# US 12,006,955 B2 · Anti-loosening device and plunger pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,955 B2 - Document ID: US12006955B2 - Status: Granted - Kind: B2 - Application number: 17/217,507 - Filed: 2021-03-30 - Published: 2022-07-28 - Granted: 2024-06-11 - Earliest claimed: 2021-01-27 - Assignees: Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. - Applicants: Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. - Inventors: Chen Jiang; Xiaosong Wei; Xiaobin Li; Haiping Cui - Web page: https://patentgrep.com/patent/US12006955B2 ## CPC - F04B 53/00: Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00 - F15B 15/262: {using friction, e.g. brake pads} - F04B 1/00: Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00) - F16B 2/04: internal, i.e. with spreading action (F16B2/14 - F16B2/18 take precedence) - F16B 39/10: by a plate, {spring, wire} or ring immovable with regard to the bolt or object {and mainly perpendicular to the axis of the bolt}(F16B39/08 takes precedence) - F04B 53/14: Pistons, piston-rods or piston-rod connections - F04B 53/22: Arrangements for enabling ready assembly or disassembly - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) ## Abstract Embodiments of the present disclosure provides an anti-loosening device and a plunger pump. The anti-loosening device includes a first bracket, a second bracket and an elastic member. The first bracket includes a first clamping part defining a first accommodating space; a first connecting part extending in a first direction and fixedly connected to the first clamping part; and a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction. The second bracket includes a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction; and a second connecting part extending in the first direction and fixedly connected to the second clamping part. ## Claims ### Claim 1 An anti-loosening device, comprising: a first bracket, comprising: a first clamping part defining a first accommodating space; a first connecting part extending in a first direction and fixedly connected to the first clamping part; and a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction; and a second bracket, comprising: a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction, and a second connecting part extending in the first direction and fixedly connected to the second clamping part, and an elastic structure connecting the first bracket and the second bracket and configured to control a relative movement of the first bracket and the second bracket in the first direction, wherein the first clamping part is consisted of a first plate-shaped structure and a second plate-shaped structure, the first plate-shaved structure is overlapped with the first connecting part in the first direction, and the second plate-shaped structure is located at an end of the first plate-shaped structure away from the limiting part in the second direction, the second clamping part comprises a third plate-shaped structure, a fourth plate-shaped structure and a fifth plate-shaped structure which are connected to the third plate-shaped structure, in the first direction, the third plate-shaped structure is overlapped with the second connecting part, and in the second direction, the fourth plate-shaped structure is located at an end of the third plate-shaped structure close to the limiting part, and the fifth plate-shaped structure is located at an end of the third plate-shaped structure away from the limiting part. ### Claim 2 (depends on 1) The anti-loosening device according to claim 1, wherein one of the first connecting part and the second connecting part is inserted into the other of the first connecting part and the second connecting part, and the first connecting part is partially overlapped with the second connecting part in the second direction. ### Claim 3 (depends on 2) The anti-loosening device according to claim 2, wherein the first connecting part has a tubular shape, the second connecting part has a pillar shape, and the second connecting part is inserted into the first connecting part. ### Claim 4 (depends on 3) The anti-loosening device according to claim 3, wherein the elastic structure is located inside the first connecting part, and the elastic structure is abutted against the first clamping part and the second connecting part. ### Claim 5 (depends on 4) The anti-loosening device according to claim 4, wherein the elastic structure is a spring. ### Claim 6 (depends on 4) The anti-loosening device according to claim 4, wherein the first connecting part is provided with an opening, the anti-loosening device further comprises a protruding structure which passes through the opening and is detachably connected to the second connecting part, the protruding structure protrudes from an outer surface of the first connecting part along a third direction, and the third direction intersects with the first direction and the second direction. ### Claim 7 (depends on 6) The anti-loosening device according to claim 6, wherein the opening has a strip shape extending in the first direction, and a maximum distance by which the protruding structure is capable of moving in the opening along the first direction is greater than a maximum size of the second clamping part in the first direction. ### Claim 8 (depends on 3) A plunger pump, comprising: a hydraulic end, a fastener rotatable in a locking direction to be installed on a side of the hydraulic end, and a first stay rod and a second stay rod which are fixedly connected to the side of the hydraulic end, wherein the fastener comprises a plurality of positioning holes, the plunger pump further comprises the anti-loosening device according to claim 3, the first clamping part of the anti-loosening device is abutted against the first stay rod so that at least a part of the first stay rod is located in the first accommodating space, the second clamping part of the anti-loosening device is abutted against the second stay rod so that at least a part of the second stay rod is located in the second accommodating space, an end of the limiting part opposite to the first connecting part is inserted into any one of the plurality of positioning holes of the fastener along the second direction, and the elastic structure is in an elastic deformation state. ### Claim 9 (depends on 8) The plunger pump according to claim 8, wherein the first stay rod is located upstream of the second stay rod in the locking direction. ### Claim 10 (depends on 2) A plunger pump, comprising: a hydraulic end, a fastener rotatable in a locking direction to be installed on a side of the hydraulic end, and a first stay rod and a second stay rod which are fixedly connected to the side of the hydraulic end, wherein the fastener comprises a plurality of positioning holes, the plunger pump further comprises the anti-loosening device according to claim 2, the first clamping part of the anti-loosening device is abutted against the first stay rod so that at least a part of the first stay rod is located in the first accommodating space, the second clamping part of the anti-loosening device is abutted against the second stay rod so that at least a part of the second stay rod is located in the second accommodating space, an end of the limiting part opposite to the first connecting part is inserted into any one of the plurality of positioning holes of the fastener along the second direction, and the elastic structure is in an elastic deformation state. ### Claim 11 (depends on 10) The plunger pump according to claim 10, wherein the first stay rod is located upstream of the second stay rod in the locking direction. ### Claim 12 (depends on 10) The plunger pump according to claim 10, wherein in the first direction, the limiting part of the anti-loosening device is located between the first stay rod and the second stay rod. ### Claim 13 (depends on 1) The anti-loosening device according to claim 1, wherein the ng part las a pillar shape. ### Claim 14 (depends on 1) The anti-loosening device according to claim 1, wherein a material of the first bracket and a material of the second bracket are rigid material. ### Claim 15 (depends on 1) A plunger pump, comprising: a hydraulic end, a fastener rotatable in a locking direction to be installed on a side of the hydraulic end, and a first stay rod and a second stay rod which are fixedly connected to the side of the hydraulic end, wherein the fastener comprises a plurality of positioning holes, the plunger pump further comprises the anti-loosening device according to claim 1, the first clamping part of the anti-loosening device is abutted against the first stay rod so that at least a part of the first stay rod is located in the first accommodating space, the second clamping part of the anti-loosening device is abutted against the second stay rod so that at least a part of the second stay rod is located in the second accommodating space, an end of the limiting part opposite to the first connecting part is inserted into any one of the plurality of positioning holes of the fastener along the second direction, and the elastic structure is in an elastic deformation state. ### Claim 16 (depends on 15) The plunger pump according to claim 15, wherein the first stay rod is located upstream of the second stay rod in the locking direction. ### Claim 17 (depends on 15) The plunger pump according to claim 15, wherein in the first direction, the limiting part of the anti-loosening device is located between the first stay rod and the second stay rod. ### Claim 18 (depends on 15) The plunger pump according to claim 15, further comprising a plunger movably connected to the hydraulic end, the fastener being a packing nut arranged coaxially with the plunger.