Pressure adjustment mechanism

Abstract

To provide a pressure adjustment mechanism which can easily adjust the pressure of multiple internal spaces being connected.SOLUTION: A pressure adjustment mechanism is provided in a pump that adjusts pressure of a plurality of internal spaces being connected by repeating expanding and contracting operations on a pump chamber. The pressure adjustment mechanism includes a pressure adjustment member with a pressure adjustment chamber in communication with the pump chamber formed on the inside. The pressure adjustment member is composed of a first member and a second member. A volume of the pressure adjustment chamber can be adjusted by positional adjustment, which adjusts a position of the second member with respect to the first member between a first limit position and a second limit position in a first direction. The pressure adjustment member includes an indicator which is covered in a first state in which the second member is in the first limit position when viewed in a second direction vertical to the first direction, and which is exposed in a second state in which the second member is in the second limit position. The indicator has marks that allow viewing of division positions of the indicator as divided into n equal parts in the first direction with n being a natural number of 2 or greater, when seen in the second direction.SELECTED DRAWING: Figure 5

Description

【Technical Field】 【0001】 The present disclosure relates to a pressure adjustment mechanism. 【Background Art】 【0002】 A pressure adjustment mechanism provided in a pump that adjusts the pressure in the internal spaces of a plurality of connection targets by repeating the expansion and contraction operations of a pump chamber is known (see, for example, Non-Patent Document 1). 【Prior Art Documents】 【Non-Patent Documents】 【0003】 【Non-Patent Document 1】 Druck PV211 - Pneumatic pressure and vacuum pump, GE Industrial Sensing 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the pressure adjustment mechanism as described above, a pressure adjustment member is provided that forms a pressure adjustment chamber communicating with the pump chamber inside. The pressure adjustment member consists of a first member and a second member. When it is configured such that the volume of the pressure adjustment chamber can be adjusted by position adjustment for adjusting the position of the second member with respect to the first member between a first limit position and a second limit position in a first direction, for calibration of pressure equipment, etc., the pressure in the internal spaces of a plurality of connection targets connected to the pump can be finely adjusted by adjusting the volume of the pressure adjustment chamber. However, if it is difficult to know when the second member reaches the first limit position or the second limit position, there is a possibility that the second member reaches the first limit position or the second limit position during fine adjustment, resulting in the trouble of readjusting the pressure adjustment by the expansion and contraction operation of the pump chamber. 【0005】 Therefore, an object of the present disclosure is to provide a pressure adjustment mechanism that can easily adjust the pressure in the internal spaces of a plurality of connection targets. 【Means for Solving the Problems】 【0006】 One aspect of this disclosure is as follows: 【0007】 [1] A pressure adjustment mechanism provided in a pump that adjusts the pressure in the internal space of multiple connected objects by repeatedly expanding and contracting the pump chamber, It has a pressure regulating member that forms a pressure regulating chamber on its inside, which communicates with the pump chamber, The pressure regulating member comprises a first member and a second member, and the volume of the pressure regulating chamber can be adjusted by adjusting the position of the second member relative to the first member in a first direction between a first limit position and a second limit position. The pressure adjusting member has a display portion that, when viewed in a second direction perpendicular to the first direction, is covered when the second member is in the first limit position in a first state, and is exposed when the second member is in the second limit position in a second state. The display unit is a pressure adjustment mechanism in which n is a natural number of 2 or more, and each division position when the display unit is divided into n equal parts in the first direction is marked so that it can be seen when viewed in the second direction. 【0008】 [2] The pressure adjustment mechanism according to [1], wherein the markings enable each of the demarcation positions to be recognized by shape when viewed in the second direction. 【0009】 [3] The aforementioned marker has a shape marker for each of the aforementioned dividing positions, Each shaped marker is a groove or step extending along the demarcation position, as described in [2], for the pressure adjustment mechanism. 【0010】 [4] The pressure adjustment mechanism according to any one of [1] to [3], wherein the second member is connected to the first member via a screw joint so as to be movable in the first direction. 【0011】 [5] The first member has a cylinder portion, The outer peripheral surface of the cylinder portion has the display portion. The second member includes a piston member that can move in the first direction with respect to the cylinder portion, and a sleeve member that is integrally connected to the piston member, covers the display portion in the first state, and exposes the display portion in the second state. The pressure adjustment mechanism according to any one of [1] to [4]. 【0012】 [6] The pressure adjustment mechanism according to any one of [1] to [5], A pump having a hand grip that repeats the expansion and contraction operations of the pump chamber by repeatedly receiving a squeezing operation against the repulsive force. 【Effect of the Invention】 【0013】 According to the present disclosure, a pressure adjustment mechanism capable of easily adjusting the pressures in the internal spaces of a plurality of connection targets can be provided. 