Protector testing device and testing system

Abstract

The utility model relates to the technical field of mechanical equipment, and discloses a protector testing device and system, and the protector testing device comprises an outer cylinder, a piston shell and a piston assembly. The outer cylinder is provided with a containing cavity, the piston shell is contained in the containing cavity and can move relative to the outer cylinder along the cavity wall of the containing cavity, a piston cavity is formed in one end of the piston shell, and the other end of the piston shell is used for being connected with one protector. One end of the piston assembly is contained in the piston cavity, the piston assembly can move along the cavity wall of the piston cavity relative to the piston shell, and the other end of the piston assembly is used for being connected with another protector. The outer cylinder and the piston shell are provided with liquid injection channels communicated with the piston cavity, the liquid injection channels are used for allowing fluid to enter the piston cavity, the fluid exerts pressure on the piston assembly and the piston shell, then the piston assembly and the piston shell exert axial thrust on the middle shafts of the two protectors, and thrust testing is conducted on the two protectors at the same time. The test efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to a protector testing device and a testing system. Background Art

[0002] Submersible screw pumps are widely used in oilfield exploitation. Submersible screw pumps include submersible screw pump units, protectors, and submersible motors. When the submersible motor drives the submersible screw pump unit to lift well fluid, the submersible screw pump will apply axial force to the submersible motor, so a protector needs to be installed at one end of the submersible motor. Before use, it is very important to test the thrust of the protector to ensure safe production.

[0003] The existing method of thrust testing the protector is to use a device that can apply pressure in one direction to apply axial pressure to a protector shaft, but this method can only test one set of products at a time, and the test efficiency is low. Utility Model Content

[0004] In view of the problems existing in the background technology, the purpose of the present application is to provide a protector testing device and a testing system to overcome the above problems or at least partially solve the above problems.

[0005] According to the first aspect of the present application, a protector testing device is provided, which is used to apply thrust to two protectors, and the protector testing device includes an outer cylinder, a piston shell and a piston assembly. The outer cylinder is provided with a receiving chamber. The piston shell is accommodated in the receiving chamber, and the piston shell can move relative to the outer cylinder along the chamber wall of the receiving chamber. One end of the piston shell is provided with a piston chamber, and the other end of the piston shell is used to connect one of the protectors. One end of the piston assembly is accommodated in the piston chamber, and the piston assembly can move relative to the piston shell along the chamber wall of the piston chamber, and the other end of the piston assembly is used to connect the other protector. In which, the outer cylinder and the piston shell are provided with an injection channel, and the injection channel is connected to the piston chamber, and the injection channel is used to supply fluid into the piston chamber.

[0006] In one or more optional embodiments above, the piston assembly includes a piston seat, an elastic member and a piston head, and the two ends of the elastic member are respectively connected to the piston seat and the piston head. The piston seat is accommodated in the piston cavity, and the piston seat can drive the piston head to move relative to the piston shell. The end of the piston head away from the elastic member is used to connect to the other protector.

[0007] In one or more of the above optional embodiments, the piston seat is provided with a sliding cavity, the elastic member is accommodated in the sliding cavity, the piston head is at least partially accommodated in the sliding cavity, and the piston head can move relative to the piston seat along the cavity wall of the sliding cavity.

[0008] In one or more of the above optional embodiments, a first guide structure is provided between the cavity wall of the piston cavity and the outer wall of the piston seat, and the first guide structure can guide the piston seat to move relative to the piston shell; and / or a second guide structure is provided between the cavity wall of the sliding cavity and the outer wall of the piston head, and the second guide structure can guide the piston head to move relative to the piston seat.

[0009] In one or more of the above optional embodiments, a sealing ring is provided between the cavity wall of the piston cavity and the outer wall of the piston seat; and / or a one-way valve is provided in the injection channel; and / or a pressure relief structure connected to the piston cavity is provided on the piston shell.

[0010] In one or more of the above optional embodiments, it also includes a first connecting component, which is accommodated in the accommodating cavity, one end of the first connecting component is connected to the piston shell, and the other end of the first connecting component is used to connect to one of the protectors; and / or it also includes a second connecting component, which is accommodated in the accommodating cavity, one end of the second connecting component is connected to the piston head, and the other end of the second connecting component is used to connect to another protector.

