flip-up viewing window cover assembly 006 integrates a cooperating outer magnetic attraction control structure 008 and an inner sliding execution structure 009. A cleaning component 0010 is installed on the inner sliding execution structure 009. The outer magnetic attraction control structure 008 drives the inner sliding execution structure 009 to move, thereby moving the cleaning component 0010 to clean the inner wall of the flip-up viewing window cover assembly 006. The entire process does not require drilling holes in the cover to install a transmission structure. It relies on magnetic attraction to achieve internal and external linkage, completing a non-damaging, disassembly-free glass cleaning operation.

[0035] In one specific embodiment, the flip-up observation window cover assembly 006 includes an observation window cover body 0061. A circular through-hole is formed in the center of the observation window cover body 0061, and a circular flat glass 0062 is glued to the circular through-hole. The observation window cover body 0061 is hinged to a sliding hinge support 005, enabling overall sliding and flipping opening and closing, replacing the traditional bolt-fixed structure. The observation window cover body 0061 has a box-like structure. The circular through-hole is centrally located on the surface of the observation window cover body 0061, serving as a transparent window for observing the internal working conditions of the crankcase. The circular flat glass 0062 is correspondingly embedded in the circular through-hole, serving as a visual observation medium, enabling real-time observation of the pump's internal structure and oil conditions while ensuring sealing.

[0036] In one specific embodiment, two sets of the outer magnetic attraction control structure 008 are symmetrically arranged on the left and right sides of the circular flat glass 0062, respectively. The outer magnetic attraction control structure 008 includes two outer mounting plates 0081 mounted on the outer mounting surface of the crankcase cover plate. The two outer mounting plates 0081 support and are mounted on the sliding guide rail 0082 of the case base. A cover plate magnetic attraction lock anti-slip seat 0083 is slidably mounted on the sliding guide rail 0082 of the case base plate. The cover plate magnetic attraction lock anti-slip seat 0083 is mounted on the sliding guide rail 0082 of the case base plate facing the main body 0061 of the observation window cover plate and is arranged with a gap between it and the main body 0061 of the observation window cover plate. The cover plate magnetic locking anti-slip seat 0083 of the outer magnetic control structure 008 forms the outer magnetic mating base, which can form a precise magnetic alignment with the inner sliding execution structure 009, providing a precise magnetic driving force for the sliding movement of the inner sliding execution structure 009, ensuring the linkage and synchronization of the inner and outer structures, and ensuring that the glass cleaning operation is carried out smoothly and accurately.

[0037] In one specific embodiment, two sets of the inner sliding actuator structure 009 are symmetrically arranged. The two sets of inner sliding actuator structures 009 are respectively arranged on the left and right sides of the circular flat glass 0062 and correspond to their positions. The inner sliding actuator structure 009 includes an inner mounting plate 0091 installed on the inner mounting surface of the crankcase cover plate. The inner mounting plates 0091 are supported and mounted with a cover plate built-in sliding guide rail 0092. A glass magnetic positioning slide block 0093 is slidably mounted on the cover plate built-in sliding guide rail 0092. The glass magnetic positioning slide 0093 can slide smoothly laterally along the built-in sliding guide rail 0092 of the cover plate. The inner sliding execution structure 009 and the outer magnetic control structure 008 form a magnetic attraction without air contact. The inner glass magnetic positioning slide 0093 can be driven to slide synchronously by the outer magnetic attraction force, thereby driving the matching cleaning component 0010 to complete the oil stain cleaning operation on the inside of the circular flat glass 0062. The entire process does not require drilling to install the transmission structure or external fasteners. It has strong structural integrity and is convenient for operation and maintenance.

[0038] The glass magnetic positioning slide 0093 is mounted on the built-in sliding guide rail 0092 of the cover plate facing the main body of the observation window cover plate 0061, and is arranged with a gap between it and the main body of the observation window cover plate 0061. In addition, the length of the U-shaped frame plate 00101 is greater than the diameter of the flat glass.

