Plunger pump and sealing structure of split pump head thereof

Abstract

The utility model discloses a plunger pump and a sealing structure of a split pump head of the plunger pump, and relates to the technical field of plunger pumps, and the sealing structure of the split pump head of the plunger pump comprises a connecting plate, a pump head shell and a first spigot table; a first through hole for a plunger to penetrate through is formed in the middle of the connecting plate, the end, close to the pump head shell, of the connecting plate is concaved inwards in the axial direction of the first through hole to form a first spigot groove, and the first spigot table is embedded in the first spigot groove. A first via hole for the plunger to penetrate through is formed in the middle of the first spigot table; the connecting plate is connected with the pump head shell in a sealed mode through the first spigot table. When leakage occurs, the whole connecting plate does not need to be replaced, the maintenance cost is reduced, and the maintenance workload is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a plunger pump and a sealing structure of a split pump head thereof. Background Art

[0002] The working principle of the plunger pump is to rely on the reciprocating motion of the plunger in the cylinder and the box body to change the volume of the valve body sealing cavity to achieve suction, discharge and other operations to complete a stroke. The existing plunger pump can use an integrated pump head or a split pump head.

[0003] The split pump head is a plurality of split pump heads arranged between the suction pipe and the discharge pipe of the plunger pump, and each pump head adopts an independent pump head body structure, and each independent split pump head is connected together by a connecting plate.

[0004] Compared with the integrated pump head, the split pump head is prone to leakage, especially when the plunger pump is used for high-pressure water injection. Due to the water pressure and the corrosion and erosion of the medium, the seal between the connecting plate and the pump head may fail and leak. When leakage occurs, the entire connecting plate usually needs to be disassembled and replaced, which increases the maintenance cost and workload.

[0005] In view of the above problems in the prior art, those skilled in the art are in urgent need of a sealing structure for a plunger pump and a split pump head thereof. Utility Model Content

[0006] The purpose of the utility model is to provide a sealing structure of a plunger pump and a split pump head thereof, so as to solve the problems existing in the above-mentioned prior art, and when leakage occurs, it is not necessary to replace the entire connecting plate, thereby reducing maintenance costs and workload.

[0007] To achieve the above purpose, the utility model provides the following solutions:

[0008] In the first aspect, the utility model provides a sealing structure of a split pump head of a plunger pump, comprising a connecting plate, a pump head housing and a first stop platform; a first through hole for the plunger to pass through is provided in the middle of the connecting plate, and one end of the connecting plate close to the pump head housing is recessed inward along the axial direction of the first through hole to form a first stop groove, the first stop platform is embedded in the first stop groove, and a first through hole for the plunger to pass through is provided in the middle of the first stop platform; the connecting plate is sealed and connected to the pump head housing through the first stop platform.

[0009] In some embodiments, one end of the first stop platform close to the pump head housing is recessed inward along the axial direction of the first through hole to form a positioning groove, and an end of the pump head housing close to the connecting plate is provided with a first annular boss, and the first boss can be inserted into the positioning groove; a first sealing ring is provided between the first stop platform and the opposite end of the pump head housing, a second sealing ring is provided between the first boss and the positioning groove, and a third sealing ring is provided between the first stop platform and the first stop groove.

[0010] In some embodiments, it also includes a packing box and a second stop platform; one end of the connecting plate close to the packing box is recessed inward along the axial direction of the first through hole to form a second stop groove, the second stop platform is embedded in the second stop groove, and a second through hole for the plunger to pass through is provided in the middle of the second stop platform; the connecting plate is sealed and connected to the packing box through the second stop platform.

[0011] In some embodiments, the second stop groove includes a first groove and a second groove; one end of the connecting plate close to the packing box is recessed inward along the axial direction of the first through hole to form the first groove, and the bottom surface of the first groove is recessed inward along the axial direction of the first through hole to form the second groove; the second stop platform is embedded in the first groove, and an annular second boss is provided at the end of the second stop platform away from the packing box, and the second boss is embedded in the second groove; a fourth sealing ring is provided between the second stop platform and the opposite end of the packing box, and a fifth sealing ring is provided between the second boss and the second groove.

