pressure transmitter

Abstract

The application discloses a pressure transmitter, which comprises a main valve block, an adapter plate fixedly connected to the end face of the main valve block, a first chamber and a second chamber arranged left and right in the main valve block, a first inlet and outlet channel and a second inlet and outlet channel arranged left and right on the adapter plate, a pressure difference sensor arranged between the first chamber and the second chamber, a sealing joint arranged in the second chamber, and a circuit board arranged outside the second chamber and electrically connected to the sealing joint.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic device technology, and specifically relates to a pressure transmitter. Background Technology

[0002] A pressure transmitter is an industrial sensor that converts pressure parameters into standard electrical signals, widely used in automation control in fields such as water conservancy, petrochemicals, and power. A patent with publication number CN209286819U discloses a redundant filtration device for underwater SCM (Sustainable Compressor), including a valve block, a shuttle valve connected to and communicating with the valve block, and two filters. A pressure transmitter is provided for each filter to detect the pressure or state of the hydraulic oil after filtration. The oil enters the corresponding filter through two inlets of the valve block, is transported to the shuttle valve via the filter and valve block, and finally flows out through one outlet of the valve block. The existing device has multiple chambers between the valve block and the filters, each requiring a sensor; only through the cooperation of two sensors can the pressure difference between the chambers be effectively measured. Since the control panel is installed on the outside of the valve block, the wiring between the sensor and the control panel is cumbersome, requiring protection of the wiring. Furthermore, waterproof sealing is required between the sensor and the control panel, making the manufacturing process complex. Therefore, a pressure transmitter needs to be designed to overcome these difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a pressure transmitter. This invention can directly measure the pressure difference by setting a separate differential pressure sensor between the first chamber and the second chamber, and connects to the circuit board through a built-in sealed joint; the circuit is easy to install, has a high degree of integration, and the operation is more reliable.

[0004] The objective of this invention is achieved through the following technical solution: a pressure transmitter includes a main valve block, with a converter plate fixedly connected to the end face of the main valve block; the main valve block has a first chamber and a second chamber arranged adjacent to each other on the left and right, and the converter plate has a first inlet / outlet channel and a second inlet / outlet channel arranged adjacent to each other on the left and right; the first chamber is connected to the first inlet / outlet channel, and the second chamber is connected to the second inlet / outlet channel; a differential pressure sensor is provided between the first chamber and the second chamber, and a sealing joint is provided in the second chamber, with the differential pressure sensor electrically connected to the sealing joint; a circuit board is provided on the outside of the second chamber, and the sealing joint is also electrically connected to the circuit board.

[0005] Preferably, the first chamber has a straight channel at the end facing the second chamber, and a differential pressure sensor is sealed and installed on the inner wall of the second chamber; a connector pressure block is fixedly installed at the open end of the second chamber, and a clamping sleeve is installed on the inner side of the connector pressure block; the end of the clamping sleeve away from the connector pressure block is fitted with the differential pressure sensor, and the clamping sleeve has a first through hole communicating with the second chamber; a circuit board is installed on the outer side of the connector pressure block, and a cover plate is fixedly installed on the side of the main valve block; the cover plate is arranged adjacent to the circuit board, and an insertion hole is provided between the cover plate and the main valve block.

[0006] Preferably, the straight hole channel is horizontally disposed between the first chamber and the second chamber. The inner wall of the second chamber is provided with an annular groove, and a first sealing ring is disposed in the annular groove. The outer contour of the first sealing ring is adapted to the outer contour of the annular groove. One end of the differential pressure sensor is disposed adjacent to the first sealing ring, and the other end of the differential pressure sensor is disposed in contact with the clamping sleeve.

[0007] Preferably, one end of the straight hole channel is connected to the first chamber, and the other end of the straight hole channel is connected to the body of the differential pressure sensor; the outer wall of the differential pressure sensor is provided with an annular protrusion, and the opening end of the clamping sleeve is fitted with the annular protrusion; the clamping sleeve is in the shape of a hollow cylinder, and the middle of the clamping sleeve is provided with an inner concave portion, the outer diameter of the inner concave portion being smaller than the outer diameter of the edge of the clamping sleeve; the inner concave portion is provided with a pair of first through holes, and the two first through holes are connected to each other.

