Water level monitoring device with early warning function

Abstract

The application belongs to the technical field of water level monitoring equipment, and specifically discloses a water level monitoring device with a warning function, which comprises a mounting rod, one end of the mounting rod is fixedly connected with a mounting block, a through hole is formed in the surface of the mounting block, and a monitoring mechanism is arranged in the through hole; the monitoring mechanism comprises a sliding rod which is slidingly connected in the through hole, the lower end of the sliding rod penetrates out of the mounting block and is fixedly connected with a first float, and the top of the first float is fixedly connected with a plug block; by arranging the monitoring mechanism and adopting the sectional monitoring design, the first float is used to drive the sliding rod to perform initial monitoring, and the second float is used to perform relay monitoring after the limit is removed, so that the problem that the monitoring rod of the traditional device in a large water level difference water area is too long and is prone to bending deformation under the impact of water flow is effectively solved. The overall structure of the device is more compact and rigid, so that the measurement accuracy and long-term stability of the device in the whole water level change range are ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of water level monitoring equipment, and specifically discloses a water level monitoring device with an early warning function. Background Technology

[0002] Water level monitoring is a crucial component in hydrological observation, flood control and disaster reduction, water resource management, and engineering safety. Traditional water level monitoring devices typically employ fixed scales, float-type water level gauges, or pressure sensors. Among these, float-type water level gauges are simple in structure and low in cost, making them widely used for water level monitoring in various types of water bodies.

[0003] However, in water bodies with large water level differences (such as reservoirs, riverbanks, and flood storage areas), traditional water level gauges often require long guide rods or measuring rods to cover the entire water level fluctuation range. This not only increases the size of the equipment and the difficulty of installation, but also significantly increases the impact force of the water flow on the longer rod when the water level rises and the flow velocity increases. This can easily lead to bending, vibration, or even damage to the rod, seriously affecting the accuracy of the monitoring data and the service life of the equipment.

[0004] Therefore, those skilled in the art have proposed a water level monitoring device with an early warning function to solve the problems mentioned above. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to propose a water level monitoring device with an early warning function, so as to solve the problem that the existing traditional water level gauges require a long measuring rod in waters with large water level differences, and the rod is easily damaged when the water level rises and the flow velocity increases, resulting in inaccurate monitoring accuracy.

[0006] To achieve the above objectives, the present invention provides a water level monitoring device with an early warning function, including a mounting rod, one end of which is fixedly connected to a mounting block, and a through hole is formed on the surface of the mounting block, and a monitoring mechanism is disposed in the through hole;

[0007] The monitoring mechanism includes a sliding rod slidably connected inside the through hole. The lower end of the sliding rod passes through the mounting block and is fixedly connected to a first float. The top of the first float is fixedly connected to an insert block. The upper end of the sliding rod passes through the mounting block and is provided with a second float. The surface of the mounting block is provided with an adjustment component, and the surface of the second float is provided with an indicator component.

[0008] In the above technical solution, preferably, the adjusting component includes a slot formed at the bottom of the mounting block, the slot matching the insert block, a pressure ring slidably connected to the inner wall of the slot, a storage cavity formed inside the mounting block, a compression ring slidably connected to the inner wall of the storage cavity, a uniformly distributed sliding rod fixedly connected to the bottom of the compression ring, the lower end of the sliding rod penetrating through the mounting block and fixedly connected to the top of the pressure ring, and hydraulic oil filling the space between the top of the compression ring and the interior of the storage cavity.

[0009] In the above technical solution, preferably, the top of the mounting block is provided with a mounting groove, the interior of the mounting block is provided with evenly distributed connecting cavities, the inner wall of the connecting cavity is slidably connected with an adjusting plate, one side of the adjusting plate is fixedly connected to the interior of the connecting cavity with a first spring, the other side of the adjusting plate is connected to the interior of the connecting cavity to form an adjusting cavity, the surface of the adjusting plate is fixedly connected with a connecting rod, the inner wall of the mounting groove is provided with a receiving groove that matches the limiting groove, and the other end of the connecting rod passes through the adjusting cavity and the receiving groove in sequence and is fixedly connected to the limiting block.

