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JP-7857507-B1 - Automatic stop device and siphon-type liquid transfer pump with automatic stop device

JP7857507B1JP 7857507 B1JP7857507 B1JP 7857507B1JP-7857507-B1

Abstract

[Problem] To provide an automatic stop device that simplifies the structure, improves the responsiveness and reliability of stopping liquid delivery, and can quickly stop liquid delivery even in emergencies, and a siphon-type liquid delivery pump equipped with an automatic stop device. [Solution] The device includes a float 212 that detects the liquid level in the container to which the liquid is being delivered, and a storage section 213 that houses the float and holds air. A communication hole 214 is opened in the upper part of the storage section, and the held air is sent to the discharge valve 14 of the pump 1 via an air inlet tube 215. A slide valve 211 that operates in response to the rise of the float connects the upper part of the storage section and the air inlet tube via the communication hole when the float rises to a predetermined position. As a result, the discharge valve is closed by the air sent out, the liquid flow in the discharge hose 15 is restricted, and the liquid delivery of the siphon-type liquid delivery pump is stopped. This provides an automatic stop device 2 and a siphon-type liquid delivery pump having an automatic stop device. [Selection Diagram] Figure 1

Inventors

  • 鹿糠 安正

Assignees

  • 鹿糠 わか子

Dates

Publication Date
20260512
Application Date
20260105

Claims (11)

  1. A float is positioned on the discharge port side of the discharge hose of a siphon-type liquid transfer pump, and in the container to which the liquid is being transferred, it rises as the liquid level increases, thereby detecting the liquid level. A storage section that houses the float, has an opening at the bottom that allows the liquid to enter as the liquid level rises, holds air above the float, and guides the float in the direction of buoyancy, Inside the aforementioned storage compartment, a slide valve is positioned above the float in the direction of its upward movement and operates in accordance with the float's upward movement. The cavity formed in the slide valve, The aforementioned storage section includes a support portion for the slide valve having a guide hole for guiding the operation of the slide valve, The support portion has a communication hole that connects the guide hole and the outside of the storage portion, It has an air inlet tube, one end of which is connected to the communication hole, and the other end of which is installed inside the discharge hose at a position facing the discharge valve interposed between the discharge hose and the operating cylinder of the siphon-type liquid transfer pump, An automatic stop device that closes the communication hole and shuts the valve in the portion of the slide valve where the cavity is not formed in the state before the float rises, the slide valve is fitted through a guide hole that penetrates from the upper surface on the support side of the housing portion through the communication hole, operates along the guide hole in response to the float rising, moves so as to protrude directly upward from the upper surface, opens the valve when the cavity overlaps the communication hole, and shuts the discharge valve by sending air held on the upper side of the housing portion from the other end of the air inlet tube, thereby restricting the liquid flow in the discharge hose and stopping the liquid supply of the siphon type liquid transfer pump.
  2. The automatic stop device according to claim 1, wherein the slide valve is formed from a plate-like body, and the cavity is formed by slit-like perforations in the longitudinal direction of the plate-like body.
  3. The automatic stop device according to claim 1, wherein the communication hole is formed as a through-hole that penetrates the support portion transversely in the short direction of the storage portion and reaches the air inlet tube.
  4. The automatic stop device according to claim 1, wherein the storage compartment has a seating portion for the float on its bottom surface that allows the liquid to enter.
  5. The automatic stop device according to claim 1, wherein the float is positioned at a distance directly below the slide valve, or is fixedly connected directly below the slide valve.
  6. The automatic stop device according to claim 1, wherein the float is connected to the slide valve via a linear member.
  7. The automatic stop device according to claim 1, wherein the air inlet tube has an L-shaped hook protruding from its other end, and the hook is engaged with a concave locking hole formed on the inner wall surface of the discharge hose.
  8. The automatic stop device according to claim 1, wherein the air inlet tube is inserted into the internal space of the discharge hose.
  9. The automatic stop device according to claim 1, wherein the air inlet tube is routed parallel to the discharge hose and its other end is airtightly inserted into the internal space from the discharge hose before the discharge valve.
  10. The automatic stop device according to claim 1, wherein the air inlet tube extends from the internal space of the discharge hose, airtightly through the partition wall where the discharge valve of the siphon-type liquid transfer pump is provided, avoiding the discharge valve, and extends into the internal space of the operating cylinder.
  11. A siphon-type liquid transfer pump having an automatic stop device according to any one of claims 1 to 10 .