[0011] In one or more of the above optional embodiments, it also includes a first connecting shaft and a first coupling, wherein the two ends of the first connecting shaft are respectively connected to the piston housing and the first coupling, and the end of the first coupling facing away from the first connecting shaft is used to connect to the central axis of one of the protectors; and / or it also includes a second connecting shaft and a second coupling, wherein the two ends of the second connecting shaft are respectively connected to the piston head and the second coupling, and the end of the second coupling facing away from the second connecting shaft is used to connect to the central axis of another protector.

[0012] In one or more of the above optional embodiments, it also includes a first connecting shaft and a first connecting flange, the first connecting flange is received and fixed in the accommodating cavity, and the first connecting flange is sleeved outside the first connecting shaft, one end of the first connecting shaft is connected to the piston shell, and the other end of the first connecting shaft is used to connect to the central axis of one of the protectors, and the end of the first connecting flange facing away from the piston shell is used to connect to the outer shell of one of the protectors; and / or also includes a second connecting shaft and a second connecting flange, the second connecting flange is received and fixed in the accommodating cavity, and the second connecting flange is sleeved outside the second connecting shaft, one end of the second connecting shaft is connected to the piston head, and the other end of the second connecting shaft is used to connect to the central axis of another protector, and the end of the second connecting flange facing away from the piston head is used to connect to the outer shell of another protector.

[0013] In one or more of the above optional embodiments, it also includes a first connecting shaft, a first coupling, a first connecting flange and a first fastener, the two ends of the first connecting shaft are respectively connected to the piston housing and the first coupling, the first connecting flange is received and fixed in the accommodating cavity, and the first connecting flange is sleeved outside the first connecting shaft, the end of the first coupling facing away from the first connecting shaft is used to connect the middle axis of one of the protectors, and the first fastener is used to connect the first connecting flange and the outer shell of one of the protectors; and / or it also includes a second connecting shaft, a second coupling, a second connecting flange and a second fastener, the two ends of the second connecting shaft are respectively connected to the piston head and the second coupling, the second connecting flange is received and fixed in the accommodating cavity, and the second connecting flange is sleeved outside the second connecting shaft, the end of the second coupling facing away from the second connecting shaft is used to connect the middle axis of another protector, and the second fastener is used to connect the second connecting flange and the outer shell of another protector.

[0014] According to a second aspect of the present application, a test system is provided, comprising the protector test device as described above, a fluid pump and a rotation drive device. The fluid pump is connected to the injection channel of the protector test device, and the fluid pump is used to input fluid into the piston chamber of the protector test device through the injection channel. The rotation drive device is used to apply torque to the two protectors.

[0015] The beneficial effects of the embodiments of the present application are as follows: the protector testing device provided by the embodiments of the present application connects the central axis of one of the protectors through the piston shell, and the piston assembly connects the central axis of the other protector. When fluid is introduced into the piston cavity through the injection channel, the fluid applies pressure to the piston assembly and the piston shell respectively to drive the piston assembly to move along the cavity wall of the piston cavity relative to the piston shell, thereby causing the piston assembly and the piston shell to apply axial thrust to the central axes of the two protectors respectively. In this way, the protector testing device provided by the embodiments of the present application can perform thrust tests on two protectors at the same time, which improves the test efficiency compared to the traditional test method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 A schematic diagram of a protector testing device 1000 provided by an embodiment of the utility model when connected to protectors of two screw pumps;

[0018] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of . DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0021] In the description of this specification, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0022] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0023] See also Figure 1 and Figure 2, the protector testing device 1000 is used to apply thrust to two protectors, and the protector testing device 1000 includes an outer tube 1, a piston shell 41 and a piston assembly 42. The outer tube 1 is provided with a receiving chamber 1a. The piston shell 41 is accommodated in the receiving chamber 1a, and the piston shell 41 can move relative to the outer tube 1 along the cavity wall of the receiving chamber 1a. One end of the piston shell 41 is provided with a piston cavity (not shown), and the other end of the piston shell 41 is used to connect one of the protectors. One end of the piston assembly 42 is accommodated in the piston cavity, and the piston assembly 42 can move relative to the piston shell 41 along the cavity wall of the piston cavity, and the other end of the piston assembly 42 is used to connect the other protector. Among them, an injection channel 41b is provided on the outer tube 1 and the piston shell 41, and the injection channel 41b is connected to the piston cavity, and the injection channel 41b is used to supply fluid into the piston cavity.

