Self-cooling reciprocating pump and control method thereof

Abstract

The application provides a self-cooling reciprocating pump and a control method thereof. The self-cooling reciprocating pump comprises a power assembly and a main pump assembly. The power assembly comprises a shell and a core. The shell comprises a containing cavity. The core is installed in the containing cavity and coaxially connected with the shell. A radial cavity wall of the containing cavity cooperates with an outermost radial surface of the core to form a medium cavity. A first pipe is arranged on a pump side of the shell. The first pipe is used for connecting a medium source. The medium source is used for providing cooling medium into the power assembly and the pump body assembly. The first pipe is in communication with the medium cavity. The main pump assembly comprises a heat exchange cavity and a second pipe. The heat exchange cavity is in communication with the medium cavity and the second pipe. The cooling medium exchanges heat with the main pump assembly in the heat exchange cavity. The self-cooling reciprocating pump can efficiently realize the cooling of the pump body. The control method of the self-cooling reciprocating pump can control the temperature of the pump body. The control method is simple and efficient, and the service life of the pump body is improved.

Description

Technical Field

[0001] This invention relates to the field of reciprocating pump technology, and in particular to a self-cooling reciprocating pump and its control method. Background Technology

[0002] Reciprocating pumps, also known as plunger pumps, are devices that rely on the reciprocating motion of plunger assemblies inside the pump body to change the volume and achieve liquid suction and discharge. They are widely used in high-pressure and high-flow fields, such as high-pressure cleaners.

[0003] During operation, electrically driven reciprocating pumps generate electromagnetic heat. The mechanical movement of the plunger assembly inside the pump body causes friction, and the energy lost due to friction is also converted into heat, which leads to a continuous rise in the internal temperature of the pump body. This can even cause varying degrees of thermal deformation. Furthermore, the pump body operates in a high-temperature environment for a long time, which limits its output power and seriously affects the service life of the pump body. Therefore, it is necessary to cool the reciprocating pump.

[0004] Existing technologies typically employ air cooling, which involves installing a cooling fan on the reciprocating pump side to drive airflow and cool the pump body. However, this method requires a cooling fan, increases space requirements, and has poor cooling performance, thus having certain limitations. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a self-cooling reciprocating pump and its control method, which can efficiently cool the pump body through heat exchange and extend the service life of the pump body.

[0006] This invention provides a self-cooled reciprocating pump, comprising a power assembly and a main pump assembly. The power assembly and the main pump assembly are coaxially connected. The power assembly includes a housing and a core. The housing includes a receiving cavity, and the core is installed in the receiving cavity and coaxially connected to the housing. The radial wall of the receiving cavity and the radial outermost surface of the core form a medium cavity. A first pipe is provided on the pump-side of the housing. The first pipe is used to connect a medium source, which provides cooling medium to the power assembly and the pump assembly. The first pipe communicates with the medium cavity. The main pump assembly includes a heat exchange cavity and a second pipe. The heat exchange cavity communicates with the medium cavity and the second pipe. The cooling medium exchanges heat with the main pump assembly in the heat exchange cavity.

[0007] In one embodiment, the power assembly includes a pressure regulating member installed within the receiving cavity. The pressure regulating member is located between the cavity wall on the pump-side of the receiving cavity and the core, and is coaxially arranged with the housing and the core. The pressure regulating member is rotatable about the axial direction. A blade protrudes from the pump-side of the pressure regulating member. An adjustment cavity is formed between the pressure regulating member and the cavity wall on the pump-side of the receiving cavity. The adjustment cavity communicates with the first pipe and the medium cavity.

[0008] In one embodiment, a guide vane is provided on the outermost surface of the core along the radial direction, and / or the guide vane is provided on the radial cavity wall of the receiving cavity, the guide vane being received within the medium cavity, the guide vane being used to increase the contact area between the cooling medium in the medium cavity and the core.

[0009] In one embodiment, the main pump assembly includes a connecting pipe that communicates with the heat exchange chamber. The core has an interface on the pump side that communicates with the medium chamber and is connected to the connecting pipe to achieve communication between the medium chamber and the heat exchange chamber.

[0010] In one embodiment, the main pump assembly includes a main pump chamber, and a central shaft, a swashplate, and a plunger assembly disposed within the main pump chamber. One end of the central shaft is connected to the swashplate, and the other end passes through the interior of the core and is connected to the pressure regulating component. The central shaft is coaxially arranged with the core and rotates around the axial direction, causing the swashplate and the pressure regulating component to rotate around the axial direction. The end of the swashplate away from the central shaft contacts the plunger assembly. The rotation of the swashplate around the axial direction causes the plunger assembly to reciprocate along the axial direction.

[0011] In one embodiment, the core includes a functional cavity, in which a rotor and a stator are disposed. The rotor is sleeved on the central shaft and can rotate axially with the central shaft.

[0012] In one embodiment, a sealing shell is provided on the far pump side of the core. The outermost radial contour dimension of the sealing shell is larger than that of the outermost radial contour dimension of the core, and the outermost radial contour dimension of the sealing shell is larger than that of the outermost radial contour dimension of the receiving cavity. When the shell is connected to the core, the sealing shell contacts and connects with the near pump side of the shell.

[0013] In one embodiment, at least one connector is provided on the outermost radial surface of the housing near the pump side. The connector has a first connection hole, and the sealing shell has a second connection hole. The second connection hole cooperates with the first connection hole, and the connection between the housing and the core is achieved by fasteners.