[0008] By incorporating a first sealing ring and an annular groove, better sealing is achieved between the differential pressure sensor and the first chamber, preventing hydraulic oil from directly entering and exiting the first and second chambers through the straight-hole channel. The clamping sleeve, in conjunction with the connector block and sealing connector, ensures the differential pressure sensor fits snugly against the inner wall of the second chamber, further enhancing sealing. The annular protrusion further tightens the fit between the differential pressure sensor and the clamping sleeve, resulting in a better compression seal. One end of the clamping sleeve compresses the differential pressure sensor, while the other end compresses the sealing connector, thus clamping the sealing connector between the clamping sleeve and the connector block, limiting its axial movement. The recessed portion creates a larger gap between the outer wall of the clamping sleeve and the flow channel of the second chamber, facilitating the entry and exit of hydraulic oil. Due to the small diameter of the first through-hole and the hollow design of the clamping sleeve, the flow rate of hydraulic oil entering the clamping sleeve is reduced, preventing hydraulic oil from impacting the wires inside the clamping sleeve and ensuring a more stable electrical connection between the differential pressure sensor and the sealing connector. Meanwhile, the first through-hole allows hydraulic oil to smoothly enter the clamping sleeve, thereby compressing the differential pressure sensor. A straight-hole channel with a small inner diameter is provided at the end of the first chamber facing the second chamber, allowing for a faster flow rate of hydraulic oil into the channel, thus better compressing the differential pressure sensor. The differential pressure sensor can then sensitively detect the pressure difference between the first and second chambers. The circuit board is located on the outside of the second chamber to prevent direct contact between the hydraulic oil and the circuit board. A cover plate protects the circuit board, and through-holes facilitate the installation of wires on the circuit board.

[0009] Preferably, a sealing joint is provided between the clamping sleeve and the joint pressing block; one end of the sealing joint is installed against the outer wall of the clamping sleeve, and the other end of the sealing joint is installed against the end face of the joint pressing block.

[0010] Preferably, a fastener is provided between the connector pressure block and the main valve block to fix the two together; the connector pressure block is provided with an annular step, and the main valve block is provided with a first groove; the outer contour of the annular step is adapted to the outer contour of the first groove, and the annular step is set in the first groove when the connector pressure block is installed on the main valve block.

[0011] Preferably, the sealing joint is disposed in the second chamber of the main valve block; a second sealing ring is provided between the sealing joint and the main valve block, and a second groove for installing the second sealing ring is provided in the main valve block; an annular retaining ring is also provided in the second groove, and the annular retaining ring is disposed adjacent to the second sealing ring; the second sealing ring and the annular retaining ring are both sleeved and installed on the outer layer of the sealing joint.

[0012] Preferably, the sealing joint includes a sealing base, on which a plurality of insulating glass blanks are embedded; a metal lead is inserted into the insulating glass blank, one end of the metal lead is disposed in the second chamber and electrically connected to a differential pressure sensor; the other end of the metal lead is disposed outside the second chamber and electrically connected to a circuit board.

[0013] By setting the first groove and the annular step, the connector pressure block is limited, making the connection between the connector pressure block and the main valve block more secure. The second groove facilitates the installation of the second sealing ring and the annular retaining ring. The annular retaining ring limits the second sealing ring, preventing displacement and improving the sealing effect. The second sealing ring, in conjunction with the sealing connector, isolates the second chamber from the circuit board, preventing hydraulic oil in the second chamber from spreading onto the circuit board. The metal leads are electrically connected to the differential pressure sensor via wires (standard components not shown in the accompanying drawings). The second chamber is filled with hydraulic oil; since hydraulic oil is not a conductor and the sealing base has an insulating glass blank, the metal leads in the second chamber will not interfere with each other. One end of the metal lead is electrically connected to the differential pressure sensor, and the other end is electrically connected to the circuit board. This allows the circuit board and the differential pressure sensor to be electrically connected, enabling automatic calculation of the pressure difference between the first and second chambers. Because the differential pressure sensor and the sealing base are both built into the main valve block, the structure is more compact and space-saving. Meanwhile, by avoiding external wiring, the circuit board can easily control the working status of the differential pressure sensor, making the testing process more stable and reliable.

