A pump head structure

Abstract

The application discloses a pump head structure and belongs to the technical field of radial pumps.The pump head structure comprises a pump body, wherein a first mounting hole, a second mounting hole and a third mounting hole are formed in the pump body; a plunger sleeve is mounted in the first mounting hole; a plunger cavity is arranged in the plunger sleeve; and a plunger is mounted in the plunger cavity; a liquid suction valve is mounted in the second mounting hole; a liquid discharge valve is mounted in the third mounting hole; a liquid suction flow channel and a liquid discharge flow channel are arranged on the pump body; the liquid suction flow channel is communicated with the plunger cavity through the liquid suction valve; and the liquid discharge flow channel is communicated with the plunger cavity through the liquid discharge valve.The pump head structure is easy to disassemble, and the disassembly of the liquid suction valve, the liquid discharge valve, the plunger sleeve and an oil seal assembly does not affect each other; the oil seal assembly and the plunger sleeve are designed as independent components; a leakage groove is arranged on an oil seal seat; a first leakage hole is arranged on the pump body; and water flowing down when the plunger sleeve is disassembled can flow out through the leakage groove and the first leakage hole, so that the lubricating oil is prevented from being polluted.

Description

Technical Field

[0001] This invention relates to the field of valve control technology, and in particular to a pump head structure. Background Technology

[0002] A radial piston pump is a piston pump in which the reciprocating motion of the piston or plunger is perpendicular to the drive shaft. Piston pumps have advantages such as low noise and high operating pressure. In existing radial piston pumps, the pump head is mounted circumferentially along the pump body. Typically, the axis of rotation of a radial pump is parallel to the ground, which inevitably means that the pump head structure is installed at the bottom (below the horizontal plane of the axis of rotation). This is because the pump head usually contains sealing structures and suction / discharge valves, which are wear parts. The existing structural design makes it difficult to replace these wear parts in the lower part of the pump head. Summary of the Invention

[0003] The present invention aims to at least solve the technical problems of the sealing structure and the difficulty in replacing the suction and discharge valve in the prior art.

[0004] Therefore, one object of the present invention is to provide a pump head structure, including a pump body, wherein the pump body has a first mounting hole, a second mounting hole and a third mounting hole, the first mounting hole is used to install a plunger assembly, the second mounting hole is used to install a suction valve, and the third mounting hole is used to install a discharge valve. The first mounting hole is located at a first end of the pump body, the second mounting hole is located at a second end of the pump body, and the third mounting hole is located at a third end of the pump body. The second mounting hole and the third mounting hole are respectively connected to the first mounting hole.

[0005] In some embodiments, the first end of the pump body is close to the closed end of the plunger sleeve in the plunger assembly. This structural design facilitates subsequent disassembly and maintenance of the plunger assembly.

[0006] In some embodiments, a first pressure plate is connected to the first end of the pump body; a second pressure plate is installed at the second end of the pump body; and a third pressure plate is installed at the third end of the pump body. This structural design facilitates the subsequent disassembly and maintenance of the plunger assembly.

[0007] In some embodiments, a fourth mounting hole is provided on the pump body on the side of the first mounting hole away from the first end of the pump body, and an oil seal assembly is provided in the fourth mounting hole.

[0008] In some embodiments, the plunger assembly includes a plunger sleeve and a plunger. The plunger sleeve is installed in the first mounting hole from a first end of the first mounting hole. The plunger sleeve has a plunger cavity. The plunger extends into the plunger cavity from one side of the oil seal assembly. A plurality of seals are provided between the plunger sleeve and the plunger. An oil seal is provided between the oil seal assembly and the plunger.

[0009] In some embodiments, the pump body is provided with a suction channel and a discharge channel. The suction channel is connected to the plunger cavity through the suction valve, and the discharge channel is connected to the plunger cavity through the discharge valve.

[0010] In some embodiments, the oil seal assembly includes an oil seal seat and the oil seal, the oil seal is mounted on the oil seal seat, the oil seal seat has a leakage groove on the side facing the plunger sleeve, and the pump body has a first leakage hole communicating with the leakage groove.

