Plunger pump cooling device and plunger pump

Abstract

The invention discloses a plunger pump cooling device and a plunger pump, and belongs to the technical field of plunger pumps. The plunger pump cooling device comprises a pump body, a valve body and a plunger assembly; the valve body and the pump body are enclosed to form a liquid inlet cavity and a liquid outlet cavity; the stuffing box assembly is connected with the pump body, the stuffing box assembly is provided with a pump cavity, the plunger body penetrates through the pump cavity and is connected with the stuffing box assembly, and a cooling cavity is formed between the plunger body and the stuffing box assembly; the first cooling flow channel communicates with the liquid inlet cavity and the cooling cavity, the second cooling flow channel communicates with the first liquid inlet flow channel and the cooling cavity, the second liquid inlet flow channel communicates with the liquid inlet cavity and the pump cavity, and the liquid discharging flow channel communicates with the pump cavity and the liquid discharging cavity. The flow channels are formed in the stuffing box assembly and the valve body to form a complete one-way flowing plunger pump self-cooling path, continuous cooling of the plunger body is achieved while the plunger pump outputs and conveys a medium, and the medium after cooling the plunger body can still be output after being pressurized through the plunger pump after being discharged through the liquid discharging flow channel and the liquid discharging cavity. And the waste of the conveying medium is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pump, in particular to a plunger pump cooling device and a plunger pump. BACKGROUND

[0002] The plunger body in the plunger pump is usually cooled by external circulating coolant or one-way self-cooling flow channel design. However, if external circulating cooling is used in a methanol plunger pump, methanol fuel leakage may contaminate the coolant due to seal failure, which violates the principle of intrinsic safety. Although the one-way self-cooling flow channel can avoid external pollution, it cannot form a cooling medium circulation, resulting in ineffective heat dissipation. In addition, if a backflow flow channel for the self-cooling medium in the cooling cavity is added in the pump head assembly, a large number of double-layer structures, process holes and special plugs need to be added in the pump head, which increases the design and processing difficulty of the flow channel and increases the risk of methanol leakage. SUMMARY

[0003] The plunger pump cooling device and the plunger pump provided by the embodiments of the present application can realize self-cooling of the plunger pump to at least partially solve the above technical problems.

[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a plunger pump cooling device is provided, comprising: a pump body, the pump body having a liquid inlet cavity and a liquid outlet cavity; a valve body connected with the pump body and surrounding the inner wall of the pump body to form the liquid inlet cavity and the liquid outlet cavity, respectively, the valve body having a first liquid inlet flow channel, a second liquid inlet flow channel and a liquid outlet flow channel; a plunger assembly including a packing gland assembly and a plunger body, the packing gland assembly being connected with the pump body, the packing gland assembly having a pump cavity, the plunger body being arranged in the pump cavity and connected with the packing gland assembly, the plunger body and the packing gland assembly having a cooling cavity therebetween; the packing gland assembly having a first cooling flow channel and a second cooling flow channel, the first cooling flow channel being in communication with the liquid inlet cavity and the cooling cavity, the second cooling flow channel being in communication with the first liquid inlet flow channel and the cooling cavity, the second liquid inlet flow channel being in communication with the liquid inlet cavity and the pump cavity, and the liquid outlet flow channel being in communication with the pump cavity and the liquid outlet cavity.

[0005] Optionally, the plunger pump includes a liquid inlet valve, a liquid outlet valve and a pre-tightening assembly, the liquid inlet valve and the pre-tightening assembly being located in the pump cavity, and the pre-tightening assembly being arranged around the plunger body; the liquid inlet valve is connected with the pre-tightening assembly and the valve body along the axial direction of the plunger body, respectively, and the liquid inlet valve is used to control the opening and closing of the first liquid inlet flow channel and the second liquid inlet flow channel. The liquid outlet valve is located in the liquid outlet cavity, and the liquid outlet valve is connected with the valve body and the pump body along the axial direction of the plunger body, respectively, and the liquid outlet valve is used to control the opening and closing of the liquid outlet flow channel.

[0006] Optionally, the packing gland assembly comprises a packing gland body, a packing gland block and a packing seal assembly, the packing gland body has a pump cavity, one end of the packing gland body away from the plunger body is connected with the pump body and the valve body, at least part of the packing gland block is arranged in the pump cavity and connected with the packing gland body, the packing seal assembly is arranged in the pump cavity and connected with the packing gland block and the pre-tightening assembly along the axial direction of the plunger body.

[0007] Optionally, the packing gland body has a groove, an opening of the groove is arranged towards the packing gland block, the groove is communicated with the first cooling flow channel and the second cooling flow channel; the packing gland block has a through hole, one end of the through hole is communicated with the groove, and the other end of the through hole is arranged opposite to the plunger body, and the cooling cavity comprises the through hole and the groove.

