Duplex fluid injection sampling valve

Abstract

A duplex fluid injection sampling valve comprises a probe pipe, a first ball valve, a connecting pipe, a second ball valve and a one-way valve which are sequentially communicated in the axial direction, the connecting pipe is provided with a radial channel used for liquid circulation, a needle valve is installed at the tail end of the radial channel, the needle valve is communicated with an inclined channel which is arranged in the connecting pipe and is inclined downwards, and the one-way valve is arranged in the inclined channel. The lower end of the inclined channel is communicated with a vertical channel located in the connecting pipe, the lower end of the vertical channel is provided with a sampling opening communicated with the outside, the radial channel, the inclined channel and the vertical channel form a liquid flow channel used for liquid flow, and the needle valve is used for controlling communication and closing of the radial channel and the inclined channel. And an outer joint is arranged at the outer end of the one-way valve.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a double fluid injection sampling valve. Background Art

[0002] The sampling valve is installed on the medium pipeline to extract the medium sample. When the valve is opened, the medium flows from the sampling port into the sampling container to realize online sampling. The main disadvantages of the existing sampling valve are: in the process of sampling high-pressure, toxic and dangerous media, when the valve is opened, the high-pressure medium is easy to spray and splash out from the pressure port, causing harm to the operator and environmental pollution, and poor operating safety.

[0003] Application No. 2016207725745 in the prior art discloses a visual sampling double ball valve, which specifically includes a valve body, the valve body has an inlet valve cavity and an outlet valve cavity, and a sampling channel with the same caliber as the pipeline is provided between the inlet valve cavity and the outlet valve cavity, and balls are respectively installed in the inlet valve cavity and the outlet valve cavity to form an inlet ball valve and an outlet ball valve; mainly, a sight glass window is installed above the sampling channel, and a sampling valve is installed below the sampling channel; the sampling valve is composed of a sampling tube, a valve core, a valve stem, and a handwheel, the inlet of the sampling tube is connected to the inner cavity of the sampling channel, and a sampling port is set on one side of the middle of the sampling tube; the valve core adopts a plunger structure, the outer cylindrical surface of the plunger is dynamically sealed with the inner hole wall of the sampling tube, the lower end of the plunger is fixedly connected to the upper end of the valve stem, and the lower end of the valve stem is connected to the handwheel through a valve stem nut. Although the above-mentioned double ball valve can realize the sampling function, it cannot realize the sampling and injection functions at the same time. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a double fluid injection sampling valve:

[0005] A double fluid injection sampling valve comprises a probe tube, a first ball valve, a connecting tube, a second ball valve and a one-way valve which are axially connected in sequence. The connecting tube is provided with a radial channel for liquid circulation. A needle valve is installed at the end of the radial channel. The needle valve is connected to an oblique channel inclined downward in the connecting tube. The lower end of the oblique channel is connected to a vertical channel in the connecting tube. The lower end of the vertical channel is provided with a sampling port connected to the outside. The radial channel, the oblique channel and the vertical channel constitute a liquid flow channel for liquid circulation. The needle valve is used to control the connection and closing of the radial channel and the oblique channel. The outer end of the one-way valve is provided with an external joint.

[0006] Preferably, a horizontal end face is provided on the lower side of the connecting tube, the sampling port is provided in the middle of the horizontal end face, a blind plate is provided at the lower end of the horizontal end face which is detachably sealed therewith, an annular sealing ring surrounding the sampling port is provided between the blind plate and the horizontal end face, and the annular sealing ring is used to surround and seal the sampling port.

[0007] Preferably, the blind plate includes a middle horizontal facing portion and mounting plate portions on both sides, the horizontal facing portion protrudes outward relative to the mounting plate portion, the horizontal facing portion and the horizontal end surface are sealed and fitted to each other, and the mounting plate portion and the connecting pipe are detachably fixedly connected by provided bolts.

