An emulsion plunger pump

Abstract

The application discloses an emulsion plunger pump, which comprises a pump head assembly, wherein the pump head assembly comprises a pump head body, a liquid suction valve assembly, a liquid discharge valve assembly and a spacer sleeve which separates the liquid suction valve assembly from the liquid discharge valve assembly and is located in the pump head body; the pump head body comprises a liquid suction valve seat mounting portion for mounting the liquid suction valve assembly, a spacer sleeve mounting portion for mounting the spacer sleeve and a liquid discharge valve seat mounting portion for mounting the liquid discharge valve assembly; the liquid discharge valve seat mounting portion and the spacer sleeve mounting portion are connected through a stepped surface, the spacer sleeve mounting portion and the liquid suction valve seat mounting portion are connected through a stepped surface, the aperture of the liquid discharge valve seat mounting portion is larger than the aperture of the spacer sleeve mounting portion, and the aperture of the spacer sleeve mounting portion is larger than the aperture of the liquid suction valve seat mounting portion. The application solves the problem that the existing emulsion plunger pump is difficult to disassemble and assemble due to unreasonable structure.

Description

TECHNICAL FIELD

[0001] The present application relates to an emulsion pump, in particular to an emulsion plunger pump. BACKGROUND

[0002] The emulsion plunger pump station is an important equipment for the fully mechanized coal mining face, and provides hydraulic power for the hydraulic support of the working face, and is the heart of the whole working face hydraulic system. In recent years, with the increasing of large mining height working face in China, in order to meet the high support resistance, high working resistance, and the demand of fast moving and safe support of the large mining height hydraulic support, higher requirements are put forward for the reliability of the emulsion plunger pump station.

[0003] At present, the emulsion plunger pump usually adopts five plunger structure or seven plunger structure of large flow emulsion plunger pump, which has the advantages of high transmission efficiency, stable support, small axial force of gear pair, compact structure, etc., and has been widely applied.

[0004] In the prior art, the liquid suction valve core assembly and the liquid discharge valve assembly in the pump head body of the plunger pump are assembled from the upper and lower sides of the pump head body, so that when the liquid suction valve seat, the liquid suction valve core, the liquid discharge valve seat and the liquid discharge valve core are replaced, the liquid suction pipeline, the liquid suction box and other components need to be removed, which is poor in operability, long in maintenance time and high in maintenance cost; in addition, in the existing emulsion plunger pump, the reset spring mounting seat of the liquid suction valve core is usually designed at the lower part of the liquid discharge valve core, which increases the mass of the liquid discharge valve core and the inertia force, and on the other hand, the high-pressure liquid flow produces impact on the liquid suction valve core and the liquid discharge valve core, and the unilateral stress is large, the guide part is deflected when the valve core rises or falls, and the sealing ring surface is deflected, which affects the service life. SUMMARY

[0005] The technical problem to be solved by the present application is that the unreasonable structure of the existing emulsion plunger pump leads to time-consuming and laborious disassembly and assembly and valve core deflection.

[0006] In view of the above technical problems, the present application provides the following technical solutions:

[0007] An emulsion plunger pump comprises: a crankcase assembly for connecting with a main drive motor to transmit power; a pump head assembly for pumping emulsion; and a hydraulic conversion assembly connected between the crankcase assembly and the pump head assembly, for converting mechanical power of the crankcase into hydraulic change of the pump head assembly; the pump head assembly comprises: a pump head body, and a suction valve assembly, a discharge valve assembly and a spacer sleeve isolating the suction valve assembly from the discharge valve assembly located in the pump head body; wherein the pump head body comprises a suction valve seat mounting portion for mounting the suction valve assembly, a spacer sleeve mounting portion for mounting the spacer sleeve and a discharge valve seat mounting portion for mounting the discharge valve assembly; the discharge valve seat mounting portion has a larger hole diameter than the spacer sleeve mounting portion, and the spacer sleeve mounting portion has a larger hole diameter than the suction valve seat mounting portion.

[0008] In some embodiments of the present application, the suction valve assembly comprises: a suction valve seat provided with a first matching surface; and a suction valve core slidingly connected to the suction valve seat and provided with a second matching surface matching the first matching surface; wherein the first matching surface and the second matching surface are conical surfaces.

[0009] In some embodiments of the present application, the suction valve assembly further comprises a reset spring mounting seat located at the lower side of the suction valve seat, the reset spring mounting seat being sleeved on the valve core; and a first reset spring located between the suction valve seat and the reset spring mounting seat.