[0039] In one specific embodiment, the cleaning component 0010 is configured as a U-shaped frame plate 00101. The two ends of the U-shaped frame plate 00101 are configured and installed on two glass magnetic positioning slides 0093 arranged on the left and right. The upper part extends and protrudes to form a protruding structure 00102 that contacts the inner side line of the crankcase cover plate. The U-shaped frame plate 00101 is generally spanned over the inner area of ​​the circular flat glass 0062. The inner side plate of the U-shaped frame plate 00101 is arranged to fit against the inner side wall of the circular flat glass 0062. When the outer magnetic control structure 008 drives the magnetic positioning slides 0093 on both sides of the glass to slide horizontally in sync, the U-shaped frame plate 00101 can be driven to make horizontal reciprocating sliding motion along the inner side of the circular flat glass 0062. Relying on the close contact and scraping action between the U-shaped frame plate 00101 and the glass wall, the oil mist, oil stains and impurities attached to the inner surface of the circular flat glass 0062 can be completely scraped away.

[0040] In one specific embodiment, a glass sealing buffer strip 0011 is glued to the end face of the observation window cover body 0061 facing the crankcase cover mounting surface. A housing sealing base frame 0012 is installed on the cover mounting surface of the pump body crankcase 001, and a housing end face sealing frame 0013 is glued to the top of the housing sealing base frame 0012. When the observation window cover body 0061 is closed onto the surface of the pump body crankcase 001, the housing end face sealing frame 0013 and the glass sealing buffer strip 0011 are respectively at different sealing mating surfaces and are simultaneously subjected to pressure deformation, forming two independent sealing defense lines. The glass sealing buffer strip 0011, attached to the observation window cover body 0061, mainly serves to fill the assembly gap between the cover mounting surface of the pump body crankcase 001 and the observation window cover body 0061, acting as an external seal and providing flexible buffering. The sealing frame 0013 on the end face of the box is located on the inner side of the sealing base frame 0012 of the box and the main body of the observation window cover 0061. After the cover is closed and locked, the sealing frame 0013 on the end face of the box is squeezed and deformed. The two sealing structures are independent of each other and cooperate with each other to form a complete double sealing system.

[0041] In one specific embodiment, the U-shaped frame plate 00101 has two concave oil collection grooves 00103 on the side facing the observation window cover plate body 0061. The concave oil collection grooves 00103 are continuous groove structures, which can receive and collect the fallen oil and impurities in real time during the process of scraping off oil stains, and prevent oil stains from flowing and spreading everywhere and adhering to the glass wall or the inner side of the cover plate. One side of the concave oil collection grooves 00103 is connected to the inclined surface of the protruding structure 00102.

[0042] In one specific embodiment, the quick-opening latch assembly 007 includes a latch fixing seat 0071, an elastic flip latch 0072, and a limiting block 0073. The latch fixing seat 0071 is fixedly embedded in the cover plate mounting surface of the pump body crankcase 001. The elastic flip latch 0072 is hingedly assembled on the latch fixing seat 0071. The limiting block 0073 is fixedly installed on the outer end face of the flip-up observation window cover assembly 006 and corresponds to and matches the position of the elastic flip latch 0072.

[0043] During operation, the main body 0061 of the box-shaped observation window cover plate flips and closes to the inspection and observation port of the pump crankcase 001 via the sliding hinge support 005. It is then fastened and fixed without bolts by the quick-release locking assembly 007. Relying on the elastic pre-tightening pressure of the quick-release locking assembly 007, the main body 0061 of the observation window cover plate is stably pressed against the mounting end face of the crankcase. This causes the glass sealing buffer strip 0011 glued to the main body 0061 of the observation window cover plate and the box end face sealing frame 0013 at the top of the box sealing base frame 0012 to undergo synchronous pressure elastic deformation, forming a double sealing defense line that is independent of each other and cooperates internally and externally. This effectively resists the risk of gap loosening caused by long-term high-frequency vibration of the pump body, eliminates oil leakage problems at the observation port, and ensures the sealed operation of the internal cavity of the crankcase.

