Self-pressure-measuring type single-stage double-suction centrifugal pump

Abstract

The invention belongs to the field of centrifugal pump design, and discloses a self-pressure-measuring type single-stage double-suction centrifugal pump, an outlet of a pump body is connected with a pressure sensor, the pressure sensor is connected with a controller, and the controller controls the rotating speed of a motor according to data transmitted by the pressure sensor, so that the medium pressure at the outlet of the pump is stabilized within a certain range. According to the self-pressure-measuring type single-stage double-suction centrifugal pump, pressure can be measured and controlled automatically, and the medium pressure of an outlet of the centrifugal pump is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of centrifugal pump design, and relates to a single-stage double-suction centrifugal pump, and in particular to a pressure measuring and pressure regulating structure design of a single-stage double-suction centrifugal pump. Background Art

[0002] With the development demand for high maneuverability, high altitude and high speed performance of the new generation of aircraft, higher requirements are placed on the fuel centrifugal pump in the fuel subsystem, requiring the fuel centrifugal pump to have ultra-large flow output capacity, ultra-low power consumption, high power-to-weight ratio, multi-function integration, multi-operating point performance matching and other functional performances.

[0003] Traditional fuel centrifugal pumps mainly monitor the outlet pressure of the pump through the pressure sensor integrated in the superior fuel subsystem. It simply determines whether the pump is working normally. It does not have the ability to adjust the operating status of the centrifugal pump according to the monitored pressure value to better match the requirements of the superior system.

[0004] With the development of more-electric aircraft or all-electric aircraft, a new type of intelligent adaptive pump that integrates mechanical, electrical and control technologies is an inevitable development trend. It has two major characteristics of fluid and motion control. It can collect pressure through the integrated pressure sensor inside the pump body and perform adaptive speed control by the controller according to different requirements, so that the pump output performance meets the expected index requirements and realizes intelligent control. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a self-pressure measuring single-stage double-suction centrifugal pump, which can measure and control pressure by itself to ensure the medium pressure at the outlet of the centrifugal pump, and has a compact structure and high reliability.

[0006] The technical solution of the present invention is as follows:

[0007] A self-pressure-testing single-stage double-suction centrifugal pump has a pressure sensor connected to the pump body outlet, and the pressure sensor is connected to a controller. The controller controls the speed of the motor according to the data transmitted by the pressure sensor to stabilize the medium pressure at the pump outlet within a certain range.

[0008] Furthermore, the pressure sensor and the controller are integrated on the housing of the centrifugal pump.

[0009] Furthermore, it includes a lower shell assembly, which is the shell of the lower pump of the double-suction centrifugal pump. A cylindrical groove is opened at the bottom of the lower shell assembly, the top of the cylindrical groove is connected to the pump body outlet through a hollow tube, and an adapter socket is provided at the bottom of the cylindrical groove, which is connected to the controller; a cylindrical pressure sensor is inserted into the cylindrical groove.

[0010] Furthermore, a cylindrical controller housing is connected to the bottom of the lower housing assembly. The controller is disposed in the controller housing. The controller is electrically connected to the motor and the adapter socket respectively.

[0011] Furthermore, the controller controls the speed of the motor according to the data transmitted by the pressure sensor. When the pressure data transmitted by the pressure sensor drops below a first threshold value, the controller controls the motor speed to increase by a set speed value, and after a certain period of time, controls the motor speed to continue to increase by a set speed value until the pressure data transmitted by the pressure sensor is higher than the first threshold value plus a set anti-repetition value; when the pressure data transmitted by the pressure sensor drops below a second threshold value, the controller controls the motor speed to decrease by a set speed value, and after a certain period of time, controls the motor speed to continue to decrease by a set speed value until the pressure data transmitted by the pressure sensor is lower than the second threshold value minus a set anti-repetition value.

[0012] Furthermore, the double-suction centrifugal pump also includes an upper pump, and a pump outlet of the double-suction centrifugal pump is arranged on the side of the upper shell component of the upper pump.

[0013] Furthermore, the upper housing assembly is connected to the lower housing assembly through an oil delivery pipe, the upper housing assembly is equipped with an upper impeller, the upper impeller is matched with the upper housing by adjusting the impeller height by the number of bottom washers, and the lower housing assembly is equipped with a lower impeller, the lower impeller is matched with the lower housing by adjusting the impeller height by the number of bottom washers. The overall capacity of the centrifugal pump can be changed by adjusting the height of the washers, so that the performance point can be adjusted.

[0014] Furthermore, the oil inlets of the upper pump and the lower pump are both provided with filters.