[0008] Optionally, the packing gland block has a sealing groove, an opening of the sealing groove is arranged towards the plunger body. The packing gland assembly comprises a sealing member, the sealing member is arranged in the sealing groove and forms a dynamic seal with the plunger body.

[0009] Optionally, the packing seal assembly comprises a gasket and a water seal, the gasket is connected with the packing gland block and the water seal along the axial direction of the plunger body, and the water seal is connected with the pre-tightening assembly on the side away from the gasket.

[0010] Optionally, the pre-tightening assembly comprises a spring seat, a pre-tightening spring and a pressing sleeve, the spring seat is connected with the pre-tightening spring and the packing seal assembly along the axial direction of the plunger body, and the pressing sleeve is connected with the pre-tightening spring and the valve body along the axial direction of the plunger body.

[0011] Optionally, one of the valve body and the pump body is provided with a protrusion, and the other is provided with a recess, the protrusion is embedded in the recess to connect the pump body and the valve body.

[0012] Optionally, the first liquid inlet flow channel comprises a first branch and a second branch communicated with each other, the first branch is communicated with the pump cavity, and the second branch is communicated with the second cooling flow channel, the first branch is arranged along the axial direction of the plunger body intersecting each other, and the second branch is arranged along the radial direction of the plunger body.

[0013] Optionally, the included angle between the second liquid inlet flow channel and the axial direction of the plunger body is the same as the included angle between the first branch and the axial direction of the plunger body.

[0014] Optionally, the valve body has a plurality of first liquid inlet flow channels, and the plurality of first liquid inlet flow channels are uniformly arranged along the outer periphery of the axial direction of the plunger body.

[0015] Optionally, the valve body has a plurality of second liquid inlet flow channels, and the plurality of second liquid inlet flow channels are uniformly arranged along the outer periphery of the axial direction of the plunger body.

[0016] Optionally, the cross-sectional area of the first liquid inlet flow channel is greater than the cross-sectional area of the second liquid inlet flow channel.

[0017] Optionally, the packing gland assembly has a plurality of first cooling flow channels, which are uniformly arranged along the outer periphery of the axial direction of the plunger body.

[0018] Optionally, the packing gland assembly has a plurality of second cooling flow channels, which are uniformly arranged along the outer periphery of the axial direction of the plunger body.

[0019] According to a second aspect of the present application, a plunger pump is provided, which comprises the plunger pump cooling device described above.

[0020] The plunger pump cooling device of the embodiments of the present application comprises a pump body, a valve body and a plunger assembly; the pump body has a liquid inlet cavity and a liquid outlet cavity; the valve body is connected with the pump body and cooperates with the inner wall of the pump body to form the liquid inlet cavity and the liquid outlet cavity, respectively; the valve body has a first liquid inlet flow channel, a second liquid inlet flow channel and a liquid outlet flow channel; the plunger assembly comprises a packing gland assembly and a plunger body; the packing gland assembly is connected with the pump body; the packing gland assembly has a pump cavity; the plunger body is arranged in the pump cavity and connected with the packing gland assembly; the plunger body and the packing gland assembly have a cooling cavity therebetween; the packing gland assembly has a first cooling flow channel and a second cooling flow channel; the first cooling flow channel is connected with the liquid inlet cavity and the cooling cavity; the second cooling flow channel is connected with the first liquid inlet flow channel and the cooling cavity; the second liquid inlet flow channel is connected with the liquid inlet cavity and the pump cavity; and the liquid outlet flow channel is connected with the pump cavity and the liquid outlet cavity. In this way, the delivery medium in the plunger pump can be used as the cooling medium, without the need to introduce external cooling liquid, thereby avoiding the safety hazard of mixing and leakage of different media. By arranging the liquid inlet flow channel, the cooling flow channel and the liquid outlet flow channel on the packing gland assembly and the valve body, a complete and one-way flow plunger pump self-cooling path is formed; the plunger body is continuously cooled while the plunger pump is outputting the delivery medium; the medium cooled after the plunger body is output through the liquid outlet flow channel and the liquid outlet cavity, and can still be output after being pressurized by the plunger pump, thereby avoiding the waste of the delivery medium.

[0021] The plunger pump of the embodiments of the present application comprises the plunger pump cooling device described above, and therefore can have all the technical features and beneficial effects of the plunger pump cooling device described above, which will not be described herein again.

[0022] Other features and advantages of the present application will be described in detail in the following specific embodiments section. BRIEF DESCRIPTION OF DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0023] For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in connection with the accompanying drawings in which like numbers represent like parts.

