One-way valve and plunger pump hydraulic structure

Abstract

The invention provides a one-way valve and a plunger pump hydraulic structure, the one-way valve comprises a first valve seat, a second valve seat, an elastic piece and a valve core, the first valve seat is detachably connected with the second valve seat, the first valve seat is provided with a first liquid inlet hole, the second valve seat is provided with a first valve cavity and a first liquid outlet hole, the first liquid inlet hole is communicated with the first liquid outlet hole through the first valve cavity, and the first valve cavity is communicated with the first liquid outlet hole through the second valve cavity; the valve element is movably arranged in the first valve cavity, the elastic piece is connected between the valve element and the second valve seat so as to drive the valve element to move to block the first liquid inlet hole, a first force application part is arranged on the inner wall of the first liquid inlet hole, and a second force application part is arranged on the inner wall of the first liquid outlet hole. The one-way valve is simple in structure, has good universality and can be combined with other hydraulic structures to form hydraulic equipment with various functions; force can be applied to the first valve seat through the first force application part, force can be applied to the second valve seat through the second force application part, and the convenience of disassembly and assembly operation of the one-way valve and the efficiency of maintenance work are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic equipment, in particular to a one-way valve and a plunger pump liquid force structure. BACKGROUND

[0002] Two one-way valves (one is a liquid suction valve and the other is a liquid discharge valve) are usually installed in the valve body of the plunger pump liquid force structure, and the plunger reciprocates in the plunger hole to realize the liquid suction and discharge through the two one-way valves. However, the inner cavity of the valve body in the prior art is deep, and the structures of the components in the inner cavity are different, which is not convenient for force application, so that the one-way valve and other components installed in the inner cavity are not easy to disassemble; in addition, the valve core of the one-way valve is guided by the valve seat or other structures, which may be jammed. SUMMARY

[0003] The main purpose of the present application is to provide a one-way valve and a plunger pump liquid force structure to solve at least one of the technical problems in the related art, such as the inconvenience of disassembling the one-way valve and other components, and the jamming of the valve core of the one-way valve.

[0004] In order to achieve the above-mentioned purpose, according to the present application, a one-way valve is provided, which comprises a first valve seat, a second valve seat, an elastic member and a valve core, the first valve seat is detachably connected with the second valve seat, the first valve seat is provided with a first liquid inlet hole, the second valve seat is provided with a first valve cavity and a first liquid outlet hole, the first liquid inlet hole is communicated with the first liquid outlet hole through the first valve cavity, the valve core is movably arranged in the first valve cavity, the elastic member is connected between the valve core and the second valve seat to drive the valve core to move to block the first liquid inlet hole, a first force applying part is arranged on the inner wall of the first liquid inlet hole, and a second force applying part is arranged on the inner wall of the first liquid outlet hole.

[0005] Further, a first protrusion is arranged on the first valve seat, the first protrusion is located at the edge of the first liquid inlet hole, and the first protrusion is insertedly matched with the first valve cavity.

[0006] Further, a plurality of second protrusions are annularly and spacedly arranged on the second valve seat to abut and limit the first valve seat, a shunt passage is surrounded between adjacent second protrusions, a shunt hole is arranged on the second valve seat corresponding to the shunt passage, the inner wall of the second protrusion surrounds the first valve cavity, and the first valve cavity is communicated with the first liquid outlet hole through the shunt passage and the shunt hole.

[0007] Further, a second valve cavity is arranged in the second valve seat, the shunt hole is communicated with the first liquid outlet hole through the second valve cavity, and the second valve cavity sleeves the elastic member.

[0008] Further, the first force applying part and / or the second force applying part is an internal thread structure for threadedly connecting with a disassembling tool.

[0009] Further, the first liquid inlet hole comprises a cylindrical section and a gradually expanding section in communication with each other, the gradually expanding section being in communication with the first valve cavity; and the outer surface of the valve core is provided with a spherical surface for slidingly connecting with the inner wall of the first valve cavity.

[0010] Further, the outer surface of the first valve seat is provided with a first sealing member.

