Gear flow meter shell, gear flow meter and machining method of gear flow meter shell

Abstract

The invention provides a gear flow meter shell, a gear flow meter and a machining method of the gear flow meter shell. The gear flowmeter shell comprises a main shell body, a gear cavity is formed in the upper end face of the main shell body, a plurality of sunken steps are further arranged on the upper end face of the main shell body around the gear cavity, first through holes are formed in the steps, and at least two second through holes are formed in the bottom face of the gear cavity; the base is arranged below the main shell, a cavity is formed in the base, a medium inlet and a medium outlet which are communicated with the cavity are formed in the base, and a plurality of first fixing holes are further formed in the base; the first fastener is arranged in the first fixing hole and the first through hole so as to connect the base and the main shell; the upper cover is arranged above the main shell to seal the gear cavity, the upper cover is provided with receding grooves and second fixing holes, and the receding grooves correspond to the steps one to one; and the second fastener is arranged in the second fixing hole and the second through hole to connect the upper cover and the main shell, so that the pre-tightening force loss of the second fastener can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of flowmeters, and in particular to a gear flowmeter housing, a gear flowmeter and a processing method thereof. Background Art

[0002] Among the gear flow meters, the most common are oval gear flow meters and cylindrical gear flow meters. Figure 1 In the related art, when installing a gear flowmeter, the flowmeter cavity 100' and the cover plate 200' are often assembled into a pre-assembled body by means of a first bolt 300', and then the pre-assembled body is uniformly installed on the medium transmission adapter plate 500' using a second bolt 400'. After installation, the product looks neat and integrated, which is considered to be a very mature installation solution.

[0003] However, in actual use, especially in a vibration environment, the seal of the gear flowmeter with the above structure may easily fail. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art.

[0005] To this end, a first aspect of the present application is to provide a gear flow meter housing.

[0006] A second aspect of the present application is to provide a gear flow meter.

[0007] The third aspect of the present application is to provide a gear flowmeter processing method.

[0008] In view of this, according to the first aspect of the present application, a gear flowmeter housing is proposed, comprising: a main housing, the upper end surface of the main housing is provided with a gear cavity, the upper end surface of the main housing is also provided with a plurality of sunken steps around the gear cavity, a first through hole is provided on the step, and at least two second through holes are provided on the bottom surface of the gear cavity; a base is arranged below the main housing, a cavity is formed in the base, a medium inlet and a medium outlet are provided on the base, both the medium inlet and the medium outlet are connected to the cavity, a plurality of first fixing holes are also provided on the base, and the first fixing holes and the first through holes correspond one to one; a first fastener is arranged in the first fixing hole and the first through hole to connect the base and the main housing; an upper cover is arranged above the main housing to close the gear cavity, the upper cover is provided with a clearance groove and a second fixing hole, the clearance groove and the steps correspond one to one, and the second fixing hole and the second through hole correspond one to one; a second fastener is arranged in the second fixing hole and the second through hole to connect the upper cover and the main housing.

[0009] In the above technical solution, the main shell and the upper cover are first assembled into a preassembled body by the second fastener, and finally, the preassembled body and the base are connected by the first fastener. At this time, the clamping length of the first fastener is only the superimposed value of the thickness of the base and the step. In this way, the first fastener will not cause excessive impact on the second fastener when tightening, that is, the clamping effect of the first fastener is mainly concentrated between the base and the step, and will not cause additional tension or compression force to the second fastener, thereby avoiding the loss of preload force of the second fastener, which helps to improve the installation quality and sealing performance of the gear flowmeter; at the same time, compared with the gear flowmeter housing structure in the related art, the overall weight of the above gear flowmeter housing is reduced by 15%, and the lightweight effect is significant.

[0010] In some technical solutions, optionally, the cross section of the main housing is rectangular. During the manufacturing process, the rectangular structure has good structural stability and is easy to cut, drill and process, thereby helping to improve production efficiency and product quality.

[0011] In some technical solutions, there are at least four steps, and at least four steps are located at the four corners of the main housing. In this way, a stable quadrilateral structure can be formed, which is very stable in mechanics. It can not only ensure a tight connection between the base and the main housing, but also reduce deformation or looseness caused by uneven fastening.

[0012] In some technical solutions, optionally, a sealing ring is further included; the sealing ring is arranged between the main housing and the upper cover. The sealing ring can block the gap between the main housing and the upper cover to prevent leakage of the measured medium.