[0024] Taking the screw pump as an example of a submersible screw pump, the protector of the submersible screw pump includes a protector housing and a central axis rotatably disposed in the protector housing. The protector test device 1000 provided in the embodiment of the present application connects the central axis A1 of one of the protectors through the piston shell 41, and the piston assembly 42 connects the central axis A2 of the other protector. When the fluid is introduced into the piston cavity through the injection channel 41b, the fluid applies pressure to the piston assembly 42 and the piston shell 41 respectively to drive the piston assembly 42 to move along the cavity wall of the piston cavity relative to the piston shell 41, thereby causing the piston assembly 42 and the piston shell 41 to apply axial thrust to the central axis A1 and the central axis A2 respectively. In this way, the protector test device 1000 provided in the embodiment of the present application can perform thrust tests on two screw pumps at the same time, which improves the test efficiency compared to the traditional test method.

[0025] In some embodiments, one end of the piston seat 421 and the inner wall of the piston cavity enclose a pressure cavity 41a, and the injection channel 41b is connected to the pressure cavity 41a. When fluid is introduced into the pressure cavity 41a through the injection channel 41b, the fluid applies thrusts F1 and F2 to the piston assembly 42 and the piston housing 41, respectively, thereby causing the piston assembly 42 and the piston housing 41 to apply axial thrusts to the central axis A1 and the central axis A2 in opposite directions, respectively.

[0026] In some embodiments, the fluid is hydraulic oil. It is understood that in some other embodiments, the fluid may also be a gas such as nitrogen, or may also be other liquids.

[0027] In some embodiments, the piston assembly 42 includes a piston seat 421, an elastic member 422 and a piston head 423, and the two ends of the elastic member 422 are respectively connected to the piston seat 421 and the piston head 423. The piston seat 421 is accommodated in the piston cavity, and the piston seat 421 can drive the piston head 423 to move relative to the piston shell 41. The piston shell 41 is connected to one of the protectors, and the end of the piston head 423 away from the elastic member 422 is used to connect to the other protector. The piston head 423 can move relative to the piston seat 421 to compress the elastic member 422. When the fluid is introduced into the piston cavity through the injection channel 41b, the elastic member 422 can play the role of energy absorption and buffering, reducing the impact force caused by the instantaneous increase in the pressure in the piston cavity, thereby reducing the risk of damage to the protector test device 1000 and the protector of the screw pump during the test process.

[0028] In some embodiments, the elastic member 422 is a disc spring. In other embodiments, the elastic member 422 can also be a coil spring, a leaf spring, an elastic sheet, etc., without specific limitation.

[0029] In some embodiments, the piston seat 421 is provided with a sliding cavity (not shown), the elastic member 422 is accommodated in the sliding cavity, the piston head 423 is at least partially accommodated in the sliding cavity, and the piston head 423 can move relative to the piston seat 421 along the cavity wall of the sliding cavity.

[0030] In some embodiments, the piston seat 421 includes a bottom wall 4211 and a side wall 4212 . The side wall 4212 is arranged around an end of the bottom wall 4211 facing away from the pressure chamber 41 a . The side wall 4212 and the bottom wall 4211 are combined to form a sliding chamber.

[0031] In some embodiments, a first guide structure is provided between the cavity wall of the piston cavity and the outer wall of the piston seat 421 , and the first guide structure can guide the piston seat 421 to move relative to the piston housing 41 .

[0032] In some embodiments, the first guide structure includes a first flat key 411 disposed on the cavity wall of the piston cavity, and a first key groove 421b disposed on the outer wall of the piston seat 421. The first key groove 421b is extended along the axial direction of the piston cavity, and the first flat key 411 is slidably disposed in the first key groove 421b. The first flat key 411 cooperates with the first key groove 421b to transmit torque between the piston housing 41 and the piston seat 421 so that the piston housing 41 can rotate together with the piston seat 421, and guides the piston seat 421 in the piston cavity.