[0015] The beneficial effects of the present invention are as follows:

[0016] The invention is a self-pressure measuring single-stage double-suction centrifugal pump which can measure and control pressure by itself to ensure the medium pressure at the outlet of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a single-stage double-suction centrifugal pump of the present invention;

[0019] Among them, 1—upper oil inlet, 2—upper filter, 3—inducer, 4—upper housing assembly, 5—outlet pipe joint, 6—upper impeller, 7—oil pipeline, 8—motor, 9—pressure sensor, 10—lower housing assembly, 11—lower impeller, 12—lower oil inlet, 13—adapter socket, 14—lower filter. DETAILED DESCRIPTION

[0020] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] Embodiment 1:

[0024] A self-pressure-testing single-stage double-suction centrifugal pump, a pressure sensor 9 is connected to the pump body outlet, the pressure sensor 9 is connected to the controller, the controller controls the speed of the motor 8 according to the data transmitted by the pressure sensor 9, so that the medium pressure at the pump outlet is stable within a certain range.

[0025] The pressure sensor 9 and the controller are integrated on the housing of the centrifugal pump.

[0026] It includes a lower shell component 10, which is the shell of the lower pump of the double-suction centrifugal pump. A cylindrical groove is opened at the bottom of the lower shell component 10, and the top of the cylindrical groove is connected to the pump body outlet through a hollow tube. An adapter socket 13 is provided at the bottom of the cylindrical groove, and the adapter socket 13 is connected to the controller; a cylindrical pressure sensor 9 is inserted into the cylindrical groove.

[0027] A cylindrical controller housing is connected to the bottom of the lower housing assembly 10 . The controller is arranged in the controller housing. The controller is electrically connected to the motor 8 and the adapter socket 13 respectively.

[0028] The controller controls the speed of the motor 8 according to the data transmitted by the pressure sensor 9. When the pressure data transmitted by the pressure sensor 9 drops below the first threshold value, the controller controls the speed of the motor 8 to increase by a set speed value, and after a certain period of time, controls the speed of the motor 8 to continue to increase by a set speed value, until the pressure data transmitted by the pressure sensor 9 is higher than the first threshold value plus a set anti-repetition value; when the pressure data transmitted by the pressure sensor 9 drops below the second threshold value, the controller controls the speed of the motor 8 to decrease by a set speed value, and after a certain period of time, controls the speed of the motor 8 to continue to decrease by a set speed value, until the pressure data transmitted by the pressure sensor 9 is lower than the second threshold value minus a set anti-repetition value.

[0029] The double-suction centrifugal pump further comprises an upper pump, and a pump outlet of the double-suction centrifugal pump is arranged on a side surface of an upper casing component 4 of the upper pump.

[0030] The upper housing assembly 4 is connected to the lower housing assembly 10 through an oil delivery pipe 7. The upper housing assembly 4 is provided with an upper impeller 6, and the upper impeller 6 is matched with the upper housing by adjusting the impeller height by the number of bottom washers. The lower housing assembly 10 is provided with a lower impeller 11, and the lower impeller 11 is matched with the lower housing by adjusting the impeller height by the number of bottom washers. The overall capacity of the centrifugal pump can be changed by adjusting the height of the washers, and the performance point can be adjusted.

[0031] The oil inlets of the upper pump and the lower pump are both equipped with filters.

[0032] Embodiment 2:

[0033] The patent of the present invention relates to the field of hydraulic machinery technology, and discloses a self-pressure-testing single-stage double-suction centrifugal pump. The centrifugal pump is a single-stage double-suction structure, and a cylindrical groove is opened at the bottom of the centrifugal pump body. The bottom of the cylindrical groove is connected to the pump body outlet through a hollow tube. The pressure at the outlet of the centrifugal pump body is measured by inserting a pressure sensor in the cylindrical groove, and the measured pressure is fed back to the controller in real time. The controller adjusts the current outlet pressure to achieve self-pressure regulation. This structure integrates the pressure sensor into the pump body, which not only reduces the error of the pressure measurement of the external sensor, but also increases the overall integration of the centrifugal pump and reduces its overall weight. At the same time, the centrifugal pump structure adopts an open impeller structure, and the misalignment between the upper and lower impellers and the volute can be adjusted by gaskets at the bottom. The capacity of the entire pump can be adjusted by adjusting the number of upper and lower impeller gaskets, and the performance of the entire pump can be adjusted to adapt to more situations and different boosting requirements.