[0008] Preferably, the needle valve comprises a valve body and a valve needle, wherein the valve body is provided with a valve cavity communicating with a radial channel and an oblique channel, the valve needle is used to close or start the radial channel, the valve needle is threadedly sealed with a valve seat provided in the valve body, a gear is provided at the outer end of the valve needle, the gear is detachably engaged with a rotating handle, the rotating handle is used to control the rotation of the valve needle, and the valve needle controls the axial displacement of the valve needle in the valve body by rotating with the valve seat. By rotating the rotating handle, the rotating handle controls the rotation of the valve needle through the gear, and the valve needle is axially displaced relative to the valve seat during the rotation process, and when the valve needle moves forward and blocks the radial channel, the radial channel and the valve cavity are closed to each other, and when the valve needle leaves the radial channel, the radial channel and the valve cavity are connected to each other.

[0009] Preferably, the probe tube includes a needle tube body, a needle tube cover and a needle tube connection part which are connected in an integral manner in sequence. The outer wall of the needle tube body is sleeved with an annular guide block, which is made of elastic material. The needle tube body is inserted into an inner tube to be tested provided in the outside, and the outer end of the annular guide block forms an elastic sealing abutment with the wall of the inner tube to be tested, and the needle tube connection part is bolted to the first ball valve. The provision of the annular guide block can enable the needle tube to play a corresponding elastic supporting role for the needle tube body when the needle tube is inserted into the inner tube to be tested in the outside, thereby preventing the needle tube body from being deflected or resonating with the inner tube to be tested, and can also play a corresponding sealing role.

[0010] Preferably, the first ball valve and the second ball valve each include a valve stem, a valve ball and a valve seat, the valve stem is fixedly connected to the upper end of the valve ball, the valve stem of the first ball valve is longer than the valve stem of the second ball valve, the outer ends of the two valve stems are fixedly connected with a turning handle, and the valve seat is arranged on both sides of the valve ball. The valve stem lengths of the two ball valves are different to avoid interference between the two turning handles located on the same horizontal plane when rotating.

[0011] Preferably, the valve seat is sealedly connected to the matching needle tube connection part, connecting tube or one-way valve, and the valve seat is provided with an outwardly protruding annular flange on the side close to the valve ball. The annular flange is connected to the outside with an elastic member, and the elastic member exerts an elastic force on the valve seat to move toward the side of the valve ball. The inner side of the annular flange is provided with an annular spherical groove matching the valve ball.

[0012] Preferably, the one-way valve includes a valve tube body, a valve core movably arranged in the valve tube body, a spring member and an external interface. The spring member is sleeved on the valve core and generates an elastic force on the valve core to move it toward the side of the external interface. The outer end of the valve core is provided with a conical head corresponding to the inner side of the external interface. When the conical head blocks the inner side of the external interface, the external interface and the connecting pipe are in a closed state.

[0013] Beneficial effects: This product has both injection and sampling functions. When injection is required, the corresponding liquid can be injected in sequence through the external joint directly through the one-way valve, the second ball valve, the connecting pipe, the first ball valve and the probe pipe. When sampling is required, due to the anti-backflow function of the one-way valve, the medium can be guided into the connecting pipe between the first ball valve and the second ball valve, and then sampled from the sampling port through the control of the needle valve. Therefore, this product has both sampling and injection functions, and has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of an embodiment.

[0015] Figure 2 AA is a cross-sectional schematic diagram.

[0016] Figure 3 This is a schematic diagram of the needle valve installation.

[0017] Figure 4 This is a schematic diagram of the valve seat installation.

[0018] Figure 5 Schematic diagram of the probe tube installation.

[0019] : Illustrations: 1. probe tube; 2. first ball valve; 3. connecting tube; 4. second ball valve; 5. one-way valve; 6. radial channel; 7. oblique channel; 8. vertical channel; 9. sampling port; 10. needle valve; 11. external joint; 12. horizontal end face; 13. blind plate; 131. horizontal facing portion; 132. mounting plate portion; 14. annular sealing ring; 15. valve body; 16. valve needle; 17. turning handle; 18. needle tube body; 19. needle tube cover; 20. needle tube connecting portion; 21. annular guide block; 22. valve stem; 23. valve ball; 24. valve seat; 25. turning handle; 26. annular flange; 27. elastic member; 28. valve tube body; 29. ​​valve core; 30. spring member; 31. external interface; 32. conical head. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-5 The present invention is further illustrated with examples.