[0012] In some embodiments, it also includes a valve seat, the pump head housing has a working chamber inside, one end of the plunger can pass through the first through hole and be located in the working chamber, and the valve seat is arranged in the working chamber; the edge of the end face of the valve seat on one side close to the plunger forms a first outer cone along the circumferential direction, and the diameter of the first outer cone close to one end of the plunger is smaller than the diameter of the other end away from the plunger; the inner wall of the pump head housing is provided with a first inner cone surface adapted to the first outer cone surface, a sixth sealing ring is provided between the first outer cone surface and the first inner cone surface, and the outer annular surface of the sixth sealing ring is a cone surface; and / or the edge of the end face of the valve seat on the other side away from the plunger forms a stop sealing groove along the circumferential direction, and a seventh sealing ring is provided in the stop sealing groove.

[0013] In some embodiments, it also includes a suction flange and a clamp, the suction flange includes a first tube body and a second tube body; the side wall of the pump head housing is provided with a liquid inlet, one end of the first tube body is inserted into the liquid inlet, and an eighth sealing ring is provided between the first tube body and the side wall of the pump head housing; a sealing ring is provided between the opposite ends of the first tube body and the second tube body, and the opposite ends of the first tube body and the second tube body have radially protruding connecting bosses, and the clamp is sleeved on the two connecting bosses.

[0014] In some embodiments, a discharge flange is further included, which includes a third tube body and a fourth tube body that are integrally connected; a side wall of the pump head housing is provided with a discharge port, an outer wall of the pump head housing is provided with a first sealing plane at a position corresponding to the discharge port, a second sealing plane is provided at one end of the third tube body, and a ninth sealing ring is provided between the first sealing plane and the second sealing plane.

[0015] In some embodiments, the edges of the opposite ends of the two connecting bosses are both circumferentially formed with a second outer conical surface, the inner wall of the clamp has a second inner conical surface that matches the second outer conical surface, and the clamp is sleeved on the second outer conical surfaces of the two connecting bosses through the second inner conical surface.

[0016] In some embodiments, the first stopper and the connecting plate are made of different materials; and / or the second stopper and the connecting plate are made of different materials.

[0017] In a second aspect, the utility model further provides a plunger pump, comprising the above-mentioned sealing structure of the split pump head of the plunger pump.

[0018] Compared with the prior art, the utility model has achieved the following technical effects:

[0019] The sealing structure of the split pump head of the plunger pump of the utility model is that a first stop groove is provided at one end of the connecting plate, and a first stop platform is embedded and installed in the first stop groove, that is, the first stop platform and the first stop groove are detachably connected. The connecting plate of the utility model is sealed and connected to the pump head housing through the first stop platform. After leakage occurs, the first stop platform can be removed for maintenance and replacement without replacing the entire connecting plate, thereby reducing maintenance costs and reducing maintenance workload.

[0020] Furthermore, a second stop groove is provided at the other end of the connecting plate of the utility model, and a second stop platform is embedded and installed in the second stop groove, that is, the second stop platform and the second stop groove are detachably connected, and the connecting plate is sealed and connected to the packing box through the second stop platform; after leakage occurs, the second stop platform can be removed for maintenance and replacement to reduce maintenance costs and reduce maintenance workload.

[0021] Furthermore, the first stop platform and the second stop platform of the utility model can be made of a material different from that of the connecting plate, for example, a corrosion-resistant material to improve the sealing effect.

