A twin-screw pump capable of long-term idling

Abstract

The present invention relates to the technical field of conveying equipment, and discloses a twin-screw pump capable of long-term idling, comprising a pump casing and a conveying screw installed inside the pump casing, wherein the screw divides the pump casing into an inlet cavity and an output cavity, and an auxiliary device is connected to the pump casing, wherein the auxiliary device comprises an input box and an output box, wherein the input box is connected to the inlet cavity, and the output box is connected to the output cavity, and a cooling medium can stay in the input box and the output box through the input box and the output box, thereby cooling the pump, so that when the pump is idling, high temperature will not occur to damage the pump, thereby increasing the idling time of the pump.

Description

Technical Field

[0001] The invention relates to the technical field of delivery pumps, and more particularly to a twin-screw pump capable of long-term idling operation. Background Art

[0002] A pump is a machine that transports fluids or pressurizes fluids. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. Pumps are mainly used to transport liquids such as water, oil, acid and alkali liquids, emulsions, suspensions and liquid metals. They can also transport liquid-gas mixtures and liquids containing suspended solids. Pumps can usually be divided into three categories according to their working principles: positive displacement pumps, dynamic pumps and other types of pumps. In addition to classification by working principle, they can also be classified and named according to other methods. For example, according to the driving method, they can be divided into electric pumps and water turbine pumps; according to the structure, they can be divided into single-stage pumps and multi-stage pumps; according to the purpose, they can be divided into boiler feed pumps and metering pumps; according to the nature of the transported liquid, they can be divided into water pumps, oil pumps and mud pumps. According to the presence or absence of an axis structure, they can be divided into linear pumps and traditional pumps. Water pumps can only transport logistics with fluids as the medium, and cannot transport solids.

[0003] At present, when the pump is in use, it can transfer the fluid through pressure. When transferring the fluid, the pump will also be cooled by the fluid, so that the pump can continue to operate. After the fluid is pumped, the pump will run idle, and when running idle, the pump will heat up, which will cause damage to the pump, so it needs to be improved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a twin-screw pump capable of long-term idling, which can allow the pump to run idling for a long time through an auxiliary device.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A twin-screw pump capable of long-term idling comprises a pump casing and a conveying screw installed inside the pump casing, the screw dividing the pump casing into an inlet cavity and an output cavity, an auxiliary device connected to the pump casing, the auxiliary device comprising an input box and an output box, the input box being connected to the inlet cavity, the output box being connected to the output cavity, and a supplementary component for delivering the cooling medium in the output box to the input box being arranged between the output box and the input box.

[0007] By adopting the above technical solution, the cooling medium is temporarily stored in the input box and the output box, thereby cooling the conveying screw, so that the twin-screw pump can be operated idle for a long time, thereby increasing the practical life of the twin-screw pump. Since the cooling medium in the input box is generally transported to the output box, the cooling medium in the input box is in a vacant state most of the time. By setting a supplementary component, the cooling medium in the output box is sent back to the input box, thereby further cooling the screw pump.

[0008] The present invention is further configured as follows: an entry port is provided on the input box, the input box is connected to the entry cavity through the entry port, and the entry port is arranged higher than the bottom of the input box.

[0009] The present invention is further configured as follows: an output port is provided on the output box, the output box is connected to the output cavity through the output port, and the output port is arranged higher than the bottom of the output box.

[0010] The present invention is further configured as follows: cleaning ports are provided at the bottoms of the input box and the output box.

[0011] By adopting the above technical solution, the inlet and outlet are arranged so that they can be connected and fixed to the pump housing, and at the same time, they are arranged above the bottom, so that impurities can be effectively prevented from entering the pump, thereby increasing the service life of the pump. In addition, a cleaning port is arranged at the bottom so that impurities can be removed.

[0012] The present invention is further configured as follows: the supplementary component includes a temporary storage box, a liquid replenishing pipe connected to the temporary storage box and the input box body respectively, and a liquid return pipe connected to the output box body and the temporary storage box respectively.

