A pressure transmitter with dual flow modes

Abstract

The present invention provides a dual-flow mode pressure transmitter, in which a conversion block with a sliding seal and a cylindrical shape is accommodated in the middle hole section of the base through hole, and the conversion block is provided with two through holes with different diameters: a non-throttling hole and a throttling hole. The axis lines of the two through holes are respectively parallel to the axis line of the conversion block and are respectively located at eccentric positions on both sides of the axis line of the conversion block; the lower end opening of the pressure-sensing hole of the pressure-sensing element is provided at an eccentric position on the lower end face of the pressure-sensing element, and when the conversion block is rotated to the non-throttling hole or the throttling hole is located below the pressure-sensing hole, the upper end opening of the non-throttling hole or the throttling hole can be directly opposite to the lower end opening of the pressure-sensing hole. The present invention has a simple structure and reliable performance, and can achieve compatibility and meet the testing requirements of both throttling and non-throttling flow modes through a pressure transmitter.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure transmitters, and in particular relates to a pressure transmitter capable of switching between two flow modes, throttling and non-throttling. Background Art

[0002] A pressure transmitter is a device that measures the pressure of a medium. Different operating conditions have different requirements for the inlet pressure and flow rate of the pressure transmitter. Existing pressure transmitters are divided into two types according to their flow control: non-throttling and throttling. The two types of pressure transmitters can only meet the corresponding requirements respectively and are often not compatible. Throttling pressure transmitters usually directly make the pressure inlet hole into a small hole for throttling. This method is irreversible and cannot cope with non-throttling conditions. Non-throttling pressure transmitters make the pressure inlet hole into a large hole. If you want to convert a non-throttling pressure transmitter into a throttling type, you need to assemble a throttling valve with a small hole on the large hole. This method is not only time-consuming and labor-intensive to repeatedly disassemble and assemble, but also poses hidden dangers such as poor tightening. Therefore, it is necessary to design a pressure transmitter that can be compatible and reliably meet the needs of both throttling and non-throttling flow modes. Summary of the Invention

[0003] In view of this, the present invention proposes a dual-flow mode pressure transmitter, specifically:

[0004] A dual-flow mode pressure transmitter, wherein the base through-hole of the base is a stepped through-hole composed of a lower hole section, a middle hole section, and an upper hole section, which are connected from bottom to top and have successively increasing hole diameters. The pressure-sensing element is fixed to the upper hole section, and the middle hole section accommodates a cylindrical conversion block that is in sliding and sealing engagement with the conversion block and can rotate about its own axis.

[0005] The conversion block is provided with two through holes of different diameters: a non-throttling hole and a throttling hole. The axis lines of the two through holes are respectively parallel to the axis line of the conversion block and are respectively located at eccentric positions on both sides of the axis line of the conversion block.

[0006] The lower end opening of the pressure-sensing hole of the pressure-sensing element is opened at an eccentric position of the lower end surface of the pressure-sensing element, and when the conversion block rotates to the non-throttling hole or the throttling hole is located below the pressure-sensing hole, the upper end opening of the non-throttling hole or the throttling hole can be opposite to the lower end opening of the pressure-sensing hole.

[0007] The upper end face of the conversion block is provided with two orifice grooves which surround the upper end openings of the non-throttling hole and the throttling hole respectively. An O-ring is installed in each orifice groove. When the upper end face of the conversion block abuts against the lower end face of the pressure-sensing element, the O-ring in the orifice groove seals the orifice.

[0008] An annular groove is provided on the upper portion of the cylindrical side surface of the conversion block, and an O-ring is installed in the annular groove to achieve sliding sealing cooperation between the conversion block and the middle hole section.

[0009] The lower end face of the pressure-sensing element used to block the upper end opening of the base through hole is also designed as a stepped surface. The interface between the low end face and the high end face of the stepped surface coincides with the rotation axis of the conversion block. The low end face can abut against the upper end face of the conversion block, and when the low end face abuts against the upper end face of the conversion block, a gap is left between the high end face and the upper end face of the conversion block, and the lower end opening of the pressure-sensing hole is opened on the high end face.