[0013] In some technical solutions, optionally, a sealing groove is provided on the upper end surface of the main housing; the sealing groove extends around the gear cavity; and the sealing ring is arranged in the sealing groove. In this way, the sealing groove provides accurate positioning and stable support for the sealing ring, thereby helping to form a more reliable sealing interface between the main housing and the upper cover.

[0014] In some technical solutions, optionally, the length of the first fastener is L, and the outer diameter of the first fastener is D, wherein 3D≤L≤5D. In this way, it can ensure that the first fastener has a sufficient length to ensure the fastening effect, and avoid the risk of excessive stress caused by an overly long fastener, and at the same time, it helps to reduce the weight of the entire structure.

[0015] According to the second aspect of the present application, the present application proposes a gear flowmeter, comprising a gear set and a gear flowmeter housing proposed by any of the above technical solutions; wherein the gear set is arranged in the gear cavity. Therefore, the gear flowmeter has all the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0016] In some technical solutions, optionally, the gear flowmeter further includes a meter; the meter is used to detect the medium flow; the meter is arranged on the upper surface of the upper cover.

[0017] According to the third aspect of the present application, the present application proposes a gear flowmeter processing method, which is used to process the gear flowmeter proposed in the second aspect of the present application. Therefore, all the beneficial effects of any of the above technical solutions are achieved, which will not be repeated here.

[0018] The gear flowmeter processing method specifically includes the following steps: Process the gear cavity of the main housing and the corresponding gear set; confirming the installation area of ​​the first fastener and the second fastener; Determine the model and torque of the first fastener and the second fastener according to the working pressure; Processing the step, the first through hole and the second through hole in the installation area according to the model and torque of the first fastener and the second fastener; Complete the processing of the upper cover and the base according to the outer contour of the main shell; For assembly, the gear set is placed in the gear cavity, the upper cover and the main housing are connected as a whole through the second fastener, and the main housing and the base are connected as a whole through the first fastener.

[0019] In some technical solutions, optionally, determining the model and torque of the first fastener and the second fastener according to the working pressure specifically includes: The model and torque of the second fastener are first determined according to the working pressure, and then the model and torque of the first fastener are determined according to the working pressure. In this way, unnecessary pre-tightening force loss of the internal second fastener can be further avoided.

[0020] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A schematic diagram of the structure of a gear flow meter in the related art is shown; Figure 2 A schematic structural diagram of a gear flowmeter in an embodiment of the present application is shown; Figure 3 A schematic structural diagram of a pre-assembled body in an embodiment of the present application is shown; Figure 4 A schematic structural diagram of a gear flowmeter housing in an embodiment of the present application is shown; Figure 5A schematic structural diagram of the main housing in an embodiment of the present application is shown; Figure 6 A schematic diagram of the structure of the upper cover in the embodiment of the present application is shown; Figure 7 A schematic structural diagram of a base in an embodiment of the present application is shown; Figure 8 A schematic structural diagram of a gear set of a gear flowmeter in an embodiment of the present application is shown; Fig. 9 A flowchart of a gear flow meter manufacturing method in an embodiment of the present application is shown.

[0022] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows: 100'-flow meter chamber; 200'-cover plate; 300'-first bolt; 400'-second bolt; 500'-medium transmission adapter plate; Figures 2 to 8 The corresponding relationship between the reference numerals and the component names is as follows: 10-gear flowmeter housing; 100-main housing; 101-gear chamber; 102-step; 103-first through hole; 104-second through hole; 105-sealing groove; 110-base; 111-chamber; 112-medium inlet; 113-medium outlet; 114-first fixing hole; 120-upper cover; 121-gap groove; 122-second fixing hole; 130-first fastener; 140-second fastener; 150-sealing ring; 20-gear flow meter; 210-gear set; 220-metering device. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0025] Reference Figure 1In the related art, the seal of the gear flowmeter is easily invalid during use, especially in a vibration environment. To solve the above problems, technicians in this field usually introduce a multi-stage sealing structure into the gear flowmeter, or use high-performance sealing materials, or use a locking device to lock the bolts, etc., to improve the sealing of the gear flowmeter. However, the above methods result in a more complex structure of the gear flowmeter, a higher manufacturing cost, and difficulty in installation.

[0026] However, the inventors of the present application discovered that the reason why the seal of the gear flowmeter of the above structure is prone to failure is that the pre-assembled body is uniformly installed on the medium transmission adapter plate 500' through the second bolt 400', and the second bolt 400' often needs to be clamped for a length equal to the superimposed value of the thickness of the cover plate 200', the flowmeter cavity 100', and the medium transmission adapter plate 500', resulting in a large aspect ratio of the second bolt 400', which is very unfavorable for the operation of the second bolt 400', especially in a harsh working environment with vibration.