[0010] In the above technical solution, preferably, the mounting block is provided with uniformly distributed conduits, one end of the conduits is connected to the storage cavity, and the other end of the conduits is connected to the adjacent adjustment cavity.

[0011] In the above technical solution, preferably, the bottom of the second float is fixedly connected to a fixing ring that matches the mounting groove, and the surface of the fixing ring is provided with uniformly distributed limiting grooves that match the limiting block.

[0012] In the above technical solution, preferably, the surface of the slide bar is provided with uniformly distributed infrared receivers, and the inner side of the fixing ring is provided with an infrared transmitter that works in conjunction with the infrared receivers.

[0013] In the above technical solution, preferably, the indicating component includes an impeller disposed at the bottom of the first float, a rotating shaft fixedly connected to the upper end of the impeller, the upper end of the rotating shaft passing through the first float and the slide rod in sequence and rotatably connected to the inner wall of the slide rod, a trigger cavity is provided inside the insert block, a trigger rod is slidably connected to the inner wall of the trigger cavity, and the upper end of the trigger rod passes through the insert block.

[0014] In the above technical solution, preferably, a rotating rod is provided at the top of the first float, an indicator flag is fixedly connected to the surface of the rotating rod, the lower end of the rotating rod passes through the first float and the slide rod in sequence and is rotatably connected to the inner wall of the slide rod, a cavity is opened at the bottom of the rotating rod, the upper end of the rotating shaft extends into the cavity, the diameter of the rotating shaft is smaller than the inner diameter of the cavity, and a drive plate located inside the cavity is fixedly connected to the surface of the rotating shaft.

[0015] In the above technical solution, preferably, the inner wall of the slide rod is fixedly connected to a connecting ring that is rotatably connected to the bottom of the rotating rod, the inside of the rotating rod is provided with a sliding cavity, the inner wall of the sliding cavity is slidably connected to a driving rod, the inner wall of the cavity is provided with a through hole that communicates with the sliding cavity, and the through hole is coaxially arranged with the driving rod, and a second spring is fixedly connected between the surface of the driving rod and the inner wall of the sliding cavity.

[0016] In the above technical solution, preferably, the top of the connecting ring is provided with an inlet channel communicating with the sliding cavity, the bottom of the connecting ring is provided with a connecting channel communicating with the inlet channel, the other end of the connecting channel is connected with the trigger cavity, and the interior of the trigger cavity and the connecting channel are both filled with hydraulic oil.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting up a monitoring mechanism and adopting a segmented monitoring design, the first float drives the sliding rod for initial monitoring, and the second float takes over monitoring after the limit is released. This effectively solves the problem of excessively long monitoring rods required by traditional devices in waters with large water level differences, which are easily bent and deformed by water flow impact. The overall structure of the device is more compact and more rigid, thus ensuring measurement accuracy and long-term stability of the equipment across the entire water level variation range.

[0019] 2. The device integrates a dual early warning mechanism of remote threshold alarm and on-site dynamic warning. It can not only achieve remote intelligent monitoring and alarm through wireless transmission, but also automatically trigger the hydraulic mechanism when the water level rises to a critical stage, unlocking and using the kinetic energy of the water to drive the indicator flag to rotate, providing on-site personnel with a conspicuous and intuitive visual warning without the need for an external power source, greatly improving the timeliness and reliability of the warning. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of the present invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of the mounting block of the present invention;

[0023] Figure 4 This is a schematic diagram showing the connection between the first float, the second float, and the sliding rod of the present invention;

[0024] Figure 5 This is a schematic diagram showing the distribution of the insert block, the second float, and the impeller of the present invention;

[0025] Figure 6 for Figure 5 Enlarged view of A in the middle;

[0026] Figure 7 This is a schematic diagram showing the connection between the first float and the sliding rod of the present invention;

[0027] Figure 8 for Figure 7 Enlarged view of B in the middle;

[0028] Figure 9 This is a schematic diagram showing the distribution of the infrared emitter and the limiting groove of the present invention.

