CN211598986U

CN211598986U - Double-screw pump capable of idle running for long time

Info

Publication number: CN211598986U
Application number: CN201922045953.0U
Authority: CN
Inventors: 陈威; 孙丽
Original assignee: Shanghai Shunzi Machinery Manufacturing Co ltd
Current assignee: Shanghai Shunzi Machinery Manufacturing Co ltd
Priority date: 2019-11-23
Filing date: 2019-11-23
Publication date: 2020-09-29
Anticipated expiration: 2029-11-23

Abstract

The utility model relates to a conveying equipment technical field discloses a can long-time idle running double screw pump, include the pump case and install at the inside conveying screw of pump case, the screw rod divide into entering cavity and output cavity with the pump case, be connected with auxiliary device on the pump case, auxiliary device includes input box and output box, input box and entering cavity UNICOM, output box and output cavity UNICOM let cooling medium can stop in input box and output box through input box and output box to cool down the pump, thereby when the idle running, can not appear high temperature and damage the pump, improved the idle running time of pump.

Description

Double-screw pump capable of idle running for long time

Technical Field

The utility model relates to a delivery pump technical field, more specifically say, it relates to a can long-time idle running's twin-screw pump.

Background

A pump is a machine that transports or pressurizes a fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pump is mainly used for conveying liquid such as water, oil, acid-base liquid, emulsion, suspension emulsion and liquid metal, and can also be used for conveying liquid, gas mixture and liquid containing suspended solid. Pumps can be generally classified by their operating principle into three types, positive displacement pumps, dynamic pumps and other types of pumps. In addition to classification by theory of operation, classification and naming may be by other methods. For example, the driving method may be classified into an electric pump, a turbine pump, and the like; can be divided into a single-stage pump and a multi-stage pump according to the structure; can be divided into a boiler feed pump, a metering pump and the like according to the application; the liquid can be divided into a water pump, an oil pump, a slurry pump and the like according to the property of the transported liquid. According to the structure with or without shaft, the linear pump and the traditional pump can be divided. The water pump can only convey material flow taking fluid as a medium, and can not convey solids.

Currently, pumps are capable of delivering fluid by pressure during use, and are also cooled by the fluid as it is being delivered, thereby allowing the pump to continue to operate. However, after the fluid is pumped, the pump may run idle, and during the idle, the pump may generate heat, thereby causing damage to the pump, and thus, it is required to improve the pump.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a can long-time idle running two-screw pump, it can let the long-time idle running of pump through auxiliary device.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a double-screw pump capable of running idle for a long time comprises a pump shell and a conveying screw installed inside the pump shell, wherein the pump shell is divided into an inlet cavity and an outlet cavity by the conveying screw, an auxiliary device is connected to the pump shell and comprises an input box body and an output box body, the input box body is communicated with the inlet cavity, the output box body is communicated with the outlet cavity, and a supplement assembly for conveying cooling media in the output box body into the input box body is arranged between the output box body and the input box body.

Through adopting above-mentioned technical scheme, the coolant that keeps in input box and output box to cool off conveying screw, thereby the twin-screw pump can carry out long-time idle running, has improved the practical life of twin-screw pump. Because the cooling medium of input box is generally all carried to the output box, consequently, the most time of the cooling medium in the input box is in the state of vacancy, lets the cooling medium in the output box return to the input box through setting up supplementary subassembly to further cool off the screw pump.

The utility model discloses further set up to: the input box body is provided with an inlet, the input box body is communicated with the inlet cavity through the inlet, and the inlet is higher than the bottom of the input box body.

The utility model discloses further set up to: the output box is provided with an output port, the output box and the output cavity are communicated through the output port, and the output port is higher than the bottom of the output box.

The utility model discloses further set up to: the bottom parts of the input box body and the output box body are provided with cleaning ports.

Through adopting above-mentioned technical scheme, the setting of inlet port and delivery outlet can let it be connected fixedly with the pump case, is higher than the bottom setting with it simultaneously, lets inside it can effectually prevent that impurity from entering into the pump, has improved the life of pump. In addition, a cleaning port is arranged at the bottom of the device, so that impurities can be removed.

