Reflow joint

Abstract

The utility model relates to the technical field of hydraulic pump airtight tests, and provides a backflow connector and a connector which is connected to a hydraulic pump and used for being connected with a filter, the connector is provided with a liquid outlet and a liquid inlet, the liquid outlet is annularly formed in the peripheral side of the liquid inlet, and the backflow connector comprises a shell and a core body. Wherein the shell comprises a peripheral side wall and a bottom wall, the peripheral side wall is of a closed annular structure, and the bottom wall is arranged at one axial end of the peripheral side wall; the core body is inserted into the shell and is relatively fixed with the shell, the outer peripheral wall of the core body and the inner peripheral wall of the shell are arranged at intervals to form a liquid discharging cavity, the core body is provided with a liquid inlet cavity communicated with the liquid discharging cavity, and fluid can sequentially flow through the liquid discharging opening, the liquid discharging cavity, the liquid inlet cavity and the liquid inlet. Therefore, when the air tightness of the hydraulic pump is detected, the backflow connector can be used for replacing the filter, so that fluid in the hydraulic pump can return to the hydraulic pump after passing through the backflow connector, and the influence of the sealing performance of the filter and / or the sealing performance between the filter and the hydraulic pump is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pump airtightness testing, in particular to a reflux joint. Background Art

[0002] The air tightness test is a test that uses gas as the pressurized medium to prevent leakage of pressure vessels. Generally, dry, clean air, nitrogen or other inert gases are used as fluids to pass into the container to be tested.

[0003] When a hydraulic pump with a filter interface is tested for air tightness, its filter interface is generally connected to a filter to form a complete and closed circuit. Firstly, during the test, the fluid entering does not need to be filtered by the filter and is always in an idle state; secondly, the air tightness test of the hydraulic pump is actually the air tightness of the hydraulic pump structure itself. When the filter is connected, the air tightness of the filter itself and the air tightness of the connection between the filter and the hydraulic pump will affect the test results.

[0004] Therefore, a reflux joint is urgently needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a reflux joint which can replace a filter and connect with the hydraulic pump when the hydraulic pump is tested for air tightness, thereby eliminating the influence of the filter itself and / or the sealing between the filter and the hydraulic pump.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A reflux joint is connected to an interface of the hydraulic pump for connecting to a filter, the interface being provided with a liquid discharge port and a liquid inlet, the liquid discharge port being formed in an annular shape on the outer peripheral side of the liquid inlet, and the reflux joint comprising:

[0008] A housing, the housing comprising a peripheral side wall and a bottom wall, the peripheral side wall being a closed annular structure, and the bottom wall being arranged at one axial end of the peripheral side wall;

[0009] The core body is inserted into the shell and fixed relatively to the shell. The outer peripheral wall of the core body and the inner peripheral wall of the shell are spaced apart to form a drainage cavity. The core body is provided with a liquid inlet cavity connected to the drainage cavity. The fluid can flow through the drainage port, the drainage cavity, the liquid inlet cavity and the liquid inlet port in sequence.

[0010] As a preferred technical solution of the above-mentioned return joint, the above-mentioned core body includes a first connecting portion and a second connecting portion spaced apart along its axial direction, the above-mentioned first connecting portion is fixed to the above-mentioned shell, and the above-mentioned second connecting portion is used to connect to the above-mentioned interface of the above-mentioned hydraulic pump.

[0011] As a preferred technical solution of the above-mentioned return joint, the above-mentioned second connecting portion is connected to the above-mentioned hydraulic pump through a threaded connection.

[0012] As a preferred technical solution of the reflux joint, a avoidance hole is provided on the bottom wall of the shell, a screwing portion is provided on one side of the core body facing the avoidance hole, and the screwing portion is exposed outside the shell from the avoidance hole.

[0013] As a preferred technical solution of the reflux joint, a first sealing member is provided between the shell and the core body, and the first sealing member is located between the drainage cavity and the avoidance hole.

[0014] As a preferred technical solution for the above-mentioned return joint, the above-mentioned core body is provided with a first annular groove around its axial direction, and the above-mentioned first sealing member is a first sealing ring, and the above-mentioned first sealing ring is partially clamped in the above-mentioned first annular groove, and the other part fills the gap between the inner circumferential wall of the above-mentioned outer shell and the outer circumferential wall of the above-mentioned core body.

[0015] As a preferred technical solution of the above-mentioned reflux joint, the above-mentioned first connecting part is stepped, the small diameter section of the above-mentioned first connecting part can be inserted into the above-mentioned avoidance hole and threadedly connected to the above-mentioned outer shell, and the stepped surface of the above-mentioned first connecting part abuts against the above-mentioned bottom wall along the axis of the above-mentioned avoidance hole.