[0013] By adopting the above technical solution, the temporary storage box allows the cooling medium in the output box to enter the temporary storage box through the return pipe, and then sends the cooling medium to the input box through the replenishment pipe, so that the cooling medium in the input box can be continuously sent to the pump, thereby allowing the pump to be cooled, so that it can effectively increase the idle running time of the pump.

[0014] The present invention is further configured such that: control valves are provided on both the liquid return pipe and the liquid replenishment pipe.

[0015] By adopting the above technical solution, the setting of the control valve can control the return pipe and the replenishment pipe, thereby separating the stage of replenishing the cooling medium in the temporary storage box and the stage of delivering the cooling medium into the input box, so that the replenishment process will not affect the pumping of the entire pump too much.

[0016] The present invention is further configured as follows: an extraction assembly is installed on the temporary storage box, the extraction assembly includes an extraction pipe installed on the temporary storage box, a piston placed in the extraction pipe and a power part for driving the piston to move, and the extraction pipe is connected to the temporary storage box.

[0017] By adopting the above technical solution, the power component pushes the piston to interact inside the extraction tube, so that the extraction tube puts the temporary storage box in a negative pressure state, so that the cooling medium in the output box can be adsorbed into the temporary storage box.

[0018] The present invention is further configured such that a connecting pipe for exhausting the exhaust of the extraction component is provided between the temporary storage box and the output box body.

[0019] The present invention is further configured as follows: the replenishing component includes a temporary storage box, a liquid return pipe and a liquid replenishing pipe respectively installed on the temporary storage box, the temporary storage box includes an upper box body, a lower box body and an intermediate box body for generating deformation, the liquid return pipe is connected to the upper box body, and the liquid replenishing pipe is connected to the lower box body.

[0020] The present invention is further configured as follows: the middle box body is formed by a corrugated structure, and an elastic member is arranged between the upper box body and the lower box body.

[0021] By adopting the above technical solution, the wear-resistant layer can reduce the wear of the screw when it rotates. In addition, the wear-resistant rubber can reduce the wear and noise. In addition, polytetrafluoroethylene is used as the wear-resistant layer. Polytetrafluoroethylene itself has good self-lubricating properties, which can reduce friction during actual use and make it easier to rotate.

[0022] In summary, the present invention has the following beneficial effects:

[0023] (1) The cooling medium can stay in the input box and the output box through the input box and the output box, thereby cooling the pump. When the pump is running idle, high temperature will not occur and the pump will not be damaged, thus increasing the idle running time of the pump;

[0024] (2) The cooling medium in the output box is allowed to enter the temporary storage box through the return pipe, and then sent to the input box through the replenishment pipe, so that the cooling medium in the input box can be continuously sent to the pump, thereby cooling the pump and effectively increasing the idle running time of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of Example 1;

[0026] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0027] Figure 3 It is a structural schematic diagram of Example 2;

[0028] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0029] Figure numerals: 1. Pump casing; 11. Inlet cavity; 12. Output cavity; 2. Screw; 21. Wear-resistant surface layer; 3. Input box; 31. Inlet port; 4. Output box; 41. Output port; 5. Supplementary component; 51. Temporary storage box; 511. Upper box; 512. Lower box; 513. Middle box; 514. Elastic part; 52. Return pipe; 53. Liquid replenishment pipe; 54. Control valve; 55. Connecting pipe; 56. Hose; 6. Extraction component; 61. Extraction pipe; 62. Piston; 63. Power part; 64. Short pipe; 7. Cleaning port. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1: A twin-screw pump capable of long-term idling operation, such as Figure 1 As shown, it includes a pump housing 1 and a screw 2 installed inside the pump housing 1. The pump housing 1 is divided into an inlet cavity 11 and an outlet cavity 12 by the screw 2. When the screw 2 rotates, the medium entering the cavity 11 is sent to the outlet cavity 12, thereby achieving the purpose of conveying the medium.