[0010] The low-position end surface and the high-position end surface each occupy half of the lower end surface of the pressure-sensitive element.

[0011] The conversion block can also slide up and down along its axis in the middle hole section. The upward sliding of the conversion block is limited by the lower end face of the pressure-sensitive element, and the downward sliding is limited by the bottom annular shoulder between the middle hole section and the lower hole section.

[0012] The base is provided with a shift limit strip protruding into the hole on the wall of the middle hole section of the base through hole. An arc groove extending along the circumferential direction is provided on the lower part of the cylindrical side surface of the conversion block, and the arc groove forms an arc-shaped notch on the lower end surface of the conversion block for the shift limit strip to extend into. The groove walls at both ends of the arc groove in the circumferential direction can respectively abut against the shift limit strip for limiting when the conversion block rotates, and when the conversion block rotates to one of the groove walls at both ends abutting against the shift limit strip, the corresponding non-throttling hole or throttling hole can be located directly below the pressure sensing hole.

[0013] The shift limit strip extends upward from the bottom annular shoulder, and the extension length is sufficient to allow the shift limit strip to abut against the groove walls at both ends of the arc groove when the upper end surface of the conversion block abuts against the pressure-sensitive element.

[0014] A positioning key is provided on the bottom annular shoulder in the middle hole section of the base, and corresponding positioning key slots are provided on the lower end surface of the conversion block: a throttling positioning key slot and a non-throttling positioning key slot.

[0015] The non-throttling hole is also provided with an internal thread.

[0016] The present invention has a simple structure and reliable performance, and can achieve compatibility and meet the testing requirements of both throttling and non-throttling flow modes through a single pressure transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without making any creative efforts.

[0018] Figure 1 is a cross-sectional schematic diagram of the throttling mode state of the present invention;

[0019] Figure 2 is a cross-sectional schematic diagram of the non-throttling mode state of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the base, (A) is its cross-sectional view, (B) is its top view;

[0021] Figure 4 Schematic diagram of the structure of the conversion block, (A) is its three-dimensional view, (B) is its bottom view from the perspective of the lower end face;

[0022] Figure 5 It is an exploded view of the present invention.

[0023] The reference numerals in the figure are: base 1; conversion block 2; pressure-sensitive element 3; circuit board 4; housing 5; cable 6; O-ring one 7; O-ring two 8; O-ring three 9; positioning key 1-1; fan ring protrusion 1-2; non-throttling hole 2-1; throttling hole 2-2; throttling positioning key slot 2-3; non-throttling positioning key slot 2-4; pressure-sensitive hole 3-1. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of clearly explaining the technical solutions, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] As shown in the figure, the pressure transmitter of the present invention mainly includes the following components: base 1, conversion block 2, pressure sensing element 3, circuit board 4, housing 5 and cable 6, wherein,

[0029] See also Figure 4 As shown, the conversion block 2 is cylindrical as a whole and has two through holes with different diameters: a non-throttling hole 2-1 and a throttling hole 2-2. The axis lines of the two through holes are parallel to the axis line of the conversion block 2, and the two through holes are located at eccentric positions on both sides of the axis line of the conversion block 2.

[0030] The upper end surface of the conversion block 2 is provided with two orifice grooves surrounding the upper end openings of the non-throttling hole 2-1 and the throttling hole 2-2, respectively, for installing O-ring 1 7 and O-ring 2 8 respectively; the upper part of the cylindrical side surface of the conversion block 2 is provided with an annular groove 2-9 for installing O-ring 3 9.

[0031] See also Figure 3 As shown, the base 1 has a base through hole 10, which is designed as a stepped through hole, which is composed of a lower hole section 101, a middle hole section 102 and an upper hole section 103 connected in sequence from bottom to top. The aperture of the middle hole section 102 is larger than the aperture of the lower hole section 101, and a bottom annular shoulder 104 is formed at the connection between the middle hole section 102 and the lower hole section 101; the aperture of the upper hole section 103 is larger than the aperture of the middle hole section 102, and an upper annular shoulder 105 is formed at the connection between the upper hole section 103 and the middle hole section 102.