[0014] In one embodiment, a connecting cylinder is provided on the pump side of the core. The connecting cylinder is connected to the core through the sealing shell. The connecting cylinder includes a pump connecting chamber, which communicates with the main pump chamber and the functional chamber. One end of the central shaft on the pump side, the swashplate, and the plunger assembly are disposed in the accommodating space formed by the pump connecting chamber and the main pump chamber.

[0015] In one embodiment, the main pump assembly includes a main pump chamber, and at least one heat-conducting column is provided in the main pump chamber. The heat-conducting column is arranged parallel to the plunger assembly in the main pump chamber. The heat exchange chamber is disposed in the heat-conducting column and is connected to the connecting pipe and the second pipe fitting.

[0016] In one embodiment, the diameter of the media chamber on the far pump side is smaller than the diameter on the near pump side.

[0017] In one embodiment, the core has a fixed diameter, and the diameter of the receiving cavity near the pump side is larger than the diameter of its far pump side, or the diameter of the core near the pump side is smaller than the diameter of its far pump side, and the receiving cavity has a fixed diameter.

[0018] In one embodiment, the diameters of the two ends of the medium cavity along the axial direction are larger than the diameter of the middle portion.

[0019] In one embodiment, the diameter of the middle portion of the core is greater than the diameter of its two ends along the axial direction, and the receiving cavity has a fixed diameter; or, the diameter of the middle portion of the receiving cavity is smaller than the diameter of its two ends along the axial direction, and the core has a fixed diameter.

[0020] This invention also proposes a control method for a self-cooled reciprocating pump, comprising the following steps:

[0021] When the power unit is started, the pressure regulating component rotates around the axis, allowing the cooling medium to enter the power unit. The cooling medium enters the regulating chamber through the first pipe, where it is pressurized from the first pressure to the second pressure.

[0022] The cooling medium enters the medium cavity from the regulating cavity, and comes into contact with the core in the medium cavity to absorb the heat of the core;

[0023] The cooling medium enters the heat exchange chamber from the medium chamber, absorbs heat from the main pump assembly in the heat exchange chamber, and is then discharged through the second pipe.

[0024] This invention also proposes a control method for a self-cooled reciprocating pump, comprising the following steps:

[0025] When the power unit is started, the pressure regulating component rotates around the axis, allowing the cooling medium to enter the power unit. The cooling medium enters the regulating chamber through the first pipe, where it is pressurized from the first pressure to the second pressure.

[0026] The cooling medium enters the medium cavity from the regulating cavity, contacts the core in the medium cavity, absorbs the heat of the core, and the cooling medium is pressurized from the second pressure to the third pressure in the medium cavity;

[0027] The cooling medium enters the heat exchange chamber from the medium chamber, absorbs heat from the main pump assembly in the heat exchange chamber, and is then discharged through the second pipe.

[0028] This invention also proposes a control method for a self-cooled reciprocating pump, comprising the following steps:

[0029] When the power unit is started, the pressure regulating component rotates around the axis, allowing the cooling medium to enter the power unit. The cooling medium enters the regulating chamber through the first pipe, where it is pressurized from the first pressure to the second pressure.

[0030] The cooling medium enters the medium cavity from the regulating cavity, contacts the core in the medium cavity, absorbs the heat of the core, and the cooling medium is pressurized from the second pressure to the third pressure in the medium cavity;

[0031] The cooling medium enters the heat exchange chamber from the medium chamber, absorbs heat from the main pump assembly in the heat exchange chamber, and is then discharged through the second pipe.

[0032] The beneficial effects of the self-cooled reciprocating pump proposed in this invention are as follows:

[0033] The power assembly includes a first pipe, a housing and a core forming a medium cavity communicating with the first pipe. The first pipe is used to introduce cooling medium into the medium cavity. The core is installed inside the housing. The cooling medium exchanges heat with and cools the core within the medium cavity to ensure the safe working environment of the power assembly and extend its service life. The main pump assembly includes a heat exchange chamber communicating with the medium cavity. The cooling medium enters the heat exchange chamber through the medium cavity and exchanges heat with the inside of the main pump assembly within the heat exchange chamber. It is then discharged through a second pipe, which can provide heat exchange and cooling for the main pump assembly, extend its service life, and occupy little space while ensuring the output power of the pump body.

[0034] The control method for the self-cooled reciprocating pump proposed in this invention can control the heat of the pump body and achieve heat exchange and cooling of the power component and main pump component through the cooling medium. The control method is simple and reliable, improves the output power of the pump body, and extends its service life. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0037] Figure 2 This is an exploded right view of the overall structure of an embodiment of the present invention;

[0038] Figure 3 This is a cross-sectional view of the overall structure of an embodiment of the present invention;

[0039] Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 This is a schematic diagram of the core structure according to an embodiment of the present invention;

[0040] Figure 6 This is a cross-sectional view of a power assembly according to another embodiment of the present invention;

[0041] Figure 7 This is a cross-sectional view of a power assembly according to another embodiment of the present invention;

[0042] Figure 8 This is a partial cross-sectional view of the overall structure according to an embodiment of the present invention;

[0043] Figure 9 This is a partial cross-sectional view of the main pump assembly according to an embodiment of the present invention.