[0014] Preferably, a third groove is provided between the main valve block and the adapter plate, and a third sealing ring for sealing the main valve block and the adapter plate is provided in the third groove; the third groove is respectively connected to the first chamber and the first inlet / outlet channel; a fourth groove is also provided between the main valve block and the adapter plate, and a fourth sealing ring for sealing the main valve block and the adapter plate is provided in the fourth groove; the fourth groove is respectively connected to the second chamber and the second inlet / outlet channel; a throttling chamber is also provided between the main valve block and the adapter plate, and a fifth sealing ring for sealing the main valve block and the adapter plate is provided in the throttling chamber, and the throttling chamber is located between the first inlet / outlet channel and the second inlet / outlet channel.

[0015] Preferably, a pair of throttling orifices are provided between the throttling chamber and the adapter plate; a first external hydraulic drive is installed between one of the throttling orifices and the first inlet / outlet channel, and a second external hydraulic drive is installed between the other throttling orifice and the second inlet / outlet channel; a sixth sealing ring is provided between the first external hydraulic drive and the adapter plate, and a seventh sealing ring is provided between the second external hydraulic drive and the adapter plate; a first limiting mounting groove for installing the sixth sealing ring is provided on the adapter plate, and the sixth sealing ring surrounds the first inlet / outlet channel and one of the throttling orifices; a second limiting mounting groove for installing the seventh sealing ring is also provided on the adapter plate, and the seventh sealing ring surrounds the second inlet / outlet channel and the other throttling orifice.

[0016] By setting up an adapter plate, the first and second external hydraulic drives can be easily transferred and installed on the main valve block. The third sealing ring improves the sealing performance of the third groove, ensuring reliable hydraulic oil flow only between the first chamber and the first inlet / outlet channel. Similarly, the fourth sealing ring improves the sealing performance of the fourth groove, ensuring reliable hydraulic oil flow only between the second chamber and the second inlet / outlet channel. The fifth sealing ring further improves the sealing performance of the throttling chamber. The throttling chamber and orifice facilitate pressure adjustment within the first and second chambers, thus stabilizing the pressure value within the main valve block and ensuring stable and reliable operation of the pressure transmitter. Both the first and second external hydraulic drives are standard hydraulic actuators, such as hydraulic cylinders or hydraulic grippers; neither is shown in the accompanying drawings. The first external hydraulic drive component is disposed between the first inlet / outlet channel and one of the throttling orifices via a sixth sealing ring, and the second external hydraulic drive component is disposed between the second inlet / outlet channel and the other throttling orifice via a seventh sealing ring. When the main valve block is in the return oil phase, excess hydraulic oil in the first and second external hydraulic drives component can slowly flow back into the throttling chamber, thereby automatically adjusting the pressure values ​​in the first and second chambers.