[0032] See also Figure 1 or Figure 2 as well as Figure 5 As shown, the conversion block 2 can enter the middle hole section 102 through the opening formed by the upper hole section 103 , and the middle hole section 102 of the base through hole 10 can accommodate the conversion block 2 and be in sealing and sliding cooperation with the conversion block 2 .

[0033] Specifically, the sealed sliding fit is achieved by an O-ring 3-9 mounted on the annular groove 2-9 on the cylindrical side of the conversion block 2; in addition, the sliding fit described here includes two modes. The first is that the conversion block 2 can slide in the middle hole section 102 around the axis of its cylinder, and the second is that the conversion block 2 can slide up and down in the middle hole section along its axis, that is, the axis of the hole of the middle hole section.

[0034] In order to realize the second type of sliding mentioned above and prevent the conversion block 2 from falling out, the downward sliding limit of the conversion block 2 is borne by the bottom annular shoulder 104, and the upward sliding limit of the conversion block 2 is borne by the lower end face of the pressure-sensitive element 3 fixed to the upper hole section 103 of the base 1, that is, the conversion block 2 can slide up and down in the middle hole section, and is respectively supported and limited by the lower end face of the pressure-sensitive element 3 and the bottom annular shoulder 104.

[0035] Specifically, the pressure-sensitive element 3 is embedded in the upper hole section 103 of the base through hole 10 of the base 1 , and the pressure-sensitive element 3 and the base 1 are assembled into one body by laser welding.

[0036] The lower end surface of the pressure-sensitive element 3 also serves to limit the upper portion of the conversion block 2 as it slides up and down. At the same time, the lower end surface of the pressure-sensitive element 3 is also sealed at the upper end opening of the base through hole 10 of the base 1. This sealing may be sealed or not. Even if it is not sealed, it will not affect the use effect. Please see the subsequent instructions for details.

[0037] In the present invention, the position of the pressure-sensitive hole 3-1 of the pressure-sensitive element 3 has special requirements. For details, see Figure 1 and Figure 2 As shown, the opening position of the lower end of the pressure-sensing hole 3-1 on the lower end surface of the pressure-sensing element 3 is located at an eccentric position between the rotation axis of the conversion block 2 and the hole wall of the middle hole section 102. Preferably, the opening position of the pressure-sensing hole 3-1 should meet the requirement that when the conversion block 2 rotates to the point where the non-throttling hole 2-1 and the throttling hole 2-2 are respectively located below the pressure-sensing hole 3-1, the upper end openings of the non-throttling hole 2-1 and the throttling hole 2-2 can be respectively aligned with the pressure-sensing hole 3- 1 and the lower end openings of the lower end surface of the pressure-sensing element 3 are respectively opposite to each other; that is, when the conversion block 2 is rotated so that the non-throttling hole 2-1 is located directly below the pressure-sensing hole 3-1, the upper end opening of the non-throttling hole 2-1 can be rotated to be opposite to the lower end opening of the pressure-sensing hole 3-1; when the conversion block 2 is rotated so that the throttling hole 2-2 is located directly below the pressure-sensing hole 3-1, the upper end opening of the throttling hole 2-2 can be rotated to be opposite to the lower end opening of the pressure-sensing hole 3-1.

[0038] In order to eliminate processing errors, ensure smooth medium transmission and improve reliability, the lower end surface of the pressure-sensitive element 3 used to block the upper end opening of the base through hole 10 is also designed as a stepped surface, see Figure 1 Especially Figure 2 As shown, the interface 333 between the lower end surface 332 and the upper end surface 331 of the stepped surface coincides with the rotation axis of the conversion block 2, and the lower end opening of the pressure-sensing hole 3-1 is opened on the upper end surface 331. Preferably, the lower end surface 332 and the upper end surface 331 of the stepped surface each occupy half of the lower end surface of the pressure-sensing element 3. Based on the above structural design, as Figure 1 and Figure 2 As shown, when the upper end face of the conversion block 2 is in contact with the low end face 332 of the stepped surface at the lower end of the pressure-sensitive element 3, the gap between the high end face 331 and the upper end face of the lower conversion block 2 forms a transition cavity 32. Therefore, even if there is a processing error or the conversion block deflects during upward sliding, resulting in the pressure-sensitive hole 3-1 and the throttling block 2-1 or non-throttling hole 2-2 below being misaligned, the transition cavity 32 can be used as an intermediate transition to ensure smooth medium transmission, thereby improving reliability.