[0029] In the diagram: 1. Mounting rod; 2. Mounting block; 3. Monitoring mechanism; 301. Sliding rod; 302. First float; 303. Second float; 304. Infrared receiver; 305. Infrared transmitter; 306. Insert block; 31. Adjustment assembly; 3101. Limiting block; 3102. Connecting rod; 3103. First spring; 3104. Connecting cavity; 3105. Adjusting plate; 3106. Slot; 3107. Storage cavity; 3108. Compression ring; 31 09. Pressure ring; 3110. Sliding rod; 3111. Fixing ring; 3112. Limiting groove; 3113. Guide tube; 32. Indicating assembly; 3201. Impeller; 3202. Rotating shaft; 3203. Trigger rod; 3204. Trigger chamber; 3205. Connecting channel; 3206. Rotating rod; 3207. Indicating flag; 3208. Drive plate; 3209. Connecting ring; 3210. Second spring; 3211. Drive rod; 3212. Cavity. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0032] like Figures 1-9 The water level monitoring device with early warning function shown includes a mounting rod 1, one end of which is fixedly connected to a mounting block 2. A through hole is opened on the surface of the mounting block 2, and a monitoring mechanism 3 is installed in the through hole.

[0033] The monitoring mechanism 3 includes a slide rod 301 slidably connected inside the through hole. The lower end of the slide rod 301 passes through the mounting block 2 and is fixedly connected to a first float 302. The top of the first float 302 is fixedly connected to an insert block 306. The upper end of the slide rod 301 passes through the mounting block 2 and is provided with a second float 303. An adjustment component 31 is provided on the surface of the mounting block 2, and an indicator component 32 is provided on the surface of the second float 303.

[0034] Specifically, the other end of the mounting rod 1 is provided with an expansion bolt for installation. The expansion bolt is used to fix it near the wall where water level detection is required, and the wall is sealed to prevent corrosion from affecting it.

[0035] During installation, it is important to place the end with the first float 302 closer to the water surface. The position of the first float 302 can be adjusted by using buoyancy through changes in water level, thereby synchronously moving the slide bar 301.

[0036] like Figures 1-9 As shown, the adjustment component 31 includes a slot 3106 opened at the bottom of the mounting block 2. The slot 3106 matches the insert block 306. A pressure ring 3109 is slidably connected to the inner wall of the slot 3106. A storage cavity 3107 is opened inside the mounting block 2. A compression ring 3108 is slidably connected to the inner wall of the storage cavity 3107. A uniformly distributed sliding rod 3110 is fixedly connected to the bottom of the compression ring 3108. The lower end of the sliding rod 3110 passes through the mounting block 2 and is fixedly connected to the top of the pressure ring 3109. Hydraulic oil is filled between the top of the compression ring 3108 and the inside of the storage cavity 3107.

[0037] The top of the mounting block 2 is provided with a mounting groove, and the interior of the mounting block 2 is provided with evenly distributed connecting cavities 3104. An adjusting plate 3105 is slidably connected to the inner wall of the connecting cavity 3104. A first spring 3103 is fixedly connected between one side of the adjusting plate 3105 and the interior of the connecting cavity 3104. An adjusting cavity is formed between the other side of the adjusting plate 3105 and the interior of the connecting cavity 3104. A connecting rod 3102 is fixedly connected to the surface of the adjusting plate 3105. The inner wall of the mounting groove is provided with a storage groove that matches the limiting groove 3112. The other end of the connecting rod 3102 passes through the adjusting cavity and the storage groove in sequence and is fixedly connected to the limiting block 3101.

[0038] The mounting block 2 has evenly distributed conduits 3113 inside. One end of the conduit 3113 is connected to the storage cavity 3107, and the other end of the conduit 3113 is connected to the adjacent adjustment cavity.

[0039] The bottom of the second float 303 is fixedly connected to a fixing ring 3111 that matches the mounting groove. The surface of the fixing ring 3111 is provided with evenly distributed limiting grooves 3112 that match the limiting block 3101.

[0040] The surface of the slide bar 301 is provided with evenly distributed infrared receivers 304, and the inner side of the fixing ring 3111 is provided with an infrared transmitter 305 that works in conjunction with the infrared receivers 304.