【Brief Description of the Drawings】 【0014】 [Figure 1] It is an external view showing a pump according to an embodiment. [Figure 2] It is a cross-sectional view showing the first state of the pressure adjustment mechanism shown in FIG. 1. [Figure 3] It is a cross-sectional view showing the second state of the pressure adjustment mechanism shown in FIG. 1. [Figure 4] It is an external view showing the first state of the pressure adjustment mechanism shown in FIG. 1. [Figure 5] It is an external view showing the second state of the pressure adjustment mechanism shown in FIG. 1. [Figure 6] [[ID=4°]]It is a partial cross-sectional external view showing the pump chamber and the hand grip of the pump shown in FIG. 1. <o000088>【Mode for Carrying Out the Invention】 【0015】 Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. 【0016】 As shown in FIGS. 1 to 5, a pressure adjustment mechanism 1a according to an embodiment is a pressure adjustment mechanism 1a (see FIGS. 2 to 5) provided in a pump 1 that adjusts the pressure in the internal spaces of a plurality of connection targets (not shown) by repeating the expansion and contraction operations of a pump chamber 2 (see FIG. 6). The pressure adjustment mechanism 1a has a pressure adjustment member 4 that forms a pressure adjustment chamber 3 communicating with the pump chamber 2 inside. The pressure adjustment member 4 is composed of a first member 4a and a second member 4b. The volume of the pressure adjustment chamber 3 can be adjusted by adjusting the position of the second member 4b relative to the first member 4a in a first direction D1 between a first limit position (see FIGS. 2 and 4) and a second limit position (see FIGS. 3 and 5). When viewed in a second direction D2 perpendicular to the first direction D1, the pressure adjustment member 4 has a display portion 5 (see FIG. 4) that is covered in a first state where the second member 4b is in the first limit position and is exposed in a second state where the second member 4b is in the second limit position. The display portion 5 has marks 6 that enable the respective division positions 5a when the display portion 5 is divided into n equal parts in the first direction D1 to be visually recognized when viewed in the second direction D2, where n is a natural number of 2 or more. 【0017】 According to the above configuration, when finely adjusting the pressure in the internal spaces of a plurality of connection targets connected to the pump 1 for calibration of pressure equipment or the like by adjusting the volume of the pressure adjustment chamber 3, it is possible to easily know when the second member 4b reaches the first limit position or the second limit position by looking at the marks 6 on the display portion 5. That is, by knowing in advance that the marks 6 divide the display portion 5 into n equal parts, the user can easily know when the second member 4b reaches the first limit position or the second limit position. Therefore, it is possible to reduce the possibility that the second member 4b reaches the first limit position or the second limit position during the fine adjustment, resulting in the need to redo the pressure adjustment by the expansion and contraction operation of the pump chamber 2. Therefore, according to the above configuration, it is possible to realize a pressure adjustment mechanism 1a that can easily adjust the pressure in the internal spaces of a plurality of connection targets. 【0018】 The marker 6 allows each demarcation position 5a to be recognized by its shape when viewed in the second direction D2. With the above configuration, the marker 6 can be realized with a simple structure. Alternatively, the marker 6 may be configured so that each demarcation position 5a can be recognized by its color when viewed in the second direction D2. 【0019】 The marker 6 has a shape marker 6a at each dividing position 5a, and each shape marker 6a consists of a groove or step extending along the dividing position 5a. With the above configuration, the marker 6 can be realized with a particularly simple structure. 【0020】 n is 3. That is, the distance W1 from one end of the display unit 5 to the first dividing position 5a is 1 / 3 of the distance W3 from one end of the display unit 5 to the other end, and the distance W2 from one end of the display unit 5 to the second dividing position 5a is 2 / 3 of the distance W3 from one end of the display unit 5 to the other end. With the above configuration, the marker 6 can be realized with a particularly simple structure. Note that n is not limited to 3, but may be 2 or a natural number of 4 or more. However, from the viewpoint of visibility, it is preferable that n is 3 or 4. 【0021】 The morphological marker 6a for the first dividing position 5a consists of a step extending along the dividing position 5a, and the morphological marker 6a for the second dividing position 5a consists of a groove extending along the dividing position 5a. With the above configuration, the marker 6 can be realized with a simple structure. 【0022】 The second member 4b is connected to the first member 4a via a threaded joint 7 so that it can move in a first direction D1. With this configuration, by rotating the second member 4b to one side relative to the first member 4a around the central axis O of the threaded joint 7 that extends along the first direction D1, the second member 4b can be moved to one side of the first direction D1 relative to the first member 4a, and by rotating the second member 4b to the other side relative to the first member 4a, the second member 4b can be moved to the other side of the first direction D1 relative to the first member 4a. In other words, relative to the first member 4a, the second member 4b can be moved forward or backward in the first direction D1 depending on the direction of rotation of the second member 4b. Therefore, with this configuration, high-precision pressure adjustment can be achieved with simple operation. 【0023】 The first member 4a has a cylinder portion 8, and the outer circumferential surface of the cylinder portion 8 has a display portion 5. The second member 4b has a piston member 9 that can move in a first direction D1 relative to the cylinder portion 8, and a sleeve member 10 that is integrally connected to the piston member 9 and covers the display portion 5 in the first state and exposes the display portion 5 in the second state. With the above configuration, a pressure adjustment chamber 3 can be formed by the inner surface of the cylinder portion 8 and the piston member 9, and the display portion 5 can be formed on the outer circumferential surface of the cylinder portion 8 by the portion that is covered by the sleeve member 10 in the first state and exposed in the second state. Therefore, with the above configuration, a pressure adjustment chamber 3 and a display portion 5 can be realized with a simple structure. 