阅读说明：本技术 一种跑道融雪复合管用注浆泵及其工作方法 (Grouting pump for runway snow melting composite pipe and working method of grouting pump ) 是由 刘斌 江绍辉 王辉 姜微微 于 2020-06-17 设计创作，主要内容包括：本发明提供一种跑道融雪复合管用注浆泵,注浆泵适用于小流量、高扬程,流体具有高粘性、大密度的特性,跑道融雪复合管用注浆泵为容积式往复泵,利用工作腔中容积周期性变化来输送流体,适用于输送流量较小、扬程较高的各种介质,符合该流体(浆料)输运特征。注浆泵为轴向柱塞泵,即柱塞平行于缸体轴线布置,具体为斜盘式轴向柱塞泵,包括柱塞(1)、缸体(2)、配流盘(3)、传动轴(4)、斜盘(5)、滑靴(6)、回程盘(7)及中心弹簧(8)。跑道融雪复合管用注浆泵的工作方法,柱塞腔,与配流盘排油窗相通,油液通过排油窗排出,形成排油过程；缸体每转一周,各个柱塞有半周吸油,半周排油；如果缸体不断旋转,泵便连续地吸油和排油。(The invention provides a grouting pump for a runway snow melting composite pipe, which is suitable for small flow and high lift, fluid has the characteristics of high viscosity and high density, and the grouting pump for the runway snow melting composite pipe is a positive displacement reciprocating pump, is used for conveying the fluid by utilizing the periodic change of the volume in a working cavity, is suitable for conveying various media with small flow and high lift, and accords with the conveying characteristics of the fluid (slurry). The grouting pump is an axial plunger pump, namely plungers are arranged in parallel to the axis of a cylinder body, and specifically is a swash plate type axial plunger pump which comprises plungers (1), a cylinder body (2), a valve plate (3), a transmission shaft (4), a swash plate (5), a sliding shoe (6), a return plate (7) and a central spring (8). The work method of the grouting pump for the runway snow melting composite pipe comprises the following steps that a plunger cavity is communicated with an oil discharge window of a valve plate, and oil is discharged through the oil discharge window to form an oil discharge process; each plunger has oil absorption in half cycle and oil discharge in half cycle per cycle of the cylinder body; if the cylinder body rotates continuously, the pump continuously sucks oil and discharges oil.)

1. The utility model provides a compound effective grouting pump of runway snow melt which characterized in that: the grouting pump is suitable for small flow and high lift, fluid has the physical characteristics of high viscosity and large density, and the grouting pump for the runway snow melting composite pipe is a positive displacement reciprocating pump.

2. The grouting pump for the runway snow-melting composite pipe as claimed in claim 1, wherein: the grouting pump is an axial plunger pump, i.e. the plungers are arranged parallel to the cylinder axis.

3. The grouting pump for the runway snow-melting composite pipe as claimed in claim 2, wherein: the grouting pump is a swash plate type axial plunger pump and comprises a plunger (1), a cylinder body (2), a valve plate (3), a transmission shaft (4), a swash plate (5), a sliding shoe (6), a return plate (7) and a central spring (8), wherein the sliding shoe (6) is mounted at the head of the plunger (1), the bottom surface of the sliding shoe (6) always moves along the plane of the swash plate (5), the return plate (7) is adjacent to and attached to the sliding shoe (6), and the central spring (8) is supported below the plunger (1).

4. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: the oil distribution disc (3) and the cylinder body (2), the sliding shoes (6) and the plunger (1) are both supported by static pressure, the plunger (1) and the cylinder body (2) of the plunger type hydraulic pump are both cylindrical, and the plunger (1) is a stressed part of a swash plate type axial plunger pump.

5. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: the hydraulic design parameters of the swash plate type axial plunger pump are obtained through design calculation: the outer diameter d of the plunger (1) is 35 mm; the cross-sectional area of the plunger (1) is A-962.11 mm²(ii) a The maximum stroke of the plunger (1) is h_p38 mm; the number of the plungers (1) is Z-7; the rotating speed of the transmission shaft is n-100 r/min; the radius R of a distribution circle of the plunger (1) is 58 mm; the angle of inclination of the swash plate (5) is gamma18°。

6. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: the swash plate type axial plunger pump has the characteristics of 30: 10: 90-water: grouting agent H-60: a slurry of cement having a slurry density of 2590kg/m³The grouting pressure is 1.2MPa, two ends of the inner pipe are plugged, the pressure in the inner pipe is about 0.4MPa, the grouting speed is about 0.5m/s, the grouting time is 2-3 minutes, and the designed lift of the grouting pump is 47.3m by calculation.

7. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: the pipe fitting of the swash plate type axial plunger pump is an inner sleeve and an outer sleeve, grouting is carried out between the inner sleeve and the outer sleeve to fill, so that heat conduction is enhanced, the outer pipe is a steel sleeve, the pipe diameter is 40mm, the inner pipe is a polyethylene heating pipe, the pipe diameter is 25mm, namely the grouting flow cross section is 765.76mm²And the grouting flow is 0.383L/s, namely 23L/min, and the grouting amount is 69L after 3 minutes.

8. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: in the swash plate type axial plunger pump, a plane oil distribution mechanism is adopted by the valve plate (3), sealing belts are adopted at the inner and outer edges of a flow distribution port of the valve plate (3), and a dynamic pressure wedge auxiliary support is arranged inside and outside the sealing belts, so that a cylinder body floats to form an oil film. The valve plate (3) comprises two oil distribution windows, an inner sealing belt, an outer sealing belt, an auxiliary support and an oil drainage channel.

9. The grouting pump for the runway snow-melting composite pipe as claimed in claim 3, wherein: the flow distribution plate (3) is an oil distribution plate with static pressure supports, a group of static pressure supports are arranged on the outer periphery or the inner periphery of an oil distribution window of the oil distribution plate, so that a stable oil film is formed between the cylinder body and the plane of the oil distribution plate, and the thickness of the oil film is 5-10 micrometers.

10. A method of operating a slurry pump for a composite snow melting conduit according to any one of claims 1 to 9, comprising: when the cylinder block drives the plunger piston to rotate, the plunger piston (1) is forced to do linear reciprocating motion in the plunger piston cavity because the inclined plate plane has an inclined angle gamma relative to the cylinder block; when the cylinder body rotates and the plunger piston continuously extends from a bottom dead center corresponding to a 180-degree position within a range of 180-360 degrees, the volume of a cavity of the plunger piston continuously increases until the plunger piston corresponds to a top dead center corresponding to a 0-degree position; in the process, the plunger cavity is just communicated with the oil suction window of the port plate (3), and oil is sucked into the plunger cavity, which is the oil suction process; along with the continuous rotation of the cylinder body, in the range of 0-180 degrees, the plunger piston continuously enters the cavity from the top dead center under the constraint of the swash plate, and the volume of the plunger piston cavity is continuously reduced until the bottom dead center is reached; in the process, the plunger cavity is communicated with the oil discharge window of the port plate, and oil is discharged through the oil discharge window to form an oil discharge process; each plunger has oil absorption in half cycle and oil discharge in half cycle per cycle of the cylinder body; if the cylinder body rotates continuously, the pump continuously sucks oil and discharges oil.

Technical Field

The invention relates to the technical field of public buildings and industrial buildings, in particular to a grouting pump for a runway snow-melting composite pipe and a working method thereof.

Background

The fluid heating snow melting technology is that heat exchange pipelines are laid under a road to distribute external heat in a fluid form, so that heat exchange between fluid and accumulated snow on a road surface is realized, and the normal use of the road surface is guaranteed. The heat exchange tube buried under the pavement can not only melt the accumulated snow on the pavement through heat exchange, but also can bear the huge impact force when an airplane lands without influencing the structural stress of the pavement.