[0033] In some embodiments, a second guide structure is provided between the cavity wall of the sliding cavity and the outer wall of the piston head 423 , and the second guide structure can guide the piston head 423 to move relative to the piston seat 421 .

[0034] In some embodiments, the second guide structure includes a second flat key (not shown) disposed on the outer wall of the piston head 423, and a second key groove a disposed on the side of the side wall 4212 facing the sliding cavity. The second key groove 423a is extended along the axial direction of the piston cavity, and the second flat key is slidably disposed in the second key groove 423a. The second flat key cooperates with the second key groove 423a to transmit torque between the piston head 423 and the side wall 4212 and guide the piston head 423 in the sliding cavity.

[0035] In some embodiments, a sealing ring 43 is provided between the cavity wall of the piston cavity and the outer wall of the piston seat 421. The sealing ring 43 is used to seal the gap between the outer wall of the piston seat 421 and the inner wall of the piston cavity.

[0036] In some embodiments, an annular groove is disposed on the outer peripheral wall of the piston seat 421, and the sealing ring 43 is disposed in the annular groove.

[0037] In some embodiments, the injection channel 41b is provided with a one-way valve 412, and the one-way valve 412 is used to maintain the pressure in the piston cavity after the fluid is introduced into the piston cavity through the injection channel 41b.

[0038] In some embodiments, a pressure relief structure communicating with the piston chamber is provided on the piston housing 41 .

[0039] In some embodiments, the piston housing 41 is provided with a pressure relief hole 41c, which is connected to the pressure chamber 41a and provided with a pressure relief valve 413. After the pressure test is completed, the pressure relief valve 413 is opened to discharge the high-pressure fluid in the pressure chamber 41a through the pressure relief hole 41c.

[0040] In some embodiments, a first opening (not shown) and a second opening (not shown) are provided at opposite ends of the outer tube 1 , and the first opening and the second opening are communicated with the accommodating chamber 1 a respectively.

[0041] In some embodiments, the outer cylinder 1 is generally cylindrical, and the inner wall of the outer cylinder 1 encloses and forms a receiving cavity 1 a which is connected to the first opening and the second opening respectively.

[0042] In some embodiments, the protector testing device 1000 further includes a first connecting component, which is received in the accommodating chamber 1a, one end of which is connected to the piston housing 41, and the other end of which is used to connect to one of the protectors.

[0043] In some embodiments, the first connecting assembly includes a first connecting shaft 51 and a first coupling 52, wherein both ends of the first connecting shaft 51 are respectively connected to the piston housing 41 and the first coupling 52, and an end of the first coupling 52 away from the first connecting shaft 51 is used to connect to the central axis A1 of one of the protectors.

[0044] In some embodiments, the first connecting assembly includes a first connecting shaft 51 and a first connecting flange 21. The first connecting flange 21 is accommodated and fixed in the accommodating chamber 1a, and the first connecting flange 21 is sleeved on the outside of the first connecting shaft 51. One end of the first connecting shaft 51 is connected to the piston shell 41, and the other end of the first connecting shaft 51 is used to connect to the central axis A1 of one of the protectors. The end of the first connecting flange 21 facing away from the piston shell 41 is used to connect to the outer shell S1 of one of the protectors.

[0045] In some embodiments, the first connecting assembly includes a first connecting shaft 51, a first coupling 52, a first connecting flange 21 and a first fastener 23. The two ends of the first connecting shaft 51 are respectively connected to the piston housing 41 and the first coupling 52. The first connecting flange 21 is accommodated and fixed in the accommodating chamber 1a, and the first connecting flange 21 is sleeved on the outside of the first connecting shaft 51. The end of the first coupling 52 facing away from the first connecting shaft 51 is used to connect the central axis A1 of one of the protectors, and the first fastener 23 is used to connect the first connecting flange 21 and the outer shell S1 of one of the protectors.

[0046] In some embodiments, a first communication port (not shown) is formed at one end of the piston housing 41 near the first connecting flange 21 , the first communication port is connected to the accommodating chamber 1 a , and the piston assembly 42 is connected to the first connecting shaft 51 through the first communication port.