[0027] For example, the height of the flow meter cavity 100' is tq0, the height of the cover plate 200' is tg0, and the initial length of the first bolt 300' is L0. After the cover plate 200' and the flow meter cavity 100' are assembled into a pre-assembled body through the first bolt 300', each component is in a balanced state. At this time, the total thickness of the pre-assembly is t1, and the length of the first bolt 300' is L1.

[0028] The pre-assembled body is fastened to the medium transmission adapter plate 500' by the second bolt 400'. At this time, under the pre-tightening force of the second bolt 400', the overall thickness of the pre-assembled body tends to be further compressed, and this tendency depends on the size of the tightening torque M. The overall thickness of the pre-assembled body after installation is t2, and the relationship between t2 and the tightening torque is:. When M takes M0, the corresponding pre-assembly thickness t2, at this time, the thickness of the pre-assembled body becomes smaller. Correspondingly, the first bolt 300' loses the pre-tightening force value, where K is the elastic coefficient of the first bolt 300'.

[0029] It can be seen that although the value of the tightening torque M of the second bolt 400' will remain within a certain range, ΔP will gradually increase as the value of the tightening torque M gradually increases. Therefore, in the related art, the pre-assembled body is uniformly installed on the structure of the medium transmission adapter plate 500' through the second bolt 400', and the burden of product sealing is entirely borne by the second bolt 400', which can easily lead to partial loss of the pre-tightening force of the first bolt 300', thereby causing sealing failure.

[0030] In view of this, the present application aims to provide a gear flowmeter housing, a gear flowmeter and a processing method thereof to reduce the risk of preload loss, thereby helping to improve the installation quality and sealing performance of the gear flowmeter.

[0031] Combine the following Figures 2 to 9 , the gear flowmeter housing, gear flowmeter and processing method thereof provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0032] Reference Figure 2 and Figure 4 In an embodiment of the present application, a gear flowmeter housing 10 is provided, and the gear flowmeter housing 10 includes: a main housing 100, a base 110, an upper cover 120, a first fastener 130 and a second fastener 140.

[0033] Reference Figure 5 Specifically, the upper end surface of the main housing 100 is provided with a gear cavity 101 for accommodating a gear set. The upper end surface of the main housing 100 is also provided with a plurality of sunken steps 102 around the gear cavity 101, and the steps 102 are provided with a first through hole 103. At least two second through holes 104 are provided on the bottom surface of the gear cavity 101.

[0034] Reference Figure 2 , Figure 4 and Figure 7 The base 110 is disposed below the main housing 100, a cavity 111 is formed in the base 110, a medium inlet 112 and a medium outlet 113 are provided on the base 110, and both the medium inlet 112 and the medium outlet 113 are in communication with the cavity 111 to form a complete medium channel, thereby ensuring that the medium can enter and leave the gear flowmeter housing 10. A plurality of first fixing holes 114 are provided on the base 110, and the first fixing holes 114 correspond to the first through holes 103 one by one.

[0035] Reference Figure 3 The first fastener 130 is disposed in the first fixing hole 114 of the first through hole 103 so that the base 110 and the main housing 100 are connected as one.

[0036] Reference Figure 4 and Figure 6 The upper cover 120 is disposed above the main housing 100 to close the gear chamber 101. The upper cover 120 is provided with a clearance groove 121 and a second fixing hole 122; the clearance groove 121 corresponds to the step 102 one by one, thereby providing sufficient installation space for the first fastener 130; the second fixing hole 122 corresponds to the second through hole 104 one by one.

[0037] Reference Figure 2 and Figure 4 The second fastener 140 is disposed in the second through hole 104 and the second fixing hole 122 so that the upper cover 120 and the main shell 100 are connected as one.

[0038] In the above embodiment, the main shell 100 and the upper cover 120 are first assembled into a preassembled body by the second fastener 140, and finally, the preassembled body and the base 110 are connected by the first fastener 130. At this time, the clamping length of the first fastener 130 is only the superimposed value of the thickness of the base 110 and the step 102. In this way, the first fastener 130 will not cause too much impact on the second fastener 140 when tightening, that is, the clamping effect of the first fastener 130 is mainly concentrated between the base 110 and the step 102, and will not cause additional tension or compression force to the second fastener 140, thereby avoiding the loss of the preload force of the second fastener 140, which helps to improve the installation quality and sealing performance of the gear flowmeter; at the same time, compared with the gear flowmeter housing structure in the related art, the overall weight of the above gear flowmeter housing is reduced by 15%, and the lightweight effect is significant.

