CN118150035A - Pressure sensor with valve carrier rod and assembly - Google Patents

Abstract

A pressure sensor mountable to a valve in a manner that does not require special control, comprising: the shell comprises a main shell, an electric connector and an end shell, wherein the electric connector and the end shell are respectively connected with the top and the bottom of the main shell in a sealing way to form an installation cavity, and the end shell is provided with a pressure hole which is internally and externally communicated; a pressure measuring element which is positioned in the mounting cavity and is arranged at one end of the inner side of the pressure hole in a sealing manner; a plurality of electrical connection terminals penetrating through the electrical connector from inside to outside, one end of the inner side of which is electrically connected to the pressure measuring element; and a pressure interface for introducing fluid to be tested into the pressure hole, wherein one end of the outer side is inwards recessed to form a matching cavity which is provided with a circular outer port and extends longitudinally, the matching cavity is provided with a channel, one end of the outer side is communicated with the matching cavity, one end of the inner side is communicated with the pressure hole, and the center of the matching cavity is provided with a valve ejector rod coaxial with the matching cavity.

Description

Pressure sensor with valve carrier rod and assembly

Technical Field

The application relates to the technical field of pressure sensors, in particular to a pressure sensor with a valve ejector rod and a component.

Background

The pressure of the pressure sensor is typically connected to a mounting port on a vessel or pipe containing the fluid to be measured to measure the pressure of the fluid to be measured. For example, in measuring a refrigerant line, a pressure sensor is typically used to measure the pressure of the refrigerant in the refrigerant line. The container is typically closed to prevent fluid leakage before the pressure sensor is installed. Thus, the pressure sensor may be mounted on the valve. But this approach requires special control of the valve to close the valve before the pressure sensor is mounted at the mounting interface and to open the valve after mounting.

Disclosure of Invention

In response to the deficiencies of the prior art, the present application provides a pressure sensor that is mounted to a valve in a manner that does not require special control.

In order to achieve the above purpose, the present application provides the following technical solutions: a pressure sensor, comprising:

The shell comprises a main shell, an electric connector and an end shell, wherein the electric connector and the end shell are respectively connected with the top and the bottom of the main shell in a sealing way to form an installation cavity, and the end shell is provided with a pressure hole which is internally and externally communicated;

a pressure measuring element which is positioned in the mounting cavity and is arranged at one end of the inner side of the pressure hole in a sealing manner;

a plurality of electrical connection terminals penetrating through the electrical connector from inside to outside, one end of the inner side of which is electrically connected to the pressure measuring element;

And a pressure interface for introducing fluid to be tested into the pressure hole, wherein one end of the outer side is inwards recessed to form a matching cavity which is provided with a circular outer port and extends longitudinally, the matching cavity is provided with a channel, one end of the outer side is communicated with the matching cavity, one end of the inner side is communicated with the pressure hole, and the center of the matching cavity is provided with a valve ejector rod coaxial with the matching cavity.

Preferably, the pressure port comprises a first portion forming the mating cavity and a second portion comprising the valve stem, an inner end of the mating cavity being connected to an inner surface of the first portion through a hole formed in the first portion coaxial with the mating cavity; the other parts of the second part, except the valve top rod, are fixedly connected with the first part and enclose at least one part of the channel together with the matching cavity and/or the inner wall of the hole.

Preferably, the second part further comprises a connecting part fixedly connected with the first part and an extending part for connecting the connecting part and the valve top rod, and at least one part of the channel is enclosed between the extending part and the inner wall of the matching cavity.

Preferably, the extension portion includes a first extension portion fixedly connected to an inner end of the valve stem, and the connection portion includes a flange formed by laterally protruding an inner end of the first extension portion.

Preferably, the first extension part is columnar, a part of the channel is enclosed between the side wall of the first extension part and the inner wall of the hole, and a gap communicated with the matching cavity is reserved between the part of the channel and the inner wall of the lower end of the hole.

Preferably, the extension part comprises a first extension part fixedly connected with one end of the inner side of the valve top rod and a second extension part formed by extending the periphery of the first extension part towards the bottom and lining the inner side wall of the matching cavity, and the connection part comprises a flange formed by transversely protruding one end of the outer side of the second extension part.