[0022] Furthermore, the end of the valve seat of the utility model close to the plunger is the liquid inlet end, and the edge of the liquid inlet end face is improved from the existing right-angle structure to an outer cone structure, and the outer cone surface of the liquid inlet end face of the valve seat and the inner cone surface of the inner wall of the pump head housing are sealed by a sealing ring, and the outer ring surface of the sealing ring is a cone surface, so that the utility model can improve the sealing effect between the liquid inlet end face of the valve seat and the inner wall of the pump head housing through the cone surface sealing. And the other end of the valve seat away from the plunger is the liquid discharge end, and the edge of the liquid discharge end face is provided with a stopper sealing groove, and a sealing ring is installed in the stopper sealing groove. By providing the stopper sealing groove, the height of the sealing ring arranged therein can be increased to improve the sealing effect of the liquid discharge end face of the valve seat.

[0023] Furthermore, the suction flange of the utility model is improved to be connected by a clamp cone surface seal; specifically, the opposite end faces of the first tube body and the second tube body of the suction flange are sealed by a sealing steel ring, and the connecting bosses at the opposite ends of the first tube body and the second tube body are fastened by a clamp, the connecting boss has an outer cone surface, the inner wall of the clamp has an inner cone surface, the clamp is sleeved on the two connecting bosses and fastens the first tube body and the second tube body by the cooperation of the inner cone surface and the outer cone surface. Therefore, the utility model adopts a clamp-type cone surface sealing connection, which can make the first tube body and the second tube body tightly connected by the cone surface cooperation, and is sealed by the sealing steel ring, with good sealing effect, and the use of clamp fastening can reduce the number of fasteners such as bolts, which is easy to install.

[0024] Furthermore, the discharge flange of the utility model is improved from the existing slip type to a flat plate structure integrated with the discharge pipe; specifically, the outer wall of the pump head housing is provided with a first sealing plane at a position corresponding to the discharge port, and the first sealing plane is sealed and connected to the second sealing plane of the discharge flange by a sealing ring; the plane sealing method is adopted, which is easy to install and can enhance the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a cross-sectional view of a split pump head of a plunger pump in some embodiments of the utility model;

[0027] Figure 2A cross-sectional view of the sealing connection between the connecting plate and the pump head housing in some embodiments of the utility model;

[0028] Figure 3 It is a cross-sectional view of the sealing connection between the connecting plate and the packing box in some embodiments of the utility model;

[0029] Figure 4 It is a cross-sectional view of the sealing connection between the valve seat and the pump head housing in some embodiments of the utility model;

[0030] Figure 5 A cross-sectional view of the sealed connection between the pump head housing and the suction flange in some embodiments of the utility model;

[0031] Figure 6 This is a cross-sectional view of the sealed connection between the pump head housing and the discharge flange in some embodiments of the present invention.

[0032] In the figure: 1- pump head housing; 2- connecting plate; 3- packing box; 4- first stopper; 5- second stopper; 6- valve seat; 7- pump head end cover; 8- suction flange; 9- discharge flange; 10- clamp; 11- plunger; 12- packing box cap; 13- packing box pressure plate; 14- first sealing ring; 15- second sealing ring; 16- third sealing ring; 17- fourth sealing ring; 18- fifth sealing ring; 19- sixth sealing ring; 20- seventh sealing ring; 21- eighth sealing ring; 22- ninth sealing ring; 23- sealing ring; 24- first fastener; 25- second fastener Firmware; 26-third fastener; 27-fourth fastener; 28-liquid inlet valve; 29-liquid discharge valve; 61-liquid inlet channel; 62-liquid discharge channel; 81-first tube body; 82-second tube body; 91-third tube body; 92-fourth tube body; 100-first boss; 101-working chamber; 102-liquid inlet; 103-liquid discharge port; 104-first inner cone; 105-first sealing plane; 201-first through hole; 202-first stop groove; 203-second stop groove; 301-second through hole; 2031-first groove; 2032-second groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The utility model aims to provide a sealing structure of a plunger pump and a split pump head thereof, so as to solve the problems existing in the prior art. When leakage occurs, there is no need to replace the entire connecting plate, thereby reducing maintenance costs and workload.