[0034] A self-regulating single-stage double-suction centrifugal pump, the centrifugal pump has a pressure measuring and self-regulating structure, a signal line is led out through a transfer socket 13 installed on a lower shell component 10, the bottom of the transfer socket 13 is connected to a pressure sensor 9, the pressure sensor 9 is connected to an upper shell component 4 through a hollow tubular structure, and the outlet of the upper shell component 4 is connected to an outlet pipe joint 5 through a bolt structure, and the self-regulating capability is achieved through the above structure.

[0035] The centrifugal pump has an upper and lower impeller structure that can be adjusted in height. Its upper shell assembly 4 is connected to the lower shell assembly 10 through an oil pipe 7. The upper shell assembly 4 is equipped with an upper impeller 6. The upper impeller 6 adjusts the impeller height and the fit between the upper shell by adjusting the number of bottom gaskets. The lower shell assembly 10 is equipped with a lower impeller 11. The lower impeller 11 adjusts the impeller height and the fit between the lower shell by adjusting the number of bottom gaskets. The overall capacity of the centrifugal pump can be changed by adjusting the height of the gaskets, so that the performance point can be adjusted.

[0036] The centrifugal pump is a single-stage double-suction structure, and its upper shell assembly 4 is connected to the lower shell assembly 10 through an oil pipe 7. The upper shell assembly 4 is connected to the upper oil inlet 1 through a bolt structure. The upper oil inlet 1 is covered by an upper filter 2. The upper filter 2 can filter the liquid entering from the upper oil inlet. The lower shell assembly 10 is equipped with a lower filter 14, and a transfer socket 13 is installed in the bottom opening.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A self-pressure testing single-stage double-suction centrifugal pump, characterized in that: A pressure sensor (9) is connected to the outlet of the pump body, and the pressure sensor (9) is connected to a controller. The controller controls the rotation speed of the motor (8) according to data transmitted by the pressure sensor (9), so that the medium pressure at the outlet of the pump is stabilized within a certain range.

2. A self-pressure testing single-stage double-suction centrifugal pump according to claim 1, characterized in that: The pressure sensor (9) and the controller are integrated on the housing of the centrifugal pump.

3. A self-pressure testing single-stage double-suction centrifugal pump according to claim 2, characterized in that: The invention comprises a lower housing component (10), which is the housing of the lower pump of a double-suction centrifugal pump. A cylindrical groove is provided at the bottom of the lower housing component (10), the top of the cylindrical groove is connected to the pump body outlet via a hollow pipe, a switching socket (13) is provided at the bottom of the cylindrical groove, and the switching socket (13) is connected to a controller; a cylindrical pressure sensor (9) is inserted into the cylindrical groove.

4. A self-pressure testing single-stage double-suction centrifugal pump according to claim 3, characterized in that: A cylindrical controller housing is connected to the bottom of the lower housing component (10). The controller is arranged in the controller housing. The controller is electrically connected to the motor (8) and the adapter socket (13) respectively.

5. A self-pressure testing single-stage double-suction centrifugal pump according to claim 1, characterized in that: The controller controls the rotation speed of the motor (8) according to the data transmitted by the pressure sensor (9); when the pressure data transmitted by the pressure sensor (9) drops below a first threshold value, the controller controls the rotation speed of the motor (8) to increase by a set speed value, and after a certain period of time, controls the rotation speed of the motor (8) to continue to increase by a set speed value until the pressure data transmitted by the pressure sensor (9) is higher than the first threshold value plus a set anti-repetition value; when the pressure data transmitted by the pressure sensor (9) drops below a second threshold value, the controller controls the rotation speed of the motor (8) to decrease by a set speed value, and after a certain period of time, controls the rotation speed of the motor (8) to continue to decrease by a set speed value until the pressure data transmitted by the pressure sensor (9) is lower than the second threshold value minus a set anti-repetition value.

6. A self-pressure testing single-stage double-suction centrifugal pump according to claim 1, characterized in that: The double-suction centrifugal pump also includes an upper pump, and a pump outlet of the double-suction centrifugal pump is arranged on the side of an upper casing component (4) of the upper pump.

7. A self-pressure testing single-stage double-suction centrifugal pump according to claim 6, characterized in that: The upper housing component (4) is connected to the lower housing component (10) via an oil delivery pipe (7); the upper housing component (4) is provided with an upper impeller (6); the upper impeller (6) is provided with a height adjustment for the fit between the upper housing and the upper housing by adjusting the number of bottom washers; the lower housing component (10) is provided with a lower impeller (11); the lower impeller (11) is provided with a height adjustment for the fit between the lower housing and the lower housing by adjusting the number of bottom washers.

8. A self-pressure testing single-stage double-suction centrifugal pump according to claim 6, characterized in that: The oil inlets of the upper pump and the lower pump are both equipped with filters.

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