[0010] In some embodiments of the present application, the suction valve seat comprises: an outer sleeve body, the outer wall of the outer sleeve body being sealingly connected to the suction valve seat mounting portion, and the end of the inner wall of the outer sleeve body being provided with the first matching surface; and an inner sleeve body connected to the outer sleeve body through a transition arm, the inner wall of the inner sleeve body being slidingly connected to the suction valve core.

[0011] In some embodiments of the present application, the suction valve core comprises: a valve core head provided with the second matching surface; and a valve core rod slidingly connected to the inner sleeve body of the suction valve seat.

[0012] In some embodiments of the present application, the drain valve assembly comprises a drain valve seat provided with a third mating surface; a drain valve core slidingly connected to the drain valve seat, the drain valve core being provided with a fourth mating surface cooperating with the third mating surface; wherein the third mating surface and the fourth mating surface are conical surfaces; a drain valve core stopper between the drain valve seat and a drain cavity cover blocking the upper opening of the pump head body, the outer circumferential surface of the drain valve core stopper being provided with a sealing groove, the drain valve core stopper and the pump head body being radially sealed by a sealing ring arranged in the sealing groove; and a second return spring, one end of which is sleeved on the drain valve core and the other end of which abuts against the drain valve core stopper.

[0013] In some embodiments of the present application, the pump head body is provided with coaxial first and second through holes in the radial direction at the region of the spacer mounting portion, the first through hole being used for communication with the hydraulic conversion assembly; the second through hole is provided with an anti-rotation member for preventing rotation of the spacer and a blocking member for fixing the anti-rotation member.

[0014] In some embodiments of the present application, the hydraulic conversion assembly comprises a packing seat assembly outside the first through hole of the pump head body; and a plunger slidingly connected in the packing seat assembly, one end of the plunger being connected with the crankcase assembly and the other end extending into the first through hole.

[0015] In some embodiments of the present application, the crankcase assembly comprises a crankcase body, at least one gear pair and a crank slider mechanism in the crankcase body; the input gear of the gear pair is used for connection with the output shaft of the main drive motor; the crankshaft of the crank slider mechanism is connected with the output gear of the gear pair, and the slider of the crank slider mechanism extends out of the crankcase body for connection with the plunger; wherein a sealing box assembly is sleeved on the slider to seal the crankcase; the distance between the outer end surface of the sealing box assembly and the outer end surface of the packing seat assembly is greater than the distance between the outer end surface of the packing seat assembly and the end surface of the pump head body.

[0016] In some embodiments of the present application, the sealing box assembly comprises a sealing box mounting plate comprising a connecting plate portion connected with the end surface of the crankcase body and a sealing sleeve portion inserted between the slider and the opening of the crankcase body; wherein the connecting plate portion is connected with the crankcase by bolts embedded in the plate surface of the connecting plate portion; the sealing sleeve is sealingly connected with the crankcase by a sealing ring; an oil seal and an oil seal pressing ring; the oil seal and the oil seal pressing ring are located in the sealing sleeve portion, and the oil seal pressing ring is threadedly connected with the sealing sleeve portion.

[0017] The technical scheme of the present application has the following technical effects relative to the prior art:

[0018] In the emulsion plunger pump disclosed by the present application, the hole diameter of the liquid discharge valve seat mounting portion is larger than the hole diameter of the spacer sleeve mounting portion, and the hole diameter of the spacer sleeve mounting portion is larger than the hole diameter of the liquid suction valve seat mounting portion; in this way, the liquid suction valve core assembly, the spacer sleeve and the liquid discharge valve assembly can be mounted on one side of the pump head body, which is convenient to disassemble and assemble and consumes less time compared with the prior art; at the same time, the liquid suction valve assembly and the liquid discharge valve assembly are isolated by the spacer sleeve, and the liquid suction valve assembly and the liquid discharge valve assembly are independently arranged in structure, which can avoid the impact of liquid flow on the liquid suction valve core and the liquid discharge valve core during the liquid suction and discharge, especially during the high-pressure liquid discharge, and there is no problem of unilateral force, and the guide portion will not be eccentrically worn during the opening and closing of the valve core, and the sealing ring surface will also not be eccentrically worn, and the service life is longer. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the present application will be described in detail below with the help of the accompanying drawings, which will help to understand the purposes and advantages of the present application, in which:

[0020] Figure 1 A perspective view of one specific embodiment of the emulsion plunger pump provided by the present application is shown in the figure;

[0021] Figure 2 A sectional view of one specific embodiment of the emulsion plunger pump provided by the present application is shown in the figure;

[0022] Figure 3 A sectional view of one specific embodiment of the pump head assembly of the emulsion plunger pump provided by the present application is shown in the figure;