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] The utility model provides a sealing structure of a split pump head of a plunger pump, such as Figures 1 to 6 As shown, it includes a pump head housing 1, a connecting plate 2, a packing box 3, a first stop platform 4 and a second stop platform 5. Among them, the middle part of the packing box 3 is provided with a second through hole 301 along the axial direction, the middle part of the connecting plate 2 is provided with a first through hole 201 along the axial direction, and the inside of the pump head housing 1 is provided with a working chamber 101; the packing box 3 is sleeved on the plunger 11 through the second through hole 301, the plunger 11 reciprocates along the axial direction of the second through hole 301, and one end of the plunger 11 can pass through the first through hole 201 and extend into the working chamber 101; that is, the second through hole 301, the first through hole 201 and the working chamber 101 of the utility model are connected, and the reciprocating movement of the plunger 11 can change the volume of the working chamber 101 in the pump head housing 1 to complete the suction or discharge process.

[0037] like Figure 2 and Figure 3 As shown, the end surface of one side of the connecting plate 2 close to the pump head housing 1 is recessed inward along the axial direction of the first through hole 201 to form a first stop groove 202, and the first stop platform 4 is embedded in the first stop groove 202, that is, the first stop platform 4 and the first stop groove 202 are detachably connected, and the middle part of the first stop platform 4 is axially provided with a first through hole for the plunger 11 to pass through; the connecting plate 2 is sealedly connected to the pump head housing 1 through the first stop platform 4. The pump head housing 1 and the connecting plate 2 are connected and fixed by a second fastener 25, and the second fastener 25 can be a bolt or other parts with a fastening function.

[0038] It should be noted that the inward depression in the present invention refers to depression toward the inside of the body.

[0039] One end surface of the first stop platform 4 close to the pump head housing 1 is recessed inward along the axial direction of the first through hole 201 to form a positioning groove, and an annular first boss 100 is provided at one end of the pump head housing 1 close to the connecting plate 2. The first boss 100 is adapted to be plugged into the positioning groove to achieve a positioning connection.

[0040] The utility model is provided with a first sealing ring 14 between the first stop platform 4 and the opposite end faces of the pump head housing 1 to achieve a sealed connection, a second sealing ring 15 is provided between the first boss 100 and the bottom surface of the positioning groove, and a third sealing ring 16 is provided between the first stop platform 4 and the bottom surface of the first stop groove 202; thus, the utility model can achieve sealing between the connecting plate 2, the first stop platform 4 and the pump head housing 1 through the first sealing ring 14, the second sealing ring 15 and the third sealing ring 16.

[0041] It should be noted that technical personnel in this field can specifically set the installation positions of the first sealing ring 14, the second sealing ring 15, and the third sealing ring 16, and the utility model does not make any specific limitations, as long as the corresponding sealing effect can be achieved; and the first stop platform 4 of the utility model can be made of corrosion-resistant materials or other materials to improve the sealing effect and service life, that is, the first stop platform 4 and the connecting plate 2 can be made of different materials.

[0042] In some embodiments, see Figure 2 and Figure 3 As shown, the other end of the connecting plate 2 is sealed and connected to the packing box 3, and one end face of the connecting plate 2 close to the packing box 3 is recessed inward along the axial direction of the first through hole 201 to form a second stop groove 203, and the second stop platform 5 is embedded and installed in the second stop groove 203, that is, the second stop platform 5 and the second stop groove 203 are detachably connected, and a second through hole for the plunger 11 to pass through is axially arranged in the middle part of the second stop platform 5; the connecting plate 2 is sealed and connected to the packing box 3 through the second stop platform 5.

[0043] The second stop groove 203 includes a first groove 2031 and a second groove 2032; wherein, the end surface of one side of the connecting plate 2 close to the packing box 3 is recessed inwardly along the axial direction of the first through hole 201 to form the first groove 2031, and the groove bottom surface of the first groove 2031 is recessed inwardly along the axial direction of the first through hole 201 to form the second groove 2032, so that the first groove 2031 and the second groove 2032 together form a double-layer stop groove structure with steps. The second stop platform 5 is embedded in the first groove 2031, and the end of the second stop platform 5 away from the packing box 3 protrudes axially to form a second boss, which is correspondingly inserted into the second groove 2032.