[0011] In some embodiments, the pump body is provided with a second leakage hole, the first end of the second leakage hole is connected to the plunger cavity, and the second end of the second leakage hole is connected to the liquid suction channel.

[0012] In some embodiments, the plunger sleeve and the closed end of the plunger near the plunger sleeve form a pump chamber, and the pump chamber is connected to the suction valve through a first liquid passage hole.

[0013] In some embodiments, when the plunger moves to its farthest end, the end of the plunger near the closed end of the plunger sleeve is located between the axis of the drain valve and the first edge of the first through hole, where the first edge is the farthest end of the first through hole from the plunger.

[0014] The pump head structure of the present invention has the following beneficial effects:

[0015] The pump head structure disclosed herein is easy to disassemble, and the disassembly of the suction valve, discharge valve, plunger sleeve, and oil seal assembly does not affect each other. Considering the arrangement of the radial plunger pump head, when the pump head is above the crankshaft axis, disassembling the plunger sleeve may cause the medium in the plunger cavity to flow into the lubricating oil. This invention designs the oil seal assembly and the plunger sleeve as independent structural components. The oil seal seat is provided with a leakage groove, and the pump body is provided with a first leakage hole. Water flowing down when the plunger sleeve is disassembled can flow out through the leakage groove and the first leakage hole, thereby avoiding contamination of the lubricating oil. This invention can ensure a low clearance volume (dead zone volume), that is, when the plunger moves to the farthest end, the volume of the pump cavity is as small as possible, which improves the working efficiency of the plunger pump. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic cross-sectional view of a pump head structure according to an embodiment of the present invention;

[0018] Figure 2 This is a longitudinal cross-sectional schematic diagram of a pump head structure according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of a valve body for a pump head structure in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a suction valve for a pump head structure in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of a drain valve for a pump head structure in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of an oil seal seat for a pump head structure in an embodiment of the present invention.

[0023] Figure label:

[0024] 100. Pump body; 101. Suction channel; 102. Discharge channel; 103. Suction valve port; 104. Suction valve; 1041. Suction valve spring seat; 1042. Suction valve seat; 1043. Suction valve core; 1044. Suction spring; 105. Discharge valve port; 106. Discharge valve; 1061. Discharge valve seat; 1062. Discharge valve spring seat; 1063. Discharge valve core; 1064. Discharge spring; 107. First mounting hole; 108. Second mounting hole; 109. Third mounting hole; 110. First Leakage hole; 111, Fourth mounting hole; 112, Second leakage hole; 113, First pressure plate; 114, Second pressure plate; 115, Third pressure plate; 116, Lubricating oil groove; 117, Oil inlet hole; 118, First fluid passage hole; 119, Second fluid passage hole; 200, Plunger sleeve; 201, Plunger cavity; 202, Pump cavity; 203, First seal; 204, Second seal; 300, Plunger; 400, Oil seal assembly; 401, Oil seal seat; 402, Oil seal; 403, Leakage groove; 404, Second threaded hole. Detailed Implementation

[0025] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0026] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of the invention will be apparent to those skilled in the art.

[0027] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0028] These and other features of the invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0029] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0030] The above and other aspects, features and advantages of the invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0031] Specific embodiments of the invention are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the invention, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the invention in various ways with substantially any suitable detailed structure.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0034] In the description of this invention, "a plurality of" means two or more.

[0035] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0036] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0037] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a pump head structure that achieves liquid suction and discharge functions by controlling the reciprocating motion direction of the plunger 300. The pump head structure includes a pump body 100, with a first mounting hole 107 at its first end. A plunger sleeve 200 is installed in the first mounting hole 107, and a plunger cavity 201 is provided inside the plunger sleeve 200. A plunger 300 is installed inside the plunger cavity 201, and the end of the plunger 300 forms a pump cavity 202 with the inner wall of the plunger sleeve 200. Under the drive of a driving device, the plunger 300 slides in the plunger cavity 201, causing the pump cavity 202 to expand or shrink, thereby realizing the liquid suction and discharge functions of the pump head. Specifically, the first end of the pump body 100 is close to the closed end of the plunger sleeve 200 in the plunger assembly. This structural design facilitates the subsequent disassembly and maintenance of the plunger assembly.

