A hydraulic plunger pump device without a shaft seal and capable of withstanding high inlet pressure

Abstract

The embodiment of the present invention discloses a water pressure plunger pump device that can withstand high inlet pressure without a shaft seal, comprising: a water pressure plunger pump for completing water pumping work, a submersible motor for driving the water pressure plunger pump to operate, a coupling, and a stainless steel metal pipe; the water pressure plunger pump and the submersible motor are connected by the coupling and then arranged in the stainless steel metal pipe, so that the submersible motor can drive the water pressure plunger pump to rotate synchronously in the stainless steel metal pipe. The use of the water pressure plunger pump device that can withstand high inlet pressure without a shaft seal as described in the present application avoids the use of shaft seals in the water pressure plunger pump, and can change the inlet structure pressure requirement from being limited by the pressure bearing capacity of the shaft seal to being equal to the pressure bearing capacity of the stainless steel metal pipe, thereby expanding the water absorption capacity of the pump product and improving the pressure bearing capacity and reliability of the pump product.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of mechanical manufacturing of water treatment equipment, and in particular to a water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure. Background Art

[0002] With the continuous development of the economy and society, hydraulic drive technology has become a new type of drive technology attracting widespread attention due to its outstanding advantages such as environmental protection, energy saving, and safety. Hydraulic piston pumps utilize flowing water as a self-lubricating medium, offer high operating pressures, high efficiency, and low power consumption. They are widely used in water treatment applications such as seawater desalination, landfill leachate treatment, and zero-discharge industrial wastewater. Hydraulic piston pumps are positive displacement pumps that convey fluids through the reciprocating axial motion of a plunger against a swash plate, generating volume changes. The basic operating principle of this pump is the same as that of a swash plate piston pump. Hydraulic piston pumps typically use lightweight mechanical seals for pump shafts, operating within a pressure range of 1 MPa. As is well known, mechanical seals are a key component of pump shaft sealing and are also prone to wear. When impurities are present in the water, mechanical seals are prone to wear, resulting in leakage of the conveyed fluid and contamination of the work site. In some special applications, the pump inlet pressure can be relatively high, reaching 4 MPa or even higher. In these cases, engineers can choose a medium-duty mechanical seal (operating pressure above 4 MPa) for pumps. While this can meet the requirement for high inlet pressures, if the mechanical seal fails, the high-pressure medium could be ejected, causing damage to personnel or other equipment. If the medium is hot or particularly corrosive or hazardous, the damage could be even greater. Furthermore, if the inlet pressure exceeds 6 MPa, selecting a suitable mechanical seal becomes even more difficult.

[0003] The mechanical seal of existing hydraulic plunger pumps is a vulnerable component. High inlet pressures further reduce the reliability of the seal, exacerbating the potential damage caused by its failure. Finding a reliable mechanical seal becomes particularly challenging at even higher inlet pressures. Therefore, to address these challenges, designing a hydraulic plunger pump that can withstand high inlet pressures without requiring a shaft seal has become a key research topic for those skilled in the art. Summary of the Invention

[0004] To this end, an embodiment of the present invention provides a water pressure plunger pump device that is seal-free and can withstand high inlet pressure, so as to solve the problem in the prior art that the water pressure plunger pump is limited by the pressure bearing capacity of the mechanical seal, resulting in poor water pressure tolerance and reliability of the water pressure plunger pump, which is easy to cause damage to personnel or other equipment.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] An embodiment of the present application provides a seal-free hydraulic plunger pump device that can withstand high inlet pressure, comprising: a hydraulic plunger pump for pumping water, a submersible motor for driving the hydraulic plunger pump, a coupling, and a stainless steel metal pipe; the hydraulic plunger pump and the submersible motor are connected by the coupling and are arranged in the stainless steel metal pipe, so that the submersible motor can drive the hydraulic plunger pump to rotate synchronously in the stainless steel metal pipe.

[0007] Furthermore, the coupling includes: a first submersible motor coupling and a second submersible motor coupling.

[0008] Furthermore, the sealless hydraulic plunger pump device capable of withstanding high inlet pressure also includes: a hydraulic plunger pump shaft and a submersible motor shaft; the hydraulic plunger pump and the submersible motor are connected via the coupling and are arranged in the stainless steel metal pipe. Specifically, the hydraulic plunger pump shaft and the submersible motor shaft are fixedly connected via the first submersible motor coupling and the second submersible motor coupling.

[0009] Furthermore, the stainless steel metal pipe includes: a pipe inlet shell, a pipe body and a pipe outlet shell; the pipe inlet shell, the pipe body and the pipe outlet shell are connected by welding.

[0010] Furthermore, the hydraulic plunger pump and the submersible motor are connected via the coupling and then disposed in the stainless steel metal pipe. Specifically, the hydraulic plunger pump and the submersible motor are connected via the coupling and then disposed in the pipe body.

