阅读说明：本技术 一种泵用液力端及结构改进的多通道单向阀组件 (Hydraulic end for pump and multichannel check valve subassembly of institutional advancement ) 是由 张鹤 张生昌 张华军 皮亚明 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种泵用液力端及结构改进的多通道单向阀组件,属于泵阀技术领域。单向阀组件包括设有多条进液流道的阀座,通过阀芯座而可沿启闭方向移动地安装在阀座上的多个锥形阀芯,及用于迫使阀芯阀面紧压于阀座阀面上的弹性复位件；锥形阀芯包括拼合成锥形结构的第一子阀芯与第二子阀芯,第一子阀芯与第二子阀芯的拼合面间压有密封件；第一子阀芯通过紧固件而固定在阀芯座上,第二子阀芯可沿启闭方向活动地安装在阀芯座上；每个子阀芯的外周上固设有非金属缓冲层；进液流道的出液端口面为与单个锥形阀芯相适配的锥形阀座阀面。基于前述结构改进,能降低阀芯与阀座上阀面加工工艺难度的同时,改善水力流道特性,可广泛应用于泵等技术领域中。(The invention relates to a multi-channel check valve component with an improved hydraulic end and structure for a pump, and belongs to the technical field of pump valves. The check valve component comprises a valve seat provided with a plurality of liquid inlet flow channels, a plurality of conical valve cores which are movably arranged on the valve seat along the opening and closing direction through the valve core seat, and an elastic resetting piece used for forcing the valve surface of the valve core to be pressed on the valve surface of the valve seat; the conical valve core comprises a first sub valve core and a second sub valve core which are spliced into a conical structure, and a sealing element is pressed between splicing surfaces of the first sub valve core and the second sub valve core; the first sub valve core is fixed on the valve core seat through a fastener, and the second sub valve core can be movably arranged on the valve core seat along the opening and closing direction; a non-metal buffer layer is fixedly arranged on the periphery of each sub valve core; the liquid outlet port surface of the liquid inlet flow passage is a conical valve seat surface matched with a single conical valve core. Based on the structural improvement, the hydraulic flow channel characteristic can be improved while the processing process difficulty of the valve surfaces on the valve core and the valve seat can be reduced, and the hydraulic flow channel can be widely applied to the technical fields of pumps and the like.)

1. A multi-channel check valve component with improved structure comprises a valve seat provided with a plurality of liquid inlet flow channels, a plurality of valve cores which are movably arranged on the valve seat along the opening and closing direction through a valve core seat, and an elastic reset piece which is used for forcing the valve surface of the valve core to be pressed on the valve surface of the valve seat;

the method is characterized in that:

the valve core is a conical valve core, the conical valve core comprises a first sub valve core and a second sub valve core which are spliced into a conical structure, and a sealing element is pressed between splicing surfaces of the first sub valve core and the second sub valve core; the first sub valve core is fixed on the valve core seat through a fastener, and the second sub valve core can be movably arranged on the valve core seat along the opening and closing direction; a nonmetal buffer layer is fixedly arranged on the periphery of each sub valve core;

the liquid outlet port surface of the liquid inlet flow channel is a conical valve seat valve surface matched with the single conical valve core.

2. The multi-channel check valve assembly of claim 1, wherein:

in the first sub valve core and the second sub valve core, a clamping strip is convexly formed on the splicing surface of one of the first sub valve core and the second sub valve core, and a clamping groove matched with the clamping strip is concavely formed in the splicing surface of the other of the first sub valve core and the second sub valve core;

the clamping groove and the clamping strip are matched to form a stopping mechanism for stopping the second sub valve core from being separated from the valve core seat along the opening and closing direction towards the direction pointing to the valve surface of the conical valve seat.

3. The multi-channel check valve assembly of claim 2, wherein:

the clamping groove is a single-side groove wall surface groove formed by inwards recessing the end surface of the other valve core seat away from the valve core seat;

a receiving groove for receiving the seal member is provided on the other.