[0040] Furthermore, in this embodiment, a suction channel 101 and a discharge channel 102 are provided on both sides of the pump body 100 along the radial direction of the plunger sleeve 200. Both the suction channel 101 and the discharge channel 102 are connected to the pump chamber 202. A second mounting hole 108 is also provided at the second end of the pump body 100. A suction valve 104 is installed in the second mounting hole 108. The suction valve 104 is provided with a suction valve port 103. The suction channel 101 is connected to the pump chamber 202 through the suction valve port 103. The suction valve 104 is used to control the opening and closing of the suction valve port 103.

[0041] Furthermore, a third mounting hole 109 is provided at the third end of the pump body 100, and a drain valve 106 is installed on the third mounting hole 109. The drain valve 106 is provided with a drain valve port 105. The pump chamber 202 and the drain channel 102 are connected through the drain valve port 105. The drain valve 106 is used to control the opening and closing of the drain valve port 105. Preferably, both the suction valve 104 and the drain valve 106 are one-way valves.

[0042] In this embodiment, when the plunger 300 slides to enlarge the pump chamber 202, the pressure inside the pump chamber 202 decreases, and a pressure difference is generated on both sides of the suction valve port 103. The pressure in the suction channel 101 is greater than the pressure inside the pump chamber 202, the suction valve 104 opens, the suction valve port 103 opens, and the medium in the suction channel 101 enters the pump chamber 202 through the suction valve port 103, thereby realizing the suction function of the pump head structure.

[0043] In this embodiment, when the plunger 300 slides to reduce the size of the pump chamber 202, the pressure inside the pump chamber 202 increases, and a pressure difference is generated at the drain valve port 105. The pressure in the drain channel 102 is less than the pressure inside the pump chamber 202, so the drain valve 106 opens, the drain valve port 105 opens, and the medium inside the pump chamber 202 flows into the drain channel 102, thereby realizing the draining function of the pump head structure.

[0044] Specifically, such as Figure 4As shown, the suction valve 104 includes a suction valve spring seat 1041, a suction valve seat 1042, a suction valve core 1043, and a suction spring 1044. One end of the suction spring 1044 abuts against the suction spring seat 1041, and the other end is connected to the suction valve core 1043. The side of the suction valve core 1043 away from the suction spring 1044 is connected to the suction valve port 103 of the suction valve seat 1042. More specifically, the ends of the suction valve seat 1042 and the suction valve spring seat 1041 away from the plunger sleeve 200 are connected. The entire suction valve 104 is replaced. During disassembly, it is disassembled using a tool through the first threaded hole 120 on the suction valve seat 1042.

[0045] Specifically, such as Figure 5 As shown, the drain valve 106 includes a drain valve seat 1061, a drain valve spring seat 1062, a drain valve core 1063, and a drain spring 1064. One end of the drain spring 1064 is connected to the drain spring seat 1062, and the other end is connected to the drain valve core 1063. The drain valve seat 1061 is connected to the side of the drain valve core 1063 away from the drain spring 1064. More specifically, the ends of the drain valve seat 1061 and the drain valve spring seat 1062 are connected. When replacing the drain valve 106, the entire drain valve 106 is replaced together. The entire drain valve 106 can be easily pulled out by using a disassembly tool through the first threaded hole 120 on the drain valve spring seat 1062.

[0046] A first pressure plate 113 is connected to the pump body 100 at the port of the first mounting hole 107 for fixing the plunger sleeve 200; a second pressure plate 114 is connected to the pump body 100 at the port of the second mounting hole 108 for fixing the suction valve 104; and a third pressure plate 115 is connected to the pump body 100 at the port of the third mounting hole 109 for fixing the discharge valve 106.