[0044] In the picture:

[0045] 10-Power assembly; 11-Housing housing; 111-Receiving cavity; 112-Connector; 1121-First connecting hole; 12-Core; 120-Functional cavity; 121-Sealing shell; 1211-Second connecting hole; 1212-Fastener; 1213-Interface; 122-Guide vane; 123-Connecting cylinder; 1231-Pump chamber; 1232-First fixed column; 13-Pressure regulating component; 131-Blade; 14-Rotor; 15-Stator; 16-First seal; 17-Bearing; 18-Second seal;

[0046] 20-Main pump assembly; 201-Connecting pipe; 202-Main pump chamber; 203-Second fixed column; 204-Third seal; 205-Fourth seal; 206-Fifth seal; 21-Central shaft; 22-Swashplate; 23-Plunger assembly; 231-Body body; 232-Elastic element; 24-Heat-conducting column; 301-Medium chamber; 302-Adjusting chamber; 303-Heat exchange chamber; 31-First fitting; 32-Second fitting. Detailed Implementation

[0047] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0048] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0049] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or housing 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 the present invention.

[0050] The terms “first,” “second,” “third,” etc., are merely used to distinguish shells with similar properties, and do not indicate or imply relative importance or a specific order.

[0051] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0052] Appendix Figure 1 This is a schematic diagram of the overall structure of the self-cooled reciprocating pump proposed in this invention. Figure 2 This is an exploded view of the overall structure. To facilitate the description of the positional and connection relationships of the components, the end of the power assembly 10 that is closer to the main pump assembly 20 in the direction of axis L is defined as the near-pump side, and the end that is farther away from the main pump assembly 20 is defined as the far-pump side.

[0053] Combined with appendix Figure 1 and attached Figure 2The self-cooled reciprocating pump proposed in this invention includes a power assembly 10 and a main pump assembly 20. The power assembly 10 and the main pump assembly 20 are coaxially connected. The cooling medium flows from the power assembly 10 into the main pump assembly 20 and flows out from the main pump assembly 20. The cooling medium exchanges heat and cools the power assembly 10 and the main pump assembly 20, avoiding problems such as reduced service life and power output limitation caused by high temperature. This keeps the entire reciprocating pump in a safe and reliable working environment, improves the working efficiency of the reciprocating pump, and extends its service life.

[0054] The power assembly 10 includes a housing 11 and a core 12. The housing 11 includes a receiving cavity 111, which is a cavity mechanism with an opening near the pump side of the housing 11. The receiving cavity 111 is used to receive the core 12. The core 12 is installed in the receiving cavity 111 and is coaxially (axis L) connected to the housing 11. The orthographic projection of the receiving cavity 111 on axis L completely surrounds the orthographic projection of the core 12 on axis L. When the core 12 is located in the receiving cavity 111, a medium cavity 301 is formed between the radial cavity wall of the receiving cavity 111 and the radial outermost surface of the core 12. That is, a medium cavity 301 is left between the radial innermost surface of the housing 11 and the radial outermost surface of the core 12 for the cooling medium to flow through. When the cooling medium enters the medium cavity 301, it will contact the outer surface of the core 12 and exchange heat with the core 12, taking away the heat generated by the core 12 to achieve cooling of the core 12.

[0055] Combined with appendix Figure 1 and appendix Figure 3 The power assembly 10 includes a first pipe 31 disposed on the pump side of the housing 11. The first pipe 31 is connected to the receiving cavity 111. More specifically, the first pipe 31 is connected to the medium cavity 301. The first pipe 31 is used to connect to an external medium source. The cooling medium enters the medium cavity 301 through the first pipe 31.

[0056] For example, the external medium source for the first fitting 31 can be configured as a faucet. (See attached...) Figure 2As shown, the core 12 is provided with a sealing shell 121 on the pump-side. The outermost contour dimension of the sealing shell 121 in the direction orthogonal to the axis L is larger than the outermost contour dimension of the core 12 in the direction orthogonal to the axis L, and larger than the outermost contour dimension of the receiving cavity 111 in the direction orthogonal to the axis L. That is, the outermost contour dimension of the sealing shell 121 in the radial direction is larger than the outermost contour dimension of the core 12 in the radial direction, and larger than the outermost contour dimension of the receiving cavity 111 in the radial direction. More specifically, the orthogonal projection of the sealing shell 121 in the axis L direction completely surrounds the orthogonal projections of the core 12 and the receiving cavity 111. When the core 12 is connected to the housing 11, the sealing shell 121 contacts and connects with the pump-side of the housing 11. The sealing shell 121 can achieve the sealing of the medium cavity 301 to prevent the cooling medium from leaking, avoid the loss of the cooling medium, and ensure the cooling efficiency.

[0057] In one example, the central axis of the sealing shell 121 coincides with that of the core 12, that is, the core 12 and the sealing shell 121 are coaxially arranged. This arrangement can reduce the processing difficulty and ensure the overall aesthetics and design.

[0058] In another example, the central axis of the sealing shell 121 and the core 12 do not coincide, that is, the sealing shell 121 and the core 12 are eccentrically set. This setting can also play the role of sealing the medium cavity 301 and connecting with the shell 11.

[0059] In one example, the core 12 is integrally formed with the sealing shell 121.

[0060] In another example, the core 12 and the sealing shell 121 are connected by welding.

[0061] Appendix Figure 3 This is a cross-sectional view of the overall structure of the self-cooled reciprocating pump proposed in this invention. In one possible example, it is combined with the attached... Figure 2 and attached Figure 3 The connection between the housing 11 and the core 12 is as follows: the housing 11 has at least one connector 112 protruding on the outermost surface of the radial direction near the pump side. The connector 112 has a first connection hole 1121, and the sealing shell 121 has a second connection hole 1211. The second connection hole 1211 is configured to cooperate with the first connection hole 1121. The first connection hole 1121 and the second connection hole 1211 are connected by fasteners 1212, thereby realizing the quick connection between the housing 11 and the core 12.

[0062] For example, the first connecting hole 1121 and the second connecting hole 1211 are set as screw holes, and the fastener 1212 is set as a bolt. The screw connection method is simple to process, easy to disassemble and assemble, and convenient for maintenance and repair.

