High-pressure single-stage pump structure

Abstract

The utility model discloses a high-pressure single-stage pump structure, and relates to the field of single-stage pumps, the high-pressure single-stage pump structure comprises a single-stage pump body, one end of the single-stage pump body is provided with a connecting port, an impeller is arranged in the single-stage pump body, the top end of the impeller is provided with a guide bearing, and the top end of the guide bearing is provided with a shaft sleeve assembly; the top end of the shaft sleeve assembly abuts against the bottom end of the pump cover assembly, and the pump cover assembly is installed at the top end of the single-stage pump body. According to the single-stage pump, the first friction pair and the second friction pair are utilized and matched with the pump cover assembly, so that shaft head thrust generated by the single-stage pump body when the inlet pressure of the connecting port is large is transmitted to the pump cover assembly through the shaft sleeve body and then transmitted to a base arranged at the bottom end of the single-stage pump body through the pump cover assembly; and meanwhile, due to the mode, the effect of stabilizing the device can be achieved in the using process, and the service life of the mechanical sealing piece and the service life of the guide bearing can be effectively prolonged.

Description

[0001] A high-pressure single-stage pump structure Technical Field

[0002] The present application relates to the field of single-stage pumps, and in particular to a high-pressure single-stage pump structure. Background Art

[0003] A single-stage pump is a single-stage centrifugal pump, which is mainly composed of a pump body, a pump cover, an electric motor, a pump shaft, a bearing seat, an impeller, a mechanical seal and a mechanical seal cover. It is mainly suitable for industrial and agricultural, urban, drainage, fire protection and water supply, etc. The existing single-stage pumps can basically meet daily use needs.

[0004] After searching, a Chinese patent document discloses a high-pressure single-stage pump (publication number: CN210343714U), but it still has the following defects:

[0005] Although the above-mentioned high-pressure single-stage pump achieves balance of large axial force by adding a balance drum and two angular contact ball bearings to the impeller, so that the single-stage single-suction series pump can also complete the transportation of high-pressure medium, it still has the problem that when the pump inlet is too large due to changes in the working environment, the axial force acting on the shaft head will increase with the increase of the pump inlet pressure. This axial force further acts on the mechanical seal and bearing, greatly reducing the service life of the mechanical seal and bearing. Utility Model Content

[0006] In order to solve the problem in the background technology that the axial force further acts on the mechanical seal and the bearing, which greatly reduces the service life of the mechanical seal and the bearing, the present application provides a high-pressure single-stage pump structure.

[0007] The present application provides a high-pressure single-stage pump structure that adopts the following technical solutions:

[0008] A high-pressure single-stage pump structure includes a single-stage pump body, a connection port is provided at one end of the single-stage pump body, an impeller is provided inside the single-stage pump body, a guide bearing is installed at the top end of the impeller, and a shaft sleeve assembly is installed at the top end of the guide bearing, the top end of the shaft sleeve assembly conflicts with the bottom end of the pump cover assembly, and the pump cover assembly is installed at the top end of the single-stage pump body.

[0009] By adopting the above technical solution and arranging the impeller, the impeller is driven by the linkage force of the guide bearing and rotates, thereby realizing the operation of the single-stage pump body.

[0010] Preferably, the sleeve assembly includes a sleeve body, a first connecting cavity and a first friction pair, the bottom end of the sleeve body is connected to the top end of the guide bearing, and the first connecting cavity is opened through the top end of the sleeve body, and the first friction pair is provided on both sides of the sleeve body.

[0011] By adopting the above technical solution and providing the shaft sleeve assembly, the shaft sleeve assembly cooperates with the pump cover assembly, thereby stabilizing the device.

[0012] Preferably, the sleeve body is arranged in a cross-shaped structure, the first friction pair is arranged at the top end of the transverse surface of the sleeve body, and the first friction pair is arranged in a circular ring structure.

[0013] By adopting the above technical solution and providing the first friction pair, the first friction pair can play a stabilizing role for the device during its movement and in cooperation with the second friction pair.