[0021] Example: Figure 1As shown, a double fluid injection sampling valve comprises a probe tube 1, a first ball valve 2, a connecting tube 3, a second ball valve 4 and a one-way valve 5 which are axially connected in sequence.

[0022] like Figure 2 As shown, the connecting pipe 3 is provided with a radial channel 6 for liquid circulation, and a needle valve 10 is installed at the end of the radial channel 6. The needle valve 10 is connected to the oblique channel 7 obliquely downward provided in the connecting pipe 3. The lower end of the oblique channel 7 is connected to the vertical channel 8 located in the connecting pipe 3. The lower end of the vertical channel 8 is provided with a sampling port 9 connected to the outside. The radial channel 6, the oblique channel 7 and the vertical channel 8 constitute a liquid flow channel for liquid circulation. The needle valve 10 is used to control the connection and closing of the radial channel 6 and the oblique channel 7. The outer end of the one-way valve 5 is provided with an external joint 11. The lower side of the connecting pipe 3 is provided with a horizontal end face 12, and the sampling port 9 is provided in the middle of the horizontal end face 12. The lower end of the horizontal end face 12 is provided with a blind plate 13 that is detachably sealed with it. An annular sealing ring 14 surrounding the sampling port 9 is provided between the blind plate 13 and the horizontal end face 12. The annular sealing ring 14 is used to surround and seal the sampling port 9. The blind plate 13 includes a middle horizontal facing portion 131 and mounting plate portions 132 on both sides. The horizontal facing portion 131 protrudes outward relative to the mounting plate portion 132. The horizontal facing portion 131 and the horizontal end surface 12 are sealed and fitted to each other. The mounting plate portion 132 is detachably fixedly connected to the connecting pipe 3 by means of bolts.

[0023] like Figure 3 As shown, the needle valve 10 includes a valve body 15 and a valve needle 16. The valve body 15 is provided with a valve cavity communicating with the radial channel 6 and the oblique channel 7. The valve needle 16 is used to close or start the radial channel 6. The valve needle 16 is threadedly sealed with a valve seat 24 provided in the valve body 15. A gear is provided at the outer end of the valve needle 16. The gear is detachably engaged with a rotating handle 17. The rotating handle 17 is used to control the rotation of the valve needle 16. The valve needle 16 controls the axial displacement of the valve needle 16 in the valve body 15 by rotating with the valve seat 24. By rotating the rotating handle 17, the rotating handle 17 controls the rotation of the valve needle 16 through the gear. The valve needle 16 axially displaces relative to the valve seat 24 during the rotation process. When the valve needle 16 moves forward and blocks the radial channel 6, the radial channel 6 and the valve cavity are closed to each other. When the valve needle 16 leaves the radial channel 6, the radial channel 6 and the valve cavity are connected to each other.

[0024] like Figure 1As shown, the probe tube 1 includes a needle tube body 18, a needle tube cover 19 and a needle tube connection part 20 which are connected in an integral manner in sequence. The outer wall of the needle tube body 18 is sleeved with an annular guide block 21, and the annular guide block 21 is made of elastic material. The needle tube body 18 is inserted into the inner tube to be tested provided in the outside, and the outer end of the annular guide block 21 forms an elastic sealing abutment with the wall of the inner tube to be tested, and the needle tube connection part 20 is bolted to the first ball valve 2. The provision of the annular guide block 21 can make the needle tube play a corresponding elastic supporting role for the needle tube body 18 when the needle tube is inserted into the inner tube to be tested in the outside, so as to prevent the needle tube body 18 from being deflected or resonating with the inner tube to be tested, and can also play a corresponding sealing role. The first ball valve 2 and the second ball valve 4 both include a valve stem 22, a valve ball 23 and a valve seat 24. The valve stem 22 is fixedly connected to the upper end of the valve ball 23. The length of the valve stem 22 of the first ball valve 2 is longer than that of the valve stem 22 of the second ball valve 4. The outer ends of the two valve stems 22 are fixedly connected with a turning handle 25. The valve seat 24 is arranged on both sides of the valve ball 23. The lengths of the valve stems 22 of the two ball valves are different so as to avoid interference between the two turning handles 25 located on the same horizontal plane when rotating. Figure 4 As shown, the valve seat 24 is sealed and connected to the matching needle tube connecting part 20, the connecting tube 3 or the one-way valve 5. The valve seat 24 is provided with an outwardly protruding annular flange 26 on the side close to the valve ball 23. The annular flange 26 is connected to the outside with an elastic member 27. The elastic member 27 generates an elastic force on the valve seat 24 to move toward the side of its valve ball 23. The inner side of the annular flange 26 is provided with an annular spherical groove matching the valve ball 23.

