Hydraulic pump cylinder body

Abstract

The embodiment of the utility model discloses a hydraulic pump cylinder body, which relates to the technical field of miniature high-pressure pumps, and comprises a cylinder body and a plunger mechanism, the cylinder body is provided with a first cavity and a liquid channel, the liquid channel is communicated with the first cavity, and the liquid channel is connected with a liquid inlet and a liquid outlet; the plunger mechanism comprises a first piston, and a skirt belt part is arranged on the side, close to the liquid channel, of the first piston. Friction loss of piston movement to the inner wall of the cylinder body is reduced, and the service life of the cylinder body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro high-pressure pumps, in particular to a hydraulic pump cylinder. Background Art

[0002] The inner wall of the cylinder of the micro pump and the piston have high-frequency friction, which causes great loss to the cylinder. How to reduce the friction between the connecting parts and the piston and improve the durability of the cylinder has always been the focus of research for technicians in this field. Utility Model Content

[0003] The technical problem to be solved by the embodiments of the utility model is that the cylinder of the micro pump is subject to large friction loss and poor durability.

[0004] In order to solve the above problems, the embodiment of the utility model discloses a hydraulic pump cylinder body, which reduces the friction loss of the cylinder body during the movement of the piston and achieves the effect of extending the service life of the cylinder body.

[0005] The utility model provides a hydraulic pump cylinder body, which comprises a cylinder body and a plunger mechanism; the cylinder body is provided with a first cavity and a liquid channel, the liquid channel is communicated with the first cavity, and the liquid channel is connected with a liquid inlet and a liquid outlet; the plunger mechanism comprises a first piston, and a skirt portion is provided on a side of the first piston close to the liquid channel.

[0006] A further technical solution is that it further comprises a first plug, the cylinder body is further provided with a first opening, the first opening is communicated with the liquid channel, and the first plug is embedded in the first opening.

[0007] A further technical solution is that it also includes a first check valve, the cylinder body is further provided with a second cavity, the second cavity is connected to the liquid channel, the second cavity is on one side of the first cavity, and the first check valve is arranged in the second cavity.

[0008] A further technical solution is that the liquid outlet is arranged on the second cavity, and the liquid outlet is above the first check valve.

[0009] A further technical solution is that it further comprises a second plug, the cylinder body is further provided with a second opening, the second cavity is communicated with the second opening, and the second plug is embedded in the second opening.

[0010] A further technical solution is that it also includes a second check valve, the liquid inlet is arranged on the liquid channel, and the second check valve is on the liquid inlet.

[0011] A further technical solution is that the first cavity, the liquid channel, the second cavity, the liquid outlet and the liquid inlet are integrally formed.

[0012] A further technical solution is that the plunger mechanism also includes a second piston, the second piston is connected to the first piston, and the second piston is on a side away from the liquid channel.

[0013] A further technical solution is that it also includes a sealing ring, the inner wall of the first cavity is provided with a connecting piece, the sealing ring is sleeved on the connecting piece, and the first piston is embedded in the connecting piece.

[0014] A further technical solution is that the cylinder body is provided with cooling fins.

[0015] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:

[0016] On the one hand, the skirt portion can fit with the inner wall of the first cavity, so that negative pressure is generated when the skirt portion moves back and forth in the first cavity. On the other hand, the skirt portion has an elastic shock-absorbing effect, so that when the skirt portion moves back and forth in the first cavity, the friction loss between the skirt portion and the inner wall of the first cavity is reduced, thereby improving the durability of the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a hydraulic pump cylinder structure provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of another hydraulic pump cylinder structure provided by an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of another hydraulic pump cylinder structure provided by an embodiment of the utility model;

[0021] Figure 4 A schematic diagram of another hydraulic pump cylinder structure provided by an embodiment of the utility model;

[0022] Figure 5 for Figure 4 Sectional view at AA in the middle;

[0023] Figure 6 for Figure 4 Cross-section at the middle BB;

[0024] Figure 7 A schematic diagram of another hydraulic pump cylinder structure provided by an embodiment of the utility model;

[0025] Figure 8 for Figure 7 Sectional view at CC;

[0026] Fig. 9 for Figure 7 Cross-sectional view at DD in the middle.