[0063] In one possible example, the first housing 11 is configured as cylindrical.

[0064] In one possible example, the second housing 12 is configured as cylindrical.

[0065] In one possible example, the first cavity 111 is configured as a cylindrical cavity.

[0066] As attached Figure 2 As shown, the power assembly 10 includes a pressure regulating component 13. The pressure regulating component 13 is installed between the cavity wall on the far pump side of the receiving cavity 111 and the core 12, and is coaxially arranged with the housing 11 and the core 12. The pressure regulating component 13 can rotate around the axis L. The far pump side of the pressure regulating component 13 is provided with a blade 131. Due to the protrusion of the blade 131, when the pressure regulating component 13 is installed in the receiving cavity 111, an adjustment cavity 302 is formed between the pressure regulating component 13 and the cavity wall on the far pump side of the receiving cavity 111. The adjustment cavity 302 is connected to the first pipe 31 and the medium cavity 301.

[0067] The rotation of the pressure regulating component 13 around the axis L provides power to the cooling medium from the first pipe 31. The cooling medium can enter the housing 11 through the first pipe 31, or more specifically, it enters the regulating cavity 302 through the first pipe 31. During the rotation of the pressure regulating component 13, the blades 131 agitate the cooling medium, causing it to be pressurized under centrifugal force. The high-pressure cooling medium enters the medium cavity 301 from the regulating cavity 302. In the medium cavity 301, the cooling medium comes into contact with the core 12 and exchanges heat with it, thereby cooling the core 12. In one example, the diameter of the pressure regulating component 13 is smaller than the diameter of the receiving cavity 111, and the diameter of the pressure regulating component 13 can be greater than, equal to, or smaller than the diameter of the core 12.

[0068] In existing reciprocating pumps, the reciprocating motion of the plunger assembly 23 creates a vacuum chamber inside the pump. The pressure difference between the vacuum chamber and the external atmospheric pressure is used to pump the medium into the vacuum chamber. During this process, the medium loses energy, which affects the pumping pressure. In this invention, the pressure regulating component 13 pressurizes the cooling medium. While using the cooling medium for heat dissipation and cooling, it can compensate for the energy loss of the cooling medium and increase the pumping pressure of the cooling medium.

[0069] In some existing reciprocating pumps, a booster pump is usually installed outside the reciprocating pump to pressurize the medium and increase the pumping pressure of the medium. However, this method increases the space occupied by the entire reciprocating pump system, and additional pipelines are required between the booster pump and the reciprocating pump to transfer the medium, which increases the cost and has certain limitations. By installing a pressure regulating component 13 inside the reciprocating pump, the structure and volume of the reciprocating pump are simplified, the problem of increased space occupation is avoided, and the pumping pressure of the cooling medium can be increased, which has good economic efficiency and practicality.

[0070] In one possible example, combined with appendix Figure 2 and attached Figure 3 The outermost surface of the core 12 in the direction orthogonal to the axis L is provided with a guide plate 122, that is, the outermost surface of the core 12 in the radial direction is provided with a guide plate 122. The guide plate 122 is accommodated in the medium cavity 301. The guide plate 122 is used to increase the contact area between the cooling medium in the medium cavity 301 and the core 12, and further improve the heat dissipation efficiency.

[0071] For example, the guide vane 122 may also be disposed on the radial cavity wall of the receiving cavity 111, or simultaneously disposed on the outermost radial surface of the core 12 and the radial cavity wall of the receiving cavity 111.

[0072] For example, see attached Figure 5 As shown, the guide vane 122 is spiral-shaped, which can guide the cooling medium. The cooling medium can flow around the medium cavity 301 along the spiral guide vane 122 to improve the heat dissipation uniformity of the core 12.

[0073] For example, the guide vane 122 extends along the direction of axis L, and a guide gap is left between the two ends of the guide vane 122 in the axial direction and the two ends of the core 12 and / or the receiving cavity 111 in the axial direction. The setting of this gap facilitates the coolant medium to enter the medium cavity 301 from the regulating cavity 302 and from the medium cavity 301 into the main pump assembly 20. The aforementioned extension along the direction of axis L can be parallel to axis L or at a certain angle to axis L, so as to increase the contact area between the coolant medium and the core 12 and ensure heat dissipation efficiency.

[0074] In one example of this embodiment, as shown in the appendix Figure 6 As shown, attached Figure 6 (A) is a cross-sectional view of the power assembly 10, with attached... Figure 6 (B) To more intuitively illustrate the simplified diagram of the media cavity 301, the core 12 is arranged with a variable diameter along axis L. The diameter of the core 12 near the pump is smaller than the diameter of its far-pump side, while the diameter of the receiving cavity 111 remains constant, as shown in the attached diagram. Figure 6 As shown in (B), the diameter of the medium cavity 301 is smaller on the far pump side and larger on the near pump side. That is, on the far pump side, the medium cavity 301 includes a constricted section, and on the near pump side, the medium cavity 301 includes a flared section. With this configuration, when the cooling medium enters the medium cavity 301 from the regulating cavity 302 and flows from the far pump side to the near pump side of the medium cavity 301, it can be pressurized when flowing from the constricted section to the flared section. It can also cooperate with the pressure regulating component 13 to achieve secondary pressurization of the cooling medium.

[0075] For example, the diameter of the core 12 varies linearly along the axis L, but it can also vary non-linearly.