Preferably, the first portion is integrally connected or sealed in combination with the end housing.

Preferably, other parts of the second portion than the valve stem are interference fit with the first portion and together with the mating cavity and/or the inner wall of the bore enclose at least a portion of the passageway.

Preferably, the outer side wall of the second extension part and the inner wall of the matching cavity are provided with a groove communicated with the hole and a through hole penetrating through the second extension part from inside to outside.

The invention also claims an assembly comprising:

The pressure sensor described above;

The valve comprises a valve body, a valve core and a reset driving piece, wherein a valve cavity, a measuring interface which is communicated with the pressure interface of the pressure sensor in a sealing way and a control channel which is connected with the valve cavity and the measuring interface are formed in the valve body; the valve core is longitudinally arranged in the valve cavity in a sliding manner, and can open the control channel towards one side far away from the pressure sensor under the driving of the valve ejector rod of the pressure sensor, and close the control channel towards one side close to the pressure sensor under the driving of the reset driving piece.

Drawings

FIG. 1 is a schematic view of the construction of the assembly including the pressure sensor of the first preferred embodiment;

FIG. 2 is a schematic structural view of a pressure sensor according to a second preferred embodiment;

FIG. 3 is a schematic structural view of a pressure sensor according to a third preferred embodiment;

FIG. 4 is a schematic structural view of a pressure sensor of a fourth preferred embodiment;

FIG. 5 is a schematic structural view of a pressure sensor of a fifth preferred embodiment;

FIG. 6 is a schematic structural view of a pressure sensor of a sixth preferred embodiment;

In the figure: 100. a pressure sensor; 10. a channel; 110. a hole; 111. a neck; 11a, an outer port; 11b, supporting and positioning steps; 11c, flaring portion; 11. a first portion; 120. a valve ejector rod; 121a, a first extension; 121b, a second extension; 121. an extension; 122a, a flange; 122b, a flange; 122. a connection part; 123. a lining portion; 125. a groove; 126. a via hole; 127. a via hole; 128. a groove; 12. a second portion; 151. a flange; 152. a positioning part; 15a, openings; 15. a blocking member; 1a, a mating cavity; 1. a pressure interface; 211. edge pressing; 21a, a support surface; 21b, lower end; 21. an extension; 2. a main housing; 31a, a press-contact surface; 31. a shell portion; 32. an enlarged portion; 3. an electrical connector; 41. a membrane; 42. a support part; 43. an expansion section; 44. a piezoresistor; 4. a pressure measuring element; 501. an electrical connection line; 502a, a through part; 502. a circuit board; 503. an electronic component; 504. an electrical contact spring; 505. a holding base; 51. a flexible electrical connection; 52. a circuit board; 53. an electronic component; 54. an electrical connection terminal; 5. an electronic module assembly; 60. a pressure hole; 600. positioning the step surface; 61. supporting and positioning steps; 62. an annular groove; 63. an inner port; 69. a top surface; 6a, an expanded diameter part; 6a, cavity; 6b, supporting and positioning steps; 6c, an outer port; 6. an end housing; 01a, measuring channel; 01. a valve core; 02a, valve cavity; 02b, measuring interface; 02c, a first interface; 02d, a second interface; 02. a valve body; 03a, sealing surfaces; 03. a valve seat; 04. a valve stem; 05. resetting the driving piece; 200. a valve;

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. The following examples are illustrative only and are not to be construed as limiting the application. In the following description, the same reference numerals are used to designate the same or equivalent elements, and duplicate descriptions are omitted.

In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the product of the present application is conventionally put in use, or the directions or positional relationships in which those skilled in the art conventionally understand are merely for convenience of describing the present application and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present application.

In addition, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

It should be further understood that the term "and/or" as used in the present description and the corresponding claims refers to any and all possible combinations of one or more of the listed items.