[0011] Furthermore, the submersible motor is provided with a support seat for providing radial support and positioning.

[0012] Furthermore, the water pressure plunger pump includes: an inlet structure, and an outlet structure connected to the middle part of the rear cover of the water pressure plunger pump; the outlet structure is threadedly connected to the pipe end cover joint of the stainless steel metal pipe.

[0013] Furthermore, the hydraulic plunger pump and the submersible motor are fixed by bolts.

[0014] Furthermore, one end of the hydraulic plunger pump connected to the submersible motor is provided with a pump mounting flange for fixing a pump swash plate; the other end of the hydraulic plunger pump is also provided with a pump distribution plate.

[0015] Furthermore, the water pressure plunger pump is a swash plate plunger pump.

[0016] By using the shaft seal-free hydraulic plunger pump equipment that can withstand high inlet pressure as described in this application, after the submersible motor and the hydraulic plunger pump are sealed in the pipeline, the shaft seal of the hydraulic plunger pump can be eliminated, thereby avoiding the use of shaft seals in the hydraulic plunger pump. The inlet structure pressure requirement can be changed from being limited by the pressure bearing capacity of the shaft seal to being equal to the pressure bearing capacity of the stainless steel metal pipeline, thereby expanding the water absorption capacity of the pump product and improving the pressure tolerance and reliability of the pump product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0018] Figure 1 A schematic structural diagram of a water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure provided by an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of section AA of a water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure provided by an embodiment of the present invention;

[0020] Figure 3 A cross-sectional view of the BB portion of a water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure provided by an embodiment of the present invention;

[0021] Figure 4 A cross-sectional view of the CC portion of a water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure provided by an embodiment of the present invention.

[0022] in, Figure 1-4 In the figure: the submersible motor is 1, the submersible motor shaft is 2, the hydraulic plunger pump shaft is 3, the pump mounting flange is 4, the pump swash plate is 5, the pump housing is 6, the pump distribution plate is 7, the pump back cover is 8, the pipe end cover joint is 9, the pipe end cover is 10, the pipe threaded gland is 11, the pipe outlet is 12, the first submersible motor coupling is 13, the second submersible motor coupling is 14, the pump rotor is 15, the pipe outlet housing is 16, the pipe main body is 17, the pipe inlet housing is 18, the support seat is 19, the bolt is 20, the inlet structure is 21 and the outlet structure is 22. DETAILED DESCRIPTION

[0023] The following describes specific embodiments of the present invention. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are merely a portion of the embodiments of the present invention, and are not exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0024] The present invention discloses a water pressure plunger pump device that can withstand high inlet pressure without a shaft seal. A submersible motor and a water pressure plunger pump (hereinafter referred to as "pump") that can withstand a certain water pressure are fixed together, and then placed in a stainless steel metal pipe. The submersible motor is used to drive the water pressure plunger pump to complete the water pumping work. The submersible motor side in the stainless steel metal pipe is the water inlet side. After the water flows into the stainless steel metal pipe, it is sucked into the water pressure plunger pump through the gap between the submersible motor and the pipe wall, and then flows out from the outlet of the water pressure plunger pump and through the water outlet side of the pipe. Since the entire water pressure plunger pump (including the water pressure plunger pump shaft that originally required a mechanical seal) is immersed in the transported medium, there is no need to consider water leakage problems, and the original mechanical seal design is no longer required; the inlet pressure is borne by the stainless steel metal pipe, and the connection of the stainless steel metal pipe is sealed with static sealing elements, making the product more reliable and safe.

[0025] The following is a detailed description of an embodiment of the water pressure plunger pump device without a shaft seal and capable of withstanding high inlet pressure according to the present invention. Figure 1 As shown, it is a schematic diagram of the structure of a seal-free hydraulic plunger pump device that can withstand high inlet pressure, provided by an embodiment of the present application. The specific implementation process includes the following parts: a hydraulic plunger pump for completing water pumping work, a submersible motor 1 for driving the hydraulic plunger pump, a coupling, and a stainless steel metal pipe; the hydraulic plunger pump and the submersible motor 1 are connected by the coupling and then arranged in the stainless steel metal pipe. The connection part of the stainless steel metal pipe is sealed by a sealing structure, so that the submersible motor 1 can drive the hydraulic plunger pump to rotate synchronously in the stainless steel metal pipe. The coupling includes: a first submersible motor coupling 13 and a second submersible motor coupling 14.

[0026] The stainless steel metal pipe includes: a pipe inlet shell 18, a pipe body 17 and a pipe outlet shell 16; the pipe inlet shell 18, the pipe body 17 and the pipe outlet shell 16 are connected by welding.

