Character wheel shaft liquid seal structure and wet-type water meter counter

Abstract

The utility model discloses a character wheel shaft liquid seal structure and a wet-type water meter counter. The character wheel shaft liquid seal structure comprises an annular sealing groove and an annular sealing ring which is arranged in the annular sealing groove in a filling mode and arranged on a character wheel shaft in a sleeving mode. The sealing ring blocking structure is used for preventing the annular sealing ring from moving out of the annular sealing groove; the annular sealing ring is provided with a radial outer side sealing structure and a radial inner side sealing structure; the sealing structure is characterized in that the radial outer side sealing structure and the radial outer side molded surface of the annular sealing groove are attached and connected to form a sealing surface; the radial inner side sealing structure is matched with the outer surface of the character wheel shaft to form line contact sealing or surface contact sealing; an annular groove in the annular direction of the annular sealing ring is formed in the axial inner side end face of the annular sealing ring. A first axial gap is formed between the part, located on the inner side of the opening of the annular groove in the radial direction, of the axial inner side end face of the annular sealing ring and the groove bottom of the annular sealing groove. According to the utility model, the durable use reliability can be better ensured.

Description

Technical Field

[0001] The utility model belongs to the field of wet water meters, and in particular relates to a wheel shaft liquid seal structure and a wet water meter counter. Background Art

[0002] At present, the common water supply metering instruments are: wet water meter (also known as: rotary vane cold water meter) and liquid-sealed water meter. Compared with liquid-sealed water meter, wet water meter has many advantages such as higher measurement accuracy and longer service life, so it is more widely used.

[0003] Existing wet water meter production process: Currently, most of the industry uses manual water filling, and a few use vacuum water filling technology (see the "Wet Water Meter Dial Vacuum Liquid Sealing Equipment and Technology" mentioned in Publication No.: CN115077653A or CN115077652A). However, the manual water filling method has the disadvantages of low efficiency and high cost; the vacuum water filling process can solve the disadvantages of the manual water filling method, but new technical problems will arise:

[0004] The patent publication number CN102607661A shows the structure of an existing wet water meter counter, in which a shaft sealing ring is mounted on the driving shaft; however, during the vacuum pumping and water filling process of the wet water meter, the liquid originally filled in the character wheel cavity of the wet water meter counter is easily sucked out during the vacuum pumping, causing bubbles to appear inside the wet water meter counter. The appearance of bubbles can easily cause water mist (affecting the reading) or cause creep to jam the character wheel, which is not conducive to ensuring the long-term and reliable use of the product.

[0005] Based on this, the applicant considered designing a wheel shaft liquid seal structure and a wet water meter counter that can better ensure long-term reliability. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a wheel shaft liquid seal structure and a wet water meter counter which can better ensure long-term reliability.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The liquid seal structure of the character wheel shaft comprises an annular sealing groove and an annular sealing ring filled in the annular sealing groove and sleeved on the character wheel shaft, wherein the annular sealing groove is formed on the outer side of the housing of the wet water meter counter in the axial direction of the character wheel shaft; and further comprises a sealing ring blocking structure for preventing the annular sealing ring from moving out of the annular sealing groove; the annular sealing ring has a radial outer side sealing structure and a radial inner side sealing structure; and is characterized in that:

[0009] The radially outer sealing structure is connected to the radially outer profile of the annular sealing groove to form a sealing surface; the radially inner sealing structure is matched with the outer surface of the wheel shaft to form a line contact seal or a surface contact seal;

[0010] The axial inner end face of the annular sealing ring is formed with an annular groove in the circumferential direction of the annular sealing ring; a first axial gap is formed between the portion of the axial inner end face of the annular sealing ring that is radially located inside the opening of the annular groove and the bottom of the annular sealing groove.

[0011] Compared with the prior art, the wheel shaft liquid seal structure in this scheme has the following advantages:

[0012] 1. It can effectively prevent the appearance of bubbles and better ensure long-term reliability

[0013] In this solution, after the above annular groove and the first axial gap are provided, the first axial gap can cooperate with the radial gap between the wheel shaft and the housing of the wet water meter counter to form a flow channel, and the flow channel can make the annular groove communicate with the inner cavity of the wet water meter counter. In this way, when the wet water meter counter is filled with special liquid, the above flow channel and the annular groove can also be filled.