[0041] When the device is installed near a water surface with a large water level difference, during the process of water level rise, the buoyancy of the first float 302 drives the slide bar 301 to move upward along the through hole. During this process, the limiting block 3101 is kept inserted into the limiting groove 3112 under the action of the first spring 3103, thereby limiting the position of the fixing ring 3111, and thus limiting the position of the second float 303, preventing its position from deviating and affecting the subsequent detection effect. At the same time, during the movement of the slide bar 301, the height of water level rise can be detected by the cooperation of the evenly distributed infrared receiver 304 and the infrared transmitter 305.

[0042] Furthermore, the device is equipped with a wireless transmission module and a remote receiving interrupt, which uses the signal transmission detected by the infrared receiver 304 to remotely determine water level changes and to issue an alarm when the water level reaches a preset threshold.

[0043] As the water level rises, the first float 302 causes the insert block 306 to be inserted into the slot 3106. During this process, the insert block 306 pushes the pressure ring 3109 upward along the inner wall of the slot 3106, and through the sliding rod 3110, it drives the compression ring 3108 to compress the hydraulic oil stored in the storage cavity 3107. This allows the hydraulic oil to be injected into the regulating cavity through the conduit 3113, thereby pushing the regulating plate 3105 to compress the first spring 3103 and through the limiting block 3101 on the connecting rod 3102 to retract into the receiving groove and separate from the limiting groove 3112. At this time, the limiting effect on the second float 303 is released. As a result, during the upward movement of the first float 302, the sliding rod 301 can gradually pass through the second float 303. After the water level exceeds the height of the mounting block 2, the second float 303 is pushed to continue moving upward along the surface of the sliding rod 301. During the upward movement of the second float 303, the infrared receiver 304 moves synchronously, working with the infrared transmitter 305 on the sliding rod 301 to perform the second stage of monitoring. This method can reduce the installation volume in waters with large water level differences, avoiding the situation where the traditional method requires a tall detection rod in waters with large water level differences, which causes the detection rod to bend due to the large pressure of the water flow during the rise of the water level, thus affecting the detection accuracy.

[0044] like Figures 1-9 As shown, the indicator component 32 includes an impeller 3201 disposed at the bottom of the first float 302. The upper end of the impeller 3201 is fixedly connected to a rotating shaft 3202. The upper end of the rotating shaft 3202 passes through the first float 302 and the slide rod 301 in sequence and is rotatably connected to the inner wall of the slide rod 301. A trigger cavity 3204 is opened inside the insert block 306. A trigger rod 3203 is slidably connected to the inner wall of the trigger cavity 3204. The upper end of the trigger rod 3203 passes through the insert block 306.

[0045] A rotating rod 3206 is provided at the top of the first float 302. An indicator flag 3207 is fixedly connected to the surface of the rotating rod 3206. The lower end of the rotating rod 3206 passes through the first float 302 and the slide rod 301 in sequence and is rotatably connected to the inner wall of the slide rod 301. A cavity 3212 is opened at the bottom of the rotating rod 3206. The upper end of the rotating shaft 3202 extends into the cavity 3212. The diameter of the rotating shaft 3202 is smaller than the inner diameter of the cavity 3212. A drive plate 3208 located inside the cavity 3212 is fixedly connected to the surface of the rotating shaft 3202.

[0046] A connecting ring 3209 is fixedly connected to the inner wall of the slide rod 301 and rotatably connected to the bottom of the rotating rod 3206. A sliding cavity is opened inside the rotating rod 3206. A driving rod 3211 is slidably connected to the inner wall of the sliding cavity. A through hole is opened on the inner wall of the cavity 3212 and communicates with the sliding cavity. The through hole is coaxially arranged with the driving rod 3211. A second spring 3210 is fixedly connected between the surface of the driving rod 3211 and the inner wall of the sliding cavity.

[0047] The top of the connecting ring 3209 is provided with an inlet channel that communicates with the sliding cavity, and the bottom of the connecting ring 3209 is provided with a connecting channel 3205 that communicates with the inlet channel. The other end of the connecting channel 3205 is connected to the trigger cavity 3204. Both the trigger cavity 3204 and the connecting channel 3205 are filled with hydraulic oil.