As shown in fig. 1. In a first embodiment of the invention, the pressure sensor comprises a housing (not labeled), a pressure measuring element 4 and a plurality of electrical connection terminals 54. The housing comprises a main housing 2, an electrical connector 3 and an end housing 6. The electrical connector 3 and the end housing 6 are respectively hermetically connected to the top and bottom ends of the main housing 2, and enclose a mounting cavity (not labeled). The end housing 6 is provided with a pressure hole 60 penetrating inside and outside. The pressure measuring element 4 is located in the mounting cavity and is sealingly fixed to the inner end of the pressure hole 60 to measure the pressure of the fluid to be measured introduced by the pressure hole 60. In this embodiment, the connection manner of the main housing 2 and the end housing 6 and the electrical connector 3 is not limited in any way, and the connection manner may be sealed and fixed by a conventional connection manner in the prior art, for example, as shown in fig. 1, the lower end 21b of the main housing 2 may be welded to a supporting and positioning step 6b formed by the periphery of the end housing 6, the outer edge of the upper end of the main housing 2 may be protruded upwards to form a circle of extension portion 21, and the inner edge of the upper end of the main housing 2 may correspondingly form a circle of supporting surface 21a. The upper portion of the extension portion 21 is rolled inward to form a round of pressing edge 211 to press the pressing surface 31a of the top of an enlarged portion 32 formed at the bottom of the electrical connector 3 toward the bottom side, and the supporting surface 21a is supported at the bottom of the electrical connector 3 toward the top side. The connection between the crimp 31a and the bottom of the electrical connector 3 can be sealed by providing a sealing ring 30, alternatively or additionally, a sealing agent can also be applied between the crimp 31a and the crimp 211.

The pressure measuring element 4 may be a conventional pressure measuring element comprising a metal diaphragm, for example, as shown in fig. 1, the pressure measuring element 4 comprises a preferably transversely extending stainless steel diaphragm 41, the inner side of the diaphragm 41 forming a flat surface, the outer side surface of the diaphragm 41 being coupled to the pressure of the fluid to be measured introduced by the pressure port 60 and being deformed inwardly (i.e. towards the side facing away from the pressure port 60) when pressed. On the inner side surface of the membrane 41 is arranged an insulated measuring circuit, such as a wheatstone bridge, composed of piezo-resistors 44, which is electrically connected to the electronic module assembly 5 arranged in the mounting cavity for outputting electrical signals and for being supplied with power. The inner end of the pressure bore 60 may be formed with a raised inner port 63 upwardly from the top surface 69 of the end housing 6, with the edge of the membrane 41 protruding downwardly to form a loop of support 42. The support portion 42 is connected to the inner port 63 in a sealing manner downward, for example, a circle of support positioning steps 61 may be formed by protruding a middle portion of an outer wall of the inner port 63 in a lateral direction, and a lower end of the support portion 42 is welded to a top surface of the support positioning steps 61. Accordingly, an annular groove 62 is formed between the support positioning step 61 and the top surface 69 to isolate the stress generated by the end housing 6 at the time of assembly.

The top of the electrical connector 3 forms the housing part 31 connected to the flexible electrical connector 51, the electrical connector terminals 54 are fixed to the electrical connector 3, one end of the outer side thereof extends into the interior of the housing part 31, one end of the inner side thereof extends through the electrical connector 3 and into the mounting cavity and is electrically connected to the pressure measuring element 4, for example, the electronic module assembly 5 may include a circuit board 52 soldered to one end of the inner side of the electrical connector terminals 54, and the circuit board 52 is electrically connected to the measuring circuit through the flexible electrical connector 51. The circuit board 52 may be provided with electronic components 53 such as a signal conditioning chip. The edge of the membrane 41 may protrude radially outward to form a thickened extension 43.