The fluid heating snow melting system uses a circulating pump to circulate heated liquid in a pipeline buried in the road surface, heat is transferred to the road surface structure from a circulating medium through convective heat transfer at the pipe wall, the heat is transferred to the surface of an object by heat conduction in the structure layer, and then heat exchange is carried out through heat transfer and ice and snow, so that the purposes of melting snow and ice are achieved. In the fluid heating snow melting system, the glycol aqueous solution with low freezing point can be used as a circulating medium; the pipes buried in the pavement are generally required to have good strength and flexibility so as to be convenient for installation during construction and have good capability of resisting airplane load during use. The fluid heating method adopts a circulating pump as a power system, improves the controllability of the system, and has no special requirements on the inclination of the pipeline and the cleanness degree of the interior of the pipeline.

In order to meet the requirements, the pipeline buried under the ground is a field processing composite pipe, the outer sleeve pipe is a DN40 steel pipe, the inner sleeve pipe is a De25De polyethylene pipeline, and special cement slurry is filled in the gap between the two pipes so as to ensure the strength and the heat exchange effect of the composite pipe. How to meet the design requirement in the field construction process is to design a special grouting pump according to conditions, but the prior art does not have the special grouting pump designed for the condition.

Disclosure of Invention

The present invention is designed to overcome the problems of the prior art, and an object of the present invention is to provide a specially designed slurry pump for a runway snow-melting composite pipe, which is suitable for a small flow rate, a high lift, and a fluid having physical characteristics of high viscosity and high density, and which is a positive displacement reciprocating pump.

Preferably, the grouting pump is an axial plunger pump, i.e. the plungers are arranged parallel to the cylinder axis.

Preferably, the grouting pump is a swash plate type axial plunger pump and comprises a plunger (1), a cylinder body (2), a valve plate (3), a transmission shaft (4), a swash plate (5), a sliding shoe (6), a return plate (7) and a central spring (8), wherein the sliding shoe (6) is mounted at the head of the plunger (1), the bottom surface of the sliding shoe (6) always moves along the plane of the swash plate (5), the return plate (7) is adjacent to and attached to the sliding shoe (6), and the central spring (8) is supported below the plunger (1).

Preferably, the oil distribution disc (3) and the cylinder body (2), the piston shoes (6) and the plunger (1) adopt a static pressure support, the plunger (1) and the cylinder body (2) of the plunger type hydraulic pump are cylindrical, and the plunger (1) is a stressed part of a swash plate type axial plunger pump.

Preferably, the hydraulic design parameters of the swash plate type axial plunger pump are obtained through design calculation: the outer diameter d of the plunger (1) is 35 mm; the cross-sectional area of the plunger (1) is A-962.11 mm²(ii) a The maximum stroke of the plunger (1) is h_p38 mm; the number of the plungers (1) is Z-7; the rotating speed of the transmission shaft is n-100 r/min; the radius R of a distribution circle of the plunger (1) is 58 mm; the inclination angle γ of the swash plate (5) is 18 °.

Preferably, the swash plate type axial plunger pump has a fluid transport characteristic of 30: 10: 90-water: grouting agent H-60: a slurry of cement having a slurry density of 2590kg/m³Grouting pressure is 1.2 MPa, two ends of the inner pipe are sealed, the pressure in the inner pipe is about 0.4MPa, grouting speed is about 0.5m/s, and grouting time is shortenedThe designed lift of the grouting pump is 47.3m by calculation for 2-3 minutes.

Preferably, the pipe fitting of the swash plate type axial plunger pump is an inner sleeve and an outer sleeve, and the inner sleeve and the outer sleeve are filled by grouting to enhance heat conduction, wherein the outer pipe is a steel sleeve, the pipe diameter is 40mm, the inner pipe is a polyethylene heating pipe, the pipe diameter is 25mm, namely the grouting flow cross section is 765.76mm ²And the grouting flow is 0.383L/s, namely 23L/min, and the grouting amount is 69L after 3 minutes.

