Metering chamber structure of rotary piston type water meter

Abstract

The utility model discloses a metering chamber structure of a rotary piston type water meter, which comprises a shell and a cover plate, a piston cavity is formed between the shell and the cover plate, a piston is arranged in the piston cavity, a water inlet is arranged at the bottom of the shell, a water outlet is arranged on the cover plate, a poke rod is rotatably arranged in the center of the cover plate, and the upper end of the poke rod is connected with a shifting fork. The hydraulic cylinder is characterized in that the piston comprises a spherical piston body, a piston core shaft is arranged on the lower portion of the piston body, a rotating concave cavity is formed in the center of the bottom of the piston cavity in a downwards-sunken mode, the piston core shaft is rotatably arranged in the rotating concave cavity, and blocking blades are arranged on the two opposite side portions of the piston body respectively. The ends of the two blocking blades make contact with the inner side wall of the piston cavity to divide the piston cavity into an upper cavity and a lower cavity which are independent of each other, one blocking blade is provided with a water inlet through hole, and the lower end of the poke rod is fixedly connected with the piston body. The utility model has the advantages that the structure is simple, the pressure loss is small, and the noise is relatively small in the use process.

Description

Technical Field

[0001] The utility model relates to a water meter, in particular to a metering chamber structure of a rotary piston type water meter. Background Art

[0002] The rotary piston water meter is the most complex in structure, the most difficult to manufacture, and the highest in metering grade among all kinds of water meter products. The metering chamber structure in the common rotary piston water meter is mainly composed of three parts: the metering chamber shell, the rotary piston, and the cover plate. Its working principle is to rely on the volume of the metering chamber for measurement. Under the action of the differential pressure of water and different flow rates, the piston in the metering chamber generates a rotation torque and performs an eccentric rotation motion, forming a corresponding rotation speed, and the number of revolutions is recorded by a counting mechanism, thereby obtaining a measurable water flow rate. The Chinese utility model patent with patent number 200920113248.3 discloses a rotary piston water meter metering chamber structure, which includes a shell, a piston arranged in the piston cavity of the shell, and a cover plate sealed and positioned and connected to the top of the shell. The metering chamber of this structure is relatively complex, and in this structure, the contact area between the piston and the inner wall of the piston cavity of the outer shell is large, resulting in greater friction between the piston and the inner wall of the piston cavity of the outer shell during rotation. The greater the friction, the greater the driving force required, the greater the pressure loss, and the greater the wear between the two. In addition, the noise generated by the large area contact is also greater. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a metering chamber structure of a rotary piston type water meter which has a simple structure, small pressure loss and small noise during use.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A metering chamber structure of a rotary piston water meter, comprising a shell and a sealing cover, a cover plate arranged on the shell, a piston cavity formed between the shell and the cover plate, a piston rotatably arranged in the piston cavity, a water inlet arranged at the bottom of the shell, a water outlet arranged on the cover plate, the water inlet and the water outlet are respectively connected to the piston cavity, a toggle rod is rotatably mounted at the center of the cover plate, a toggle rod is connected to the upper end of the toggle rod with a toggle fork for toggling a counting mechanism, the piston comprises a spherical piston body, a piston core shaft is arranged at the lower part of the piston body, the The central axis of the piston core shaft passes through the spherical center of the piston body, and a rotating cavity is arranged downwardly at the bottom center position of the piston cavity. The piston core shaft is rotatably arranged in the rotating cavity, and the two opposite sides of the piston body are respectively provided with baffle blades, and the ends of the two baffle blades are in contact with the inner wall of the piston cavity to separate the piston cavity into an upper chamber and a lower chamber independent of each other, and one of the baffle blades is provided with a water inlet hole for connecting the upper chamber with the lower chamber, and the lower end of the toggle rod is fixedly connected to the piston body.

[0006] The two barrier blades are arranged one above and one below, the barrier blade located at the upper position is the upper barrier blade, and the barrier blade located at the lower position is the lower barrier blade, the water inlet hole is arranged on the lower barrier blade, the upper barrier blade is an arc-shaped blade with a downward depression in the middle, and the lower barrier blade is an arc-shaped blade with an upward protrusion in the middle.