[0027] Reference numerals

[0028] Cylinder body 1, plunger mechanism 2, first cavity 11, liquid channel 12, first piston 21, skirt portion 211, tightening portion 212, first plug 3, first buffer groove 31, first annular groove 32, first opening 13, first check valve 41, liquid outlet 141, second plug 5, second buffer groove 51, second annular groove 52, second opening 15, second check valve 42, liquid inlet 121, second piston 22, sealing ring 6, connecting piece 7, cooling fins 16. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0030] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0031] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0032] See also Figure 1-9The embodiment of the utility model provides a hydraulic pump cylinder 1. The hydraulic pump cylinder 1 includes a cylinder 1 and a plunger mechanism 2; the cylinder 1 is provided with a first cavity 11 and a liquid channel 12, the liquid channel 12 is connected to the first cavity 11, and the liquid channel 12 is connected with a liquid inlet 121 and a liquid outlet 141; the plunger mechanism 2 includes a first piston 21, and a skirt portion 211 is provided on a side of the first piston 21 close to the liquid channel 12. The specific description of each component is as follows:

[0033] In this embodiment, the first piston 21 is embedded in the first cavity 11, and the skirt portion 211 of the first piston 21 is in contact with the inner wall of the first cavity 11. The connecting rod drives the first piston 21 to make a reciprocating motion in the connecting member 7. The friction between the first piston 21 and the inner wall of the first cavity 11 generates negative pressure, causing the liquid to flow in the liquid channel 12. A liquid inlet 121 is provided on one side of the liquid channel 12, and a liquid outlet 141 is provided on the other side of the liquid channel 12. Usually, check valves are also provided at the liquid inlet 121 and the liquid outlet 141, respectively, so that the first piston 21 and the first cavity 11 generate negative pressure due to friction, causing the liquid to flow in the liquid channel 12 from the liquid inlet 121 to the liquid outlet 141. On the one hand, the skirt portion 211 can fit with the inner wall of the first cavity 11, so that the skirt portion 211 generates negative pressure when it moves back and forth in the first cavity 11. On the other hand, the skirt portion 211 has an elastic shock-absorbing effect, so that when the skirt portion 211 moves back and forth in the first cavity 11, the skirt portion 211 and the inner wall of the first cavity 11 reduce friction loss, thereby improving the durability of the cylinder body 1. In one embodiment, the side wall of the first piston 21 is also provided with a narrowing portion, which prevents the side wall of the first piston 21 from completely fitting with the inner wall of the first cavity 11, thereby reducing friction loss, improving the durability of the cylinder body 1, and extending the service life of the cylinder body 1.

[0034] In one embodiment, the cylinder body 1 is made of stainless steel, and the stainless steel material complies with the national GB 4806.9-2016 standard certification, that is, food-grade stainless steel. Generally, the content of harmful elements contained in food-grade stainless steel must be lower than the range of national standards, and the harmful elements mainly include sulfur, phosphorus, lead, and hexavalent chromium. By making the cylinder body 1 of food-grade stainless steel, harmful elements are avoided when the liquid flows in the liquid channel 12.

[0035] The technical effects that the hydraulic pump cylinder 1 can achieve are as follows:

[0036] On the one hand, the skirt portion 211 can fit with the inner wall of the first cavity 11, so that the skirt portion 211 generates negative pressure when it moves back and forth in the first cavity 11. On the other hand, the skirt portion 211 has an elastic shock-absorbing effect, so that when the skirt portion 211 moves back and forth in the first cavity 11, the friction loss between the skirt portion 211 and the inner wall of the first cavity 11 is reduced, thereby improving the durability of the cylinder body 1.