Preferably, in the swash plate type axial plunger pump, the valve plate (3) adopts a plane oil distribution mechanism, sealing belts are adopted at the inner and outer edges of a valve port of the valve plate (3), and a dynamic pressure wedge auxiliary support is arranged inside and outside the valve plate to float the cylinder body to form an oil film. The valve plate (3) comprises two oil distribution windows, an inner sealing belt, an outer sealing belt, an auxiliary support and an oil drainage channel.

Preferably, the flow distribution plate (3) is a static pressure support oil distribution plate, a group of static pressure supports are arranged on the outer periphery or the inner periphery of an oil distribution window of the oil distribution plate, so that a stable oil film is formed between the cylinder body and the plane of the oil distribution plate, and the thickness of the oil film is 5-10 microns.

Preferably, the present invention also provides a method for operating a slurry pump for a composite snow melting pipe on a runway, including: when the cylinder block drives the plunger piston to rotate, the plunger piston (1) is forced to do linear reciprocating motion in the plunger piston cavity because the inclined plate plane has an inclined angle gamma relative to the cylinder block; when the cylinder body rotates and the plunger piston continuously extends from a bottom dead center corresponding to a 180-degree position within a range of 180-360 degrees, the volume of a cavity of the plunger piston continuously increases until the plunger piston corresponds to a top dead center corresponding to a 0-degree position; in the process, the plunger cavity is just communicated with the oil suction window of the port plate (3), and oil is sucked into the plunger cavity, which is the oil suction process; along with the continuous rotation of the cylinder body, in the range of 0-180 degrees, the plunger piston continuously enters the cavity from the top dead center under the constraint of the swash plate, and the volume of the plunger piston cavity is continuously reduced until the bottom dead center is reached; in the process, the plunger cavity is communicated with the oil discharge window of the port plate, and oil is discharged through the oil discharge window to form an oil discharge process; each plunger has oil absorption in half cycle and oil discharge in half cycle per cycle of the cylinder body; if the cylinder body rotates continuously, the pump continuously sucks oil and discharges oil.

Adopt above-mentioned technical scheme's beneficial effect to lie in:

the pump is suitable for small flow and high lift, and the fluid has the physical characteristics of high viscosity and high density, and the volumetric reciprocating pump is adopted to convey the fluid by utilizing the periodic change of the volume in the working cavity, so that the pump is suitable for conveying various media with small flow and high lift, such as various liquids with high viscosity, corrosiveness, flammability, explosiveness and the like. Conforming to the fluid (slurry) transport characteristics.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Brief description of the drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in view of the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a grouting pump according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a grouting sleeve according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a plunger motion process according to an embodiment of the present invention;

FIG. 4 is a schematic representation of the direction of plunger movement versus direction of flow in accordance with an embodiment of the present invention;

FIG. 5 is a fluid domain model diagram of a plunger pump according to an embodiment of the invention;

FIG. 6 illustrates a single plunger fluid field maximum formation according to an embodiment of the present invention;

FIG. 7 is a plunger profile according to an embodiment of the present invention;

FIG. 8 is a dimensional scale between objects at 18 degrees swash plate plunger inclination according to an embodiment of the invention;

FIG. 9 is a schematic structural diagram of a port plate according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of plunger pump fluid domain meshing according to an embodiment of the present invention;

FIG. 11 is a simplified rear plunger mesh and cross-sectional view according to an embodiment of the present invention;

FIG. 12 is a longitudinal pressure cloud inside a plunger basin according to an embodiment of the present invention;

FIG. 13 is a graph of plunger basin outlet pressure according to an embodiment of the present invention;

FIG. 14 is a longitudinal cross-sectional turbulent kinetic energy cloud in accordance with an embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the present invention is not limited thereto.

The embodiment provides a specially designed grouting pump for a runway snow melting composite pipe.