4. The multi-channel check valve assembly of any of claims 1 to 3, wherein:

one of the second sub valve core and the valve core seat is convexly provided with a centering convex part along the opening and closing direction; the centering bulge is used for matching with a centering groove arranged on the other valve core, so that the two sub valve cores are installed on the valve core seat in a centering and matching mode.

5. The multi-channel check valve assembly of any of claims 1 to 4, wherein:

and a flow guide channel for guiding a part of fluid is arranged on the inner side of the valve core seat.

6. The multi-channel check valve assembly of claim 5, wherein:

the guide channel is in butt joint with the liquid inlet flow channel;

the check valve assembly comprises a cylindrical guide fluid director fixedly connected with the valve seat, and the valve core seat is provided with a sleeving hole movably sleeved outside the guide fluid director; a guide hole for constructing the guide channel is formed on the sleeving hole surface of the valve core seat and/or on the peripheral surface of the guide fluid director in an inwards concave manner; the valve cores are uniformly arranged around the circumference of the guide fluid director.

7. The multi-channel check valve assembly of any of claims 1 to 6, wherein:

the first sub valve core and the second sub valve core are both of a half valve core structure.

8. The multi-channel check valve assembly of any of claims 1 to 7, wherein:

and the conical peripheral surface of the sub valve core is provided with an installation groove for nesting the installation root of the non-metal buffer layer.

9. A pump fluid end comprises a medium pumping cavity, a one-way valve assembly arranged at a medium inlet of the medium pumping cavity and a one-way valve assembly arranged at a medium outlet of the medium pumping cavity, wherein an external connecting port used for adjusting the pressure in the cavity of the medium pumping cavity is arranged on the medium pumping cavity so as to form relatively low pressure or relatively high pressure in the cavity and trigger one of the one-way valve assemblies to be opened and conducted;

the method is characterized in that:

the one-way valve assembly is a multi-channel one-way valve assembly as claimed in any one of claims 1 to 8.

10. The fluid end for a pump according to claim 9, wherein:

the medium pumping cavity is provided with a cylinder structure of which two ports respectively form the medium inlet and the medium outlet; the valve rod penetrates through the cylinder structure, and two ends of the valve rod are correspondingly fixedly connected with the valve seats of the two check valve assemblies.

Technical Field

The invention relates to the technical field of one-way valves, in particular to a multi-channel one-way valve assembly with an improved structure and a pump hydraulic end constructed by the same.

Background

In patent document CN105822539A, a combined inlet and outlet check valve for a reciprocating pump is disclosed, which has a structure shown in fig. 1, and includes an inlet check valve and an outlet check valve; each one-way valve comprises a valve rod 1, a valve seat 5, a guide fluid director 2, a valve core 4, an elastic reset piece 3 and a locking nut, wherein the valve seat 5 and the guide fluid director 2 are sleeved outside the valve rod 1; the elastic reset piece 3 is constructed by adopting a compression spring and is used for accelerating the valve surface of the valve core to be pressed on the valve surface of the valve seat so as to reduce the closing lag angle and reduce the backflow amount.

The check valve is based on the fact that a plurality of independent liquid inlet flow channels are arranged on a valve seat 5, a valve core is matched with a valve face arranged on a valve seat 2 to be capable of being opened and closed synchronously, and the valve flow is increased, so that the check valve is used for constructing a large-displacement reciprocating pump, for example, the check valve is used for a diaphragm pump or an oil isolation hydraulic end of which the application number is CN201921229545.4 and which is already applied by the applicant, but the problems that the service life of the check valve is short, the machining precision of the valve core is high, the flow area is small and the like are found in the using process, for the problem that the flow area is small, the valve face of the valve core and the valve face of the valve seat can be arranged into a conical structure, and the machined valve face of the conical.

Disclosure of Invention

The invention mainly aims to provide a multi-channel check valve component with an improved structure, so that the tight fit degree of a valve core and a valve surface of a valve seat is improved and the processing process difficulty of the valve core and the valve surface of the valve seat is reduced while the flow area and the hydraulic flow channel characteristic are improved by utilizing a conical valve surface structure;

it is another object of the present invention to provide a fluid end for a pump constructed with the above-described multi-channel check valve.