[0032] During operation, when the medium does not exist or the medium is gas, a large amount of heat is easily generated due to friction between the screws 2 and between the screws 2 and the pump housing 1. In order to increase the idle running time of the pump, an auxiliary device is provided outside the pump housing 1. Figure 1 and Figure 2 As shown, the auxiliary device includes an input box 3 and an output box 4, which connect the input box 3 with the inlet cavity 11, and connect the output box 4 with the output cavity 12. When in use, the input box 3 and the output box 4 are filled with a cooling medium for lubricating and cooling the screw 2. When the screw 2 rotates, it is cooled by the medium and the cooling medium, so that the screw 2 can continue to operate without damaging the pump due to high temperature. When idling, the cooling medium in the auxiliary device enters the pump housing 1 for lubrication and cooling, reducing the wear of the pump and increasing its service life. When there is a conveying medium, the cooling medium is directly the conveying medium, and when the conveying medium is a gas, the cooling medium generally uses a liquid that is incompatible with the conveying medium as the cooling medium.

[0033] like Figure 1 and Figure 2As shown, the input box 3 is provided with an inlet 31, and the output box 4 is provided with an output port 41, and the inlet 31 and the output port 41 are respectively connected to the shell, so that the input box 3 can enter the cavity 11 and communicate, and the output box 4 is connected to the output cavity 12. In the actual conveying process, there may be impurities in the conveying medium, so the output port 41 is set higher than the bottom of the output box 4, and the inlet 31 is set higher than the bottom of the inlet 31, so that the impurities can stay on the bottom of the output box 4 or the input box 3. In order to remove impurities conveniently, a cleaning port 7 is set at the bottom of the input box 3 and the output box 4, and the impurities are cleaned through the cleaning port 7.

[0034] like Figure 1 and Figure 2 As shown, in addition, during the pump delivery process, the medium in the input box 3 will be extracted into the output box 4. Therefore, during idling, air is finally extracted into the output box 4 and the air is output. After the medium is output, there is no cooling medium in the input box 3, and the pump body itself will not be immersed in the cooling medium during the delivery process. Therefore, its temperature will rise, causing the pump body to burn out at high temperature, especially on the side of the input cavity. In order to solve the above technical problems, a supplementary component 5 for supplementing the cooling medium is connected to the input box 3. After the pump is idling for a certain period of time, the cooling medium is filled into the input box 3 through the supplementary component 5, so that the part of the pump entering the cavity 11 is cooled. The output box 4 is generally the cooling medium output part, so there is a large amount of cooling medium in the output box 4. In order to allow the cooling medium in the output box 4 to be further used, the output box 4 is connected to the supplementary component 5, so that the cooling medium in the output box 4 can enter the input box 3 through the supplementary component 5 to play a cooling role.

[0035] like Figure 1 and Figure 2 As shown, the replenishing assembly 5 includes a temporary storage box 51, a liquid return pipe 52 for connecting the temporary storage box 51 and the output box 4, and a liquid replenishment pipe 53 for connecting the temporary storage box 51 and the input box 3. The excess cooling medium in the output box 4 is sent back to the temporary storage box 51 through the liquid return pipe 52, and the cooling medium in the temporary storage box 51 is replenished into the input box 3 through the liquid replenishment pipe 53. One end of the liquid return pipe 52 is connected to the bottom position of the output box 4, and the other end is connected to the top position of the temporary storage box 51, while one end of the liquid replenishment pipe 53 is connected to the bottom position of the temporary storage box 51, and the other end is connected to the top position of the input box 3. When in use, in order to prevent the input box 3 and the output box 4 from being directly connected to each other and causing pressure leakage during the pumping process, solenoid valves are provided on the liquid replenishment pipe 53 and the liquid return pipe 52 as control valves 54 to isolate the direct connection between the two boxes.