[0017] Compared with the prior art, the present invention has the following advantages: 1. The present invention can calculate the pressure difference between the first chamber and the second chamber using a single built-in differential pressure sensor, reducing the number of sensors in the main valve block, thus making the main valve block structure more compact and greatly reducing manufacturing costs; 2. The differential pressure sensor in the main valve block is limited by a clamping sleeve, so that the differential pressure sensor can abut against the inner wall of the second chamber, thus providing better sealing between the first chamber and the second chamber; 3. The differential pressure sensor can be electrically connected to the circuit board through the built-in sealing joint; the sealing joint has good sealing performance and insulation effect, which can prevent hydraulic oil in the second chamber from spreading to the circuit board; 4. The differential pressure sensor, circuit board and sealing joint are all integrated and installed inside the main valve block, which is compact and makes wiring more convenient, avoiding external wire tangling, greatly improving assembly efficiency and reliability; 5. By setting a throttling chamber between the main valve block and the adapter plate, the pressure value in the main valve block can be effectively adjusted, so that the pressure transmitter operates more stably and is safer and more reliable. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the invention from another angle; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 for Figure 3 A magnified view of a portion of position A in the middle; Figure 5 This is an exploded view of the present invention; Figure 6 for Figure 5 A magnified view of a portion of position B in the middle; Figure 7 A three-dimensional view of the compression sleeve; Figure 8 A three-dimensional view of the sealing joint; The diagram shows the following markings: 1. Main valve block; 2. Adapter plate; 3. First chamber; 4. Second chamber; 5. First inlet / outlet channel; 6. Second inlet / outlet channel; 7. Differential pressure sensor; 71. Annular protrusion; 8. Sealing joint; 81. Sealing base; 82. Insulating glass blank; 83. Metal lead wire; 9. Circuit board; 10. Straight hole channel; 11. Joint clamping block; 111. Annular step; 12. Clamping sleeve; 121. Recessed part; 13. First through hole; 14. Cover plate; 15. 16. Interlocking hole; 17. Annular groove; 18. First sealing ring; 19. Fastener; 20. First groove; 21. Second sealing ring; 22. Annular retaining ring; 23. Third groove; 24. Third sealing ring; 25. Fourth groove; 26. Fourth sealing ring; 27. Throttling chamber; 28. Fifth sealing ring; 29. ​​Throttling orifice; 30. Sixth sealing ring; 31. Seventh sealing ring; 32. First limiting mounting groove; 33. Second limiting mounting groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments illustrated in the accompanying drawings: like Figures 1 to 8 As shown, this embodiment discloses a pressure transmitter, including a main valve block 1, with a converter plate 2 fixedly connected to the end face of the main valve block 1; the main valve block 1 has a first chamber 3 and a second chamber 4 arranged adjacent to each other on the left and right, and the converter plate 2 has a first inlet / outlet channel 5 and a second inlet / outlet channel 6 arranged adjacent to each other on the left and right; the first chamber 3 is connected to the first inlet / outlet channel 5, and the second chamber 4 is connected to the second inlet / outlet channel 6; a differential pressure sensor 7 is provided between the first chamber 3 and the second chamber 4, and a sealing joint 8 is provided in the second chamber 4, with the differential pressure sensor 7 electrically connected to the sealing joint 8; a circuit board 9 is provided on the outside of the second chamber 4, and the sealing joint 8 is also electrically connected to the circuit board 9.

[0020] The first chamber 3 has a straight hole channel 10 at the end facing the second chamber 4, and a differential pressure sensor 7 is sealed and installed on the inner wall of the second chamber 4; a connector pressure block 11 is fixedly installed at the open end of the second chamber 4, and a clamping sleeve 12 is installed on the inner side of the connector pressure block 11; the end of the clamping sleeve 12 away from the connector pressure block 11 is fitted with the differential pressure sensor 7, and the clamping sleeve 12 has a first through hole 13 that communicates with the second chamber 4; a circuit board 9 is installed on the outer side of the connector pressure block 11, and a cover plate 14 is also fixedly installed on the side of the main valve block 1; the cover plate 14 is arranged adjacent to the circuit board 9, and an insertion hole 15 is provided between the cover plate 14 and the main valve block 1. The straight-hole channel 10 is horizontally disposed between the first chamber 3 and the second chamber 4. An annular groove 16 is provided on the inner wall of the second chamber 4, and a first sealing ring 17 is disposed within the annular groove 16. The outer contour of the first sealing ring 17 is adapted to the outer contour of the annular groove 16. One end of the differential pressure sensor 7 is adjacent to the first sealing ring 17, and the other end of the differential pressure sensor 7 is fitted against the clamping sleeve 12. One end of the straight-hole channel 10 is connected to the first chamber 3, and the other end is connected to the body of the differential pressure sensor 7. An annular protrusion 71 is provided on the outer wall of the differential pressure sensor 7, and the open end of the clamping sleeve 12 is fitted against the annular protrusion 71. The clamping sleeve 12 is a hollow cylinder, and a concave portion 121 is provided in the middle of the clamping sleeve 12. The outer diameter of the concave portion 121 is smaller than the outer diameter of the edge of the clamping sleeve 12. A pair of first through holes 13 are provided on the concave portion 121, and the two first through holes 13 are interconnected.