[0011] The application further provides a plunger pump liquid force structure, comprising a valve body, a liquid suction valve and a liquid discharge valve, the valve body being provided with a second liquid inlet hole, a second liquid outlet hole, a plunger hole and a mounting cavity for connecting the second liquid inlet hole, the second liquid outlet hole and the plunger hole, the liquid suction valve being mounted in the mounting cavity between the second liquid inlet hole and the plunger hole, the liquid discharge valve being mounted in the mounting cavity between the plunger hole and the second liquid outlet hole, at least one of the liquid suction valve and the liquid discharge valve being the one-way valve.

[0012] Further, a distance sleeve is mounted in the mounting cavity, the distance sleeve being provided with a first liquid passing hole and a plunger accommodating hole in communication with each other, the first liquid passing hole connecting the liquid suction valve with the liquid discharge valve, the plunger accommodating hole being in communication with the plunger hole, the diameter of the plunger accommodating hole being greater than or equal to the diameter of the plunger; and a pressing block is mounted in the mounting cavity to abut and limit the liquid discharge valve, the pressing block being provided with a second liquid passing hole for connecting the liquid discharge valve with the second liquid outlet hole.

[0013] Further, the mounting cavity comprises a first hole, a second hole and a third hole opened in the valve body from the outer surface of the valve body, the second liquid inlet hole, the first hole, the second hole, the third hole and the second liquid outlet hole being in communication in sequence, the liquid suction valve and the distance sleeve being mounted in the first hole, the liquid discharge valve being mounted in the second hole, the pressing block being mounted in the third hole, the diameter of the third hole being greater than the diameter of the second hole, and the diameter of the second hole being greater than the diameter of the first hole.

[0014] The one-way valve in the application, through the detachable connection of the first valve seat and the second valve seat, the movable valve core is arranged in the first valve cavity of the second valve seat, and the elastic element is arranged between the valve core and the second valve seat, so that the valve core blocks the first liquid inlet hole on the first valve seat, the one-way check function of the one-way valve is realized, the structure is relatively simple, has good universality, and can be combined with other hydraulic structures to form various functional hydraulic equipment; the first liquid inlet hole inner wall is provided with a first force applying part, and the first liquid outlet hole inner wall is provided with a second force applying part, when the one-way valve needs to be detached from the inside of other valves or needs to be disassembled, the first force applying part can be used to apply force to the first valve seat, and the second force applying part can be used to apply force to the second valve seat, so that the convenience of disassembly operation of the one-way valve and the efficiency of maintenance work are improved.

[0015] The plunger pump liquid force structure in the application, at least one of the liquid suction valve and the liquid discharge valve adopts the one-way valve, through the detachable connection of the first valve seat and the second valve seat, the movable valve core is arranged in the first valve cavity of the second valve seat, and the elastic element is arranged between the valve core and the second valve seat, so that the valve core blocks the first liquid inlet hole on the first valve seat, the one-way check function of the one-way valve is realized, the structure is relatively simple; the first liquid inlet hole inner wall is provided with a first force applying part, and the first liquid outlet hole inner wall is provided with a second force applying part, when the one-way valve needs to be detached from the inside of other valves or needs to be disassembled, the first force applying part can be used to apply force to the first valve seat, and the second force applying part can be used to apply force to the second valve seat, so that the convenience of disassembly operation of the one-way valve is improved, and the maintenance work efficiency of the plunger pump is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the application, and together with the description of the application provided below, explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0017] Figure 1 The schematic diagram of the one-way valve provided for the embodiment of the application is shown in the figure;

[0018] Figure 2 The schematic diagram of the first valve seat provided for the embodiment of the application is shown in the figure;

[0019] Figure 3 The schematic diagram of the second valve seat provided for the embodiment of the application is shown in the figure;

[0020] Figure 4 The cross-sectional schematic diagram of the one-way valve provided for the embodiment of the application (the elastic element is not shown) is shown in the figure;

[0021] Figure 5 The schematic diagram of the valve core provided for the embodiment of the application is shown in the figure;

[0022] Figure 6A schematic diagram of a plunger pump liquid force structure provided by an embodiment of the present application;

[0023] Figure 7 A schematic diagram of a valve body provided by an embodiment of the present application;

[0024] Figure 8 A schematic diagram of a distance sleeve provided by an embodiment of the present application.