[0024] Figure 1 is a schematic view of the overall structure of the plunger pump provided in the exemplary embodiment of the present application; Figure 2 is an A-A sectional view of Figure 1 ; Figure 3 is a B-B sectional view of Figure 2 ; Figure 4 is a C-C sectional view of Figure 2 ; Figure 5 is a sectional view of the packing gland provided in the exemplary embodiment of the present application; Figure 6 is a sectional view of the pump body provided in the exemplary embodiment of the present application; Figure 7 is a D-directional view of the pump head shown in Figure 6 ; Figure 8 is a schematic view of the overall structure of the valve body provided in the exemplary embodiment of the present application; Figure 9 is a sectional view of the cross section where the first liquid inlet flow passage is located in the valve body provided in the exemplary embodiment of the present application; Figure 10 is a sectional view of the cross section where the second liquid inlet flow passage is located in the valve body provided in the exemplary embodiment of the present application.

[0025] Explanation of Reference Numerals: 1, pump body; 2, valve body; 3, plunger assembly; 4, liquid inlet valve; 5, liquid outlet valve; 6, pre-tightening assembly; 10, liquid inlet cavity; 11, liquid outlet cavity; 12, recessed portion; 13, liquid inlet passage; 20, first liquid inlet flow passage; 21, second liquid inlet flow passage; 22, liquid outlet flow passage; 23, protruded portion; 24, narrow waist; 30, packing gland assembly; 31, plunger body; 32, cooling cavity; 60, spring seat; 61, pre-tightening spring; 62, press sleeve; 200, first branch; 201, second branch; 300, pump cavity; 301, first cooling flow passage; 302, second cooling flow passage; 303, packing gland body; 304, packing gland press block; 305, packing seal assembly; 306, seal member; 2000, annular recess; 3030, recess; 3040, through hole; 3041, seal groove; 3050, gasket; 3051, water seal; DETAILED DESCRIPTION With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0026] Applicants note that as the requirements for carbon emissions of ships become increasingly stringent, methanol fuel gradually becomes the mainstream choice of clean energy for ships due to its low carbon characteristics. The methanol high-pressure plunger pump is the core supporting equipment of the methanol fuel engine. If it is directly installed in the engine room, it needs to meet the requirements of intrinsically safe design, that is, methanol fuel is not allowed to leak into the engine room environment. All methanol channels in the plunger pump that may be communicated with the environment are designed with a double-layer structure. The inner layer is a methanol channel, and the outer layer is used to monitor methanol leakage and completely isolate the risk of methanol leakage to the outside through multiple sealing structures. On this basis, the problem of accumulated friction heat of the plunger body 31 due to high-speed reciprocating motion of the friction sealing structure needs to be solved.

[0027] The cooling of the plunger body in the plunger pump is mostly designed with external circulating coolant or one-way self-cooling flow channel. However, if external circulation cooling is used in the methanol plunger pump, methanol fuel leakage and pollution of the coolant may occur due to seal failure, which violates the principle of intrinsic safety. Although the one-way self-cooling flow channel can avoid external pollution, it cannot form a cooling medium circulation, resulting in ineffective heat dissipation. In addition, if a backflow flow channel for the self-cooling medium in the cooling cavity is added in the pump head assembly, a large number of double-layer structures, process holes, and special plugs need to be added in the pump head, which will increase the design and processing difficulty of the flow channel and increase the risk of methanol leakage.

[0028] In view of the above, the application provides a plunger pump cooling device, comprising a pump body 1, a valve body 2 and a plunger assembly 3; the pump body 1 has a liquid inlet cavity 10 and a liquid outlet cavity 11; the valve body 2 is connected with the pump body 1 and forms the liquid inlet cavity 10 and the liquid outlet cavity 11 with the inner wall of the pump body 1 respectively, and the valve body 2 has a first liquid inlet flow channel 20, a second liquid inlet flow channel 21 and a liquid outlet flow channel 22; the plunger assembly 3 comprises a packing gland assembly 30 and a plunger body 31, the packing gland assembly 30 is connected with the pump body 1, the packing gland assembly 30 has a pump cavity 300, the plunger body 31 is arranged in the pump cavity 300 and connected with the packing gland assembly 30, and the plunger body 31 and the packing gland assembly 30 have a cooling cavity 32 therebetween; the packing gland assembly 30 has a first cooling flow channel 301 and a second cooling flow channel 302, the first cooling flow channel 301 is communicated with the liquid inlet cavity 10 and the cooling cavity 32, the second cooling flow channel 302 is communicated with the first liquid inlet flow channel 20 and the cooling cavity 32, the second liquid inlet flow channel 21 is communicated with the liquid inlet cavity 10 and the pump cavity 300, and the liquid outlet flow channel 22 is communicated with the pump cavity 300 and the liquid outlet cavity 11. In this way, the conveying medium in the plunger pump can be used as the cooling medium, without introducing external cooling liquid, and the safety hazard of mixed leakage of different media is avoided. By arranging the liquid inlet flow channel, the cooling flow channel and the liquid outlet flow channel 22 on the packing gland assembly 30 and the valve body 2, a complete and one-way flow plunger pump self-cooling path is formed, the plunger body 31 is continuously cooled while the plunger pump outputs the conveying medium, the medium cooled after the plunger body 31 is still output after being pressurized by the plunger pump after being discharged through the liquid outlet flow channel 22 and the liquid outlet cavity 11, and the waste of the conveying medium is avoided.