In order to achieve the above main object, the present invention provides a multi-channel check valve assembly with an improved structure, comprising a valve seat provided with a plurality of liquid inlet flow channels, a plurality of valve cores movably mounted on the valve seat along an opening and closing direction through the valve core seat, and an elastic reset member for forcing a valve surface of the valve core to press against a valve surface of the valve seat; the valve core is a conical valve core, the conical valve core comprises a first sub valve core and a second sub valve core which are spliced into a conical structure, and a sealing element is pressed between splicing surfaces of the first sub valve core and the second sub valve core; the first sub valve core is fixed on the valve core seat through a fastener, and the second sub valve core can be movably arranged on the valve core seat along the opening and closing direction; a non-metal buffer layer is fixedly arranged on the periphery of each sub valve core; the liquid outlet port surface of the liquid inlet flow passage is a conical valve seat surface matched with a single conical valve core.

The valve core is set into a conical valve core formed by splicing a first sub valve core and a second sub valve core, the first sub valve core is fixedly connected with the valve core seat on the mounting structure, the second sub valve core is movably mounted on the valve core seat in the opening and closing direction and is matched with a sealing piece between the first sub valve core and the second sub valve core, and the second sub valve core can float up and down to adjust the matching degree of the valve surface of the second sub valve core and the valve surface of the valve seat in the process of pressing and matching the valve surface of the valve core and the valve surface of the valve seat, so that the valve core and valve seat structure matched with the conical valve surface can be processed by utilizing a lower processing technology, and the technical effects of large overflowing area brought by matching of the conical valve surface, low flow rate, small hydraulic loss, high efficiency and high efficiency can be well realized. And because the peripheral surface of the sub-valve core is pasted with the non-metal buffer layer, the impact load during closing can be effectively reduced, the noise is reduced, and the reliability of the valve is improved.

In the first sub-valve core and the second sub-valve core, a clamping strip is convexly formed on the splicing surface of one of the first sub-valve core and the second sub-valve core, and a clamping groove matched with the clamping strip is concavely formed on the splicing surface of the other of the first sub-valve core and the second sub-valve core; the clamping groove and the clamping strip are matched to form a stopping mechanism for stopping the second sub valve core from being separated from the valve core seat along the opening and closing direction towards the direction pointing to the conical groove seat surface. The mounting structure of the second sub-valve element is constructed with a simpler structure.

The more specific proposal is that the clamping groove is a single-side groove wall surface groove formed by inwards recessing the end surface deviating from the valve core seat from the other end surface; a receiving groove for receiving the sealing member is provided on the other. The processing of the clamping groove and the clamping strip is convenient, and the position of the sealing element accommodating groove can be arranged at the middle position of the splicing surface as much as possible.

In a further aspect, the accommodating groove for accommodating the sealing element is disposed at a middle area of the surface of the split surface of the sub-valve core after deducting the groove of the wall surface of the single-side groove, and preferably disposed at a middle position of the surface after deducting the groove of the wall surface of the single-side groove.

The preferable scheme is that a centering convex part is convexly formed on one of the second sub valve core and the valve core seat along the opening and closing direction; the centering bulge is used for being matched with a centering groove arranged on the other valve core, so that the two sub valve cores are better centered and matched and then are installed on the valve core seat.

Another preferred scheme is that a flow guide channel for guiding partial fluid is arranged on the inner side of the valve core seat. And the hydraulic loss is reduced.

The more preferable scheme is that the guide channel is butted with the liquid inlet channel; the one-way valve assembly comprises a cylindrical guide fluid director fixedly connected with the valve seat; the valve core seat is provided with a sleeving hole which is movably sleeved outside the guide fluid director; a guide hole for constructing a guide channel is formed on the sleeving hole surface of the valve core seat and/or on the peripheral surface of the guide fluid director in an inwards concave manner; the valve cores are uniformly arranged around the circumference of the guide fluid director.