[0025] The above drawings include the following reference signs:

[0026] 1, first valve seat; 11, first liquid inlet hole; 111, cylindrical section; 112, gradually expanding section; 113, first force applying part; 12, first protrusion; 13, first sealing member; 2, second valve seat; 21, first valve cavity; 22, first liquid outlet hole; 221, second force applying part; 23, second protrusion; 231, shunt passage; 24, shunt hole; 25, second valve cavity; 3, elastic member; 4, valve core; 41, spherical surface; 42, third protrusion; 01, valve body; 011, second liquid inlet hole; 012, second liquid outlet hole; 013, plunger hole; 014, mounting cavity; 0141, first hole; 0142, second hole; 0143, third hole; 015, limiting plug mounting hole; 02, liquid suction valve; 03, liquid discharge valve; 04, distance sleeve; 041, first liquid passing hole; 042, plunger accommodation hole; 043, limiting plug; 044, limiting clamping groove; 05, pressing block; 051, second liquid passing hole; 06, cover plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0028] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0029] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only and not limitation of the scope of the application. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail but are intended to be understood as a part of the specification when appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is needed.

[0030] In combination Figures 1 to 5 As shown in FIG. 1, a one-way valve provided by the present application is shown in combination Figures 6 to 8 As shown in FIG. 2, a plunger pump hydraulic structure provided by the present application is shown in combination

[0031] The present application provides a one-way valve, comprising a first valve seat 1, a second valve seat 2, an elastic member 3 and a valve core 4, the first valve seat 1 is detachably connected with the second valve seat 2, the first valve seat 1 is provided with a first liquid inlet hole 11, the second valve seat 2 is provided with a first valve cavity 21 and a first liquid outlet hole 22, the first liquid inlet hole 11 is communicated with the first liquid outlet hole 22 through the first valve cavity 21, the valve core 4 is movably arranged in the first valve cavity 21, the elastic member 3 is connected between the valve core 4 and the second valve seat 2 to drive the valve core 4 to move to block the first liquid inlet hole 11, a first force applying part 113 is arranged on the inner wall of the first liquid inlet hole 11, and a second force applying part 221 is arranged on the inner wall of the first liquid outlet hole 22.

[0032] The detachable connection between the first valve seat 1 and the second valve seat 2 can be achieved by any way such as insertion, splicing, abutting and the like, in combination Figure 1As shown, the first valve seat 1 is provided with a first inlet hole 11, and the second valve seat 2 is provided with a first valve cavity 21 and a first outlet hole 22. The first inlet hole 11, the first valve cavity 21 and the first outlet hole 22 are connected in sequence. The valve core 4 can be designed with a specific shape as needed, such as spherical or disc-shaped. It can move in the first valve cavity 21 (for example, it can move in the X-axis and Y-axis directions in the figure). The elastic element 3 (which can be a spring or other elastic component) is connected between the valve core 4 and the second valve seat 2, so that the valve core 4 is driven to move to block the first inlet hole 11 by its own elastic force. The liquid at the first inlet hole 11 overcomes the elastic force of the elastic element 3 and pushes the valve core 4 open, so that the first inlet hole 11 is connected with the first valve cavity 21 and the first outlet hole 22, realizing the one-way check function of the one-way valve. A first force-applying part 113 is provided on the inner wall of the first liquid inlet 11, and a second force-applying part 221 is provided on the inner wall of the first liquid outlet 22. The first force-applying part 113 and the second force-applying part 221 can be a protruding structure or a groove structure, etc. Regardless of the structure, the first force-applying part 113 and the second force-applying part 221 should have a portion of their surface that can withstand the application of external force, thereby enabling the disassembly of the first valve seat 1 and the second valve seat 2, especially when the check valve is installed inside other valves (e.g., Figure 6 The plunger pump hydraulic structure shown in the figure is equipped with the check valve. Other parts on the first valve seat 1 and the second valve seat 2 are not convenient to apply force to. However, by applying force through the first force application part 113 and the second force application part 221, the first valve seat 1 and the second valve seat 2 can be disassembled relatively easily and conveniently, and the check valve can be removed from the other valves.