[0021] A sealing joint 8 is provided between the clamping sleeve 12 and the connector pressure block 11; one end of the sealing joint 8 abuts against the outer wall of the clamping sleeve 12, and the other end of the sealing joint 8 abuts against the end face of the connector pressure block 11. A fastener 18 for fixing the connector pressure block 11 and the main valve block 1 is provided between them; the connector pressure block 11 has an annular step 111, and the main valve block 1 has a first groove 19; the outer contour of the annular step 111 matches the outer contour of the first groove 19, and when the connector pressure block 11 is installed on the main valve block 1, the annular step 111 is positioned within the first groove 19. The sealing joint 8 is located within the second chamber 4 of the main valve block 1; a second sealing ring 20 is provided between the sealing joint 8 and the main valve block 1, and a second groove 21 for installing the second sealing ring 20 is provided within the main valve block 1; an annular retaining ring 22 is also provided within the second groove 21, and the annular retaining ring 22 is arranged adjacent to the second sealing ring 20; both the second sealing ring 20 and the annular retaining ring 22 are fitted onto the outer layer of the sealing joint 8. The sealing joint 8 includes a sealing base 81, on which a plurality of insulating glass blanks 82 are embedded; a metal lead wire 83 is inserted into the insulating glass blank 82, one end of the metal lead wire 83 is disposed in the second chamber 4 and electrically connected to the differential pressure sensor 7; the other end of the metal lead wire 83 is disposed outside the second chamber 4 and electrically connected to the circuit board 9.

[0022] A third groove 23 is provided between the main valve block 1 and the adapter plate 2. The third groove 23 is provided with a third sealing ring 24 for sealing the main valve block 1 and the adapter plate 2. The third groove 23 is connected to the first chamber 3 and the first inlet / outlet channel 5 respectively. A fourth groove 25 is also provided between the main valve block 1 and the adapter plate 2. The fourth groove 25 is provided with a fourth sealing ring 26 for sealing the main valve block 1 and the adapter plate 2 respectively. The fourth groove 25 is connected to the second chamber 4 and the second inlet / outlet channel 6 respectively. A throttling chamber 27 is also provided between the main valve block 1 and the adapter plate 2. The throttling chamber 27 is provided with a fifth sealing ring 28 for sealing the main valve block 1 and the adapter plate 2. The throttling chamber 27 is located between the first inlet / outlet channel 5 and the second inlet / outlet channel 6. A pair of throttling orifices 29 are provided between the throttling chamber 27 and the adapter plate 2; a first external hydraulic drive is installed between one of the throttling orifices 29 and the first inlet / outlet channel 5, and a second external hydraulic drive is installed between the other throttling orifice 29 and the second inlet / outlet channel 6; a sixth sealing ring 30 is provided between the first external hydraulic drive and the adapter plate 2, and a seventh sealing ring 31 is provided between the second external hydraulic drive and the adapter plate 2; the adapter plate 2 is provided with a first limiting mounting groove 32 for installing the sixth sealing ring 30, and the sixth sealing ring 30 surrounds the first inlet / outlet channel 5 and one of the throttling orifices 29; the adapter plate 2 is also provided with a second limiting mounting groove 33 for installing the seventh sealing ring 31, and the seventh sealing ring 31 surrounds the second inlet / outlet channel 6 and the other throttling orifice 29.