[0023] Figure 4 A sectional view of one specific embodiment of the pump head body of the emulsion plunger pump provided by the present application is shown in the figure;

[0024] Figure 5 A structural schematic view of one specific embodiment of the liquid suction valve seat of the emulsion plunger pump provided by the present application is shown in the figure;

[0025] Figure 6 A structural schematic view of one specific embodiment of the liquid suction valve core of the emulsion plunger pump provided by the present application is shown in the figure;

[0026] Figure 7 A structural schematic view of one specific embodiment of the liquid discharge valve seat of the emulsion plunger pump provided by the present application is shown in the figure;

[0027] Figure 8 A structural schematic view of one specific embodiment of the liquid discharge valve core of the emulsion plunger pump provided by the present application is shown in the figure;

[0028] Figure 9The specific embodiment of the valve core stop valve of the emulsion plunger pump is shown in the schematic view of the emulsion plunger pump provided by the application.

[0029] Figure 10 The specific embodiment of the sealing box mounting plate of the emulsion plunger pump is shown in the schematic view of the emulsion plunger pump provided by the application.

[0030] Figure 11 The specific embodiment of the sealing box assembly of the emulsion plunger pump is shown in the schematic view of the emulsion plunger pump provided by the application. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] As Figure 1 , Figure 2The diagram illustrates a specific embodiment of an emulsion plunger pump disclosed in this invention. This embodiment of the emulsion plunger pump is a five-plunger emulsion plunger pump. The emulsion plunger pump comprises three main parts: the first part is a crankcase assembly 300 for connecting to the main drive motor to transmit power; the second part is a pump head assembly 100 for pumping emulsion; and the third part is a hydraulic conversion component 200 for converting the mechanical power of the crankcase into hydraulic changes in the pump head assembly 100. One end of the hydraulic conversion component 200 is connected to the crankcase assembly 300, and the other end is connected to the pump head assembly 100.

[0036] The following sections describe the structure of the three parts and their interconnections.

[0037] <Pump head assembly 100>

[0038] like Figure 3 As shown, the pump head assembly 100 includes a pump head body 101 and a suction box 108 located on the lower side of the pump head body 101; wherein, the suction box 108 is detachably connected to the pump head body 101 by bolts. A suction valve assembly 102, a discharge valve assembly 103, and a spacer 104 is disposed inside the pump head body 101, separating the suction valve assembly 102 and the discharge valve assembly 103. Because the suction valve assembly 102 and the discharge valve assembly 103 are isolated by the spacer 104 in this application, their structures are independently configured. This avoids the impact of liquid flow on the suction valve core and discharge valve core during liquid suction and discharge, especially high-pressure discharge, eliminating the problem of unilateral force. The guide portion will not experience uneven wear during valve core opening or closing, thus preventing uneven wear on the sealing ring surface and extending its service life.

[0039] The pump head body 101 is a cavity structure with openings at the top and bottom. The lower opening 1011 of the pump head body 101 communicates with the suction box 108. The cavity includes: a suction valve seat mounting part 1012 for mounting the suction valve assembly 102, a spacer mounting part 1013 for mounting the spacer 104, and a discharge valve seat mounting part 1014 for mounting the discharge valve assembly 103.

[0040] To facilitate the installation of various components, such as Figure 4As shown, the liquid discharge valve seat mounting portion 1014 and the spacer mounting portion 1013 are connected by a stepped surface, the spacer mounting portion 1013 and the liquid suction valve seat mounting portion 1012 are connected by a stepped surface, the hole diameter B of the liquid discharge valve seat mounting portion 1014 is larger than the hole diameter C of the spacer mounting portion 1013, and the hole diameter C of the spacer mounting portion 1013 is larger than the hole diameter D of the liquid suction valve seat mounting portion 1012. In this way, when the liquid suction valve assembly 102, the liquid discharge valve assembly 103 and the spacer 104 are installed, the liquid suction valve assembly 102 can easily pass through the liquid discharge cavity cover hole 1017, the liquid discharge valve seat mounting portion 1014 and the spacer mounting portion 1013 on the upper side of the pump head body 101 in sequence and enter the liquid suction valve seat mounting portion 1012; the spacer 104 passes through the liquid discharge cavity cover hole 1017 and the liquid discharge valve seat mounting portion 1014 in sequence and enters the spacer mounting portion 1013, and then the liquid discharge valve assembly 103 is installed, so that the liquid suction valve assembly 102, the liquid discharge valve assembly 103 and the spacer 104 can be assembled and disassembled through the opening on the upper side of the cavity.