[0047] In this embodiment, when it is necessary to replace vulnerable parts in the pump head structure, such as the suction valve 104 or the discharge valve 106, it is only necessary to remove the second pressure plate 114 and remove the suction valve 104 from the second mounting hole 108, or remove the third pressure plate 115 and remove the discharge valve 106 from the third mounting hole 109. The replacement of the suction valve 104 and the discharge valve 106 does not interfere with each other, and the replacement of the suction valve 104 or the discharge valve 106 does not involve the disassembly of the seals of the plunger sleeve 200. Therefore, there is no need to worry about the medium leaking into the lubricating oil used to lubricate the plunger 300.

[0048] To prevent the medium in the pump chamber 202 from leaking through the gap between the plunger sleeve 200 and the plunger 300, a seal is installed between the plunger sleeve 200 and the plunger 300. Preferably, the seal is a sealing ring. The seal includes a first seal 203 and a second seal 204 disposed below the first seal 203. The two sealing structures enhance the sealing performance.

[0049] A fourth mounting hole 111 is provided below the first mounting hole 107. An oil seal assembly 400 is installed in the fourth mounting hole 111. The oil seal assembly 400 and the plunger sleeve 200 are independent components, so the oil seal assembly 400 will not be affected when the plunger sleeve 200 is disassembled. When replacing the seal, first pull out the plunger sleeve 200. The water in the plunger cavity 201 will be sealed by the oil seal assembly 400 and then discharged through the first leakage hole 110 on the pump body 100. Finally, pull out the oil seal assembly 400 to replace the oil seal.

[0050] Specifically, in this embodiment, the oil seal assembly 400 includes an oil seal seat 401 and an oil seal 402. The oil seal 402 is installed in the oil seal seat 401 to prevent lubricating oil from the plunger 300 from entering the plunger sleeve 200. More specifically, as... Figure 6 As shown, a leakage groove 403 is provided on the side of the oil seal seat 401 near the plunger sleeve 200.

[0051] The radial pump described in this invention is generally used for fluid supply in underground coal mine supports. Its lubricating medium is lubricating oil, and its working medium is water. Therefore, the seal inside the plunger sleeve 200 is mainly used to seal water, and the oil seal 402 inside the oil seal seat 401 is used to seal lubricating oil. When either or both leak, the leaked liquid will be discharged through the leakage groove 403 from the first leakage hole 110. This structural design can prevent leaked water from flowing into the lubricating oil and contaminating it, and can also detect whether the seal has failed. Specifically, if water flows continuously from the first leakage hole 110, it indicates that the seal inside the plunger sleeve 200 has failed; if oil flows continuously from the first leakage hole 110, it indicates that the oil seal 402 has failed; if both water and oil flow from the first leakage hole 110, it indicates that both the seal inside the plunger sleeve 200 and the oil seal 402 have failed.

[0052] Specifically, the oil seal seat 402 is also provided with a second threaded hole 404 to assist the oil seal seat 401 in being disassembled from the first mounting hole 107.

[0053] Furthermore, in this embodiment, the pump body 100 is provided with a second leakage hole 112. The first end of the second leakage hole 112 is connected to the plunger cavity 201, and the first end is located between the first seal 203 and the second seal 204. The second end of the second leakage hole 112 is connected to the suction channel 101. When the first seal 203 fails, the medium can flow out through the second leakage hole 112. When the first seal 203 is intact, the medium in the suction channel 101 enters the gap between the plunger 300 and the plunger sleeve 200 through the second leakage hole 112 to lubricate and cool the plunger 300.

[0054] The pump body 100 is provided with a lubricating oil groove 116 and an oil inlet hole 117. The lubricating oil groove 116 is arranged around the plunger 300. The oil inlet hole 117 is connected to the lubricating oil groove 116. Lubricating oil enters the lubricating oil groove 116 through the oil inlet hole 117 to lubricate the plunger 300.

[0055] The suction valve 104 is connected to the pump chamber 202 through the first liquid passage 118, and the discharge valve 106 is connected to the pump chamber 202 through the second liquid passage 119. Specifically, the first liquid passage 118 is a cylindrical hole, which allows the medium to enter the pump chamber 202; the second liquid passage 119 is a conical hole, and the radial dimension of the conical hole decreases from the direction close to the pump chamber 202 to the direction far away from the pump chamber 202, which is conducive to the discharge of the medium.