[0029] The plunger pump cooling device and the plunger pump of the application will be described in detail below with reference to the drawings. The features in the following examples and embodiments can be combined with each other without conflict.

[0030] Reference Figure 1According to a first aspect of this application, a plunger pump cooling device is provided, comprising a pump body 1, a valve body 2, and a plunger assembly 3; the pump body 1 has an inlet chamber 10 and an outlet chamber 11; the valve body 2 is connected to the pump body 1 and respectively encloses the inlet chamber 10 and the outlet chamber 11 with the inner wall of the pump body 1. The side portion of the inlet chamber 10 extends to the side of the pump body 1 to form an inlet, which is in communication with a conveying medium having a certain pressure. The valve body 2 has a first inlet channel 20, a second inlet channel 21, and a drain channel 22. The axis of the valve body 2 coincides with the axis of the plunger body 31, and the drain channel 22 passes through the axis of the valve body 2. The plunger assembly 3 includes a stuffing box assembly 30 and a plunger body 31. The stuffing box assembly 30 is connected to the pump body 1 and has a pump chamber 300. The plunger body 31 passes through the pump chamber 300 and is connected to the stuffing box assembly 30. One end of the plunger body 31 extends to the power end for drive connection, so that the plunger body 31 can reciprocate along the axial direction of the plunger body 31 within the pump chamber 300. A cooling chamber 32 is provided between the plunger body 31 and the stuffing box assembly 30. The stuffing box assembly 30 has a first cooling channel 301 and a second cooling channel 302. The first cooling channel 301 connects the inlet chamber 10 and the cooling chamber 32. Figure 2 and Figure 3 The second cooling channel 302 connects the first liquid inlet channel 20 and the cooling chamber 32, as shown in the reference. Figure 2 , Figure 4 and Figure 9 The second inlet channel 21 connects the inlet chamber 10 and the pump chamber 300, as shown in the reference. Figure 8 and Figure 10 The drainage channel 22 connects the pump chamber 300 and the drainage chamber 11, as shown in the reference. Figure 1 This configuration uses the pumped medium within the plunger pump as the cooling medium, eliminating the need for external coolant and avoiding the safety hazard of leakage due to mixing of different media. By setting inlet channels, cooling channels, and outlet channels 22 on the stuffing box assembly 30 and valve body 2, a complete, unidirectional flow self-cooling path for the plunger pump is formed. While the plunger pump outputs the pumped medium, it continuously cools the plunger body 31. The medium, after cooling the plunger body 31, is discharged through the outlet channel 22 and outlet chamber 11 and can still be pressurized and output by the plunger pump, avoiding waste of the pumped medium.

[0031] It can be understood that after the medium in the plunger pump cooling device enters the liquid inlet cavity 10 of the pump body 1, part of the medium flows into the cooling cavity 32 between the plunger body 31 and the stuffing box assembly 30 through the first cooling flow channel 301, and then flows back to the pump cavity 300 through the second cooling flow channel 302. When the plunger body 31 moves along the axial direction of the plunger body 31 away from the valve body 2, part of the medium enters the pump cavity 300 from the first liquid inlet flow channel 20, and the other part of the medium enters the pump cavity 300 from the liquid inlet cavity 10 through the second liquid inlet flow channel 21 and fills the pump cavity 300. When the plunger body 31 moves along the axial direction of the plunger body 31 towards the valve body 2, the medium in the pump cavity 300 enters the liquid outlet cavity 11 through the liquid outlet flow channel 22 and is discharged. The medium contacts the outer circumferential surface of the plunger body 31 to absorb the heat generated by friction, and the medium after absorbing heat is discharged through the liquid outlet cavity 11. The medium in the plunger pump circulates through the above steps, thereby realizing the self-cooling function of the plunger body 31.