Another preferred scheme is that the first sub valve core and the second sub valve core are in a half valve core structure. The valve core is convenient to process and install.

Another preferable scheme is that the conical peripheral surface of the sub-valve core is provided with a mounting groove for nesting a mounting root part of the non-metal buffer layer.

In a further preferred embodiment, the second sub-valve core is movably mounted on the valve core valve seat with a gap in the opening and closing direction. Specifically, the small gap is movably arranged on the valve core seat so as to be finely adjusted in a vertically floating manner.

In order to achieve the other purpose, the hydraulic end for the pump provided by the invention comprises a medium pumping cavity, a one-way valve assembly arranged at a medium inlet of the medium pumping cavity and a one-way valve assembly arranged at a medium outlet of the medium pumping cavity, wherein an external connecting port for adjusting the pressure in the cavity of the medium pumping cavity is arranged on the medium pumping cavity, and a relatively low pressure or a relatively high pressure is formed in the cavity to trigger one of the one-way valve assemblies to open and conduct; the one-way valve assembly is the one-way valve assembly described in any of the above claims.

The opening and closing of the medium inlet and the medium outlet of the multi-channel check valve are controlled by adopting the multi-channel check valve, the requirement on large discharge capacity can be effectively ensured, the service life under the working condition of large discharge capacity can be effectively ensured based on the improvement of the structure of the check valve, and the machining process of the conical valve core is reduced.

The specific scheme is that the medium pumping cavity is provided with a cylinder structure of which two ports respectively form a medium inlet and a medium outlet; the valve rod penetrates through the cylinder structure, and two ends of the valve rod are correspondingly fixedly connected with the valve seats of the two check valve assemblies. So that two one-way valves are mounted into the media pumping chamber.

Drawings

FIG. 1 is a block diagram of a fluid end embodiment 1 of the pump of the present invention;

FIG. 2 is a block diagram of a one-way valve assembly of embodiment 1 of the fluid end for the pump of the present invention;

FIG. 3 is an enlarged, left side view of the structure of FIG. 2;

FIG. 4 is a right side enlarged partial view of the structure shown in FIG. 2;

FIG. 5 is an enlarged view of a portion A of FIG. 3;

FIG. 6 is a perspective view of a deflector in embodiment 1 of a fluid end for a pump according to the present invention;

FIG. 7 is an axial cross-sectional view of a director in embodiment 1 of a fluid end for a pump according to the present invention;

FIG. 8 is a block diagram of a septum assembly in accordance with embodiment 1 of the fluid end of the pump of the present invention;

FIG. 9 is a first axial cross-sectional view of an inner retainer sleeve according to embodiment 1 of the fluid end for a pump of the present invention;

FIG. 10 is a second axial cross-sectional view of an inner retainer sleeve according to embodiment 1 of the fluid end for a pump of the present invention, the second axial cross-sectional view being orthogonal to the first axial cross-sectional view of FIG. 9;

FIG. 11 is a view showing the construction of an outer sheath according to embodiment 1 of the fluid end for a pump of the present invention;

FIG. 12 is an enlarged view of a portion C of FIG. 8;

FIG. 13 is an enlarged view of portion D of FIG. 8;

fig. 14 is a structural view of a hydraulic terminal according to embodiment 2 of the present invention.

Detailed Description

The invention is further illustrated by the following examples and figures.

The invention has the main conception that the structure of the valve core is improved, so that the flow area can be better improved by utilizing the conical valve surface, and the characteristics of a hydraulic flow passage are improved; the structure of the valve stem, the elastic restoring member, the valve seat and the pilot flow guide may be designed with reference to existing products, and is not limited to the exemplary structure in the following embodiments. In addition, the fluid end of the pump is exemplified by the fluid end of a diaphragm pump and an oil isolation pump, and other fluid ends of the pump can be constructed by using the multi-channel check valve.