[0039] In the above embodiment, the first fastener 130 and the second fastener 140 are bolts or screws. However, it is understandable that other fastening structures, such as screws and nuts, etc., can also be used, and this embodiment is not limited thereto.

[0040] In some embodiments, the cross section of the main housing 100 is rectangular. During the manufacturing process, the rectangular structure has good structural stability and is easy to cut, drill and process, thereby helping to improve production efficiency and product quality.

[0041] Reference Figure 5 In the above embodiment, there are four steps 102, and the four steps 102 are located at the four corners of the main housing 100. In this way, a stable quadrilateral structure can be formed, which is very stable in mechanics. It can not only ensure the tight connection between the base 110 and the main housing 100, but also reduce deformation or looseness caused by uneven fastening.

[0042] In practical applications, the upper cover 120 matches the contour of the main housing 100. This design allows the upper cover 120 and the main housing 100 to fit tightly together and helps reduce the weight of the entire structure.

[0043] In some embodiments, the gear flowmeter housing further includes a sealing ring 150, which is disposed between the main housing 100 and the upper cover 120. The sealing ring 150 can block the gap between the main housing 100 and the upper cover 120 to prevent leakage of the measured medium.

[0044] Reference Figure 5In the above embodiment, a sealing groove 105 is provided on the upper end surface of the main housing 100; the sealing groove 105 extends around the gear chamber 101, and the sealing ring 150 is disposed in the sealing groove 105. In this way, the sealing groove 105 provides accurate positioning and stable support for the sealing ring 150, thereby facilitating the formation of a more reliable sealing interface between the main housing 100 and the upper cover 120.

[0045] In some embodiments, the length of the first fastener 130 is L, and the outer diameter of the first fastener 130 is D, wherein 3D≤L≤5D. In this way, the first fastener 130 can be ensured to have a sufficient length to ensure the fastening effect, and the risk of excessive stress caused by an overly long fastener can be avoided, and at the same time, it helps to reduce the weight of the entire structure.

[0046] Reference Figure 2 and Figure 8 According to the second aspect of the present application, in some embodiments, the present application further provides a gear flowmeter 20, which includes a gear set 210 and a gear flowmeter housing 10 provided in any of the above embodiments. The gear set 210 is disposed in the gear cavity 101. Therefore, the gear flowmeter 20 has all the beneficial effects of any of the above embodiments, which will not be described in detail.

[0047] In some embodiments, the gear flow meter 20 further includes a meter 220 for detecting the flow rate of the medium. The meter 220 detects and calculates the flow rate of the medium by receiving signals from sensors inside the flow meter (such as gear rotation sensors). These sensors are usually connected to the gear set 210 inside the gear flow meter. When the medium passes through, the gear set 210 rotates, thereby triggering the sensor to generate a signal.

[0048] The meter 220 is disposed on the upper surface of the upper cover 120 so that the user can read the flow information. It is understood that in practical applications, the meter 220 also has a data communication function, so that the flow data can be remotely transmitted to a computer or other data processing system.

[0049] According to the third aspect of the present application, in some embodiments, the present application further provides a gear flowmeter processing method, which is used to process the gear flowmeter provided in the second aspect of the present application. Thus, all the beneficial effects of any of the above embodiments are achieved, which will not be repeated here.

[0050] Reference Fig. 9 Specifically, the gear flowmeter processing method includes the following steps: S100, processing the gear cavity of the main housing and the corresponding gear set; S200, confirming the installation space of the first fastener and the second fastener; S300, confirming the model and torque of the first fastener and the second fastener according to the working pressure; S400, processing the step, the first through hole, and the second through hole according to the model and torque of the first fastener and the second fastener; S500, completing the processing of the upper cover and the base according to the outer contour of the main shell; S600, assembling, placing the gear set in the gear cavity, connecting the upper cover and the main housing into one piece through the second fastener, and connecting the main housing and the base into one piece through the first fastener.

[0051] In the above embodiment, the gear cavity of the main housing and the gear set inside the gear are firstly designed according to the input conditions (many constraints such as the flow rate measurement requirement range, the working pressure range and the peripheral size requirements).

[0052] After completing the preliminary shaping of the gear set and the gear cavity, identify the available installation space of the main housing. This installation space is mainly reserved for the installation space of the first fastener and the second fastener. It should be noted that each installation space needs to be considered in a balanced manner. If the product has related requirements such as explosion-proof, the minimum wall thickness after the structure is opened also needs to be considered.