The pressure sensor 100 further comprises a pressure port 1 for introducing a fluid to be measured into the pressure hole 60, and an outer end of the pressure port 1 is recessed inward to form a fitting chamber 1a having a circular outer port 11 a. The fitting chamber 1a extends in the longitudinal direction and has a passage 10, and an outer end of the passage 10 communicates with the fitting chamber 1a and an inner end communicates with the pressure hole 60. The center of the matching chamber 1a is provided with a valve top rod 120 coaxial with the matching chamber 1a. The pressure interface 1 comprises a first portion 11 forming a mating cavity 1a. Valve stem 120 is integrally connected to first portion 11. The passage 10 includes a bore 110 formed in the first portion 11 and laterally offset from a valve stem 120. The pressure hole 60 is preferably provided in the center of the end housing 6, and in other embodiments, the top surface of the end housing 6 may be offset from the center of the end housing 6, for example, may be disposed opposite the hole 110, such that an inner end of the hole 110 is in opposite communication with an outer end of the pressure hole 60. However, in order to facilitate processing of the end housing 6, the pressure hole 60 is preferably provided at the top center of the end housing 6, and in this case, in order to facilitate communication between the hole 110 and the pressure hole 60 in the lateral direction, the lower end of the pressure hole 60 may be enlarged to define a flat cavity 6a with the inner end of the first portion 11. At this time, the passage 10 may extend longitudinally, and its upper end is laterally communicated to the lower end of the pressure hole 60 via the chamber 6a. Wherein the outer port 6c of the end housing 6 can be sealingly connected by welding to a support positioning step 11b formed on top of the first portion 11. To facilitate connection with the end housing 6, the top of the neck 111 may be contracted relative to the bottom to form the neck 111.

The electronic module assembly 5 is not essential, but the electronic module assembly 5 may also be arranged in an external arrangement, with signal derivation and power supply only being performed via the electrical connection terminals 54.

The assembly of this embodiment includes the pressure sensor 100 described above and a valve 200 connected to the pressure sensor 100. The valve 200 includes a valve body 02, a valve element 01, and a reset driving member 05. A valve chamber 02a, a measurement port 02b in sealing communication with the pressure port 1 of the pressure sensor 100, and a control passage 03b connecting the valve chamber 02a and the measurement port 02b are formed in the valve body 02. The valve spool 01 is longitudinally slidably provided in the valve chamber 02a and is capable of opening the control passage 03b toward a side away from the pressure sensor 100 by the valve plunger 120 of the pressure sensor 100 and closing the control passage 03b toward a side closer to the pressure sensor 100 by the drive of the reset drive 05. The valve body 02 may further comprise a valve seat 03 secured to the inner port 03b of the measuring channel 01a, with a sealing surface 03a cooperating with the valve element 01. The return driver 05 may be a longitudinally extending compression spring having one end secured to the valve body 02 and the other end secured to the valve core 01. When the pressure sensor 100 is not assembled to the valve 200, the reset driving member 05 pushes the valve cartridge 01 outward to close the inner port 03b, so that the valve 200 closes the measurement passage 01a to avoid leakage of the fluid to be measured; when the pressure port 1 of the pressure sensor 100 is mounted (e.g., screwed) on the measurement port 02b, the valve stem 120 pushes the valve core 01 toward the bottom via the valve stem 04 at the top of the valve core 01 to disengage from the valve seat 03, thereby opening the measurement channel 01a, and at this time, the fluid to be measured sequentially passes through the measurement channel 01a, the mating chamber 1a, the chamber 6a, and the pressure hole 60 and is then coupled to the pressure measuring element 4. The inner wall of the mating chamber 1a can be sealed against the measuring port 02b of the valve 200, for example by an interference fit or by a sealing ring (not shown) being provided between the top of the measuring port 02b and the mating chamber 1 a.

The inner cross section of the hole 110 is not set too large, otherwise it may be damaged by the impact of the water hammer effect. Also, limited by the difficulty of machining (drilling), the internal cross section (usually circular) should not be too small.

Referring to fig. 2, the pressure sensor 100 of the second embodiment may further include a stopper 15, compared to the first embodiment. A stopper 15 may be fixed to an inner side end surface of the passage 10 for narrowing a passing cross section of the hole 110, so that the hole 110 may be relatively enlarged to facilitate processing thereof. For example, an opening 15a may be provided in the middle of the stopper 15 to communicate the pressure hole 60 with the inside of the first portion 11. The inner end of the stopper 15 may be outwardly protruded to form a collar 151 for connection with the inner end surface of the hole 110, and the collar 151 may be welded thereto. Preferably, the outer end of the stopper 15 extends outwardly to form a positioning portion 152 extending into the hole 110. The inner side surface of the flange 151 is preferably parallel to the inner side surface of the first part 11. The inner end surface of the aperture 110 preferably extends in a transverse direction, although in other embodiments it may be disposed obliquely to the transverse plane.