[0032] In some embodiments, the delivery medium of the plunger pump can be methanol, or water or other low-flashpoint liquid fuel.

[0033] In some embodiments, referring to Figure 1 , the plunger pump comprises a liquid inlet valve 4, a liquid outlet valve 5 and a pre-tightening assembly 6. The liquid inlet valve 4 and the pre-tightening assembly 6 are located in the pump cavity 300, and the pre-tightening assembly 6 is arranged around the plunger body 31. The liquid inlet valve 4 is connected to the pre-tightening assembly 6 and the valve body 2 along the axial direction of the plunger body 31, and is used to control the opening and closing of the first liquid inlet flow channel 20 and the second liquid inlet flow channel 21. The liquid outlet valve 5 is located in the liquid outlet cavity 11, and is connected to the valve body 2 and the pump body 1 along the axial direction of the plunger body 31, and is used to control the opening and closing of the liquid outlet flow channel 22. It can be understood that the liquid inlet valve 4 and the liquid outlet valve 5 can realize precise control of the flow direction of the medium through linkage with the reciprocating movement of the plunger body 31. Specifically, when the plunger body 31 moves towards the driving end, the pressure in the pump cavity 300 decreases, and under the combined action of the pressure difference and the elastic force of the pre-tightening assembly 6, the liquid inlet valve 4 opens, at this time the first liquid inlet flow channel 20 and the second liquid inlet flow channel 21 are in a conductive state, and the medium can smoothly enter the pump cavity 300. At the same time, the liquid outlet valve 5 remains closed to prevent the medium that has entered the liquid outlet cavity 11 from flowing back. When the plunger body 31 moves towards the pump body 1, the pressure in the pump cavity 300 increases, the liquid inlet valve 4 closes, blocking the communication between the first liquid inlet flow channel 20 and the second liquid inlet flow channel 21 and the pump cavity 300, preventing the medium from leaking in the opposite direction. At the same time, the liquid outlet valve 5 opens, and the medium in the pump cavity 300 enters the liquid outlet cavity 11 through the liquid outlet flow channel 22 and is discharged.

[0034] In some embodiments, referring to Figure 1The packing gland assembly 30 comprises a packing gland body 303, a packing gland block 304 and a packing seal assembly 305. The packing gland body 303 has a pump cavity 300, and is connected to the pump body 1 and the valve body 2 away from one end of the plunger body 31. At least part of the packing gland block 304 is arranged in the pump cavity 300 and connected to the packing gland body 303. The packing seal assembly 305 is arranged in the pump cavity 300 and connected to the packing gland block 304 and the pre-tightening assembly 6 along the axial direction of the plunger body 31. The pump cavity 300 of the packing gland body 303 provides a closed space for the reciprocating movement of the plunger, the installation of the pre-tightening assembly 6 and the flow of medium. The packing gland body 303 is fixedly assembled to the pump body 1 by mechanical connection. The packing gland block 304 is partially arranged in the pump cavity 300 and connected to the packing gland body 303. For example, the packing gland block 304 and the packing gland body 303 are connected by threaded cooperation. The position of the packing gland block 304 along the axial direction of the plunger can be adjusted to apply a predetermined pressure to the packing seal assembly 305. The pre-tightening assembly 6 at the other end of the packing seal assembly 305 can be matched with the packing gland block 304 to form a bidirectional compression mechanism, so as to jointly apply an axial compression force to the packing seal assembly 305.

[0035] In some embodiments, with reference to Figure 1 , Figure 3 and Figure 4 , the packing gland body 303 has a groove 3030, and the opening of the groove 3030 is arranged towards the packing gland block 304. The groove 3030 is in communication with the first cooling flow channel 301 and the second cooling flow channel 302. According to Figure 5 , the packing gland block 304 has a through hole 3040, one end of the through hole 3040 is in communication with the groove 3030, and the other end of the through hole 3040 is arranged opposite to the plunger body 31. The cooling cavity 32 comprises the through hole 3040 and the groove 3030. The groove 3030 and the through hole 3040 are arranged to allow the medium to enter and cool the outer circumferential surface of the plunger body 31.

[0036] In some embodiments, with reference to Figure 1 and Figure 5 , the packing gland block 304 has a sealing groove 3041, and the opening of the sealing groove 3041 is arranged towards the plunger body 31. The packing gland assembly 30 comprises a sealing element 306, which is arranged in the sealing groove 3041 and forms a dynamic seal with the plunger body 31. It can be understood that the sealing groove 3041 is arranged on the inner circumferential surface of the packing gland block 304, and the sealing element 306 is arranged in the sealing groove 3041. The sealing element 306 functions to form a dynamic seal with the outer circumferential surface of the plunger body 31, block the medium in the cooling cavity 32, and prevent leakage of the medium. For example, the sealing element 306 can be a shaft seal, or other shaft sealing methods can be used.