[0036] In order to facilitate the delivery of the cooling medium in the output box 4 to the temporary storage box 51, an extraction component 6 is installed on the temporary storage box 51. Figure 1 and Figure 2 As shown, the liquid is pumped up by the extraction assembly 6, so that the cooling medium is temporarily stored in the temporary storage box 51. In actual use, in the process of pumping the cooling medium from the output box 4 into the temporary storage box 51 and in the process of sending the cooling medium in the temporary storage box 51 to the input box 3, in both processes, the temporary storage box 51 needs to be connected to the corresponding box, and the temporary storage box 51 needs to be in a state where the liquid can be stored, that is, the temporary storage box 51 needs to be connected to the outside world, and when connected, the cooling medium will be affected by the outside world, and at the same time, the pump may leak.

[0037] In order to solve the above technical problems, a connecting pipe 55 is further provided between the temporary storage box 51 and the output box body 4. Figure 1 and Figure 2 As shown, one end of the connecting pipe 55 is arranged at a position above the output box 4, and the other end is arranged at a position above the temporary storage box 51. And a solenoid valve is arranged on the connecting pipe 55 as a control valve 54 to control its on and off. When the cooling medium is stored, the solenoid valve is opened to make it connected, and the gas is discharged from the connecting pipe 55 through the extraction component 6, and is closed when it is not extracted. Similarly, when the cooling medium is placed in the input box 3, the solenoid valve of the connecting pipe 55 is also opened to make it connected.

[0038] like Figure 1 and Figure 2 As shown, the air extraction assembly includes an extraction pipe 61 installed on the temporary storage box 51 and a piston 62 in the extraction pipe 61. The piston 62 is pulled by installing a power member 63, so that the extraction pipe 61 can extract the air in the temporary storage box 51. A short pipe 64 is connected between the extraction pipe 61 and the temporary storage box 51, and the connecting pipe 55 is connected to the short pipe 64. The power member 63 can be composed of a cylinder or a motor. When a motor is used, a four-bar linkage is required to realize the conversion of rotation into reciprocating motion of the piston 62.

[0039] like Figure 1 As shown, a wear-resistant surface layer 21 is provided on the surface of the screw 2, and the wear-resistant surface layer 21 can reduce the heat generated by friction. The wear-resistant surface layer 21 can generally be made of wear-resistant rubber. In addition, during the friction of the screw 2, the friction coefficient and lubrication coefficient of its surface are the main reasons for the heat generation on the surface of the screw 2. Therefore, in order to reduce the heat generated by the screw 2 during the rotation process, a surface layer with a high lubricity ratio is provided on its surface. In order to improve its wear resistance and lubrication at the same time, a polytetrafluoroethylene layer can be provided on the surface of the screw 2. It is possible to provide polytetrafluoroethylene layers on the surfaces of both screws 2, and one of the screws 2 can be a polytetrafluoroethylene layer, and the other can be a ceramic surface layer.

[0040] Embodiment 2: A twin-screw pump capable of long-term idling operation, the general structure of which is the same as that of Embodiment 1, except that the supplementary component 5 is arranged. Figure 3 and Figure 4 As shown, the replenishing component 5 includes a temporary storage box 51, a return pipe 52 and a replenishment pipe 53 respectively installed on the temporary storage box 51, wherein the return pipe 52 connects the output box 4 and the temporary storage box 51, and the replenishment pipe 53 connects the input box 3 and the temporary storage box 51. One end of the return pipe 52 connected to the output box 4 is arranged near the bottom of the output box 4, and the other end is connected to the side of the temporary storage box 51 with a higher horizontal position. One end of the replenishment pipe 53 is connected to the temporary storage box 51 near the bottom, and the other end is connected to the end of the input box 3 with a higher horizontal position. Solenoid valves are installed on the return pipe 52 and the replenishment pipe 53 as control valves 54 to control whether the return pipe 52 and the replenishment pipe 53 are connected.