【0024】 The cylinder section 8 comprises a cylinder circumferential wall 8a, a cylinder base 8b connected to one end of the cylinder circumferential wall 8a, and an annular wall 8c connected to the other end of the cylinder circumferential wall 8a. The outer circumferential surface of the cylinder circumferential wall 8a has a display section 5, the cylinder base 8b has an internal flow path 11 extending from the pressure adjustment chamber 3 toward the pump chamber 2, and the inner circumferential surface of the annular wall 8c is connected to the outer circumferential surface of the piston member 9 via a screw joint 7. With the above configuration, the cylinder section 8 can be realized with a simple structure. 【0025】 The sleeve member 10 has a sleeve peripheral wall 10a and a connecting wall 10b that integrally connects the sleeve peripheral wall 10a to the piston member 9. In the first state, the sleeve peripheral wall 10a covers the display unit 5, and in the second state, it exposes the display unit 5. With the above configuration, the sleeve member 10 can be realized with a simple structure. 【0026】 The volume of the pressure adjustment chamber 3 is minimized in the first state, when the display unit 5 is covered, and maximized in the second state, when the display unit 5 is exposed. With the above configuration, the pressure adjustment chamber 3 and the display unit 5 can be realized with a simple structure. 【0027】 Pump 1 includes a pressure adjustment mechanism 1a and a handgrip 1b that repeatedly expands and contracts the pump chamber 2 by receiving repeated gripping operations that resist repulsive forces. With this configuration, the pump chamber 2 expands and contracts repeatedly by repeatedly gripping the handgrip 1b, and as a result, the pressure in the internal spaces of multiple connected objects can be roughly adjusted. Subsequently, by fine-tuning the pressure with the pressure adjustment mechanism 1a, the pressure in the internal spaces of multiple connected objects can be adjusted with high precision. Therefore, with this configuration, a handgrip 1b type pump 1 that can easily adjust the pressure in the internal spaces of multiple connected objects can be realized. 【0028】 Pump 1 has a pump chamber forming section 1c that forms a pump chamber 2, the pump chamber forming section 1c has a pump cylinder section 12 and a pump piston section 13, the pump chamber 2 is formed by the inner surface of the pump cylinder section 12 and the pump piston section 13, and handgrip 1b has a grip 14 that can move from an initial state to a retracted state when gripped, a biasing section 15 that generates a biasing force to move the grip 14 from the retracted state to the initial state, and a link section 16 that causes the pump piston section 13 to reciprocate relative to the pump cylinder section 12 in accordance with the contraction and expansion movement of the grip 14 between the initial state and the retracted state. With the above configuration, by repeatedly gripping the grip 14, the pump piston section 13 is repeatedly moved back and forth relative to the pump cylinder section 12 via the link section 16, thereby repeatedly expanding and contracting the pump chamber 2. 【0029】 Pump 1 has a vent mechanism 1d which includes an opening channel 17 that can open the internal spaces of multiple connected objects to the atmosphere, and an opening / closing unit 18 that can open and close the opening channel 17. With the above configuration, by opening the opening channel 17 with the opening / closing unit 18 as needed, the internal spaces of multiple connected objects can be opened to the atmosphere via the opening channel 17, and the pressure of the internal spaces can be brought closer to atmospheric pressure. 【0030】 The open channel 17 extends through the piston member 9 of the second member 4b. With the above configuration, the vent mechanism 1d can be realized with a simple structure. 【0031】 The opening / closing section 18 includes a needle valve 18a screw-connected to the inner surface of the piston member 9 within the open passage 17, and an operating section 18b integrally provided with the needle valve 18a and capable of receiving rotational operation to advance or retract the needle valve 18a relative to the open passage 17. With the above configuration, the opening / closing section 18 can be realized with a simple structure. 【0032】 Pump 1 has a flow path switching mechanism 1e that can switch between a pressurizing mode and a depressurizing mode. In pressurizing mode, the flow path switching mechanism 1e allows air to flow into the pump chamber 2 when the pump chamber 2 expands, and suppresses air from flowing out of the pump chamber 2 into the atmosphere when the pump chamber 2 contracts. In depressurizing mode, the flow path switching mechanism 1e suppresses air to flow into the pump chamber 2 when the pump chamber 2 expands, and allows air to flow out of the pump chamber 2 into the atmosphere when the pump chamber 2 contracts. With the above configuration, a pump 1 that can be used in pressurizing mode or depressurizing mode as needed can be realized. The flow path switching mechanism 1e can employ, for example, a structure such as that described in Japanese Patent Application Publication No. 2022-73331. 【0033】 This disclosure is not limited to the embodiments described above and can be modified in various ways without departing from its essence. [Explanation of Symbols] 【0034】 1 pump 1a Pressure adjustment mechanism 1b Hand Grip 1c Pump chamber forming section 1d Vent mechanism 1e Flow path switching mechanism 2 Pump Room 3. Pressure adjustment chamber 4. Pressure regulating member 4a First Member 4b Second member 5 Display section 5a Separation point 6 Landmarks 6a Shape Markers 7. Threaded joint 8 Cylinder section 8a Cylinder peripheral wall 8b Cylinder base 8c Ring Wall 9 Piston member 10 Sleeve component 10a Sleeve perimeter 10b Connecting wall 11 Internal flow channels 12 Pump Cylinder Section 13 Pump piston section 14 Grips 15. Encouraging part 16 Link section 17 Open channel 18 Opening / Closing Section 18a Needle valve 18b Operation section D1 1st direction D2 2nd direction O center axis W1 Distance from one end of the display unit to the first dividing point W2 Distance from one end of the display section to the second dividing point W3 Distance from one end to the other of the display unit