[0044] The utility model is provided with a fourth sealing ring 17 between the second stop platform 5 and the relative end faces of the packing box 3, and a fifth sealing ring 18 is provided between the second boss and the bottom surface of the second groove 2032; thus, the utility model can achieve sealing between the connecting plate 2, the second stop platform 5 and the packing box 3 through the fourth sealing ring 17 and the fifth sealing ring 18.

[0045] It should be noted that, technical personnel in this field can specifically set the installation positions of the fourth sealing ring 17 and the fifth sealing ring 18, and the utility model does not make specific limitations, as long as the corresponding sealing effect can be achieved; and the second stop platform 5 of the utility model can be made of corrosion-resistant materials or other materials to improve the sealing effect and service life, that is, the second stop platform 5 and the connecting plate 2 can be made of different materials, for example, the connecting plate 2 can be made of carbon steel, and the second stop platform 5 can be made of stainless steel; and technical personnel in this field can also set a sealing waterline on the end face of the second stop platform 5, and realize a sealed connection with the packing box 3 through the sealing waterline and the fourth sealing ring 17.

[0046] like Figure 1 As shown, one end of the packing box 3 away from the connecting plate 2 is connected to the packing box cap 12, and packing filler is filled between the packing box 3 and the plunger 11. The outer wall of the end of the packing box 3 close to the connecting plate 2 is provided with a packing box pressure plate 13, and the packing box pressure plate 13 is connected and fixed to the connecting plate 2 by a first fastener 24, wherein the first fastener 24 can be a bolt or other component with a fastening function.

[0047] In some embodiments, Figure 1 , Figure 4 and Figure 5 As shown, it also includes a valve seat 6, which is located in the working chamber 101 inside the pump head housing 1. The end of the valve seat 6 close to the plunger 11 is the liquid inlet end and the end away from the plunger 11 is the liquid discharge end. The liquid inlet end of the valve seat 6 is connected to the inner wall of the pump head housing 1 through a conical surface seal.

[0048] Specifically, the edge of the liquid inlet end surface of the valve seat 6 forms a first outer cone along the circumferential direction, and the diameter of the first outer cone at one end close to the plunger 11 is smaller than the diameter of the other end away from the plunger 11. The inner wall of the pump head housing 1 is provided with a first inner cone 104 adapted to the first outer cone, and a sixth sealing ring 19 is provided between the first outer cone and the first inner cone 104, and the outer ring side wall, i.e., the outer ring surface of the sixth sealing ring 19 is a cone; thus, the liquid inlet end surface of the valve seat 6 of the utility model and the first inner cone 104 of the pump head housing 1 are connected by a cone surface seal through the sixth sealing ring 19, which can enhance the sealing effect between the liquid inlet end surface of the valve seat 6 and the inner wall of the pump head housing 1.

[0049] In some embodiments, see Figure 4 As shown, the end face edge of the discharge end of the valve seat 6 is recessed to form a stop sealing groove, in which the seventh sealing ring 20 is installed. The utility model can increase the height of the seventh sealing ring 20 according to actual conditions by setting the stop sealing groove to enhance the sealing effect.

[0050] Figure 4In the embodiment, a pump head end cover 7 is installed at one end of the pump head housing 1 away from the connecting plate 2. The pump head end cover 7 is a sieve head. The pump head end cover 7 is connected and fixed to the pump head housing 1 by a third fastener 26. One side of the pump head end cover 7 has a third boss protruding in the axial direction. The third boss is inserted into the working chamber 101 and is sealed and connected to the inner wall of the pump head housing 1. The third fastener 26 can be a bolt or other parts with a fastening function.

[0051] The discharge end surface of the valve seat 6 abuts against one end of the third boss, and a sealing connection is achieved between the discharge end surface of the valve seat 6 and the end surface of the third boss via a seventh sealing ring 20 .

