Differential pressure type flowmeter

Abstract

According to the differential pressure type flow meter, direct reading of flow is achieved through the arrangement of the multi-parameter transmitter, an original calculating device is replaced, the site space is saved, and the wiring workload is reduced. The differential pressure flowmeter comprises a throttling device, a multi-parameter transmitter, a temperature detection device and a valve group device, wherein the valve group device is communicated between the multi-parameter transmitter and the throttling device; the throttling device is connected to a to-be-measured pipeline and forms a positive pressure side and a negative pressure side, the multi-parameter transmitter is provided with a positive pressure measuring chamber and a negative pressure measuring chamber, the positive pressure measuring chamber is communicated with the positive pressure side, the negative pressure measuring chamber is communicated with the negative pressure side, and the temperature detection device is used for detecting the temperature of fluid in the to-be-measured pipeline; the multi-parameter transmitter is also integrated with a calculation module, and the temperature detection device is in signal connection with the calculation module. The multi-parameter transmitter can detect the pressure difference and the pressure value, and achieves the calculation function at the same time, so that a traditional external calculation device is omitted, the on-site layout space is saved, and the workload of wiring is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flow detection, in particular to a differential pressure flow meter. Background Art

[0002] Whether in the petroleum, chemical or metallurgical industries, differential pressure flow meters are widely used. With the development of flow meter instrument technology, people's requirements for differential pressure flow meters are getting higher and higher. Conventional differential pressure flow meters calculate the flow rate by testing the pressure difference before and after the medium passes through the flow meter. Since the calculation process is cumbersome, it needs to be completed by additional calculation devices such as flow integrators. The flow meter transmits the measurement results to the flow integrator for calculation. The additional calculation device also needs to occupy the site. In addition, since the calculation device is a certain distance from the flow meter, it also leads to a large workload of on-site wiring. Utility Model Content

[0003] The utility model aims to provide a differential pressure flow meter, which realizes direct flow reading by arranging a multi-parameter transmitter, replaces the original calculation device, saves on-site space, and reduces the wiring workload.

[0004] To achieve the above-mentioned purpose, the utility model provides a differential pressure flowmeter, including a throttling device, a multi-parameter transmitter, a temperature detection device and a valve group device, wherein the valve group device is connected between the multi-parameter transmitter and the throttling device; the throttling device is connected to the pipeline to be measured and forms a positive pressure side and a negative pressure side, the multi-parameter transmitter has a positive pressure measuring chamber and a negative pressure measuring chamber, the positive pressure measuring chamber is connected to the positive pressure side, and the negative pressure measuring chamber is connected to the negative pressure side, and the temperature detection device is used to detect the temperature of the fluid in the pipeline to be measured; the multi-parameter transmitter is also integrated with a calculation module, and the temperature detection device is signal-connected to the calculation module.

[0005] By setting up a multi-parameter transmitter to detect the pressure difference and pressure value and realize the calculation function at the same time, the traditional external calculation device is eliminated, the on-site layout space is saved, and the wiring workload is reduced.

[0006] Optionally, the valve group device includes a positive pressure channel for communicating with the positive pressure measuring chamber of the multi-parameter transmitter and a negative pressure channel for communicating with the negative pressure measuring chamber of the multi-parameter transmitter; and also includes a pressure-guiding device, the pressure-guiding device includes a positive pressure pipe and a negative pressure pipe, the diameter of the positive pressure pipe is smaller than the diameter of the negative pressure pipe, and the negative pressure pipe is sleeved on the outside of the positive pressure pipe; the inner cavity of the positive pressure pipe defines a first flow channel, and a second flow channel is defined between the positive pressure pipe and the negative pressure pipe, and the first flow channel is spaced apart from the second flow channel; the first flow channel connects the positive pressure side of the throttling device with the positive pressure flow channel, and the second flow channel is used to connect the negative pressure side of the throttling device with the negative pressure flow channel.

[0007] Optionally, an axial dimension of the positive pressure-guiding tube is greater than an axial dimension of the negative pressure-guiding tube.

[0008] Optionally, the positive pressure pipe, the negative pressure pipe and the throttling device are welded.

[0009] Optionally, the throttling device comprises an upstream flange, a downstream flange and a connecting ring connected to each other, an inner wall of the connecting ring is provided with an annular boss, and the annular boss defines a throttling hole;

[0010] The connecting ring is provided with a first positive pressure hole communicating with the positive pressure side, and a first negative pressure hole communicating with the negative pressure side. The first positive pressure hole is connected to the first flow channel, and the first negative pressure hole is connected to the second flow channel.