[0044] Staff can directly observe the oil level inside the crankcase and the operating conditions of the transmission components in real time through the circular flat glass 0062 in the middle of the main body of the observation window cover 0061. When the view is obstructed by oil mist or oil stains due to long-term contact with the oil inside the cavity, there is no need to unlock the quick-opening latch assembly 007 or disassemble any structure. Simply manually move the cover plate magnetic lock anti-slip seat 0083 of the outer magnetic control structure 008 symmetrically arranged on the left and right sides of the circular flat glass 0062. Relying on the precise magnetic alignment between the cover plate magnetic lock anti-slip seat 0083 and the inner glass magnetic positioning slide seat 0093, the inner sliding execution structure 009 is driven non-contactly along the built-in sliding guide rail of the cover plate. 092 makes a smooth lateral reciprocating sliding motion, which in turn drives the U-shaped frame plate 00101, which is fixed at both ends on the glass magnetic positioning slide 0093 and has an overall length greater than the diameter of the circular flat glass 0062, to move synchronously. By utilizing the close contact and scraping between the inner side of the U-shaped frame plate 00101 and the inner wall of the circular flat glass 0062, as well as the line contact between the upper protruding structure 00102 and the inner side of the cover plate, the oil stains and oil mist attached to the inner side of the glass are scraped away from all directions without dead angles. During the cleaning process, the stripped oil can be quickly guided and collected along the inclined surface of the protruding structure 00102 into the double concave oil collection groove 00103 that runs along the side of the U-shaped frame plate 00101 facing the cover plate, effectively preventing the oil stains from flowing around and adhering again.

[0045] In subsequent processes, the collected oil can be filtered and reused according to processing requirements to achieve recycling and reuse, which greatly reduces lubricating oil consumption and improves the economic efficiency of equipment operation.

[0046] When deep inspection, maintenance, replacement, and cleaning of core components such as the crankshaft, connecting rod, and plunger inside the crankcase are required, or when cleaning component 0010 is needed, simply manually move the elastic flip-lock 0072 of the quick-release latch assembly 007 to release it from the limiting constraint of the limiting block 0073 to quickly unlock the cover. Then, the main body 0061 of the box-type observation window cover is flipped open along the sliding hinge support 005, fully exposing the inspection and observation port to provide ample space for maintenance operations. After the maintenance work is completed, the cover is reset and the spring is pressed. The 0072 flip-lock buckle allows for quick locking and reset, eliminating the need for disassembly tools and tightening multiple bolts. This completely eliminates the drawbacks of traditional observation window bolt installation and removal, which are cumbersome and inefficient. The entire device combines a sliding flip-lock boltless opening and closing structure, a double-sealing structure, and an internal and external magnetic linkage structure for easy cleaning and oil return. While ensuring the pump's operational sealing stability and structural integrity, it greatly improves the convenience of daily observation, glass cleaning, and equipment maintenance, making it suitable for the high-load, high-vibration long-term industrial operation conditions of four-plunger pumps.

[0047] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0048] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0049] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A four-plunger pump, comprising a pump body crankcase (001), wherein a maintenance observation port is provided on the side wall of the pump body crankcase (001), and an observation window assembly is fitted at the maintenance observation port, characterized in that: The observation window assembly includes a sliding hinge support (005) fixedly installed on the cover mounting surface of the crankcase inspection and observation port and a flip-up observation window cover assembly (006). The flip-up observation window cover assembly (006) is hingedly mounted on the sliding hinge support (005). A quick-release latch assembly (007) is mounted on one end of the flip-up observation window cover assembly (006) away from the sliding hinge support (005). The quick-release latch assembly (007) enables the flip-up observation window cover assembly (006) to be quickly locked and unlocked on the cover mounting surface of the pump crankcase (001). The flip-up viewing window cover assembly (006) is equipped with an outer magnetic attraction control structure (008) and an inner sliding actuator structure (009) that cooperate with each other. A cleaning component (0010) is installed on the inner sliding actuator structure (009). The inner sliding actuator structure (009) is driven to move by the non-contact magnetic attraction of the outer magnetic attraction control structure (008) to drive the cleaning component (0010) to move and clean the inner wall of the flip-up viewing window cover assembly (006).