Please refer to fig. 3 in combination. The pressure port 1 of the pressure sensor 100 of the third embodiment may further include a first portion 11 forming the fitting chamber 1a and a second portion 12 including the valve stem 120, as compared to the first embodiment. In this way, the valve stem 120 can be relatively easily assembled to the first portion 11 after being machined. In the present embodiment, the inner side end of the fitting chamber 1a communicates to the inner side surface of the first portion 11 through a hole 110 formed in the first portion 11 coaxially with the fitting chamber 1 a. The other parts of the second part 12 than the valve stem 120 are fixedly connected to the first part 11 and together with the inner wall of the bore 110 enclose at least a part of the channel 10. For example, portions of the second portion 12 other than the valve stem 120 may be secured with the first portion 11 by interference, such as an interference fit, within the bore 110. In other aspects, it is preferred that other portions of the second portion 12 than the valve stem 120 be secured within the mating cavity 1a by an interference fit.

For example, the second portion 12 also includes a flange 122a fixedly coupled to the first portion 11 and an extension 121 connecting the flange 122a and the valve stem 120. Wherein the extension 121 may include a first extension 121a fixedly coupled to an inner end of the valve stem 120, at least a majority of the first extension 121a being located within the bore 110. The flange 122a may include a flange 122a formed by laterally protruding an inner end of the first extension 121 a. The first extension 121a encloses at least a portion of the channel 10 with the inner wall of the mating cavity 1 a. The reference numeral 125 in fig. 3 may be a hole formed in the first extension portion 121a and/or the flange 122a, or may be a portion of the channel 10 surrounded by the first extension portion 121a and/or the flange 122a and the inner side wall of the hole 110 and allowing the fluid to be measured to pass through. For example, reference numeral 125 may be representative of a generally longitudinally extending groove provided on the outer wall of the first extension 121a and/or flange 122a, or a groove formed on the inner wall of the aperture 110, or a groove defined by both portions. When the above-mentioned portion of the channel 10 is surrounded by the first extension 121a and/or the flange 122a and the inner wall of the hole 110 together, a gap (not labeled) communicating with the mating cavity 1a may be left between the hole 110 and the first extension 121 a. Preferably, the groove is provided on the outer wall of the first extension 121a and extends toward the top to the top surface of the flange 122a.

The bore 110 is preferably easily machined circular and the first extension 121a may be configured as a cylinder to transition the flange 122a and the valve stem 120, the cylinder preferably having a taper such that the bottom outer diameter of the cylinder is smaller and the top outer diameter is larger, as the bore 110 is typically larger than the outer diameter of the valve stem 120. In other embodiments, the flange 122a may be omitted, and the outer wall of the first extension 121a may be directly fixed to the inner end of the mating cavity 1a by interference, and may be axially positioned by the bottom of the mating cavity 1a (i.e., the end communicating with the hole 110).

Wherein the flange 122a includes a flange 122a formed by laterally protruding an inner end of the first extension 121a, and may be conveniently welded to an inner end face of the hole 110 by the flange 122 a. The flange 122a does not need to be particularly sealed with the inner side port of the bore 110, as the inner wall of the mating chamber 1a may be sealed with the measuring interface 02b of the valve 200.

Please refer to fig. 4 in combination. In contrast to the third embodiment, the first extension 121a of the pressure sensor 100 of the fourth embodiment is not welded to the top end (i.e., the inner end) of the hole 110, but is welded to the outer port 11a, and therefore, the extension 121 is not located in the hole 110 but is located in the fitting chamber 1 a. At this time, the extension portion 121 includes, in addition to the first extension portion 121a, a second extension portion 121b formed by extending the periphery of the first extension portion 121a toward the bottom and lining the inner sidewall of the mating cavity 1 a. When connected to the measuring port 02b of the valve 200, the inner wall of the second extension 121b may be cooperatively connected to the outer wall of the measuring port 02 b. The first extension portion 121a may have a plate shape, and a through hole 126 is provided thereon to communicate the mating cavity 1a with the hole 110. Preferably, the bottom of the hole 110 may form a flared portion 11c to facilitate communication with the via 126.