[0076] In another example of this embodiment, the diameter of the core 12 is fixed, and the diameter of the receiving cavity 111 near the pump is larger than that of the far pump side, so that the diameter of the medium cavity 301 is smaller on the far pump side and larger on the near pump side. That is, on the far pump side, the medium cavity 301 includes a constricted section, and on the near pump side, the medium cavity 301 includes a flared section. With this configuration, when the cooling medium enters the medium cavity 301 from the regulating cavity 302 and flows from the far pump side to the near pump side of the medium cavity 301, it can be pressurized when flowing from the constricted section to the flared section. It can also cooperate with the pressure regulating component 13 to achieve secondary pressurization of the cooling medium.

[0077] For example, the diameter of the receiving cavity 111 varies linearly along the axis L.

[0078] In another example of this embodiment, both the core 12 and the receiving cavity 111 are configured to have variable diameters, so that the diameter of the medium cavity 301 is smaller on the far pump side and larger on the near pump side.

[0079] In another example of this embodiment, as shown in the appendix Figure 7 As shown, attached Figure 7 (A) is a cross-sectional view of the power assembly 10, with attached... Figure 7 (B) To more intuitively illustrate the simplified diagram of the medium cavity 301, the core 12 is arranged with a variable diameter along the axis L. The diameter of the middle part of the core 12 is larger than the diameter of its two ends along the axial direction. The diameter of the receiving cavity 111 is fixed, so that the diameter of the two ends of the medium cavity 301 near the pump and far from the pump is larger than the diameter of the middle part. The medium cavity 301 includes two flared sections and a constricted section connecting the two flared sections. With this arrangement, when the cooling medium enters the medium cavity 301 from the regulating cavity 302, it can be pressurized, and it can cooperate with the pressure regulating component 13 to achieve secondary pressurization of the cooling medium.

[0080] In another example of this embodiment, the diameter of the core 12 is fixed, the diameter of the middle part of the receiving cavity 111 is smaller than the diameter of its two ends along the axial direction, and the diameter of the two ends of the medium cavity 301 near the pump and far from the pump is larger than the diameter of its middle part. The medium cavity 301 includes two flared sections and a constricted section connecting the two flared sections. With this configuration, when the cooling medium enters the medium cavity 301 from the regulating cavity 302, it can be pressurized, and it can cooperate with the pressure regulating component 13 to achieve secondary pressurization of the cooling medium.

[0081] In another example of this embodiment, both the core 12 and the receiving cavity 111 are configured with variable diameters.

[0082] By using the above structure to perform secondary pressurization of the cooling medium, the pump output pressure of the cooling medium can be further increased without increasing the overall volume of the reciprocating pump, which has good economic efficiency and practicality.

[0083] As attached Figure 2 As shown, the main pump assembly 20 includes a connecting pipe 201 and a heat exchange chamber 303. The connecting pipe 201 is connected to the heat exchange chamber 303. The core 12 has an interface 1213 near the pump side, which is connected to the medium chamber 301. The connecting pipe 201 is connected to the interface 1213 to realize the connection between the medium chamber 301 and the heat exchange chamber 303. The cooling medium in the medium chamber 301 enters the heat exchange chamber 303 through the interface 1213 and the connecting pipe 201, and then flows out of the heat exchange chamber 303.

[0084] The main pump assembly 20 includes a second pipe 32, which is connected to the heat exchange chamber 303. The cooling medium from the connecting pipe 201 flows through the heat exchange chamber 303 to the second pipe 32 and is discharged from the main pump assembly 20 through the second pipe 32.

[0085] As attached Figure 2 As shown, the main pump assembly 20 includes a main pump chamber 202, and a central shaft 21, a swashplate 22, and a plunger assembly 23 disposed within the main pump chamber 202. One end of the central shaft 21 is connected to the swashplate 22. The main body of the central shaft 21 is installed inside the core 12, and the end of the central shaft 21 away from the swashplate 22 extends out of the core 12 and is connected to the pressure regulating component 13. The central shaft 21 is coaxially arranged with the housing 11 and the core 12. The swashplate 22 is inclined. The end face of the swashplate 22 away from the central shaft 21 in the axial direction contacts the plunger assembly 23. The central shaft 21 can rotate around the axis L, driving the swashplate 22 and the pressure regulating component 13 to rotate around the axis L. During the rotation of the swashplate 22, due to its inclined arrangement, the position of its contact surface with the plunger assembly 23 in the axial direction will change in height, thereby realizing the reciprocating motion of the plunger assembly 23 along the axis L.

[0086] For example, gear oil is provided in the main pump chamber 202.

[0087] As attached Figure 2 As shown, the plunger assembly 23 includes a main body 231 and an elastic element 232 sleeved on the outside of the main body 231. The main body 231 is used to contact the swashplate 22. When the swashplate 22 rotates to a higher position where its contact surface with the main body 231 is, causing the plunger assembly 23 to move axially, the elastic element 232 is compressed and undergoes elastic deformation. When the swashplate 22 continues to rotate to a lower position where its contact surface with the plunger assembly 23 is, the elastic element 232 recovers its deformation, and the restoring force resets the main body 231, thus realizing the reciprocating motion of the plunger assembly 23 along the axial direction.

[0088] For example, the main body 231 is set as a hollow column.

[0089] As attached Figure 3As shown, the core 12 includes a functional cavity 120, which is a hollow structure with openings at both ends along the axis L. That is, the functional cavity 120 includes a first opening and a second opening (not shown in the figure) along the axis L. The first opening is located on the pump side of the core 12, and the second opening is located on the pump side of the core 12. One end of the central shaft 21 passes through the first opening and is connected to the swashplate 22, and the other end passes through the second opening and is connected to the pressure regulating component 13.