[0007] A bushing is arranged at the center of the bottom of the piston cavity, and the center of the bushing has the rotating cavity which is recessed downward.

[0008] The piston core shaft is a stainless steel core shaft.

[0009] A wear-resistant block is embedded in the bottom of the rotating cavity, the bottom of the piston core shaft is a cone, and the bottom end of the cone is against the wear-resistant block.

[0010] The wear-resistant block is made of corundum.

[0011] The central depression of the wear-resistant block is provided with a depression portion for realizing the bottom positioning and abutment installation of the piston core shaft.

[0012] The water inlet and the water outlet are arranged diagonally.

[0013] Compared with the prior art, the advantages of the utility model are: simple structure, the piston body is a spherical structure, flexible rotation, small pressure resistance, the baffle blades arranged on the two opposite sides of the piston body are in contact with the inner wall of the piston cavity, the contact area is small, and the friction between them is relatively small, which makes the overall pressure loss small, and the noise during use is also relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model in a closed state;

[0015] Figure 2 for Figure 1 A schematic cross-sectional view of the structure with the piston and the toggle rod removed;

[0016] Figure 3 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0017] Figure 4 It is a partial cross-sectional structural schematic diagram of the piston in the utility model. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] As shown in the figure, a metering chamber structure of a rotary piston water meter includes a shell 1 and a cover plate 2 with a sealing cover arranged on the shell 1, a piston chamber 10 is formed between the shell 1 and the cover plate 2, a piston 3 is rotatably arranged in the piston chamber 10, a water inlet 11 is arranged at the bottom of the shell 1, a water outlet 21 is arranged on the cover plate 2, the water inlet 11 and the water outlet 21 are respectively connected to the piston chamber 10, a toggle rod 4 is rotatably installed at the center of the cover plate 2, a toggle rod 4 is connected to the upper end of the toggle rod 4 with a fork 41 for toggling the counting mechanism, the piston 3 includes a spherical piston body 301, a piston core shaft 302 is arranged at the lower part of the piston body 301, and the piston core The central axis of the shaft 302 passes through the center of the piston body 301. A rotating cavity 12 is recessed downward at the bottom center of the piston chamber 10. The piston core shaft 302 is rotatably arranged in the rotating cavity 12. The two opposite sides of the piston body 301 are respectively provided with baffle blades. The ends of the two baffle blades are in contact with the inner wall of the piston chamber 10 to separate the piston chamber 10 into an upper chamber 101 and a lower chamber 102 that are independent of each other. One of the baffle blades is provided with a water inlet hole 31 for connecting the upper chamber 101 with the lower chamber 102. The lower end of the toggle rod 4 is fixedly connected to the piston body 301.

[0020] Specifically, two baffle blades are arranged one above and one below, the baffle blade at the upper position is the upper baffle blade 303, and the baffle blade at the lower position is the lower baffle blade 304. The water inlet hole 31 is arranged on the lower baffle blade 304. The upper baffle blade 303 is an arc-shaped blade with a downward depression in the middle, and the lower baffle blade 304 is an arc-shaped blade with an upward protrusion in the middle. The baffle blades are arranged one above and one below, so that the piston chamber 10 forms two chambers of the same volume, and both are arc-shaped blades, which can play a role of bypass flow during the rotation process, further reducing resistance.

[0021] Specifically, a bushing 100 is provided at the bottom center of the piston cavity 10, and the center of the bushing 100 has a downwardly recessed rotation cavity 12. The use of the bushing 100 can reduce the wear, vibration and noise of the piston core shaft 302 during the rotation process, and the bushing 100 plays a certain role in limiting the piston core shaft 302 during the rotation process.

[0022] Specifically, the piston core shaft 302 is a stainless steel core shaft, which has high sensitivity and relatively lower noise, and can effectively improve the accuracy.

[0023] Specifically, a wear-resistant block 121 is embedded in the bottom of the rotating cavity 12, and the bottom of the piston core shaft 302 is a cone 305, and the bottom end of the cone 305 is against the wear-resistant block 121. The wear-resistant block 121 is used to improve the service life and performance level of the water meter; the bottom of the piston core shaft 302 is a cone 305, so that the bottom of the piston core shaft 302 and the wear-resistant block 121 are in point contact, with a small contact area, low noise, and improved overall sensitivity.