[0025] like Figure 1 As shown, the one-way valve 5 includes a valve tube body 28, a valve core 29 movably arranged in the valve tube body 28, a spring member 30 and an external interface 31. The spring member 30 is sleeved on the valve core 29 and generates an elastic force on the valve core 29 to move it toward the side of the external interface 31. The outer end of the valve core 29 is provided with a conical head 32 corresponding to the inner side of the external interface 31. When the conical head 32 blocks the inner side of the external interface 31, the external interface 31 and the connecting pipe 3 are in a closed state.

[0026] Operation principle: This application has two functions: injection and sampling. When injection is needed, the fluid is injected through the external connector 11, and is directly injected through the one-way valve 5, the second ball valve 4, the connecting pipe 3, the first ball valve 2 and the probe pipe 1 in sequence. When passing through the one-way valve 5, the elastic force of the spring member 30 of the one-way valve 5 must be overcome before continuing to flow in.

[0027] A method for injecting and sampling a double fluid injection sampling valve comprises the following steps:

[0028] During injection: open the first ball valve 2 and the second ball valve 4, inject the fluid through the external joint 11, and then directly inject through the one-way valve 5, the second ball valve 4, the connecting pipe 3, the first ball valve 2 and the probe pipe 1 in sequence;

[0029] When sampling: S1: open the first ball valve 2 and the second ball valve 4, close the needle valve 10, and then connect the product to the tube to be tested, and the fluid in the test tube flows into the product;

[0030] S2: First close the first ball valve 2, then open the second ball valve 4 and the needle valve 10, so that the fluid flows through the connecting tube 3 and then through the radial channel 6, the needle valve 10, the oblique channel 7 and the vertical channel 8 to the sampling port 9 for direct sampling.

[0031] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaust all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A double fluid injection sampling valve, Features: The invention comprises a probe tube (1), a first ball valve (2), a connecting tube (3), a second ball valve (4) and a one-way valve (5) which are arranged in axial connection in sequence. The connecting tube (3) is provided with a radial channel (6) for liquid circulation. A needle valve (10) is installed at the end of the radial channel (6). The needle valve (10) is connected to an oblique channel (7) arranged in the connecting tube and inclined downward. The lower end of the oblique channel (7) is connected to a vertical channel (8) located in the connecting tube (3). The lower end of the vertical channel (8) is provided with a sampling port (9) connected to the outside. The radial channel (6), the oblique channel (7) and the vertical channel (8) constitute a liquid flow channel for liquid circulation. The needle valve (10) is used to control the connection and closing of the radial channel (6) and the oblique channel (7). The outer end of the one-way valve (5) is provided with an external joint (11).

2. A double fluid injection sampling valve according to claim 1, Features: The connecting pipe (3) is provided with a horizontal end surface (12) at the lower side, the sampling port (9) is provided in the middle of the horizontal end surface (12), a blind plate (13) is provided at the lower end of the horizontal end surface (12) and is detachably sealed therewith, an annular sealing ring (14) surrounding the sampling port (9) is provided between the blind plate (13) and the horizontal end surface (12), and the annular sealing ring (14) is used to surround and seal the sampling port (9).