[0014] At the same time, the liquid in the annular groove can exert pressure on the radial inner wall and outer wall of the annular ring, thereby increasing the sealing connection strength at the radial outer sealing structure and the radial inner sealing structure of the annular sealing ring, and improving the sealing reliability; thereby more effectively preventing the liquid in the inner cavity of the wet water meter counter from being extracted and forming bubbles during the vacuum filling process of the wet water meter, thereby effectively avoiding water mist caused by bubbles or creep jamming of the character wheel, and improving the reliability of the long-term use of the wet water meter counter.

[0015] 2. Simple structure and easy to implement

[0016] The technical solution mainly improves the structure of the annular sealing ring, which has low difficulty and cost, is easy to implement, and can achieve a more ideal implementation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structural diagram of the wet water meter counter adopting the utility model of the wheel shaft liquid seal structure

[0018] Figure 2 The cross-sectional view of a wet water meter counter adopting the utility model of the wheel shaft liquid seal structure

[0019] Figure 3 for Figure 2 Enlarged view of point I in the middle (first embodiment)

[0020] Figure 4 for Figure 2 Enlarged view of point I in the middle (second embodiment)

[0021] Figure 5 For existing wet water meter counters Figure 2 Enlarged view of point I

[0022] The markings in the figure are:

[0023] 1 reading window, 2 sealing ring baffle, 3 wheel axle;

[0024] 4 annular sealing ring: 41 annular groove, 42 first axial gap, 43 annular gap, 44 second axial gap;

[0025] 5-shaped wheel. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] The first embodiment, such as Figures 1 to 3 As shown:

[0028] The liquid seal structure of the character wheel shaft comprises an annular sealing groove and an annular sealing ring filled in the annular sealing groove and sleeved on the character wheel shaft, wherein the annular sealing groove is formed on the outer side of the housing of the wet water meter counter in the axial direction of the character wheel shaft; and further comprises a sealing ring blocking structure for preventing the annular sealing ring from moving out of the annular sealing groove; the annular sealing ring has a radial outer side sealing structure and a radial inner side sealing structure;

[0029] The radially outer sealing structure is connected to the radially outer profile of the annular sealing groove to form a sealing surface; the radially inner sealing structure is matched with the outer surface of the wheel shaft to form a line contact seal or a surface contact seal;

[0030] The axial inner end face of the annular sealing ring is formed with an annular groove in the circumferential direction of the annular sealing ring; a first axial gap is formed between the portion of the axial inner end face of the annular sealing ring that is radially located inside the opening of the annular groove and the bottom of the annular sealing groove.

[0031] In the technical solution, the end face of the annular sealing ring close to the inner cavity of the wet water meter counter in the axial direction is the axial inner end face.

[0032] During implementation, the sealing ring blocking structure may adopt a separate sealing ring baffle, or may utilize a boss formed on the end surface of the driving wheel mounted on the character wheel shaft and facing the annular sealing groove to form a sealing ring blocking structure (as shown in patent publication number CN102607661A). The above sealing ring blocking structures are all prior art and will not be described in detail here.

[0033] Wherein, the minimum axial spacing of the first axial gap is 5-12 threads.

[0034] The axial length of 5-12 threads (1 thread equals 0.01 mm) can smoothly ensure the formation of the above-mentioned flow channel while also ensuring that the radial inner side wall of the annular groove has a larger surface area, thereby obtaining a greater liquid pressure and a better line or surface contact sealing effect.

[0035] Wherein, the annular groove is located at the middle position of the axial inner end surface of the annular sealing ring in the radial width direction.

[0036] This ensures that the sidewall thickness of the radial inner and outer sides of the annular groove is the thickest, thereby better ensuring the reliability of the structure of the annular sealing ring itself.

[0037] The ratio of the radial width of the annular groove opening to the groove bottom is (1.5-2):1; and the ratio of the radial width of the annular groove opening to the total width of the axial inner end face of the annular sealing ring is 1:(2-3).

[0038] The above-mentioned size ratio relationship enables the special liquid filled into the wet water meter counter to enter the annular groove quickly and smoothly, and can also better ensure the elasticity and toughness of the radial inner and outer walls of the annular groove, thereby smoothly achieving a long-lasting and reliable seal.

[0039] Among them, the radial height of the radial outer side surface of the annular groove gradually decreases from the groove opening to the groove bottom in the axial direction; the radial height of the radial inner side surface of the annular groove gradually decreases and increases from the groove opening to the groove bottom in the axial direction.

