Safe and reliable pressure guiding reversing module

Abstract

The utility model relates to a safe and reliable pressure drawing reversing module, which comprises a reversing module, a control unit and a differential pressure transmitter, the reversing module is provided with two pressure drawing inlets and a pressure drawing outlet, the two pressure drawing inlets are respectively connected with a first pressure tapping pipe and a second pressure tapping pipe, and the first pressure tapping pipe and the second pressure tapping pipe are both connected with branch lines; the first pressure tapping pipe is connected with one pressure leading outlet of the reversing module through a first forward direction reversing valve, a branch line of the first pressure tapping pipe is connected with the second pressure tapping pipe through a first reverse direction reversing valve, and the second pressure tapping pipe is connected with the other pressure leading outlet of the reversing module through a second forward direction reversing valve. The branch line is connected with the first pressure tapping pipe through the second reverse flow direction reversing valve, and a balance valve is arranged on a connecting pipeline between the first pressure tapping pipe and the second pressure tapping pipe and close to the pressure drawing outlet. The device is wide in applicability, safe, reliable, easy to replace and operate, low in operation difficulty of daily maintenance of operators on duty, and convenient for safety management of enterprises.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of instrument installation in chemical industry, especially relates to a safe and reliable pressure introduction reversing module. BACKGROUND

[0002] For the storage tank area, loading and unloading unit or process device area, there are medium conditions of bidirectional flow (part of time is forward flow, part of time is reverse flow), for the medium flow measurement of this kind of condition, ultrasonic wave, mass flowmeter etc. can be selected, but the cost of this type of instrument is higher, generally two differential pressure transmitters with throttling element can also be selected to measure.

[0003] When the medium flow direction is fixed, the high pressure side is upstream of the throttling element, and the low pressure side is downstream of the throttling element, when the medium flow direction is switched, the high pressure side and the low pressure side of the throttling element will change with the switching of the flow direction, two differential pressure measuring instruments are needed to measure the differential pressure direction of two different flow directions, but in order to protect the differential pressure measuring instrument for measuring reverse flow differential pressure, it is needed to isolate it from the throttling element, which not only increases the operation difficulty of the operator, but also increases the possibility of injury to the operator in the case of high temperature of the medium or toxic medium, at the same time, it also causes the idle waste of the differential pressure transmitter and increases the maintenance workload. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problems in the prior art, the utility model provides a safe and reliable pressure introduction reversing module, which realizes remote automatic switching of high and low pressure side pressure introduction reversing with less investment and engineering quantity, reduces the difficulty of manual operation, protects the safety of the operator, and can respond to the change of working condition in time.

[0005] The utility model discloses a safe and reliable pressure introduction reversing module, including reversing module, control unit, differential pressure transmitter, be equipped with two pressure introduction inlets and pressure introduction outlet on the reversing module, two pressure introduction inlets are connected with first pressure taking pipe and second pressure taking pipe respectively, first pressure taking pipe and second pressure taking pipe are all connected with branch line, first pressure taking pipe is connected with one pressure introduction outlet of reversing module through first positive flow direction reversing valve, and its branch line is connected with second pressure taking pipe through first reverse flow direction reversing valve, second pressure taking pipe is connected with another pressure introduction outlet of reversing module through second positive flow direction reversing valve, and its branch line is connected with first pressure taking pipe through second reverse flow direction reversing valve, the connecting pipeline on the place close to pressure introduction outlet between first pressure taking pipe and second pressure taking pipe is equipped with balance valve, the outlet end of first pressure taking pipe and second pressure taking pipe is connected with the positive pressure end and negative pressure end of differential pressure transmitter respectively, first positive flow direction reversing valve, first reverse flow direction reversing valve, second positive flow direction reversing valve, second reverse flow direction reversing valve and balance valve are connected with control unit through signal cable respectively.

[0006] Further, the control unit is provided with a forward flow direction measurement site button, a reverse flow direction measurement site button and a site button for shutting down.