[0016] As a preferred technical solution of the above-mentioned return joint, the above-mentioned second connecting portion is stepped, and the small-diameter section of the above-mentioned second connecting portion forms an external thread for connecting to the above-mentioned hydraulic pump.

[0017] As a preferred technical solution of the return joint, a second sealing member is provided between the housing and the hydraulic pump.

[0018] As a preferred technical solution of the above-mentioned reflux joint, the above-mentioned liquid inlet cavity is opened in parallel with the above-mentioned liquid discharge cavity, and the side wall of the core body of the above-mentioned core body is provided with a through hole perpendicular to the axis of the above-mentioned liquid discharge cavity, and the above-mentioned through hole connects the above-mentioned liquid discharge cavity and the above-mentioned liquid inlet cavity.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a reflux joint, which is connected to an interface of a hydraulic pump for connecting with a filter, and the interface is provided with a liquid discharge port and a liquid inlet, and the liquid discharge port is formed in an annular shape on the outer peripheral side of the liquid inlet, and the reflux joint includes a shell and a core body. The shell includes a peripheral side wall and a bottom wall, the peripheral side wall is a closed annular structure, and the bottom wall is arranged at one end of the axial direction of the peripheral side wall; the core body is inserted into the shell and fixed relatively to the shell, and the outer peripheral wall of the core body and the inner peripheral wall of the shell are arranged to form a liquid discharge cavity, and the core body is provided with a liquid inlet cavity connected with the liquid discharge cavity, and the fluid can flow through the liquid discharge port, the liquid discharge cavity, the liquid inlet cavity and the liquid inlet in sequence.

[0021] Specifically, the interface of the hydraulic pump includes a first side wall and a second side wall, a liquid discharge port is formed between the first side wall and the second side wall, and the second side wall encloses a liquid inlet. The opening end face of the liquid inlet cavity can abut against the second side wall, so that the liquid inlet cavity of the return joint and the liquid inlet of the hydraulic pump are connected, and the axial end face of the housing can abut against the first side wall, so that the liquid discharge port of the hydraulic pump is connected to the liquid discharge cavity of the return joint, and in the return joint, the liquid discharge cavity and the liquid inlet cavity are connected, so that when the hydraulic pump is tested for air tightness, the return joint can be used instead of the filter, so that the fluid in the hydraulic pump can return to the hydraulic pump after passing through the return joint, eliminating the influence of the filter itself and / or the sealing between the filter and the hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the reflux joint provided in an embodiment of the utility model;

[0024] Figure 2 It is an exploded schematic diagram of a reflux joint provided in an embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the assembly of the return joint and the hydraulic pump provided in the embodiment of the utility model.

[0026] In the figure:

[0027] 100, hydraulic pump; 110, liquid discharge port; 120, liquid inlet; 130, first side wall; 140, second side wall;

[0028] 200, housing; 210, peripheral side wall; 211, second annular groove; 220, bottom wall; 221, avoidance hole;

[0029] 300, core; 310, first connecting portion; 311, first large diameter section; 312, first small diameter section; 313, first shaft shoulder; 320, second connecting portion; 321, second large diameter section; 322, second small diameter section; 323, second shaft shoulder; 330, screwing portion; 340, first annular groove; 350, through hole;

[0030] 410. Liquid discharge chamber; 420. Liquid inlet chamber. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figures 1 to 3As shown, the utility model provides a reflux joint, which is connected to the interface of the hydraulic pump 100 for connecting with the filter, and the interface is provided with a drain port 110 and a liquid inlet 120, and the drain port 110 is formed in an annular shape on the outer peripheral side of the liquid inlet 120, and the reflux joint includes a shell 200 and a core 300. Among them, the shell 200 includes a peripheral side wall 210 and a bottom wall 220, and the peripheral side wall 210 is a closed annular structure, and the bottom wall 220 is arranged at one end of the axial direction of the peripheral side wall 210; the core 300 is inserted into the shell 200 and fixed relatively to the shell 200, and the outer peripheral wall of the core 300 is spaced from the inner peripheral wall of the shell 200 to form a drain cavity 410, and the core 300 is provided with a liquid inlet cavity 420 connected with the drain cavity 410, and the fluid can flow through the drain port 110, the drain cavity 410, the liquid inlet cavity 420 and the liquid inlet 120 in sequence.