The pump is selected to be a positive displacement reciprocating pump because the design requirement of the pump is small flow, high lift, and the physical characteristics of high viscosity and high density of the fluid. The positive displacement reciprocating pump conveys fluid by utilizing the periodic change of the volume in the working cavity, and is suitable for conveying various media with small flow and high lift, such as various liquids with high viscosity, corrosiveness, flammability, explosiveness and the like. Conforming to the fluid (slurry) transport characteristics.

To accommodate this, axial plunger pumps have been chosen, i.e. the plungers are arranged parallel to the cylinder axis. The working principle of the plunger pump is that when the cylinder body is driven, the plunger reciprocates in the cylinder hole, the volume of a closed cavity formed by the plunger, the cylinder body and the flow distribution parts is changed, and the oil suction and discharge processes are completed.

The axial plunger pump mainly has two structural forms of a swash plate type (also called a straight shaft type) and a swash shaft type, generally adopts a valve plate to distribute flow, and adopts the design of the swash plate type axial plunger pump in the invention. The efficiency of the plunger pump is the highest in various hydraulic pumps, the volumetric efficiency is generally about 95%, the total efficiency is more than 90%, the more important than the efficiency is the capability of the plunger pump to move with high reliability under the high-power working condition, and the service life of the plunger pump cannot be obviously reduced on the occasions of pressure impact and large temperature change. This capability has become the only possibility to use high water based working media at pressures of 14MPa or more, other kinds of hydraulic pumps are generally limited to working pressures below 10 MPa. The plunger pump developed by applying the modern technology is typically a through-shaft swash plate type axial plunger pump, meets the basic characteristics of the modern hydraulic transmission and control, and has the advantages of high efficiency, energy conservation, environmental protection and high reliability.

The swash plate type axial plunger pump has the advantages of compact structure, few parts, good manufacturability, low cost, small volume, light weight and the like, and the axial pump is simple in structure and low in manufacturing cost compared with a radial pump; the swash plate type axial plunger pump is easy to realize stepless variable, small in size, light in weight and convenient to maintain; therefore, compared with other pumps, the swash plate type axial plunger pump has great advantages in technical and economic indexes, so that the swash plate type axial plunger pump is continuously improved and developed in the following development directions: the hydraulic control system has the advantages of expanding the application range, improving the parameters, improving the performance, prolonging the service life and reducing the noise so as to meet the requirement of continuous development of the hydraulic technology. The swash plate type axial plunger pump is a main part in a hydraulic system, changes the volume in a plunger cavity by the reciprocating motion of a plunger in the plunger cavity to realize oil absorption and oil discharge, and is one of positive displacement hydraulic pumps. The plunger is one of main stressed parts of the swash plate type axial plunger pump; the sliding shoe is one of the forms commonly adopted by the prior high-pressure plunger pump, and can meet the requirements of high pressure and high rotating speed; the quality of the port plate design also directly affects the efficiency and life of the pump.

As shown in figure 1, the swash plate type axial plunger pump comprises a plunger (1), a cylinder body (2), a valve plate (3), a transmission shaft (4), a swash plate (5), a sliding shoe (6), a return plate (7) and a central spring (8), wherein the sliding shoe (6) is mounted at the head of the plunger (1), the bottom surface of the sliding shoe (6) always moves along the plane of the swash plate (5), the return plate (7) is adjacent to and attached to the sliding shoe (6), and the central spring (8) is supported below the plunger (1).

The hydraulic design parameters of the swash plate type axial plunger pump are calculated through design:

plunger outside diameter: d is 35 mm;

plunger cross-sectional area: a is 962.11mm²；

Maximum stroke of the plunger: h is_p＝38mm；

Number of plungers: z is 7;

rotating speed of the transmission shaft: n is 100 r/min;

plunger distribution circle radius: r is 58 mm;

inclination angle of swash plate: gamma 18 °

The swash plate type axial plunger pump is used for conveying fluid, and has the characteristics of 30: 10: 90-water: grouting agent (H-60): a cement paste having a density of 2590kg/m³The grouting pressure is 1.2MPa, two ends of the inner pipe are plugged, the pressure in the inner pipe is about 0.4MPa, the grouting speed is about 0.5m/s, the grouting time is 2-3 minutes, and the designed lift of the grouting pump is 47.3m by calculation.