[0047] In some embodiments, the first connection flange 21 includes a first mounting seat 211 and a first protrusion 212. One end of the first protrusion 212 is connected to the first mounting seat 211, and the first protrusion 212 is inserted into the accommodating cavity 1a through the first opening in the direction from the first opening to the second opening, and the first mounting seat 211 abuts against the end surface of the outer cylinder 1 facing the first mounting seat 211. The first connection flange 21 is provided with a first mounting hole (not shown), and the first mounting hole passes through the first mounting seat 211 and the first protrusion 212 in the direction from the first opening to the second opening, and the first connecting shaft 51 is passed through the first mounting hole.

[0048] In some embodiments, the first connecting assembly further includes a first sliding bearing 53 , the first sliding bearing 53 is disposed in the first mounting hole, and the first connecting shaft 51 passes through the first sliding bearing 53 .

[0049] In some embodiments, the first mounting seat 211 is provided with a plurality of first external connection holes (not shown), and the plurality of first external connection holes are arranged around the axis of the first mounting hole. The protector testing device 1000 further includes a plurality of first external connection bolts 22 corresponding to the first external connection holes one by one, and the first mounting seat 211 is screwed and fixed to the outer cylinder 1 through the first external connection bolts 22.

[0050] In some embodiments, the first protrusion 212 is provided with a plurality of first inner connection holes (not shown), and the plurality of first inner connection holes are arranged around the axis of the first mounting hole. The first fastener includes a plurality of first inner connection bolts 23 corresponding to the first inner connection holes one by one, and the first inner connection bolts 23 are used to pass through the first inner connection holes to screw the first protrusion 212 to the housing S1 of the protector of a screw pump.

[0051] In some embodiments, the protector testing device 1000 includes a second connecting component, which is received in the accommodating chamber 1a, one end of the second connecting component is connected to the piston head 423, and the other end of the second connecting component is used to connect to another protector.

[0052] In some embodiments, the second connecting assembly includes a second connecting shaft 61 and a second coupling 62, wherein both ends of the second connecting shaft 61 are respectively connected to the piston head 423 and the second coupling 62, and the end of the second coupling 62 away from the second connecting shaft 61 is used to connect to the central axis A2 of another protector.

[0053] In some embodiments, the second connecting assembly includes a second connecting shaft 61 and a second connecting flange 31, the second connecting flange 31 is accommodated and fixed in the accommodating chamber 1a, and the second connecting flange 31 is sleeved outside the second connecting shaft 61, one end of the second connecting shaft 61 is connected to the piston head 423, and the other end of the second connecting shaft 61 is used to connect to the central axis A1 of another protector, and the end of the second connecting flange 31 facing away from the piston head 423 is used to connect to the outer shell S2 of another protector.

[0054] In some embodiments, the second connecting assembly includes a second connecting shaft 61, a second coupling 62, a second connecting flange 31 and a second fastener. The two ends of the second connecting shaft 61 are respectively connected to the piston head 423 and the second coupling 62. The second connecting flange 31 is accommodated and fixed in the accommodating chamber 1a, and the second connecting flange 31 is sleeved on the outside of the second connecting shaft 61. The end of the second coupling 62 facing away from the second connecting shaft 61 is used to connect to the central axis A2 of another protector, and the second fastener is used to connect the second connecting flange 31 and the outer shell S2 of another protector.

[0055] In some embodiments, the second connection flange 31 includes a second mounting seat 311 and a second protrusion 312. One end of the second protrusion 312 is connected to the second mounting seat 311, and the second protrusion 312 is inserted into the accommodating cavity 1a through the second opening in the direction from the second opening to the first opening, and the second mounting seat 311 abuts against the end surface of the outer cylinder 1 facing the second mounting seat 311. The second connection flange 31 is provided with a second mounting hole (not shown), and the second mounting hole passes through the second mounting seat 311 and the second protrusion 312 in the direction from the second opening to the first opening, and the second connecting shaft 51 is penetrated through the second mounting hole.

[0056] In some embodiments, the second connecting assembly further includes a second sliding bearing 63 , the second sliding bearing 63 is disposed in the second mounting hole, and the second connecting shaft 61 passes through the second sliding bearing 63 .