Description

The disclosures herein relate to an automatic shut-off device and a siphon-type liquid transfer pump having an automatic shut-off device. Conventionally, siphon-type liquid transfer pumps, which utilize the siphon action, are widely known as devices for transferring liquids such as kerosene into containers (typically referred to as fuel pumps or kerosene pumps). In this type of pump, an automatic stop mechanism has been proposed that automatically stops the liquid transfer when a predetermined amount is reached, by releasing the siphon action based on the movement of a float. For example, a configuration is known in which the siphon action is released by opening an air vent hole or air release cap as the float rises, and introducing air into the air inlet tube (see, for example, Patent Documents 1 and 2). These conventional technologies employ a configuration in which an air inlet tube is connected to an air vent located above the pump section, and the siphon effect is released by opening and closing this air vent. Japanese Utility Model Publication No. 61-41900Japanese Utility Model Publication No. 3-77100, etc. Figure 1 is a side cross-section of a siphon-type liquid transfer pump with an automatic stop device built in.Figure 2 is a schematic top view of the installation configuration of the slide valve of the automatic stop device.Figure 3 is a schematic side view of the installation configuration of the slide valve of the automatic stop device.Figure 4 is a schematic side view (modified example) of the installation configuration of the slide valve of the automatic stop device.Figure 5 is a schematic side view of the float installation configuration.Figure 6 is a schematic diagram showing a partially enlarged view of the attachment point of the air inlet tube.Figure 7 is a schematic diagram showing the closed state of the slide valve.Figure 8 is a schematic diagram showing the open state of the slide valve.Figure 9 is a side view of a siphon-type liquid transfer pump with an automatic stop device attached to its exterior.Figure 10 is a side view of a siphon-type liquid transfer pump with an extended air inlet tube of a slide valve enclosed with an automatic stop device. The following describes embodiments for implementing the disclosures herein, with reference to the drawings. Where subsequent embodiments have components corresponding to previously described embodiments, the same reference numerals are used, and redundant explanations are omitted. Furthermore, when only a portion of a configuration is described in each embodiment, the reference numerals of the previously described embodiment may be used for other parts of that configuration. Even if specific combinations are not explicitly stated in each embodiment, partial combinations of embodiments are possible as long as there are no particular obstacles to such combinations. Also, the sizes of each member and component in the figures are exaggerated as appropriate for ease of explanation and do not represent actual dimensions or ratios between members and components. <First Embodiment> <Structure of a siphon-type liquid transfer pump> Figure 1 is a side cross-section of a siphon-type liquid transfer pump 1 incorporating the automatic stop device 2 disclosed herein. The siphon-type liquid transfer pump 1 has a suction mechanism and a discharge mechanism via a manually operable cylinder 13. The suction mechanism has a suction valve 12 that opens and closes in accordance with the operation of the cylinder 13, such as a kerosene tank, and a suction pipe 11 that is inserted into the container that supplies the liquid, such as a stove cartridge tank. On the other hand, the discharge mechanism has a discharge valve 14 that opens and closes in accordance with the operation of the cylinder 13, and a discharge hose 15 that is inserted into the container to which the liquid is supplied. Hereinafter, in this specification, kerosene will be used as an example to describe the liquid to be transferred. The intake pipe 11 is inserted into the kerosene tank (not shown) so that its intake port is well below the liquid level. In the initial stage immediately after inserting the intake pipe 11 into the kerosene tank (priming process), since there is no kerosene in the operating cylinder 13, pushing the operating cylinder 13 will only open the discharge valve 14, and no kerosene will be discharged, resulting in a so-called dry-running state. Subsequently, returning the actuator 13 to its original position creates negative pressure within the actuator 13, causing the intake valve 12 to open and drawing kerosene from the intake pipe 11 into the actuator 13. Next, manually pushing the actuator 13 in reduces its volume, creating positive pressure within the actuator 13. This positive pressure closes the intake valve 12 and opens the discharge valve 14, discharging kerosene from the actuator 13 to the discharge hose 15. Returning the actuator 13 to its original position incr