As shown in figure 2, the pipe is an inner sleeve and an outer sleeve, and the space between the inner sleeve and the outer sleeve is filled by grouting, so that the heat conduction is enhanced, wherein the outer pipe is a steel sleeve, the pipe diameter is 40mm, the inner pipe is a polyethylene heating pipe, the pipe diameter is 25mm, namely the grouting flow cross section is 765.76mm ²And the grouting flow is 0.383L/s, namely 23L/min, and the grouting amount is 69L (calculated according to 3 minutes).

Fig. 3 shows the movement of the plunger, which during the movement forms a graph of the direction of movement of the plunger as shown in fig. 4 with respect to the direction of flow.

A fluid domain model diagram of the plunger pump is shown in fig. 5. The swash plate type axial plunger pump further comprises an oil suction window (9) and an oil discharge window (10), the opposite plungers (1) are respectively arranged on the top surfaces of the inlet section (11) and the outlet section (12), the inlet section (11) is connected with the inlet extension section (14) through the inlet bent pipe section (13), and the outlet section (12) is connected with the outlet extension section (16) through the outlet bent pipe section (15).

As shown in fig. 9, in the disc-type axial plunger pump, the flow distribution portion is one of the most critical portions, and directly affects the reliability and life of the hydraulic pump. The flow distribution mechanism has a plane and a spherical surface, and in the plunger pump, a plane oil distribution mechanism is mostly adopted. The oil distribution mechanism should be reliable in operation, have minimal leakage and minimal wear on the sliding surfaces. Therefore, an oil film with a certain thickness is required to be formed between the cylinder body and the plane of the oil distribution disc to prevent metal from directly contacting, and meanwhile, the oil film is required to be the oil film with the lowest energy consumption. In order to increase the sealing performance, sealing belts are adopted at the inner and outer edges of the flow distribution port, and dynamic pressure wedge auxiliary supports are arranged inside and outside the sealing belts, so that the cylinder body floats to form an oil film. Practical operation has shown that such a distribution mechanism is available. However, the inclined plane processing of the dynamic pressure wedge is inconvenient, so that a plane auxiliary support is developed, the support force is generated by the temperature gradient, and the oil distribution disc has the following structure: two oil distribution windows, an inner sealing belt, an outer sealing belt, an auxiliary support, an oil drainage channel and the like. Since the oil distribution pan of this structure is used in a hydraulic pump for mass production and a wear phenomenon occurs frequently, in practice, special attention is paid to material selection and precision in addition to the structural size.

Due to the development of the static pressure supporting technology, a static pressure supporting oil distribution disc is developed, a group of static pressure supports are specially arranged on the outer periphery (or the inner periphery) of an oil distribution window of the oil distribution disc so as to form a stable oil film between a cylinder body and the plane of the oil distribution disc, and the thickness is generally considered to be about 5-10 micrometers. However, since there is no relation between the supporting force of the pressure field in the oil distribution window of the oil distribution structure and the oil distribution gap, and a stable oil film cannot be obtained or even cannot be operated only by balancing the supporting force with the pressing force of the plunger, in order to achieve the above requirements, the supporting force of the pressure field can balance most of the pressing force, and the remaining pressing force is received by the auxiliary support of the oil distribution portion, so that a stable and appropriate oil film thickness is sought to be maintained.