[0027] In an embodiment of the present application, the sealless, high-inlet-pressure-resistant hydraulic plunger pump device further includes: a hydraulic plunger pump shaft 3 connected to the hydraulic plunger pump, and a submersible motor shaft 2 connected to the submersible motor 1. The hydraulic plunger pump and the submersible motor 1 are connected via the coupling and then disposed within the stainless steel metal pipe. Specifically, the hydraulic plunger pump shaft 3 is fixedly connected to the ends of the submersible motor shaft 2 via the first submersible motor coupling 13 and the second submersible motor coupling 14. After the fixed connection, the hydraulic plunger pump and the submersible motor 1 are further fixed via bolts 20 and disposed within the pipe body 17.

[0028] In addition, one end of the hydraulic plunger pump connected to the submersible motor 1 is provided with a pump mounting flange 4 for fixing the pump swash plate; the other end of the hydraulic plunger pump is also provided with a pump distribution plate 7 and a pump rear cover 8; Figure 1 As shown, the hydraulic plunger pump at least includes a pump rotor 15 and a pump housing 6. It should be noted that since the pump rotor 15 has a relatively common rotor structure, the present invention Figure 1 The pump rotor 15 is not shown in detail, but is replaced by a frame.

[0029] Further, such as Figure 2 Figure 1 shows a cross-sectional view taken along section AA of a sealless, high-inlet-pressure-tolerant hydraulic plunger pump device according to an embodiment of the present invention. To prevent slippage of the submersible motor 1 installed within the stainless steel pipe, support blocks 19 are provided on the submersible motor 1 to provide radial support and positioning. It should be noted that the number of support blocks 19 providing radial support and positioning can be adjusted based on actual circumstances and is not specifically limited herein.

[0030] During the specific implementation process, the hydraulic plunger pump and the submersible motor 1 are connected through the coupling and then arranged in the stainless steel metal pipe. The specific implementation process is: the hydraulic plunger pump without mechanical seal is fixed at the installation stop of the submersible motor 1, the hydraulic plunger pump shaft 3 and the submersible motor shaft 2 are connected through a coupling, and after the hydraulic plunger pump and the submersible motor 1 are fixed by bolts 20, they are further arranged in the pipe body 17 of the stainless steel metal pipe, so that the submersible motor 1 can drive the hydraulic plunger pump to rotate stably and synchronously in the stainless steel metal pipe.

[0031] like Figure 3 , which is a cross-sectional view of the BB portion of a sealless hydraulic plunger pump device capable of withstanding high inlet pressure provided by an embodiment of the present invention. After the submersible motor 1 and the hydraulic plunger pump are connected via a coupling, at least two bolts 20 are symmetrically arranged for fixing.

[0032] like Figure 4 , which is a cross-sectional view of the CC portion of a sealless, high-inlet-pressure-tolerant hydraulic plunger pump device provided by an embodiment of the present invention. The hydraulic plunger pump further includes an inlet structure 21 and an outlet structure 22 connected to the center portion of the rear cover of the hydraulic plunger pump. The outlet structure 22 is threadedly connected to the pipe end cap connector 9 of the stainless steel metal pipe. The hydraulic plunger pump is secured to the rear end of the submersible motor 1 by at least two bolts 20.

[0033] from Figure 1 and Figure 4 It can be seen that the features of the pump back cover 8 may include: unlike the inlet structure 21 of a conventional hydraulic plunger pump, which has to consider the possible impact on the flow area caused by the pipeline connection form, the inlet structure 21 here can enlarge the inlet without affecting the structural strength so that the medium can better flow into the pump rotor 15; the outlet structure 22 is opened to the middle of the pump back cover 8, so that it can be threaded and connected with the subsequent pipe end cover joint 9 of the stainless steel metal pipe.

[0034] The implementation process of the present invention is as follows: first, the submersible motor shaft 2 and the hydraulic plunger pump shaft 3 are respectively installed with the first submersible motor coupling 13 and the second submersible motor coupling 14, and then the hydraulic plunger pump is fixed to the tail of the submersible motor 1 by at least two bolts 20 while aligning with the coupling of the submersible motor 1, and then the pipe end cover joint 9 and the pipe outlet 12 are welded to the pipe end cover 10, and the pipe end cover joint 9 is screwed into the center hole of the pump back cover 8 and sealed by an O-ring; then the submersible motor 1, the hydraulic plunger pump and the pipe end cover 10 are inserted into the stainless steel metal pipe together, and finally axially positioned by the end face of the pipe outlet shell 16 and sealed by an O-ring, and the pipe threaded cover 11 is threadedly connected to the pipe outlet shell 16 to achieve axial position fixation of the internal components of the pipe; the pipe end cover 10 and the support seat 19 of the submersible motor 1 together achieve radial position fixation of the internal components of the pipe (coaxial with the pipe outlet shell 16, the pipe body 17 and the pipe inlet shell 18).