Fluid end for pump example 1

Referring to fig. 1 to 13, the fluid end 1 for a pump of the present invention is a fluid end for a hydraulic diaphragm pump, and includes a pump body 2, a first check valve assembly 12, a second check valve assembly 13, and a diaphragm assembly 6 sleeved in the pump body 2. In order to ensure a large flux of the pump fluid end 1, the first check valve assembly 12 and the second check valve assembly are multi-channel check valve assemblies, and specifically have more than two fluid inlet channels.

As shown in fig. 1, the pump body 2 includes a cylindrical body 21 with an open upper end and a pump cover 22 detachably and watertightly fastened to the open upper end, and is detachably and fixedly connected by a fixing bolt 231, specifically, the pump body is a cylindrical structure; an elastic seal ring is pressed between the pump cover 22 and the inner cavity wall of the cylindrical body 21. An annular second inner shoulder 24 is provided in a projecting manner at the upper end portion of the inner cavity wall of the cylindrical body 21, and an annular first inner shoulder 25 is provided in a projecting manner at the lower end portion.

A mounting stem 93 for mounting two single valve assemblies is fitted inside the pump body 2, and both ends thereof respectively constitute valve stems of the two check valve assemblies, for example, the lower end thereof is a valve stem 310 of the first check valve assembly 12.

Referring to fig. 2 to 6, the check valve 12 includes a valve stem 310, a lock nut 311, a valve seat 32, a valve core assembly 312, a pilot deflector 33, and a compression spring 313.

The valve stem 310 has an expansion end 3100 at one end and a screw portion fitted to the lock nut 311 at the other end. The valve seat 32 has a sleeve hole 320 sleeved outside the valve rod 310, and a sealing member 318 is pressed between the sleeve hole 320 and the valve rod 310, specifically, the sealing member is constructed by an elastic sealing strip, in this embodiment, the sealing member is a frustum structure, a plurality of liquid inlet flow channels 321 are uniformly arranged around the circumference of the sleeve hole 320, and a liquid outlet port surface of each liquid inlet flow channel 321 is a conical groove seat surface 3210, so that the first check valve assembly 12 is a multi-channel check valve assembly, and can provide a large flux.

As shown in fig. 6 and 7, the guiding fluid director 33 is a cylindrical structure with an expanded end 330, an inner cylindrical hole of the cylindrical structure is used for being sleeved outside the valve rod 310, and a fluid director 331 adapted to and abutted against the liquid inlet channel 321 is provided thereon, that is, in this embodiment, eight fluid directors 331 are provided on the guiding fluid director 33 and are uniformly arranged along the circumferential direction thereof.

The valve core assembly 312 includes a valve core seat 34 and a plurality of conical valve cores 35 mounted on the valve core seat 34, in this embodiment, the number of the conical valve cores 35 is eight, each conical valve core 35 is adapted to be fitted with the conical groove seat surface 3210 and can be openably and closably fitted in the conical groove seat surface 3210 along an axial direction, which is a height direction of the conical valve core. The tapered groove seat surface 3210 forms a valve seat surface in the present embodiment, and the tapered outer peripheral surface of the tapered valve element 35 forms a valve element surface adapted to the valve seat surface, and the two surfaces are in tight fit to realize the on-off fit of the valve.

The valve core seat 34 includes a sleeve portion 340 for fitting over the pilot 33 and an annular plate portion 341 for mounting the conical valve core 35.