[0011] Optionally, a recessed groove is provided on the outer wall of the connecting ring, and the first positive pressure hole passes through the bottom of the recessed groove; the end face of the positive pressure pipe abuts against the bottom of the groove and is welded to the recessed groove.

[0012] Optionally, the throttling device comprises an upstream flange, a downstream flange and a connecting ring, the inner wall of the connecting ring is provided with an annular boss, and the annular boss defines a throttling hole;

[0013] The connecting ring is provided with a mounting countersunk hole, a tubular joint is welded to the mounting countersunk hole, a mounting channel is provided to the joint, and the mounting channel is communicated with the negative pressure side of the throttling device.

[0014] Optionally, the temperature detection device includes a detection head and a connecting portion connected to each other, the detection head is inserted into the throttling device through the installation channel, and the connecting portion is connected to the joint to block the installation channel.

[0015] Optionally, the joint is threadedly connected to the connecting portion.

[0016] Optionally, the multi-parameter transmitter is threadedly connected to the valve group device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0018] Figure 1 It is an exploded view of the differential pressure flow meter in the embodiment of the utility model;

[0019] Figure 2 yes Figure 1 An exploded view of the pressure-inducing device;

[0020] Figure 3 yes Figure 2 In the figure, an enlarged view of the pressure-leading part;

[0021] Figure 4 This is an exploded view of the pressure-inducing device;

[0022] Figure 5 It is an exploded diagram of the temperature detection device;

[0023] Figure 6 It is an end view of the valve group device;

[0024] Figure 7 This is a view of the other end of the valve group device.

[0025] Figure 1-Figure 7 middle:

[0026] 100, throttling device; 101, upstream flange; 102, upstream metal winding gasket; 103, throttling piece; 103a, connecting ring; 103b, annular boss; 104, downstream metal winding gasket; 105, fastener; 106, downstream flange; 107, first positive pressure hole; 108, first negative pressure hole; 109, mounting countersunk hole;

[0027] 200, temperature detection device; 201, detection head; 202, joint; 203, connection part;

[0028] 300, pressure-inducing device; 301, negative pressure-inducing pipe; 302, positive pressure-inducing pipe;

[0029] 400, valve group device; 401, second positive pressure hole; 402, second negative pressure hole; 403, third positive pressure hole; 404, third negative pressure hole;

[0030] 500. Multi-parameter transmitter. DETAILED DESCRIPTION

[0031] The utility model provides a differential pressure flow meter, which realizes direct flow reading by arranging a multi-parameter transmitter, replaces the original calculation device, saves on-site space, and reduces wiring workload.

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0034] Please refer to Figure 1 and Figure 2 , Figure 1 It is an exploded view of the differential pressure flow meter in the embodiment of the utility model; Figure 2 yes Figure 1 Exploded view of the pressure-inducing device.

[0035] As shown in the figure, the differential pressure flowmeter of the utility model includes a throttling device 100, a multi-parameter transmitter 500, a temperature detection device 200 and a valve group device 400. The throttling device 100 is connected to the pipeline to be measured to form a positive pressure side and a negative pressure side. Specifically, the interception device 100 locally contracts the flow beam flowing through it, thereby increasing the flow rate, and then a pressure drop is generated before and after the throttling device 103, which forms a positive pressure side and a negative pressure side. The positive pressure side is located upstream of the throttling device 100, that is, the front side of the throttling device 100, and the negative pressure side is located downstream of the throttling device 100, that is, the rear side of the throttling device 100; the multi-parameter transmitter 500 has a positive pressure measuring chamber and a negative pressure measuring chamber, and the positive pressure measuring chamber and the throttling device The positive pressure side of the device 100 is connected, and the negative pressure measuring chamber is connected to the negative pressure side of the throttling device 100, so as to obtain the pressure difference value upstream and downstream of the throttling device 100. In addition, the multi-parameter transmitter 500 can also obtain the pressure value on the positive pressure side of the throttling device 100. At the same time, a calculation module is also integrated in the multi-parameter transmitter 500. The calculation module reads the pressure value and the pressure difference value on the positive pressure side and calculates the flow rate. In other words, the multi-parameter transmitter 500 is used to detect the pressure value and the pressure difference, and to calculate the flow rate of the pipeline to be measured; in the present application, by setting the multi-parameter transmitter 500, the pressure difference and the pressure value are detected, and the calculation function is realized at the same time, thereby eliminating the traditional external calculation device, saving the on-site layout space, and reducing the wiring workload.