[0041] In order to facilitate the reflux of the cooling medium, the temporary storage box 51 is configured to have a deformable structure, such as Figure 3 and Figure 4 As shown, it includes an upper box body 511, a lower box body 512, and an intermediate box body 513 connecting the upper box body 511 and the lower box body 512, wherein the intermediate box body 513 is formed by a corrugated rubber or plastic sleeve, the return pipe 52 is connected to the upper box body 511, and the liquid replenishment pipe 53 is connected to the lower box body 512. When in use, when replenishing liquid, the liquid replenishment pipe 53 is in a connected state, and the return pipe 52 is in a closed state. Under the action of the adsorption force of the input box body 3, the cooling medium in the temporary storage box 51 is replenished into the input box body 3. At this time, the intermediate box body 513 is deformed, and when the deformation occurs, the upper box body 511 changes position, and then a hose 56 or a corrugated pipe is arranged between the return pipe 52 and the upper box body 511, and the hose 56 is shown in the figure, so that the upper box body 511 can move more conveniently. After the rehydration is completed, the return liquid pipe 52 is closed, and the rehydration pipe 53 is in a connected state. The intermediate box 513 has an adsorption force on the return liquid pipe 52 under the restoring force state of its own structure, so that the cooling medium in the output box 4 is extracted into the temporary storage box 51. In this process, the cooling medium can circulate through the adsorption force of the screw 2 pump itself. In addition, by replenishing the cooling medium in sections, the input box 3 and the output box 4 are always in an isolated state, thereby reducing its impact on the working efficiency of the pump. In order to further improve the adsorption and reset ability of the intermediate box 513, an elastic member 514 is set between the upper box 511 and the lower box 512. The elastic member 514 is composed of a spring and is directly reset by the spring.

[0042] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A twin-screw pump capable of long-term idling operation, comprising a pump housing (1) and a screw (2) installed inside the pump housing (1), characterized in that: The screw (2) divides the pump housing (1) into an inlet cavity (11) and an outlet cavity (12); an auxiliary device is connected to the pump housing (1), the auxiliary device comprising an input box (3) and an output box (4); the input box (3) is connected to the inlet cavity (11); the output box (4) is connected to the output cavity (12); a supplementary component (5) is provided between the output box (4) and the input box (3) for delivering the cooling medium in the output box (4) to the input box (3); The replenishing assembly (5) comprises a temporary storage box (51), a liquid return pipe (52) and a liquid replenishing pipe (53) respectively mounted on the temporary storage box (51); the temporary storage box (51) comprises an upper box body (511), a lower box body (512) and an intermediate box body (513) for generating deformation; the liquid return pipe (52) is connected to the upper box body (511), and the liquid replenishing pipe (53) is connected to the lower box body (512); The liquid return pipe (52) and the liquid replenishment pipe (53) are both provided with a control valve (54); The liquid return pipe (52) returns the excess cooling medium in the output box (4) to the temporary storage box (51), and the liquid replenishment pipe (53) replenishes the cooling medium in the temporary storage box (51) into the input box (3); The middle box body (513) is formed of a corrugated structure, and an elastic member (514) is provided between the upper box body (511) and the lower box body (512).

2. The twin-screw pump capable of long-term idling according to claim 1, characterized in that: The input box (3) is provided with an inlet (31), the input box (3) is connected to the entry cavity (11) via the inlet (31), and the inlet (31) is arranged higher than the bottom of the input box (3).

3. The twin-screw pump capable of long-term idling according to claim 1, characterized in that: The output box (4) is provided with an output port (41), the output box (4) is connected to the output cavity (12) via the output port (41), and the output port (41) is arranged higher than the bottom of the output box (4).

4. The twin-screw pump capable of long-term idling according to claim 1, characterized in that: The bottom of the input box (3) and the output box (4) are provided with a cleaning port (7).

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