[0036] Specifically, the interface of the hydraulic pump 100 includes a first side wall 130 and a second side wall 140, a liquid discharge port 110 is formed between the first side wall 130 and the second side wall 140, and the second side wall 140 encloses a liquid inlet 120. The opening end surface of the liquid inlet cavity 420 can abut against the second side wall 140, so that the liquid inlet cavity 420 of the return joint and the liquid inlet 120 of the hydraulic pump 100 are communicated, and the axial end surface of the housing 200 can abut against the first side wall 130, so that the liquid discharge port 110 of the hydraulic pump 100 is communicated with the liquid discharge cavity 410 of the return joint, and in the return joint, the liquid discharge cavity 410 and the liquid inlet cavity 420 are communicated, so that when the hydraulic pump 100 is tested for air tightness, the return joint can be used instead of the filter, so that the fluid in the hydraulic pump 100 can return to the hydraulic pump 100 after passing through the return joint, eliminating the influence of the filter itself and / or the sealing between the filter and the hydraulic pump 100.

[0037] Optionally, the core 300 includes a first connection portion 310 and a second connection portion 320 spaced apart along the axial direction thereof, the first connection portion 310 is fixed to the housing 200 , and the second connection portion 320 is used to connect to an interface of the hydraulic pump 100 .

[0038] Optionally, the second connection part 320 is connected to the hydraulic pump 100 by threads. Specifically, the second connection part 320 is connected to the peripheral side wall 210 of the liquid inlet 120 by threads. When the hydraulic pump 100 is tested for air tightness, the fluid is pumped into the discharge cavity 410 from the discharge port 110 by the hydraulic pump 100. The fluid exerts a relatively large force on the core 300 and / or the housing 200, so that the return joint always has a tendency to separate from the interface along the discharge direction of the fluid. The threaded connection can withstand a relatively strong axial force so that the return joint can be stably fixed to the interface. The threaded connection has a certain sealing performance.

[0039] Optionally, the first connection part 310 is connected to the housing 200 by threads. Specifically, the first connection part 310 is located on the side of the core 300 close to the bottom wall 220 of the housing 200, the outer peripheral side of the first connection part 310 is provided with an external thread, and the inner peripheral wall of the housing 200 is provided with an internal thread on the side close to the bottom wall 220 thereof. The first connection part 310 is threadedly connected to the housing 200, and the threaded connection has an anti-retraction function. When the hydraulic pump 100 is tested for air tightness, the fluid is pressed into the discharge cavity 410 and then returns through the liquid inlet cavity 420. Since the discharge cavity 410 is formed by the housing 200 and the core 300, when the fluid fills the discharge cavity 410, the pressure in the discharge cavity 410 is relatively large, so that the housing 200 and the core 300 always have a tendency to move away from each other. Due to its own structural characteristics, the threaded connection can withstand a relatively large axial force to maintain the relative fixation of the housing 200 and the core 300.

[0040] In other embodiments, the second connection portion 320 and the hydraulic pump 100 and / or the first connection portion 310 and the housing 200 are fixed by interference fit.

[0041] Optionally, the bottom wall 220 of the shell 200 is provided with an avoidance hole 221, and the core 300 is provided with a screwing portion 330 on one side facing the avoidance hole 221, and the screwing portion 330 is exposed outside the shell 200 from the avoidance hole 221. In this way, the core 300 can be directly driven to rotate relative to the interface by rotating the screwing portion 330 through the avoidance hole 221, thereby reducing the relative rotation between the shell 200 and the core 300.

[0042] Specifically, in this embodiment, the screwing portion 330 is a hexagonal hole, and the axis of the hexagonal hole coincides with the axis of the second connecting portion 320. During the assembly process, the core body 300 and the outer shell 200 are assembled first, and then the staff uses a hexagonal wrench to plug and rotate the core body 300 with the hexagonal hole to install the core body 300 at the interface of the hydraulic pump 100.

[0043] In other embodiments, the screwing portion 330 protrudes from the axial end surface of the core body 300 , so that a worker can clamp the screwing portion 330 and drive the core body 300 to rotate relative to the interface by rotating the screwing portion 330 .

[0044] It should be noted that the screwing portion 330 cannot be a cylindrical structure whose axis coincides with the axis of the second connecting portion 320 and is disposed singly. The cylindrical structure here includes a cylindrical protrusion and a cylindrical groove.