[0041] Since the liquid suction valve assembly 102, the liquid discharge valve assembly 103 and the spacer 104 are installed on one side, when the parts in the pump head need to be repaired, only the upper end of the pump head body 101 needs to be opened to disassemble the parts. At the same time, since the liquid suction valve assembly 102, the liquid discharge valve assembly 103 and the spacer 104 are installed on one side, the axial matching relationship of each part is easy to ensure, and the problem of mutual interference caused by poor position matching when installed on both sides is avoided.

[0042] The composition and structure of the liquid suction valve assembly 102, the liquid discharge valve assembly 103 and the spacer 104 of the pump head assembly 100 will be introduced below.

[0043] <liquid suction valve assembly 102>

[0044] As shown in Figure 3 The liquid suction valve assembly 102 includes a liquid suction valve seat 1021, a liquid suction valve core 1022, a reset spring mounting seat 1023 located on the lower side of the liquid suction valve seat 1021 and a first reset spring 1024.

[0045] The liquid suction valve core 1022 slides up and down along the liquid suction valve seat 1021 under the action of liquid force, and the first reset spring 1024 is used to provide an elastic force downward to the liquid suction valve core 1022 for blocking the opening of the liquid suction valve seat 1021. The reset spring mounting seat 1023 is installed on the lower side of the liquid suction valve seat 1021. Compared with the spring mounting seat designed for the reset of the liquid suction valve core 1022 at the lower end of the liquid discharge valve core in the prior art, the reset of the liquid suction valve core 1022 is not affected by the action of the liquid discharge valve core, the liquid suction valve core has reliable valve closing, smaller impact and longer service life.

[0046] Specifically, the reset spring mounting seat 1023 is sleeved on the liquid suction valve core 1022, and the two are fixed through threaded connection or interference fit. The reset spring mounting seat 1023 is installed on the liquid suction valve core 1022 to make the liquid suction valve assembly 102 completely independent of the liquid discharge valve assembly 103, facilitating assembly and disassembly.

[0047] Specifically, the liquid suction valve seat 1021 and the pump head body 102 are gap-fitted, and the sealing ring is used to realize sealing connection to facilitate assembly of the liquid suction valve seat 1021. Specifically, the sealing connection mode between the liquid suction valve seat 1021 and the liquid suction valve seat 1021 mounting portion 1012 is not unique. As a preferred mode, a sealing groove is arranged on the outer side surface of the liquid suction valve seat 1021, and an O-shaped sealing ring and two sealing retaining rings are arranged in the sealing groove. The two sealing retaining rings are arranged on the upper and lower sides of the O-shaped sealing ring, respectively. Since the emulsion plunger pump has high liquid pressure, the sealing retaining rings made of polyoxymethylene are arranged on both sides of the O-shaped sealing ring to prevent damage of the O-shaped sealing ring under the action of high-pressure emulsion.

[0048] Specifically, as shown in Figure 5 The liquid suction valve seat 1021 includes an outer sleeve body 1021-1, an inner sleeve body 1021-2, and a transition arm 1021-3 connecting the inner sleeve body 1021-2 and the outer sleeve body 1021-1.

[0049] The outer wall of the outer sleeve body 1021-1 is sealingly connected with the liquid suction valve seat 1021 mounting portion 1012. The end of the inner wall of the outer sleeve body 1021-1 is provided with a first matching surface 1021-4 for matching with the liquid suction valve core 1022. The inner wall of the inner sleeve body 1021-2 is slidingly connected with the liquid suction valve core 1022.

[0050] As shown in Figure 6 The liquid suction valve core 1022 includes a valve core head 1022-1 and a valve core rod 1022-2. The valve core head 1022-1 is used to match with the outer sleeve body 1021-1 of the liquid suction valve seat 1021. The valve core rod 1022-2 is slidingly connected in the inner sleeve body 1021-2 of the liquid suction valve seat 1021.

[0051] The liquid suction valve seat 1021 adopts the structure of inner and outer sleeve bodies, and the liquid suction valve core 1022 adopts the structure of the valve core head 1022-1 and the valve core rod 1022-2, so that the liquid suction valve core 1022 can reliably slide in the inner sleeve body of the liquid suction valve seat 1021, and radial shaking of the liquid suction valve core relative to the liquid suction valve seat in the prior art is avoided.

[0052] The valve core head 1022-1 is provided with a second matching surface 1022-3 matched with the first matching surface 1021-4, wherein the first matching surface 1021-4 and the second matching surface 1022-3 are conical surfaces; the liquid suction valve core 1022 and the liquid suction valve seat 1021 are matched by the conical surfaces to make the sealing between the two better, and meanwhile, the wear can be compensated automatically after the wear, thereby prolonging the service life.