[0048] The impeller 3201 is designed to rotate during water flow, thereby causing the shaft 3202 to rotate synchronously. When the water level is only high enough to trigger the first float 302, the drive rod 3211 is retracted into the sliding cavity by the second spring 3210. At this time, the shaft 3202 rotates freely inside the cavity 3212 and does not drive the rotating rod 3206 to rotate. The rotation continues until the water level rises, causing the first float 302 to move upwards and the insert block 306 to insert into the slot 3106, which in turn pushes the trigger rod 3203 to be damaged. Inside the triggering chamber 3204, during this process, the hydraulic oil inside the triggering chamber 3204 and the connecting channel 3205 can be squeezed and injected into the sliding chamber through the inlet channel. This can then push the drive rod 3211 from inside the sliding chamber through the through hole to the inside of the cavity 3212. At this time, when the rotating shaft 3202 rotates, it can push the drive rod 3211 to rotate through the drive plate 3208, thereby driving the rotating rod 3206 to rotate. This can then drive the indicator flag 3207 to rotate, so that people around the water area can judge that the water level has risen too high and should stay away.

[0049] Working principle: The other end of the mounting rod 1 is equipped with an expansion bolt for installation. The rod is fixed near the wall where water level detection is required and sealed. During water level rise, the buoyancy of the first float 302 drives the sliding rod 301 upwards along the through hole. During this process, the limiting block 3101, under the action of the first spring 3103, keeps it inserted into the limiting groove 3112, thus limiting the position of the fixing ring 3111. This, in turn, limits the position of the second float 303, preventing its positional deviation from affecting subsequent detection. Simultaneously, during the movement of the sliding rod 301, the evenly distributed infrared receiver 304 and infrared transmitter 305 work together to detect the water level rise. When the water level only triggers the first float 302, the driving rod 3211 is activated by the second spring 3210. Under the action of the mechanism, the water level causes the water to retract inside the sliding cavity. At this time, the rotating shaft 3202 will rotate freely inside the cavity 3212 and will not drive the rotating rod 3206 to rotate. Until the water level rises and causes the first float 302 to move upward, the insert block 306 is inserted into the slot 3106. During this process, the trigger rod 3203 is pushed into the trigger cavity 3204. In this process, the hydraulic oil inside the trigger cavity 3204 and the connecting channel 3205 is squeezed and injected into the sliding cavity through the inlet channel. This pushes the drive rod 3211 from the inside of the sliding cavity through the through hole to the inside of the cavity 3212. When the rotating shaft 3202 rotates, it can push the drive rod 3211 to rotate through the drive plate 3208, which in turn drives the rotating rod 3206 to rotate. This enables the indicator flag 3207 to rotate, so that people around the water area can judge that the water level has risen too high and should stay away.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A water level monitoring device with early warning function, comprising a mounting rod (1), characterized in that, One end of the mounting rod (1) is fixedly connected with a mounting block (2), a through hole is formed in the surface of the mounting block (2), and a monitoring mechanism (3) is arranged in the through hole. The monitoring mechanism (3) comprises a sliding rod (301) slidably connected in the through hole, the lower end of the sliding rod (301) penetrates out of the mounting block (2) and is fixedly connected with a first float (302), the top of the first float (302) is fixedly connected with a plug block (306), the upper end of the sliding rod (301) penetrates out of the mounting block (2) and is provided with a second float (303), the surface of the mounting block (2) is provided with an adjusting assembly (31), and the surface of the second float (303) is provided with an indicating assembly (32). The adjusting assembly (31) comprises a plug groove (3106) formed in the bottom of the mounting block (2), the plug groove (3106) is matched with the plug block (306), a pressure receiving ring (3109) is slidably connected to the inner wall of the plug groove (3106), a storage cavity (3107) is formed in the mounting block (2), a pressing ring (3108) is slidably connected to the inner wall of the storage cavity (3107), the bottom of the pressing ring (3108) is fixedly connected with uniformly distributed sliding rods (3110), the lower end of the sliding rod (3110) penetrates out of the mounting block (2) and is fixedly connected with the top of the pressure receiving ring (3109), and the top of the pressing ring (3108) is filled with hydraulic oil in the storage cavity (3107). The top of the mounting block (2) is provided with a mounting groove, the inside of the mounting block (2) is provided with uniformly distributed connecting cavities (3104), the inner wall of the connecting cavity (3104) is slidably connected with an adjusting plate (3105), the first spring (3103) is fixedly connected between one side of the adjusting plate (3105) and the inside of the connecting cavity (3104), the adjusting cavity is formed between the other side of the adjusting plate (3105) and the inside of the connecting cavity (3104), the connecting rod (3102) is fixedly connected to the surface of the adjusting plate (3105), the inner wall of the mounting groove is provided with a receiving groove matched with the limiting groove (3112), and the other end of the connecting rod (3102) penetrates out of the adjusting cavity and the receiving groove in sequence and is fixedly connected with a limiting block (3101). The inside of the mounting block (2) is provided with uniformly distributed conduits (3113), one end of the conduit (3113) is communicated with the storage cavity (3107), and the other end of the conduit (3113) is communicated with the adjacent adjusting cavity. The bottom of the second float (303) is fixedly connected with a fixing ring (3111) matched with the mounting groove, and the surface of the fixing ring (3111) is provided with uniformly distributed limiting grooves (3112) matched with the limiting block (3101).