[0052] In some embodiments, Figure 5 and Figure 6 As shown, it also includes a suction flange 8 and a clamp 10. The suction flange 8 includes a first tube body 81 and a second tube body 82, wherein the first tube body 81 is a suction pipe and the second tube body 82 is a suction manifold. The side wall of the pump head housing 1 is provided with a liquid inlet 102 connected to the working chamber 101. One end of the first tube body 81 is plugged into the liquid inlet 102 and is connected to the liquid inlet 102. An eighth sealing ring 21 is provided between the first tube body 81 and the side wall of the pump head housing 1.

[0053] The other end of the first tube body 81 is sealed and connected to the second tube body 82. Specifically, an annular groove with a roughly rectangular cross-section is formed at the opposite ends of the first tube body 81 and the second tube body 82. A sealing ring 23 is installed in the annular groove. The first tube body 81 and the second tube body 82 are sealed and connected by the sealing ring 23, and the first tube body 81 and the second tube body 82 are fastened together by a clamp 10; the sealing ring 23 can be a sealing steel ring or a sealing ring made of other materials.

[0054] Figure 5 In the figure, the opposite ends of the first tube body 81 and the second tube body 82 have connecting bosses protruding radially along the tube body, and the clamp 10 is sleeved on the two connecting bosses to realize the tight connection between the first tube body 81 and the second tube body 82; and the end edge of the connecting boss is formed with a second outer conical surface along the circumferential direction, and the inner wall of the clamp 10 is provided with a second inner conical surface adapted to the second outer conical surface; the second inner conical surface of the clamp 10 is sleeved on the outer conical surfaces of the two connecting bosses, and the first tube body 81 and the second tube body 82 are tightly connected through the matching of the conical surfaces, so as to facilitate installation and enhance the sealing effect.

[0055] In some embodiments, see Figure 5 and Figure 6 As shown, it also includes a discharge flange 9, which includes a third tube body 91 and a fourth tube body 92 that are integrally connected, wherein the third tube body 91 is a discharge pipe, and the fourth tube body 92 is a discharge manifold.

[0056] The side wall of the pump head housing 1 is provided with a discharge port 103 communicating with the working chamber 101, and the outer wall of the pump head housing 1 is provided with a first sealing plane 105 at a position corresponding to the discharge port 103; the third tube body 91 of the discharge flange 9 is provided with a second sealing plane at one end close to the pump head housing 1, and a ninth sealing ring 22 is provided between the first sealing plane 105 and the second sealing plane. The third tube body 91 of the discharge flange 9 is fastened and connected to the pump head housing 1 by a fourth fastener 27 and is sealed by the ninth sealing ring 22. The fourth fastener 27 can be a bolt or other parts with a fastening function.

[0057] It should be noted that those skilled in the art can specifically set the material and cross-sectional shape of each of the above-mentioned sealing rings, and the present utility model does not make any specific limitations thereon.

[0058] In some embodiments, Figure 1 and Figure 4 As shown, it also includes a liquid inlet valve 28 and a liquid discharge valve 29; a liquid inlet channel 61 and a liquid discharge channel 62 are provided in the valve seat 6; one end of the liquid inlet channel 61 is connected to the liquid inlet 102, and the other end is connected to the left chamber of the valve seat 6; one end of the liquid discharge channel 62 is connected to the left chamber of the valve seat 6, and the other end is connected to the right chamber of the valve seat 6.

[0059] The liquid inlet valve 28 is installed in the left chamber of the valve seat 6. The opening and closing ends of the liquid inlet valve 28 abut against the liquid inlet end surface of the valve seat 6 and cover the opening of the liquid inlet channel 61. The liquid inlet valve 28 can close or open the connecting end between the liquid inlet channel 61 and the left chamber under the action of liquid pressure.