[0033] The one-way valve of this invention is detachably connected to a first valve seat 1 and a second valve seat 2. The valve core 4 is movably disposed in the first valve chamber 21 of the second valve seat 2. An elastic element 3 is disposed between the valve core 4 and the second valve seat 2, thereby blocking the first inlet hole 11 on the first valve seat 1 and realizing the one-way non-reverse function of the one-way valve. The structure is relatively simple and has good versatility. It can be combined with other hydraulic structures to form hydraulic equipment with various functions. The inner wall of the first inlet hole 11 is provided with a first force-applying part 113, and the inner wall of the first outlet hole 22 is provided with a second force-applying part 221. When it is necessary to remove the one-way valve from the inside of other valves, or when it is necessary to disassemble the one-way valve, force can be applied to the first valve seat 1 through the first force-applying part 113, and force can be applied to the second valve seat 2 through the second force-applying part 221, which improves the convenience of the one-way valve disassembly and assembly operation and the efficiency of maintenance work.

[0034] Furthermore, the first valve seat 1 is provided with a first protrusion 12, which is located at the edge of the first liquid inlet hole 11, and the first protrusion 12 is inserted into the first valve cavity 21.

[0035] Combination Figure 2As shown, the first valve seat 1 is provided with an annular first protrusion 12, which surrounds the edge of the first liquid inlet hole 11, and the inner wall of the first protrusion 12 is connected with the first liquid inlet hole 11. In combination with Figure 1 As shown, when the one-way valve is installed, the first valve seat 1 and the second valve seat 2 are moved towards each other along the X-axis direction, and the first protrusion 12 is inserted into the first valve cavity 21 of the second valve seat 2, so that the first liquid inlet hole 11 is communicated with the first valve cavity 21; when the one-way valve is disassembled, the first valve seat 1 and the second valve seat 2 are moved away from each other along the X-axis direction, so that the insertion of the two is released.

[0036] In this way, by inserting the first protrusion 12 into the first valve cavity 21, the first valve seat 1 and the second valve seat 2 can be installed together, and it is also convenient to disassemble the first valve seat 1 and the second valve seat 2.

[0037] Further, a plurality of second protrusions 23 are annularly and spacedly arranged on the second valve seat 2, so as to abut and limit the first valve seat 1, and a shunt passage 231 is surrounded between adjacent second protrusions 23, a shunt hole 24 is arranged on the second valve seat 2 corresponding to the shunt passage 231, and the inner wall of the second protrusion 23 surrounds the first valve cavity 21, and the first valve cavity 21 is communicated with the first liquid outlet hole 22 through the shunt passage 231 and the shunt hole 24.

[0038] In combination Figure 3 As shown, the second valve seat 2 is provided with a plurality of second protrusions 23, which are annularly and spacedly arranged, and a shunt passage 231 is surrounded between adjacent two second protrusions 23, and the second valve seat 2 is also provided with a shunt hole 24 corresponding to each shunt passage 231, and the annular inner wall of the second protrusion 23 surrounds the first valve cavity 21, and after the first valve cavity 21 is inserted with the first protrusion 12 (the first valve seat 1 and the second valve seat 2 can also be connected in other ways), the second protrusion 23 abuts and limits the first valve seat 1 towards the positive X-axis end in the drawing, and the first valve seat 1 towards the negative X-axis end in the drawing. Figure 4 As shown, the dashed line in the drawing shows the general flow direction of the liquid, the liquid first enters the first liquid inlet hole 11, pushes away the valve core 4 against the elastic force of the elastic member 3 Figure 4 (not shown in the drawing), so that the liquid enters the first valve cavity 21, then enters the shunt passage 231 through the shunt hole 24, and finally flows out from the first liquid outlet hole 22.

[0039] In this way, by designing a plurality of second protrusions 23, the liquid entering the first valve cavity 21 can form multiple directional shunts, ensuring smooth flow of the liquid, and the second protrusion 23 can also abut and limit the first valve seat 1, ensuring the relative position between the first valve seat 1 and the second valve seat 2, and improving the connection reliability between the first valve seat 1 and the second valve seat 2.

[0040] Further, the second valve seat 2 is provided with a second valve cavity 25, the shunt hole 24 communicates with the first liquid outlet hole 22 through the second valve cavity 25, and the second valve cavity 25 is sleeved with the elastic member 3.