[0057] In some embodiments, the second mounting seat 311 is provided with a plurality of second external connection holes (not shown), and the plurality of second external connection holes are arranged around the axis of the second mounting hole. The protector testing device 1000 further includes a plurality of second external connection bolts 32 corresponding to the second external connection holes one by one, and the second mounting seat 311 is screwed and fixed to the outer cylinder 1 through the second external connection bolts 32.

[0058] In some embodiments, the second protrusion 312 is provided with a plurality of second inner connection holes (not shown), and the plurality of second inner connection holes are arranged around the axis of the second mounting hole. The second fastener includes a plurality of second inner connection bolts 33 corresponding to the second inner connection holes one by one, and the second inner connection bolts 33 are used to pass through the second inner connection holes to screw the second protrusion 312 to the housing S2 of the protector of another screw pump.

[0059] It is understandable that the outer cylinder 1 is not limited to being connected to the protector housing of the screw pump by setting the above-mentioned first connecting flange 21 and the first fastener and the second connecting flange 31 and the second fastener in a flange-bolt matching manner. In some other embodiments, the outer cylinder 1 can also be connected to the protector housing of the screw pump by means of snap-fitting or the like. The structural types of the first connecting assembly and the second connecting assembly can be matched with the housing of the protector of the screw pump according to actual conditions, so as to meet the requirement that the housing of the protector of the screw pump can be detachably fixed to the outer cylinder 1.

[0060] It can also be understood that the types of the first coupling 52 and the second coupling 62 can be selected according to actual needs. The first coupling 52 and the second coupling 62 can be flange couplings, cross slider couplings, plum blossom couplings, etc.

[0061] In some embodiments, the piston chamber is extended from the second opening to the first opening, and one end of the piston seat 421 close to the second opening is enclosed with the inner wall of the piston chamber to form a pressure chamber 41a, and the injection channel 41b is connected to the pressure chamber 41a. When the protector testing device 1000 is tested, when the fluid is introduced into the pressure chamber 41a through the injection channel 41b, the fluid applies pressure F1 to the piston assembly 42 from the second opening to the first opening, so that the piston assembly 42 applies axial pressure from the second opening to the first opening to the protector shaft A1 of one screw pump through the first connecting shaft 51 and the first coupling 52; at the same time, the high-pressure fluid applies pressure F2 to the piston shell 41 from the first opening to the second opening, so that the piston shell 41 applies axial pressure from the first opening to the second opening to the protector shaft A2 of another screw pump through the second connecting shaft 61 and the second coupling 62.

[0062] Based on the same inventive concept, the embodiment of the present application further provides a test system, comprising the protector test device 1000 in any of the above embodiments, a fluid pump and a rotation drive device. The fluid pump is connected to the injection channel 41b, and the fluid pump is used to input fluid into the piston chamber through the injection channel 41b. The rotation drive device is used to apply torque to the two protectors.

[0063] It is understandable that the fluid pump can be configured as an air pump or a liquid pump according to the actual fluid selected.

[0064] In some embodiments, the rotary drive device is used to connect to the protector shaft A1 of one of the screw pumps. When the rotary drive device is working, the rotary drive device drives the protector shaft A2 of the screw pump connected thereto to rotate, thereby driving the protector shaft A2 of the other screw pump to rotate.

[0065] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A protector testing device, used to apply thrust to two protectors, characterized in that: include: The outer cylinder is provided with a containing cavity; A piston shell is received in the accommodating cavity, the piston shell can move relative to the outer cylinder along the cavity wall of the accommodating cavity, one end of the piston shell is provided with a piston cavity, and the other end of the piston shell is used to connect one of the protectors; A piston assembly, one end of which is received in the piston cavity, the piston assembly being movable relative to the piston housing along the cavity wall of the piston cavity, and the other end of which is used to connect to another protector; Wherein, the outer tube and the piston shell are provided with a liquid injection channel, the liquid injection channel is communicated with the piston cavity, and the liquid injection channel is used for allowing fluid to enter the piston cavity.