[0036] In the above-mentioned implementation mode, if Figure 6 and Figure 7 As shown, Figure 6 It is an end view of the valve group device; Figure 7It is a view of the other end of the valve group device; the valve group device 400 is connected between the multi-parameter transmitter 500 and the throttling device 100, and the valve group device 400 is specifically an integrated three-valve group, which further simplifies the wiring and improves the integration; wherein, the integrated three-valve group specifically includes a valve body, two stop valves and a balancing valve, the left side is a high-pressure valve, and the flow channel formed by the high-pressure valve is a positive-pressure flow channel, the right side is a low-pressure valve, and the flow channel formed by the low-pressure valve is a negative-pressure flow channel, the positive-pressure flow channel is connected to the positive-pressure measuring chamber of the multi-parameter transmitter 500; the negative-pressure flow channel is used to connect to the negative-pressure measuring chamber of the multi-parameter transmitter 500; that is, That is, the high-pressure valve is connected between the positive-pressure measuring chamber and the high-pressure side, thereby realizing the connection or disconnection between the high-pressure side and the positive-pressure measuring chamber; the low-pressure valve is connected between the negative-pressure measuring chamber and the low-pressure side, thereby realizing the connection or disconnection between the low-pressure side and the negative-pressure measuring chamber; in the present application, in order to further reduce the occupied space of the flow meter and simplify the wiring, a multi-parameter transmitter 500 is arranged on the upper side of the valve group device 400, and a throttling device 100 is arranged on the lower side, that is, the throttling device 100 and the multi-parameter transmitter 500 are respectively arranged on the upper and lower sides of the valve group device 400, wherein the upper and lower directions of the valve group device 400, that is, Figure 1 The up and down directions correspond to the radial direction of the flange of the throttling device 100. At the same time, in order to further improve the integration, the throttling device 100 and the valve group device 400 are abutted and threadedly connected.

[0037] In addition, due to the difference in the medium to be measured, the temperature has a greater impact on the medium to be measured. In the above embodiment, a temperature detection device 200 is also provided to detect the temperature of the fluid in the pipeline to be measured, and the temperature detection device 200 is signal-connected to the multi-parameter transmitter 500. The temperature detection device 200 can send the collected temperature to the multi-parameter transmitter 500, so that the multi-parameter transmitter 500 can calculate a more accurate flow rate.

[0038] The specific structure and connection method of the differential pressure flow meter of the present application are described below with two specific embodiments.

[0039] Embodiment 1

[0040] In this embodiment, please combine Figure 1 , Figure 2 Figure 3 and Figure 4 , Figure 3 yes Figure 2 In the figure, an enlarged view of the pressure-leading part; Figure 4It is an exploded view of the pressure-inducing device; the throttling device 100 includes an upstream flange 101, a downstream flange 106 and a connecting ring 103a, the upstream flange 101 and the downstream flange 106 are used to communicate with the pipeline, and the upstream flange 101 and the downstream flange 106 are connected by fasteners 105. The connecting ring 103a is located between the upstream flange 101 and the downstream flange 106. At the same time, the upstream flange 101 and the connecting ring 103a are sealed by the upstream metal winding gasket 102, and the downstream flange 106 and the connecting ring 103a are also sealed by the downstream metal winding gasket 104. Specifically, the middle part of the connecting ring 103a has an annular boss 103b, and the annular boss 103b defines a throttling hole. In other words, the axial cross-section of the connecting ring 103a is approximately H-shaped, the inner ring side of the annular boss 103b is a throttling hole, the upward extending section of the outer ring side cooperates with the upstream flange 101, and the downward extending section of the outer ring side cooperates with the downstream flange 106. In this embodiment, in order to improve the integration of the differential pressure flowmeter in this application, the connection method of the valve group device 400 and the throttling device 100 is further improved.

[0041] The differential pressure flow meter also includes a pressure guide device 300, which includes a positive pressure guide tube 302 and a negative pressure guide tube 301. The diameter of the positive pressure guide tube 302 is smaller than that of the negative pressure guide tube 301, and the negative pressure guide tube 301 is sleeved on the outside of the positive pressure guide tube 302; thereby simplifying the structural arrangement of the guide tubes, and only one pressure guide tube can be seen on the outside of the flow meter, and the pressure guide tube is made of metal, which has greater structural strength and can also play a certain supporting role; wherein, the inner cavity of the positive pressure guide tube 302 defines a first flow channel, and the positive pressure guide tube A second flow channel is defined between 302 and the negative pressure pipe 301, and the first flow channel is spaced from the second flow channel; the first flow channel connects the positive pressure side of the throttling device 100 with the positive pressure flow channel, and the second flow channel is used to connect the negative pressure side of the throttling device 100 with the negative pressure flow channel; one end of the positive pressure pipe 302 and the negative pressure pipe 301 are welded to the throttling device 100, and the other end is welded to the valve body, and a seal is formed by welding, thereby achieving fluid sealing for the two flow channels. The welding method can be selected by technicians in this field and is not specifically limited here.