[0041] In combination with Figure 1 and Figure 3 It is shown that the second valve seat 2 is provided with a second valve cavity 25, the side wall of the second valve cavity 25 is provided with a shunt hole 24, and the second valve cavity 25 communicates with the first liquid outlet hole 22 at the reverse end of the X-axis in the figure, so that the liquid enters the second valve cavity 25 after passing through the shunt passage 231 and the shunt hole 24, and finally flows out from the first liquid outlet hole 22. The elastic member 3 is arranged in the second valve cavity 25, so that the second valve cavity 25 is sleeved with the elastic member 3, and the elastic member 3 can be guided when elastically stretching and contracting in the X-axis direction in the figure. Optionally, in combination with Figure 5 It is shown that the third protrusion 42 is arranged on the valve core 4, the third protrusion 42 is cylindrical, the elastic member 3 is a spring, and the third protrusion 42 is inserted into the spring, which can also play a limiting and guiding role.

[0042] In this way, the second valve cavity 25 can accommodate the elastic member 3 and also guide the elastic member 3. Meanwhile, the second valve cavity 25 also communicates the shunt hole 24 and the first liquid outlet hole 22, so that the liquid is collected again after shunting, facilitating the subsequent arrangement of related hydraulic structures.

[0043] Further, the first force applying part 113 and / or the second force applying part 221 are internal thread structures, which are used for threadedly connecting and cooperating with a disassembling tool.

[0044] In combination with Figure 1 It is shown that the first force applying part 113 and the second force applying part 221 are internal thread structures. When the one-way valve needs to be disassembled, the internal thread structures can be connected and cooperated with the external thread structure on the disassembling tool, so as to facilitate force applying in the X-axis direction.

[0045] In this way, the disassembling tool is detachably connected with the first valve seat 1 or the second valve seat 2 through threadedly connecting and cooperating with the internal thread structure, which facilitates force applying and disassembling operation of the one-way valve, and improves disassembling convenience.

[0046] Further, the first liquid inlet hole 11 includes a cylindrical section 111 and a gradually expanding section 112 which are communicated with each other, and the gradually expanding section 112 communicates with the first valve cavity 21.

[0047] In combination with Figure 1 and Figure 2As shown, the first liquid inlet hole 11 includes a cylindrical section 111 and a gradually expanding section 112 which are in communication with each other. The cylindrical section 111 has the same hole diameter at different positions in the X-axis direction. An internal thread structure is arranged on the inner wall of the cylindrical section 111 as a first force applying part 113. The hole diameter of the gradually expanding section 112 gradually expands in the reverse direction of the X-axis, for example Figure 2 The gradually expanding section 112 is a conical hole structure with a conical inner wall (the inner wall can also be curved, and the specific shape of the gradually expanding section 112 is not limited here as long as the hole diameter gradually expands).

[0048] In this way, the liquid first passes through the cylindrical section 111 and then enters the gradually expanding section 112, and the flow resistance is reduced, so that the liquid flows more smoothly from the first liquid inlet hole 11 into the first valve cavity 21.

[0049] Further, the outer surface of the valve core 4 is provided with a spherical surface 41 to be in sliding connection with the inner wall of the first valve cavity 21.

[0050] In combination Figure 5 As shown, the valve core 4 is similar to a disc in shape, and the side wall thereof is a spherical surface 41. The diameter of the spherical surface 41 is less than or equal to the inner diameter of the first valve cavity 21, so that the spherical surface 41 can be in sliding connection with the inner wall of the first valve cavity 21. The design of the spherical surface 41 allows the valve core 4 to have a certain swing in the first valve cavity 21.

[0051] In this way, the valve core 4 can have a certain swing in the first valve cavity 21, avoiding the valve core 4 from being stuck or jammed in the first valve cavity 21, and ensuring that the valve core 4 can be smoothly opened and closed.

[0052] Further, the outer surface of the first valve seat 1 is provided with a first sealing member 13.

[0053] In combination Figure 1 As shown, the outer surface of the first valve seat 1 is provided with a sealing installation groove, and the first sealing member 13 is an O-ring arranged in the sealing installation groove to be in sealing connection with the inner wall of the other valve cavity.

[0054] In this way, the sealing performance of the one-way valve after being installed in the other valve is ensured by the arrangement of the first sealing member 13.