[0090] As attached Figure 3 As shown, the functional cavity 120 is provided with a rotor 14 and a stator 15. The rotor 14 is sleeved on the central shaft 21 and is coaxial with the central shaft 21. The stator 15 is sleeved on the rotor 14 and is coaxial with the rotor 14. When the central shaft 21 rotates around the shaft L, it drives the rotor 14 to rotate around the axial direction.

[0091] Combined with appendix Figure 3 and attached Figure 4 The central shaft 21 is provided with a first seal 16 near the first opening and the second opening. The first seal 16 is respectively set at the connection between the central shaft 21 and the first opening and the connection between the central shaft 21 and the second opening. The first seal 16 can play a good sealing role, prevent the cooling medium from seeping into the functional cavity 120, reduce the loss of cooling medium, and at the same time ensure the function of the central shaft 21, rotor 14 and stator 15.

[0092] Combined with appendix Figure 3 and attached Figure 4 A bearing 17 is provided between the central shaft 21 and the core 12 to realize the relative rotation between the core 12 and the central shaft 21. For example, there are two bearings 17, which are respectively located at both ends of the central shaft 21, or more specifically, at the connection between the central shaft 21 and the first opening, and at the connection between the central shaft 21 and the second opening.

[0093] Combined with appendix Figure 3 and attached Figure 4 A second seal 18 is provided between the housing 11 and the core 12. The second seal 18 is located on the pump side of the core 12 and the housing 11, or more specifically, between the sealing shell 121 and the housing 11. The second seal 18 can prevent the leakage of cooling medium, reduce the loss of cooling medium, and ensure the cooling effect.

[0094] Combined with appendix Figure 2 and attached Figure 3A connecting cylinder 123 is provided on the pump side of the core 12. The connecting cylinder 123 is connected to the core 12 through a sealing shell 121. The connecting cylinder 123 includes a pump connecting chamber 1231, which is connected to the main pump chamber 202. The pump connecting chamber 1231 is also connected to the functional chamber 120 through a first opening. One end of the central shaft 21 on the pump side extends out of the functional chamber 120 through the first opening. The one end of the central shaft 21 on the pump side, the swashplate 22, and the plunger assembly 23 are disposed in the accommodating space formed by the pump connecting chamber 1231 and the main pump chamber 202.

[0095] For example, the connecting cylinder 123 and the sealing shell 121 are integrally formed.

[0096] For example, in conjunction with the appendix Figure 2 and attached Figure 8 The outermost surface of the connecting cylinder 123 along the radial direction is provided with a first fixing post 1232, and a first fixing hole is provided on the first fixing post 1232. The main pump assembly 20 includes a second fixing post 203, and a second fixing hole is provided on the second fixing post 203. The connection between the connecting cylinder 123 and the main pump assembly 20 is realized through the first fixing hole and the second fixing hole.

[0097] For example, see attached Figure 3 As shown, a third seal 204 is provided between the connecting cylinder 123 and the main pump assembly 20. The setting of the third seal 204 can ensure that the connection between the connecting cylinder 123 and the main pump assembly 20 is tight.

[0098] For example, see attached Figure 3 As shown, the main pump assembly 20 also includes a fourth seal 205, which is sleeved on the body 231 of the plunger assembly 23. The fourth seal 205 can seal and lock oil to ensure the lubrication of the plunger assembly 23.

[0099] For example, see attached Figure 3 As shown, the main pump assembly 20 also includes a fifth seal 206, which is sleeved on the body 231 of the plunger assembly 23 and can play a sealing role.

[0100] Combined with appendix Figure 3 and attached Figure 8 The main pump assembly 20 includes at least one heat-conducting column 24, the axial direction of which is parallel to the shaft L. The heat-conducting column 24 is arranged in the main pump chamber 202, and the heat exchange chamber 303 is disposed in the heat-conducting column 24. The heat-conducting column 24 is connected to the connecting pipe 201 and the second pipe fitting 32. Since the heat-conducting column 24 is arranged in the main pump chamber 202, the main pump chamber 202 is usually filled with hot oil. When the cooling medium enters the heat exchange chamber 303 of the heat-conducting column 24 through the connecting pipe 201, heat exchange occurs between the heat-conducting column 24 and the main pump chamber 202 to reduce the temperature in the main pump chamber 202.

[0101] For example, the heat-conducting column 24 is coaxially arranged with the central shaft 21 to avoid occupying the installation space of the plunger assembly 23.

[0102] For example, a one-way valve is provided inside the connecting pipe 201 to prevent the cooling medium from flowing back.

[0103] For example, the second fitting 32 is provided with a one-way valve to prevent the cooling medium from flowing back.

[0104] Based on the above-mentioned self-cooled reciprocating pump, the present invention also proposes a control method for the self-cooled reciprocating pump, which specifically includes the following steps:

[0105] When the power assembly 10 is powered on, the rotor 14 rotates, driving the central shaft 21 to rotate around the axis. The pressure regulating component 13 rotates around the axis and provides power to the cooling medium. The cooling medium enters the regulating chamber 302 through the first pipe 31. The cooling medium that just enters the regulating chamber 302 has a first pressure. Through the rotation of the blades 131 around the axis, centrifugal force is provided to the cooling medium, causing the cooling medium to increase from the first pressure to the second pressure.

[0106] The cooling medium enters the medium cavity 301 from the regulating cavity 302, contacts the outermost surface of the core 12 in the radial direction and exchanges heat, absorbs the heat of the core 12, and cools the core 12.