[0037] In some embodiments, with reference toFigure 1 The packing seal assembly 305 includes a gasket 3050 and a water seal 3051, the gasket 3050 is connected with the packing cup 304 and the water seal 3051 along the axial direction of the plunger body 31 respectively, and the side of the water seal 3051 away from the gasket 3050 is connected with the pre-tightening assembly 6. It can be understood that the gasket 3050 serves as a buffer layer to connect the packing cup 304 and the water seal 3051 along the axial direction of the plunger body 31, which can uniformly transmit the pre-tightening force of the packing cup 304 to the water seal 3051 and avoid the direct contact between the packing cup 304 and the water seal 3051. The water seal 3051 serves as a sealing element, and the side of the water seal 3051 away from the gasket 3050 is connected with the pre-tightening assembly 6, which can always tightly adhere to the outer peripheral surface of the plunger under the action of the pre-tightening assembly 6 to form a dynamic sealing surface and block the path of the medium in the pump cavity 300 to the outside.

[0038] In some embodiments, with reference to Figure 1 The pre-tightening assembly 6 includes a spring seat 60, a pre-tightening spring 61 and a pressing sleeve 62, the spring seat 60 is connected with the pre-tightening spring 61 and the packing seal assembly 305 along the axial direction of the plunger body 31 respectively, and the pressing sleeve 62 is connected with the pre-tightening spring 61 and the valve body 2 along the axial direction of the plunger body 31 respectively. The packing cup 304 and the spring seat 60 form a bidirectional pre-tightening mechanism through the pre-tightening spring 61 to jointly apply an axial pre-tightening force to the gasket 3050 and the water seal 3051; at the same time, the pre-tightening spring 61 pre-tightens the pressing sleeve 62 and the liquid inlet valve 4 built in the pressing sleeve 62 to the end of the valve body 2 through the elastic pressure, so that the liquid inlet valve 4 can tightly adhere to the sealing surface of the valve body 2 in the closed state to block the reverse leakage of the first liquid inlet flow channel 20 and the second liquid inlet flow channel 21. In other embodiments, the pre-tightening assembly 6 can apply an axial pre-tightening force to the water seal 3051 and the gasket 3050 through the forms of air pressure, hydraulic pressure and the like, which is not specifically limited in the embodiments of the application.

[0039] In some embodiments, one of the valve body 2 and the pump body 1 is provided with a protrusion 23, and the other is provided with a recess 12, the protrusion 23 is embedded in the recess 12 to connect the pump body 1 and the valve body 2. With reference to Figure 8 The valve body 2 is provided with the protrusion 23 on the rear wall surface of the inlet of the first liquid inlet flow channel 20; with reference to Figure 7 The pump body 1 has the recess 12 corresponding to the protrusion 23, and the protrusion 23 and the recess 12 cooperate with each other to position the installation position of the valve body 2. Another function of the protrusion 23 is to separate the liquid inlet cavity 10 and the second cooling flow channel 302, so that the delivery medium cannot directly enter the second cooling flow channel 302 from the liquid inlet cavity 10. In other embodiments, the pump body 1 can be provided with the protrusion 23; correspondingly, the valve body 2 is provided with the recess 12 on the rear wall surface of the inlet of the first liquid inlet flow channel 20, and the recess 12 and the protrusion 23 cooperate with each other to position the installation position of the valve body 2.

[0040] In some embodiments, referring to Figure 9 , the first liquid inlet flow channel 20 comprises a first branch 200 and a second branch 201 in communication, the first branch 200 is in communication with the pump cavity 300, and the second branch 201 is in communication with the second cooling flow channel 302. The first branch 200 is arranged along the axial direction intersecting the plunger body 31, and the second branch 201 is arranged along the radial direction of the plunger body 31. It can be understood that the side of the first branch 200 facing the pump cavity 300 is provided with an annular groove 2000, and the first branch 200 extends obliquely from the annular groove 2000 along a direction at an angle with respect to the axial direction of the plunger body 31 to the second branch 201 and is in communication with the second branch 201. The second branch 201 extends along the radial direction of the plunger body 31 and is in communication with the second cooling flow channel 302.

[0041] In some embodiments, referring to Figure 10 , the side of the second liquid inlet flow channel 21 facing the pump cavity 300 is provided with an annular groove 2000, and the second liquid inlet flow channel 21 extends obliquely from the annular groove 2000 along a direction at an angle with respect to the axial direction of the plunger body 31, and penetrates out from the narrow waist 24 of the valve body 2, so as to be in communication with the liquid inlet cavity 10.