[0039] See also Figure 3 As shown, the base 1 is provided with a shift limit strip 1-2 protruding into the hole on the wall of the middle hole section 102 of the base through hole 10, correspondingly, see Figure 4 As shown, an arc-shaped groove 25 extending in the circumferential direction is provided at the lower part of the cylindrical side surface of the conversion block 2. The arc-shaped groove 25 forms an arc-shaped notch on the lower end surface of the conversion block 2, so that when the conversion block 2 is assembled and enters the middle hole section 102, the shift limit strip 1-2 can extend into the arc-shaped groove 25 through this notch. The groove walls 251 and 252 at both ends of the arc-shaped groove 25 in the circumferential direction can respectively abut against the shift limit strip 1-2 for limitation, and the positions of the groove walls 251 and 252 at both ends should meet the requirements that when the conversion block 2 is rotated to one of the groove walls 251 and 252 at both ends abut against the shift limit strip 1-2, the corresponding non-throttling hole 2-1 and throttling hole 2-2 are respectively located directly below the pressure-sensing hole 3-1. Specifically, as shown in FIG. Figure 1 As shown, when the conversion block 2 rotates until the groove wall 252 at one end contacts the shift limit bar 1-2, the corresponding throttle hole 2-2 is located directly below the pressure-sensing hole 3-1; Figure 2 As shown, when the conversion block 2 rotates until the other end groove wall 251 contacts the shift limit bar 1-2, the corresponding non-throttling hole 2-1 is located directly below the pressure-sensing hole 3-1. That is, the two end groove walls 251 and 252 correspond to the two gears of the conversion block 2.

[0040] Preferably, the shift limit strip 1-2 extends upward from the bottom annular shoulder 104, and the extension length is sufficient to ensure that when the upper end surface of the conversion block 2 abuts against the pressure-sensitive element 3, the shift limit strip 1-2 can also abut against the two end groove walls 251 and 252 respectively, so as to avoid failure of the shift limit function.

[0041] Furthermore, in order to prevent the conversion block 2 from rotating arbitrarily in the middle hole section 102 when assembling the pressure transmitter, see Figure 3As shown, a positioning key 1-1 is provided in the middle hole section 102 of the base 1 on the bottom annular shoulder 104 at a position 90 degrees from the shift limit bar 1-2. Figure 4 As shown, corresponding positioning key grooves are respectively provided at the corresponding positions of the lower end surface of the conversion block 2: a throttling positioning key groove 2-3 and a non-throttling positioning key groove 2-4. Moreover, since the distance between the bottom annular shoulder 104 of the base 1 and the lower end surface limit surface of the pressure-sensitive element 3 is slightly larger than the height of the conversion block 2, the conversion block 2 can slide up and down along its axis, that is, the axis of the hole of the middle hole section. After the state (gear) switching is completed, that is, the conversion block 2 is rotated to the required gear, the conversion block 2 can be forced to move downward so that the positioning key 1-1 of the base 1 is inserted into the corresponding positioning key groove of the conversion block 2. This can effectively prevent the conversion block 2 from rotating arbitrarily to an undesirable position in the base when assembling the pressure transmitter (especially when there is torque).

[0042] The assembly process of the present invention is as follows: after the three O-rings are respectively assembled into the corresponding grooves on the conversion block 2, the conversion block 2 is pressed into the base 1, and the pressure-sensitive element 3 and the base 1 are assembled into one by laser welding, wherein the pressure-sensitive element 3 and the base 1 are axially and radially positioned before welding, and the shell 5 and the pressure-sensitive element 3 are also assembled into one by laser welding. The circuit board 4 is soldered to the pins of the pressure-sensitive element 3 and the wires of the cable 6 through its own soldering pads to realize the path connection of the signal transmission. The cable 6 is bonded to the through hole at the top of the shell 5. At this point, the product assembly is completed.