[0042] Specifically, in order to weld with the pressure-conducting pipe, the present application further improves the specific structure of the throttling device 100. Since the two pressure-conducting pipes in the present application are socketed, it is crucial to avoid interference between the two pressure-conducting pipes during welding.

[0043] The connecting ring 103a is provided with a first positive pressure hole 107 connected to the positive pressure side, and a first negative pressure hole 108 connected to the negative pressure side. The first positive pressure hole 107 is used to communicate with the first flow channel, and the first negative pressure hole 108 is used to communicate with the second flow channel. When projected in the axial direction of the pressure-inducing pipe, the first positive pressure hole 107 is located within the projection range of the first flow channel, and the first negative pressure hole 108 is located within the projection range of the second flow channel. Here, the specific shapes and quantities of the first positive pressure hole 107 and the first negative pressure hole 108 are not limited. Positive pressure-inducing pipe 3 02 has an axial dimension greater than that of the negative pressure tube 301, and both ends of the positive pressure tube 302 extend out from the negative pressure tube 301; in order to match the positive pressure tube 302, a groove is provided on the outer wall of the connecting ring 103a, and the first positive pressure hole 107 passes through the bottom of the groove; the end face of the positive pressure tube 302 abuts against the bottom of the groove and is welded to the groove; similarly, a second positive pressure hole 401 and a second negative pressure hole 402 are provided on the lower wall of the valve body, and a groove is also provided on the lower wall of the valve body, and the second positive pressure hole 401 is located at the bottom of the groove.

[0044] The specific welding process is:

[0045] First, when welding the pressure-inducing device 300, one end of the positive pressure-inducing pipe 302 is firstly abutted against the groove bottom of the valve assembly device 400 and the groove bottom of the connecting ring 103a, and the second positive pressure hole 401 or the first positive pressure hole 107 on the corresponding side is covered, and the end of the positive pressure-inducing pipe 302 is welded to the corresponding side sink groove;

[0046] Then, after the negative pressure pipe 301 is sleeved onto the positive pressure pipe 302, since the axial dimension of the negative pressure pipe 301 is smaller than that of the positive pressure pipe 302, the unwelded end of the positive pressure pipe 302 can extend out of the negative pressure pipe 301. At this time, the unwelded end of the positive pressure pipe 302 is abutted against the other of the groove bottom of the valve assembly device 400 and the groove bottom of the connecting ring 103a, and covers the first positive pressure hole 107 or the second positive pressure hole 401 on the corresponding side, and the end of the positive pressure pipe 302 is welded to the corresponding sink groove;

[0047] At this time, weld the end of the negative pressure tube 301 to the lower wall of the valve body, and ensure that the negative pressure tube 301 covers the second negative pressure hole 402; weld the other end of the negative pressure tube 301 to the outer wall of the connecting ring 103a, and ensure that the negative pressure tube 301 covers the first negative pressure hole 108.

[0048] In this embodiment, a corresponding third positive pressure hole 403 and a third negative pressure hole 404 are opened on the upper wall of the valve body, and the third positive pressure hole 403 and the third negative pressure hole 404 are connected to the corresponding positive pressure measuring chamber and negative pressure measuring chamber of the multi-parameter transmitter 500.

[0049] Embodiment 2

[0050] In this embodiment, please combine Figure 1 , Figure 2 Figure 3 and Figure 5 , Figure 5 It is an exploded diagram of the temperature detection device; the parts that are the same as those in the first embodiment are not described in detail. In this embodiment, in order to avoid damage to the pipeline by the temperature detection device 200, the temperature detection device 200 is integrated into the connecting ring 103a; and the specific integration method is described.