[0042] In some embodiments, referring to Figure 9 and Figure 10 , the angle between the second liquid inlet flow channel 21 and the axial direction of the plunger body 31 is the same as the angle between the first branch 200 and the axial direction of the plunger body 31. In this way, it is convenient to process without changing the processing part fixture.

[0043] In some embodiments, the valve body 2 has a plurality of first liquid inlet flow channels 20, and the plurality of first liquid inlet flow channels 20 are uniformly arranged along the outer periphery of the axial direction of the plunger body 31. The valve body 2 has a plurality of second liquid inlet flow channels 21, and the plurality of second liquid inlet flow channels 21 are uniformly arranged along the outer periphery of the axial direction of the plunger body 31. It can be understood that the first liquid inlet flow channel 20 and the second liquid inlet flow channel 21 are spaced and uniformly distributed in the circumferential direction around the axial direction of the plunger body 31. On the one hand, it ensures the stability of the structure of the valve body 2, and on the other hand, it avoids the problem of medium concentration caused by local flow channel concentration.

[0044] In some embodiments, referring to Figure 6 , the liquid inlet cavity 10 is in communication with the liquid inlet channel 13, and the liquid inlet channel 13 is used to connect the liquid inlet cavity 10 and the liquid inlet valve 4 to supplement the delivery medium entering the pump cavity 300, so as to avoid insufficient output flow caused by insufficient medium entering the pump cavity 300.

[0045] In some embodiments, the cross-sectional area of the first liquid inlet flow channel 20 is larger than the cross-sectional area of the second liquid inlet flow channel 21. Referring to Figure 9 and Figure 10The first liquid inlet flow channel 20 is used to quickly return the medium in the cooling cavity 32 that absorbs the heat of the plunger to the pump cavity 300, and the flow rate needs to meet the circulation efficiency of the cooling medium. If the flow rate is insufficient, the medium in the cooling cavity 32 will be retained to cause heat accumulation, thereby reducing the cooling effect. The main function of the second liquid inlet flow channel 21 is to supplement new medium from the liquid inlet cavity 10 to the pump cavity 300. When the inner diameter of the second liquid inlet flow channel 21 is smaller than that of the first liquid inlet flow channel 20, it is beneficial to balance the flow distribution of different liquid inlet flow channels, thereby ensuring the cooling effect of the medium.

[0046] In some embodiments, referring to Figure 2 The packing gland assembly 30 has a plurality of first cooling flow channels 301 that are uniformly arranged along the outer periphery of the axial direction of the plunger body 31. The packing gland assembly 30 has a plurality of second cooling flow channels 302 that are uniformly arranged along the outer periphery of the axial direction of the plunger body 31. It can be understood that the first cooling flow channels 301 and the second cooling flow channels 302 are spaced and uniformly distributed in the circumferential direction around the axial direction of the plunger body 31. This is beneficial to the medium to fully enter the cooling cavity 32 to cool the outer peripheral surface of the plunger body 31, and to ensure that the medium flow in the first cooling flow channels 301 and the second cooling flow channels 302 is continuously stable.

[0047] In some embodiments, referring to Figure 2 The number of the first cooling flow channels 301 and the number of the second cooling flow channels 302 are equal, and the hole diameters are equal. One of the first cooling flow channels 301 and the second cooling flow channels 302 is an inlet flow channel, and the other is a return flow channel. In this way, it can be avoided that the medium in the cooling cavity 32 is retained due to too many inlet flow channels and too few return flow channels, or that the supply of the cooling medium is insufficient due to too many return flow channels and too few inlet flow channels. The equal hole diameters can ensure that the medium flow through the inlet flow channel and the return flow channel per unit time is basically consistent, maintain the dynamic balance of the medium in the cooling cavity 32, avoid abnormal pressure fluctuations, and ensure that the medium continuously and stably flows through the cooling cavity 32 and fully contacts the plunger body 31 to efficiently take away the friction heat.

[0048] According to a second aspect of the present application, a plunger pump is provided, which comprises the above-mentioned plunger pump cooling device, and thus can have all the technical features and beneficial effects of the plunger pump cooling device, which will not be described herein again.

[0049] In the description of the present application, the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more features. In the description of the present application, the meaning of “a plurality of” is two or more, unless otherwise specifically limited.