[0060] The drain valve 29 is located in the chamber on the right side of the valve seat 6 and is connected to the valve seat 6, and the opening and closing ends of the drain valve 29 abut against the discharge end surface of the valve seat 6 and cover the opening of the drain channel 62, and the drain valve 29 can close or open the connecting end between the drain channel 62 and the right side chamber under the action of liquid pressure; the drain port 103 is connected to the chamber on the right side of the valve seat 6.

[0061] The embodiment of the utility model further provides a plunger pump, comprising the above-mentioned sealing structure of the split pump head of the plunger pump.

[0062] When the sealing structure of the split pump head of the plunger pump of the utility model is in use, the connecting plate 2 is sealed and connected to the pump head housing 1 through the first stop platform 4, and the sealing is specifically performed by setting a first sealing ring 14, a second sealing ring 15 and a third sealing ring 16; when leakage occurs at the connection between the connecting plate 2 and the pump head housing 1, the first stop platform 4 can be removed for replacement and maintenance.

[0063] The connecting plate 2 is sealedly connected to the packing box 3 via the second stop plate 5, which is specifically sealed by setting a fourth sealing ring 17 and a fifth sealing ring 18; when leakage occurs at the connection between the connecting plate 2 and the packing box 3, the second stop plate 5 can be removed for replacement and maintenance.

[0064] In addition, the right-angle fit between the liquid inlet end face of the valve seat 6 and the inner wall of the pump head housing 1 is improved to a conical fit and is sealed by a sixth sealing ring 19. The outer ring surface of the sixth sealing ring 19 is a conical surface to improve the sealing effect; the liquid discharge end face of the valve seat 6 is provided with a stop sealing groove, and a seventh sealing ring 20 is installed in the stop sealing groove for sealing. The size of the seventh sealing ring 20 can be increased according to actual conditions to improve the sealing effect.

[0065] In addition, the suction flange 8 is improved from a flat flange to a clamp-type conical surface sealing connection, the opposite ends of the first tube body 81 and the second tube body 82 are sealed by a sealing ring 23, and the opposite ends of the first tube body 81 and the second tube body 82 are fastened by a clamp 10, and the clamp 10 and the connecting bosses at the opposite ends of the first tube body 81 and the second tube body 82 are fastened by conical surface cooperation, which is convenient for disassembly and assembly and has a good sealing effect.

[0066] The discharge flange 9 is improved from a slip type to a flat plate type integrated with the discharge pipe, and a butt sealing plane is provided between the discharge flange 9 and the outer wall of the pump head housing 1 and is sealed by a ninth sealing ring 22, which is convenient for disassembly and assembly and has a good sealing effect.

[0067] Therefore, the utility model improves the sealing structure of each connection point of the split pump head, including the sealing structure between the connecting plate 2 and the pump head housing 1, the sealing structure between the connecting plate 2 and the packing box 3, the sealing structure of the liquid inlet end and the sealing structure of the liquid discharge end of the valve seat 6, the sealing structure between the first tube body 81 and the second tube body 82 of the suction flange 8, and the sealing structure between the discharge flange 9 and the pump head housing 1, which can effectively solve the leakage problem of each connection point and improve the sealing effect; and when the plunger pump of the utility model is used as a high-pressure water injection pump for high-pressure water injection, it can effectively avoid leakage and ensure the water injection amount.

[0068] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sealing structure for a split pump head of a plunger pump, characterized in that: It includes a connecting plate, a pump head housing and a first stop platform; A first through hole for the plunger to pass through is provided in the middle of the connecting plate, one end of the connecting plate close to the pump head housing is recessed inwardly along the axial direction of the first through hole to form a first stop groove, the first stop platform is embedded in the first stop groove, and a first through hole for the plunger to pass through is provided in the middle of the first stop platform; The connecting plate is sealed and connected to the pump head housing through the first stop platform.