[0055] The application further provides a plunger pump liquid force structure, comprising a valve body 01, a liquid suction valve 02 and a liquid discharge valve 03, the valve body 01 is provided with a second liquid inlet hole 011, a second liquid outlet hole 012, a plunger hole 013 and a mounting cavity 014 for connecting the second liquid inlet hole 011, the second liquid outlet hole 012 and the plunger hole 013, the liquid suction valve 02 is mounted in the mounting cavity 014 between the second liquid inlet hole 011 and the plunger hole 013, the liquid discharge valve 03 is mounted in the mounting cavity 014 between the plunger hole 013 and the second liquid outlet hole 012, and at least one of the liquid suction valve 02 and the liquid discharge valve 03 is a one-way valve.

[0056] In combination Figure 7 As shown in the figure, the second liquid inlet hole 011, the mounting cavity 014 and the second liquid outlet hole 012 are sequentially connected, one side of the mounting cavity 014 is further provided with the plunger hole 013, and in combination Figure 6 As shown in the figure, the liquid suction valve 02 and the liquid discharge valve 03 are mounted into the mounting cavity 014, the plunger moves in the negative direction of the Y axis in the figure in the plunger hole 013, the pressure on the side close to the plunger hole 013 of the liquid suction valve 02 is reduced, so that the liquid suction valve 02 is opened, the liquid discharge valve 03 remains closed, liquid flows into the mounting cavity 014 corresponding to the part of the plunger hole 013 through the liquid suction valve 02, then the plunger moves in the positive direction of the Y axis in the figure, so that the pressure on the side close to the plunger hole 013 of the liquid discharge valve 03 is increased, the liquid discharge valve 03 is opened, the liquid suction valve 02 remains closed, liquid flows through the liquid discharge valve 03 and finally flows out from the second liquid outlet hole 012. In this embodiment, the liquid suction valve 02 and the liquid discharge valve 03 are both one-way valves, and the liquid suction valve 02 and the liquid discharge valve 03 can be conveniently disassembled through the first force applying part 113 and the second force applying part 221.

[0057] In the plunger pump liquid force structure, at least one of the liquid suction valve 02 and the liquid discharge valve 03 is a one-way valve, the valve core 4 is movably arranged in the first valve cavity 21 of the second valve seat 2 through the detachable connection of the first valve seat 1 and the second valve seat 2, and the elastic member 3 is arranged between the valve core 4 and the second valve seat 2, so that the valve core 4 blocks the first liquid inlet hole 11 on the first valve seat 1, the one-way valve realizes the one-way check function, and the structure is relatively simple; the first force applying part 113 is arranged on the inner wall of the first liquid inlet hole 11, and the second force applying part 221 is arranged on the inner wall of the first liquid outlet hole 22, when it is needed to disassemble the one-way valve from the mounting cavity 014 or disassemble the one-way valve, the first force applying part 113 can apply force to the first valve seat 1, and the second force applying part 221 can apply force to the second valve seat 2, so that the convenience of disassembling operation of the one-way valve is improved, and the maintenance work efficiency of the plunger pump is improved.

[0058] Further, a distance sleeve 04 is arranged in the installation cavity 014, the distance sleeve 04 is provided with a first liquid passing hole 041 and a plunger accommodating hole 042 which are in communication with each other, the first liquid passing hole 041 connects the liquid suction valve 02 and the liquid discharge valve 03, the plunger accommodating hole 042 is in communication with the plunger hole 013, and the diameter of the plunger accommodating hole 042 is greater than or equal to the diameter of the plunger.

[0059] In combination Figures 6 to 8 As shown, the distance sleeve 04 has a cylindrical structure, and is provided with the plunger accommodating hole 042 on one side in addition to the first liquid passing hole 041 arranged at the center axis. After the distance sleeve 04 is arranged in the installation cavity 014, the limiting plug 043 is threadedly connected with the limiting plug installation hole 015 on the valve body 01, so that the limiting plug 043 is inserted into the limiting clamping groove 044 arranged on the distance sleeve 04, thereby limiting the distance sleeve 04 in the installation cavity 014, avoiding rotation of the distance sleeve 04. The distance sleeve 04 keeps a distance between the liquid suction valve 02 and the liquid discharge valve 03, the first liquid passing hole 041 connects the liquid outlet hole of the liquid suction valve 02 and the liquid inlet hole of the liquid discharge valve 03, and the diameter of the plunger accommodating hole 042 is greater than or equal to the diameter of the plunger, so that the plunger can be inserted into the plunger accommodating hole 042 to a certain extent.