The utility model discloses further set up to: the supplement component comprises a temporary storage box, a liquid supplement pipe respectively connected with the temporary storage box and the input box, and a liquid return pipe respectively connected with the output box and the temporary storage box.

Through adopting above-mentioned technical scheme, the case of keeping in passes through the liquid return pipe, lets the coolant in the output box enter into the case of keeping in, and input box is sent into with coolant to the rethread moisturizing pipe to let the coolant in the input box can last send the pump in, and then let the pump can cool off, let its idle running time that can effectively improve the pump.

The utility model discloses further set up to: and control valves are arranged on the liquid return pipe and the liquid supplementing pipe.

Through adopting above-mentioned technical scheme, liquid return pipe and fluid infusion pipe can be controlled in setting up of control valve to the stage that the cooling medium's of letting to the temporary storage case supplementary stage and cooling medium sent into the input box separates, and then lets the fluid infusion process can not too much influence the pump sending of whole pump.

The utility model discloses further set up to: the temporary storage box is provided with an extraction assembly, the extraction assembly comprises an extraction pipe arranged on the temporary storage box, a piston arranged in the extraction pipe and a power part used for driving the piston to move, and the extraction pipe is communicated with the temporary storage box.

Through adopting above-mentioned technical scheme, power spare promotes the piston interactive in the extraction pipe the inside, and then lets the extraction pipe let the case of keeping in negative pressure state to let the coolant in the output box can adsorb the case of keeping in.

The utility model discloses further set up to: and a communicating pipe for exhausting the extraction assembly is arranged between the temporary storage box and the output box body.

The utility model discloses further set up to: the supplementary subassembly includes the case of keeping in, installs return liquid pipe and benefit liquid pipe on the case of keeping in respectively, the case of keeping in includes box, lower box and is used for producing the middle box of deformation, return liquid pipe and last box connection, benefit liquid pipe and lower box connection.

The utility model discloses further set up to: the middle box body is formed by a corrugated structure, and an elastic piece is arranged between the upper box body and the lower box body.

Through adopting above-mentioned technical scheme, the wearing layer can let the screw rod when rotating, and reducing wear adopts wear-resisting rubber, and it can be when reducing wear, noise abatement in addition. In addition, polytetrafluoroethylene is used as a wear-resistant layer, and the polytetrafluoroethylene has relatively good self-lubricating property, so that friction can be reduced in the actual use process, and the rotation of the polytetrafluoroethylene is more convenient.

To sum up, the utility model discloses following beneficial effect has:

(1) through the input box body and the output box body, the cooling medium can stay in the input box body and the output box body, so that the pump is cooled, the pump is not damaged due to high temperature during idle running, and the idle running time of the pump is prolonged;

(2) through the temporary storage case through returning the liquid pipe, let the coolant in the output box enter into the temporary storage incasement, rethread moisturizing pipe sends into the input box with coolant to in letting the coolant in the input box can last the pump of sending to, and then let the pump can cool off, let its idle running time that can effectively improve the pump.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a schematic structural view of example 2;

fig. 4 is an enlarged view at B in fig. 3.

Reference numerals: 1. a pump housing; 11. entering a cavity; 12. an output cavity; 2. a screw; 21. a wear-resistant surface layer; 3. inputting the box body; 31. an inlet port; 4. an output box body; 41. an output port; 5. a supplementary component; 51. a temporary storage box; 511. an upper box body; 512. a lower box body; 513. a middle box body; 514. an elastic member; 52. a liquid return pipe; 53. a liquid supplementing pipe; 54. a control valve; 55. a communicating pipe; 56. a hose; 6. an extraction assembly; 61. an extraction pipe; 62. a piston; 63. a power member; 64. a short pipe; 7. and cleaning the opening.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Example 1: a double-screw pump capable of idle running for a long time is disclosed, as shown in figure 1, comprising a pump shell 1 and a screw 2 arranged in the pump shell 1, wherein the pump shell 1 is divided into an inlet cavity 11 and an outlet cavity 12 by the screw 2, and when the screw 2 rotates, a medium entering the cavity 11 is conveyed to the outlet cavity 12, so that the purpose of conveying the medium is achieved.