[0045] Since the drainage cavity 410 is formed by the shell 200 and the core 300, and there is a gap between the shell 200 and the core 300, the fluid, under the action of pressure, easily enters the avoidance hole 221 along the gap, and the avoidance hole 221 is connected to the outside of the shell 200, that is, leakage occurs, affecting the air tightness test result, so a first seal is provided between the shell 200 and the core 300, and the first seal is located between the drainage cavity 410 and the avoidance hole 221. The gap between the drainage cavity 410 and the avoidance hole 221 is blocked by the first seal, so that the fluid can only enter the liquid inlet 120 from the drainage cavity 410 through the liquid inlet cavity 420.

[0046] Optionally, the core 300 is provided with a first annular groove 340 around its axial direction, and the first sealing member is a first sealing ring, a portion of the first sealing ring is clamped in the first annular groove 340, and the other portion fills the gap between the inner circumferential wall of the housing 200 and the outer circumferential wall of the core 300. The first annular groove 340 serves as a limiting groove of the first sealing ring, and can limit the relative movement of the first sealing ring relative to the core 300.

[0047] In other embodiments, the first annular groove 340 is formed on the inner wall of the housing 200 .

[0048] Optionally, the first connection part 310 is stepped, the small diameter section of the first connection part 310 can be inserted into the avoidance hole 221 and threadedly connected to the housing 200, and the stepped surface of the first connection part 310 abuts against the bottom wall 220 along the axis of the avoidance hole 221. Specifically, the first connection part 310 includes a first large diameter section 311, a first small diameter section 312, and a first shoulder 313 formed between the first large diameter section 311 and the first small diameter section 312. The outer peripheral wall of the first small diameter section 312 is provided with threads, and the inner peripheral wall of the avoidance hole 221 is also provided with threads. The first small diameter section 312 is threadedly connected to the housing 200 in the avoidance hole 221, and the first shoulder 313 can abut against the bottom wall 220 to preliminarily seal the avoidance hole 221 and the drainage cavity 410.

[0049] Preferably, the circumferential side of the first large-diameter section 311 can abut against the inner circumferential side of the housing 200 , and the first sealing member is disposed between the outer circumferential side of the first large-diameter section 311 and the housing 200 .

[0050] In other embodiments, the first sealing member is disposed between the first shoulder 313 and the bottom wall 220 of the housing 200 .

[0051] Optionally, the second connection portion 320 is stepped, and a small-diameter section of the second connection portion 320 forms an external thread for connecting to the hydraulic pump 100 .

[0052] The second connecting portion 320 is connected to the second side wall 140, and the second side wall 140 forms a stepped structure corresponding to the second connecting portion 320. The second connecting portion 320 includes a second small diameter section 322, a second large diameter section 321, and a second shoulder 323 formed between the second large diameter section 321 and the second small diameter section 322. The outer peripheral wall of the second small diameter section 322 forms an external thread, and the inner peripheral wall of the large diameter section of the second side wall 140 is provided with an internal thread. The second small diameter section 322 is threadedly connected to the large diameter section of the second side wall 140, and the second shoulder 323 abuts against the end surface of the large diameter section of the second side wall 140. The outer peripheral wall of the second large diameter section 321 remains flush with the outer peripheral wall of the second side wall 140, and the inner peripheral wall of the second small diameter section 322 remains flush with the inner peripheral wall of the small diameter section of the second side wall 140. In this way, the generation of turbulence of the fluid in the liquid inlet cavity 420 and the liquid discharge cavity 410 is reduced.

[0053] Optionally, a second seal is provided between the housing 200 and the hydraulic pump 100. Specifically, the axial end surface of the peripheral side wall 210 of the housing 200 facing away from the bottom wall 220 abuts against the first side wall 130, and a second seal is provided to prevent fluid leakage, and the second seal can isolate the communication between the drainage cavity 410 and the outside.

[0054] In this embodiment, the housing 200 is connected to the hydraulic pump 100 through the core 300, and the core 300 and the hydraulic pump 100 are connected by threads. In the process of screwing the core 300, after the second sealing ring contacts the first side wall 130, it is squeezed axially and rotates relative to the first side wall 130 around the axial direction, which easily causes the second sealing ring to rub relative to the core 300, affecting the sealing effect. To this end, a second annular groove 211 is provided around the axis of the end surface of the housing 200 that abuts against the hydraulic pump 100. The second sealing member is a second sealing ring, part of which is clamped in the second annular groove 211, and the other part can fill the gap between the housing 200 and the hydraulic pump 100.

[0055] Specifically, the liquid inlet cavity 420 is opened in parallel with the liquid discharge cavity 410 , and a through hole 350 perpendicular to the axis of the liquid discharge cavity 410 is opened on the side wall of the core body 300 , and the through hole 350 connects the liquid discharge cavity 410 and the liquid inlet cavity 420 .