Claims

[Claim 1] A pressure adjustment mechanism provided in a pump that adjusts the pressure in the internal space of multiple connected objects by repeatedly expanding and contracting the pump chamber, It has a pressure regulating member that forms a pressure regulating chamber on its inside, which communicates with the pump chamber, The pressure regulating member comprises a first member and a second member, and the volume of the pressure regulating chamber can be adjusted by adjusting the position of the second member relative to the first member in a first direction between a first limit position and a second limit position. The pressure adjusting member has a display portion that, when viewed in a second direction perpendicular to the first direction, is covered when the second member is in the first limit position in a first state, and is exposed when the second member is in the second limit position in a second state. The display unit has markings such that when the display unit is divided into n equal parts in the first direction, each division position is visible when viewed in the second direction, and n is a natural number of 2 or more. The first member has a cylinder portion, The outer surface of the cylinder portion has the display portion, The second member includes a piston member that can move in the first direction relative to the cylinder portion, and a sleeve member that is integrally connected to the piston member, covers the display portion in the first state, and exposes the display portion in the second state. Pressure regulating mechanism. [Claim 2] The pressure adjustment mechanism according to claim 1, wherein the markers enable each of the demarcation positions to be recognized by their shape when viewed in the second direction. [Claim 3] The aforementioned marker has a shape marker for each of the aforementioned dividing positions, The pressure adjustment mechanism according to claim 2, wherein each shaped marker consists of a groove or step extending along the demarcation position. [Claim 4] The pressure adjustment mechanism according to claim 1, wherein the second member is connected to the first member via a screw joint so as to be movable in the first direction. [Claim 5] A pressure adjustment mechanism according to any one of claims 1 to 4, A pump having a handgrip that causes the pump chamber to repeatedly expand and contract by receiving repeated gripping operations that resist the repulsive force.

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