[0051] Specifically, the connecting ring 103a is provided with an installation countersunk hole 109, which means that a countersunk groove is provided on the outer wall of the connecting ring 103a, and a through hole is provided at the bottom of the groove; a tubular joint 202 is welded to the installation countersunk hole 109, and the joint 202 is a hollow tube. The inner cavity of the joint 202, that is, the tube cavity, is an installation channel, and the temperature detection device 200 is inserted into the throttling device 100 through the installation channel; the installation channel is connected to the positive pressure side or the negative pressure side of the throttling device 100, that is, the installation countersunk hole 109 is located on the positive pressure side or the negative pressure side. When the installation countersunk hole 109 is located on the negative pressure side, it can avoid the temperature detection device 200 from interfering with the flow beam.

[0052] The temperature detection device 200 includes a detection head 201 and a connecting part 203. The connecting part 203 is arranged at the end of the detection head 201, and the detection head 201 is used to detect the temperature of the flow stream; the detection head 201 extends into the throttling device 100 through the installation channel, and the connecting part 203 is used to be threadedly connected with the other end of the joint 202, so as to form a fluid seal in the installation channel. In addition to the threaded connection method, it can also be a snap-on connection, a plug-in connection, etc., and here it is based on the ability to achieve fluid sealing.

[0053] The differential pressure flowmeter provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A differential pressure flow meter, characterized in that: It includes a throttling device, a multi-parameter transmitter, a temperature detection device and a valve group device, wherein the valve group device is connected between the multi-parameter transmitter and the throttling device; the throttling device is connected to the pipeline to be measured and forms a positive pressure side and a negative pressure side, the multi-parameter transmitter has a positive pressure measuring chamber and a negative pressure measuring chamber, the positive pressure measuring chamber is connected to the positive pressure side, and the negative pressure measuring chamber is connected to the negative pressure side, and the temperature detection device is used to detect the temperature of the fluid in the pipeline to be measured; the multi-parameter transmitter is also integrated with a calculation module, and the temperature detection device is connected to the calculation module signal.

2. The differential pressure flow meter according to claim 1, characterized in that: The valve group device includes a positive pressure channel for communicating with the positive pressure measuring chamber and a negative pressure channel for communicating with the negative pressure measuring chamber; it also includes a pressure-guiding device, the pressure-guiding device includes a positive pressure tube and a negative pressure tube, the diameter of the positive pressure tube is smaller than the diameter of the negative pressure tube, and the negative pressure tube is sleeved on the outside of the positive pressure tube; the inner cavity of the positive pressure tube defines a first flow channel, and a second flow channel is defined between the positive pressure tube and the negative pressure tube, and the first flow channel is spaced apart from the second flow channel; the first flow channel connects the positive pressure side of the throttling device with the positive pressure channel, and the second flow channel connects the negative pressure side of the throttling device with the negative pressure channel.

3. The differential pressure flow meter according to claim 2, characterized in that: The axial dimension of the positive pressure-guiding tube is greater than the axial dimension of the negative pressure-guiding tube.

4. The differential pressure flow meter according to claim 2, characterized in that: The pressure-inducing device is welded to the throttling device.

5. The differential pressure flow meter according to claim 2, characterized in that: The throttling device comprises an upstream flange, a downstream flange and a connecting ring connected to each other, the inner wall of the connecting ring is provided with an annular boss, and the annular boss defines a throttling hole; The connecting ring is provided with a first positive pressure hole communicating with the positive pressure side, and a first negative pressure hole communicating with the negative pressure side. The first positive pressure hole is connected to the first flow channel, and the first negative pressure hole is connected to the second flow channel.

6. The differential pressure flow meter according to claim 5, characterized in that: A recessed groove is formed on the outer wall of the connecting ring, and the first positive pressure hole passes through the bottom of the recessed groove; the end surface of the positive pressure-guiding pipe abuts against the bottom of the groove and is welded to the recessed groove.

7. The differential pressure flow meter according to claim 1, characterized in that: The throttling device comprises an upstream flange, a downstream flange and a connecting ring, wherein an inner wall of the connecting ring is provided with an annular boss, and the annular boss defines a throttling hole; The connecting ring is provided with a mounting countersunk hole, a tubular joint is welded to the mounting countersunk hole, a mounting channel is provided to the joint, and the mounting channel is communicated with the negative pressure side of the throttling device.

8. The differential pressure flow meter according to claim 7, characterized in that: The temperature detection device comprises a detection head and a connection part which are connected to each other. The detection head is inserted into the throttling device through the installation channel. The connection part is connected to the joint to block the installation channel.

9. The differential pressure flow meter according to claim 8, characterized in that: The joint is threadedly connected to the connecting portion.

10. The differential pressure flow meter according to any one of claims 1 to 9, characterized in that: The multi-parameter transmitter is threadedly connected to the valve group device.

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