[0056] Furthermore, the side wall of the core body 300 is provided with a plurality of through holes 350 , and the plurality of through holes 350 are evenly distributed around the axis of the liquid inlet cavity 420 , so that the fluid can enter the liquid inlet cavity 420 from the liquid discharge cavity 410 more evenly.

[0057] In other embodiments, the core 300 and the housing 200 are respectively connected to the interface of the hydraulic pump 100, so as to achieve that the core 300 and the housing 200 remain relatively fixed. In this embodiment, the core 300 can be a hollow cylindrical structure, that is, the liquid inlet cavity 420 penetrates the core 300 along the axial direction of the core 300, one end of the core 300 connected to the interface is the outlet of the liquid inlet cavity 420, and the other end is the inlet of the liquid inlet cavity 420, and the end of the housing 200 connected to the interface is the inlet of the liquid discharge cavity 410. The fluid is discharged from the liquid discharge port 110, flows along the liquid discharge cavity 410 until it collides with the bottom wall 220 and turns, and then enters the liquid inlet cavity 420 from the inlet of the liquid inlet cavity 420, and flows to the liquid inlet port 120.

[0058] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A reflux joint connected to an interface of a hydraulic pump (100) for connecting to a filter, wherein the interface is provided with a liquid discharge port (110) and a liquid inlet (120), wherein the liquid discharge port (110) is formed in an annular shape on the outer peripheral side of the liquid inlet (120), and wherein: The return joint comprises: A housing (200), the housing (200) comprising a peripheral side wall (210) and a bottom wall (220), the peripheral side wall (210) being a closed annular structure, and the bottom wall (220) being arranged at one axial end of the peripheral side wall (210); A core body (300), the core body (300) is inserted into the shell (200) and fixed relative to the shell (200), the outer peripheral wall of the core body (300) and the inner peripheral wall of the shell (200) are spaced apart to form a liquid discharge cavity (410), the core body (300) is provided with a liquid inlet cavity (420) connected to the liquid discharge cavity (410), and the fluid can flow through the liquid discharge port (110), the liquid discharge cavity (410), the liquid inlet cavity (420) and the liquid inlet port (120) in sequence.

2. The return joint according to claim 1, characterized in that: The core (300) comprises a first connecting portion (310) and a second connecting portion (320) which are spaced apart along the axial direction thereof, wherein the first connecting portion (310) is fixed to the housing (200), and the second connecting portion (320) is used to connect to the interface of the hydraulic pump (100).

3. The return joint according to claim 2, characterized in that: The second connection portion (320) is connected to the hydraulic pump (100) via threads.

4. The return joint according to claim 3, characterized in that: The bottom wall (220) of the shell (200) is provided with an avoidance hole (221), and the core (300) is provided with a screwing portion (330) on one side facing the avoidance hole (221), and the screwing portion (330) is exposed outside the shell (200) from the avoidance hole (221).

5. The return joint according to claim 4, characterized in that: A first sealing member is provided between the housing (200) and the core (300), and the first sealing member is located between the drainage cavity (410) and the avoidance hole (221).

6. The return joint according to claim 5, characterized in that: The core (300) is provided with a first annular groove (340) around its axial direction, and the first sealing member is a first sealing ring, a portion of which is clamped in the first annular groove (340), and the other portion fills the gap between the inner circumferential wall of the shell (200) and the outer circumferential wall of the core (300).

7. The return joint according to claim 4, characterized in that: The first connecting portion (310) is in a stepped shape, the small diameter section of the first connecting portion (310) can be inserted into the avoidance hole (221) and is threadedly connected to the housing (200), and the stepped surface of the first connecting portion (310) abuts against the bottom wall (220) along the axis of the avoidance hole (221).

8. The return joint according to claim 2, characterized in that: The second connecting portion (320) is in a stepped shape, and the small-diameter section of the second connecting portion (320) forms an external thread for connecting to the hydraulic pump (100).

9. The return joint according to claim 1, characterized in that: A second sealing member is provided between the housing (200) and the hydraulic pump (100).

10. The return joint according to any one of claims 1 to 9, characterized in that: The liquid inlet cavity (420) is opened in parallel with the liquid discharge cavity (410), and the side wall of the core body (300) of the core body (300) is provided with a through hole (350) perpendicular to the axis of the liquid discharge cavity (410), and the through hole (350) connects the liquid discharge cavity (410) and the liquid inlet cavity (420).

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