[0023] The specific operation process of this embodiment is as follows: By setting the first sealing ring 17 and the annular groove 16, the differential pressure sensor 7 and the first chamber 3 are better sealed, preventing hydraulic oil from directly entering and exiting the first chamber 3 and the second chamber 4 through the straight hole channel 10. By setting the clamping sleeve 12, which cooperates with the connector pressure block 11 and the sealing connector 8, the differential pressure sensor 7 is tightly attached to the inner wall of the second chamber 4, resulting in better sealing. By setting the annular protrusion 71, the differential pressure sensor 7 and the clamping sleeve 12 fit more tightly, resulting in better compression sealing. One end of the clamping sleeve 12 compresses the differential pressure sensor 7, and the other end of the clamping sleeve 12 compresses the sealing connector 8, so that the sealing connector 8 is clamped between the clamping sleeve 12 and the connector pressure block 11, and the axial movement of the sealing connector 8 is limited. By setting the concave portion 121, there is a larger gap between the outer wall of the clamping sleeve 12 and the flow channel of the second chamber 4, facilitating the entry and exit of hydraulic oil from the second chamber 4. Because the diameter of the first through hole 13 is small and the clamping sleeve 12 is hollow, the flow rate of hydraulic oil entering the clamping sleeve 12 is small, preventing the hydraulic oil from impacting the wires inside the clamping sleeve 12. This makes the electrical connection between the differential pressure sensor 7 and the sealing joint 8 more stable. Simultaneously, the first through hole 13 allows hydraulic oil to smoothly enter the clamping sleeve 12, thereby compressing the differential pressure sensor 7. A straight channel 10 is provided at the end of the first chamber 3 facing the second chamber 4. The inner diameter of the straight channel 10 is small, allowing the hydraulic oil to flow into the straight channel 10 at a faster rate, thus better compressing the differential pressure sensor 7. The differential pressure sensor 7 can then sensitively detect the pressure difference between the first chamber 3 and the second chamber 4. The circuit board 9 is located on the outside of the second chamber 4, preventing direct contact between the hydraulic oil and the circuit board 9. A cover plate 14 protects the circuit board 9. Through holes 15 facilitate the installation of wires on the circuit board 9.

[0024] By setting the first groove 19 and the annular step 111, the connector pressure block 11 is limited, and the connection between the connector pressure block 11 and the main valve block 1 is more secure. By setting the second groove 21, it is convenient to install the second sealing ring 20 and the annular retaining ring 22. The annular retaining ring 22 limits the second sealing ring 20, preventing the second sealing ring 20 from shifting and improving the sealing effect. The second sealing ring 20, together with the sealing connector 8, can separate the second chamber 4 from the circuit board 9, preventing the hydraulic oil in the second chamber 4 from spreading to the circuit board 9. The metal lead 83 is electrically connected to the differential pressure sensor 7 through a wire. The wire is an existing standard part and is not shown in the second chamber 4 in the attached drawings of the specification. The second chamber 4 is filled with hydraulic oil. Since the hydraulic oil is not a conductor and the sealing base 81 is provided with an insulating glass blank 82, each of the metal leads 83 in the second chamber 4 will not interfere with each other. One end of the metal lead 83 is electrically connected to the differential pressure sensor 7, and the other end is electrically connected to the circuit board 9. This allows the circuit board 9 and the differential pressure sensor 7 to be electrically connected, enabling the automatic calculation of the pressure difference between the first chamber 3 and the second chamber 4 through the cooperation of the circuit board 9 and the differential pressure sensor 7. Since both the differential pressure sensor 7 and the sealing base 81 are built into the main valve block 1, the structure is more compact and space-saving. Furthermore, by avoiding external wiring, the circuit board 9 can easily control the operating state of the differential pressure sensor 7, making the testing process more stable and reliable.