In the case where no medium is present or the medium is a gas during operation, a large amount of heat is easily generated by friction between the screw 2 and between the screw 2 and the pump housing 1, and an auxiliary device is provided outside the pump housing 1 in order to increase the idle operation time of the pump. As shown in fig. 1 and 2, the auxiliary device comprises an input housing 3 and an output housing 4, communicating the input housing 3 with an inlet chamber 11 and the output housing 4 with an outlet chamber 12. During the use, all be filled with in input box 3 and the output box 4 and carry out lubricated and refrigerated coolant for screw rod 2, when screw rod 2 rotated, cool off through medium and coolant to let screw rod 2 can last the operation and can not be because high temperature to the pump damage, when idle running, lubricating and cooling after entering into pump case 1 through the coolant in the auxiliary device, reduce the wearing and tearing of pump, improve its life. When a transport medium is present, the cooling medium is directly the transport medium, whereas when the transport medium is a gas, the cooling medium generally uses a liquid incompatible with the transport medium as the cooling medium.

As shown in fig. 1 and 2, the input box 3 is provided with an inlet 31, the output box 4 is provided with an outlet 41, and the inlet 31 and the outlet 41 are respectively connected with the housing, so that the input box 3 can enter the cavity 11 and the output box 4 is communicated with the output cavity 12. In the actual conveying process, impurities may exist in the conveying medium, so that the output port 41 is arranged higher than the bottom of the output box 4, and the inlet port 31 is arranged higher than the bottom of the inlet port 31, so that the impurities can stay at the bottom of the output box 4 or the input box 3. In order to conveniently remove impurities, cleaning ports 7 are arranged at the bottoms of the input box body 3 and the output box body 4, and the impurities are cleaned through the cleaning ports 7.

As shown in fig. 1 and 2, in addition, during the process of conveying the pump, the medium in the input box 3 is drawn into the output box 4, so that, during idle operation, air is finally drawn into the output box 4 and is output, after the medium is output, no cooling medium exists in the input box 3, and the pump body itself cannot be immersed in the cooled medium during the conveying process, so that the temperature of the pump body rises, and the pump body is damaged by high temperature, especially on the side of the input cavity. In order to solve the above-described problems, a replenishment module 5 for replenishing the cooling medium is connected to the input casing 3. After the pump has been idle for a certain time, the inlet tank 3 is filled with a cooling medium by means of the supplementary assembly 5, so that the part of the pump entering the chamber 11 is cooled. The outlet tank 4 is generally a cooling medium outlet portion, and therefore, a large amount of cooling medium exists in the outlet tank 4. In order to further use the cooling medium in the output box 4, the output box 4 is connected with the supplement component 5, so that the cooling medium in the output box 4 can enter the input box 3 through the supplement component 5 to perform a cooling function.

As shown in fig. 1 and 2, the replenishing assembly 5 includes a temporary storage tank 51, a liquid return pipe 52 for communicating the temporary storage tank 51 with the output tank 4, and a liquid replenishing pipe 53 for communicating the temporary storage tank 51 with the input tank 3, and returns the surplus cooling medium in the output tank 4 to the temporary storage tank 51 through the liquid return pipe 52, and replenishes the cooling medium in the temporary storage tank 51 to the input tank 3 through the liquid replenishing pipe 53. The liquid return pipe 52 has one end connected to the output box 4 near the bottom and the other end connected to the temporary storage box 51 near the top, and the liquid replenishing pipe 53 has one end connected to the temporary storage box 51 near the bottom and the other end connected to the input box 3 near the top. In order to prevent the direct communication between the input tank 3 and the output tank 4 and the pressure leakage during the pumping process, solenoid valves are provided as control valves 54 on the fluid infusion pipe 53 and the fluid return pipe 52 to isolate the direct communication between the two tanks.

In order to facilitate the supply of the cooling medium in the outlet box 4 to the temporary storage tank 51, an extraction unit 6 is installed in the temporary storage tank 51, and as shown in fig. 1 and 2, the liquid is extracted by the extraction unit 6, so that the cooling medium is temporarily stored in the temporary storage tank 51. In actual use, in both the process of drawing the cooling medium into the temporary storage tank 51 from the output tank 4 and the process of feeding the cooling medium in the temporary storage tank 51 into the input tank 3, the temporary storage tank 51 needs to be communicated with the corresponding tank, and the temporary storage tank 51 needs to be in a state of being capable of storing liquid, that is, the temporary storage tank 51 needs to be communicated with the outside, and when the communication is performed, the cooling medium is affected by the outside, and at the same time, the pump may be leaked.