[0107] The cooling medium enters the heat exchange chamber 303 from the medium chamber 301, and exchanges heat with the inside of the main pump assembly 20 in the heat exchange chamber 303, absorbing the heat inside the main pump assembly 20 to achieve cooling of the main pump assembly 20, and then is discharged from the main pump assembly 20 through the second pipe 32.

[0108] The control method for a self-cooled reciprocating pump proposed in this invention further includes the following steps:

[0109] When the power assembly 10 is powered on, the rotor 14 rotates, driving the central shaft 21 to rotate around the axis. The pressure regulating component 13 rotates around the axis and provides power to the cooling medium. The cooling medium enters the regulating chamber 302 through the first pipe 31. The cooling medium that just enters the regulating chamber 302 has a first pressure. Through the rotation of the blades 131 around the axis, centrifugal force is provided to the cooling medium, causing the cooling medium to increase from the first pressure to the second pressure.

[0110] The cooling medium enters the medium cavity 301 through the regulating cavity 302, contacts the outermost radial surface of the core 12 and exchanges heat, absorbs the heat of the core 12, and cools the core 12. In the medium cavity 301, since the medium cavity 301 is set with a variable diameter, the cooling medium in the medium cavity 301 is pressurized, and the pressure is increased from the second pressure to the third pressure in the medium cavity 301.

[0111] The cooling medium enters the heat exchange chamber 303 from the medium chamber 301, and exchanges heat with the inside of the main pump assembly 20 in the heat exchange chamber 303, absorbing the heat inside the main pump assembly 20 to achieve cooling of the main pump assembly 20, and then is discharged from the main pump assembly 20 through the second pipe 32.

[0112] In summary, the self-cooled reciprocating pump proposed in this invention includes a power assembly 10 comprising a first pipe 31, a housing 11 and a core 12 forming a medium cavity 301 communicating with the first pipe, the first pipe 31 for introducing cooling medium into the medium cavity 301, the core 12 being installed inside the housing 11, and the cooling medium performing heat exchange and cooling on the core 12 within the medium cavity 301 to ensure the safe working environment of the power assembly 10 and extend its service life; the main pump assembly 20 includes a heat exchange cavity 303 communicating with the medium cavity 301, the cooling medium entering the heat exchange cavity 303 through the medium cavity 301, exchanging heat with the inside of the main pump assembly 20 within the heat exchange cavity 303, and then discharging through the second pipe 32, thus providing heat exchange and cooling for the main pump assembly 20, extending its service life, and ensuring the pump's output power.

[0113] The self-cooled reciprocating pump control method proposed in this invention can control the heat of the pump body and achieve heat exchange and cooling of the power component 10 and the main pump component 20 through the cooling medium. The control method is simple and reliable, improves the output power of the pump body, and extends its service life.

[0114] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0115] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A self-cooled reciprocating pump characterized by: The power assembly (10) and the main pump assembly (20) are coaxially connected, the power assembly (10) comprises a shell (11) and a core body (12), the shell (11) comprises a containing cavity (111), the core body (12) is installed in the containing cavity (111) and coaxially connected with the shell (11), the containing cavity (111) and the radially outermost surface of the core body (12) cooperate to form a medium cavity (301), the far pump side of the shell (11) is provided with a first pipe fitting (31), the first pipe fitting (31) is used for connecting a medium source, the medium source is used for providing cooling medium into the power assembly (10) and the main pump assembly (20), the first pipe fitting (31) is communicated with the medium cavity (301), the radially outermost surface of the core body (12) is provided with a guide vane (122), and / or the containing cavity (111) is provided with the guide vane (122) on the radially cavity wall, the guide vane (122) is contained in the medium cavity (301), the guide vane (122) is used for increasing the contact area of the cooling medium in the medium cavity (301) and the core body (12), the main pump assembly (20) comprises a connecting pipe (201), a heat exchange cavity (303) and a second pipe fitting (32), the connecting pipe (201) is communicated with the heat exchange cavity (303), the heat exchange cavity (303) is communicated with the medium cavity (301) and the second pipe fitting (32), the near pump side of the core body (12) is provided with an interface (1213), the interface (1213) is communicated with the medium cavity (301), the interface (1213) is connected with the connecting pipe (201), so that the medium cavity (301) and the heat exchange cavity (303) are communicated, and the cooling medium exchanges heat with the main pump assembly (20) in the heat exchange cavity (303).

2. The self-cooling reciprocating pump of claim 1, wherein: The power assembly (10) comprises a pressure regulating piece (13), the pressure regulating piece (13) is installed in the containing cavity (111), the pressure regulating piece (13) is located between the cavity wall of the far pump side of the containing cavity (111) and the core body (12), and the pressure regulating piece (13) is coaxially arranged with the shell (11) and the core body (12), the pressure regulating piece (13) can rotate around the axis, the far pump side of the pressure regulating piece (13) is provided with a blade (131), the pressure regulating piece (13) and the cavity wall of the far pump side of the containing cavity (111) form an adjusting cavity (302), the adjusting cavity (302) is communicated with the first pipe fitting (31) and the medium cavity (301).

3. The self-cooling reciprocating pump of claim 2, wherein: The main pump assembly (20) comprises a main pump cavity (202), a central shaft (21), a swash plate (22) and a plunger assembly (23) arranged in the main pump cavity (202), one end of the central shaft (21) is connected with the swash plate (22), the other end penetrates the inside of the core (12) and is connected with the pressure regulating part (13), the central shaft (21) is coaxially arranged with the core (12), and the central shaft (21) rotates around the axial direction to drive the swash plate (22) and the pressure regulating part (13) to rotate around the axial direction, one end of the swash plate (22) away from the central shaft (21) is in contact with the plunger assembly (23), and the swash plate (22) rotates around the axial direction to drive the plunger assembly (23) to reciprocate along the axial direction.