2. The sealing structure of the split pump head of the plunger pump according to claim 1, characterized in that: One end of the first stop platform close to the pump head housing is recessed inwardly along the axial direction of the first through hole to form a positioning groove, and one end of the pump head housing close to the connecting plate is provided with an annular first boss, and the first boss can be inserted into the positioning groove; A first sealing ring is arranged between the first stop platform and the opposite end of the pump head housing, a second sealing ring is arranged between the first boss and the positioning groove, and a third sealing ring is arranged between the first stop platform and the first stop groove.

3. The sealing structure of the split pump head of the plunger pump according to claim 1, characterized in that: Also includes a packing box and a second stop table; One end of the connecting plate close to the packing box is inwardly recessed along the axial direction of the first through hole to form a second stop groove, the second stop platform is embedded in the second stop groove, and the middle of the second stop platform is provided with a second through hole for the plunger to pass through; The connecting plate is sealingly connected to the packing box via the second stop platform.

4. The sealing structure of the split pump head of the plunger pump according to claim 3, characterized in that: The second stop groove includes a first groove and a second groove; One end of the connecting plate close to the packing box is recessed inwardly along the axial direction of the first through hole to form the first groove, and the bottom surface of the first groove is recessed inwardly along the axial direction of the first through hole to form the second groove; The second stopper is embedded in the first groove, and an annular second boss is provided at one end of the second stopper away from the packing box, and the second boss is embedded in the second groove; A fourth sealing ring is arranged between the second stop platform and the opposite end of the packing box, and a fifth sealing ring is arranged between the second boss and the second groove.

5. The sealing structure of the split pump head of the plunger pump according to claim 1, characterized in that: It also includes a valve seat, the pump head housing has a working chamber inside, one end of the plunger can pass through the first through hole and be located in the working chamber, and the valve seat is arranged in the working chamber; The edge of the end face of one side of the valve seat close to the plunger is formed with a first outer conical surface along the circumferential direction, and the diameter of the first outer conical surface close to the plunger is smaller than the diameter of the other end away from the plunger; the inner wall of the pump head housing is provided with a first inner conical surface adapted to the first outer conical surface, a sixth sealing ring is provided between the first outer conical surface and the first inner conical surface, and the outer annular surface of the sixth sealing ring is a conical surface; and / or The edge of the other end surface of the valve seat away from the plunger forms a stop sealing groove along the circumferential direction, and a seventh sealing ring is arranged in the stop sealing groove.

6. The sealing structure of the split pump head of the plunger pump according to claim 1, characterized in that: It also includes a suction flange and a clamp, wherein the suction flange includes a first pipe body and a second pipe body; The side wall of the pump head housing is provided with a liquid inlet, one end of the first tube body is inserted into the liquid inlet, and an eighth sealing ring is provided between the first tube body and the side wall of the pump head housing; A sealing ring is arranged between the opposite ends of the first tube body and the second tube body, and the opposite ends of the first tube body and the second tube body both have connecting bosses protruding in the radial direction, and the clamp is sleeved on the two connecting bosses.

7. The sealing structure of the split pump head of the plunger pump according to claim 1, characterized in that: Also included is a discharge flange, the discharge flange including a third pipe body and a fourth pipe body connected in one piece; The side wall of the pump head housing is provided with a discharge port, the outer wall of the pump head housing is provided with a first sealing plane at a position corresponding to the discharge port, a second sealing plane is provided at one end of the third tube body, and a ninth sealing ring is provided between the first sealing plane and the second sealing plane.

8. The sealing structure of the split pump head of the plunger pump according to claim 6, characterized in that: The edges of the two connecting bosses at one end opposite to each other are both formed with a second outer conical surface along the circumferential direction, the inner wall of the clamp has a second inner conical surface adapted to the second outer conical surface, and the clamp is sleeved on the second outer conical surfaces of the two connecting bosses through the second inner conical surface.

9. The sealing structure of the split pump head of the plunger pump according to claim 3, characterized in that: The first stopper and the connecting plate are made of different materials; and / or The second stop platform and the connecting plate are made of different materials.

10. A plunger pump, characterized in that: A sealing structure comprising a split pump head of a plunger pump according to any one of claims 1 to 9.

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