[0053] After the installation space is confirmed, the model and torque of the first fastener and the second fastener are confirmed according to the working pressure.

[0054] According to the model and torque of the first fastener and the second fastener, the step area and height are confirmed, and the first through hole and the second through hole are processed. It is particularly important to note that the mounting platform area should not be too large, and the installation space and loading and unloading space of the bolts should be guaranteed to avoid excessive intrusion, resulting in the cavity being too thin and insufficient mechanical properties.

[0055] Finally, the processing design of the upper cover and the base is completed; the outer contour of the upper cover is consistent with the main shell. According to the above design, the overall weight of the gear flowmeter is reduced by 15%, and the lightweight effect is significant. The most important thing is that it avoids the wrong installation structure and installation form, and effectively avoids the unnecessary preload loss of the internal first fastener.

[0056] In some embodiments, since the second fastener needs to resist the medium pressure from the inside, and the first fastener only installs the product to a certain position, the confirmation priority of the second fastener is higher than that of the first fastener, and the design order cannot be changed arbitrarily, that is, the model and torque of the second fastener are determined according to the working pressure first, and then the model and torque of the first fastener are determined according to the working pressure. In this way, unnecessary pre-tightening force loss of the internal second fastener can be further avoided.

[0057] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0058] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, specification and drawings of the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A gear flowmeter housing, characterized in that: include: A main housing, wherein the upper end surface of the main housing is provided with a gear cavity, the upper end surface of the main housing is further provided with a plurality of sunken steps around the gear cavity, the steps are provided with a first through hole, and the bottom surface of the gear cavity is provided with at least two second through holes; A base is arranged below the main housing, a cavity is formed in the base, a medium inlet and a medium outlet are arranged on the base, both the medium inlet and the medium outlet are connected to the cavity, and a plurality of first fixing holes are also arranged on the base, and the first fixing holes correspond to the first through holes one by one; a first fastener, disposed in the first fixing hole and the first through hole to connect the base and the main housing; An upper cover is arranged above the main housing to close the gear chamber, the upper cover is provided with a clearance groove and a second fixing hole, the clearance groove corresponds to the step one by one, and the second fixing hole corresponds to the second through hole one by one; A second fastener is disposed in the second fixing hole and the second through hole to connect the upper cover and the main shell.

2. The gear flowmeter housing according to claim 1, characterized in that: The cross section of the main housing is rectangular.

3. The gear flowmeter housing according to claim 2, characterized in that: There are at least four steps, and at least four steps are located at four corners of the main shell.

4. The gear flowmeter housing according to claim 1, characterized in that: It also includes a sealing ring; the sealing ring is arranged between the main shell and the upper cover.

5. The gear flow meter housing according to claim 4, characterized in that: The upper end surface of the main housing is provided with a sealing groove; the sealing groove extends around the gear cavity; and the sealing ring is arranged in the sealing groove.

6. The gear flow meter housing according to any one of claims 1 to 5, characterized in that: The length of the first fastener is L, and the outer diameter of the first fastener is D; wherein 3D≤L≤5D.

7. A gear flow meter, characterized in that: The invention comprises a gear set and a gear flow meter housing as claimed in any one of claims 1 to 6; wherein the gear set is arranged in the gear cavity.

8. The gear flow meter according to claim 7, characterized in that: It also includes a meter; the meter is used to detect the medium flow; the meter is arranged on the upper surface of the upper cover.

9. A gear flowmeter processing method, characterized in that: Used for processing the gear flowmeter as claimed in claim 7 or 8, the gear flowmeter processing method specifically comprises the following steps: Process the gear cavity of the main housing and the corresponding gear set; confirming the installation area of ​​the first fastener and the second fastener; Determine the model and torque of the first fastener and the second fastener according to the working pressure; Processing the step, the first through hole and the second through hole in the installation area according to the model and torque of the first fastener and the second fastener; Complete the processing of the upper cover and the base according to the outer contour of the main shell; For assembly, the gear set is placed in the gear cavity, the upper cover and the main housing are connected as a whole through the second fastener, and the main housing and the base are connected as a whole through the first fastener.

10. The gear flowmeter processing method according to claim 9, characterized in that: Determining the model and torque of the first fastener and the second fastener according to the working pressure specifically includes: First, the model and torque of the first fastener are determined according to the working pressure, and then the model and torque of the second fastener are determined according to the working pressure.

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