3. A double fluid injection sampling valve according to claim 2, Features: The blind plate (13) comprises a middle horizontal facing portion (131) and mounting plate portions (132) on both sides; the horizontal facing portion (131) protrudes outward relative to the mounting plate portion (132); the horizontal facing portion (131) and the horizontal end surface (12) are sealed and fitted with each other; and the mounting plate portion (132) is detachably fixedly connected to the connecting pipe (3) by means of bolts.

4. A double fluid injection sampling valve according to claim 1, Features: The needle valve (10) comprises a valve body (15) and a valve needle (16). The valve body (15) is provided with a valve cavity communicating with a radial channel (6) and an oblique channel (7). The valve needle (16) is used to close or start the radial channel (6). The valve needle (16) is threadedly sealed with a valve seat (24) provided in the valve body (15). A gear is provided at the outer end of the valve needle (16). A rotating handle (17) is detachably mounted on the gear. The rotating handle (17) is used to control the rotation of the valve needle (16). The valve needle (16) controls the axial displacement of the valve needle (16) in the valve body (15) by rotating with the valve seat (24).

5. A double fluid injection sampling valve according to claim 1, Features: The probe tube (1) comprises a needle tube body (18), a needle tube cover (19) and a needle tube connecting part (20) which are connected in sequence in an integral manner. The outer wall of the needle tube body (18) is sleeved with an annular guide block (21), and the annular guide block (21) is made of elastic material. The needle tube body (18) is inserted into an inner tube to be tested provided in the outside, and the outer end of the annular guide block (21) forms an elastic sealing abutment with the wall of the inner tube to be tested. The needle tube connecting part (20) is bolted to the first ball valve (2).

6. A double fluid injection sampling valve according to claim 1, Features: The first ball valve (2) and the second ball valve (4) both comprise a valve stem (22), a valve ball (23) and a valve seat (24); the valve stem (22) is fixedly connected to the upper end of the valve ball (23); the length of the valve stem (22) of the first ball valve (2) is longer than the length of the valve stem (22) of the second ball valve (4); the outer ends of the two valve stems (22) are fixedly connected to a turning handle (25); and the valve seat (24) is arranged on both sides of the valve ball (23).

7. A double fluid injection sampling valve according to claim 6, Features: The valve seat (24) is sealedly connected to the matching needle tube connecting part (20), the connecting tube (3) or the one-way valve (5); the valve seat (24) is provided with an outwardly protruding annular flange (26) on the side close to the valve ball (23); the annular flange (26) is connected to the outside with an elastic member (27); the elastic member (27) generates an elastic force on the valve seat (24) to move toward the side of the valve ball (23); the inner side of the annular flange (26) is provided with an annular spherical groove matching the valve ball (23).

8. A double fluid injection sampling valve according to claim 1, Features: The one-way valve (5) comprises a valve tube body (28), a valve core (29) movably arranged in the valve tube body (28), a spring member (30) and an external interface (31); the spring member (30) is sleeved on the valve core (29) and generates an elastic force on the valve core (29) to move the valve core (29) toward the side of the external interface (31); the outer end of the valve core (29) is provided with a conical head (32) corresponding to the inner side of the external interface (31); when the conical head (32) blocks the inner side of the external interface (31), the external interface (31) and the connecting pipe (3) are in a closed state.

9. A double fluid injection sampling valve according to claim 1, Features: A method for injecting and sampling a double fluid injection sampling valve comprises the following steps: During injection: the first ball valve (2) and the second ball valve (4) are opened, the fluid is injected through the external joint (11), and is directly injected through the one-way valve (5), the second ball valve (4), the connecting pipe (3), the first ball valve (2) and the probe pipe (1) in sequence; When sampling: S1: open the first ball valve (2) and the second ball valve (4), close the needle valve (10), and then connect the product to the tube to be tested, so that the fluid in the test tube flows into the product; S2: First close the first ball valve (2), then open the second ball valve (4) and the needle valve (10), so that the fluid flows through the connecting tube (3) and then through the radial channel (6), the needle valve (10), the oblique channel (7) and the vertical channel (8) to the sampling port (9) for direct sampling.

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