[0037] Continue to see Figure 1-9 In this embodiment, a first plug 3 is further included. The cylinder body 1 is provided with a first opening 13 . The first opening 13 is communicated with the liquid channel 12 . The first plug 3 is embedded in the first opening 13 .

[0038] Specifically, the cylinder body 1 is provided with a first opening 13, which is at one end of the liquid channel 12. The first opening 13 can simplify the process of integrally forming the liquid channel 12. In this embodiment, the aperture of the liquid channel 12 is equal to the aperture of the first opening 13, and the first opening 13 is at the same level as the first cavity 11. The inner wall of the integrally formed liquid channel 12 can be conveniently processed through the first opening 13, and the sealing of the liquid channel 12 is achieved by embedding the first plug 3 into the first opening 13. The first plug 3 is provided with a first buffer groove 31 and a first annular groove 32. The first buffer groove 31 is connected to the liquid channel 12, and the inner wall of the liquid channel 12 surrounds the first annular groove 32. Specifically, a first buffer groove 31 is provided at the center of the top of the first plug 3, and a first annular groove 32 is provided on the side of the first plug 3. When the liquid flows rapidly in the liquid channel 12, it will also impact the first plug 3, causing the first plug 3 to fall off from the second opening 15. By installing the first buffer groove 31 on the first plug 3, the impact pressure of the liquid on the first plug 3 will squeeze the surroundings of the first buffer groove 31, increasing the friction between the first plug 3 and the inner wall of the liquid channel 12, so that the first plug 3 is firmly embedded in the first opening 13, avoiding the first plug 3 from detaching from the first opening 13. By installing the first annular groove 32 on the first plug 3, the difficulty of embedding the first plug 3 into the first opening 13 can be reduced.

[0039] Furthermore, it also includes a first check valve 41. The cylinder body 1 is also provided with a second cavity, the second cavity is communicated with the liquid channel 12, the second cavity is on one side of the first cavity 11, and the first check valve 41 is arranged in the second cavity.

[0040] Specifically, the first check valve 41 includes a check valve, which is a common fluid control device. Its working principle is based on the movement of a valve flap or a valve disc, and prevents backflow by controlling the flow direction of the fluid. The structure of the check valve includes components such as a valve body, a valve cover, a valve flap or a valve disc, a spring or a gravity device, and a guide device. The functions of the check valve mainly include preventing backflow in a pump station, backflow in a pipeline, water hammer phenomenon, and protecting equipment and systems. In this embodiment, the first check valve 41 is used to prevent the liquid entering the first cavity 11 from flowing back to the liquid channel 12. The second cavity is at the same horizontal plane as the first cavity 11, and the space at the same horizontal plane as the first cavity 11 can be fully utilized.

[0041] Furthermore, the liquid outlet 141 is provided on the second cavity, and the liquid outlet 141 is above the first check valve 41 .

[0042] Specifically, the second cavity is on the same horizontal plane as the first cavity 11 , and the liquid outlet 141 is above the first check valve 41 , so that the liquid is transported vertically upward.

[0043] Furthermore, a second plug 5 is included. The cylinder body 1 is also provided with a second opening 15 . The second cavity is communicated with the second opening 15 . The second plug 5 is embedded in the second opening 15 .

[0044] Specifically, the second opening 15 is provided on the cylinder body 1 to simplify the process of integrally forming the second cavity. The aperture of the second opening 15 is equal to the diameter of the second cavity. The inner wall of the second cavity obtained by integrally forming can be conveniently processed through the second opening 15, and the sealing of the second cavity is achieved by inserting the second plug into the second opening. The second plug 5 is provided with a second buffer groove 51 and a second annular groove 52. The second buffer groove 51 is connected to the liquid channel 12, and the inner wall of the liquid channel 12 surrounds the second annular groove 52. Specifically, a second buffer groove 51 is provided at the center of the top of the second plug 5, and a second annular groove 52 is provided on the side of the second plug 5. When the liquid flows rapidly in the liquid channel 12, it will also impact the second plug 5, causing the second plug 5 to fall off from the second opening 15. By installing the second buffer groove 51 on the second plug 5, the impact pressure of the liquid on the second plug 5 will squeeze the surroundings of the second buffer groove 51, increasing the friction between the second plug 5 and the inner wall of the liquid channel 12, so that the second plug 5 is firmly embedded in the second opening 15, avoiding the second plug 5 from detaching from the second opening 15. By installing the second annular groove 52 on the second plug 5, the difficulty of embedding the second plug 5 into the second opening 15 can be reduced.