Each conical valve core 35 comprises a first sub valve core 36 and a second sub valve core 37 which are split into conical structures, a clamping groove 370 is concavely formed in the split surface of the second sub valve core 37, and a sealing piece accommodating groove 371 is concavely formed in the split surface of the second sub valve core 37, in this embodiment, the accommodating groove 371 is located on the upper side of the clamping groove 370, and is located in the middle area of the surface of the second sub valve core 37, where the clamping groove 370 is deducted. Correspondingly, the splicing surface of the first sub-valve core 36 is convexly provided with a clamping strip 360 matched with the clamping groove 370; in this embodiment, the engaging groove 370 is a single-groove wall recess formed by recessing from the lower end surface of the second sub-valve core 37, that is, the engaging groove 370 is a single-groove wall recess formed by recessing from the end surface of the second sub-valve core 37 away from the valve core seat 34. The second sub-valve core 37 is convexly formed with a centering protrusion 375 along the opening and closing direction, and a centering groove adapted to the centering protrusion 375 is formed on the valve core plate seat 341 of the valve core seat 34, so as to center the splicing surfaces of the two sub-valve cores in the installation process. In addition, a guide hole with a long hole arranged along the opening and closing direction can be arranged on the valve core plate seat of the valve core sleeve 4, and a guide rod which can be slidably sleeved in the guide hole is fixedly arranged on the second half valve core 7 for centering. A non-metal material layer 350 whose outer peripheral surface is used for constructing a buffer layer is fixedly arranged on the outer peripheral surface of each sub-valve core, as shown in fig. 5, specifically, a mounting groove 377 for nesting a mounting root of the non-metal buffer layer is arranged on the conical peripheral surface of the sub-valve core. In this embodiment, the buffer layer is constructed of a non-metallic material such as PTFE.

In the installation, it is used for pressing the sealing member 319 between two this spools to inlay in the accommodation groove 37 to seal to the cooperation of both composition surfaces, specifically choose the elastic sealing strip for sealing. The first sub-valve core 36 is fixed on the annular plate seat portion 341 by tightening the screw 315, and the engaging strip 360 is embedded into the engaging groove 370, so as to limit the upper limit movement of the second sub-valve core 37, so that the second sub-valve core 37 can be movably mounted on the valve core seat 34 along the opening and closing direction, that is, the engaging groove 370 and the engaging strip 360 cooperate to form a stopping mechanism for stopping the second valve core 37 from being separated from the valve core seat 34 along the opening and closing direction toward the direction pointing to the tapered groove seat surface 3210.

As shown in fig. 5, there are matching gaps between the two sides of the split surface of the second sub-valve element 37 and the bottom surfaces of the clamping strip 360 and the valve element plate seat 341, so that after the installation is completed, the gap is movably installed and connected in the opening and closing direction.

In the installation process, the compression spring 313 is sleeved outside the valve core seat 34, one end of the compression spring is pressed against the annular plate seat portion 341, and the other end of the compression spring is pressed against the expansion end portion 330, so that the end surface of the guide fluid director 33 is pressed against the liquid outlet end surface of the valve seat 32 while the valve rod 310 and the lock nut 311 are used for fixing the guide fluid director 33 on the valve seat 32, and thus the conical valve core 35 can be kept in the conical groove seat surface 3210 by the elastic restoring force of the compression spring 313, and the valve core valve surface is detachably contacted with the valve seat valve surface portion on the conical groove 321seat surface 0, that is, the compression spring 313 constitutes an elastic reset piece for forcing the valve core valve surface to be tightly pressed on the valve seat.

The second check valve assembly 13 has the same structure as the first check valve assembly 12 except for the connection structure of the valve stem 310 with other components; to facilitate the simultaneous installation of the two check valve assemblies into the pump body 2, the first check valve assembly 12 is fixed to the lower end portion of the mounting stem 93 by the engagement of the expansion end portion 3100 with the lock nut 311, and the second check valve assembly 13 fixed to the upper end portion of the mounting stem 93 is installed in the open end portion of the pump body 2 by the engagement of the upper end portion of the mounting stem 93 with the other mounting structure.

As shown in fig. 8 to 13, the diaphragm assembly 4 includes a diaphragm 5 and a diaphragm fixing assembly 6; the diaphragm 5 is of a cylindrical membrane structure in a non-deformation state, specifically is of a cylindrical membrane structure and comprises an inner diaphragm 50 and an outer diaphragm 51, and the surfaces of the two diaphragms are tightly sleeved into an integral structure; an outer fixed retainer 500 is formed on the outer surface of the upper end of the inner diaphragm 50 in an outward protruding manner, and an inner fixed retainer 501 is formed on the inner surface of the lower end in an inward protruding manner; an outer fixed retainer 510 is formed to protrude outward from the outer surface of the upper end portion of the outer diaphragm 51, and an inner fixed retainer 511 is formed to protrude inward from the inner surface of the lower end portion.