Please refer to fig. 5 in combination. In comparison with the fourth embodiment, the bottom of the end housing 6 of the pressure sensor 100 of the fifth embodiment is integrally connected to the top of the first portion 11, and the cavity 6a is penetrated up and down through the hole 110, and preferably has a shape and size completely equal to those of the first portion. At this time, in addition to the via hole 126 being opened on the first extension portion 121a as in the fourth embodiment, a through via hole 127 may be opened on the second extension portion 121b instead of or in addition to, while a groove 128 is provided on the outer wall of the via hole 127 to connect the via hole 127 and the flare portion 11c.

In the present embodiment, the pressure measuring element 4 may also be a semiconductor element, and the pressure measuring element 4 includes a membrane 41, the edge of which is sealingly connected to the inner side end of the pressure hole 60. The electronics module assembly 5 may include a circuit board 502 secured to the top surface 69 and one side surface of the membrane 41 may be made up of piezoresistors by ion diffusion and the measuring circuit may be constituted by the piezoresistors. The measurement circuit is electrically connected to the circuit board 502 by an electrical connection 501. The circuit board 502 is provided with a through portion 502a which accommodates the pressure measuring element 4 and penetrates both sides of the circuit board 502. The inner side surface of the circuit board 502 may also be provided with electronic components 503 such as a signal conditioning chip. The circuit board 502 and the electrical connection terminals 54 are electrically connected, and for example, one end of the inner side of the electrical connection terminals 54 may be electrically connected to a plurality of electrical connection portions provided on the circuit board 502 by electrical contact springs 504. Wherein a holder 505 may be fixed to the inner surface of the circuit board 502 to hold the electrical contact spring 504. The electrical contact spring 504 may be a spring having a tapered head at the top, and the holder 505 may have a pressing surface formed therein for pressing against the tapered head toward the circuit board 502 side. Wherein the upper end of the main housing 2 may be embedded in the electrical connector 3 instead of being connected and sealed between the crimp and the electrical connector 3.

Please refer to fig. 6 in combination. In comparison with the first embodiment, the outer port 6c of the end housing 6 of the pressure sensor 100 of the sixth embodiment is integrally connected with the top of the first portion 11, the chamber 6a communicates with the hole 110 up and down, and the cross section of the hole 110 is larger than that of the chamber 6 a; more particularly, both the aperture 110 and the cavity 6a may be circular. The first extension 121a is secured within the aperture 110 by an interference fit. In other embodiments, it may be preferable to form a locating step 600 at the junction of the bore 110 and the chamber 6a on the side facing the outer port 11 a. The second portion 12 includes a valve stem 120 and an extension 121 integrally connected to the top of the valve stem 120, the extension 121 including a first generally cylindrical extension 121a. And is stopped by the positioning step surface 600 toward the bottom side, thereby axially positioning the first extension 121a. The outer wall of the first extension 121a is recessed to form a groove 125, and the groove 125 and the inner wall of the hole 110 enclose a portion of the passage 10, the top end (inner side end) of which communicates with the chamber 6a, and the bottom end (outer side end) of which communicates with the mating chamber 1a. The groove 125 may be replaced by a notch formed in the sidewall of the first extension 121a.

The scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents are to be construed as being included in the present disclosure.