2. The water level monitoring device with early warning function according to claim 1, characterized in that, The surface of the sliding rod (301) is provided with uniformly distributed infrared receivers (304), and the inner side of the fixing ring (3111) is provided with infrared emitters (305) matched with the infrared receivers (304).

3. The water level monitoring device with early warning function according to claim 1, characterized in that, The indicating component (32) comprises an impeller (3201) arranged at the bottom of the first floating body (302), the upper end of the impeller (3201) is fixedly connected with a rotating shaft (3202), the upper end of the rotating shaft (3202) penetrates the first floating body (302) and the sliding rod (301) in sequence and is rotationally connected with the inner wall of the sliding rod (301), the inside of the plug-in block (306) is provided with a trigger cavity (3204), the inner wall of the trigger cavity (3204) is slidably connected with a trigger rod (3203), and the upper end of the trigger rod (3203) penetrates the plug-in block (306).

4. The water level monitoring device with early warning function according to claim 3, characterized in that, The top of the first floating body (302) is provided with a rotating rod (3206), the surface of the rotating rod (3206) is fixedly connected with an indicating flag (3207), the lower end of the rotating rod (3206) penetrates the first floating body (302) and the sliding rod (301) in sequence and is rotationally connected with the inner wall of the sliding rod (301), the bottom of the rotating rod (3206) is provided with a cavity (3212), the upper end of the rotating shaft (3202) extends into the cavity (3212), the diameter of the rotating shaft (3202) is smaller than the inner diameter of the cavity (3212), and the surface of the rotating shaft (3202) is fixedly connected with a driving plate (3208) arranged in the cavity (3212).

5. The water level monitoring device with early warning function according to claim 4, characterized in that, The inner wall of the sliding rod (301) is fixedly connected with a connecting ring (3209) rotationally connected with the bottom of the rotating rod (3206), the inside of the rotating rod (3206) is provided with a sliding cavity, the inner wall of the sliding cavity is slidably connected with a driving rod (3211), the inner wall of the cavity (3212) is provided with a through hole in communication with the sliding cavity, and the through hole is coaxially arranged with the driving rod (3211), and the surface of the driving rod (3211) is fixedly connected with a second spring (3210) between the inner wall of the sliding cavity.

6. The water level monitoring device with early warning function according to claim 5, characterized in that, The top of the connecting ring (3209) is provided with an import channel in communication with the sliding cavity, the bottom of the connecting ring (3209) is provided with a connecting channel (3205) in communication with the import channel, the other end of the connecting channel (3205) is in communication with the trigger cavity (3204), and the interiors of the trigger cavity (3204) and the connecting channel (3205) are filled with hydraulic oil.

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