[0043] Working principle: Since the annular groove on the cylindrical side of the conversion block 2 is equipped with an O-ring 39 to form a seal with the inner wall of the middle hole section of the central through hole of the base 1, the measuring medium can only pass through the non-throttle hole 2-1 or the throttle hole 2-2 of the conversion block 2 to reach the pressure-sensing hole 3-1 of the pressure-sensing element 3. Due to the matching relationship between the shift limit bar 1-2 and the groove walls 251 and 252 at both ends of the arc groove 25, the conversion block 2 can only rotate half a circle (the actual rotation angle is slightly less than 180°), and there are two end positions (gear positions). In the first end position (see Figure 1 ) When detecting pressure, the medium first contacts the lower end face of the conversion block 2, and the pressure will push the conversion block 2 to its upper end face and abut against the lower end face of the pressure-sensitive element 3. The O-ring 7 placed on the upper end face of the conversion block 2 is squeezed to form a seal for the upper end opening of the non-throttling hole 2-1, and the lower end face of the pressure-sensitive element 3 is a stepped surface. The lower end face of the stepped surface can only press half of the conversion block 2. The pressure-sensitive hole 3-1 is located on the high end face. The gap between the high end face and the upper end face of the conversion block 2 forms a transition cavity 32. At this time, the upper end opening of the throttling hole 2-2 can transmit the medium pressure to the pressure-sensitive hole 3-1 of the pressure-sensitive element through the transition cavity 32, and the throttling effect takes effect. This gear is the throttling state; similarly, in the other end position (see Figure 2) When detecting pressure, the O-ring 28 placed on the upper end surface of the conversion block 2 is squeezed to form a seal on the upper end opening of the throttling hole 2-2. The non-throttling hole 2-1 can transmit the medium pressure to the pressure-sensing hole 3-1 of the pressure-sensing element through the transition chamber 32, and the throttling effect fails. This gear is in the non-throttling state.

[0044] It is worth mentioning that before the medium pressure fills the pressure-sensing hole 3-1, the pressure above the conversion block 2 is smaller than that below, and because the lower end face of the pressure-sensing element is a stepped surface, the force-bearing area of ​​the upper end face of the conversion block 2 (that is, the area covered by the transition cavity) is also smaller than that of the lower end face. The conversion block 2 is always subjected to upward pressure and its position does not change, that is, the medium reaching 3-1 is always throttled. After the medium pressure fills the pressure-sensing hole 3-1, the upper and lower pressures of the conversion block 2 are equal, but under the damping effect of the O-ring 3 9, the position of the conversion block 2 hardly changes.

[0045] Since the diameter of the non-throttling hole 2-1 is larger than that of the throttling hole 2-2, when switching between the two states, a rod-like tool can be used to rotate the conversion block 2 by inserting it into the non-throttling hole 2-1 and turning it.

[0046] Forcing the conversion block 2 to move downward can be achieved by using the rod-like tool mentioned above to act on the non-throttling hole 2-1, or by using a tool such as a magnet, or by other methods.

[0047] Furthermore, in order to facilitate the use of rod tools to act on the non-throttling hole 2-1 to achieve the movement of the conversion block 2, the non-throttling hole 2-1 can also be provided with an internal thread, and the rod tool is provided with a corresponding external thread, so that the connection between the two can be stabilized by screw connection.