[0025] By setting the adapter plate 2, it is convenient to transfer and install the first and second external hydraulic drives onto the main valve block 1. By setting the third sealing ring 24, the third groove 23 has better sealing performance, so that the hydraulic oil can only reliably flow between the first chamber 3 and the first inlet / outlet channel 5. By setting the fourth sealing ring 26, the fourth groove 25 has better sealing performance, so that the hydraulic oil can only reliably flow between the second chamber 4 and the second inlet / outlet channel 6. By setting the fifth sealing ring 28, the throttling chamber 27 has better sealing performance. By setting the throttling chamber 27 and the throttling orifice 29, it is convenient to adjust the pressure in the first chamber 3 and the second chamber 4; thus, the pressure value in the main valve block 1 can be stabilized, so that the pressure transmitter can work stably and reliably. Here, the first and second external hydraulic drives are both existing standard hydraulic actuating components, such as hydraulic cylinders or hydraulic mechanical grippers, etc.; neither the first nor the second external hydraulic drives are shown in the accompanying drawings of the specification. The first external hydraulic drive component is disposed between the first inlet / outlet channel 5 and one of the throttling orifices 29 via a sixth sealing ring 30, and the second external hydraulic drive component is disposed between the second inlet / outlet channel 6 and the other throttling orifice 29 via a seventh sealing ring 31. When the main valve block 1 is in the return oil phase, excess hydraulic oil in the first and second external hydraulic drives can slowly flow back into the throttling chamber 27, thereby automatically adjusting the pressure values ​​in the first chamber 3 and the second chamber 4.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A pressure transmitter, comprising a main valve block (1), characterized in that, A transition plate (2) is fixedly connected to the end face of the main valve block (1); the main valve block (1) is provided with a first chamber (3) and a second chamber (4) arranged adjacent to each other on the left and right, and the transition plate (2) is provided with a first inlet / outlet channel (5) and a second inlet / outlet channel (6) arranged adjacent to each other on the left and right; the first chamber (3) is connected to the first inlet / outlet channel (5), and the second chamber (4) is connected to the second inlet / outlet channel (6); a differential pressure sensor (7) is provided between the first chamber (3) and the second chamber (4), and a sealing joint (8) is provided in the second chamber (4), and the differential pressure sensor (7) is electrically connected to the sealing joint (8); a circuit board (9) is provided on the outside of the second chamber (4), and the sealing joint (8) is also electrically connected to the circuit board (9); the first chamber (3) A straight hole channel (10) is provided at the end facing the second chamber (4), and a differential pressure sensor (7) is sealed and installed on the inner wall of the second chamber (4); a connector pressure block (11) is fixedly installed at the open end of the second chamber (4), and a clamping sleeve (12) is installed on the inner side of the connector pressure block (11); the end of the clamping sleeve (12) away from the connector pressure block (11) is fitted with the differential pressure sensor (7), and a first through hole (13) communicating with the second chamber (4) is provided on the clamping sleeve (12); a circuit board (9) is installed on the outer side of the connector pressure block (11), and a cover plate (14) is also fixedly installed on the side of the main valve block (1); the cover plate (14) is arranged adjacent to the circuit board (9), and an insertion hole (15) is provided between the cover plate (14) and the main valve block (1).

2. The pressure transmitter according to claim 1, characterized in that, The straight hole channel (10) is horizontally arranged between the first chamber (3) and the second chamber (4). The inner wall of the second chamber (4) is provided with an annular groove (16). The annular groove (16) is provided with a first sealing ring (17). The outer contour of the first sealing ring (17) is adapted to the outer contour of the annular groove (16). One end of the differential pressure sensor (7) is arranged adjacent to the first sealing ring (17), and the other end of the differential pressure sensor (7) is fitted to the clamping sleeve (12).

3. The pressure transmitter according to claim 2, characterized in that, One end of the straight hole channel (10) is connected to the first chamber (3), and the other end of the straight hole channel (10) is connected to the body of the differential pressure sensor (7); the outer wall of the differential pressure sensor (7) is provided with an annular protrusion (71), and the opening end of the clamping sleeve (12) is fitted with the annular protrusion (71); the clamping sleeve (12) is in the shape of a hollow cylinder, and the middle of the clamping sleeve (12) is provided with an inner concave part (121), the outer diameter of the inner concave part (121) is smaller than the outer diameter of the edge of the clamping sleeve (12); the inner concave part (121) is provided with a pair of first through holes (13), and the two first through holes (13) are connected to each other.