[0050] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0051] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0052] The above are only the preferred embodiments of the present application, and do not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application and in accordance with the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A plunger pump cooling device, characterized in that, include: Pump body, the pump body having an inlet chamber and an outlet chamber; A valve body is connected to the pump body and forms the inlet chamber and the outlet chamber respectively with the pump body. The valve body has a first inlet channel, a second inlet channel and an outlet channel. A plunger assembly includes a stuffing box assembly and a plunger body. The stuffing box assembly is connected to the pump body and has a pump chamber. The plunger body passes through the pump chamber and is connected to the stuffing box assembly. A cooling chamber is provided between the plunger body and the stuffing box assembly. The stuffing box assembly has a first cooling channel and a second cooling channel. The first cooling channel connects the inlet chamber and the cooling chamber. The second cooling channel connects the first inlet channel and the cooling chamber. The second inlet channel connects the inlet chamber and the pump chamber. The drain channel connects the pump chamber and the drain chamber.

2. The plunger pump cooling device according to claim 1, characterized in that, The plunger pump includes an inlet valve, a outlet valve, and a pre-tightening assembly. The inlet valve and the pre-tightening assembly are located inside the pump chamber, and the pre-tightening assembly is arranged around the plunger body. The inlet valve is connected to the pre-tightening assembly and the valve body along the axial direction of the plunger body, and the inlet valve is used to control the opening and closing of the first inlet flow channel and the second inlet flow channel. The drain valve is located inside the drain chamber and is connected to the valve body and the pump body along the axial direction of the plunger body. The drain valve is used to control the opening and closing of the drain channel.

3. The plunger pump cooling device according to claim 2, characterized in that, The stuffing box assembly includes a stuffing box body, a stuffing box pressure block, and a stuffing seal assembly. The stuffing box body has the pump cavity. One end of the stuffing box body away from the plunger body is connected to the pump body and the valve body. At least a portion of the stuffing box pressure block passes through the pump cavity and is connected to the stuffing box body. The stuffing seal assembly is located in the pump cavity and is connected to the stuffing box pressure block and the preload assembly along the axial direction of the plunger body.

4. The plunger pump cooling device according to claim 3, characterized in that, The stuffing box body has a groove, the opening of which faces the stuffing box pressure block; the groove connects the first cooling channel and the second cooling channel; The stuffing box has a through hole, one end of which communicates with the groove, and the other end of which is disposed opposite to the plunger body. The cooling chamber includes the through hole and the groove.

5. The plunger pump cooling device according to claim 3, characterized in that, The stuffing box has a sealing groove, the opening of which is oriented toward the plunger body; The stuffing box assembly includes a seal that is located within the sealing groove and forms a dynamic seal with the plunger body.

6. The plunger pump cooling device according to claim 3, characterized in that, The packing seal assembly includes a gasket and a water seal. The gasket is connected to the packing gland block and the water seal along the axial direction of the plunger body, respectively. The side of the water seal away from the gasket is connected to the pre-tightening assembly.

7. The plunger pump cooling device according to claim 3, characterized in that, The preload assembly includes a spring seat, a preload spring, and a pressure sleeve. The spring seat is connected to the preload spring and the packing seal assembly along the axial direction of the plunger body, and the pressure sleeve is connected to the preload spring and the valve body along the axial direction of the plunger body.

8. The plunger pump cooling device according to claim 1, characterized in that, One of the valve body and the pump body is provided with a protrusion, and the other is provided with a recess. The protrusion is embedded in the recess to connect the pump body and the valve body.

9. The plunger pump cooling device according to claim 1, characterized in that, The first liquid inlet channel includes a first branch and a second branch that are connected to each other. The first branch is connected to the pump chamber, and the second branch is connected to the second cooling channel. The first branch extends along the axial direction intersecting the plunger body, and the second branch extends along the radial direction of the plunger body.

10. The plunger pump cooling device according to claim 9, characterized in that, The included angle between the second inlet channel and the axial direction of the plunger body is the same as the included angle between the first branch and the axial direction of the plunger body.

11. The plunger pump cooling device according to claim 1, characterized in that, The valve body has a plurality of first inlet channels, which are evenly arranged along the outer periphery of the plunger body along its axial direction; and / or The valve body has a plurality of second liquid inlet channels, which are evenly arranged along the outer periphery of the plunger body along the axial direction.

12. The plunger pump cooling device according to claim 1, characterized in that, The cross-sectional area of ​​the first liquid inlet channel is larger than that of the second liquid inlet channel.

13. The plunger pump cooling device according to claim 1, characterized in that, The stuffing box assembly has a plurality of first cooling channels, which are uniformly arranged along the outer periphery of the plunger body along its axial direction; and / or The stuffing box assembly has a plurality of second cooling channels, which are evenly distributed along the outer periphery of the plunger body along the axial direction.

14. A plunger pump, characterized in that, Includes the plunger pump cooling device as described in any one of claims 1 to 13.

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