[0060] In this way, the distance sleeve 04 can ensure that a liquid passing channel, i.e. the first liquid passing hole 041, is formed between the liquid suction valve 02 and the liquid discharge valve 03, and the plunger can be inserted into the plunger accommodating hole 042 to a certain extent through the plunger accommodating hole 042, thereby reducing the residual volume of the plunger and improving the volumetric efficiency of the plunger pump.

[0061] Further, a pressing block 05 is arranged in the installation cavity 014 to abut and limit the liquid discharge valve 03, and the pressing block 05 is provided with a second liquid passing hole 051 which connects the liquid discharge valve 03 and the second liquid outlet hole 012.

[0062] In combination Figure 6 As shown, the installation process of the plunger pump liquid force structure is exemplarily illustrated. The liquid suction valve 02 is first arranged in the installation cavity 014, then the distance sleeve 04 is arranged in the installation cavity 014 and fixed by the limiting plug 043, then the liquid discharge valve 03 is arranged in the installation cavity 014, and finally the pressing block 05 is arranged in the installation cavity 014 to abut and limit the liquid discharge valve 03, thereby limiting the related components in the installation cavity 014. Preferably, a cover plate 06 can also be arranged on the valve body 01, and the cover plate 06 is fixedly connected with the pressing block 05 by a pin shaft, thereby ensuring the limiting effect of the pressing block 05 on the liquid discharge valve 03 and ensuring that the related components in the installation cavity 014 will not be separated.

[0063] Further, the installation cavity 014 comprises a first hole 0141, a second hole 0142 and a third hole 0143 formed in the valve body 01 from the outer surface of the valve body 01, the second liquid inlet hole 011, the first hole 0141, the second hole 0142, the third hole 0143 and the second liquid outlet hole 012 are sequentially communicated, the liquid suction valve 02 and the distance sleeve 04 are installed in the first hole 0141, the liquid discharge valve 03 is installed in the second hole 0142, and the pressing block 05 is installed in the third hole 0143, the diameter of the third hole 0143 is larger than that of the second hole 0142, and the diameter of the second hole 0142 is larger than that of the first hole 0141.

[0064] In combination Figures 6 to 8 As shown in the drawings, the third hole 0143 is formed in the valve body 01 from the outer surface of the valve body 01, the second hole 0142 is formed in the third hole 0143, and the first hole 0141 is formed in the second hole 0142, so that the second liquid inlet hole 011, the first hole 0141, the second hole 0142, the third hole 0143 and the second liquid outlet hole 012 are sequentially communicated, wherein the first hole 0141, the second hole 0142 and the third hole 0143 form a stepped hole shape, the diameter of the third hole 0143 is the largest, the diameter of the second hole 0142 is the second, and the diameter of the first hole 0141 is the smallest.

[0065] Therefore, for the structure with the sealing ring on the outer surface, the inner wall of the installation cavity 014 can avoid scratching the sealing ring, for example, the liquid suction valve 02 is the above-mentioned one-way valve, the outer surface of the first valve seat 1 is provided with the first sealing member 13, when the liquid suction valve 02 is installed in the first hole 0141, the diameters of the second hole 0142 and the third hole 0143 are larger than that of the first hole 0141, the first sealing member 13 will not be scratched with the inner wall of the third hole 0143 and the inner wall of the second hole 0142, ensuring the smooth installation of the sealing ring and the sealing performance of the plunger pump liquid force structure.

[0066] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0067] For purposes of the description hereinafter, the orientations in the various figures will be described, as it is for example purposes only, as is conventional, with the front of the device, or structure, being faced upwards and the rear thereof faced downwards. Other orientations will likewise, or conversely, apply as a matter of design choice, and as such, the spatially relative terms "front", "back", "under", "above", "upper", "lower", and the like, are intended to and do describe the perceived location in space as shown in the figures as they are oriented for purposes of illustration. The spatially relative terms are intended to encompass different orientations of the device in use or in operation, for example, the latter term "in use" or "in operation" as understood herein, is intended to encompass different orientations of the device in use or in operation. For example, if a device described as above the other element or structure is turned over, then relative terms such as above or under can be reversed. Accordingly, exemplary terminology such as "above" or "below" can encompass both orientations "above" and "below". Other

[0068] In addition, it should be pointed out that the use of the words "first", "second" and the like to describe various components is merely intended to distinguish one component from another, and does not necessarily imply a special order or sequence of implementation, unless otherwise stated, and therefore should not be interpreted as limiting the scope of the present application.