[0040] With the above structure, the cross section of the annular groove is a trumpet-shaped structure with a larger outer end and a smaller inner end. This not only facilitates the rapid inflow of liquid, but also provides a larger pressure-bearing surface to fully contact the pressurized liquid and obtain the liquid pressure for achieving sealing.

[0041] The radial inner side surface of the annular sealing ring cooperates with the surface of the character wheel shaft at the inner end position along the axial direction to form a line contact seal or a surface contact seal, and an annular gap is formed between the radial inner side surface of the annular sealing ring and the surface of the character wheel shaft at the remaining position along the axial direction.

[0042] After adopting the above structural design, the line contact seal or the surface contact seal can be used for sealing, and the above annular gap can also be used to reduce the contact area between the annular seal ring and the character wheel shaft, thereby reducing friction and reducing the resistance to the rotation of the character wheel shaft, ensuring that the rotation of the character wheel shaft is smoother and more accurate.

[0043] Wherein, the radial spacing of the annular gap is 2-5 wires.

[0044] The annular gap with the above radial spacing will not interfere with the rotation of the character wheel shaft. At the same time, it also has a certain liquid storage capacity. The liquid stored in the annular gap can be used to form a lubricating support for the character wheel shaft.

[0045] Among them, a second axial gap is formed between the part of the axial inner end face of the annular sealing ring radially located outside the opening of the annular groove and the bottom of the annular sealing groove, and the axial spacing of the second axial gap is smaller than the axial spacing of the first axial gap.

[0046] The second embodiment, such as Figure 4 As shown:

[0047] The difference between this embodiment and the first embodiment is that:

[0048] The annular sealing ring is a mirror-symmetrical structure with respect to a central plane perpendicular to the axis.

[0049] During implementation, there is no fitting connection between the portion of the axial inner end surface of the annular sealing ring located radially outside the opening of the annular groove and the groove bottom and the end cover of the annular sealing groove.

[0050] During implementation, the radial inner side surface of the annular sealing ring cooperates with the surface of the character wheel shaft at the inner and outer ends along the axial direction to form a line contact seal or a surface contact seal, and an annular gap is formed between the radial inner side surface of the annular sealing ring and the surface of the character wheel shaft at the remaining positions along the axial direction.

[0051] A wet water meter counter comprises a wheel shaft liquid seal structure of any one of the two embodiments described above.

[0052] The force analysis of the sealing ring of the wet water meter counter during vacuum filling is as follows:

[0053] When the water meter manufacturer performs vacuum pumping and water filling, the entire wet water meter counter is in a vacuum (-0.1MPa) environment. Due to the barrier of the sealing ring, a pressure difference is formed inside and outside the wet water meter counter. The internal pressure of the wet water meter counter is the standard atmospheric pressure 0.1MPa, and the external pressure of the wet water meter counter is 0MPa. Therefore, the internal pressure of the O-ring of the old structure is Figure 5 As shown, there are forces in directions a, b, and c, which compress the sealing ring. When a gap appears at the sealing line 1 where the compressed sealing ring and the wheel shaft match, it will cause leakage in the wet water meter counter.

[0054] like Figures 1 to 3 The first embodiment of the utility model character wheel shaft liquid seal structure is shown, and its advantages are as follows:

[0055] 1. When vacuum filling, the inside of the sealing ring of the new structure is as follows Figure 3 As shown in the figure, there are forces in the directions of d, e, f, g, and h. Since the surface of the force in the direction of g is an inclined surface, the force in the direction of g perpendicular to the surface can be decomposed into components in the directions of X and Y axes. Since the component in the negative direction of the Y axis is perpendicular to the axis of the character wheel, this force will Figure 3 The contact force of the middle sealing line 3 is increased to prevent leakage in the wet water meter counter. When the vacuum is completed and the pressure difference between the inside and outside of the wet water meter counter disappears, the contact force of the sealing line 3 will automatically recover. The resultant force of the sealing ring along the X-axis direction is limited by the sealing ring baffle.

[0056] 2. Based on the principle described in advantage 1, the wrapping force between the sealing ring and the character wheel shaft can be further reduced, which will be beneficial to improving the metering performance of the product.

[0057] 3. Based on the principle described in advantage 1, the problem of less internal liquid in wet water meter counters during long-term transportation, storage, and temperature changes can also be optimized.