[0024] Specifically, the wear-resistant block 121 is made of corundum, and the friction coefficient between the wear-resistant block 121 made of corundum and the stainless steel mandrel is small, which can effectively reduce noise.

[0025] Specifically, the central depression of the wear-resistant block 121 is provided with a depression portion 1211 for realizing the bottom positioning and abutment installation of the piston core shaft 302 .

[0026] Specifically, the water inlet 11 and the water outlet 21 are arranged diagonally.

[0027] Water flows into the lower chamber 102 from the water inlet 11, impacts the piston body 301's own barrier blades, and causes the piston 3 to rotate. Part of the water flows into the upper chamber 101 from the water inlet hole 31 on the lower barrier blade 304, and is pushed by the upper barrier blade 303 to flow out from the water outlet 21. During the rotation process, the piston 3 drives the toggle rod 4 connected thereto to rotate, driving the fork 41 on the toggle rod 4 to toggle the counting mechanism to realize counting.

[0028] It is worth noting that the above is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. The utility model can also improve the materials and structures of the above-mentioned various parts, or replace them with technical equivalents. Therefore, all equivalent structural changes made by using the description and illustrations of the utility model, or directly or indirectly applied to other related technical fields are also included in the scope of the utility model.

Claims

1. A metering chamber structure of a rotary piston water meter, comprising a housing and a sealing cover, a cover plate arranged on the housing, a piston chamber formed between the housing and the cover plate, a piston rotatably arranged in the piston chamber, a water inlet arranged at the bottom of the housing, a water outlet arranged on the cover plate, the water inlet and the water outlet are respectively connected to the piston chamber, a toggle rod is rotatably mounted at the center of the cover plate, a toggle fork for toggling a counting mechanism is connected to the upper end of the toggle rod, characterized in that The piston includes a spherical piston body, a piston core shaft is provided at the lower part of the piston body, the central axis of the piston core shaft passes through the spherical center of the piston body, a rotating cavity is provided downwardly at the bottom center position of the piston cavity, the piston core shaft is rotatably arranged in the rotating cavity, and the two opposite side parts of the piston body are respectively provided with baffle blades, the ends of the two baffle blades are in contact with the inner wall of the piston cavity to separate the piston cavity into an upper chamber and a lower chamber independent of each other, one of the baffle blades is provided with a water inlet hole for connecting the upper chamber with the lower chamber, and the lower end of the toggle rod is fixedly connected to the piston body.

2. A measuring chamber structure of a rotary piston water meter as claimed in claim 1, characterized in that The two barrier blades are arranged one above and one below, the barrier blade located at the upper position is the upper barrier blade, and the barrier blade located at the lower position is the lower barrier blade, the water inlet hole is arranged on the lower barrier blade, the upper barrier blade is an arc-shaped blade with a downward depression in the middle, and the lower barrier blade is an arc-shaped blade with an upward protrusion in the middle.

3. The measuring chamber structure of a rotary piston water meter according to claim 1, characterized in that A bushing is arranged at the center of the bottom of the piston cavity, and the center of the bushing has the rotating cavity which is recessed downward.

4. A measuring chamber structure of a rotary piston water meter as claimed in claim 1 or 3, characterized in that The piston core shaft is a stainless steel core shaft.

5. A measuring chamber structure of a rotary piston water meter as claimed in claim 4, characterized in that A wear-resistant block is embedded in the bottom of the rotating cavity, the bottom of the piston core shaft is a cone, and the bottom end of the cone is against the wear-resistant block.

6. A measuring chamber structure of a rotary piston water meter as claimed in claim 5, characterized in that The wear-resistant block is made of corundum.

7. A measuring chamber structure of a rotary piston water meter as claimed in claim 5, characterized in that The central depression of the wear-resistant block is provided with a depression portion for realizing the bottom positioning and abutment installation of the piston core shaft.

8. The measuring chamber structure of a rotary piston water meter according to claim 1, characterized in that The water inlet and the water outlet are arranged diagonally.

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