In this embodiment, R is obtained by design calculation₀＝5.5cm；R₁＝4.35cm；R₂＝4.8cm； R₃＝6.2cm；R₄＝6.7cm；R₅＝7.25cm；R₆＝8.4cm；

The grouting pump numerical value of the present embodiment is calculated as:

1. three-dimensional modeling and meshing

As shown in fig. 10, the schematic diagram of plunger pump fluid domain meshing is obtained, and in order to obtain the pressure change of the plunger pump plunger flow domain, the ANSYS Fluent software is used to perform numerical simulation on the pressure change. The main work is as follows: firstly, respectively modeling a plunger fluid domain part by utilizing SolidWorks software, then respectively carrying out grid division on the plunger fluid domain part in ICEM CFD, and finally introducing the grid into ANSYS Fluent to carry out numerical calculation.

2. Overlapping grid method

In Fluent, an overlapping grid can be used for two-dimensional and three-dimensional models, for reciprocating, rotational, and irregular motions. The method can well describe the movement of the component, can ensure the grid quality of the component in the movement process, and can be well suitable for the movement and the internal flow field of the plunger pump plunger flow field. The plunger fluid field is necessarily simplified in order to better apply the method for numerical calculation and discussion of the internal flow field. The simplified results are shown in FIG. 11, which is a simplified grid and cross-sectional view of the plunger.

3. Calculation results and analysis

As a result of the calculation, as shown in fig. 12, when the plunger moves to the maximum stroke, the negative pressure in the upper part of the plunger flow field increases, and the positive pressure in the lower part increases, so that the fluid (slurry) is normally discharged. The outlet pressure fluctuation variation graph is shown in FIG. 13.

As shown in fig. 14, the turbulent kinetic energy inside the plunger is uniformly distributed in the lower flow area of the plunger, i.e. the flow state of the fluid (slurry) is relatively uniform and stable under the physical characteristics of the fluid (density 2590kg/m 3).

The analysis shows that the flow state and the pressure distribution in the plunger fluid area of the plunger pump basically meet the design requirements, but the analysis of the plunger fluid area is a simplified single plunger dynamic analysis, and certain deviation exists between the analysis and the real flow state and the pressure distribution, namely certain pressure pulsation and fluid movement distribution unevenness exist in the movement of a single plunger, and the deviation needs to be further corrected.

The grouting pump of the embodiment works as follows:

when the cylinder block drives the plunger piston to rotate, the plunger piston (1) is forced to do linear reciprocating motion in the plunger piston cavity because the inclined plane of the inclined plate has an inclined angle gamma relative to the cylinder block. When the cylinder body rotates, the plunger piston continuously extends from a bottom dead center (corresponding to a 180-degree position) within the range of 180-360 degrees, and the volume of the plunger piston cavity is continuously increased until a top dead center (corresponding to a 0-degree position). In the process, the plunger cavity is just communicated with the oil suction window of the port plate (3), oil is sucked into the plunger cavity, and the oil suction process is realized. Along with the continuous rotation of the cylinder body, the plunger piston continuously enters the cavity from the top dead center under the restraint of the swash plate within the range of 0-180 degrees, and the volume of the plunger piston cavity continuously decreases until the bottom dead center. In the process, the plunger cavity is just communicated with the oil discharge window of the port plate, and oil is discharged through the oil discharge window. This is the oil drainage process. Therefore, each plunger can absorb oil in half cycle and discharge oil in half cycle every cycle of the cylinder body. If the cylinder body rotates continuously, the pump continuously sucks oil and discharges oil.

The embodiment provides a specially designed grouting pump for a runway snow melting composite pipe, the pump is suitable for small flow and high lift, fluid has physical characteristics of high viscosity and large density, and the pump adopts a positive displacement reciprocating pump, utilizes periodic volume change in a working cavity to convey the fluid, and is suitable for conveying various media with small flow and high lift, such as various liquids with high viscosity, corrosiveness, flammability, explosiveness and the like. Conforming to the fluid (slurry) transport characteristics.

The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, the detailed description and the application scope of the embodiments according to the present invention may be changed by those skilled in the art, and in summary, the present disclosure should not be construed as limiting the present invention.