[0053] <the liquid discharge valve assembly 103>

[0054] As shown in Figure 3 , the liquid discharge valve assembly 103 includes a liquid discharge valve seat 1031, a liquid discharge valve core 1032 slidingly connected to the liquid discharge valve seat 1031, a liquid discharge valve core stop valve 1033 located on the upper side of the liquid discharge valve seat 1031, and a second reset spring 1034. The liquid discharge valve core 1032 slides up and down along the liquid discharge valve seat 1031 under the action of liquid force, and the second reset spring 1034 is used to provide an elastic force downward to the liquid discharge valve core 1032 for blocking the opening of the liquid suction valve seat 1021. The liquid discharge valve core stop valve 1033 plays a role in installing the second reset spring 1034 and also plays a role in blocking the liquid discharge cavity, and the liquid discharge valve core stop valve 1033 adopts axial sealing to seal and axially limit at the same time.

[0055] In order to ensure the reliable connection of the liquid discharge valve core stop valve 1033 and the pump head body 101, the upper side of the pump head body 101 is provided with a liquid discharge cavity blocking cover 105 for blocking the upper opening of the cavity. The structure of the liquid discharge blocking cover 105 is not unique, in one embodiment, the liquid discharge cavity blocking cover 105 is pressed against the liquid discharge valve core stop valve 1033 and connected with the pump head body 101 by screws; in another embodiment, as shown in Figure 3 , a thread is arranged on the outer circumferential surface of the liquid discharge cavity blocking cover 105, and the upper opening of the pump head body 101 is arranged as a threaded hole, and the liquid discharge cavity blocking cover 105 is threadedly connected to the pump head body 101.

[0056] Specifically, as shown in Figure 7 , the liquid discharge valve seat 1031 is provided with a third matching surface 1031-1, as shown in Figure 8 , the liquid discharge valve core 1032 is provided with a fourth matching surface 1031-2 matched with the third matching surface 1031-1; wherein the third matching surface 1031-1 and the fourth matching surface 1031-2 are conical surfaces; the liquid discharge valve core 1032 and the liquid discharge valve seat 1031 are matched by the conical surfaces to make the sealing between the two better, and meanwhile, the wear can be compensated automatically after the wear, thereby prolonging the service life.

[0057] Specifically, as shown in Figure 3As shown, the drain valve core stop valve piece 1033 is located between the drain cavity blocking cover 105 that blocks the upper opening of the cavity and the drain valve seat 1031. As shown in the figure, Figure 9 As shown, the drain valve core stop valve piece 1033 includes a spring support portion 1033-1 at the lower side, a blocking portion 1033-2 at the upper side, and a connecting portion 1033-3 therebetween.

[0058] The spring support portion 1033-1 includes a support plate extending horizontally and a support arm extending downward along the support plate, the support arm abutting against the upper end surface of the drain valve seat 1031, and the support plate is formed with a protrusion or a round snap ring for positioning the second return spring 1034.

[0059] The outer peripheral surface of the blocking portion 1033-2 is formed with a sealing groove, and the drain valve core stop valve piece 1033 and the pump head body 101 are radially sealed and connected by a sealing ring arranged in the sealing groove. Compared with the axial limiting and sealing structure of the drain valve core stop valve piece in the prior art, the drain valve core stop valve piece 1033 in the embodiment adopts radial sealing, which can realize the sealing of the pump head body cavity without the axial pressing force of the drain cavity blocking cover 105.

[0060] Specifically, the upper end of the drain valve core 1032 is formed with a cylindrical protrusion, and one end of the second return spring 1034 is sleeved on the cylindrical protrusion.

[0061] <spacer 104>

[0062] As shown, Figure 3 The spacer 104 is formed as a cylindrical sleeve, and two through holes are coaxially arranged on the radial direction of the cylindrical sleeve.

[0063] As shown, Figure 3 , Figure 4 The pump head body 101 is radially formed with a coaxial first through hole 1015 and a second through hole 1016 in the area of the spacer mounting portion 1013, the first through hole 1015 is used for communication with the hydraulic conversion assembly, and the second through hole 1016 is provided with an anti-rotation piece 107 for preventing the rotation of the spacer 104 and a blocking piece 106 for fixing the anti-rotation piece 107.

[0064] <hydraulic conversion assembly 200>

[0065] As shown, Figure 1 The hydraulic conversion assembly 200 includes a packing seat assembly 201 and a plunger 202 slidingly connected in the packing seat assembly 201.

[0066] The packing seat assembly 201 is located outside the first through hole 1015 of the pump head body 101 and is fixedly connected to the crankcase body 301; one end of the plunger 202 is connected to the crankcase assembly 300, and the other end is inserted into the first through hole 1015.