[0056] To improve the efficiency of the plunger pump, a low clearance volume (dead zone volume) is required, meaning the volume of the pump chamber 202 should be as small as possible when the plunger moves to its farthest point. Specifically, when the plunger 300 moves to its farthest point, the end of the plunger 300 near the plunger sleeve is located between the axis of the drain valve 106 and the first edge of the first through hole 118, where the first edge is the farthest point of the first through hole from the plunger 300.

[0057] The pump head structure disclosed herein is easy to disassemble, and the disassembly of the suction valve 104, discharge valve 106, plunger sleeve 200, and oil seal assembly 400 does not affect each other. Considering the arrangement of the radial plunger pump heads, when the pump head is above the crankshaft axis, disassembling the plunger sleeve 200 may cause the medium in the plunger cavity 201 to flow into the lubricating oil. The present invention designs the oil seal assembly 400 and the plunger sleeve 200 as independent structural components. The oil seal seat 401 is provided with a leakage groove 403, and the pump body 100 is provided with a first leakage hole 110. Water flowing down when the plunger sleeve 200 is disassembled can flow out through the leakage groove 403 and the first leakage hole 110, thereby avoiding contamination of the lubricating oil. The present invention can ensure a low clearance volume (dead zone volume), that is, when the plunger moves to the farthest end, the volume of the pump cavity 202 is as small as possible, which improves the working efficiency of the plunger pump.

Claims

1. A pump head structure, characterized in that, The pump includes a pump body, on which a first mounting hole, a second mounting hole, and a third mounting hole are provided. The first mounting hole is used to install a plunger assembly, the second mounting hole is used to install a suction valve, and the third mounting hole is used to install a discharge valve. The first mounting hole is located at a first end of the pump body, the second mounting hole is located at a second end of the pump body, and the third mounting hole is located at a third end of the pump body. The second mounting hole and the third mounting hole are respectively connected to the first mounting hole. The first end of the pump body is close to the closed end of the plunger sleeve in the plunger assembly; A first pressure plate is connected to the first end of the pump body; a second pressure plate is installed at the second end of the pump body; and a third pressure plate is installed at the third end of the pump body. A fourth mounting hole is provided on the pump body on the side of the first mounting hole away from the first end of the pump body, and an oil seal assembly is provided in the fourth mounting hole.

2. The pump head structure according to claim 1, characterized in that, The plunger assembly includes a plunger sleeve and a plunger. The plunger sleeve is installed in the first mounting hole from the first end of the first mounting hole. The plunger sleeve has a plunger cavity. The plunger extends into the plunger cavity from one side of the oil seal assembly. Multiple seals are provided between the plunger sleeve and the plunger. An oil seal is provided between the oil seal assembly and the plunger.

3. The pump head structure according to claim 2, characterized in that, The pump body is provided with a suction channel and a discharge channel. The suction channel is connected to the plunger cavity through the suction valve, and the discharge channel is connected to the plunger cavity through the discharge valve.

4. The pump head structure according to claim 2, characterized in that, The oil seal assembly includes an oil seal seat and an oil seal. The oil seal is installed on the oil seal seat. The oil seal seat has a leakage groove on the side facing the plunger sleeve. The pump body has a first leakage hole communicating with the leakage groove.

5. The pump head structure according to claim 3, characterized in that, The pump body is provided with a second leakage hole. The first end of the second leakage hole is connected to the plunger cavity, and the second end of the second leakage hole is connected to the liquid suction channel.

6. The pump head structure according to claim 3, characterized in that, The plunger sleeve and the closed end of the plunger near the plunger sleeve form a pump chamber, and the pump chamber is connected to the suction valve through a first liquid passage hole.

7. The pump head structure according to claim 6, characterized in that, When the plunger moves to its farthest point, the end of the plunger near the closed end of the plunger sleeve is located between the axis of the drain valve and the first edge of the first liquid passage, where the first edge is the farthest point of the first liquid passage from the plunger.

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