In order to solve the above-mentioned problem, a communication pipe 55 is further provided between the temporary storage tank 51 and the output tank 4, and as shown in fig. 1 and 2, one end of the communication pipe 55 is provided at a position horizontally above the output tank 4, and the other end is provided at a position above the temporary storage tank 51. And a solenoid valve is provided as a control valve 54 on the communication pipe 55 to control on and off thereof, and when the cooling medium is stored, the solenoid valve is opened to communicate it, and the gas is discharged from the communication pipe 55 through the extraction assembly 6 and is closed when not extracted. Similarly, when the cooling medium is put into the input tank 3, the solenoid valve of the communication pipe 55 is also opened to communicate with it.

As shown in fig. 1 and 2, the air-extracting assembly includes an extracting pipe 61 installed on the temporary storage tank 51 and a piston 62 disposed in the extracting pipe 61, and the piston 62 is pulled by a power member 63 installed to allow the extracting pipe 61 to extract the air in the temporary storage tank 51. A short pipe 64 is connected between the suction pipe 61 and the temporary storage tank 51, and the short pipe 64 is connected to the communication pipe 55. The power member 63 may be formed by a cylinder or a motor, and when the motor is used, the rotation is converted into the movement of the reciprocating piston 62 through a four-bar linkage mechanism.

As shown in fig. 1, a wear-resistant surface layer 21 is provided on the surface of the screw 2, and the heat generated by friction is reduced by the wear-resistant surface layer 21, and it is generally made of wear-resistant rubber. Further, since the friction coefficient and the lubrication coefficient of the surface of the screw 2 are factors that cause heat generation on the surface of the screw 2 during the friction of the screw 2, a surface layer having a high lubrication ratio is provided on the surface of the screw 2 in order to reduce the amount of heat generated during the rotation of the screw. In order to improve the wear resistance and the lubrication at the same time, a polytetrafluoroethylene layer can be arranged on the surface layer of the screw rod 2. It can all set up the polytetrafluoroethylene layer with two screw rods 2 on its surface, can be its one screw rod 2 for the polytetrafluoroethylene layer, another with adopting the ceramic top layer.

Example 2: a twin-screw 2 pump capable of long-time idle operation is substantially the same as that of embodiment 1, and is different from embodiment 1 in that a replenishing unit 5 is provided, and in embodiment 2, as shown in FIGS. 3 and 4, the replenishing unit 5 includes a temporary storage tank 51, a liquid return pipe 52 and a liquid replenishing pipe 53 which are respectively installed on the temporary storage tank 51, wherein the liquid return pipe 52 communicates with the output tank 4 and the temporary storage tank 51, and the liquid replenishing pipe 53 communicates with the input tank 3 and the temporary storage tank 51. One end of the liquid return pipe 52 connected to the output box 4 is disposed near the bottom of the output box 4, and the other end is communicated with the side of the temporary storage box 51 that is horizontally high. The liquid-replenishing pipe 53 has one end connected to the position near the bottom of the temporary storage tank 51 and the other end connected to the end of the input box 3 having a higher horizontal position. Solenoid valves are installed on the liquid return pipe 52 and the liquid supplementing pipe 53 as control valves 54 to control whether the liquid return pipe 52 is communicated with the liquid supplementing pipe 53.