[0067] <Crankcase Assembly 300>

[0068] like Figure 1 As shown, the crankcase assembly 300 includes: a crankcase body 301 and at least one gear pair and a crank-slider mechanism located within the crankcase body 301; the input gear shaft (not shown) of the gear pair is used to connect to the output shaft of the main drive motor; the crankshaft 302 of the crank-slider mechanism is connected to the output gear (not shown) of the gear pair, and the slider 303 of the crank-slider mechanism extends out of the crankcase body 301 and is connected to the plunger 202.

[0069] Among them, such as Figure 2 As shown, a sealing box assembly for sealing the crankshaft housing 301 is fitted on the slider 303; the distance a between the outer end face of the sealing box assembly and the outer end face of the packing seat assembly is greater than the distance b between the outer end face of the packing seat assembly and the end face of the pump head body.

[0070] Thus, after the plunger 202 is removed from the pump head body 101 side, the packing seat assembly can be disassembled from the gap between the crankshaft end face and the pump head body end face without disassembling the pump head body and accessories.

[0071] Specifically, the sealing box assembly includes a sealing box mounting plate 305, an oil seal 306, and an oil seal pressure ring 307; wherein, the sealing box mounting plate 305 includes: a connecting plate portion 305-1 connected to the end face of the crankcase 301, and a sealing sleeve portion 305-2 inserted between the slider 303 and the opening of the crankcase 301; wherein, the connecting plate portion 305-1 is connected to the crankcase 301 by bolts embedded in the surface of the connecting plate portion 305-1; the sealing sleeve 305-2 is sealed to the crankcase 301 by a sealing ring; the oil seal 306 and the oil seal pressure ring 307 are located inside the sealing sleeve portion 305-2, and the oil seal pressure ring 307 is threadedly connected to the sealing sleeve portion 305-2.

[0072] It can be seen that in the above embodiment of the present application, the oil seal pressure ring 307 is embedded in the inside of the sealing box mounting plate 305, and the connecting bolts of the sealing box mounting plate 305 and the crankcase 301 are embedded in the plate surface of the sealing box mounting plate 305, so that the axial size of the entire sealing box mounting plate assembly is small, and compared with the prior art, the structure of the above sealing box assembly increases the distance a between the outer end surface of the sealing box assembly and the outer end surface of the packing seat assembly, so that the packing seat assembly is easy to disassemble and assemble.

[0073] <Working process of emulsion plunger pump>

[0074] During the working process of the emulsion plunger pump, the rotary motion input by the main drive motor drives the input gear shaft and the output gear on the crankshaft 302 to perform one-stage speed reduction, at the same time, the crankshaft 302 drives the connecting rod to rotate, and converts the rotary motion into the reciprocating linear motion of the slider 303 and the plunger 202, so that the volume of the cavity in the pump head assembly 100 changes, when the slider 303 is at the farthest end, the plunger 202 causes the volume of the cavity to increase to form negative pressure, the liquid suction valve core 1022 is opened, and the liquid discharge valve core 1032 is closed, and this process completes the liquid suction; when the slider 303 moves to the nearest end, the plunger 202 causes the volume of the cavity to decrease to compress the sucked liquid to form high-pressure liquid, the liquid suction valve core 1022 is closed, and the liquid discharge valve core 1032 is opened to discharge the high-pressure liquid, and this process completes the liquid discharge, and the above two processes are completed by the five groups of plungers 202 in an interactive manner.

[0075] <Installation and disassembly steps of emulsion plunger pump>

[0076] The assembly of the emulsion plunger pump in the present application can be realized according to the following steps.

[0077] Step 1: Assemble 5 groups of liquid suction valve assemblies 102, before assembly, grind the liquid suction valve seat 1021 and the liquid suction valve core 1022, and perform sealing test.

[0078] Step 2: Put 2 O-ring stop rings and 1 O-ring into the sealing ring groove of the liquid discharge valve seat 1031, the assembly method is to install one O-ring stop ring on each side of the O-ring, assemble 5 groups of the above liquid discharge valve assemblies 103, and after assembly, smear lubricating grease on the surface of the O-ring, and wait for use.

[0079] Step 3: Put the combined sealing ring into the sealing ring groove of the anti-rotation piece 107, the above assembly needs to be assembled for 5 groups, and after assembly, smear lubricating grease on the surface of the assembly sealing ring, and wait for use.

[0080] Step 4: Put the combined sealing ring into the sealing ring groove of the liquid discharge valve core stop valve piece 1033, the above assembly needs to be assembled for 5 groups, and after assembly, smear lubricating grease on the surface of the assembly sealing ring, and wait for use.