4. The self-cooling reciprocating pump of claim 3, wherein: The core (12) comprises a functional cavity (120), and a rotor (14) and a stator (15) are arranged in the functional cavity (120), the rotor (14) is sleeved on the central shaft (21) and can rotate around the axial direction with the central shaft (21).

5. The self-cooling reciprocating pump of claim 4, wherein: The core (12) is provided with a sealing shell (121) on the side away from the pump, the outermost radial dimension of the sealing shell (121) is greater than the outermost radial dimension of the core (12), and the outermost radial dimension of the sealing shell (121) is greater than the outermost radial dimension of the accommodating cavity (111), and when the shell (11) is connected with the core (12), the sealing shell (121) is in contact with and connected with the side close to the pump of the shell (11).

6. The self-cooling reciprocating pump of claim 5, wherein: The side close to the pump of the shell (11) is provided with at least one connecting piece (112) on the outermost radial surface, a first connecting hole (1121) is formed in the connecting piece (112), a second connecting hole (1211) is formed in the sealing shell (121), the second connecting hole (1211) is matched with the first connecting hole (1121), and the connection between the shell (11) and the core (12) is realized by a fastener (1212).

7. The self-cooling reciprocating pump of claim 5, wherein: The side close to the pump of the core (12) is provided with a connecting cylinder (123), the connecting cylinder (123) is connected with the core (12) through the sealing shell (121), the connecting cylinder (123) comprises a connecting pump cavity (1231), the connecting pump cavity (1231) is in communication with the main pump cavity (202) and the functional cavity (120), and one end of the central shaft (21) close to the pump, the swash plate (22) and the plunger assembly (23) are arranged in the accommodating space formed by the connecting pump cavity (1231) and the main pump cavity (202).

8. The self-cooling reciprocating pump of claim 1, wherein: The main pump assembly (20) comprises a main pump cavity (202), at least one heat conduction column (24) is arranged in the main pump cavity (202), the heat conduction column (24) is arranged in parallel with the plunger assembly (23) in the main pump cavity (202), the heat exchange cavity (303) is arranged in the heat conduction column (24), and the heat exchange cavity (303) is in communication with the connecting pipe (201) and the second pipe (32).

9. The self-cooling reciprocating pump according to claim 1 or 2, characterized in that: The diameter of the medium cavity (301) at the far pump side is smaller than that at the near pump side.

10. The self-cooling reciprocating pump of claim 9, wherein: The diameter of the core (12) is fixed, the diameter of the accommodating cavity (111) at the near pump side is larger than that at the far pump side, or the diameter of the core (12) at the near pump side is smaller than that at the far pump side, and the diameter of the accommodating cavity (111) is fixed.

11. The self-cooling reciprocating pump according to claim 1 or 2, characterized in that: The diameter of the medium cavity (301) at the two axial ends is larger than that at the middle part.

12. The self-cooling reciprocating pump of claim 11, wherein: The diameter of the core (12) at the middle part is larger than that at the two axial ends, and the diameter of the accommodating cavity (111) is fixed, or the diameter of the accommodating cavity (111) at the middle part is smaller than that at the two axial ends, and the diameter of the core (12) is fixed.

13. A control method for a self-cooling reciprocating pump according to claim 2, characterized in that: The method comprises the following steps: The power assembly (10) is started, the pressure regulating member (13) rotates around the axial direction, and the cooling medium is provided into the power assembly (10). The cooling medium enters the adjusting cavity (302) through the first pipe (31) and is pressurized from the first pressure to the second pressure in the adjusting cavity (302). The cooling medium enters the medium cavity (301) from the adjusting cavity (302), contacts the core (12) in the medium cavity (301), and absorbs the heat of the core (12). The cooling medium enters the heat exchange cavity (303) from the medium cavity (301), absorbs the heat inside the main pump assembly (20) in the heat exchange cavity (303), and is discharged through the second pipe (32).

14. A control method for a self-cooling reciprocating pump as claimed in claim 9, characterized in that: The method comprises the following steps: The power assembly (10) is started, the pressure regulating member (13) rotates around the axial direction, and the cooling medium is provided into the power assembly (10). The cooling medium enters the adjusting cavity (302) through the first pipe (31) and is pressurized from the first pressure to the second pressure in the adjusting cavity (302). The cooling medium enters the medium cavity (301) from the adjusting cavity (302), contacts the core (12) in the medium cavity (301), and absorbs the heat of the core (12). The cooling medium is pressurized from the second pressure to the third pressure in the medium cavity (301). The cooling medium enters the heat exchange cavity (303) from the medium cavity (301), absorbs the heat inside the main pump assembly (20) in the heat exchange cavity (303), and is discharged through the second pipe (32).

15. A control method for a self-cooling reciprocating pump as claimed in claim 11, characterized in that: The method comprises the following steps: The power assembly (10) is started, the pressure regulating member (13) rotates around the axial direction, and the cooling medium is provided into the power assembly (10). The cooling medium enters the adjusting cavity (302) through the first pipe (31) and is pressurized from the first pressure to the second pressure in the adjusting cavity (302). The cooling medium enters the medium cavity (301) from the adjusting cavity (302), contacts the core (12) in the medium cavity (301), and absorbs the heat of the core (12). The cooling medium is pressurized from the second pressure to the third pressure in the medium cavity (301). The cooling medium enters the heat exchange cavity (303) from the medium cavity (301), absorbs the heat inside the main pump assembly (20) in the heat exchange cavity (303), and is discharged through the second pipe (32).

Images