In order to facilitate the return of the cooling medium, the temporary storage tank 51 is configured to have a deformation capability, and as shown in fig. 3 and 4, the temporary storage tank includes an upper tank 511, a lower tank 512, and a middle tank 513 connecting the upper tank 511 and the lower tank 512, wherein the middle tank 513 is formed by a rubber or plastic sleeve having a corrugated structure, the liquid return pipe 52 is connected to the upper tank 511, and the liquid replenishing pipe 53 is connected to the lower tank 512. When the liquid replenishing device is used, the liquid replenishing pipe 53 is in a communicated state and the liquid returning pipe 52 is in a closed state, the cooling medium in the temporary storage tank 51 is replenished into the input tank 3 under the action of the adsorption force of the input tank 3, at the moment, the middle tank 513 is deformed, and when the intermediate tank is deformed, the upper tank 511 is subjected to position change, and then a hose 56 or a corrugated pipe, shown as a hose 56, is arranged between the liquid returning pipe 52 and the upper tank 511, so that the upper tank 511 is convenient to move. After the liquid supplement is completed, the liquid return pipe 52 is closed at this time, the liquid supplement pipe 53 is in a communicating state, and the intermediate box 513 has an adsorption force on the liquid return pipe 52 in a restoring force state existing in the structure thereof, so that the cooling medium in the output box 4 is extracted into the temporary storage box 51. In the process, the cooling medium can be circulated through the adsorption force of the screw 2 pump, and in addition, the cooling medium is supplemented in a segmented manner, so that the input box body 3 and the output box body 4 are always in an isolated state, and the influence of the cooling medium on the working efficiency of the pump is reduced. In order to further improve the adsorption and return capabilities of the intermediate case 513, an elastic member 514 is provided between the upper case 511 and the lower case 512, and the elastic member 514 is formed of a spring and is directly returned by the spring.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The double-screw pump capable of running idle for a long time comprises a pump shell (1) and a conveying screw (2) installed inside the pump shell (1), and is characterized in that the screw (2) divides the pump shell (1) into an inlet cavity (11) and an outlet cavity (12), an auxiliary device is connected to the pump shell (1) and comprises an input box body (3) and an output box body (4), the input box body (3) is communicated with the inlet cavity (11), the output box body (4) is communicated with the outlet cavity (12), and a supplement assembly (5) for conveying a cooling medium in the output box body (4) into the input box body (3) is arranged between the output box body (4) and the input box body (3).

2. Double screw pump capable of long idle running according to claim 1, characterized in that the inlet box (3) is provided with an inlet opening (31), the inlet box (3) is communicated with the inlet cavity (11) through the inlet opening (31), and the inlet opening (31) is arranged higher than the bottom of the inlet box (3).

3. The twin-screw pump capable of idling for a long time according to claim 1, characterized in that an output port (41) is provided on the output box body (4), the output box body (4) is communicated with the output cavity (12) through the output port (41), and the output port (41) is provided higher than the bottom of the output box body (4).

4. Twin-screw pump capable of long idle running according to claim 1, characterised in that the input tank (3) and the output tank (4) are provided with cleaning ports (7) at their bottom.

5. Twin-screw pump capable of long idle operation according to claim 1, characterised in that the supplementary assembly (5) comprises a temporary storage tank (51), a fluid replenishment pipe (53) connected to the temporary storage tank (51) and the inlet tank (3), respectively, and a fluid return pipe (52) connected to the outlet tank (4) and the temporary storage tank (51), respectively.

6. Twin-screw pump capable of long idle operation according to claim 5, characterised in that the return pipe (52) and the return pipe (53) are provided with control valves (54).

7. Double-screw pump capable of run-flat for extended periods of time according to claim 6, characterised in that the temporary storage tank (51) is fitted with an extraction assembly (6), the extraction assembly (6) comprising an extraction pipe (61) fitted to the temporary storage tank (51), a piston (62) placed inside the extraction pipe (61) and a power element (63) for driving the piston (62) to move, the extraction pipe (61) communicating with the temporary storage tank (51).

8. Twin-screw pump capable of long idle operation according to claim 7, characterised in that a communication duct (55) for the evacuation of the extraction assembly (6) is provided between the temporary storage tank (51) and the outlet tank (4).

9. Double-screw pump capable of idling for long periods according to claim 1, characterized in that the supplementary assembly (5) comprises a temporary storage tank (51), a liquid return pipe (52) and a liquid supplement pipe (53) which are respectively installed on the temporary storage tank (51), the temporary storage tank (51) comprises an upper tank body (511), a lower tank body (512) and a middle tank body (513) for generating deformation, the liquid return pipe (52) is connected with the upper tank body (511), and the liquid supplement pipe (53) is connected with the lower tank body (512).

10. Twin-screw pump capable of long idle operation according to claim 9, characterised in that the intermediate casing (513) is of corrugated construction and that an elastic element (514) is provided between the upper casing (511) and the lower casing (512).