[0081] Step 5: Assemble the packing seat assembly 5 and wait for use. After assembly, smear the grease on the inner hole surface of the assembly.

[0082] Step 6: Assemble the sealing box assembly 5 and wait for use. After assembly, smear the grease on the inner hole surface of the assembly.

[0083] Step 7: Put the liquid suction valve assembly 102 completed in step 1 into the liquid suction valve assembly 102 of the pump head body through the pump head body liquid discharge cavity plug hole 1017, and gently knock it with a copper rod to make it tightly fit with the pump head body 101.

[0084] Step 8: Put the spacer sleeve 104 through the pump head body liquid discharge cavity plug hole 1017 on the liquid suction valve assembly 102 installed in step 7, install the anti-rotation piece 107 and the plugging piece 106 at the second through hole 1016, insert the anti-rotation piece 107 into the small hole of the spacer sleeve 104 to position the spacer sleeve 104 in the circumferential direction, and then press the plugging piece 106.

[0085] Step 9: Assemble the liquid discharge valve seat 1031 completed in step 2 to the upper end of the assembly completed in step 8, and gently knock it with a copper rod to make it fit with the spacer sleeve 104.

[0086] Step 10: Assemble the liquid discharge valve core 1032 and the second return spring 1034 from the pump head body liquid discharge cavity plug hole 1017 to the assembly completed in step 9.

[0087] Step 11: Assemble the liquid discharge valve core stop valve piece 1033 completed in step 4 to the assembly completed in step 10, and gently knock the liquid discharge valve core stop valve piece 1033 with a copper rod to make it fit with the liquid discharge valve seat 1031, and then press it with the liquid discharge cavity plugging cover 105.

[0088] Step 12: Install the liquid suction box 108 to the pump head body 101 completed in step 11 by screwing, to form the pump head assembly 100.

[0089] Step 13: Assemble the sealing box assembly to the crankcase assembly 300 of the power end.

[0090] Step 14: Install the packing seat assembly 201 to the crankcase assembly 300 of the power end, and preliminarily connect it with screws, without tightening.

[0091] Step 15: Insert the plunger 202 into the packing seat assembly 201 preliminarily assembled in step 14, and tighten the connecting bolts of the ceramic plunger 202.

[0092] Step 16: Assemble the pump head assembly 100 completed in step 12 to the power end assembly completed in step 15, and tighten the connecting screws.

[0093] Step 17: tighten the screw which is not tightened in step 14. At this point, the installation is completed.

[0094] When the suction and discharge valve assembly needs to be disassembled, the following steps are adopted:

[0095] Step 1: remove the discharge cavity plugging cover 105;

[0096] Step 2: sequentially remove the discharge valve assembly 103 from the discharge cavity plugging cover hole 1017 side;

[0097] Step 3: sequentially remove the plugging member 106 and the anti-rotation member 107;

[0098] Step 4: remove the plunger 202 from the slider 303 side along the first through hole 1015 and the second through hole 1016;

[0099] Step 5: further remove the spacer sleeve 104 and the suction valve assembly 102 from the discharge cavity plugging cover hole 1017 side;

[0100] At this point, the disassembly of each valve assembly in the inner side of the pump head body is completed. In the present scheme, the pump head body can be disassembled without disassembling the suction box 108, which is convenient for maintenance.

[0101] When the packing seat assembly 201 needs to be disassembled, the following steps are adopted:

[0102] Step 1: sequentially remove the plugging member 106 and the anti-rotation member 107;

[0103] Step 2: remove the plunger 202 from the slider 303 side along the first through hole 1015 and the second through hole 1016;

[0104] Step 3: drive the crankcase to make the end face of the slider 303 shrink to the end face of the sealing box assembly, and the packing seat assembly can be removed along the gap between the outer end face of the sealing box assembly and the outer end face of the packing seat assembly.

[0105] It can be seen that the above-mentioned packing seat assembly can be completed without disassembling the suction and discharge valve in the pump head body 101, and the above-mentioned structure greatly reduces the maintenance difficulty of the emulsion piston pump.