The diaphragm fixing component 6 comprises an inner limiting sleeve 7, an outer limiting sleeve 8, an inner pressing ring 60 and an outer pressing ring 61. In this embodiment, in order to adapt to the cylindrical diaphragm, facilitate installation and improve the compactness of the overall structure, the body structures of the outer limiting sleeve 8 and the inner limiting sleeve 7 are all set to be cylinder structures, specifically cylinder structures, that is, in this embodiment, the outer limiting sleeve 8, the inner limiting sleeve 7 and the inner diaphragm are all cylinder structures.

As shown in fig. 9 and 10, the inner stop collar 7 is an inner sleeve, which has two axially symmetric positions with accommodating through holes 70 and 71, and the two accommodating through holes 70 and 71 are long hole structures with long axes extending along the axial direction of the inner sleeve, as shown in fig. 10, in the transverse projection, i.e., in the projection on the paper plane in the drawing, the width of the two accommodating through holes 70 and 71 in the shape of a kidney-round hole is substantially equal to the inner diameter of the inner sleeve, specifically slightly smaller than the length of the long axis in the axial direction, which is slightly smaller than the height of the inner sleeve. More than two containing through holes are uniformly distributed around the circumference of the pump body; the number of the accommodating through openings is two, so that the controllability of the deformation of the diaphragm can be improved, and the flow rate conveyed by one deformation can be increased as much as possible.

As shown in fig. 11, the outer limiting sleeve 8 is an outer sleeve, and after the outer limiting sleeve is fixedly connected with the inner limiting sleeve 7 and the diaphragm 5 in a sleeved manner, two oval hole-shaped side wall regions 80 arranged opposite to the accommodating through holes are provided with a plurality of oil passing holes 81, wherein the side wall regions 80 are regions surrounded by chain lines in the figure, and specifically, the oil passing holes 81 are uniformly arranged along the surface of the sleeve in the side wall regions 80. In the installation process, the cylindrical diaphragm 5 is sleeved outside the inner sleeve, the outer sleeve is sleeved outside the diaphragm 5, the outer pressing ring 61 is sleeved outside the outer sleeve, the outer fixing retaining rings 500 and 510 on the inner and outer diaphragms are clamped in the clamping grooves formed in the inner annular surface of the outer pressing ring 61, the inner pressing ring 60 is sleeved outside the inner sleeve, the inner fixing retaining rings 501 and 511 on the inner and outer diaphragms are clamped in the clamping grooves formed in the outer annular surface of the inner pressing ring 6, and the diaphragm 5 is tightly pressed between the inner limiting sleeve 7 and the outer limiting sleeve 8, so that the diaphragm assembly 6 forms a cylindrical structure, particularly a cylindrical structure. As shown in fig. 12 and 13, in the axial direction of the pump body 2, i.e., in the axial direction of the inner and outer sleeves, there is a mounting gap between the two outer stationary collars 500, 510 for accommodating the annular projection projecting radially outward from the inner annular surface of the outer retainer ring 61, and there is a mounting gap between the two inner stationary collars 501, 511 for accommodating the projection projecting radially inward from the inner annular surface of the inner retainer ring 60.

In the present embodiment, for the convenience of installation, the valve seats 32 of the first check valve assembly 12 and the second check valve assembly 13 are each formed in a frustum structure.

The inner annular surface of the first inner shoulder 25 is a tapered mounting through-hole for mounting the valve seat 32 of the first check valve assembly 12 with its large diameter port open. An annular mounting plate 96 is supported on the second inner shoulder 24, the annular mounting plate 96 being provided with a tapered mounting through-hole for mounting the valve seat 32 of the second check valve assembly 13.