[0007] In summary, the utility model discloses a different reversing valve switch combination can be realized regardless of the high pressure side and low pressure side direction of the pressure inlet changes, the high pressure side and low pressure side of the pressure outlet remain unchanged, and the module can be directly added in various petrochemical devices newly built or put into operation, that is, the original pressure inlet is used on the existing measured equipment or pipeline, and the original pressure pipeline can be installed, and can be used for measuring the medium such as gas, liquid and steam, and is widely applicable and safe and reliable, easy to replace and operate, and has certain economic benefits, can reduce the operation difficulty of daily maintenance of the on-duty personnel, saves human resources, brings certain economic benefits for enterprises, and can enhance the safety protection of personnel, reduces the labor intensity and possible high temperature, poisoning, corrosion and other injuries of the operating personnel, and is convenient for the safety management of enterprises.

[0008] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail in combination with the drawings as follows. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structural schematic view of a safe and reliable pressure reversing module of the utility model. DETAILED DESCRIPTION

[0010] The technical scheme of the utility model is further described below in combination with the drawings and preferred embodiments.

[0011] An embodiment of a safe and reliable pressure reversing module:

[0012] As Figure 1As shown, a safe and reliable pressure switching module includes a switching module, a differential pressure transmitter 10 and a control unit 8, the switching module is provided with two pressure inlet (A inlet and B inlet respectively) and pressure outlet (C outlet and D outlet respectively), two pressure inlet is connected to the first pressure pipe 1 and the second pressure pipe 9 respectively, the first pressure pipe 1 and the second pressure pipe 9 are connected with the throttling device at the end away from the pressure inlet, the first pressure pipe 1 and the second pressure pipe 9 are both connected with branch line; the first pressure pipe 1 is connected with one of the pressure outlet through the first positive flow switching valve 2-1, and the branch line thereof is connected with the second pressure pipe 9 through the first reverse flow switching valve 2-2, the second pressure pipe 9 is connected with the other pressure outlet through the second positive flow switching valve 3-1, and the branch line thereof is connected with the first pressure pipe 1 through the second reverse flow switching valve 3-2.

[0013] The connecting pipeline between the first pressure pipe 1 and the second pressure pipe 9 is provided with a balance valve 4, which is arranged on the pipeline connected with the pressure outlet after the switching valve (i.e. between the pressure outlet and the branch line output end of the pressure pipe), and when switching the pressure direction each time, the balance valve is opened to ensure that the pressures of the two pressure outlets are consistent, thereby avoiding damage to the measuring instrument due to too large pressure difference between the two outlets.

[0014] The outlet ends of the first pressure pipe 1 and the second pressure pipe 9 are connected with the positive pressure end and the negative pressure end of the differential pressure transmitter 10 respectively.

[0015] The first positive flow switching valve 2-1, the first reverse flow switching valve 2-2, the second positive flow switching valve 3-1, the second reverse flow switching valve 3-2 and the balance valve 4 are connected with the control unit 8 through signal cables respectively, the control unit 8 is provided with a positive flow measurement site button 5, a reverse flow measurement site button 6 and a shutdown site button 7, the switching valve and the balance valve can be automatically controlled according to the preset program, one-key switching is realized, and the troublesome operation and human error are avoided, thereby effectively protecting the safety of the measuring instrument and the operator.

[0016] In the embodiment, the switching valve can adopt a direct-acting electromagnetic valve, thereby realizing valve action.

[0017] In the embodiment, the pressure switching module is mainly used in the case that only one differential pressure measuring instrument is configured for the throttling element, and the differential pressures in the positive flow direction and the reverse flow direction of the throttling element are measured, and the switching process of the embodiment is as follows:

[0018] First, the positive flow pressure is taken (as shown in the attached Figure 1 The direction is shown, the medium flows from left to right, the A inlet is the high pressure side, and the B inlet is the low pressure side, and then the reverse flow pressure is taken (the medium flows from right to left, the B inlet is the high pressure side, and the A inlet is the low pressure side).

[0019] 1. In the initial state, all valves are in the closed state, when the positive flow direction measurement site button is pressed (or the positive flow direction measurement control signal is sent remotely), the control unit automatically opens the balance valve 4, after 2 seconds, the positive flow direction reversing valve 1 2-1 is automatically opened, after 3 seconds, the positive flow direction reversing valve 2 3-1 is opened, and the balance valve 4 is closed at the same time, realizing the pressure measurement of the high pressure side (A inlet) and the low pressure side (B inlet) of the throttling element in the positive flow direction, at this time, the pressure outlet C is the high pressure side, and the pressure outlet D is the low pressure side.