4. The pressure transmitter according to claim 1, characterized in that, A sealing joint (8) is provided between the compression sleeve (12) and the connector pressure block (11); one end of the sealing joint (8) is installed against the outer wall of the compression sleeve (12), and the other end of the sealing joint (8) is installed against the end face of the connector pressure block (11).

5. The pressure transmitter according to claim 4, characterized in that, A fastener (18) for fixing the connector pressure block (11) and the main valve block (1) is provided; the connector pressure block (11) is provided with an annular step (111), and the main valve block (1) is provided with a first groove (19); the outer contour of the annular step (111) is adapted to the outer contour of the first groove (19), and when the connector pressure block (11) is installed on the main valve block (1), the annular step (111) is set in the first groove (19).

6. The pressure transmitter according to claim 4, characterized in that, The sealing joint (8) is located in the second chamber (4) of the main valve block (1); a second sealing ring (20) is provided between the sealing joint (8) and the main valve block (1), and a second groove (21) for installing the second sealing ring (20) is provided in the main valve block (1); an annular retaining ring (22) is also provided in the second groove (21), and the annular retaining ring (22) is arranged adjacent to the second sealing ring (20); the second sealing ring (20) and the annular retaining ring (22) are both sleeved and installed on the outer layer of the sealing joint (8).

7. The pressure transmitter according to claim 4, characterized in that, The sealing joint (8) includes a sealing base (81), on which a plurality of insulating glass blanks (82) are embedded; a metal lead wire (83) is inserted in the insulating glass blank (82), one end of the metal lead wire (83) is located in the second chamber (4) and electrically connected to the differential pressure sensor (7); the other end of the metal lead wire (83) is located outside the second chamber (4) and electrically connected to the circuit board (9).

8. The pressure transmitter according to claim 1, characterized in that, A third groove (23) is provided between the main valve block (1) and the adapter plate (2), and a third sealing ring (24) for sealing the main valve block (1) and the adapter plate (2) is provided in the third groove (23); the third groove (23) is respectively connected to the first chamber (3) and the first inlet / outlet channel (5); a fourth groove (25) is also provided between the main valve block (1) and the adapter plate (2), and a fourth sealing ring (26) for sealing the main valve block (1) and the adapter plate (2) is provided in the fourth groove (25); the fourth groove (25) is respectively connected to the second chamber (4) and the second inlet / outlet channel (6); a throttling chamber (27) is also provided between the main valve block (1) and the adapter plate (2), and a fifth sealing ring (28) for sealing the main valve block (1) and the adapter plate (2) is provided in the throttling chamber (27), and the throttling chamber (27) is located between the first inlet / outlet channel (5) and the second inlet / outlet channel (6).

9. The pressure transmitter according to claim 8, characterized in that, The throttling chamber (27) and the adapter plate (2) are provided with a pair of throttling holes (29); a first external hydraulic drive is installed between one of the throttling holes (29) and the first inlet / outlet channel (5), and a second external hydraulic drive is installed between the other throttling hole (29) and the second inlet / outlet channel (6); a sixth sealing ring (30) is provided between the first external hydraulic drive and the adapter plate (2), and a seventh sealing ring (31) is provided between the second external hydraulic drive and the adapter plate (2); the adapter plate (2) is provided with a first limiting mounting groove (32) for installing the sixth sealing ring (30), and the sixth sealing ring (30) surrounds the first inlet / outlet channel (5) and one of the throttling holes (29); the adapter plate (2) is also provided with a second limiting mounting groove (33) for installing the seventh sealing ring (31), and the seventh sealing ring (31) surrounds the second inlet / outlet channel (6) and the other throttling hole (29).

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