Claims (10)

1. A pressure sensor with a valve stem, comprising:

The shell comprises a main shell (2), an electric connector (3) and an end shell (6), wherein the electric connector (3) and the end shell (6) are respectively and hermetically connected to the top and the bottom of the main shell (2) to form a mounting cavity, and the end shell (6) is provided with a pressure hole (60) which is internally and externally communicated;

A pressure measuring element (4) which is positioned in the mounting cavity and is arranged at one end of the inner side of the pressure hole (60) in a sealing way;

A plurality of electrical connection terminals (54) penetrating the electrical connector (3) inside and outside, and having one end inside thereof electrically connected to the pressure measuring element (4);

And a pressure port (1) for introducing fluid to be measured into the pressure hole (60), wherein one end of the outer side is recessed inwards to form a matching cavity (1 a) which is provided with a circular outer port (11 a) and extends longitudinally, the matching cavity is provided with a channel (10) of which one end of the outer side is communicated with the matching cavity (1 a) and one end of the inner side is communicated with the pressure hole (60), and a valve top rod (120) coaxial with the matching cavity (1 a) is arranged in the center of the matching cavity (1 a).

2. Pressure sensor with valve stem according to claim 1, characterized in that the pressure interface (1) comprises a first part (11) forming the fitting chamber (1 a) and a second part (12) comprising the valve stem (120), the inner side end of the fitting chamber (1 a) being connected to the inner side surface of the first part (11) through a hole (110) formed in the first part (11) coaxial with the fitting chamber (1 a); the other parts of the second part (12) than the valve plunger (120) are fixedly connected with the first part (11) and jointly enclose at least a part of the channel (10) with the mating cavity (1 a) and/or the inner wall of the hole (110).

3. Pressure sensor with a valve stem according to claim 2, characterized in that the second part (12) further comprises a connection part (122) fixedly connected with the first part (11) and an extension part (121) connecting the connection part (122) and the valve stem (120), the extension part (121) enclosing at least a part of the channel (10) with the inner wall of the mating chamber (1 a).

4. A pressure sensor with a valve stem according to claim 3, characterized in that the extension (121) comprises a first extension (121 a) fixedly connected to the inner end of the valve stem (120), the connection (122) comprising a flange (122 a) formed by a lateral protrusion of the inner end of the first extension (121 a).

5. The pressure sensor with valve stem according to claim 4, characterized in that the first extension (121 a) is cylindrical, the side wall of which encloses a portion of the channel (10) with the inner wall of the hole (110), and a gap is left between the portion of the channel (10) and the inner wall of the lower end of the hole (110) communicating with the mating cavity (1 a).

6. A pressure sensor with a valve stem according to claim 3, characterized in that the extension (121) comprises a first extension (121 a) fixedly connected to the inner end of the valve stem (120) and a second extension (121 b) extending towards the bottom from the periphery of the first extension (121 a) and lining the inner side wall of the mating cavity (1 a), and the connection (122) comprises a flange (122 a) protruding laterally from the outer end of the second extension (121 b).

7. Pressure sensor with a valve stem according to claim 2, characterized in that other parts of the second part (12) than the valve stem (120) are interference fit with the first part (11) and enclose together with the inner wall of the fitting cavity (1 a) and/or the bore (110) at least a part of the channel (10).

8. Pressure sensor with valve carrier rod according to claim 7, characterized in that the first part (11) is connected integrally or in sealed combination with the end housing (6).

9. The pressure sensor with valve lift rod according to claim 7, characterized in that the outer side wall of the second extension (121 b) and the inner wall of the mating cavity (1 a) are provided with a groove (128) communicating with the hole (110) and a via hole (127) penetrating the second extension (121 b) inside and outside.

10. An assembly, comprising:

the pressure sensor (100) of any one of claims 1 to 9;

The valve (200) comprises a valve body (02), a valve core (01) and a reset driving piece (05), wherein a valve cavity (02 a), a measuring interface (02 b) communicated with a pressure interface (1) of the pressure sensor (100) in a sealing way and a control channel (03 b) for connecting the valve cavity (02 a) with the measuring interface (02 b) are formed in the valve body (02); the valve core (01) is longitudinally slidably arranged in the valve cavity (02 a) and can open the control channel (03 b) towards the side far away from the pressure sensor (100) under the driving of the valve top rod (120) of the pressure sensor (100), and close the control channel (03 b) towards the side close to the pressure sensor (100) under the driving of the reset driving piece (05).