[0035] During the specific implementation process, the medium (such as seawater, landfill leachate or industrial wastewater, etc.) enters through the copy forest interface channel of the pipeline inlet shell 18, passes through the gap between the submersible motor 1 and the pipeline body 17, and enters the low-pressure side of the pump rotor 15 through the inlet structure 21 of the pump back cover 8 and the suction groove of the pump distribution plate 7. Through the rotation of the pump rotor 15, the medium enters the high-pressure side, and enters the outlet structure 22 of the pump back cover 8 from the discharge groove of the pump distribution plate 7, and finally flows out after passing through the pipeline end cover joint 9, the pipeline end cover 10 and the pipeline outlet 12. Since the hydraulic plunger pump is entirely immersed in the medium inside the stainless steel metal pipe, the hydraulic plunger pump shaft 3 connected to the hydraulic plunger pump no longer requires a mechanical sealing structure to prevent leakage. At the same time, as long as the pressure-bearing capacity of the stainless steel metal pipe is sufficient, there is no need to worry about leakage caused by excessive pressure in the hydraulic plunger pump inlet and the risks it may bring. It should be noted that the pipe inlet housing 18, the pipe outlet housing 16 and the pipe body 17 are sealed by welding. Of course, other structural forms that can achieve pipe connection are also possible and are not specifically limited here.

[0036] By using the shaft seal-free hydraulic plunger pump equipment that can withstand high inlet pressure as described in the present invention, after the submersible motor and the hydraulic plunger pump are sealed in a stainless steel metal pipe, the use of shaft seals for the hydraulic plunger pump can be avoided, and the inlet structure pressure requirement can be changed from being limited by the pressure bearing capacity of the shaft seal to being equal to the pressure bearing capacity of the stainless steel metal pipe, thereby expanding the water absorption capacity of the pump product and improving the pressure tolerance and reliability of the pump product.

[0037] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic plunger pump device without a shaft seal and capable of withstanding high inlet pressure, characterized in that: include: A hydraulic plunger pump for pumping water, a submersible motor for driving the hydraulic plunger pump, a coupling, and a stainless steel metal pipe; the hydraulic plunger pump and the submersible motor are connected by the coupling and arranged in the stainless steel metal pipe, so that the submersible motor can drive the hydraulic plunger pump to rotate synchronously in the stainless steel metal pipe; The coupling comprises: a first submersible motor coupling and a second submersible motor coupling; Also included: hydraulic plunger pump shaft, and submersible motor shaft; The hydraulic plunger pump and the submersible motor are connected via the coupling and are then arranged in the stainless steel metal pipe. Specifically, the hydraulic plunger pump shaft and the submersible motor shaft are fixedly connected via the first submersible motor coupling and the second submersible motor coupling. The stainless steel metal pipe comprises: a pipe inlet shell, a pipe body and a pipe outlet shell; the pipe inlet shell, the pipe body and the pipe outlet shell are connected by welding; The hydraulic plunger pump and the submersible motor are connected by the coupling and are arranged in the stainless steel metal pipe. Specifically, the hydraulic plunger pump and the submersible motor are connected by the coupling and are arranged in the pipe body; wherein, the submersible motor side in the stainless steel metal pipe is the water inlet side. After the water flows into the stainless steel metal pipe, it is sucked into the hydraulic plunger pump through the gap between the submersible motor and the pipe wall, and then flows out from the outlet of the hydraulic plunger pump and through the water outlet side of the pipe.

2. The seal-free hydraulic plunger pump device capable of withstanding high inlet pressure according to claim 1, characterized in that: The submersible motor is provided with a support seat for providing radial support and positioning.

3. The sealless hydraulic plunger pump device capable of withstanding high inlet pressure according to claim 1, characterized in that: The water pressure plunger pump comprises: an inlet structure, and an outlet structure connected to the middle part of the rear cover of the water pressure plunger pump; the outlet structure is threadedly connected to the pipe end cover joint of the stainless steel metal pipe.

4. The sealless hydraulic plunger pump device capable of withstanding high inlet pressure according to claim 1, characterized in that: The hydraulic plunger pump and the submersible motor are fixed by bolts.

5. The sealless hydraulic plunger pump device capable of withstanding high inlet pressure according to claim 1, characterized in that: One end of the water pressure plunger pump connected to the submersible motor is provided with a pump mounting flange for fixing a pump swash plate; the other end of the water pressure plunger pump is also provided with a pump distribution plate.

6. The sealless hydraulic plunger pump device capable of withstanding high inlet pressure according to claim 1, characterized in that: The water pressure plunger pump is a swash plate plunger pump.

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