In the mounting process, the outer pressing ring 61 of the diaphragm assembly 4 is tightly pressed between the annular mounting plate 96 and the upper shoulder surface of the second inner shoulder 25, and elastic sealing rings are uniformly distributed among the outer pressing ring 61, the valve seat 32 and the inner cylindrical surface of the cylindrical body 21. As shown in fig. 1, the upper end surface of the mounting stem 93 abuts against the lower surface of the pump cover 22, and a pressing sleeve 95, the upper end surface of which abuts against the lower surface of the pump cover 22 and the lower end surface of which abuts against the valve seat 32 of the second check valve assembly 13, is sleeved around the upper end portion of the mounting stem 93. As shown in fig. 4, the lower end surface of the diaphragm assembly 4 is pressed against the upper shoulder surface of the second shoulder 25, and an elastic sealing ring is pressed between the lower end surface and the inner cylindrical surface of the cylindrical body 21.

In the present embodiment, the diaphragm assembly 4 is sleeved in the cylindrical body 21, and the two are coaxially arranged, specifically, coaxially arranged with a central axis, so as to divide the inner cavity 20 of the pump body 2 into an oil cavity 201 and a medium pumping cavity 202, which are transmitted with pressure by the diaphragm, by the diaphragm 5 in the diaphragm assembly 4.

As shown in fig. 1, the upper end of the mounting plunger 93 is provided with a mounting limit shoulder 932 protruding from the lower side of the valve seat 32 of the second check valve assembly, so as to prevent the second valve seat 92 from sliding downward during mounting, thereby facilitating mounting.

In the working process, the oil port 200 arranged on the side wall of the cylindrical body 21 is connected with the reciprocating pump unit, so that the reciprocating pump unit pumps hydraulic oil to or removes hydraulic oil from the oil cavity 201, and the transmission pressure action of the diaphragm 5 is utilized, so that a relatively low pressure is formed in the medium pumping cavity 202 to trigger the first check valve component 12 to be opened and suck the medium to be pumped into the medium pumping cavity 202, and a relatively high pressure is formed to trigger the second check valve component 13 to be opened and pump the medium to be pumped out of the medium pumping cavity 202. Wherein, the oil port 200 constitutes an external connection port in this embodiment.

In the invention, the elastic reset piece for forcing the valve surface of the valve core to be pressed on the valve surface of the valve seat can be constructed by two permanent magnet blocks or elastic rubber cylinders which are oppositely arranged in the same pole, besides the compression spring.

In this embodiment, the fixed connection between the guiding fluid director and the valve seat may be realized by using a screw to cooperate with a screw hole provided on one of the guiding fluid director and the valve seat, or by welding.

Fluid end for pump example 2

As a description of embodiment 2 of the pump fluid end of the present invention, only the differences between embodiment 1 of the pump fluid end described above, that is, the structure other than the check valve will be described below as an example.

Referring to fig. 14, the fluid end 97 for the pump of the present invention is an oil isolation pump fluid end, and includes an oil isolation tank 971, an outlet check valve assembly 973, and an inlet check valve assembly 974; the external pump 972 has a pump port communicated with an oil port 9710 of an oil separation tank 971 through a pipeline, the oil port 9710 constitutes an external connection port in the present embodiment, two check valve assemblies are communicated with a delivery medium inlet and outlet of the oil separation tank 971 through a T-shaped pipeline, so that during operation, when the reciprocating pump 972 sucks oil from the oil separation tank 971, the inlet check valve assembly 974 is automatically opened and the outlet check valve assembly 973 is automatically closed, so that the medium to be delivered enters the oil separation tank 971 from the system inlet, and when the reciprocating pump 972 pumps oil out of the oil separation tank 971, the inlet check valve assembly 974 is automatically closed and the outlet check valve assembly 973 is automatically opened, so that the medium to be delivered in the oil separation tank 971 flows out from the system outlet.

In the above embodiment, the guide flow guider can be omitted, and the flow guide groove is arranged on the hole wall of the inner sleeve hole of the valve core seat, so as to achieve the purpose of flow guiding.