[0048] Based on the above principles, the present invention can realize the switching of two different flow channels, throttling holes and non-throttling holes, without the need for disassembly and assembly, and can reliably and reversibly respond to different needs and different working conditions. At the same time, the structure is simple and compact, and can be put into mass production on standardized products.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual flow mode pressure transmitter, characterized in that: The base through hole (10) of the base (1) is a stepped through hole integrally formed by a lower hole section (101), a middle hole section (102) and an upper hole section (103) which are connected in sequence from bottom to top and have increasing hole diameters. The pressure-sensing element (3) is fixed on the upper hole section (103). The middle hole section (102) contains a conversion block (2) which is in a cylindrical shape and is in sliding sealing cooperation with the conversion block (2). The conversion block (2) can rotate around its own axis. The conversion block (2) is provided with two through holes of different diameters: a non-throttling hole (2-1) and a throttling hole (2-2). The axis lines of the two through holes are respectively parallel to the axis line of the conversion block (2) and are respectively located at eccentric positions on both sides of the axis line of the conversion block. The lower end opening of the pressure-sensing hole (3-1) of the pressure-sensing element (3) is opened at an eccentric position on the lower end surface of the pressure-sensing element (3), and when the conversion block (2) rotates to the point where the non-throttling hole (2-1) or the throttling hole (2-2) is located below the pressure-sensing hole (3-1), the upper end opening of the non-throttling hole (2-1) or the throttling hole (2-2) can be directly opposite to the lower end opening of the pressure-sensing hole (3-1); The upper end surface of the conversion block (2) is provided with two orifice grooves respectively surrounding the upper end openings of the non-throttling hole (2-1) and the throttling hole (2-2). An O-ring is installed in each orifice groove. When the upper end surface of the conversion block (2) abuts against the lower end surface of the pressure-sensitive element, the O-ring in the orifice groove seals the orifice. An annular groove (2-9) is provided on the upper portion of the cylindrical side surface of the conversion block (2), and an O-ring is installed in the annular groove for achieving sliding sealing cooperation between the conversion block (2) and the middle hole section.

2. A dual flow mode pressure transmitter according to claim 1, characterized in that: The lower end surface of the pressure-sensing element (3) for blocking the upper end opening of the base through hole (10) is also designed as a stepped surface. The interface (333) between the lower end surface (332) and the upper end surface (331) of the stepped surface coincides with the rotation axis of the conversion block (2). The lower end surface (332) can abut against the upper end surface of the conversion block (2). When the lower end surface (332) abuts against the upper end surface of the conversion block (2), a gap is left between the upper end surface (331) and the upper end surface of the conversion block (2). The lower end opening of the pressure-sensing hole (3-1) is opened on the upper end surface (331).

3. The dual flow mode pressure transmitter according to claim 2, characterized in that: The low-position end surface (332) and the high-position end surface (331) each occupy half of the lower end surface of the pressure-sensitive element (3).

4. The dual flow mode pressure transmitter according to claim 1, characterized in that: The conversion block (2) can also slide up and down along its axis in the middle hole section. The upward sliding of the conversion block (2) is limited by the lower end surface of the pressure-sensitive element (3), and the downward sliding is limited by the bottom annular shoulder (104) between the middle hole section and the lower hole section.

5. A dual flow mode pressure transmitter according to claim 1 or 4, characterized in that: The base is provided with a shift limit strip (1-2) protruding into the hole on the hole wall of the middle hole section of the base through hole. The lower part of the cylindrical side surface of the conversion block (2) is provided with an arc groove (25) extending in the circumferential direction, and the arc groove (25) forms an arc-shaped notch on the lower end surface of the conversion block (2) for the shift limit strip (1-2) to extend into. The groove walls (251, 252) at both ends of the arc groove (25) in the circumferential direction can respectively abut against the shift limit strip (1-2) when the conversion block (2) rotates, and when the conversion block rotates until one of the groove walls at both ends abuts against the shift limit strip, the corresponding non-throttling hole or throttling hole can be located directly below the pressure sensing hole.

6. The dual flow mode pressure transmitter according to claim 5, characterized in that: The shift limit strip (1-2) extends upward from the bottom annular shoulder, and the extension length satisfies that when the upper end surface of the conversion block abuts the pressure-sensitive element, the shift limit strip can also abut against the groove walls at both ends of the arc groove (25).

7. The dual flow mode pressure transmitter according to claim 4, characterized in that: A positioning key (1-1) is provided on the bottom annular shoulder in the middle hole section of the base, and corresponding positioning key slots are provided on the lower end surface of the conversion block: a throttling positioning key slot (2-3) and a non-throttling positioning key slot (2-4).

8. The dual flow mode pressure transmitter according to claim 1, characterized in that: The non-throttling hole (2-1) is also provided with an internal thread.

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