[0014] Preferably, the pump cover assembly includes a pump cover body, a second connecting cavity and a second friction pair. The bottom end of the pump cover body abuts against the top of the shaft sleeve assembly, and a second connecting cavity is opened through the top of the pump cover body. The second friction pair is installed on the inner side wall of the first friction pair.

[0015] By adopting the above technical solution and providing the pump cover assembly, during use, the medium passes between the second friction pair and the first friction pair, thereby achieving the function of lubricating and cooling the second friction pair and the first friction pair.

[0016] Preferably, the second friction pair is arranged in a circular ring structure, and the bottom end of the pump cover body is connected to the top end of the single-stage pump body.

[0017] By adopting the above technical solution and providing the second friction pair, the second friction pair cooperates with the first friction pair during use to achieve the functions of stabilization, lubrication and cooling.

[0018] Preferably, a mechanical seal is installed on the top end of the pump cover assembly, and a mechanical seal exhaust pipe is installed on one end of the mechanical seal.

[0019] By adopting the above technical solution and providing a mechanically sealed exhaust pipe, the medium can be transmitted to a sewage discharge system or other low-pressure treatment system through the mechanically sealed exhaust pipe.

[0020] Preferably, a first groove is provided at the bottom end of the mechanical seal, and a second groove is provided at the bottom end of the first groove. The second groove is provided at the top end of the pump cover body, and a mechanical seal chamber is formed between the first groove and the second groove.

[0021] By adopting the above technical solution, the mechanically sealed chamber stores and transmits the medium generated during use.

[0022] Preferably, an output assembly is installed through the top end of the mechanical seal, and the output end of the output assembly extends into the interior of the first connecting cavity and the second connecting cavity and is connected to the top end of the guide bearing.

[0023] By adopting the above technical solution and setting up an output component, the output operation of the output component is transmitted to the impeller in conjunction with the guide bearing, so that the impeller rotates, and the operation of the single-stage pump body is realized through the impeller.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By utilizing the first friction pair and the second friction pair, in conjunction with the pump cover assembly, the shaft head thrust generated by the single-stage pump body when the inlet pressure of the connection port is high is transmitted to the pump cover assembly through the shaft sleeve body, and then transmitted to the base provided at the bottom end of the single-stage pump body through the pump cover assembly, thereby achieving the axial force transmission caused. At the same time, this method can stabilize the device during use, effectively prolong the service life of the mechanical seal and the guide bearing, thereby improving the practicality and stability of the device.

[0026] 2. With the help of the first friction pair and the second friction pair, the medium passes between the second friction pair and the first friction pair, thereby achieving the functions of lubricating and cooling the second friction pair and the first friction pair, and the medium is throttled and depressurized twice through the guide bearing and the second friction pair and the first friction pair, so that the pressure in the mechanical seal chamber is lower and the medium loss is smaller, thereby improving the practicality and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the combined parts of the shaft sleeve assembly of the utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the combined parts of the pump cover assembly in the present utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the combined parts of the shaft sleeve body, the first friction pair, the pump cover body and the second friction pair in the utility model.

[0031] Reference numerals: 1, single-stage pump body; 2, connection port; 3, impeller; 4, guide bearing;

[0032] 5. Shaft sleeve assembly; 501. Shaft sleeve body; 502. First connecting cavity; 503. First friction pair;

[0033] 6. Pump cover assembly; 601. Pump cover body; 602. Second connecting chamber; 603. Second friction pair; 7. Mechanical seal; 8. Mechanical seal exhaust pipe; 9. Output assembly. DETAILED DESCRIPTION

[0034] like Figures 1 to 4 As shown, the utility model provides a single-stage pump structure for high pressure, including a single-stage pump body 1, one end of the single-stage pump body 1 is fixedly connected to a connection port 2, and the interior of the single-stage pump body 1 is horizontally movably connected to an impeller 3, the top end of the impeller 3 is fixedly connected to the bottom end of a guide bearing 4, the top end of the guide bearing 4 is fixedly connected to a sleeve assembly 5 located inside the single-stage pump body 1, the sleeve assembly 5 includes a sleeve body 501, a first connecting cavity 502 and a first friction pair 503, and the bottom end of the sleeve body 501 with a cross-shaped structure is fixedly connected to the guide bearing 4, the interior of the sleeve body 501 is provided with a first connecting cavity 502, and the outer side wall of the sleeve body 501 is fixedly connected to a first friction pair 503 with a circular ring structure at the transverse top end, and the first friction pair 503 is sprayed with cemented carbide or other wear-resistant materials.