[0069] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the present application to the particular examples disclosed. Indeed, various modifications can be made in the preferred embodiments without departing from the scope of the present application as recited in the claims. Accordingly, what is to be protected by the patent rights is set forth in the following claims.

Claims

1. A one-way valve characterized by, The single-way valve comprises a first valve seat, a second valve seat, an elastic member and a valve core, the first valve seat is detachably connected with the second valve seat, the first valve seat is provided with a first liquid inlet hole, the second valve seat is provided with a first valve cavity and a first liquid outlet hole, the first liquid inlet hole is communicated with the first liquid outlet hole through the first valve cavity, the valve core is movably arranged in the first valve cavity, the elastic member is connected between the valve core and the second valve seat to drive the valve core to move to block the first liquid inlet hole, a first force applying part is arranged on the inner wall of the first liquid inlet hole, and a second force applying part is arranged on the inner wall of the first liquid outlet hole.

2. The one-way valve of claim 1, wherein The first valve seat is provided with a first protrusion, the first protrusion is located at the edge of the first liquid inlet hole, and the first protrusion is in plug-in cooperation with the first valve cavity.

3. The one-way valve of claim 1, wherein, A plurality of second protrusions are annularly and spacedly arranged on the second valve seat to abut and limit the first valve seat, a shunt passage is surrounded between adjacent second protrusions, a shunt hole is arranged on the second valve seat corresponding to the shunt passage, and the inner wall of the second protrusion surrounds the first valve cavity, and the first valve cavity is communicated with the first liquid outlet hole through the shunt passage and the shunt hole.

4. The one-way valve of claim 3, wherein, The second valve seat is provided with a second valve cavity, the shunt hole is communicated with the first liquid outlet hole through the second valve cavity, and the second valve cavity sleeves the elastic member.

5. The one-way valve of claim 1, wherein, The first force applying part and / or the second force applying part is an internal thread structure, and the internal thread structure is used for threaded connection with a dismounting tool.

6. The one-way valve of claim 1, wherein, The first liquid inlet hole comprises a cylindrical section and a gradually expanding section which are communicated with each other, the gradually expanding section is communicated with the first valve cavity, and the outer surface of the valve core is provided with a spherical surface to be slidably connected with the inner wall of the first valve cavity.

7. The one-way valve of claim 1, wherein The outer surface of the first valve seat is provided with a first sealing member.

8. A fluid structure for a plunger pump, characterized by The valve body is provided with a second liquid inlet hole, a second liquid outlet hole, a plunger hole and a mounting cavity which communicates the second liquid inlet hole, the second liquid outlet hole and the plunger hole, the liquid suction valve is mounted in the mounting cavity between the second liquid inlet hole and the plunger hole, the liquid discharge valve is mounted in the mounting cavity between the plunger hole and the second liquid outlet hole, and at least one of the liquid suction valve and the liquid discharge valve adopts the single-way valve of any one of claims 1 to 7.

9. The fluid structure of the piston pump according to claim 8, characterized in that, The distance sleeve is mounted in the mounting cavity, the distance sleeve is provided with a first liquid passing hole and a plunger accommodating hole which are communicated with each other, the first liquid passing hole communicates the liquid suction valve with the liquid discharge valve, the plunger accommodating hole is communicated with the plunger hole, the diameter of the plunger accommodating hole is greater than or equal to the diameter of the plunger, and the pressing block is mounted in the mounting cavity to abut and limit the liquid discharge valve, the pressing block is provided with a second liquid passing hole which communicates the liquid discharge valve with the second liquid outlet hole.

10. The fluid structure of the piston pump according to claim 9, characterized in that, The installation cavity comprises a first hole, a second hole and a third hole opened in the valve body from the outer surface of the valve body, the second liquid inlet hole, the first hole, the second hole, the third hole and the second liquid outlet hole are communicated in sequence, the liquid suction valve and the distance sleeve are installed in the first hole, the liquid discharge valve is installed in the second hole, the pressing block is installed in the third hole, the aperture of the third hole is larger than the aperture of the second hole, and the aperture of the second hole is larger than the aperture of the first hole.

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