[0045] Furthermore, it also includes a second check valve 42 , the liquid inlet 121 is arranged on the liquid channel 12 , and the second check valve 42 is on the liquid inlet 121 .

[0046] Specifically, the second check valve 42 includes a check valve, which is a common fluid control device. Its working principle is based on the movement of a valve flap or a valve disc, and prevents backflow by controlling the flow direction of the fluid. The structure of the check valve includes components such as a valve body, a valve cover, a valve flap or a valve disc, a spring or a gravity device, and a guide device. The functions of the check valve mainly include preventing backflow in a pump station, backflow in a pipeline, water hammer phenomenon, and protecting equipment and systems. In this embodiment, the liquid inlet 121 is below the first cavity 11, and the second check valve 42 is used to prevent the liquid entering the liquid channel 12 from flowing out from the liquid inlet 121.

[0047] Furthermore, the first cavity 11 , the liquid channel 12 , the second cavity, the liquid outlet 141 , and the liquid inlet 121 are integrally formed.

[0048] Specifically, the one-piece molding process refers to the process of completing the molding of the entire part in one mold at one time. The one-piece molding process is relatively simple, and the required contours, holes, surface treatments, etc. can be completed in one mold, which can greatly reduce production time and costs, while improving the production accuracy and repeatability of parts.

[0049] Furthermore, the plunger mechanism 2 further includes a second piston 22 , the second piston 22 is connected to the first piston 21 , and the second piston 22 is on a side away from the liquid channel 12 .

[0050] Specifically, the second piston 22 is connected to the connecting rod and the first piston 21 respectively. The connecting rod drives the second piston 22 and the first piston 21 to perform reciprocating motion in the first cavity 11. The second piston 22 is used as an intermediate piece connecting the first piston 21 and the connecting rod. The first piston 21 and / or the second piston 22 can be replaced according to the degree of wear and tear, thereby achieving the effect of high resource utilization.

[0051] Furthermore, the first piston 21 is sleeved on the second piston 22 .

[0052] In this embodiment, a groove is provided at one end of the first piston 21 away from the liquid channel 12, and a protruding structure is provided at the second piston 22. The groove of the first piston 21 is wrapped around the protruding structure of the second piston 22, that is, the first piston 21 wraps around a part of the second piston 22, so that the connecting rod drives the second piston 22 and the first piston 21 to make reciprocating motion in the first cavity 11. In one embodiment, the groove of the first piston 21 can also completely wrap around the second piston 22. By having the first piston 21 sleeved on the second piston 22, the first piston 21 and the second piston 22 can be detachably connected, and the first piston 21 and / or the second piston 22 can be replaced according to the degree of wear and tear, thereby further achieving the effect of high resource utilization.

[0053] Furthermore, it also includes a sealing ring 6 , an inner wall of the first cavity 11 is provided with a connecting piece 7 , the sealing ring 6 is sleeved on the connecting piece 7 , and the first piston 21 is embedded in the connecting piece 7 .