2. The protector testing device according to claim 1, characterized in that: The piston assembly comprises a piston seat, an elastic member and a piston head, and two ends of the elastic member are respectively connected to the piston seat and the piston head; The piston seat is accommodated in the piston cavity, and the piston seat can drive the piston head to move relative to the piston shell; One end of the piston head facing away from the elastic member is used for connecting with the other protector.

3. The protector testing device according to claim 2, characterized in that: The piston seat is provided with a sliding cavity, the elastic member is accommodated in the sliding cavity, the piston head is at least partially accommodated in the sliding cavity, and the piston head can move relative to the piston seat along the cavity wall of the sliding cavity.

4. The protector testing device according to claim 3, characterized in that: A first guide structure is provided between the cavity wall of the piston cavity and the outer wall of the piston seat, and the first guide structure can guide the piston seat to move relative to the piston housing; and / or A second guide structure is provided between the cavity wall of the sliding cavity and the outer wall of the piston head, and the second guide structure can guide the piston head to move relative to the piston seat.

5. The protector testing device according to claim 1, characterized in that: A sealing ring is provided between the cavity wall of the piston cavity and the outer wall of the piston seat; and / or A one-way valve is provided in the injection channel; and / or The piston housing is provided with a pressure relief structure which is in communication with the piston chamber.

6. The protector testing device according to claim 2, characterized in that: It also includes a first connecting component, which is accommodated in the accommodating chamber, one end of which is connected to the piston housing, and the other end of which is used to connect to one of the protectors; and / or It also includes a second connecting component, which is accommodated in the accommodating cavity, one end of the second connecting component is connected to the piston head, and the other end of the second connecting component is used to connect to another protector.

7. The protector testing device according to any one of claims 2 to 4, characterized in that: It also includes a first connecting shaft and a first coupling, wherein two ends of the first connecting shaft are respectively connected to the piston housing and the first coupling, and an end of the first coupling away from the first connecting shaft is used to connect to a central shaft of one of the protectors; and / or It also includes a second connecting shaft and a second coupling, wherein two ends of the second connecting shaft are respectively connected to the piston head and the second coupling, and one end of the second coupling away from the second connecting shaft is used to connect to the middle shaft of another protector.

8. The protector testing device according to any one of claims 2 to 4, characterized in that: It also includes a first connecting shaft and a first connecting flange, wherein the first connecting flange is received and fixed in the accommodating cavity, and the first connecting flange is sleeved outside the first connecting shaft, one end of the first connecting shaft is connected to the piston shell, the other end of the first connecting shaft is used to connect to the middle axis of one of the protectors, and the end of the first connecting flange away from the piston shell is used to connect to the outer shell of one of the protectors; and / or It also includes a second connecting shaft and a second connecting flange, the second connecting flange is accommodated and fixed in the accommodating cavity, and the second connecting flange is sleeved outside the second connecting shaft, one end of the second connecting shaft is connected to the piston head, and the other end of the second connecting shaft is used to connect to the central axis of another protector, and the end of the second connecting flange facing away from the piston head is used to connect to the outer shell of another protector.

9. The protector testing device according to any one of claims 2 to 4, characterized in that: It also includes a first connecting shaft, a first coupling, a first connecting flange and a first fastener, wherein the two ends of the first connecting shaft are respectively connected to the piston housing and the first coupling, the first connecting flange is received and fixed in the accommodating cavity, and the first connecting flange is sleeved outside the first connecting shaft, an end of the first coupling away from the first connecting shaft is used to connect to the central axis of one of the protectors, and the first fastener is used to connect the first connecting flange and the outer shell of one of the protectors; and / or It also includes a second connecting shaft, a second coupling, a second connecting flange and a second fastener, the two ends of the second connecting shaft are respectively connected to the piston head and the second coupling, the second connecting flange is accommodated and fixed in the accommodating cavity, and the second connecting flange is sleeved outside the second connecting shaft, the end of the second coupling facing away from the second connecting shaft is used to connect to the central axis of another protector, and the second fastener is used to connect the second connecting flange and the outer shell of the other protector.

10. A testing system, characterized in that: include: The protector testing device according to any one of claims 1 to 9; A fluid pump connected to the injection channel of the protector test device, the fluid pump is used to input fluid into the piston chamber of the protector test device through the injection channel; A rotary drive is used to apply torque to the two protectors.

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