[0058] 4. After the sealing ring of the utility model is assembled normally, since the sealing ring is designed to be arc-shaped at this point (sealing line 3), the sealing ring is still in line contact with the sealing line 3 of the character wheel shaft.

[0059] like Figure 4 The second embodiment of the liquid seal structure of the character wheel shaft of the utility model is shown, and its advantages are as follows:

[0060] 1. The second embodiment of the wheel shaft liquid seal structure not only has all the advantages of the new structure 1, but also can ensure that after the wet water meter counter is assembled into a complete meter, the wet water meter counter is under a working pressure of 0.1 to 1 MPa as a whole (the pressure fluctuates repeatedly in this range). Based on the principle described in the first embodiment, the outer side of the wet water meter counter can block the tap water outside the wet water meter counter from entering the wet water meter counter and contaminating the pre-installed special liquid.

[0061] 2. The second embodiment of the wheel shaft liquid seal structure has one more sealing line than the first embodiment, and has better axial sealing performance.

[0062] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. A liquid seal structure for a wheel shaft, comprising an annular sealing groove and an annular sealing ring filled in the annular sealing groove and sleeved on the wheel shaft, wherein the annular sealing groove is formed on the outer side of a housing on a wet water meter counter in the axial direction of the wheel shaft; further comprising a sealing ring blocking structure for preventing the annular sealing ring from moving out of the annular sealing groove; the annular sealing ring has a radially outer sealing structure and a radially inner sealing structure; characterized in that: The radially outer sealing structure is connected to the radially outer profile of the annular sealing groove to form a sealing surface; the radially inner sealing structure is matched with the outer surface of the wheel shaft to form a line contact seal or a surface contact seal; The axial inner end face of the annular sealing ring is formed with an annular groove in the circumferential direction of the annular sealing ring; a first axial gap is formed between the portion of the axial inner end face of the annular sealing ring that is radially located inside the opening of the annular groove and the bottom of the annular sealing groove.

2. The character wheel shaft liquid seal structure according to claim 1, characterized in that: The minimum axial spacing of the first axial gap is 5-12 threads.

3. The character wheel shaft liquid seal structure according to claim 1, characterized in that: The annular groove is located at a middle position of the axial inner end surface of the annular sealing ring in a radial width direction.

4. The character wheel shaft liquid seal structure according to claim 1, characterized in that: The radial width ratio of the groove opening and the groove bottom of the annular groove is (1.5-2):1; and the radial width ratio of the groove opening of the annular groove to the total width of the axial inner end face of the annular sealing ring is 1:(2-3).

5. The character wheel shaft liquid seal structure according to claim 1, characterized in that: The radial height of the radial outer side surface of the annular groove gradually decreases from the groove opening to the groove bottom in the axial direction; the radial height of the radial inner side surface of the annular groove gradually decreases from the groove opening to the groove bottom in the axial direction.

6. The character wheel shaft liquid seal structure according to claim 1, characterized in that: The radial inner side surface of the annular sealing ring cooperates with the surface of the character wheel shaft at the inner end position along the axial direction to form a line contact seal or a surface contact seal, and an annular gap is formed between the radial inner side surface of the annular sealing ring and the surface of the character wheel shaft at the remaining position along the axial direction; Alternatively, the radial inner side surface of the annular sealing ring cooperates with the surface of the character wheel shaft at the inner and outer ends along the axial direction to form a line contact seal or a surface contact seal, and an annular gap is formed between the radial inner side surface of the annular sealing ring and the surface of the character wheel shaft at the remaining positions along the axial direction.

7. The character wheel shaft liquid seal structure according to claim 6, characterized in that: The radial spacing of the annular gap is 2-5 wires.

8. The character wheel shaft liquid seal structure according to claim 1, characterized in that: A second axial gap is formed between the portion of the axial inner end surface of the annular sealing ring radially located outside the opening of the annular groove and the bottom of the annular sealing groove, and the axial spacing of the second axial gap is smaller than the axial spacing of the first axial gap.

9. The wheel shaft liquid seal structure according to any one of claims 1 to 8, characterized in that: The annular sealing ring is a mirror-symmetrical structure with respect to a central plane perpendicular to the axis.

10. Wet water meter counter, characterized by: The invention comprises the wheel shaft liquid seal structure according to any one of claims 1 to 9.

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