[0054] Specifically, the sealing ring 6 is elastic and is usually made of rubber material. The connecting piece 7 is a cylindrical component. The connecting piece 7 is made of stainless steel, and the stainless steel material complies with the national standard GB 4806.9-2016 certification, that is, food-grade stainless steel. In this embodiment, the connecting piece 7 is embedded in the first cavity 11 of the cylinder body 1, and the sealing ring 6 is sleeved on the connecting piece 7 so that the sealing ring 6 is in the gap between the connecting piece 7 and the first cavity 11. On the one hand, the connecting piece 7 and the cylinder body 1 squeeze the sealing ring 6 to improve the air tightness. On the other hand, the sealing ring 6 serves as an intermediate piece for the buffer connection between the connecting piece 7 and the cylinder body 1, which can reduce the wear of the connecting piece 7 and the cylinder body 1 during the loading and unloading process, and improve the durability of the connecting piece 7 and the cylinder body 1.

[0055] Furthermore, the cylinder body 1 is provided with cooling fins 16 .

[0056] Specifically, the heat dissipation fins 16 have a large heat dissipation surface area and a good heat dissipation effect. A plunger mechanism 2 is provided inside the cylinder body 1. The heat dissipation fins 16 are installed on the outer surface of the cylinder body 1. The heat of the plunger mechanism 2 is transferred through the cylinder body 1 and finally dissipated from the surface of the heat dissipation fins 16, thereby realizing rapid heat dissipation of the plunger pump.

[0057] Furthermore, the cylinder body 1, the liquid channel 12, the first cavity 11, the second cavity, the first opening 13, the second opening 15 and the heat dissipation fins 16 are integrally formed.

[0058] Specifically, the one-piece molding process refers to the process of completing the molding of the entire part in one mold at one time. The one-piece molding process is relatively simple, and the required contours, holes, surface treatment, etc. can be completed in one mold, which can greatly reduce production time and cost, and at the same time can improve the production accuracy and repeatability of parts. In this embodiment, the cylinder body 1 is provided with a first opening 13 and a second opening 15, which can efficiently complete the molding and surface treatment of the liquid channel 12, thereby reducing production time and cost.

[0059] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

[0066] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A hydraulic pump cylinder, characterized in that: It includes a cylinder body and a plunger mechanism; The cylinder body is provided with a first cavity and a liquid channel, the liquid channel is communicated with the first cavity, and the liquid channel is connected with a liquid inlet and a liquid outlet; The plunger mechanism comprises a first piston, and a skirt portion is provided on a side of the first piston close to the liquid channel.

2. The hydraulic pump cylinder according to claim 1, characterized in that: It also includes a first plug. The cylinder body is also provided with a first opening, the first opening is communicated with the liquid channel, and the first plug is embedded in the first opening.

3. The hydraulic pump cylinder according to claim 1, characterized in that: It also includes a first check valve. The cylinder body is further provided with a second cavity, the second cavity is communicated with the liquid channel, the second cavity is on one side of the first cavity, and the first check valve is arranged in the second cavity.

4. The hydraulic pump cylinder according to claim 3, characterized in that: The liquid outlet is arranged on the second cavity, and the liquid outlet is above the first check valve.

5. The hydraulic pump cylinder according to claim 3, characterized in that: It also includes a second plug. The cylinder body is also provided with a second opening. The second cavity is communicated with the second opening, and the second plug is embedded in the second opening.

6. The hydraulic pump cylinder according to claim 4, characterized in that: It also includes a second check valve, the liquid inlet is arranged on the liquid channel, and the second check valve is on the liquid inlet.

7. The hydraulic pump cylinder according to claim 6, characterized in that: The first cavity, the liquid channel, the second cavity, the liquid outlet and the liquid inlet are integrally formed.

8. The hydraulic pump cylinder according to claim 1, characterized in that: The plunger mechanism further includes a second piston, the second piston is connected to the first piston, and the second piston is on a side away from the liquid channel.

9. The hydraulic pump cylinder according to claim 1, characterized in that: It also includes a sealing ring. The inner wall of the first cavity is provided with a connecting piece. The sealing ring is sleeved on the connecting piece. The first piston is embedded in the connecting piece.

10. The hydraulic pump cylinder according to claim 1, characterized in that: The cylinder body is provided with heat dissipation fins.

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