2. The four-plunger pump as described in claim 1, characterized in that: The flip-up observation window cover assembly (006) includes an observation window cover body (0061) hinged to a sliding hinge support (005). The observation window cover body (0061) is box-shaped. A circular through-hole is provided in the middle of the observation window cover body (0061), and a circular flat glass (0062) is glued to the circular through-hole.

3. The four-plunger pump as described in claim 2, characterized in that: In one specific embodiment, two sets of the outer magnetic attraction control structure (008) are symmetrically arranged and respectively arranged on the left and right sides of the circular flat glass (0062). The outer magnetic attraction control structure (008) includes two outer mounting plates (0081) mounted on the outer mounting surface of the crankcase cover plate. The two outer mounting plates (0081) support the mounting of the housing base sliding guide rail (0082). A cover plate magnetic attraction lock anti-slip seat (0083) is slidably mounted on the housing base sliding guide rail (0082).

4. The four-plunger pump as described in claim 3, characterized in that: The inner sliding actuator (009) is symmetrically arranged in two sets. The two sets of inner sliding actuator (009) are respectively arranged on the left and right sides of the circular flat glass (0062) and correspond to their positions. The inner sliding actuator (009) includes an inner mounting plate (0091) mounted on the inner mounting surface of the crankcase cover plate. The inner mounting plates (0091) are supported and mounted on the plate surfaces of the two inner mounting plates (0091). A glass magnetic positioning slide (0093) is slidably mounted on the inner sliding guide rail (0092).

5. The four-plunger pump as described in claim 4, characterized in that: The cleaning component (0010) is configured as a U-shaped frame plate (00101), the two ends of which are mounted on two glass magnetic positioning slides (0093) arranged on the left and right. The upper part extends and protrudes to form a protruding structure (00102) that contacts the inner side line of the crankcase cover plate. The U-shaped frame plate (00101) is spread across the inner area of ​​the circular flat glass (0062). The inner side of the U-shaped frame plate (00101) is attached to the inner wall of the circular flat glass (0062).

6. The four-plunger pump as described in claim 5, characterized in that: A glass sealing buffer strip (0011) is glued to the end face of the observation window cover plate body (0061) facing the crankcase cover plate mounting surface. A housing sealing base frame (0012) is installed on the cover plate mounting surface of the pump body crankcase (001). A housing end face sealing frame (0013) is glued to the top of the housing sealing base frame (0012).

7. The four-plunger pump as described in claim 6, characterized in that: The U-shaped frame plate (00101) has two concave oil collection grooves (00103) on the side facing the observation window cover plate body (0061). The concave oil collection grooves (00103) are continuous groove structures, and one side of the concave oil collection grooves (00103) is connected to the inclined surface of the protruding structure (00102).

8. The four-plunger pump as described in claim 7, characterized in that: The cover plate magnetic lock anti-slip seat (0083) is installed on the sliding guide rail (0082) of the box base facing the main body of the observation window cover plate (0061), and is arranged with a gap between it and the main body of the observation window cover plate (0061). The glass magnetic positioning slide (0093) is installed on the built-in sliding guide rail (0092) of the cover plate facing the main body of the observation window cover plate (0061), and is arranged with a gap between it and the main body of the observation window cover plate (0061).

9. The four-plunger pump as described in claim 8, characterized in that: The quick-opening latch assembly (007) includes a latch fixing seat (0071), an elastic flip latch (0072), and a limiting block (0073). The latch fixing seat (0071) is fixedly embedded on the cover plate mounting surface of the pump body crankcase (001). The elastic flip latch (0072) is hinged to the latch fixing seat (0071). The limiting block (0073) is fixedly installed on the outer end face of the flip-up observation window cover assembly (006) and corresponds to and matches the position of the elastic flip latch (0072).

10. The four-plunger pump as described in claim 9, characterized in that: The length of the U-shaped frame plate (00101) is greater than the diameter of the flat glass.

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