[0035] The shaft sleeve assembly 5 is set up to optimize the traditional shaft sleeve. The optimized shaft sleeve body 501 is fixedly connected with the pump cover assembly 6 with a first friction pair 503, so that the first friction pair 503 plays the role of a thrust guide bearing 4. At the same time, it cooperates with the pump cover assembly 6 to realize the shaft head thrust generated by the single-stage pump body 1 when the inlet pressure of the connection port 2 is large, and is transmitted to the pump cover assembly 6 through the shaft sleeve body 501, and then transmitted to the base set at the bottom end of the single-stage pump body 1 through the pump cover assembly 6, thereby realizing the axial force transmission caused, so that the specific pressure of the mechanical seal friction pair will not change significantly, thereby avoiding the axial force borne by the bearing on the rotor from increasing too much due to the increase of the shaft head thrust, thereby realizing that the device can operate stably for a long time during use.

[0036] like Figures 1 to 4 As shown, the top of the sleeve assembly 5 is in conflict with the pump cover assembly 6, and the pump cover assembly 6 includes a pump cover body 601, a second connecting cavity 602 and a second friction pair 603. The bottom end of the pump cover body 601 is in conflict with the top of the sleeve assembly 5, and the pump cover body 601 is fixedly connected to the top of the single-stage pump body 1 by bolts. The top of the pump cover body 601 is penetrated by a second connecting cavity 602, and the inner side wall of the second connecting cavity 602 is fixedly connected to the second friction pair 603 with a circular ring structure. The second friction pair 603 is sprayed with carbide or other wear-resistant materials.

[0037] Through the mutual cooperation between the second friction pair 603 and the first friction pair 503, when the inlet medium passes through the gap between the guide bearing 4 and the sleeve body 501 and enters between the sleeve body 501 and the pump cover body 601, the medium passes between the second friction pair 603 and the first friction pair 503, thereby achieving the function of lubricating and cooling the second friction pair 603 and the first friction pair 503.

[0038] like Figures 1 to 4As shown, the top of the pump cover body 601 is fixedly connected to a mechanical seal 7 with a hollow structure, and one end of the mechanical seal 7 is passed through and fixedly connected to an organic seal exhaust pipe 8, and a mechanical seal chamber is formed between the bottom end of the mechanical seal 7 and the top of the pump cover body 601. The mechanical seal chamber is respectively composed of a first groove and a second groove, and the first groove is opened at the bottom end of the mechanical seal 7, and the second groove is opened at the top of the pump cover body 601. The top of the mechanical seal 7 is fixedly connected to an output component 9, and the output end of the output component 9 passes through the interior of the mechanical seal 7, the interior of the first connecting chamber 502 and the interior of the second connecting chamber 602, and is fixedly connected to the top interior of the guide bearing 4.

[0039] When the single-stage pump body 1 is in operation, the medium after lubrication of the second friction pair 603 and the first friction pair 503 is stored in the mechanical seal chamber and then discharged into the sewage system or other low-pressure treatment system through the mechanical seal exhaust pipe 8. Compared with the traditional single-stage pump body 1, this method throttles and reduces the pressure twice through the guide bearing 4 and the second friction pair 603 and the first friction pair 503. This makes the pressure in the mechanical seal chamber lower and the medium loss smaller. The traditional single-stage pump body 1 structure is difficult to cool the second friction pair 603 and the first friction pair 503 as well as the mechanical seal 7. At the same time, due to the low pressure in the seal chamber, the entire device is in a low working condition, further improving the service life of the mechanical seal 7 and avoiding the high pressure in the traditional mechanical seal chamber, which will directly enter the low-pressure system and cause large leakage losses of the pump group. The mechanical seal is under a high pressure, which is very likely to cause leakage or damage.