[0106] Obviously, the above-mentioned embodiments are only examples for clearly illustrating, and not limit the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above-mentioned description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An emulsion plunger pump comprising: a crankcase assembly for connecting with a main drive motor to transmit power; a pump head assembly for pumping emulsion; and a hydrodynamic conversion assembly connected between the crankcase assembly and the pump head assembly for converting mechanical power of the crankcase into hydrodynamic change of the pump head assembly; characterized in that the pump head assembly comprises: a pump head body and a suction valve assembly, a discharge valve assembly and a spacer sleeve located in the pump head body and separating the suction valve assembly from the discharge valve assembly; wherein the pump head body comprises a suction valve seat mounting portion for mounting the suction valve assembly, a spacer sleeve mounting portion for mounting the spacer sleeve and a discharge valve seat mounting portion for mounting the discharge valve assembly; a stepped surface is provided between the discharge valve seat mounting portion and the spacer sleeve mounting portion and between the spacer sleeve mounting portion and the suction valve seat mounting portion, the discharge valve seat mounting portion has a larger hole diameter than the spacer sleeve mounting portion, and the spacer sleeve mounting portion has a larger hole diameter than the suction valve seat mounting portion; the discharge valve assembly comprises: a discharge valve seat; a discharge valve core slidingly connected to the discharge valve seat; a discharge valve core stopper located between a discharge cavity sealing cover sealing an upper opening of a cavity of the pump head body and the discharge valve seat, the discharge cavity sealing cover being threadedly connected to the pump head body, a sealing groove being formed on an outer circumferential surface of the discharge valve core stopper, and the discharge valve core stopper being radially sealingly connected to the pump head body by a sealing ring provided in the sealing groove; and a second return spring having one end sleeved on the discharge valve core and the other end abutting against the discharge valve core stopper; the suction valve assembly comprises: a suction valve seat provided with a first mating surface; a suction valve core slidingly connected to the suction valve seat, the suction valve core being provided with a second mating surface matching the first mating surface; wherein the first mating surface and the second mating surface are formed as conical surfaces.

2. The emulsion plunger pump according to claim 1, characterized in that: the suction valve assembly further comprises a return spring mounting seat located at a lower side of the suction valve seat, the return spring mounting seat being sleeved on the valve core; and a first return spring located between the suction valve seat and the return spring mounting seat.

3. The emulsion plunger pump according to claim 1, characterized in that: the suction valve seat comprises: an outer sleeve body, an outer wall of the outer sleeve body being sealingly connected to the suction valve seat mounting portion, and an inner wall of the outer sleeve body being provided at an end portion with the first mating surface; an inner sleeve body, the inner sleeve body being connected to the outer sleeve body through a transition arm, and an inner wall of the inner sleeve body being slidingly connected to the suction valve core.

4. The emulsion plunger pump according to claim 3, characterized in that: the suction valve core comprises: a valve core head provided with the second mating surface; a valve core rod slidingly connected in the inner sleeve body of the suction valve seat.

5. The emulsion plunger pump according to claim 1, characterized in that: ​ The drain valve seat is provided with a third matching surface, and the drain valve core is provided with a fourth matching surface matched with the third matching surface; wherein the third matching surface and the fourth matching surface are conical surfaces.

6. The emulsion plunger pump of claim 1, wherein: The pump head body is radially formed with coaxial first and second through holes in the region of the spacer sleeve mounting portion, the first through hole is used for communication with the hydraulic conversion assembly; the second through hole is provided with an anti-rotation member for preventing rotation of the spacer sleeve and a plugging member for fixing the anti-rotation member.

7. The emulsion plunger pump of claim 6, wherein: The hydraulic conversion assembly comprises: A packing seat assembly located outside the first through hole of the pump head body; And a plunger slidingly connected in the packing seat assembly, one end of the plunger is connected with the crankcase assembly, and the other end extends into the first through hole.

8. The emulsion plunger pump of claim 7, wherein: The crankcase assembly comprises: A crankcase and at least one gear pair and a crank slider mechanism located in the crankcase; The input gear of the gear pair is used for connection with the output shaft of the main drive motor; the crankshaft of the crank slider mechanism is connected to the output gear of the gear pair, and the slider of the crank slider mechanism extends out of the crankcase for connection with the plunger; Wherein, the slider is sleeved with a sealing box assembly sealing the crankcase; the distance between the outer end face of the sealing box assembly and the outer end face of the packing seat assembly is greater than the distance between the outer end face of the packing seat assembly and the end face of the pump head body.

9. The emulsion plunger pump of claim 8, wherein: The sealing box assembly comprises: A sealing box mounting plate, the sealing box mounting plate comprises a connecting plate portion connected with the end face of the crankcase and a sealing sleeve portion inserted between the slider and the opening of the crankcase; wherein the connecting plate portion is connected with the crankcase through bolts embedded in the plate face of the connecting plate portion; the sealing sleeve portion is sealingly connected with the crankcase through a sealing ring; An oil seal and an oil seal pressing ring; the oil seal and the oil seal pressing ring are located in the sealing sleeve portion, and the oil seal pressing ring is threadedly connected with the sealing sleeve portion.

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