[0020] 2. When the medium flow direction through the throttling element changes from the positive flow direction to the reverse flow direction, the reverse flow direction measurement site button is pressed (or the reverse flow direction measurement control signal is sent remotely), the control unit automatically closes the positive flow direction reversing valve 1 2-1 and the positive flow direction reversing valve 2 3-1, after 2 seconds, the balance valve 4 is opened, after 2 seconds, the reverse flow direction reversing valve 2 3-2 is opened, after 2 seconds, the reverse flow direction reversing valve 1 2-2 is opened, and the balance valve 4 is closed at the same time, realizing the pressure measurement of the high pressure side (B inlet) and the low pressure side (A inlet) of the throttling element in the reverse flow direction, at this time, the pressure outlet C is the high pressure side, and the pressure outlet D is the low pressure side.

[0021] 4. When the medium flow direction through the throttling element changes from the reverse flow direction to the positive flow direction, the positive flow direction measurement site button is pressed (or the positive flow direction measurement control signal is sent remotely), the control unit automatically closes the reverse flow direction reversing valve 1 2-2 and the reverse flow direction reversing valve 2 3-2, after 2 seconds, the balance valve 4 is opened, after 2 seconds, the positive flow direction reversing valve 1 2-1 is opened, after 2 seconds, the positive flow direction reversing valve 2 3-1 is opened, and the balance valve 4 is closed at the same time, realizing the pressure measurement of the high pressure side (A inlet) and the low pressure side (B inlet) of the throttling element in the positive flow direction, at this time, the pressure outlet C is the high pressure side, and the pressure outlet D is the low pressure side.

[0022] 5. When it is necessary to cut off the connection between the throttling element and the differential pressure transmitter, the stop button 7 is pressed (or the stop control signal is sent remotely), then the positive flow direction reversing valve 1 2-1, the reverse flow direction reversing valve 1 2-2, the positive flow direction reversing valve 2 3-1, the reverse flow direction reversing valve 2 3-2 and the balance valve 4 are closed at the same time.

[0023] The above is only a preferred embodiment of the present application, any skilled person in the art, without departing from the technical scheme of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiment still belongs to the scope of the technical scheme of the present application.

Claims

1. A safe and reliable pressure switching module, characterized by: The application relates to a reverse module and a differential pressure transmitter (10), wherein two pressure introduction inlets and a pressure introduction outlet are arranged on the reverse module, the two pressure introduction inlets are connected with a first pressure taking pipe (1) and a second pressure taking pipe (9) respectively, and the first pressure taking pipe (1) and the second pressure taking pipe (9) are both connected with branch lines; the first pressure taking pipe (1) is connected with one of the pressure introduction outlets through a first forward flow direction reversing valve (2-1), the branch line of the first pressure taking pipe (1) is connected with the second pressure taking pipe (9) through a first reverse flow direction reversing valve (2-2), the second pressure taking pipe (9) is connected with the other pressure introduction outlet through a second forward flow direction reversing valve (3-1), the branch line of the second pressure taking pipe (9) is connected with the first pressure taking pipe (1) through a second reverse flow direction reversing valve (3-2), and a balance valve (4) is arranged on the connecting pipeline between the first pressure taking pipe (1) and the second pressure taking pipe (9); the outlet ends of the first pressure taking pipe (1) and the second pressure taking pipe (9) are connected with a positive pressure end and a negative pressure end of the differential pressure transmitter (10) respectively.

2. A safe and reliable pressure lead changeover module according to claim 1, characterized in that: The application further comprises a control unit (8), and the first forward flow direction reversing valve (2-1), the first reverse flow direction reversing valve (2-2), the second forward flow direction reversing valve (3-1), the second reverse flow direction reversing valve (3-2) and the balance valve (4) are connected with the control unit (8) through signal cables respectively.

3. A safe and reliable pressure lead changeover module according to claim 2, characterized in that: A forward flow direction measurement site button (5) is arranged on the control unit (8).

4. A safe and reliable pressure-switchover module according to claim 2, characterized in that A reverse flow direction measurement site button (6) is arranged on the control unit (8).

5. The safe and reliable pressure lead-through commutation module of claim 2, wherein: A stop site button (7) is arranged on the control unit (8).

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