[0040] Principle and process of this utility model:

[0041] First, when the single-stage pump body 1 needs to operate, the output component 9 is controlled to output the operation, thereby driving the impeller 3 to rotate;

[0042] Secondly, when the single-stage pump body 1 is in operation, the first friction pair 503 acts as the thrust guide bearing 4 and cooperates with the pump cover assembly 6 to realize the shaft head thrust generated by the single-stage pump body 1 when the inlet pressure of the connection port 2 is relatively high, and realizes that the device can operate stably for a long time during use;

[0043] Afterwards, the second friction pair 603 cooperates with the first friction pair 503 to achieve the function of lubricating and cooling the second friction pair 603 and the first friction pair 503 when the inlet medium passes through the gap between the guide bearing 4 and the sleeve body 501 and enters between the sleeve body 501 and the pump cover body 601.

[0044] Finally, the medium after lubrication of the second friction pair 603 and the first friction pair 503 is stored in the mechanical seal chamber and then discharged into the sewage system or other low-pressure treatment system through the mechanical seal exhaust pipe 8. In this way, a high-pressure single-stage pump structure is completed.

[0045] It should be noted that the present invention is a single-stage pump structure for high pressure, and its components are all universal standard parts or components known to those skilled in the art. Its structure and principle can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted monitoring computers and power supplies, are connected through wires. The specific connection means should refer to the above-mentioned working principle, and the electrical connection is completed between the electrical components in the order of working. The detailed connection means are well-known technologies in this field.

[0046] The above are merely optional embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that the present disclosure may be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A high-pressure single-stage pump structure, characterized in that: The invention comprises a single-stage pump body (1), wherein one end of the single-stage pump body (1) is provided with a connection port (2), and an impeller (3) is provided inside the single-stage pump body (1), a guide bearing (4) is installed at the top end of the impeller (3), and a shaft sleeve assembly (5) is installed at the top end of the guide bearing (4), the top end of the shaft sleeve assembly (5) is in conflict with the bottom end of the pump cover assembly (6), and the pump cover assembly (6) is installed at the top end of the single-stage pump body (1), the shaft sleeve assembly (5) comprises a shaft sleeve body (501), a first connecting cavity (502) and a first friction pair (503), the bottom end of the shaft sleeve body (501) is connected to the top end of the guide bearing (4), and the top end of the shaft sleeve body (501) is penetrated by the first connecting cavity (502), and both sides of the shaft sleeve body (501) are provided with a plurality of connecting ports. A first friction pair (503) is provided, the sleeve body (501) is a cross-shaped structure, the first friction pair (503) is provided at the top of the lateral surface of the sleeve body (501), the pump cover assembly (6) includes a pump cover body (601), a second connecting cavity (602) and a second friction pair (603), the bottom end of the pump cover body (601) is in contact with the top of the sleeve assembly (5), and the top of the pump cover body (601) is provided with a second connecting cavity (602), the outer wall of the second friction pair (603) is installed with the first friction pair (503), the second friction pair (603) and the first friction pair (503) are both sprayed with hard alloy, and the second friction pair (603) and the first friction pair (503) are both arranged in an annular structure.

2. A high-pressure single-stage pump structure according to claim 1, characterized in that: The second friction pair (603) is arranged in a circular ring structure, and the bottom end of the pump cover body (601) is connected to the top end of the single-stage pump body (1).

3. A high-pressure single-stage pump structure according to claim 1, characterized in that: A mechanical seal (7) is installed at the top end of the pump cover assembly (6), and a mechanical seal exhaust pipe (8) is installed at one end of the mechanical seal (7).

4. A high-pressure single-stage pump structure according to claim 3, characterized in that: The bottom end of the mechanical seal (7) is provided with a first groove, and the bottom end of the first groove is provided with a second groove, the second groove is provided at the top end of the pump cover body (601), and a mechanical seal chamber is formed between the first groove and the second groove.

5. The high-pressure single-stage pump structure according to claim 3, characterized in that: An output assembly (9) is installed through the top end of the mechanical seal (7), and the output end of the output assembly (9) extends to the inside of the first connecting cavity (502) and the second connecting cavity (602), and is connected to the top end of the guide bearing (4).

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